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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 #include "config.h"
     27 #include "FrameActionScheduler.h"
     28 
     29 #include "Event.h"
     30 #include "Node.h"
     31 #include <wtf/Vector.h>
     32 
     33 namespace WebCore {
     34 
     35 class EventFrameAction : public FrameAction {
     36 public:
     37     EventFrameAction(PassRefPtr<Event> event, PassRefPtr<Node> target)
     38         : m_event(event)
     39         , m_eventTarget(target)
     40     {
     41     }
     42 
     43     virtual void fire()
     44     {
     45         // Only dispatch events to nodes that are in the document
     46         ExceptionCode ec = 0;
     47         if (m_eventTarget->inDocument())
     48             m_eventTarget->dispatchEvent(m_event, ec);
     49     }
     50 
     51 private:
     52     RefPtr<Event> m_event;
     53     RefPtr<Node> m_eventTarget;
     54 };
     55 
     56 FrameActionScheduler::FrameActionScheduler()
     57     : m_enqueueActions(0)
     58 {
     59 }
     60 
     61 FrameActionScheduler::~FrameActionScheduler()
     62 {
     63     clear();
     64 }
     65 
     66 bool FrameActionScheduler::isEmpty() const
     67 {
     68     return m_scheduledActions.isEmpty();
     69 }
     70 
     71 void FrameActionScheduler::clear()
     72 {
     73     m_scheduledActions.clear();
     74     m_enqueueActions = 0;
     75 }
     76 
     77 void FrameActionScheduler::pause()
     78 {
     79     ASSERT(isEmpty() || m_enqueueActions);
     80     m_enqueueActions++;
     81 }
     82 
     83 void FrameActionScheduler::resume()
     84 {
     85     m_enqueueActions--;
     86     if (!m_enqueueActions)
     87         dispatch();
     88     ASSERT(isEmpty() || m_enqueueActions);
     89 }
     90 
     91 void FrameActionScheduler::dispatch()
     92 {
     93     Vector< OwnPtr<FrameAction> > snapshot;
     94     m_scheduledActions.swap(snapshot);
     95 
     96     for (Vector< OwnPtr<FrameAction> >::iterator i = snapshot.begin(); i != snapshot.end(); ++i)
     97         (*i)->fire();
     98 }
     99 
    100 void FrameActionScheduler::scheduleAction(PassOwnPtr<FrameAction> action)
    101 {
    102     m_scheduledActions.append(action);
    103 }
    104 
    105 void FrameActionScheduler::scheduleEvent(PassRefPtr<Event> event, PassRefPtr<Node> eventTarget)
    106 {
    107     scheduleAction(new EventFrameAction(event, eventTarget));
    108 }
    109 
    110 
    111 } // namespace WebCore
    112