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 BASE_SCOPED_NSDISABLE_SCREEN_UPDATES_H_ 6 #define BASE_SCOPED_NSDISABLE_SCREEN_UPDATES_H_ 7 8 #import <Cocoa/Cocoa.h> 9 10 #include "base/basictypes.h" 11 12 namespace base { 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 20 class ScopedNSDisableScreenUpdates { 21 public: ScopedNSDisableScreenUpdates()22 ScopedNSDisableScreenUpdates() { 23 NSDisableScreenUpdates(); 24 } ~ScopedNSDisableScreenUpdates()25 ~ScopedNSDisableScreenUpdates() { 26 NSEnableScreenUpdates(); 27 } 28 29 private: 30 DISALLOW_COPY_AND_ASSIGN(ScopedNSDisableScreenUpdates); 31 }; 32 33 } // namespace 34 35 #endif // BASE_SCOPED_NSDISABLE_SCREEN_UPDATES_H_ 36