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| <TITLE>menu_driver 3x</TITLE> |
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| <H1>menu_driver 3x</H1> |
| <HR> |
| <PRE> |
| <!-- Manpage converted by man2html 3.0.1 --> |
| <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG> <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG> |
| |
| |
| |
| |
| </PRE> |
| <H2>NAME</H2><PRE> |
| <STRONG>menu_driver</STRONG> - command-processing loop of the menu system |
| |
| |
| </PRE> |
| <H2>SYNOPSIS</H2><PRE> |
| <STRONG>#include</STRONG> <STRONG><menu.h></STRONG> |
| int menu_driver(MENU *menu, int c); |
| |
| |
| </PRE> |
| <H2>DESCRIPTION</H2><PRE> |
| Once a menu has been posted (displayed), you should funnel |
| input events to it through <STRONG>menu_driver</STRONG>. This routine has |
| three major input cases: |
| |
| - The input is a form navigation request. Navigation |
| request codes are constants defined in <STRONG><form.h></STRONG>, which |
| are distinct from the key- and character codes returned |
| by <STRONG>wgetch</STRONG>. |
| |
| - The input is a printable character. Printable charac- |
| ters (which must be positive, less than 256) are |
| checked according to the program's locale settings. |
| |
| - The input is the KEY_MOUSE special key associated with |
| an mouse event. |
| |
| The menu driver requests are as follows: |
| |
| REQ_LEFT_ITEM |
| Move left to an item. |
| |
| REQ_RIGHT_ITEM |
| Move right to an item. |
| |
| REQ_UP_ITEM |
| Move up to an item. |
| |
| REQ_DOWN_ITEM |
| Move down to an item. |
| |
| REQ_SCR_ULINE |
| Scroll up a line. |
| |
| REQ_SCR_DLINE |
| Scroll down a line. |
| |
| REQ_SCR_DPAGE |
| Scroll down a page. |
| |
| REQ_SCR_UPAGE |
| Scroll up a page. |
| |
| REQ_FIRST_ITEM |
| Move to the first item. |
| |
| REQ_LAST_ITEM |
| Move to the last item. |
| |
| REQ_NEXT_ITEM |
| Move to the next item. |
| |
| REQ_PREV_ITEM |
| Move to the previous item. |
| |
| REQ_TOGGLE_ITEM |
| Select/deselect an item. |
| |
| REQ_CLEAR_PATTERN |
| Clear the menu pattern buffer. |
| |
| REQ_BACK_PATTERN |
| Delete the previous character from the pattern |
| buffer. |
| |
| REQ_NEXT_MATCH |
| Move to the next item matching the pattern match. |
| |
| REQ_PREV_MATCH |
| Move to the previous item matching the pattern match. |
| |
| If the second argument is a printable character, the code |
| appends it to the pattern buffer and attempts to move to |
| the next item matching the new pattern. If there is no |
| such match, <STRONG>menu_driver</STRONG> returns <STRONG>E_NO_MATCH</STRONG> and deletes the |
| appended character from the buffer. |
| |
| If the second argument is one of the above pre-defined |
| requests, the corresponding action is performed. |
| |
| <STRONG>MOUSE</STRONG> <STRONG>HANDLING</STRONG> |
| If the second argument is the KEY_MOUSE special key, the |
| associated mouse event is translated into one of the above |
| pre-defined requests. Currently only clicks in the user |
| window (e.g. inside the menu display area or the decora- |
| tion window) are handled. |
| |
| If you click above the display region of the menu: |
| |
| a REQ_SCR_ULINE is generated for a single click, |
| |
| a REQ_SCR_UPAGE is generated for a double-click and |
| |
| a REQ_FIRST_ITEM is generated for a triple-click. |
| |
| If you click below the display region of the menu: |
| |
| a REQ_SCR_DLINE is generated for a single click, |
| |
| a REQ_SCR_DPAGE is generated for a double-click and |
| |
| a REQ_LAST_ITEM is generated for a triple-click. |
| |
| If you click at an item inside the display area of the |
| menu: |
| |
| - the menu cursor is positioned to that item. |
| |
| - If you double-click an item a REQ_TOGGLE_ITEM is |
| generated and <STRONG>E_UNKNOWN_COMMAND</STRONG> is returned. |
| This return value makes sense, because a double |
| click usually means that an item-specific action |
| should be returned. It is exactly the purpose |
| of this return value to signal that an applica- |
| tion specific command should be executed. |
| |
| - If a translation into a request was done, |
| <STRONG>menu_driver</STRONG> returns the result of this request. |
| |
| If you clicked outside the user window or the mouse event |
| could not be translated into a menu request an |
| <STRONG>E_REQUEST_DENIED</STRONG> is returned. |
| |
| <STRONG>APPLICATION-DEFINED</STRONG> <STRONG>COMMANDS</STRONG> |
| If the second argument is neither printable nor one of the |
| above pre-defined menu requests or KEY_MOUSE, the drive |
| assumes it is an application-specific command and returns |
| <STRONG>E_UNKNOWN_COMMAND</STRONG>. Application-defined commands should be |
| defined relative to <STRONG>MAX_COMMAND</STRONG>, the maximum value of |
| these pre-defined requests. |
| |
| |
| </PRE> |
| <H2>RETURN VALUE</H2><PRE> |
| <STRONG>menu_driver</STRONG> return one of the following error codes: |
| |
| <STRONG>E_OK</STRONG> The routine succeeded. |
| |
| <STRONG>E_SYSTEM_ERROR</STRONG> |
| System error occurred (see <STRONG>errno</STRONG>). |
| |
| <STRONG>E_BAD_ARGUMENT</STRONG> |
| Routine detected an incorrect or out-of-range argu- |
| ment. |
| |
| <STRONG>E_BAD_STATE</STRONG> |
| Routine was called from an initialization or termina- |
| tion function. |
| |
| <STRONG>E_NOT_POSTED</STRONG> |
| The menu has not been posted. |
| |
| <STRONG>E_UNKNOWN_COMMAND</STRONG> |
| The menu driver code saw an unknown request code. |
| |
| <STRONG>E_NO_MATCH</STRONG> |
| Character failed to match. |
| |
| <STRONG>E_REQUEST_DENIED</STRONG> |
| The menu driver could not process the request. |
| |
| |
| </PRE> |
| <H2>SEE ALSO</H2><PRE> |
| <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="menu.3x.html">menu(3x)</A></STRONG>, <STRONG><A HREF="wgetch.3x.html">wgetch(3x)</A></STRONG>. |
| |
| |
| </PRE> |
| <H2>NOTES</H2><PRE> |
| The header file <STRONG><menu.h></STRONG> automatically includes the header |
| files <STRONG><curses.h></STRONG>. |
| |
| |
| </PRE> |
| <H2>PORTABILITY</H2><PRE> |
| These routines emulate the System V menu library. They |
| were not supported on Version 7 or BSD versions. The sup- |
| port for mouse events is ncurses specific. |
| |
| |
| </PRE> |
| <H2>AUTHORS</H2><PRE> |
| Juergen Pfeifer. Manual pages and adaptation for new |
| curses by Eric S. Raymond. |
| |
| |
| |
| <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG> |
| </PRE> |
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