event_watcher.h

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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_EVENT_WATCHER_H_
#define FLUTTER_SHELL_PLATFORM_WINDOWS_EVENT_WATCHER_H_
 
#include <Windows.h>
 
#include <functional>
 
#include "flutter/fml/macros.h"
 
namespace flutter {
 
// A win32 `HANDLE` wrapper for use as a one-time callback.
class EventWatcher {
 public:
  explicit EventWatcher(std::function<void()> callback);
  ~EventWatcher();
 
  // Returns `HANDLE`, which can be used to register an event listener.
  HANDLE GetHandle();
 
 private:
  static VOID CALLBACK CallbackForWait(PVOID context, BOOLEAN);
 
  std::function<void()> callback_;
 
  HANDLE handle_;
  HANDLE handle_for_wait_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(EventWatcher);
};
 
}  // namespace flutter
 
#endif  // FLUTTER_SHELL_PLATFORM_WINDOWS_EVENT_WATCHER_H_