third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.h

/*
 * Copyright (C) 2005, 2006, 2008 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
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef DeleteSelectionCommand_h
#define DeleteSelectionCommand_h

#include "core/editing/commands/CompositeEditCommand.h"

namespace blink {

class EditingStyle;
class HTMLTableRowElement;

class DeleteSelectionCommand final : public CompositeEditCommand {
 public:
  static DeleteSelectionCommand* create(
      Document& document,
      bool smartDelete = false,
      bool mergeBlocksAfterDelete = true,
      bool expandForSpecialElements = false,
      bool sanitizeMarkup = true,
      InputEvent::InputType inputType = InputEvent::InputType::None,
      const Position& referenceMovePosition = Position()) {
    return new DeleteSelectionCommand(
        document, smartDelete, mergeBlocksAfterDelete, expandForSpecialElements,
        sanitizeMarkup, inputType, referenceMovePosition);
  }
  static DeleteSelectionCommand* create(
      const VisibleSelection& selection,
      bool smartDelete = false,
      bool mergeBlocksAfterDelete = true,
      bool expandForSpecialElements = false,
      bool sanitizeMarkup = true,
      InputEvent::InputType inputType = InputEvent::InputType::None) {
    return new DeleteSelectionCommand(
        selection, smartDelete, mergeBlocksAfterDelete,
        expandForSpecialElements, sanitizeMarkup, inputType);
  }

  DECLARE_VIRTUAL_TRACE();

 private:
  DeleteSelectionCommand(Document&,
                         bool smartDelete,
                         bool mergeBlocksAfterDelete,
                         bool expandForSpecialElements,
                         bool santizeMarkup,
                         InputEvent::InputType,
                         const Position& referenceMovePosition);
  DeleteSelectionCommand(const VisibleSelection&,
                         bool smartDelete,
                         bool mergeBlocksAfterDelete,
                         bool expandForSpecialElements,
                         bool sanitizeMarkup,
                         InputEvent::InputType);

  void doApply(EditingState*) override;
  InputEvent::InputType inputType() const override;

  bool preservesTypingStyle() const override;

  void initializeStartEnd(Position&, Position&);
  void setStartingSelectionOnSmartDelete(const Position&, const Position&);
  void initializePositionData(EditingState*);
  void saveTypingStyleState();
  bool handleSpecialCaseBRDelete(EditingState*);
  void handleGeneralDelete(EditingState*);
  void fixupWhitespace();
  void mergeParagraphs(EditingState*);
  void removePreviouslySelectedEmptyTableRows(EditingState*);
  void calculateTypingStyleAfterDelete();
  void clearTransientState();
  void makeStylingElementsDirectChildrenOfEditableRootToPreventStyleLoss(
      EditingState*);
  void removeNode(Node*,
                  EditingState*,
                  ShouldAssumeContentIsAlwaysEditable =
                      DoNotAssumeContentIsAlwaysEditable) override;
  void deleteTextFromNode(Text*, unsigned, unsigned) override;
  void removeRedundantBlocks(EditingState*);

  bool m_hasSelectionToDelete;
  bool m_smartDelete;
  bool m_mergeBlocksAfterDelete;
  bool m_needPlaceholder;
  bool m_expandForSpecialElements;
  bool m_pruneStartBlockIfNecessary;
  bool m_startsAtEmptyLine;
  bool m_sanitizeMarkup;
  InputEvent::InputType m_inputType;

  // This data is transient and should be cleared at the end of the doApply
  // function.
  VisibleSelection m_selectionToDelete;
  Position m_upstreamStart;
  Position m_downstreamStart;
  Position m_upstreamEnd;
  Position m_downstreamEnd;
  Position m_endingPosition;
  Position m_leadingWhitespace;
  Position m_trailingWhitespace;
  Position m_referenceMovePosition;
  Member<Node> m_startBlock;
  Member<Node> m_endBlock;
  Member<EditingStyle> m_typingStyle;
  Member<EditingStyle> m_deleteIntoBlockquoteStyle;
  Member<Element> m_startRoot;
  Member<Element> m_endRoot;
  Member<HTMLTableRowElement> m_startTableRow;
  Member<HTMLTableRowElement> m_endTableRow;
  Member<Node> m_temporaryPlaceholder;
};

}  // namespace blink

#endif  // DeleteSelectionCommand_h