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      1 /*
      2  * Copyright (C) 2012 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 InspectorHistory_h
     32 #define InspectorHistory_h
     33 
     34 #include "platform/heap/Handle.h"
     35 #include "wtf/RefPtr.h"
     36 #include "wtf/Vector.h"
     37 #include "wtf/text/WTFString.h"
     38 
     39 namespace WebCore {
     40 
     41 class ExceptionState;
     42 
     43 class InspectorHistory FINAL : public NoBaseWillBeGarbageCollected<InspectorHistory> {
     44     WTF_MAKE_NONCOPYABLE(InspectorHistory);
     45     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     46 public:
     47     class Action : public RefCountedWillBeGarbageCollectedFinalized<Action> {
     48         WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     49     public:
     50         explicit Action(const String& name);
     51         virtual ~Action();
     52         virtual void trace(Visitor*);
     53         virtual String toString();
     54 
     55         virtual String mergeId();
     56         virtual void merge(PassRefPtrWillBeRawPtr<Action>);
     57 
     58         virtual bool perform(ExceptionState&) = 0;
     59 
     60         virtual bool undo(ExceptionState&) = 0;
     61         virtual bool redo(ExceptionState&) = 0;
     62 
     63         virtual bool isUndoableStateMark();
     64     private:
     65         String m_name;
     66     };
     67 
     68     InspectorHistory();
     69     void trace(Visitor*);
     70 
     71     bool perform(PassRefPtrWillBeRawPtr<Action>, ExceptionState&);
     72     void markUndoableState();
     73 
     74     bool undo(ExceptionState&);
     75     bool redo(ExceptionState&);
     76     void reset();
     77 
     78 private:
     79     WillBeHeapVector<RefPtrWillBeMember<Action> > m_history;
     80     size_t m_afterLastActionIndex;
     81 };
     82 
     83 
     84 } // namespace WebCore
     85 
     86 #endif // !defined(InspectorHistory_h)
     87