ui/views/win/scoped_fullscreen_visibility.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_VIEWS_WIN_SCOPED_FULLSCREEN_VISIBILITY_H_
   6 #define UI_VIEWS_WIN_SCOPED_FULLSCREEN_VISIBILITY_H_
   7
   8 #include <windows.h>
   9
  10 #include <map>
  11
  12 #include "base/basictypes.h"
  13 #include "ui/views/views_export.h"
  14
  15 namespace views {
  16
  17 // Scoping class that ensures a HWND remains hidden while it enters or leaves
  18 // the fullscreen state. This reduces some flicker-jank that an application UI
  19 // might suffer.
  20 class VIEWS_EXPORT ScopedFullscreenVisibility {
  21  public:
  22   explicit ScopedFullscreenVisibility(HWND hwnd);
  23   ~ScopedFullscreenVisibility();
  24
  25   // Returns true if |hwnd| is currently hidden due to instance(s) of this
  26   // class.
  27   static bool IsHiddenForFullscreen(HWND hwnd);
  28
  29  private:
  30   typedef std::map<HWND, int> FullscreenHWNDs;
  31
  32   HWND hwnd_;
  33
  34   static FullscreenHWNDs* full_screen_windows_;
  35
  36   DISALLOW_COPY_AND_ASSIGN(ScopedFullscreenVisibility);
  37 };
  38
  39 }  // namespace views
  40
  41 #endif  // UI_VIEWS_WIN_SCOPED_FULLSCREEN_VISIBILITY_H_