WebCore/editing/MoveSelectionCommand.cpp

   1 /*
   2  * Copyright (C) 2005, 2006 Apple Computer, Inc.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "MoveSelectionCommand.h"
  28
  29 #include "DocumentFragment.h"
  30 #include "ReplaceSelectionCommand.h"
  31
  32 namespace WebCore {
  33
  34 MoveSelectionCommand::MoveSelectionCommand(PassRefPtr<DocumentFragment> fragment, const Position& position, bool smartMove)
  35     : CompositeEditCommand(position.node()->document()), m_fragment(fragment), m_position(position), m_smartMove(smartMove)
  36 {
  37     ASSERT(m_fragment);
  38 }
  39
  40 void MoveSelectionCommand::doApply()
  41 {
  42     Selection selection = endingSelection();
  43     ASSERT(selection.isRange());
  44
  45     Position pos = m_position;
  46     if (pos.isNull())
  47         return;
  48
  49     // Update the position otherwise it may become invalid after the selection is deleted.
  50     Node *positionNode = m_position.node();
  51     int positionOffset = m_position.offset();
  52     Position selectionEnd = selection.end();
  53     int selectionEndOffset = selectionEnd.offset();
  54     if (selectionEnd.node() == positionNode && selectionEndOffset < positionOffset) {
  55         positionOffset -= selectionEndOffset;
  56         Position selectionStart = selection.start();
  57         if (selectionStart.node() == positionNode) {
  58             positionOffset += selectionStart.offset();
  59         }
  60         pos = Position(positionNode, positionOffset);
  61     }
  62
  63     deleteSelection(m_smartMove);
  64
  65     // If the node for the destination has been removed as a result of the deletion,
  66     // set the destination to the ending point after the deletion.
  67     // Fixes: <rdar://problem/3910425> REGRESSION (Mail): Crash in ReplaceSelectionCommand;
  68     //        selection is empty, leading to null deref
  69     if (!pos.node()->inDocument())
  70         pos = endingSelection().start();
  71
  72     setEndingSelection(Selection(pos, endingSelection().affinity()));
  73     applyCommandToComposite(ReplaceSelectionCommand::create(positionNode->document(), m_fragment, true, m_smartMove));
  74 }
  75
  76 EditAction MoveSelectionCommand::editingAction() const
  77 {
  78     return EditActionDrag;
  79 }
  80
  81 } // namespace WebCore