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// Copyright (c) 2012 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_H_
#define UI_GFX_WIN_SINGLETON_HWND_H_
#include <windows.h>
#include <vector>
#include "base/basictypes.h"
#include "base/callback_forward.h"
#include "base/observer_list.h"
#include "ui/gfx/win/window_impl.h"
template<typename T> struct DefaultSingletonTraits;
namespace gfx {
// Singleton message-only HWND that allows interested clients to receive WM_*
// notifications.
class SingletonHwnd : public WindowImpl {
public:
static SingletonHwnd* GetInstance();
// Observer interface for receiving Windows WM_* notifications.
class Observer {
public:
virtual void OnWndProc(HWND hwnd,
UINT message,
WPARAM wparam,
LPARAM lparam) = 0;
};
// Add/remove observer to receive WM_* notifications.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Windows callback for WM_* notifications.
virtual BOOL ProcessWindowMessage(HWND window,
UINT message,
WPARAM wparam,
LPARAM lparam,
LRESULT& result,
DWORD msg_map_id) OVERRIDE;
private:
friend struct DefaultSingletonTraits<SingletonHwnd>;
SingletonHwnd();
~SingletonHwnd();
// List of registered observers.
ObserverList<Observer> observer_list_;
DISALLOW_COPY_AND_ASSIGN(SingletonHwnd);
};
} // namespace gfx
#endif // UI_GFX_WIN_SINGLETON_HWND_H_
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