ui/base/win/foreground_helper.h

   1 // Copyright (c) 2012 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 UI_BASE_WIN_FOREGROUND_HELPER_H_
   6 #define UI_BASE_WIN_FOREGROUND_HELPER_H_
   7
   8 #include "base/logging.h"
   9 #include "ui/base/ui_base_export.h"
  10 #include "ui/gfx/win/window_impl.h"
  11
  12 namespace ui {
  13
  14 // Helper class for moving a window to the foreground.
  15 // Windows XP and later will not allow a window which is in the background to
  16 // move to the foreground, unless requested by the current window in the
  17 // foreground.  For automated testing, we really want some of our windows
  18 // to be capable of moving to the foreground.
  19 //
  20 // This is probably leveraging a windows bug.
  21 class UI_BASE_EXPORT ForegroundHelper : public gfx::WindowImpl {
  22  public:
  23   ForegroundHelper() : window_(NULL) { }
  24
  25   CR_BEGIN_MSG_MAP_EX(ForegroundHelper)
  26     CR_MSG_WM_HOTKEY(OnHotKey)
  27   CR_END_MSG_MAP()
  28
  29   // Brings a window into the foreground.
  30   // Can be called from any window, even if the caller is not the
  31   // foreground window.
  32   static HRESULT SetForeground(HWND window);
  33
  34  private:
  35   HRESULT ForegroundHotKey(HWND window);
  36
  37   // Handle the registered Hotkey being pressed.
  38   void OnHotKey(int id, UINT vcode, UINT modifiers);
  39
  40   HWND window_;
  41
  42   DISALLOW_COPY_AND_ASSIGN(ForegroundHelper);
  43 };
  44
  45 }  // namespace ui
  46
  47 #endif  // UI_BASE_WIN_FOREGROUND_HELPER_H_