1 /* 2 * Copyright (c) 2011, Google 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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef PlatformGestureRecognizer_h 32 #define PlatformGestureRecognizer_h 33 34 #include <wtf/PassOwnPtr.h> 35 36 namespace WebCore { 37 38 class EventHandler; 39 class PlatformGestureRecognizer; 40 class PlatformTouchEvent; 41 42 // A GestureRecognizer detects gestures occurring in the touch event. 43 // In response to a given touch event, the GestureRecognizer, updates 44 // its internal state and optionally dispatches synthetic events to the 45 // invoking EventHandler instance. 46 class PlatformGestureRecognizer { 47 protected: 48 PlatformGestureRecognizer(); 49 50 public: 51 static PassOwnPtr<PlatformGestureRecognizer> create(); 52 virtual ~PlatformGestureRecognizer(); 53 54 // Invoked for each touch event that could contribute to the current gesture. 55 // Takes a PlatformTouchEvent and the EventHandler that originated it and which will also 56 // be the target of any generated synthetic event. Finally, |handled| 57 // specifies if the |event| was actually handled by |source| (by the JavaScript) 58 // Returns true if the event resulted in firing a synthetic event. 59 virtual bool processTouchEventForGesture(const PlatformTouchEvent&, EventHandler*, bool handled) = 0; 60 }; 61 62 } // namespace WebCore 63 64 #endif // PlatformGestureRecognizer_h 65