| // Copyright 2015 The Chromium Authors |
| // 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/functional/callback.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. |
| // Note that if you want to register a hot key on the SingletonHwnd, you need to |
| // use a SingletonHwndHotKeyObserver instead for each hot key. |
| class GFX_EXPORT SingletonHwndObserver { |
| public: |
| using WndProc = base::RepeatingCallback<void(HWND, UINT, WPARAM, LPARAM)>; |
| |
| explicit SingletonHwndObserver(const WndProc& wnd_proc); |
| |
| SingletonHwndObserver(const SingletonHwndObserver&) = delete; |
| SingletonHwndObserver& operator=(const SingletonHwndObserver&) = delete; |
| |
| ~SingletonHwndObserver(); |
| |
| private: |
| friend class SingletonHwnd; |
| |
| void ClearWndProc(); |
| void OnWndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam); |
| |
| WndProc wnd_proc_; |
| }; |
| |
| } // namespace gfx |
| |
| #endif // UI_GFX_WIN_SINGLETON_HWND_OBSERVER_H_ |