1 /* 2 * Copyright (C) 2009 Google 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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef UndoStack_h 32 #define UndoStack_h 33 34 #include "platform/heap/Handle.h" 35 #include "wtf/Deque.h" 36 #include "wtf/Forward.h" 37 38 namespace WebCore { 39 40 class LocalFrame; 41 class UndoStep; 42 43 class UndoStack FINAL : public NoBaseWillBeGarbageCollected<UndoStack> { 44 DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(UndoStack) 45 public: 46 static PassOwnPtrWillBeRawPtr<UndoStack> create(); 47 48 void registerUndoStep(PassRefPtrWillBeRawPtr<UndoStep>); 49 void registerRedoStep(PassRefPtrWillBeRawPtr<UndoStep>); 50 void didUnloadFrame(const LocalFrame&); 51 bool canUndo() const; 52 bool canRedo() const; 53 void undo(); 54 void redo(); 55 56 void trace(Visitor*); 57 58 private: 59 UndoStack(); 60 61 typedef WillBeHeapDeque<RefPtrWillBeMember<UndoStep> > UndoStepStack; 62 63 void filterOutUndoSteps(UndoStepStack&, const LocalFrame&); 64 65 bool m_inRedo; 66 UndoStepStack m_undoStack; 67 UndoStepStack m_redoStack; 68 }; 69 70 } // namespace WebCore 71 72 #endif 73
