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      1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef TOOLS_MEMORY_WATCHER_HOTKEY_H_
      6 #define TOOLS_MEMORY_WATCHER_HOTKEY_H_
      7 
      8 #include "ui/gfx/rect.h"
      9 #include "ui/gfx/win/window_impl.h"
     10 
     11 // HotKey handler.
     12 // Programs wishing to register a hotkey can use this.
     13 class HotKeyHandler : public gfx::WindowImpl {
     14  public:
     15   HotKeyHandler(UINT modifiers, UINT vk)
     16     : modifiers_(modifiers),
     17       vkey_(vk) {
     18     Start();
     19   }
     20   ~HotKeyHandler() { Stop(); }
     21 
     22   BEGIN_MSG_MAP_EX(HotKeyHandler)
     23     MESSAGE_HANDLER(WM_HOTKEY, OnHotKey)
     24   END_MSG_MAP()
     25 
     26  private:
     27   static const int hotkey_id = 0x0000baba;
     28 
     29   bool Start() {
     30     set_window_style(WS_POPUP);
     31     Init(NULL, gfx::Rect());
     32     return RegisterHotKey(hwnd(), hotkey_id, modifiers_, vkey_) == TRUE;
     33   }
     34 
     35   void Stop() {
     36     UnregisterHotKey(hwnd(), hotkey_id);
     37     DestroyWindow(hwnd());
     38   }
     39 
     40   // Handle the registered Hotkey being pressed.
     41   virtual LRESULT OnHotKey(UINT /*uMsg*/, WPARAM /*wParam*/,
     42                            LPARAM /*lParam*/, BOOL& bHandled) = 0;
     43 
     44   UINT modifiers_;
     45   UINT vkey_;
     46 };
     47 
     48 #endif  // TOOLS_MEMORY_WATCHER_HOTKEY_H_
     49