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      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
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     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 "core/editing/MoveSelectionCommand.h"
     28 
     29 #include "core/dom/DocumentFragment.h"
     30 #include "core/editing/ReplaceSelectionCommand.h"
     31 
     32 namespace WebCore {
     33 
     34 MoveSelectionCommand::MoveSelectionCommand(PassRefPtrWillBeRawPtr<DocumentFragment> fragment, const Position& position, bool smartInsert, bool smartDelete)
     35     : CompositeEditCommand(*position.document()), m_fragment(fragment), m_position(position), m_smartInsert(smartInsert), m_smartDelete(smartDelete)
     36 {
     37     ASSERT(m_fragment);
     38 }
     39 
     40 void MoveSelectionCommand::doApply()
     41 {
     42     ASSERT(endingSelection().isNonOrphanedRange());
     43 
     44     Position pos = m_position;
     45     if (pos.isNull())
     46         return;
     47 
     48     // Update the position otherwise it may become invalid after the selection is deleted.
     49     Position selectionEnd = endingSelection().end();
     50     if (pos.anchorType() == Position::PositionIsOffsetInAnchor && selectionEnd.anchorType() == Position::PositionIsOffsetInAnchor
     51         && selectionEnd.containerNode() == pos.containerNode() && selectionEnd.offsetInContainerNode() < pos.offsetInContainerNode()) {
     52         pos.moveToOffset(pos.offsetInContainerNode() - selectionEnd.offsetInContainerNode());
     53 
     54         Position selectionStart = endingSelection().start();
     55         if (selectionStart.anchorType() == Position::PositionIsOffsetInAnchor && selectionStart.containerNode() == pos.containerNode())
     56             pos.moveToOffset(pos.offsetInContainerNode() + selectionStart.offsetInContainerNode());
     57     }
     58 
     59     deleteSelection(m_smartDelete);
     60 
     61     // If the node for the destination has been removed as a result of the deletion,
     62     // set the destination to the ending point after the deletion.
     63     // Fixes: <rdar://problem/3910425> REGRESSION (Mail): Crash in ReplaceSelectionCommand;
     64     //        selection is empty, leading to null deref
     65     if (!pos.inDocument())
     66         pos = endingSelection().start();
     67 
     68     cleanupAfterDeletion(VisiblePosition(pos));
     69 
     70     setEndingSelection(VisibleSelection(pos, endingSelection().affinity(), endingSelection().isDirectional()));
     71     if (!pos.inDocument()) {
     72         // Document was modified out from under us.
     73         return;
     74     }
     75     ReplaceSelectionCommand::CommandOptions options = ReplaceSelectionCommand::SelectReplacement | ReplaceSelectionCommand::PreventNesting;
     76     if (m_smartInsert)
     77         options |= ReplaceSelectionCommand::SmartReplace;
     78     applyCommandToComposite(ReplaceSelectionCommand::create(document(), m_fragment, options));
     79 }
     80 
     81 EditAction MoveSelectionCommand::editingAction() const
     82 {
     83     return EditActionDrag;
     84 }
     85 
     86 void MoveSelectionCommand::trace(Visitor* visitor)
     87 {
     88     visitor->trace(m_fragment);
     89     visitor->trace(m_position);
     90     CompositeEditCommand::trace(visitor);
     91 }
     92 
     93 } // namespace WebCore
     94