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// Copyright 2016 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_INPUT_COMPOSITOR_THREAD_EVENT_QUEUE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_INPUT_COMPOSITOR_THREAD_EVENT_QUEUE_H_
#include <memory>
#include "base/containers/circular_deque.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/widget/input/event_with_callback.h"
namespace blink {
namespace test {
class InputHandlerProxyEventQueueTest;
}
// CompositorThreadEventQueue is a coalescing queue. It will examine
// the current events in the queue and will attempt to coalesce with
// the last event.
class PLATFORM_EXPORT CompositorThreadEventQueue {
public:
CompositorThreadEventQueue();
~CompositorThreadEventQueue();
// Adds an event to the queue. The event may be coalesced with the last event.
void Queue(std::unique_ptr<EventWithCallback> event,
base::TimeTicks timestamp_now);
std::unique_ptr<EventWithCallback> Pop();
bool empty() const { return queue_.empty(); }
size_t size() const { return queue_.size(); }
private:
friend class test::InputHandlerProxyEventQueueTest;
using EventQueue = base::circular_deque<std::unique_ptr<EventWithCallback>>;
EventQueue queue_;
DISALLOW_COPY_AND_ASSIGN(CompositorThreadEventQueue);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WIDGET_INPUT_COMPOSITOR_THREAD_EVENT_QUEUE_H_
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