2 * Copyright (C) 2010 Julien Chaffraix <jchaffraix@webkit.org>
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27 #ifndef XMLHttpRequestProgressEventThrottle_h
28 #define XMLHttpRequestProgressEventThrottle_h
30 #include "platform/Timer.h"
31 #include "platform/heap/Handle.h"
32 #include "wtf/PassRefPtr.h"
33 #include "wtf/Vector.h"
34 #include "wtf/text/AtomicString.h"
41 enum ProgressEventAction {
42 DoNotFlushProgressEvent,
43 FlushDeferredProgressEvent,
47 // This implements the XHR2 progress event dispatching: "dispatch a progress event called progress
48 // about every 50ms or for every byte received, whichever is least frequent".
49 class XMLHttpRequestProgressEventThrottle FINAL : public TimerBase {
50 DISALLOW_ALLOCATION();
52 explicit XMLHttpRequestProgressEventThrottle(EventTarget*);
53 virtual ~XMLHttpRequestProgressEventThrottle();
55 // Dispatches a ProgressEvent.
57 // Special treatment for events named "progress" is implemented to dispatch
58 // them at the required frequency. If this object is suspended, the given
59 // ProgressEvent overwrites the existing. I.e. only the latest one gets
60 // queued. If the timer is running, this method just updates
61 // m_lengthComputable, m_loaded and m_total. They'll be used on next
63 void dispatchProgressEvent(const AtomicString&, bool lengthComputable, unsigned long long loaded, unsigned long long total);
64 void dispatchReadyStateChangeEvent(PassRefPtrWillBeRawPtr<Event>, ProgressEventAction = DoNotFlushProgressEvent);
72 static const double minimumProgressEventDispatchingIntervalInSeconds;
74 // Dispatches an event. If suspended, just queues the given event.
75 void dispatchEvent(PassRefPtrWillBeRawPtr<Event>);
77 virtual void fired() OVERRIDE;
78 void dispatchDeferredEvents(Timer<XMLHttpRequestProgressEventThrottle>*);
79 bool flushDeferredProgressEvent();
80 void deliverProgressEvent();
82 bool hasEventToDispatch() const;
84 // Non-Oilpan, keep a weak pointer to our XMLHttpRequest object as it is
85 // the one holding us. With Oilpan, a simple strong Member can be used -
86 // this XMLHttpRequestProgressEventThrottle (part) object dies together
87 // with the XMLHttpRequest object.
88 RawPtrWillBeMember<EventTarget> m_target;
90 bool m_lengthComputable;
91 unsigned long long m_loaded;
92 unsigned long long m_total;
95 RefPtrWillBeMember<Event> m_deferredProgressEvent;
96 WillBeHeapVector<RefPtrWillBeMember<Event> > m_deferredEvents;
97 Timer<XMLHttpRequestProgressEventThrottle> m_dispatchDeferredEventsTimer;
102 #endif // XMLHttpRequestProgressEventThrottle_h