chromium/src/third_party/blink/renderer/core/editing/commands/edit_command.cc

/*
 * Copyright (C) 2005, 2006, 2007 Apple, Inc.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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#include "third_party/blink/renderer/core/editing/commands/edit_command.h"

#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/node_traversal.h"
#include "third_party/blink/renderer/core/editing/commands/composite_edit_command.h"
#include "third_party/blink/renderer/core/editing/frame_selection.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/layout/layout_text.h"
#include "third_party/blink/renderer/core/layout/line/inline_text_box.h"
#include "third_party/blink/renderer/core/layout/ng/inline/ng_offset_mapping.h"

namespace blink {

EditCommand::EditCommand(Document& document)
    : document_(&document), parent_(nullptr) {
  DCHECK(document_);
  DCHECK(document_->GetFrame());
}

EditCommand::~EditCommand() = default;

InputEvent::InputType EditCommand::GetInputType() const {
  return InputEvent::InputType::kNone;
}

String EditCommand::TextDataForInputEvent() const {
  return g_null_atom;
}

bool EditCommand::IsRenderedCharacter(const Position& position) {
  if (position.IsNull())
    return false;
  DCHECK(position.IsOffsetInAnchor()) << position;

  const Node& node = *position.AnchorNode();
  if (!node.IsTextNode())
    return false;

  LayoutObject* layout_object = node.GetLayoutObject();
  if (!layout_object || !layout_object->IsText())
    return false;

  // Use NG offset mapping when LayoutNG is enabled.
  if (auto* mapping = NGOffsetMapping::GetFor(position)) {
    return mapping->IsBeforeNonCollapsedContent(position);
  }

  // TODO(editing-dev): This doesn't handle first-letter correctly. Fix it.
  const auto* layout_text = To<LayoutText>(layout_object);
  const int offset_in_node = position.OffsetInContainerNode();
  for (InlineTextBox* box : layout_text->TextBoxes()) {
    if (offset_in_node < static_cast<int>(box->Start()) &&
        !layout_text->ContainsReversedText()) {
      // The offset we're looking for is before this node this means the offset
      // must be in content that is not laid out. Return false.
      return false;
    }
    if (offset_in_node >= static_cast<int>(box->Start()) &&
        offset_in_node < static_cast<int>(box->Start() + box->Len()))
      return true;
  }

  return false;
}

void EditCommand::SetParent(CompositeEditCommand* parent) {
  DCHECK((parent && !parent_) || (!parent && parent_));
  auto* composite_edit_command = DynamicTo<CompositeEditCommand>(this);
  DCHECK(!parent || !composite_edit_command ||
         !composite_edit_command->GetUndoStep());
  parent_ = parent;
}

void SimpleEditCommand::DoReapply() {
  EditingState editing_state;
  DoApply(&editing_state);
}

void EditCommand::Trace(Visitor* visitor) const {
  visitor->Trace(document_);
  visitor->Trace(parent_);
}

}  // namespace blink