glib/docs/reference/gobject/html/gobject-Signals.html - nest-cam/4320010/glib - Git at Google

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 <h2><span class="refentrytitle"><a name="gobject-Signals.top_of_page"></a>Signals</span></h2>
 <p>Signals — A means for customization of object behaviour
     and a general purpose notification mechanism</p>
 </td>
 <td class="gallery_image" valign="top" align="right"></td>
 </tr></table></div>
 <div class="refsect1">
 <a name="gobject-Signals.functions"></a><h2>Functions</h2>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="functions_return">
 <col class="functions_name">
 </colgroup>
 <tbody>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <span class="c_punctuation">(</span><a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()">*GSignalAccumulator</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <span class="c_punctuation">(</span><a class="link" href="gobject-Signals.html#GSignalEmissionHook" title="GSignalEmissionHook ()">*GSignalEmissionHook</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-new" title="g_signal_new ()">g_signal_new</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-newv" title="g_signal_newv ()">g_signal_newv</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-new-valist" title="g_signal_new_valist ()">g_signal_new_valist</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-set-va-marshaller" title="g_signal_set_va_marshaller ()">g_signal_set_va_marshaller</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-query" title="g_signal_query ()">g_signal_query</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-lookup" title="g_signal_lookup ()">g_signal_lookup</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">const <a href="../glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-name" title="g_signal_name ()">g_signal_name</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-list-ids" title="g_signal_list_ids ()">g_signal_list_ids</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-emit" title="g_signal_emit ()">g_signal_emit</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-emit-by-name" title="g_signal_emit_by_name ()">g_signal_emit_by_name</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-emitv" title="g_signal_emitv ()">g_signal_emitv</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-emit-valist" title="g_signal_emit_valist ()">g_signal_emit_valist</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-connect" title="g_signal_connect()">g_signal_connect</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-connect-after" title="g_signal_connect_after()">g_signal_connect_after</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-connect-swapped" title="g_signal_connect_swapped()">g_signal_connect_swapped</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-connect-object" title="g_signal_connect_object ()">g_signal_connect_object</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-connect-data" title="g_signal_connect_data ()">g_signal_connect_data</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-connect-closure" title="g_signal_connect_closure ()">g_signal_connect_closure</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-connect-closure-by-id" title="g_signal_connect_closure_by_id ()">g_signal_connect_closure_by_id</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-handler-block" title="g_signal_handler_block ()">g_signal_handler_block</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-handler-unblock" title="g_signal_handler_unblock ()">g_signal_handler_unblock</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-handler-disconnect" title="g_signal_handler_disconnect ()">g_signal_handler_disconnect</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-handler-find" title="g_signal_handler_find ()">g_signal_handler_find</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-handlers-block-matched" title="g_signal_handlers_block_matched ()">g_signal_handlers_block_matched</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-handlers-unblock-matched" title="g_signal_handlers_unblock_matched ()">g_signal_handlers_unblock_matched</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-handlers-disconnect-matched" title="g_signal_handlers_disconnect_matched ()">g_signal_handlers_disconnect_matched</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-handler-is-connected" title="g_signal_handler_is_connected ()">g_signal_handler_is_connected</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-handlers-block-by-func" title="g_signal_handlers_block_by_func()">g_signal_handlers_block_by_func</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-handlers-unblock-by-func" title="g_signal_handlers_unblock_by_func()">g_signal_handlers_unblock_by_func</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-handlers-disconnect-by-func" title="g_signal_handlers_disconnect_by_func()">g_signal_handlers_disconnect_by_func</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-handlers-disconnect-by-data" title="g_signal_handlers_disconnect_by_data()">g_signal_handlers_disconnect_by_data</a><span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-has-handler-pending" title="g_signal_has_handler_pending ()">g_signal_has_handler_pending</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-stop-emission" title="g_signal_stop_emission ()">g_signal_stop_emission</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-stop-emission-by-name" title="g_signal_stop_emission_by_name ()">g_signal_stop_emission_by_name</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-override-class-closure" title="g_signal_override_class_closure ()">g_signal_override_class_closure</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-chain-from-overridden" title="g_signal_chain_from_overridden ()">g_signal_chain_from_overridden</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-new-class-handler" title="g_signal_new_class_handler ()">g_signal_new_class_handler</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-override-class-handler" title="g_signal_override_class_handler ()">g_signal_override_class_handler</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-chain-from-overridden-handler" title="g_signal_chain_from_overridden_handler ()">g_signal_chain_from_overridden_handler</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-add-emission-hook" title="g_signal_add_emission_hook ()">g_signal_add_emission_hook</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <span class="returnvalue">void</span>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-remove-emission-hook" title="g_signal_remove_emission_hook ()">g_signal_remove_emission_hook</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-parse-name" title="g_signal_parse_name ()">g_signal_parse_name</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="gobject-Signals.html#GSignalInvocationHint" title="struct GSignalInvocationHint"><span class="returnvalue">GSignalInvocationHint</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-get-invocation-hint" title="g_signal_get_invocation_hint ()">g_signal_get_invocation_hint</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a class="link" href="gobject-Closures.html#GClosure" title="struct GClosure"><span class="returnvalue">GClosure</span></a> *
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-type-cclosure-new" title="g_signal_type_cclosure_new ()">g_signal_type_cclosure_new</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-accumulator-first-wins" title="g_signal_accumulator_first_wins ()">g_signal_accumulator_first_wins</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 <tr>
 <td class="function_type">
 <a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 </td>
 <td class="function_name">
 <a class="link" href="gobject-Signals.html#g-signal-accumulator-true-handled" title="g_signal_accumulator_true_handled ()">g_signal_accumulator_true_handled</a> <span class="c_punctuation">()</span>
 </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect1">
 <a name="gobject-Signals.other"></a><h2>Types and Values</h2>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="name">
 <col class="description">
 </colgroup>
 <tbody>
 <tr>
 <td class="datatype_keyword">struct</td>
 <td class="function_name"><a class="link" href="gobject-Signals.html#GSignalInvocationHint" title="struct GSignalInvocationHint">GSignalInvocationHint</a></td>
 </tr>
 <tr>
 <td class="typedef_keyword">typedef</td>
 <td class="function_name"><a class="link" href="gobject-Signals.html#GSignalCMarshaller" title="GSignalCMarshaller">GSignalCMarshaller</a></td>
 </tr>
 <tr>
 <td class="typedef_keyword">typedef</td>
 <td class="function_name"><a class="link" href="gobject-Signals.html#GSignalCVaMarshaller" title="GSignalCVaMarshaller">GSignalCVaMarshaller</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">enum</td>
 <td class="function_name"><a class="link" href="gobject-Signals.html#GSignalFlags" title="enum GSignalFlags">GSignalFlags</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">enum</td>
 <td class="function_name"><a class="link" href="gobject-Signals.html#GSignalMatchType" title="enum GSignalMatchType">GSignalMatchType</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">struct</td>
 <td class="function_name"><a class="link" href="gobject-Signals.html#GSignalQuery" title="struct GSignalQuery">GSignalQuery</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="gobject-Signals.html#G-SIGNAL-TYPE-STATIC-SCOPE:CAPS" title="G_SIGNAL_TYPE_STATIC_SCOPE">G_SIGNAL_TYPE_STATIC_SCOPE</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="gobject-Signals.html#G-SIGNAL-MATCH-MASK:CAPS" title="G_SIGNAL_MATCH_MASK">G_SIGNAL_MATCH_MASK</a></td>
 </tr>
 <tr>
 <td class="define_keyword">#define</td>
 <td class="function_name"><a class="link" href="gobject-Signals.html#G-SIGNAL-FLAGS-MASK:CAPS" title="G_SIGNAL_FLAGS_MASK">G_SIGNAL_FLAGS_MASK</a></td>
 </tr>
 <tr>
 <td class="datatype_keyword">enum</td>
 <td class="function_name"><a class="link" href="gobject-Signals.html#GConnectFlags" title="enum GConnectFlags">GConnectFlags</a></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect1">
 <a name="gobject-Signals.includes"></a><h2>Includes</h2>
 <pre class="synopsis">#include &lt;glib-object.h&gt;
 </pre>
 </div>
 <div class="refsect1">
 <a name="gobject-Signals.description"></a><h2>Description</h2>
 <p>The basic concept of the signal system is that of the emission
 of a signal. Signals are introduced per-type and are identified
 through strings. Signals introduced for a parent type are available
 in derived types as well, so basically they are a per-type facility
 that is inherited.</p>
 <p>A signal emission mainly involves invocation of a certain set of
 callbacks in precisely defined manner. There are two main categories
 of such callbacks, per-object ones and user provided ones.
 (Although signals can deal with any kind of instantiatable type, I'm
 referring to those types as "object types" in the following, simply
 because that is the context most users will encounter signals in.)
 The per-object callbacks are most often referred to as "object method
 handler" or "default (signal) handler", while user provided callbacks are
 usually just called "signal handler".</p>
 <p>The object method handler is provided at signal creation time (this most
 frequently happens at the end of an object class' creation), while user
 provided handlers are frequently connected and disconnected to/from a
 certain signal on certain object instances.</p>
 <p>A signal emission consists of five stages, unless prematurely stopped:</p>
 <div class="orderedlist"><ol class="orderedlist" type="1">
 <li class="listitem"><p>Invocation of the object method handler for <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS"><code class="literal">G_SIGNAL_RUN_FIRST</code></a> signals</p></li>
 <li class="listitem"><p>Invocation of normal user-provided signal handlers (where the <em class="parameter"><code>after</code></em>

 flag is not set)</p></li>
 <li class="listitem"><p>Invocation of the object method handler for <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">G_SIGNAL_RUN_LAST</code></a> signals</p></li>
 <li class="listitem"><p>Invocation of user provided signal handlers (where the <em class="parameter"><code>after</code></em>
  flag is set)</p></li>
 <li class="listitem"><p>Invocation of the object method handler for <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-CLEANUP:CAPS"><code class="literal">G_SIGNAL_RUN_CLEANUP</code></a> signals</p></li>
 </ol></div>
 <p>The user-provided signal handlers are called in the order they were
 connected in.</p>
 <p>All handlers may prematurely stop a signal emission, and any number of
 handlers may be connected, disconnected, blocked or unblocked during
 a signal emission.</p>
 <p>There are certain criteria for skipping user handlers in stages 2 and 4
 of a signal emission.</p>
 <p>First, user handlers may be blocked. Blocked handlers are omitted during
 callback invocation, to return from the blocked state, a handler has to
 get unblocked exactly the same amount of times it has been blocked before.</p>
 <p>Second, upon emission of a <a class="link" href="gobject-Signals.html#G-SIGNAL-DETAILED:CAPS"><code class="literal">G_SIGNAL_DETAILED</code></a> signal, an additional
 <em class="parameter"><code>detail</code></em>
  argument passed in to <a class="link" href="gobject-Signals.html#g-signal-emit" title="g_signal_emit ()"><code class="function">g_signal_emit()</code></a> has to match the detail
 argument of the signal handler currently subject to invocation.
 Specification of no detail argument for signal handlers (omission of the
 detail part of the signal specification upon connection) serves as a
 wildcard and matches any detail argument passed in to emission.</p>
 <div class="refsect3">
 <a name="signal-memory-management"></a><h4>Memory management of signal handlers</h4>
 <p>If you are connecting handlers to signals and using a <a class="link" href="gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> instance as
 your signal handler user data, you should remember to pair calls to
 <a class="link" href="gobject-Signals.html#g-signal-connect" title="g_signal_connect()"><code class="function">g_signal_connect()</code></a> with calls to <a class="link" href="gobject-Signals.html#g-signal-handler-disconnect" title="g_signal_handler_disconnect ()"><code class="function">g_signal_handler_disconnect()</code></a> or
 <a class="link" href="gobject-Signals.html#g-signal-handlers-disconnect-by-func" title="g_signal_handlers_disconnect_by_func()"><code class="function">g_signal_handlers_disconnect_by_func()</code></a>. While signal handlers are
 automatically disconnected when the object emitting the signal is finalised,
 they are not automatically disconnected when the signal handler user data is
 destroyed. If this user data is a <a class="link" href="gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> instance, using it from a
 signal handler after it has been finalised is an error.</p>
 <p>There are two strategies for managing such user data. The first is to
 disconnect the signal handler (using <a class="link" href="gobject-Signals.html#g-signal-handler-disconnect" title="g_signal_handler_disconnect ()"><code class="function">g_signal_handler_disconnect()</code></a> or
 <a class="link" href="gobject-Signals.html#g-signal-handlers-disconnect-by-func" title="g_signal_handlers_disconnect_by_func()"><code class="function">g_signal_handlers_disconnect_by_func()</code></a>) when the user data (object) is
 finalised; this has to be implemented manually. For non-threaded programs,
 <a class="link" href="gobject-Signals.html#g-signal-connect-object" title="g_signal_connect_object ()"><code class="function">g_signal_connect_object()</code></a> can be used to implement this automatically.
 Currently, however, it is unsafe to use in threaded programs.</p>
 <p>The second is to hold a strong reference on the user data until after the
 signal is disconnected for other reasons. This can be implemented
 automatically using <a class="link" href="gobject-Signals.html#g-signal-connect-data" title="g_signal_connect_data ()"><code class="function">g_signal_connect_data()</code></a>.</p>
 <p>The first approach is recommended, as the second approach can result in
 effective memory leaks of the user data if the signal handler is never
 disconnected for some reason.</p>
 </div>
 </div>
 <div class="refsect1">
 <a name="gobject-Signals.functions_details"></a><h2>Functions</h2>
 <div class="refsect2">
 <a name="GSignalAccumulator"></a><h3>GSignalAccumulator ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 <span class="c_punctuation">(</span>*GSignalAccumulator<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalInvocationHint" title="struct GSignalInvocationHint"><span class="type">GSignalInvocationHint</span></a> *ihint</code></em>,
                        <em class="parameter"><code><a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> *return_accu</code></em>,
                        <em class="parameter"><code>const <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> *handler_return</code></em>,
                        <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
 <p>The signal accumulator is a special callback function that can be used
 to collect return values of the various callbacks that are called
 during a signal emission. The signal accumulator is specified at signal
 creation time, if it is left <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, no accumulation of callback return
 values is performed. The return value of signal emissions is then the
 value returned by the last callback.</p>
 <div class="refsect3">
 <a name="GSignalAccumulator.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>ihint</p></td>
 <td class="parameter_description"><p>Signal invocation hint, see <a class="link" href="gobject-Signals.html#GSignalInvocationHint" title="struct GSignalInvocationHint"><span class="type">GSignalInvocationHint</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>return_accu</p></td>
 <td class="parameter_description"><p>Accumulator to collect callback return values in, this
 is the return value of the current signal emission.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>handler_return</p></td>
 <td class="parameter_description"><p>A <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> holding the return value of the signal handler.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>Callback data that was specified when creating the signal.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="GSignalAccumulator.returns"></a><h4>Returns</h4>
 <p> The accumulator function returns whether the signal emission
 should be aborted. Returning <a href="../glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> means to abort the
 current emission and <a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> is returned for continuation.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GSignalEmissionHook"></a><h3>GSignalEmissionHook ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 <span class="c_punctuation">(</span>*GSignalEmissionHook<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalInvocationHint" title="struct GSignalInvocationHint"><span class="type">GSignalInvocationHint</span></a> *ihint</code></em>,
                         <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> n_param_values</code></em>,
                         <em class="parameter"><code>const <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> *param_values</code></em>,
                         <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
 <p>A simple function pointer to get invoked when the signal is emitted. This
 allows you to tie a hook to the signal type, so that it will trap all
 emissions of that signal, from any object.</p>
 <p>You may not attach these to signals created with the <a class="link" href="gobject-Signals.html#G-SIGNAL-NO-HOOKS:CAPS"><span class="type">G_SIGNAL_NO_HOOKS</span></a> flag.</p>
 <div class="refsect3">
 <a name="GSignalEmissionHook.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>ihint</p></td>
 <td class="parameter_description"><p>Signal invocation hint, see <a class="link" href="gobject-Signals.html#GSignalInvocationHint" title="struct GSignalInvocationHint"><span class="type">GSignalInvocationHint</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>n_param_values</p></td>
 <td class="parameter_description"><p>the number of parameters to the function, including
 the instance on which the signal was emitted.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>param_values</p></td>
 <td class="parameter_description"><p> the instance on which
 the signal was emitted, followed by the parameters of the emission. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=n_param_values]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>user data associated with the hook.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="GSignalEmissionHook.returns"></a><h4>Returns</h4>
 <p> whether it wants to stay connected. If it returns <a href="../glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>, the signal
 hook is disconnected (and destroyed).</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-new"></a><h3>g_signal_new ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 g_signal_new (<em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *signal_name</code></em>,
               <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> itype</code></em>,
               <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalFlags" title="enum GSignalFlags"><span class="type">GSignalFlags</span></a> signal_flags</code></em>,
               <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> class_offset</code></em>,
               <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> accumulator</code></em>,
               <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> accu_data</code></em>,
               <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalCMarshaller" title="GSignalCMarshaller"><span class="type">GSignalCMarshaller</span></a> c_marshaller</code></em>,
               <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> return_type</code></em>,
               <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> n_params</code></em>,
               <em class="parameter"><code>...</code></em>);</pre>
 <p>Creates a new signal. (This is usually done in the class initializer.)</p>
 <p>A signal name consists of segments consisting of ASCII letters and
 digits, separated by either the '-' or '_' character. The first
 character of a signal name must be a letter. Names which violate these
 rules lead to undefined behaviour of the GSignal system.</p>
 <p>When registering a signal and looking up a signal, either separator can
 be used, but they cannot be mixed.</p>
 <p>If 0 is used for <em class="parameter"><code>class_offset</code></em>
  subclasses cannot override the class handler
 in their class_init method by doing super_class-&gt;signal_handler = my_signal_handler.
 Instead they will have to use <a class="link" href="gobject-Signals.html#g-signal-override-class-handler" title="g_signal_override_class_handler ()"><code class="function">g_signal_override_class_handler()</code></a>.</p>
 <p>If c_marshaller is <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, <a class="link" href="gobject-Closures.html#g-cclosure-marshal-generic" title="g_cclosure_marshal_generic ()"><code class="function">g_cclosure_marshal_generic()</code></a> will be used as
 the marshaller for this signal.</p>
 <div class="refsect3">
 <a name="g-signal-new.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>signal_name</p></td>
 <td class="parameter_description"><p>the name for the signal</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>itype</p></td>
 <td class="parameter_description"><p>the type this signal pertains to. It will also pertain to
 types which are derived from this type.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_flags</p></td>
 <td class="parameter_description"><p>a combination of <a class="link" href="gobject-Signals.html#GSignalFlags" title="enum GSignalFlags"><span class="type">GSignalFlags</span></a> specifying detail of when
 the default handler is to be invoked. You should at least specify
 <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS"><code class="literal">G_SIGNAL_RUN_FIRST</code></a> or <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">G_SIGNAL_RUN_LAST</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>class_offset</p></td>
 <td class="parameter_description"><p>The offset of the function pointer in the class structure
 for this type. Used to invoke a class method generically. Pass 0 to
 not associate a class method slot with this signal.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>accumulator</p></td>
 <td class="parameter_description"><p>the accumulator for this signal; may be <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>accu_data</p></td>
 <td class="parameter_description"><p>user data for the <em class="parameter"><code>accumulator</code></em>
 .</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>c_marshaller</p></td>
 <td class="parameter_description"><p> the function to translate arrays of parameter
 values to signal emissions into C language callback invocations or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>return_type</p></td>
 <td class="parameter_description"><p>the type of return value, or <a class="link" href="gobject-Type-Information.html#G-TYPE-NONE:CAPS" title="G_TYPE_NONE"><span class="type">G_TYPE_NONE</span></a> for a signal
 without a return value.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>n_params</p></td>
 <td class="parameter_description"><p>the number of parameter types to follow.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>...</p></td>
 <td class="parameter_description"><p>a list of types, one for each parameter.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-new.returns"></a><h4>Returns</h4>
 <p> the signal id</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-newv"></a><h3>g_signal_newv ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 g_signal_newv (<em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *signal_name</code></em>,
                <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> itype</code></em>,
                <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalFlags" title="enum GSignalFlags"><span class="type">GSignalFlags</span></a> signal_flags</code></em>,
                <em class="parameter"><code><a class="link" href="gobject-Closures.html#GClosure" title="struct GClosure"><span class="type">GClosure</span></a> *class_closure</code></em>,
                <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> accumulator</code></em>,
                <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> accu_data</code></em>,
                <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalCMarshaller" title="GSignalCMarshaller"><span class="type">GSignalCMarshaller</span></a> c_marshaller</code></em>,
                <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> return_type</code></em>,
                <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> n_params</code></em>,
                <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> *param_types</code></em>);</pre>
 <p>Creates a new signal. (This is usually done in the class initializer.)</p>
 <p>See <a class="link" href="gobject-Signals.html#g-signal-new" title="g_signal_new ()"><code class="function">g_signal_new()</code></a> for details on allowed signal names.</p>
 <p>If c_marshaller is <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, <a class="link" href="gobject-Closures.html#g-cclosure-marshal-generic" title="g_cclosure_marshal_generic ()"><code class="function">g_cclosure_marshal_generic()</code></a> will be used as
 the marshaller for this signal.</p>
 <div class="refsect3">
 <a name="g-signal-newv.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>signal_name</p></td>
 <td class="parameter_description"><p>the name for the signal</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>itype</p></td>
 <td class="parameter_description"><p>the type this signal pertains to. It will also pertain to
 types which are derived from this type</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_flags</p></td>
 <td class="parameter_description"><p>a combination of <a class="link" href="gobject-Signals.html#GSignalFlags" title="enum GSignalFlags"><span class="type">GSignalFlags</span></a> specifying detail of when
 the default handler is to be invoked. You should at least specify
 <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS"><code class="literal">G_SIGNAL_RUN_FIRST</code></a> or <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">G_SIGNAL_RUN_LAST</code></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>class_closure</p></td>
 <td class="parameter_description"><p> The closure to invoke on signal emission;
 may be <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>accumulator</p></td>
 <td class="parameter_description"><p> the accumulator for this signal; may be <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>accu_data</p></td>
 <td class="parameter_description"><p>user data for the <em class="parameter"><code>accumulator</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>c_marshaller</p></td>
 <td class="parameter_description"><p> the function to translate arrays of
 parameter values to signal emissions into C language callback
 invocations or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>return_type</p></td>
 <td class="parameter_description"><p>the type of return value, or <a class="link" href="gobject-Type-Information.html#G-TYPE-NONE:CAPS" title="G_TYPE_NONE"><span class="type">G_TYPE_NONE</span></a> for a signal
 without a return value</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>n_params</p></td>
 <td class="parameter_description"><p>the length of <em class="parameter"><code>param_types</code></em>
 </p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>param_types</p></td>
 <td class="parameter_description"><p> an array of types, one for
 each parameter. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=n_params]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-newv.returns"></a><h4>Returns</h4>
 <p> the signal id</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-new-valist"></a><h3>g_signal_new_valist ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 g_signal_new_valist (<em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *signal_name</code></em>,
                      <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> itype</code></em>,
                      <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalFlags" title="enum GSignalFlags"><span class="type">GSignalFlags</span></a> signal_flags</code></em>,
                      <em class="parameter"><code><a class="link" href="gobject-Closures.html#GClosure" title="struct GClosure"><span class="type">GClosure</span></a> *class_closure</code></em>,
                      <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> accumulator</code></em>,
                      <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> accu_data</code></em>,
                      <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalCMarshaller" title="GSignalCMarshaller"><span class="type">GSignalCMarshaller</span></a> c_marshaller</code></em>,
                      <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> return_type</code></em>,
                      <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> n_params</code></em>,
                      <em class="parameter"><code><span class="type">va_list</span> args</code></em>);</pre>
 <p>Creates a new signal. (This is usually done in the class initializer.)</p>
 <p>See <a class="link" href="gobject-Signals.html#g-signal-new" title="g_signal_new ()"><code class="function">g_signal_new()</code></a> for details on allowed signal names.</p>
 <p>If c_marshaller is <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, <a class="link" href="gobject-Closures.html#g-cclosure-marshal-generic" title="g_cclosure_marshal_generic ()"><code class="function">g_cclosure_marshal_generic()</code></a> will be used as
 the marshaller for this signal.</p>
 <div class="refsect3">
 <a name="g-signal-new-valist.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>signal_name</p></td>
 <td class="parameter_description"><p>the name for the signal</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>itype</p></td>
 <td class="parameter_description"><p>the type this signal pertains to. It will also pertain to
 types which are derived from this type.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_flags</p></td>
 <td class="parameter_description"><p>a combination of <a class="link" href="gobject-Signals.html#GSignalFlags" title="enum GSignalFlags"><span class="type">GSignalFlags</span></a> specifying detail of when
 the default handler is to be invoked. You should at least specify
 <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS"><code class="literal">G_SIGNAL_RUN_FIRST</code></a> or <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">G_SIGNAL_RUN_LAST</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>class_closure</p></td>
 <td class="parameter_description"><p>The closure to invoke on signal emission; may be <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>accumulator</p></td>
 <td class="parameter_description"><p>the accumulator for this signal; may be <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>accu_data</p></td>
 <td class="parameter_description"><p>user data for the <em class="parameter"><code>accumulator</code></em>
 .</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>c_marshaller</p></td>
 <td class="parameter_description"><p> the function to translate arrays of parameter
 values to signal emissions into C language callback invocations or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>return_type</p></td>
 <td class="parameter_description"><p>the type of return value, or <a class="link" href="gobject-Type-Information.html#G-TYPE-NONE:CAPS" title="G_TYPE_NONE"><span class="type">G_TYPE_NONE</span></a> for a signal
 without a return value.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>n_params</p></td>
 <td class="parameter_description"><p>the number of parameter types in <em class="parameter"><code>args</code></em>
 .</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>args</p></td>
 <td class="parameter_description"><p>va_list of <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a>, one for each parameter.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-new-valist.returns"></a><h4>Returns</h4>
 <p> the signal id</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-set-va-marshaller"></a><h3>g_signal_set_va_marshaller ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_set_va_marshaller (<em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                             <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> instance_type</code></em>,
                             <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalCVaMarshaller" title="GSignalCVaMarshaller"><span class="type">GSignalCVaMarshaller</span></a> va_marshaller</code></em>);</pre>
 <p>Change the <a class="link" href="gobject-Signals.html#GSignalCVaMarshaller" title="GSignalCVaMarshaller"><span class="type">GSignalCVaMarshaller</span></a> used for a given signal.  This is a
 specialised form of the marshaller that can often be used for the
 common case of a single connected signal handler and avoids the
 overhead of <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a>.  Its use is optional.</p>
 <div class="refsect3">
 <a name="g-signal-set-va-marshaller.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>the signal id</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>instance_type</p></td>
 <td class="parameter_description"><p>the instance type on which to set the marshaller.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>va_marshaller</p></td>
 <td class="parameter_description"><p>the marshaller to set.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-32.html#api-index-2.32">2.32</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-query"></a><h3>g_signal_query ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_query (<em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                 <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalQuery" title="struct GSignalQuery"><span class="type">GSignalQuery</span></a> *query</code></em>);</pre>
 <p>Queries the signal system for in-depth information about a
 specific signal. This function will fill in a user-provided
 structure to hold signal-specific information. If an invalid
 signal id is passed in, the <em class="parameter"><code>signal_id</code></em>
  member of the <a class="link" href="gobject-Signals.html#GSignalQuery" title="struct GSignalQuery"><span class="type">GSignalQuery</span></a>
 is 0. All members filled into the <a class="link" href="gobject-Signals.html#GSignalQuery" title="struct GSignalQuery"><span class="type">GSignalQuery</span></a> structure should
 be considered constant and have to be left untouched.</p>
 <div class="refsect3">
 <a name="g-signal-query.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>The signal id of the signal to query information for.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>query</p></td>
 <td class="parameter_description"><p> A user provided structure that is
 filled in with constant values upon success. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out caller-allocates</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-lookup"></a><h3>g_signal_lookup ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 g_signal_lookup (<em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                  <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> itype</code></em>);</pre>
 <p>Given the name of the signal and the type of object it connects to, gets
 the signal's identifying integer. Emitting the signal by number is
 somewhat faster than using the name each time.</p>
 <p>Also tries the ancestors of the given type.</p>
 <p>See <a class="link" href="gobject-Signals.html#g-signal-new" title="g_signal_new ()"><code class="function">g_signal_new()</code></a> for details on allowed signal names.</p>
 <div class="refsect3">
 <a name="g-signal-lookup.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>name</p></td>
 <td class="parameter_description"><p>the signal's name.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>itype</p></td>
 <td class="parameter_description"><p>the type that the signal operates on.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-lookup.returns"></a><h4>Returns</h4>
 <p> the signal's identifying number, or 0 if no signal was found.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-name"></a><h3>g_signal_name ()</h3>
 <pre class="programlisting">const <a href="../glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
 g_signal_name (<em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>);</pre>
 <p>Given the signal's identifier, finds its name.</p>
 <p>Two different signals may have the same name, if they have differing types.</p>
 <div class="refsect3">
 <a name="g-signal-name.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>the signal's identifying number.</p></td>
 <td class="parameter_annotations"> </td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-name.returns"></a><h4>Returns</h4>
 <p> the signal name, or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the signal number was invalid.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-list-ids"></a><h3>g_signal_list_ids ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> *
 g_signal_list_ids (<em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> itype</code></em>,
                    <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> *n_ids</code></em>);</pre>
 <p>Lists the signals by id that a certain instance or interface type
 created. Further information about the signals can be acquired through
 <a class="link" href="gobject-Signals.html#g-signal-query" title="g_signal_query ()"><code class="function">g_signal_query()</code></a>.</p>
 <div class="refsect3">
 <a name="g-signal-list-ids.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>itype</p></td>
 <td class="parameter_description"><p>Instance or interface type.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>n_ids</p></td>
 <td class="parameter_description"><p>Location to store the number of signal ids for <em class="parameter"><code>itype</code></em>
 .</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-list-ids.returns"></a><h4>Returns</h4>
 <p> Newly allocated array of signal IDs. </p>
 <p><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=n_ids][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-emit"></a><h3>g_signal_emit ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_emit (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                <em class="parameter"><code><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> detail</code></em>,
                <em class="parameter"><code>...</code></em>);</pre>
 <p>Emits a signal.</p>
 <p>Note that <a class="link" href="gobject-Signals.html#g-signal-emit" title="g_signal_emit ()"><code class="function">g_signal_emit()</code></a> resets the return value to the default
 if no handlers are connected, in contrast to <a class="link" href="gobject-Signals.html#g-signal-emitv" title="g_signal_emitv ()"><code class="function">g_signal_emitv()</code></a>.</p>
 <div class="refsect3">
 <a name="g-signal-emit.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> the instance the signal is being emitted on. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>the signal id</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detail</p></td>
 <td class="parameter_description"><p>the detail</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>...</p></td>
 <td class="parameter_description"><p>parameters to be passed to the signal, followed by a
 location for the return value. If the return type of the signal
 is <a class="link" href="gobject-Type-Information.html#G-TYPE-NONE:CAPS" title="G_TYPE_NONE"><span class="type">G_TYPE_NONE</span></a>, the return value location can be omitted.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-emit-by-name"></a><h3>g_signal_emit_by_name ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_emit_by_name (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                        <em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *detailed_signal</code></em>,
                        <em class="parameter"><code>...</code></em>);</pre>
 <p>Emits a signal.</p>
 <p>Note that <a class="link" href="gobject-Signals.html#g-signal-emit-by-name" title="g_signal_emit_by_name ()"><code class="function">g_signal_emit_by_name()</code></a> resets the return value to the default
 if no handlers are connected, in contrast to <a class="link" href="gobject-Signals.html#g-signal-emitv" title="g_signal_emitv ()"><code class="function">g_signal_emitv()</code></a>.</p>
 <div class="refsect3">
 <a name="g-signal-emit-by-name.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> the instance the signal is being emitted on. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detailed_signal</p></td>
 <td class="parameter_description"><p>a string of the form "signal-name::detail".</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>...</p></td>
 <td class="parameter_description"><p>parameters to be passed to the signal, followed by a
 location for the return value. If the return type of the signal
 is <a class="link" href="gobject-Type-Information.html#G-TYPE-NONE:CAPS" title="G_TYPE_NONE"><span class="type">G_TYPE_NONE</span></a>, the return value location can be omitted.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-emitv"></a><h3>g_signal_emitv ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_emitv (<em class="parameter"><code>const <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> *instance_and_params</code></em>,
                 <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                 <em class="parameter"><code><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> detail</code></em>,
                 <em class="parameter"><code><a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> *return_value</code></em>);</pre>
 <p>Emits a signal.</p>
 <p>Note that <a class="link" href="gobject-Signals.html#g-signal-emitv" title="g_signal_emitv ()"><code class="function">g_signal_emitv()</code></a> doesn't change <em class="parameter"><code>return_value</code></em>
  if no handlers are
 connected, in contrast to <a class="link" href="gobject-Signals.html#g-signal-emit" title="g_signal_emit ()"><code class="function">g_signal_emit()</code></a> and <a class="link" href="gobject-Signals.html#g-signal-emit-valist" title="g_signal_emit_valist ()"><code class="function">g_signal_emit_valist()</code></a>.</p>
 <div class="refsect3">
 <a name="g-signal-emitv.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance_and_params</p></td>
 <td class="parameter_description"><p> argument list for the signal emission.
 The first element in the array is a <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> for the instance the signal
 is being emitted on. The rest are any arguments to be passed to the signal. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>the signal id</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detail</p></td>
 <td class="parameter_description"><p>the detail</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>return_value</p></td>
 <td class="parameter_description"><p> Location to
 store the return value of the signal emission. This must be provided if the
 specified signal returns a value, but may be ignored otherwise. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="NULL may be passed instead of a pointer to a location."><span class="acronym">optional</span></acronym>]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-emit-valist"></a><h3>g_signal_emit_valist ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_emit_valist (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                       <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                       <em class="parameter"><code><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> detail</code></em>,
                       <em class="parameter"><code><span class="type">va_list</span> var_args</code></em>);</pre>
 <p>Emits a signal.</p>
 <p>Note that <a class="link" href="gobject-Signals.html#g-signal-emit-valist" title="g_signal_emit_valist ()"><code class="function">g_signal_emit_valist()</code></a> resets the return value to the default
 if no handlers are connected, in contrast to <a class="link" href="gobject-Signals.html#g-signal-emitv" title="g_signal_emitv ()"><code class="function">g_signal_emitv()</code></a>.</p>
 <p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
 <div class="refsect3">
 <a name="g-signal-emit-valist.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> the instance the signal is being
 emitted on. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.TypeInstance]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>the signal id</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detail</p></td>
 <td class="parameter_description"><p>the detail</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>var_args</p></td>
 <td class="parameter_description"><p>a list of parameters to be passed to the signal, followed by a
 location for the return value. If the return type of the signal
 is <a class="link" href="gobject-Type-Information.html#G-TYPE-NONE:CAPS" title="G_TYPE_NONE"><span class="type">G_TYPE_NONE</span></a>, the return value location can be omitted.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-connect"></a><h3>g_signal_connect()</h3>
 <pre class="programlisting">#define             g_signal_connect(instance, detailed_signal, c_handler, data)</pre>
 <p>Connects a <a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> function to a signal for a particular object.</p>
 <p>The handler will be called before the default handler of the signal.</p>
 <p>See <a class="link" href="gobject-Signals.html#signal-memory-management" title="Memory management of signal handlers">memory management of signal handlers</a> for
 details on how to handle the return value and memory management of <em class="parameter"><code>data</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-signal-connect.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p>the instance to connect to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detailed_signal</p></td>
 <td class="parameter_description"><p>a string of the form "signal-name::detail".</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>c_handler</p></td>
 <td class="parameter_description"><p>the <a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> to connect.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>c_handler</code></em>
 calls.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-connect.returns"></a><h4>Returns</h4>
 <p> the handler id (always greater than 0 for successful connections)</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-connect-after"></a><h3>g_signal_connect_after()</h3>
 <pre class="programlisting">#define             g_signal_connect_after(instance, detailed_signal, c_handler, data)</pre>
 <p>Connects a <a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> function to a signal for a particular object.</p>
 <p>The handler will be called after the default handler of the signal.</p>
 <div class="refsect3">
 <a name="g-signal-connect-after.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p>the instance to connect to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detailed_signal</p></td>
 <td class="parameter_description"><p>a string of the form "signal-name::detail".</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>c_handler</p></td>
 <td class="parameter_description"><p>the <a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> to connect.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>c_handler</code></em>
 calls.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-connect-after.returns"></a><h4>Returns</h4>
 <p> the handler id (always greater than 0 for successful connections)</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-connect-swapped"></a><h3>g_signal_connect_swapped()</h3>
 <pre class="programlisting">#define             g_signal_connect_swapped(instance, detailed_signal, c_handler, data)</pre>
 <p>Connects a <a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> function to a signal for a particular object.</p>
 <p>The instance on which the signal is emitted and <em class="parameter"><code>data</code></em>
  will be swapped when
 calling the handler. This is useful when calling pre-existing functions to
 operate purely on the <em class="parameter"><code>data</code></em>
 , rather than the <em class="parameter"><code>instance</code></em>
 : swapping the
 parameters avoids the need to write a wrapper function.</p>
 <p>For example, this allows the shorter code:</p>
 <div class="informalexample">
   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
     <tbody>
       <tr>
         <td class="listing_lines" align="right"><pre>1
 2</pre></td>
         <td class="listing_code"><pre class="programlisting"><span class="function"><a href="gobject-Signals.html#g-signal-connect-swapped">g_signal_connect_swapped</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">button</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"clicked"</span><span class="symbol">,</span>
 <span class="normal">                          </span><span class="symbol">(</span><span class="normal"><a href="gobject-Closures.html#GCallback">GCallback</a></span><span class="symbol">)</span><span class="normal"> <a href="http://developer.gnome.org/gtk3/GtkWidget.html#gtk-widget-hide">gtk_widget_hide</a></span><span class="symbol">,</span><span class="normal"> other_widget</span><span class="symbol">);</span></pre></td>
       </tr>
     </tbody>
   </table>
 </div>

 <p></p>
 <p>Rather than the cumbersome:</p>
 <div class="informalexample">
   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
     <tbody>
       <tr>
         <td class="listing_lines" align="right"><pre>1
 2
 3
 4
 5
 6
 7
 8
 9
 10</pre></td>
         <td class="listing_code"><pre class="programlisting"><span class="keyword">static</span><span class="normal"> </span><span class="type">void</span>
 <span class="function">button_clicked_cb</span><span class="normal"> </span><span class="symbol">(</span><span class="usertype">GtkButton</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">button</span><span class="symbol">,</span><span class="normal"> </span><span class="usertype">GtkWidget</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">other_widget</span><span class="symbol">)</span>
 <span class="cbracket">{</span>
 <span class="normal">    </span><span class="function"><a href="http://developer.gnome.org/gtk3/GtkWidget.html#gtk-widget-hide">gtk_widget_hide</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">other_widget</span><span class="symbol">);</span>
 <span class="cbracket">}</span>

 <span class="symbol">...</span>

 <span class="function"><a href="gobject-Signals.html#g-signal-connect">g_signal_connect</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">button</span><span class="symbol">,</span><span class="normal"> </span><span class="string">"clicked"</span><span class="symbol">,</span>
 <span class="normal">                  </span><span class="symbol">(</span><span class="normal"><a href="gobject-Closures.html#GCallback">GCallback</a></span><span class="symbol">)</span><span class="normal"> button_clicked_cb</span><span class="symbol">,</span><span class="normal"> other_widget</span><span class="symbol">);</span></pre></td>
       </tr>
     </tbody>
   </table>
 </div>

 <p></p>
 <div class="refsect3">
 <a name="g-signal-connect-swapped.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p>the instance to connect to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detailed_signal</p></td>
 <td class="parameter_description"><p>a string of the form "signal-name::detail".</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>c_handler</p></td>
 <td class="parameter_description"><p>the <a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> to connect.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>c_handler</code></em>
 calls.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-connect-swapped.returns"></a><h4>Returns</h4>
 <p> the handler ID (always greater than 0 for successful connections)</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-connect-object"></a><h3>g_signal_connect_object ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 g_signal_connect_object (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                          <em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *detailed_signal</code></em>,
                          <em class="parameter"><code><a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> c_handler</code></em>,
                          <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> gobject</code></em>,
                          <em class="parameter"><code><a class="link" href="gobject-Signals.html#GConnectFlags" title="enum GConnectFlags"><span class="type">GConnectFlags</span></a> connect_flags</code></em>);</pre>
 <p>This is similar to <a class="link" href="gobject-Signals.html#g-signal-connect-data" title="g_signal_connect_data ()"><code class="function">g_signal_connect_data()</code></a>, but uses a closure which
 ensures that the <em class="parameter"><code>gobject</code></em>
  stays alive during the call to <em class="parameter"><code>c_handler</code></em>

 by temporarily adding a reference count to <em class="parameter"><code>gobject</code></em>
 .</p>
 <p>When the <em class="parameter"><code>gobject</code></em>
  is destroyed the signal handler will be automatically
 disconnected.  Note that this is not currently threadsafe (ie:
 emitting a signal while <em class="parameter"><code>gobject</code></em>
  is being destroyed in another thread
 is not safe).</p>
 <p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
 <div class="refsect3">
 <a name="g-signal-connect-object.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> the instance to connect to. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.TypeInstance]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detailed_signal</p></td>
 <td class="parameter_description"><p>a string of the form "signal-name::detail".</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>c_handler</p></td>
 <td class="parameter_description"><p>the <a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> to connect.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>gobject</p></td>
 <td class="parameter_description"><p> the object to pass as data
 to <em class="parameter"><code>c_handler</code></em>
 . </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>connect_flags</p></td>
 <td class="parameter_description"><p>a combination of <a class="link" href="gobject-Signals.html#GConnectFlags" title="enum GConnectFlags"><span class="type">GConnectFlags</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-connect-object.returns"></a><h4>Returns</h4>
 <p> the handler id.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-connect-data"></a><h3>g_signal_connect_data ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 g_signal_connect_data (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                        <em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *detailed_signal</code></em>,
                        <em class="parameter"><code><a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> c_handler</code></em>,
                        <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>,
                        <em class="parameter"><code><a class="link" href="gobject-Closures.html#GClosureNotify" title="GClosureNotify ()"><span class="type">GClosureNotify</span></a> destroy_data</code></em>,
                        <em class="parameter"><code><a class="link" href="gobject-Signals.html#GConnectFlags" title="enum GConnectFlags"><span class="type">GConnectFlags</span></a> connect_flags</code></em>);</pre>
 <p>Connects a <a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> function to a signal for a particular object. Similar
 to <a class="link" href="gobject-Signals.html#g-signal-connect" title="g_signal_connect()"><code class="function">g_signal_connect()</code></a>, but allows to provide a <a class="link" href="gobject-Closures.html#GClosureNotify" title="GClosureNotify ()"><span class="type">GClosureNotify</span></a> for the data
 which will be called when the signal handler is disconnected and no longer
 used. Specify <em class="parameter"><code>connect_flags</code></em>
  if you need <code class="literal">..._after()</code> or
 <code class="literal">..._swapped()</code> variants of this function.</p>
 <div class="refsect3">
 <a name="g-signal-connect-data.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> the instance to connect to. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detailed_signal</p></td>
 <td class="parameter_description"><p>a string of the form "signal-name::detail".</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>c_handler</p></td>
 <td class="parameter_description"><p>the <a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> to connect.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>data to pass to <em class="parameter"><code>c_handler</code></em>
 calls.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>destroy_data</p></td>
 <td class="parameter_description"><p>a <a class="link" href="gobject-Closures.html#GClosureNotify" title="GClosureNotify ()"><span class="type">GClosureNotify</span></a> for <em class="parameter"><code>data</code></em>
 .</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>connect_flags</p></td>
 <td class="parameter_description"><p>a combination of <a class="link" href="gobject-Signals.html#GConnectFlags" title="enum GConnectFlags"><span class="type">GConnectFlags</span></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-connect-data.returns"></a><h4>Returns</h4>
 <p> the handler id (always greater than 0 for successful connections)</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-connect-closure"></a><h3>g_signal_connect_closure ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 g_signal_connect_closure (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                           <em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *detailed_signal</code></em>,
                           <em class="parameter"><code><a class="link" href="gobject-Closures.html#GClosure" title="struct GClosure"><span class="type">GClosure</span></a> *closure</code></em>,
                           <em class="parameter"><code><a href="../glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> after</code></em>);</pre>
 <p>Connects a closure to a signal for a particular object.</p>
 <div class="refsect3">
 <a name="g-signal-connect-closure.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> the instance to connect to. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detailed_signal</p></td>
 <td class="parameter_description"><p>a string of the form "signal-name::detail".</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>closure</p></td>
 <td class="parameter_description"><p>the closure to connect.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>after</p></td>
 <td class="parameter_description"><p>whether the handler should be called before or after the
 default handler of the signal.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-connect-closure.returns"></a><h4>Returns</h4>
 <p> the handler id (always greater than 0 for successful connections)</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-connect-closure-by-id"></a><h3>g_signal_connect_closure_by_id ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 g_signal_connect_closure_by_id (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                                 <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                                 <em class="parameter"><code><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> detail</code></em>,
                                 <em class="parameter"><code><a class="link" href="gobject-Closures.html#GClosure" title="struct GClosure"><span class="type">GClosure</span></a> *closure</code></em>,
                                 <em class="parameter"><code><a href="../glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> after</code></em>);</pre>
 <p>Connects a closure to a signal for a particular object.</p>
 <div class="refsect3">
 <a name="g-signal-connect-closure-by-id.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> the instance to connect to. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>the id of the signal.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detail</p></td>
 <td class="parameter_description"><p>the detail.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>closure</p></td>
 <td class="parameter_description"><p>the closure to connect.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>after</p></td>
 <td class="parameter_description"><p>whether the handler should be called before or after the
 default handler of the signal.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-connect-closure-by-id.returns"></a><h4>Returns</h4>
 <p> the handler id (always greater than 0 for successful connections)</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-handler-block"></a><h3>g_signal_handler_block ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_handler_block (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                         <em class="parameter"><code><a href="../glib-Basic-Types.html#gulong"><span class="type">gulong</span></a> handler_id</code></em>);</pre>
 <p>Blocks a handler of an instance so it will not be called during any
 signal emissions unless it is unblocked again. Thus "blocking" a
 signal handler means to temporarily deactive it, a signal handler
 has to be unblocked exactly the same amount of times it has been
 blocked before to become active again.</p>
 <p>The <em class="parameter"><code>handler_id</code></em>
  has to be a valid signal handler id, connected to a
 signal of <em class="parameter"><code>instance</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-signal-handler-block.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> The instance to block the signal handler of. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>handler_id</p></td>
 <td class="parameter_description"><p>Handler id of the handler to be blocked.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-handler-unblock"></a><h3>g_signal_handler_unblock ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_handler_unblock (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                           <em class="parameter"><code><a href="../glib-Basic-Types.html#gulong"><span class="type">gulong</span></a> handler_id</code></em>);</pre>
 <p>Undoes the effect of a previous <a class="link" href="gobject-Signals.html#g-signal-handler-block" title="g_signal_handler_block ()"><code class="function">g_signal_handler_block()</code></a> call.  A
 blocked handler is skipped during signal emissions and will not be
 invoked, unblocking it (for exactly the amount of times it has been
 blocked before) reverts its "blocked" state, so the handler will be
 recognized by the signal system and is called upon future or
 currently ongoing signal emissions (since the order in which
 handlers are called during signal emissions is deterministic,
 whether the unblocked handler in question is called as part of a
 currently ongoing emission depends on how far that emission has
 proceeded yet).</p>
 <p>The <em class="parameter"><code>handler_id</code></em>
  has to be a valid id of a signal handler that is
 connected to a signal of <em class="parameter"><code>instance</code></em>
  and is currently blocked.</p>
 <div class="refsect3">
 <a name="g-signal-handler-unblock.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> The instance to unblock the signal handler of. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>handler_id</p></td>
 <td class="parameter_description"><p>Handler id of the handler to be unblocked.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-handler-disconnect"></a><h3>g_signal_handler_disconnect ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_handler_disconnect (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                              <em class="parameter"><code><a href="../glib-Basic-Types.html#gulong"><span class="type">gulong</span></a> handler_id</code></em>);</pre>
 <p>Disconnects a handler from an instance so it will not be called during
 any future or currently ongoing emissions of the signal it has been
 connected to. The <em class="parameter"><code>handler_id</code></em>
  becomes invalid and may be reused.</p>
 <p>The <em class="parameter"><code>handler_id</code></em>
  has to be a valid signal handler id, connected to a
 signal of <em class="parameter"><code>instance</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-signal-handler-disconnect.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> The instance to remove the signal handler from. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>handler_id</p></td>
 <td class="parameter_description"><p>Handler id of the handler to be disconnected.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-handler-find"></a><h3>g_signal_handler_find ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 g_signal_handler_find (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                        <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalMatchType" title="enum GSignalMatchType"><span class="type">GSignalMatchType</span></a> mask</code></em>,
                        <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                        <em class="parameter"><code><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> detail</code></em>,
                        <em class="parameter"><code><a class="link" href="gobject-Closures.html#GClosure" title="struct GClosure"><span class="type">GClosure</span></a> *closure</code></em>,
                        <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> func</code></em>,
                        <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
 <p>Finds the first signal handler that matches certain selection criteria.
 The criteria mask is passed as an OR-ed combination of <a class="link" href="gobject-Signals.html#GSignalMatchType" title="enum GSignalMatchType"><span class="type">GSignalMatchType</span></a>
 flags, and the criteria values are passed as arguments.
 The match <em class="parameter"><code>mask</code></em>
  has to be non-0 for successful matches.
 If no handler was found, 0 is returned.</p>
 <div class="refsect3">
 <a name="g-signal-handler-find.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> The instance owning the signal handler to be found. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>mask</p></td>
 <td class="parameter_description"><p>Mask indicating which of <em class="parameter"><code>signal_id</code></em>
 , <em class="parameter"><code>detail</code></em>
 , <em class="parameter"><code>closure</code></em>
 , <em class="parameter"><code>func</code></em>
 and/or <em class="parameter"><code>data</code></em>
 the handler has to match.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>Signal the handler has to be connected to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detail</p></td>
 <td class="parameter_description"><p>Signal detail the handler has to be connected to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>closure</p></td>
 <td class="parameter_description"><p> The closure the handler will invoke. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>func</p></td>
 <td class="parameter_description"><p>The C closure callback of the handler (useless for non-C closures).</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>The closure data of the handler's closure.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-handler-find.returns"></a><h4>Returns</h4>
 <p> A valid non-0 signal handler id for a successful match.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-handlers-block-matched"></a><h3>g_signal_handlers_block_matched ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 g_signal_handlers_block_matched (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                                  <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalMatchType" title="enum GSignalMatchType"><span class="type">GSignalMatchType</span></a> mask</code></em>,
                                  <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                                  <em class="parameter"><code><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> detail</code></em>,
                                  <em class="parameter"><code><a class="link" href="gobject-Closures.html#GClosure" title="struct GClosure"><span class="type">GClosure</span></a> *closure</code></em>,
                                  <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> func</code></em>,
                                  <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
 <p>Blocks all handlers on an instance that match a certain selection criteria.
 The criteria mask is passed as an OR-ed combination of <a class="link" href="gobject-Signals.html#GSignalMatchType" title="enum GSignalMatchType"><span class="type">GSignalMatchType</span></a>
 flags, and the criteria values are passed as arguments.
 Passing at least one of the <a class="link" href="gobject-Signals.html#G-SIGNAL-MATCH-CLOSURE:CAPS"><code class="literal">G_SIGNAL_MATCH_CLOSURE</code></a>, <a class="link" href="gobject-Signals.html#G-SIGNAL-MATCH-FUNC:CAPS"><code class="literal">G_SIGNAL_MATCH_FUNC</code></a>
 or <a class="link" href="gobject-Signals.html#G-SIGNAL-MATCH-DATA:CAPS"><code class="literal">G_SIGNAL_MATCH_DATA</code></a> match flags is required for successful matches.
 If no handlers were found, 0 is returned, the number of blocked handlers
 otherwise.</p>
 <div class="refsect3">
 <a name="g-signal-handlers-block-matched.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> The instance to block handlers from. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>mask</p></td>
 <td class="parameter_description"><p>Mask indicating which of <em class="parameter"><code>signal_id</code></em>
 , <em class="parameter"><code>detail</code></em>
 , <em class="parameter"><code>closure</code></em>
 , <em class="parameter"><code>func</code></em>
 and/or <em class="parameter"><code>data</code></em>
 the handlers have to match.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>Signal the handlers have to be connected to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detail</p></td>
 <td class="parameter_description"><p>Signal detail the handlers have to be connected to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>closure</p></td>
 <td class="parameter_description"><p> The closure the handlers will invoke. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>func</p></td>
 <td class="parameter_description"><p>The C closure callback of the handlers (useless for non-C closures).</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>The closure data of the handlers' closures.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-handlers-block-matched.returns"></a><h4>Returns</h4>
 <p> The number of handlers that matched.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-handlers-unblock-matched"></a><h3>g_signal_handlers_unblock_matched ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 g_signal_handlers_unblock_matched (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                                    <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalMatchType" title="enum GSignalMatchType"><span class="type">GSignalMatchType</span></a> mask</code></em>,
                                    <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                                    <em class="parameter"><code><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> detail</code></em>,
                                    <em class="parameter"><code><a class="link" href="gobject-Closures.html#GClosure" title="struct GClosure"><span class="type">GClosure</span></a> *closure</code></em>,
                                    <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> func</code></em>,
                                    <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
 <p>Unblocks all handlers on an instance that match a certain selection
 criteria. The criteria mask is passed as an OR-ed combination of
 <a class="link" href="gobject-Signals.html#GSignalMatchType" title="enum GSignalMatchType"><span class="type">GSignalMatchType</span></a> flags, and the criteria values are passed as arguments.
 Passing at least one of the <a class="link" href="gobject-Signals.html#G-SIGNAL-MATCH-CLOSURE:CAPS"><code class="literal">G_SIGNAL_MATCH_CLOSURE</code></a>, <a class="link" href="gobject-Signals.html#G-SIGNAL-MATCH-FUNC:CAPS"><code class="literal">G_SIGNAL_MATCH_FUNC</code></a>
 or <a class="link" href="gobject-Signals.html#G-SIGNAL-MATCH-DATA:CAPS"><code class="literal">G_SIGNAL_MATCH_DATA</code></a> match flags is required for successful matches.
 If no handlers were found, 0 is returned, the number of unblocked handlers
 otherwise. The match criteria should not apply to any handlers that are
 not currently blocked.</p>
 <div class="refsect3">
 <a name="g-signal-handlers-unblock-matched.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> The instance to unblock handlers from. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>mask</p></td>
 <td class="parameter_description"><p>Mask indicating which of <em class="parameter"><code>signal_id</code></em>
 , <em class="parameter"><code>detail</code></em>
 , <em class="parameter"><code>closure</code></em>
 , <em class="parameter"><code>func</code></em>
 and/or <em class="parameter"><code>data</code></em>
 the handlers have to match.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>Signal the handlers have to be connected to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detail</p></td>
 <td class="parameter_description"><p>Signal detail the handlers have to be connected to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>closure</p></td>
 <td class="parameter_description"><p> The closure the handlers will invoke. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>func</p></td>
 <td class="parameter_description"><p>The C closure callback of the handlers (useless for non-C closures).</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>The closure data of the handlers' closures.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-handlers-unblock-matched.returns"></a><h4>Returns</h4>
 <p> The number of handlers that matched.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-handlers-disconnect-matched"></a><h3>g_signal_handlers_disconnect_matched ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 g_signal_handlers_disconnect_matched (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                                       <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalMatchType" title="enum GSignalMatchType"><span class="type">GSignalMatchType</span></a> mask</code></em>,
                                       <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                                       <em class="parameter"><code><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> detail</code></em>,
                                       <em class="parameter"><code><a class="link" href="gobject-Closures.html#GClosure" title="struct GClosure"><span class="type">GClosure</span></a> *closure</code></em>,
                                       <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> func</code></em>,
                                       <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>);</pre>
 <p>Disconnects all handlers on an instance that match a certain
 selection criteria. The criteria mask is passed as an OR-ed
 combination of <a class="link" href="gobject-Signals.html#GSignalMatchType" title="enum GSignalMatchType"><span class="type">GSignalMatchType</span></a> flags, and the criteria values are
 passed as arguments.  Passing at least one of the
 <a class="link" href="gobject-Signals.html#G-SIGNAL-MATCH-CLOSURE:CAPS"><code class="literal">G_SIGNAL_MATCH_CLOSURE</code></a>, <a class="link" href="gobject-Signals.html#G-SIGNAL-MATCH-FUNC:CAPS"><code class="literal">G_SIGNAL_MATCH_FUNC</code></a> or
 <a class="link" href="gobject-Signals.html#G-SIGNAL-MATCH-DATA:CAPS"><code class="literal">G_SIGNAL_MATCH_DATA</code></a> match flags is required for successful
 matches.  If no handlers were found, 0 is returned, the number of
 disconnected handlers otherwise.</p>
 <div class="refsect3">
 <a name="g-signal-handlers-disconnect-matched.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> The instance to remove handlers from. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>mask</p></td>
 <td class="parameter_description"><p>Mask indicating which of <em class="parameter"><code>signal_id</code></em>
 , <em class="parameter"><code>detail</code></em>
 , <em class="parameter"><code>closure</code></em>
 , <em class="parameter"><code>func</code></em>
 and/or <em class="parameter"><code>data</code></em>
 the handlers have to match.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>Signal the handlers have to be connected to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detail</p></td>
 <td class="parameter_description"><p>Signal detail the handlers have to be connected to.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>closure</p></td>
 <td class="parameter_description"><p> The closure the handlers will invoke. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>func</p></td>
 <td class="parameter_description"><p>The C closure callback of the handlers (useless for non-C closures).</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>The closure data of the handlers' closures.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-handlers-disconnect-matched.returns"></a><h4>Returns</h4>
 <p> The number of handlers that matched.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-handler-is-connected"></a><h3>g_signal_handler_is_connected ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 g_signal_handler_is_connected (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                                <em class="parameter"><code><a href="../glib-Basic-Types.html#gulong"><span class="type">gulong</span></a> handler_id</code></em>);</pre>
 <p>Returns whether <em class="parameter"><code>handler_id</code></em>
  is the id of a handler connected to <em class="parameter"><code>instance</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-signal-handler-is-connected.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> The instance where a signal handler is sought. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>handler_id</p></td>
 <td class="parameter_description"><p>the handler id.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-handler-is-connected.returns"></a><h4>Returns</h4>
 <p> whether <em class="parameter"><code>handler_id</code></em>
 identifies a handler connected to <em class="parameter"><code>instance</code></em>
 .</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-handlers-block-by-func"></a><h3>g_signal_handlers_block_by_func()</h3>
 <pre class="programlisting">#define             g_signal_handlers_block_by_func(instance, func, data)</pre>
 <p>Blocks all handlers on an instance that match <em class="parameter"><code>func</code></em>
  and <em class="parameter"><code>data</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-signal-handlers-block-by-func.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p>The instance to block handlers from.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>func</p></td>
 <td class="parameter_description"><p>The C closure callback of the handlers (useless for non-C closures).</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>The closure data of the handlers' closures.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-handlers-block-by-func.returns"></a><h4>Returns</h4>
 <p> The number of handlers that matched.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-handlers-unblock-by-func"></a><h3>g_signal_handlers_unblock_by_func()</h3>
 <pre class="programlisting">#define             g_signal_handlers_unblock_by_func(instance, func, data)</pre>
 <p>Unblocks all handlers on an instance that match <em class="parameter"><code>func</code></em>
  and <em class="parameter"><code>data</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-signal-handlers-unblock-by-func.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p>The instance to unblock handlers from.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>func</p></td>
 <td class="parameter_description"><p>The C closure callback of the handlers (useless for non-C closures).</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>The closure data of the handlers' closures.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-handlers-unblock-by-func.returns"></a><h4>Returns</h4>
 <p> The number of handlers that matched.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-handlers-disconnect-by-func"></a><h3>g_signal_handlers_disconnect_by_func()</h3>
 <pre class="programlisting">#define             g_signal_handlers_disconnect_by_func(instance, func, data)</pre>
 <p>Disconnects all handlers on an instance that match <em class="parameter"><code>func</code></em>
  and <em class="parameter"><code>data</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-signal-handlers-disconnect-by-func.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p>The instance to remove handlers from.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>func</p></td>
 <td class="parameter_description"><p>The C closure callback of the handlers (useless for non-C closures).</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>The closure data of the handlers' closures.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-handlers-disconnect-by-func.returns"></a><h4>Returns</h4>
 <p> The number of handlers that matched.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-handlers-disconnect-by-data"></a><h3>g_signal_handlers_disconnect_by_data()</h3>
 <pre class="programlisting">#define             g_signal_handlers_disconnect_by_data(instance, data)</pre>
 <p>Disconnects all handlers on an instance that match <em class="parameter"><code>data</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-signal-handlers-disconnect-by-data.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p>The instance to remove handlers from</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data</p></td>
 <td class="parameter_description"><p>the closure data of the handlers' closures</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-handlers-disconnect-by-data.returns"></a><h4>Returns</h4>
 <p> The number of handlers that matched.</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-32.html#api-index-2.32">2.32</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-has-handler-pending"></a><h3>g_signal_has_handler_pending ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 g_signal_has_handler_pending (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                               <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                               <em class="parameter"><code><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> detail</code></em>,
                               <em class="parameter"><code><a href="../glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> may_be_blocked</code></em>);</pre>
 <p>Returns whether there are any handlers connected to <em class="parameter"><code>instance</code></em>
  for the
 given signal id and detail.</p>
 <p>If <em class="parameter"><code>detail</code></em>
  is 0 then it will only match handlers that were connected
 without detail.  If <em class="parameter"><code>detail</code></em>
  is non-zero then it will match handlers
 connected both without detail and with the given detail.  This is
 consistent with how a signal emitted with <em class="parameter"><code>detail</code></em>
  would be delivered
 to those handlers.</p>
 <p>Since 2.46 this also checks for a non-default class closure being
 installed, as this is basically always what you want.</p>
 <p>One example of when you might use this is when the arguments to the
 signal are difficult to compute. A class implementor may opt to not
 emit the signal if no one is attached anyway, thus saving the cost
 of building the arguments.</p>
 <div class="refsect3">
 <a name="g-signal-has-handler-pending.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> the object whose signal handlers are sought. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>the signal id.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detail</p></td>
 <td class="parameter_description"><p>the detail.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>may_be_blocked</p></td>
 <td class="parameter_description"><p>whether blocked handlers should count as match.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-has-handler-pending.returns"></a><h4>Returns</h4>
 <p> <a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if a handler is connected to the signal, <a href="../glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>
 otherwise.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-stop-emission"></a><h3>g_signal_stop_emission ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_stop_emission (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                         <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                         <em class="parameter"><code><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> detail</code></em>);</pre>
 <p>Stops a signal's current emission.</p>
 <p>This will prevent the default method from running, if the signal was
 <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">G_SIGNAL_RUN_LAST</code></a> and you connected normally (i.e. without the "after"
 flag).</p>
 <p>Prints a warning if used on a signal which isn't being emitted.</p>
 <div class="refsect3">
 <a name="g-signal-stop-emission.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> the object whose signal handlers you wish to stop. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>the signal identifier, as returned by <a class="link" href="gobject-Signals.html#g-signal-lookup" title="g_signal_lookup ()"><code class="function">g_signal_lookup()</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detail</p></td>
 <td class="parameter_description"><p>the detail which the signal was emitted with.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-stop-emission-by-name"></a><h3>g_signal_stop_emission_by_name ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_stop_emission_by_name (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                                 <em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *detailed_signal</code></em>);</pre>
 <p>Stops a signal's current emission.</p>
 <p>This is just like <a class="link" href="gobject-Signals.html#g-signal-stop-emission" title="g_signal_stop_emission ()"><code class="function">g_signal_stop_emission()</code></a> except it will look up the
 signal id for you.</p>
 <div class="refsect3">
 <a name="g-signal-stop-emission-by-name.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> the object whose signal handlers you wish to stop. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detailed_signal</p></td>
 <td class="parameter_description"><p>a string of the form "signal-name::detail".</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-override-class-closure"></a><h3>g_signal_override_class_closure ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_override_class_closure (<em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                                  <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> instance_type</code></em>,
                                  <em class="parameter"><code><a class="link" href="gobject-Closures.html#GClosure" title="struct GClosure"><span class="type">GClosure</span></a> *class_closure</code></em>);</pre>
 <p>Overrides the class closure (i.e. the default handler) for the given signal
 for emissions on instances of <em class="parameter"><code>instance_type</code></em>
 . <em class="parameter"><code>instance_type</code></em>
  must be derived
 from the type to which the signal belongs.</p>
 <p>See <a class="link" href="gobject-Signals.html#g-signal-chain-from-overridden" title="g_signal_chain_from_overridden ()"><code class="function">g_signal_chain_from_overridden()</code></a> and
 <a class="link" href="gobject-Signals.html#g-signal-chain-from-overridden-handler" title="g_signal_chain_from_overridden_handler ()"><code class="function">g_signal_chain_from_overridden_handler()</code></a> for how to chain up to the
 parent class closure from inside the overridden one.</p>
 <div class="refsect3">
 <a name="g-signal-override-class-closure.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>the signal id</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>instance_type</p></td>
 <td class="parameter_description"><p>the instance type on which to override the class closure
 for the signal.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>class_closure</p></td>
 <td class="parameter_description"><p>the closure.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-chain-from-overridden"></a><h3>g_signal_chain_from_overridden ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_chain_from_overridden (<em class="parameter"><code>const <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> *instance_and_params</code></em>,
                                 <em class="parameter"><code><a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> *return_value</code></em>);</pre>
 <p>Calls the original class closure of a signal. This function should only
 be called from an overridden class closure; see
 <a class="link" href="gobject-Signals.html#g-signal-override-class-closure" title="g_signal_override_class_closure ()"><code class="function">g_signal_override_class_closure()</code></a> and
 <a class="link" href="gobject-Signals.html#g-signal-override-class-handler" title="g_signal_override_class_handler ()"><code class="function">g_signal_override_class_handler()</code></a>.</p>
 <div class="refsect3">
 <a name="g-signal-chain-from-overridden.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance_and_params</p></td>
 <td class="parameter_description"><p>(array) the argument list of the signal emission.
 The first element in the array is a <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> for the instance the signal
 is being emitted on. The rest are any arguments to be passed to the signal.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>return_value</p></td>
 <td class="parameter_description"><p>Location for the return value.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-new-class-handler"></a><h3>g_signal_new_class_handler ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
 g_signal_new_class_handler (<em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *signal_name</code></em>,
                             <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> itype</code></em>,
                             <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalFlags" title="enum GSignalFlags"><span class="type">GSignalFlags</span></a> signal_flags</code></em>,
                             <em class="parameter"><code><a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> class_handler</code></em>,
                             <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> accumulator</code></em>,
                             <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> accu_data</code></em>,
                             <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalCMarshaller" title="GSignalCMarshaller"><span class="type">GSignalCMarshaller</span></a> c_marshaller</code></em>,
                             <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> return_type</code></em>,
                             <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> n_params</code></em>,
                             <em class="parameter"><code>...</code></em>);</pre>
 <p>Creates a new signal. (This is usually done in the class initializer.)</p>
 <p>This is a variant of <a class="link" href="gobject-Signals.html#g-signal-new" title="g_signal_new ()"><code class="function">g_signal_new()</code></a> that takes a C callback instead
 off a class offset for the signal's class handler. This function
 doesn't need a function pointer exposed in the class structure of
 an object definition, instead the function pointer is passed
 directly and can be overriden by derived classes with
 <a class="link" href="gobject-Signals.html#g-signal-override-class-closure" title="g_signal_override_class_closure ()"><code class="function">g_signal_override_class_closure()</code></a> or
 <a class="link" href="gobject-Signals.html#g-signal-override-class-handler" title="g_signal_override_class_handler ()"><code class="function">g_signal_override_class_handler()</code></a>and chained to with
 <a class="link" href="gobject-Signals.html#g-signal-chain-from-overridden" title="g_signal_chain_from_overridden ()"><code class="function">g_signal_chain_from_overridden()</code></a> or
 <a class="link" href="gobject-Signals.html#g-signal-chain-from-overridden-handler" title="g_signal_chain_from_overridden_handler ()"><code class="function">g_signal_chain_from_overridden_handler()</code></a>.</p>
 <p>See <a class="link" href="gobject-Signals.html#g-signal-new" title="g_signal_new ()"><code class="function">g_signal_new()</code></a> for information about signal names.</p>
 <p>If c_marshaller is <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, <a class="link" href="gobject-Closures.html#g-cclosure-marshal-generic" title="g_cclosure_marshal_generic ()"><code class="function">g_cclosure_marshal_generic()</code></a> will be used as
 the marshaller for this signal.</p>
 <div class="refsect3">
 <a name="g-signal-new-class-handler.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>signal_name</p></td>
 <td class="parameter_description"><p>the name for the signal</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>itype</p></td>
 <td class="parameter_description"><p>the type this signal pertains to. It will also pertain to
 types which are derived from this type.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_flags</p></td>
 <td class="parameter_description"><p>a combination of <a class="link" href="gobject-Signals.html#GSignalFlags" title="enum GSignalFlags"><span class="type">GSignalFlags</span></a> specifying detail of when
 the default handler is to be invoked. You should at least specify
 <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS"><code class="literal">G_SIGNAL_RUN_FIRST</code></a> or <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">G_SIGNAL_RUN_LAST</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>class_handler</p></td>
 <td class="parameter_description"><p>a <a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> which acts as class implementation of
 this signal. Used to invoke a class method generically. Pass <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to
 not associate a class method with this signal.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>accumulator</p></td>
 <td class="parameter_description"><p>the accumulator for this signal; may be <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>accu_data</p></td>
 <td class="parameter_description"><p>user data for the <em class="parameter"><code>accumulator</code></em>
 .</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>c_marshaller</p></td>
 <td class="parameter_description"><p> the function to translate arrays of parameter
 values to signal emissions into C language callback invocations or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>return_type</p></td>
 <td class="parameter_description"><p>the type of return value, or <a class="link" href="gobject-Type-Information.html#G-TYPE-NONE:CAPS" title="G_TYPE_NONE"><span class="type">G_TYPE_NONE</span></a> for a signal
 without a return value.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>n_params</p></td>
 <td class="parameter_description"><p>the number of parameter types to follow.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>...</p></td>
 <td class="parameter_description"><p>a list of types, one for each parameter.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-new-class-handler.returns"></a><h4>Returns</h4>
 <p> the signal id</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-18.html#api-index-2.18">2.18</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-override-class-handler"></a><h3>g_signal_override_class_handler ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_override_class_handler (<em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *signal_name</code></em>,
                                  <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> instance_type</code></em>,
                                  <em class="parameter"><code><a class="link" href="gobject-Closures.html#GCallback" title="GCallback ()"><span class="type">GCallback</span></a> class_handler</code></em>);</pre>
 <p>Overrides the class closure (i.e. the default handler) for the
 given signal for emissions on instances of <em class="parameter"><code>instance_type</code></em>
  with
 callback <em class="parameter"><code>class_handler</code></em>
 . <em class="parameter"><code>instance_type</code></em>
  must be derived from the
 type to which the signal belongs.</p>
 <p>See <a class="link" href="gobject-Signals.html#g-signal-chain-from-overridden" title="g_signal_chain_from_overridden ()"><code class="function">g_signal_chain_from_overridden()</code></a> and
 <a class="link" href="gobject-Signals.html#g-signal-chain-from-overridden-handler" title="g_signal_chain_from_overridden_handler ()"><code class="function">g_signal_chain_from_overridden_handler()</code></a> for how to chain up to the
 parent class closure from inside the overridden one.</p>
 <div class="refsect3">
 <a name="g-signal-override-class-handler.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>signal_name</p></td>
 <td class="parameter_description"><p>the name for the signal</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>instance_type</p></td>
 <td class="parameter_description"><p>the instance type on which to override the class handler
 for the signal.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>class_handler</p></td>
 <td class="parameter_description"><p>the handler.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-18.html#api-index-2.18">2.18</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-chain-from-overridden-handler"></a><h3>g_signal_chain_from_overridden_handler ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_chain_from_overridden_handler
                                (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>,
                                 <em class="parameter"><code>...</code></em>);</pre>
 <p>Calls the original class closure of a signal. This function should
 only be called from an overridden class closure; see
 <a class="link" href="gobject-Signals.html#g-signal-override-class-closure" title="g_signal_override_class_closure ()"><code class="function">g_signal_override_class_closure()</code></a> and
 <a class="link" href="gobject-Signals.html#g-signal-override-class-handler" title="g_signal_override_class_handler ()"><code class="function">g_signal_override_class_handler()</code></a>.</p>
 <p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
 <div class="refsect3">
 <a name="g-signal-chain-from-overridden-handler.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> the instance the signal is being
 emitted on. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.TypeInstance]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>...</p></td>
 <td class="parameter_description"><p>parameters to be passed to the parent class closure, followed by a
 location for the return value. If the return type of the signal
 is <a class="link" href="gobject-Type-Information.html#G-TYPE-NONE:CAPS" title="G_TYPE_NONE"><span class="type">G_TYPE_NONE</span></a>, the return value location can be omitted.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-18.html#api-index-2.18">2.18</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-add-emission-hook"></a><h3>g_signal_add_emission_hook ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gulong"><span class="returnvalue">gulong</span></a>
 g_signal_add_emission_hook (<em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                             <em class="parameter"><code><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> detail</code></em>,
                             <em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalEmissionHook" title="GSignalEmissionHook ()"><span class="type">GSignalEmissionHook</span></a> hook_func</code></em>,
                             <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> hook_data</code></em>,
                             <em class="parameter"><code><a href="../glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> data_destroy</code></em>);</pre>
 <p>Adds an emission hook for a signal, which will get called for any emission
 of that signal, independent of the instance. This is possible only
 for signals which don't have <a class="link" href="gobject-Signals.html#G-SIGNAL-NO-HOOKS:CAPS"><span class="type">G_SIGNAL_NO_HOOKS</span></a> flag set.</p>
 <div class="refsect3">
 <a name="g-signal-add-emission-hook.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>the signal identifier, as returned by <a class="link" href="gobject-Signals.html#g-signal-lookup" title="g_signal_lookup ()"><code class="function">g_signal_lookup()</code></a>.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detail</p></td>
 <td class="parameter_description"><p>the detail on which to call the hook.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>hook_func</p></td>
 <td class="parameter_description"><p>a <a class="link" href="gobject-Signals.html#GSignalEmissionHook" title="GSignalEmissionHook ()"><span class="type">GSignalEmissionHook</span></a> function.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>hook_data</p></td>
 <td class="parameter_description"><p>user data for <em class="parameter"><code>hook_func</code></em>
 .</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>data_destroy</p></td>
 <td class="parameter_description"><p>a <a href="../glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> for <em class="parameter"><code>hook_data</code></em>
 .</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-add-emission-hook.returns"></a><h4>Returns</h4>
 <p> the hook id, for later use with <a class="link" href="gobject-Signals.html#g-signal-remove-emission-hook" title="g_signal_remove_emission_hook ()"><code class="function">g_signal_remove_emission_hook()</code></a>.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-remove-emission-hook"></a><h3>g_signal_remove_emission_hook ()</h3>
 <pre class="programlisting"><span class="returnvalue">void</span>
 g_signal_remove_emission_hook (<em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> signal_id</code></em>,
                                <em class="parameter"><code><a href="../glib-Basic-Types.html#gulong"><span class="type">gulong</span></a> hook_id</code></em>);</pre>
 <p>Deletes an emission hook.</p>
 <div class="refsect3">
 <a name="g-signal-remove-emission-hook.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>signal_id</p></td>
 <td class="parameter_description"><p>the id of the signal</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>hook_id</p></td>
 <td class="parameter_description"><p>the id of the emission hook, as returned by
 <a class="link" href="gobject-Signals.html#g-signal-add-emission-hook" title="g_signal_add_emission_hook ()"><code class="function">g_signal_add_emission_hook()</code></a></p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-parse-name"></a><h3>g_signal_parse_name ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 g_signal_parse_name (<em class="parameter"><code>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *detailed_signal</code></em>,
                      <em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> itype</code></em>,
                      <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> *signal_id_p</code></em>,
                      <em class="parameter"><code><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> *detail_p</code></em>,
                      <em class="parameter"><code><a href="../glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> force_detail_quark</code></em>);</pre>
 <p>Internal function to parse a signal name into its <em class="parameter"><code>signal_id</code></em>

 and <em class="parameter"><code>detail</code></em>
  quark.</p>
 <div class="refsect3">
 <a name="g-signal-parse-name.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>detailed_signal</p></td>
 <td class="parameter_description"><p>a string of the form "signal-name::detail".</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>itype</p></td>
 <td class="parameter_description"><p>The interface/instance type that introduced "signal-name".</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>signal_id_p</p></td>
 <td class="parameter_description"><p> Location to store the signal id. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>detail_p</p></td>
 <td class="parameter_description"><p> Location to store the detail quark. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span></td>
 </tr>
 <tr>
 <td class="parameter_name"><p>force_detail_quark</p></td>
 <td class="parameter_description"><p><a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> forces creation of a <a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> for the detail.</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-parse-name.returns"></a><h4>Returns</h4>
 <p> Whether the signal name could successfully be parsed and <em class="parameter"><code>signal_id_p</code></em>
 and <em class="parameter"><code>detail_p</code></em>
 contain valid return values.</p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-get-invocation-hint"></a><h3>g_signal_get_invocation_hint ()</h3>
 <pre class="programlisting"><a class="link" href="gobject-Signals.html#GSignalInvocationHint" title="struct GSignalInvocationHint"><span class="returnvalue">GSignalInvocationHint</span></a> *
 g_signal_get_invocation_hint (<em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> instance</code></em>);</pre>
 <p>Returns the invocation hint of the innermost signal emission of instance.</p>
 <div class="refsect3">
 <a name="g-signal-get-invocation-hint.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody><tr>
 <td class="parameter_name"><p>instance</p></td>
 <td class="parameter_description"><p> the instance to query. </p></td>
 <td class="parameter_annotations"><span class="annotation">[<acronym title="Override the parsed C type with given type."><span class="acronym">type</span></acronym> GObject.Object]</span></td>
 </tr></tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-get-invocation-hint.returns"></a><h4>Returns</h4>
 <p> the invocation hint of the innermost signal  emission. </p>
 <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-type-cclosure-new"></a><h3>g_signal_type_cclosure_new ()</h3>
 <pre class="programlisting"><a class="link" href="gobject-Closures.html#GClosure" title="struct GClosure"><span class="returnvalue">GClosure</span></a> *
 g_signal_type_cclosure_new (<em class="parameter"><code><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> itype</code></em>,
                             <em class="parameter"><code><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> struct_offset</code></em>);</pre>
 <p>Creates a new closure which invokes the function found at the offset
 <em class="parameter"><code>struct_offset</code></em>
  in the class structure of the interface or classed type
 identified by <em class="parameter"><code>itype</code></em>
 .</p>
 <div class="refsect3">
 <a name="g-signal-type-cclosure-new.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>itype</p></td>
 <td class="parameter_description"><p>the <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> identifier of an interface or classed type</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>struct_offset</p></td>
 <td class="parameter_description"><p>the offset of the member function of <em class="parameter"><code>itype</code></em>
 's class
 structure which is to be invoked by the new closure</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-type-cclosure-new.returns"></a><h4>Returns</h4>
 <p> a new <a class="link" href="gobject-Closures.html#GCClosure" title="struct GCClosure"><span class="type">GCClosure</span></a></p>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-accumulator-first-wins"></a><h3>g_signal_accumulator_first_wins ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 g_signal_accumulator_first_wins (<em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalInvocationHint" title="struct GSignalInvocationHint"><span class="type">GSignalInvocationHint</span></a> *ihint</code></em>,
                                  <em class="parameter"><code><a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> *return_accu</code></em>,
                                  <em class="parameter"><code>const <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> *handler_return</code></em>,
                                  <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> dummy</code></em>);</pre>
 <p>A predefined <a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> for signals intended to be used as a
 hook for application code to provide a particular value.  Usually
 only one such value is desired and multiple handlers for the same
 signal don't make much sense (except for the case of the default
 handler defined in the class structure, in which case you will
 usually want the signal connection to override the class handler).</p>
 <p>This accumulator will use the return value from the first signal
 handler that is run as the return value for the signal and not run
 any further handlers (ie: the first handler "wins").</p>
 <div class="refsect3">
 <a name="g-signal-accumulator-first-wins.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>ihint</p></td>
 <td class="parameter_description"><p>standard <a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> parameter</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>return_accu</p></td>
 <td class="parameter_description"><p>standard <a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> parameter</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>handler_return</p></td>
 <td class="parameter_description"><p>standard <a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> parameter</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dummy</p></td>
 <td class="parameter_description"><p>standard <a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> parameter</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-accumulator-first-wins.returns"></a><h4>Returns</h4>
 <p> standard <a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> result</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="g-signal-accumulator-true-handled"></a><h3>g_signal_accumulator_true_handled ()</h3>
 <pre class="programlisting"><a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
 g_signal_accumulator_true_handled (<em class="parameter"><code><a class="link" href="gobject-Signals.html#GSignalInvocationHint" title="struct GSignalInvocationHint"><span class="type">GSignalInvocationHint</span></a> *ihint</code></em>,
                                    <em class="parameter"><code><a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> *return_accu</code></em>,
                                    <em class="parameter"><code>const <a class="link" href="gobject-Generic-values.html#GValue" title="GValue"><span class="type">GValue</span></a> *handler_return</code></em>,
                                    <em class="parameter"><code><a href="../glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> dummy</code></em>);</pre>
 <p>A predefined <a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> for signals that return a
 boolean values. The behavior that this accumulator gives is
 that a return of <a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> stops the signal emission: no further
 callbacks will be invoked, while a return of <a href="../glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> allows
 the emission to continue. The idea here is that a <a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> return
 indicates that the callback handled the signal, and no further
 handling is needed.</p>
 <div class="refsect3">
 <a name="g-signal-accumulator-true-handled.parameters"></a><h4>Parameters</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="150px" class="parameters_name">
 <col class="parameters_description">
 <col width="200px" class="parameters_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="parameter_name"><p>ihint</p></td>
 <td class="parameter_description"><p>standard <a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> parameter</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>return_accu</p></td>
 <td class="parameter_description"><p>standard <a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> parameter</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>handler_return</p></td>
 <td class="parameter_description"><p>standard <a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> parameter</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 <tr>
 <td class="parameter_name"><p>dummy</p></td>
 <td class="parameter_description"><p>standard <a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> parameter</p></td>
 <td class="parameter_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 <div class="refsect3">
 <a name="g-signal-accumulator-true-handled.returns"></a><h4>Returns</h4>
 <p> standard <a class="link" href="gobject-Signals.html#GSignalAccumulator" title="GSignalAccumulator ()"><span class="type">GSignalAccumulator</span></a> result</p>
 </div>
 <p class="since">Since: <a class="link" href="api-index-2-4.html#api-index-2.4">2.4</a></p>
 </div>
 </div>
 <div class="refsect1">
 <a name="gobject-Signals.other_details"></a><h2>Types and Values</h2>
 <div class="refsect2">
 <a name="GSignalInvocationHint"></a><h3>struct GSignalInvocationHint</h3>
 <pre class="programlisting">struct GSignalInvocationHint {
   guint		signal_id;
   GQuark detail;
   GSignalFlags run_type;
 };
 </pre>
 <p>The <a class="link" href="gobject-Signals.html#GSignalInvocationHint" title="struct GSignalInvocationHint"><span class="type">GSignalInvocationHint</span></a> structure is used to pass on additional information
 to callbacks during a signal emission.</p>
 <div class="refsect3">
 <a name="GSignalInvocationHint.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="struct_members_name">
 <col class="struct_members_description">
 <col width="200px" class="struct_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="struct_member_name"><p><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GSignalInvocationHint.signal-id"></a>signal_id</code></em>;</p></td>
 <td class="struct_member_description"><p>The signal id of the signal invoking the callback</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="../glib-Quarks.html#GQuark"><span class="type">GQuark</span></a> <em class="structfield"><code><a name="GSignalInvocationHint.detail"></a>detail</code></em>;</p></td>
 <td class="struct_member_description"><p>The detail passed on for this emission</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="gobject-Signals.html#GSignalFlags" title="enum GSignalFlags"><span class="type">GSignalFlags</span></a> <em class="structfield"><code><a name="GSignalInvocationHint.run-type"></a>run_type</code></em>;</p></td>
 <td class="struct_member_description"><p>The stage the signal emission is currently in, this
 field will contain one of <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS"><code class="literal">G_SIGNAL_RUN_FIRST</code></a>,
 <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS"><code class="literal">G_SIGNAL_RUN_LAST</code></a> or <a class="link" href="gobject-Signals.html#G-SIGNAL-RUN-CLEANUP:CAPS"><code class="literal">G_SIGNAL_RUN_CLEANUP</code></a>.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GSignalCMarshaller"></a><h3>GSignalCMarshaller</h3>
 <pre class="programlisting">typedef GClosureMarshal			 GSignalCMarshaller;
 </pre>
 <p>This is the signature of marshaller functions, required to marshall
 arrays of parameter values to signal emissions into C language callback
 invocations. It is merely an alias to <a class="link" href="gobject-Closures.html#GClosureMarshal" title="GClosureMarshal ()"><span class="type">GClosureMarshal</span></a> since the <a class="link" href="gobject-Closures.html#GClosure" title="struct GClosure"><span class="type">GClosure</span></a>
 mechanism takes over responsibility of actual function invocation for the
 signal system.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GSignalCVaMarshaller"></a><h3>GSignalCVaMarshaller</h3>
 <pre class="programlisting">typedef GVaClosureMarshal		 GSignalCVaMarshaller;
 </pre>
 <p>This is the signature of va_list marshaller functions, an optional
 marshaller that can be used in some situations to avoid
 marshalling the signal argument into GValues.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GSignalFlags"></a><h3>enum GSignalFlags</h3>
 <p>The signal flags are used to specify a signal's behaviour, the overall
 signal description outlines how especially the RUN flags control the
 stages of a signal emission.</p>
 <div class="refsect3">
 <a name="GSignalFlags.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="enum_members_name">
 <col class="enum_members_description">
 <col width="200px" class="enum_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-RUN-FIRST:CAPS"></a>G_SIGNAL_RUN_FIRST</p></td>
 <td class="enum_member_description">
 <p>Invoke the object method handler in the first emission stage.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-RUN-LAST:CAPS"></a>G_SIGNAL_RUN_LAST</p></td>
 <td class="enum_member_description">
 <p>Invoke the object method handler in the third emission stage.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-RUN-CLEANUP:CAPS"></a>G_SIGNAL_RUN_CLEANUP</p></td>
 <td class="enum_member_description">
 <p>Invoke the object method handler in the last emission stage.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-NO-RECURSE:CAPS"></a>G_SIGNAL_NO_RECURSE</p></td>
 <td class="enum_member_description">
 <p>Signals being emitted for an object while currently being in
  emission for this very object will not be emitted recursively,
  but instead cause the first emission to be restarted.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-DETAILED:CAPS"></a>G_SIGNAL_DETAILED</p></td>
 <td class="enum_member_description">
 <p>This signal supports "::detail" appendices to the signal name
  upon handler connections and emissions.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-ACTION:CAPS"></a>G_SIGNAL_ACTION</p></td>
 <td class="enum_member_description">
 <p>Action signals are signals that may freely be emitted on alive
  objects from user code via <a class="link" href="gobject-Signals.html#g-signal-emit" title="g_signal_emit ()"><code class="function">g_signal_emit()</code></a> and friends, without
  the need of being embedded into extra code that performs pre or
  post emission adjustments on the object. They can also be thought
  of as object methods which can be called generically by
  third-party code.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-NO-HOOKS:CAPS"></a>G_SIGNAL_NO_HOOKS</p></td>
 <td class="enum_member_description">
 <p>No emissions hooks are supported for this signal.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-MUST-COLLECT:CAPS"></a>G_SIGNAL_MUST_COLLECT</p></td>
 <td class="enum_member_description">
 <p>Varargs signal emission will always collect the
   arguments, even if there are no signal handlers connected.  Since 2.30.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-DEPRECATED:CAPS"></a>G_SIGNAL_DEPRECATED</p></td>
 <td class="enum_member_description">
 <p>The signal is deprecated and will be removed
   in a future version. A warning will be generated if it is connected while
   running with G_ENABLE_DIAGNOSTIC=1.  Since 2.32.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GSignalMatchType"></a><h3>enum GSignalMatchType</h3>
 <p>The match types specify what <a class="link" href="gobject-Signals.html#g-signal-handlers-block-matched" title="g_signal_handlers_block_matched ()"><code class="function">g_signal_handlers_block_matched()</code></a>,
 <a class="link" href="gobject-Signals.html#g-signal-handlers-unblock-matched" title="g_signal_handlers_unblock_matched ()"><code class="function">g_signal_handlers_unblock_matched()</code></a> and <a class="link" href="gobject-Signals.html#g-signal-handlers-disconnect-matched" title="g_signal_handlers_disconnect_matched ()"><code class="function">g_signal_handlers_disconnect_matched()</code></a>
 match signals by.</p>
 <div class="refsect3">
 <a name="GSignalMatchType.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="enum_members_name">
 <col class="enum_members_description">
 <col width="200px" class="enum_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-MATCH-ID:CAPS"></a>G_SIGNAL_MATCH_ID</p></td>
 <td class="enum_member_description">
 <p>The signal id must be equal.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-MATCH-DETAIL:CAPS"></a>G_SIGNAL_MATCH_DETAIL</p></td>
 <td class="enum_member_description">
 <p>The signal detail be equal.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-MATCH-CLOSURE:CAPS"></a>G_SIGNAL_MATCH_CLOSURE</p></td>
 <td class="enum_member_description">
 <p>The closure must be the same.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-MATCH-FUNC:CAPS"></a>G_SIGNAL_MATCH_FUNC</p></td>
 <td class="enum_member_description">
 <p>The C closure callback must be the same.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-MATCH-DATA:CAPS"></a>G_SIGNAL_MATCH_DATA</p></td>
 <td class="enum_member_description">
 <p>The closure data must be the same.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-SIGNAL-MATCH-UNBLOCKED:CAPS"></a>G_SIGNAL_MATCH_UNBLOCKED</p></td>
 <td class="enum_member_description">
 <p>Only unblocked signals may matched.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GSignalQuery"></a><h3>struct GSignalQuery</h3>
 <pre class="programlisting">struct GSignalQuery {
   guint		signal_id;
   const gchar  *signal_name;
   GType		itype;
   GSignalFlags signal_flags;
   GType		return_type; /* mangled with G_SIGNAL_TYPE_STATIC_SCOPE flag */
   guint		n_params;
   const GType  *param_types; /* mangled with G_SIGNAL_TYPE_STATIC_SCOPE flag */
 };
 </pre>
 <p>A structure holding in-depth information for a specific signal. It is
 filled in by the <a class="link" href="gobject-Signals.html#g-signal-query" title="g_signal_query ()"><code class="function">g_signal_query()</code></a> function.</p>
 <div class="refsect3">
 <a name="GSignalQuery.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="struct_members_name">
 <col class="struct_members_description">
 <col width="200px" class="struct_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="struct_member_name"><p><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GSignalQuery.signal-id"></a>signal_id</code></em>;</p></td>
 <td class="struct_member_description"><p>The signal id of the signal being queried, or 0 if the
 signal to be queried was unknown.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p>const <a href="../glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *<em class="structfield"><code><a name="GSignalQuery.signal-name"></a>signal_name</code></em>;</p></td>
 <td class="struct_member_description"><p>The signal name.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> <em class="structfield"><code><a name="GSignalQuery.itype"></a>itype</code></em>;</p></td>
 <td class="struct_member_description"><p>The interface/instance type that this signal can be emitted for.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="gobject-Signals.html#GSignalFlags" title="enum GSignalFlags"><span class="type">GSignalFlags</span></a> <em class="structfield"><code><a name="GSignalQuery.signal-flags"></a>signal_flags</code></em>;</p></td>
 <td class="struct_member_description"><p>The signal flags as passed in to <a class="link" href="gobject-Signals.html#g-signal-new" title="g_signal_new ()"><code class="function">g_signal_new()</code></a>.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> <em class="structfield"><code><a name="GSignalQuery.return-type"></a>return_type</code></em>;</p></td>
 <td class="struct_member_description"><p>The return type for user callbacks.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p><a href="../glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GSignalQuery.n-params"></a>n_params</code></em>;</p></td>
 <td class="struct_member_description"><p>The number of parameters that user callbacks take.</p></td>
 <td class="struct_member_annotations"> </td>
 </tr>
 <tr>
 <td class="struct_member_name"><p>const <a class="link" href="gobject-Type-Information.html#GType" title="GType"><span class="type">GType</span></a> *<em class="structfield"><code><a name="GSignalQuery.param-types"></a>param_types</code></em>;</p></td>
 <td class="struct_member_description">
 <p> The individual parameter types for
 user callbacks, note that the effective callback signature is:</p>
 <div class="informalexample">
   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
     <tbody>
       <tr>
         <td class="listing_lines" align="right"><pre>1
 2
 3</pre></td>
         <td class="listing_code"><pre class="programlisting"><span class="normal">@</span><span class="usertype">return_type</span><span class="normal"> </span><span class="function">callback</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">#</span><span class="usertype">gpointer</span><span class="normal">     data1</span><span class="symbol">,</span>
 <span class="symbol">[</span><span class="usertype">param_types</span><span class="normal"> param_names</span><span class="symbol">,]</span>
 <span class="usertype">gpointer</span><span class="normal">     data2</span><span class="symbol">);</span></pre></td>
       </tr>
     </tbody>
   </table>
 </div>

 <p>. </p>
 </td>
 <td class="struct_member_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=n_params]</span></td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-SIGNAL-TYPE-STATIC-SCOPE:CAPS"></a><h3>G_SIGNAL_TYPE_STATIC_SCOPE</h3>
 <pre class="programlisting">#define G_SIGNAL_TYPE_STATIC_SCOPE (G_TYPE_FLAG_RESERVED_ID_BIT)
 </pre>
 <p>This macro flags signal argument types for which the signal system may
 assume that instances thereof remain persistent across all signal emissions
 they are used in. This is only useful for non ref-counted, value-copy types.</p>
 <p>To flag a signal argument in this way, add <code class="literal">| G_SIGNAL_TYPE_STATIC_SCOPE</code>
 to the corresponding argument of <a class="link" href="gobject-Signals.html#g-signal-new" title="g_signal_new ()"><code class="function">g_signal_new()</code></a>.</p>
 <div class="informalexample">
   <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
     <tbody>
       <tr>
         <td class="listing_lines" align="right"><pre>1
 2
 3
 4
 5
 6
 7
 8</pre></td>
         <td class="listing_code"><pre class="programlisting"><span class="function"><a href="gobject-Signals.html#g-signal-new">g_signal_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"size_request"</span><span class="symbol">,</span>
 <span class="normal">  </span><span class="function"><a href="gobject-Type-Information.html#G-TYPE-FROM-CLASS:CAPS">G_TYPE_FROM_CLASS</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">gobject_class</span><span class="symbol">),</span>
 <span class="normal">     <a href="gobject-Signals.html#G-SIGNAL-RUN-FIRST:CAPS">G_SIGNAL_RUN_FIRST</a></span><span class="symbol">,</span>
 <span class="normal">     </span><span class="function"><a href="../glib-Standard-Macros.html#G-STRUCT-OFFSET:CAPS">G_STRUCT_OFFSET</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="http://developer.gnome.org/gtk3/GtkWidget.html#GtkWidgetClass">GtkWidgetClass</a></span><span class="symbol">,</span><span class="normal"> size_request</span><span class="symbol">),</span>
 <span class="normal">     <a href="../glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span><span class="normal"> <a href="../glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">,</span>
 <span class="normal">     _gtk_marshal_VOID__BOXED</span><span class="symbol">,</span>
 <span class="normal">     <a href="gobject-Type-Information.html#G-TYPE-NONE:CAPS">G_TYPE_NONE</a></span><span class="symbol">,</span><span class="normal"> </span><span class="number">1</span><span class="symbol">,</span>
 <span class="normal">     GTK_TYPE_REQUISITION </span><span class="symbol">|</span><span class="normal"> <a href="gobject-Signals.html#G-SIGNAL-TYPE-STATIC-SCOPE:CAPS">G_SIGNAL_TYPE_STATIC_SCOPE</a></span><span class="symbol">);</span></pre></td>
       </tr>
     </tbody>
   </table>
 </div>

 <p></p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-SIGNAL-MATCH-MASK:CAPS"></a><h3>G_SIGNAL_MATCH_MASK</h3>
 <pre class="programlisting">#define G_SIGNAL_MATCH_MASK  0x3f
 </pre>
 <p>A mask for all <a class="link" href="gobject-Signals.html#GSignalMatchType" title="enum GSignalMatchType"><span class="type">GSignalMatchType</span></a> bits.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="G-SIGNAL-FLAGS-MASK:CAPS"></a><h3>G_SIGNAL_FLAGS_MASK</h3>
 <pre class="programlisting">#define G_SIGNAL_FLAGS_MASK  0x1ff
 </pre>
 <p>A mask for all <a class="link" href="gobject-Signals.html#GSignalFlags" title="enum GSignalFlags"><span class="type">GSignalFlags</span></a> bits.</p>
 </div>
 <hr>
 <div class="refsect2">
 <a name="GConnectFlags"></a><h3>enum GConnectFlags</h3>
 <p>The connection flags are used to specify the behaviour of a signal's
 connection.</p>
 <div class="refsect3">
 <a name="GConnectFlags.members"></a><h4>Members</h4>
 <div class="informaltable"><table class="informaltable" width="100%" border="0">
 <colgroup>
 <col width="300px" class="enum_members_name">
 <col class="enum_members_description">
 <col width="200px" class="enum_members_annotations">
 </colgroup>
 <tbody>
 <tr>
 <td class="enum_member_name"><p><a name="G-CONNECT-AFTER:CAPS"></a>G_CONNECT_AFTER</p></td>
 <td class="enum_member_description">
 <p>whether the handler should be called before or after the
  default handler of the signal.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 <tr>
 <td class="enum_member_name"><p><a name="G-CONNECT-SWAPPED:CAPS"></a>G_CONNECT_SWAPPED</p></td>
 <td class="enum_member_description">
 <p>whether the instance and data should be swapped when
  calling the handler; see <a class="link" href="gobject-Signals.html#g-signal-connect-swapped" title="g_signal_connect_swapped()"><code class="function">g_signal_connect_swapped()</code></a> for an example.</p>
 </td>
 <td class="enum_member_annotations"> </td>
 </tr>
 </tbody>
 </table></div>
 </div>
 </div>
 </div>
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