ui/gfx/mac/scoped_ns_disable_screen_updates.h

   1 // Copyright (c) 2011 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_GFX_MAC_SCOPED_NS_DISABLE_SCREEN_UPDATES_H_
   6 #define UI_GFX_MAC_SCOPED_NS_DISABLE_SCREEN_UPDATES_H_
   7
   8 #import <Cocoa/Cocoa.h>
   9
  10 #include "base/basictypes.h"
  11
  12 namespace gfx {
  13
  14 // A stack-based class to disable Cocoa screen updates. When instantiated, it
  15 // disables screen updates and enables them when destroyed. Update disabling
  16 // can be nested, and there is a time-maximum (about 1 second) after which
  17 // Cocoa will automatically re-enable updating. This class doesn't attempt to
  18 // overrule that.
  19 class ScopedNSDisableScreenUpdates {
  20  public:
  21   ScopedNSDisableScreenUpdates() {
  22     NSDisableScreenUpdates();
  23   }
  24   ~ScopedNSDisableScreenUpdates() {
  25     NSEnableScreenUpdates();
  26   }
  27
  28  private:
  29   DISALLOW_COPY_AND_ASSIGN(ScopedNSDisableScreenUpdates);
  30 };
  31
  32 }  // namespace gfx
  33
  34 #endif  // UI_GFX_MAC_SCOPED_NS_DISABLE_SCREEN_UPDATES_H_