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      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 EditCommand_h
     27 #define EditCommand_h
     28 
     29 #include "core/editing/EditAction.h"
     30 #include "core/editing/VisibleSelection.h"
     31 #include "platform/heap/Handle.h"
     32 
     33 namespace blink {
     34 
     35 class CompositeEditCommand;
     36 class Document;
     37 
     38 class EditCommand : public RefCountedWillBeGarbageCollectedFinalized<EditCommand> {
     39 public:
     40     virtual ~EditCommand();
     41 
     42     void setParent(CompositeEditCommand*);
     43 
     44     virtual EditAction editingAction() const;
     45 
     46     const VisibleSelection& startingSelection() const { return m_startingSelection; }
     47     const VisibleSelection& endingSelection() const { return m_endingSelection; }
     48 
     49     virtual bool isSimpleEditCommand() const { return false; }
     50     virtual bool isCompositeEditCommand() const { return false; }
     51     bool isTopLevelCommand() const { return !m_parent; }
     52 
     53     virtual void doApply() = 0;
     54 
     55     virtual void trace(Visitor*);
     56 
     57 protected:
     58     explicit EditCommand(Document&);
     59     EditCommand(Document*, const VisibleSelection&, const VisibleSelection&);
     60 
     61     Document& document() const { return *m_document.get(); }
     62     CompositeEditCommand* parent() const { return m_parent; }
     63     void setStartingSelection(const VisibleSelection&);
     64     void setStartingSelection(const VisiblePosition&);
     65     void setEndingSelection(const VisibleSelection&);
     66     void setEndingSelection(const VisiblePosition&);
     67 
     68 private:
     69     RefPtrWillBeMember<Document> m_document;
     70     VisibleSelection m_startingSelection;
     71     VisibleSelection m_endingSelection;
     72     RawPtrWillBeMember<CompositeEditCommand> m_parent;
     73 };
     74 
     75 enum ShouldAssumeContentIsAlwaysEditable {
     76     AssumeContentIsAlwaysEditable,
     77     DoNotAssumeContentIsAlwaysEditable,
     78 };
     79 
     80 class SimpleEditCommand : public EditCommand {
     81 public:
     82     virtual void doUnapply() = 0;
     83     virtual void doReapply(); // calls doApply()
     84 
     85 protected:
     86     explicit SimpleEditCommand(Document& document) : EditCommand(document) { }
     87 
     88 private:
     89     virtual bool isSimpleEditCommand() const OVERRIDE FINAL { return true; }
     90 };
     91 
     92 DEFINE_TYPE_CASTS(SimpleEditCommand, EditCommand, command, command->isSimpleEditCommand(), command.isSimpleEditCommand());
     93 
     94 } // namespace blink
     95 
     96 #endif // EditCommand_h
     97