| // 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 GFX_EXPORT 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_ |