third_party/WebKit/Source/core/dom/FrameRequestCallbackCollection.h

   1 // Copyright 2015 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 FrameRequestCallbackCollection_h
   6 #define FrameRequestCallbackCollection_h
   7
   8 #include "core/CoreExport.h"
   9 #include "platform/heap/Handle.h"
  10
  11 namespace blink {
  12
  13 class ExecutionContext;
  14 class FrameRequestCallback;
  15
  16 class CORE_EXPORT FrameRequestCallbackCollection final {
  17     DISALLOW_ALLOCATION();
  18 public:
  19     explicit FrameRequestCallbackCollection(ExecutionContext*);
  20
  21     using CallbackId = int;
  22     CallbackId registerCallback(FrameRequestCallback*);
  23     void cancelCallback(CallbackId);
  24     void executeCallbacks(double highResNowMs, double highResNowMsLegacy);
  25
  26     bool isEmpty() const { return !m_callbacks.size(); }
  27
  28     DECLARE_TRACE();
  29
  30 private:
  31     using CallbackList = PersistentHeapVectorWillBeHeapVector<Member<FrameRequestCallback>>;
  32     CallbackList m_callbacks;
  33     CallbackList m_callbacksToInvoke; // only non-empty while inside executeCallbacks
  34
  35     CallbackId m_nextCallbackId = 0;
  36
  37     RawPtrWillBeMember<ExecutionContext> m_context;
  38 };
  39
  40 } // namespace blink
  41
  42 #endif // FrameRequestCallbackCollection_h