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// Copyright 2013 The Flutter 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 FLUTTER_SHELL_PLATFORM_WINDOWS_TASK_RUNNER_WIN32_WINDOW_H_
#define FLUTTER_SHELL_PLATFORM_WINDOWS_TASK_RUNNER_WIN32_WINDOW_H_
#include <windows.h>
#include <chrono>
#include <memory>
#include <string>
#include <vector>
#include "flutter/fml/macros.h"
namespace flutter {
// Hidden HWND responsible for processing flutter tasks on main thread
class TaskRunnerWindow {
public:
class Delegate {
public:
// Executes expired task, and returns the duration until the next task
// deadline if exists, otherwise returns `std::chrono::nanoseconds::max()`.
//
// Each platform implementation must call this to schedule the tasks.
virtual std::chrono::nanoseconds ProcessTasks() = 0;
};
static std::shared_ptr<TaskRunnerWindow> GetSharedInstance();
// Triggers processing delegate tasks on main thread
void WakeUp();
void AddDelegate(Delegate* delegate);
void RemoveDelegate(Delegate* delegate);
~TaskRunnerWindow();
private:
TaskRunnerWindow();
void ProcessTasks();
void SetTimer(std::chrono::nanoseconds when);
WNDCLASS RegisterWindowClass();
LRESULT
HandleMessage(UINT const message,
WPARAM const wparam,
LPARAM const lparam) noexcept;
static LRESULT CALLBACK WndProc(HWND const window,
UINT const message,
WPARAM const wparam,
LPARAM const lparam) noexcept;
HWND window_handle_;
std::wstring window_class_name_;
std::vector<Delegate*> delegates_;
FML_DISALLOW_COPY_AND_ASSIGN(TaskRunnerWindow);
};
} // namespace flutter
#endif