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59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef FLUTTER_SHELL_PLATFORM_WINDOWS_TASK_RUNNER_H_
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#define FLUTTER_SHELL_PLATFORM_WINDOWS_TASK_RUNNER_H_
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#include <windows.h>
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#include <chrono>
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#include <memory>
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#include "flutter/shell/platform/embedder/embedder.h"
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namespace flutter {
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typedef uint64_t (*CurrentTimeProc)();
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// Abstract custom task runner for scheduling custom tasks.
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class TaskRunner {
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public:
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using TaskTimePoint = std::chrono::steady_clock::time_point;
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using TaskExpiredCallback = std::function<void(const FlutterTask*)>;
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using TaskClosure = std::function<void()>;
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virtual ~TaskRunner() = default;
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// Returns if the current thread is the UI thread.
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virtual bool RunsTasksOnCurrentThread() const = 0;
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// Post a Flutter engine task to the event loop for delayed execution.
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virtual void PostFlutterTask(FlutterTask flutter_task,
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uint64_t flutter_target_time_nanos) = 0;
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// Post a task to the event loop.
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virtual void PostTask(TaskClosure task) = 0;
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// Post a task to the event loop or run it immediately if this is being called
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// from the main thread.
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void RunNowOrPostTask(TaskClosure task) {
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if (RunsTasksOnCurrentThread()) {
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task();
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} else {
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PostTask(std::move(task));
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}
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}
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// Creates a new task runner with the given main thread ID, current time
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// provider, and callback for tasks that are ready to be run.
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static std::unique_ptr<TaskRunner> Create(
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DWORD main_thread_id,
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CurrentTimeProc get_current_time,
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const TaskExpiredCallback& on_task_expired);
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};
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} // namespace flutter
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#endif // FLUTTER_SHELL_PLATFORM_WINDOWS_TASK_RUNNER_H_
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