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      1 /*
      2  * Copyright (C) 2010 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef UserGestureIndicator_h
     27 #define UserGestureIndicator_h
     28 
     29 #include <wtf/Noncopyable.h>
     30 
     31 namespace WebCore {
     32 
     33 enum ProcessingUserGestureState {
     34     DefinitelyProcessingUserGesture,
     35     PossiblyProcessingUserGesture,
     36     DefinitelyNotProcessingUserGesture
     37 };
     38 
     39 class UserGestureIndicator {
     40     WTF_MAKE_NONCOPYABLE(UserGestureIndicator);
     41 public:
     42     static bool processingUserGesture() { return s_processingUserGesture == DefinitelyProcessingUserGesture; }
     43     static ProcessingUserGestureState getUserGestureState() { return s_processingUserGesture; }
     44 
     45     explicit UserGestureIndicator(ProcessingUserGestureState);
     46     ~UserGestureIndicator();
     47 
     48 private:
     49     static ProcessingUserGestureState s_processingUserGesture;
     50     ProcessingUserGestureState m_previousValue;
     51 };
     52 
     53 } // namespace WebCore
     54 
     55 #endif // UserGestureIndicator_h
     56