1 /*
2  * Copyright (C) 2005, 2006, 2008 Apple 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 #ifndef DeleteSelectionCommand_h
27 #define DeleteSelectionCommand_h
28 
29 #include "CompositeEditCommand.h"
30 
31 namespace WebCore {
32 
33 class EditingStyle;
34 
35 class DeleteSelectionCommand : public CompositeEditCommand {
36 public:
37     static PassRefPtr<DeleteSelectionCommand> create(Document* document, bool smartDelete = false, bool mergeBlocksAfterDelete = true, bool replace = false, bool expandForSpecialElements = false)
38     {
39         return adoptRef(new DeleteSelectionCommand(document, smartDelete, mergeBlocksAfterDelete, replace, expandForSpecialElements));
40     }
41     static PassRefPtr<DeleteSelectionCommand> create(const VisibleSelection& selection, bool smartDelete = false, bool mergeBlocksAfterDelete = true, bool replace = false, bool expandForSpecialElements = false)
42     {
43         return adoptRef(new DeleteSelectionCommand(selection, smartDelete, mergeBlocksAfterDelete, replace, expandForSpecialElements));
44     }
45 
46 private:
47     DeleteSelectionCommand(Document*, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements);
48     DeleteSelectionCommand(const VisibleSelection&, bool smartDelete, bool mergeBlocksAfterDelete, bool replace, bool expandForSpecialElements);
49 
50     virtual void doApply();
51     virtual EditAction editingAction() const;
52 
53     virtual bool preservesTypingStyle() const;
54 
55     void initializeStartEnd(Position&, Position&);
56     void setStartingSelectionOnSmartDelete(const Position&, const Position&);
57     void initializePositionData();
58     void saveTypingStyleState();
59     void insertPlaceholderForAncestorBlockContent();
60     bool handleSpecialCaseBRDelete();
61     void handleGeneralDelete();
62     void fixupWhitespace();
63     void mergeParagraphs();
64     void removePreviouslySelectedEmptyTableRows();
65     void calculateEndingPosition();
66     void calculateTypingStyleAfterDelete();
67     void clearTransientState();
68     virtual void removeNode(PassRefPtr<Node>);
69     virtual void deleteTextFromNode(PassRefPtr<Text>, unsigned, unsigned);
70 
71     bool m_hasSelectionToDelete;
72     bool m_smartDelete;
73     bool m_mergeBlocksAfterDelete;
74     bool m_needPlaceholder;
75     bool m_replace;
76     bool m_expandForSpecialElements;
77     bool m_pruneStartBlockIfNecessary;
78     bool m_startsAtEmptyLine;
79 
80     // This data is transient and should be cleared at the end of the doApply function.
81     VisibleSelection m_selectionToDelete;
82     Position m_upstreamStart;
83     Position m_downstreamStart;
84     Position m_upstreamEnd;
85     Position m_downstreamEnd;
86     Position m_endingPosition;
87     Position m_leadingWhitespace;
88     Position m_trailingWhitespace;
89     RefPtr<Node> m_startBlock;
90     RefPtr<Node> m_endBlock;
91     RefPtr<EditingStyle> m_typingStyle;
92     RefPtr<EditingStyle> m_deleteIntoBlockquoteStyle;
93     RefPtr<Node> m_startRoot;
94     RefPtr<Node> m_endRoot;
95     RefPtr<Node> m_startTableRow;
96     RefPtr<Node> m_endTableRow;
97     RefPtr<Node> m_temporaryPlaceholder;
98 };
99 
100 } // namespace WebCore
101 
102 #endif // DeleteSelectionCommand_h
103