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/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_