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      1 /*
      2  * Copyright (C) 2011 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
      6  * are met:
      7  *  * Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  *  * 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 THE COPYRIGHT HOLDERS ``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 THE COPYRIGHT OWNER 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 FrameActionScheduler_h
     27 #define FrameActionScheduler_h
     28 
     29 #include <wtf/FastAllocBase.h>
     30 #include <wtf/Noncopyable.h>
     31 #include <wtf/OwnPtr.h>
     32 #include <wtf/PassOwnPtr.h>
     33 #include <wtf/Vector.h>
     34 
     35 namespace WebCore {
     36 
     37 class Node;
     38 class Event;
     39 
     40 class FrameAction {
     41     WTF_MAKE_FAST_ALLOCATED;
     42     WTF_MAKE_NONCOPYABLE(FrameAction);
     43 public:
     44     FrameAction() {}
     45     virtual ~FrameAction() {}
     46     virtual void fire() = 0;
     47 };
     48 
     49 class FrameActionScheduler {
     50 public:
     51     FrameActionScheduler();
     52     ~FrameActionScheduler();
     53 
     54     bool isEmpty() const;
     55     bool isScheduled() const { return 0 < m_enqueueActions; }
     56     void clear();
     57     void pause();
     58     void resume();
     59 
     60     void scheduleAction(PassOwnPtr<FrameAction>);
     61     void scheduleEvent(PassRefPtr<Event>, PassRefPtr<Node>);
     62 
     63 private:
     64     void dispatch();
     65 
     66     unsigned m_enqueueActions;
     67     Vector< OwnPtr<FrameAction> > m_scheduledActions;
     68 };
     69 
     70 } // namespace WebCore
     71 
     72 #endif // FrameActionScheduler_h
     73