tools/memory_watcher/hotkey.h

   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/msg_util.h"
  10 #include "ui/gfx/win/window_impl.h"
  11
  12 // HotKey handler.
  13 // Programs wishing to register a hotkey can use this.
  14 class HotKeyHandler : public gfx::WindowImpl {
  15  public:
  16   HotKeyHandler(UINT modifiers, UINT vk)
  17     : modifiers_(modifiers),
  18       vkey_(vk) {
  19     Start();
  20   }
  21   ~HotKeyHandler() { Stop(); }
  22
  23   CR_BEGIN_MSG_MAP_EX(HotKeyHandler)
  24     CR_MSG_WM_HOTKEY(OnHotKey)
  25   CR_END_MSG_MAP()
  26
  27  private:
  28   static const int hotkey_id = 0x0000baba;
  29
  30   bool Start() {
  31     set_window_style(WS_POPUP);
  32     Init(NULL, gfx::Rect());
  33     return RegisterHotKey(hwnd(), hotkey_id, modifiers_, vkey_) == TRUE;
  34   }
  35
  36   void Stop() {
  37     UnregisterHotKey(hwnd(), hotkey_id);
  38     DestroyWindow(hwnd());
  39   }
  40
  41   // Handle the registered Hotkey being pressed.
  42   virtual void OnHotKey(UINT /*uMsg*/,
  43                         WPARAM /*wParam*/,
  44                         LPARAM /*lParam*/) = 0;
  45
  46   UINT modifiers_;
  47   UINT vkey_;
  48 };
  49
  50 #endif  // TOOLS_MEMORY_WATCHER_HOTKEY_H_