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// Copyright 2015 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 UI_GFX_WIN_SINGLETON_HWND_OBSERVER_H_
#define UI_GFX_WIN_SINGLETON_HWND_OBSERVER_H_
#include <windows.h>
#include "base/callback.h"
#include "base/macros.h"
#include "ui/gfx/gfx_export.h"
namespace gfx {
class SingletonHwnd;
// Singleton lifetime management is tricky. This observer handles the correct
// cleanup if either the SingletonHwnd or forwarded object is destroyed first.
class GFX_EXPORT SingletonHwndObserver {
public:
typedef base::Callback<void(HWND, UINT, WPARAM, LPARAM)> WndProc;
explicit SingletonHwndObserver(const WndProc& wnd_proc);
~SingletonHwndObserver();
private:
friend class SingletonHwnd;
void ClearWndProc();
void OnWndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam);
WndProc wnd_proc_;
DISALLOW_COPY_AND_ASSIGN(SingletonHwndObserver);
};
} // namespace gfx
#endif // UI_GFX_WIN_SINGLETON_HWND_OBSERVER_H_
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