File: FrameRequestCallbackCollection.h

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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef FrameRequestCallbackCollection_h
#define FrameRequestCallbackCollection_h

#include "core/CoreExport.h"
#include "platform/heap/Handle.h"

namespace blink {

class ExecutionContext;
class FrameRequestCallback;

class CORE_EXPORT FrameRequestCallbackCollection final {
  DISALLOW_NEW();

 public:
  explicit FrameRequestCallbackCollection(ExecutionContext*);

  using CallbackId = int;
  CallbackId registerCallback(FrameRequestCallback*);
  void cancelCallback(CallbackId);
  void executeCallbacks(double highResNowMs, double highResNowMsLegacy);

  bool isEmpty() const { return !m_callbacks.size(); }

  DECLARE_TRACE();

 private:
  using CallbackList = HeapVector<Member<FrameRequestCallback>>;
  CallbackList m_callbacks;
  CallbackList
      m_callbacksToInvoke;  // only non-empty while inside executeCallbacks

  CallbackId m_nextCallbackId = 0;

  Member<ExecutionContext> m_context;
};

}  // namespace blink

#endif  // FrameRequestCallbackCollection_h