src/third_party/WebKit/Source/core/dom/custom/CustomElementMicrotaskDispatcher.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CustomElementMicrotaskDispatcher_h
   6 #define CustomElementMicrotaskDispatcher_h
   7
   8 #include "platform/heap/Handle.h"
   9 #include "wtf/Noncopyable.h"
  10 #include "wtf/PassOwnPtr.h"
  11 #include "wtf/Vector.h"
  12
  13 namespace blink {
  14
  15 class CustomElementCallbackQueue;
  16
  17 class CustomElementMicrotaskDispatcher final : public NoBaseWillBeGarbageCollected<CustomElementMicrotaskDispatcher> {
  18     WTF_MAKE_NONCOPYABLE(CustomElementMicrotaskDispatcher);
  19     DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(CustomElementMicrotaskDispatcher);
  20 public:
  21     static CustomElementMicrotaskDispatcher& instance();
  22
  23     void enqueue(CustomElementCallbackQueue*);
  24
  25     bool elementQueueIsEmpty() { return m_elements.isEmpty(); }
  26
  27     void trace(Visitor*);
  28
  29 private:
  30     CustomElementMicrotaskDispatcher();
  31
  32     void ensureMicrotaskScheduledForElementQueue();
  33     void ensureMicrotaskScheduled();
  34
  35     static void dispatch();
  36     void doDispatch();
  37
  38     bool m_hasScheduledMicrotask;
  39     enum {
  40         Quiescent,
  41         Resolving,
  42         DispatchingCallbacks
  43     } m_phase;
  44
  45     WillBeHeapVector<RawPtrWillBeMember<CustomElementCallbackQueue> > m_elements;
  46 };
  47
  48 } // namespace blink
  49
  50 #endif // CustomElementMicrotaskDispatcher_h