| // Copyright 2017 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 CONTENT_RENDERER_INPUT_MAIN_THREAD_EVENT_QUEUE_TASK_LIST_H_ |
| #define CONTENT_RENDERER_INPUT_MAIN_THREAD_EVENT_QUEUE_TASK_LIST_H_ |
| |
| #include <memory> |
| |
| #include "base/containers/circular_deque.h" |
| #include "content/renderer/input/main_thread_event_queue_task.h" |
| |
| namespace content { |
| |
| // The list of tasks that the main thread event queue will execute. |
| // This class supports coalescing upon queueing a task. |
| class MainThreadEventQueueTaskList { |
| public: |
| enum class EnqueueResult { kCoalesced, kEnqueued }; |
| |
| MainThreadEventQueueTaskList(); |
| ~MainThreadEventQueueTaskList(); |
| |
| // Adds an event to the queue. The event may be coalesced with previously |
| // queued events. |
| EnqueueResult Enqueue(std::unique_ptr<MainThreadEventQueueTask> event); |
| std::unique_ptr<MainThreadEventQueueTask> Pop(); |
| |
| const std::unique_ptr<MainThreadEventQueueTask>& front() const { |
| return queue_.front(); |
| } |
| const std::unique_ptr<MainThreadEventQueueTask>& at(size_t pos) const { |
| return queue_.at(pos); |
| } |
| |
| std::unique_ptr<MainThreadEventQueueTask> remove(size_t pos); |
| |
| bool empty() const { return queue_.empty(); } |
| |
| size_t size() const { return queue_.size(); } |
| |
| private: |
| using EventQueue = |
| base::circular_deque<std::unique_ptr<MainThreadEventQueueTask>>; |
| EventQueue queue_; |
| |
| DISALLOW_COPY_AND_ASSIGN(MainThreadEventQueueTaskList); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_RENDERER_INPUT_MAIN_THREAD_EVENT_QUEUE_TASK_LIST_H_ |