1/* 2 * Copyright (C) 2011 Benjamin Poulain <benjamin@webkit.org> 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#include "config.h" 26#include "QtPanGestureRecognizer.h" 27 28#include "PageViewportControllerClientQt.h" 29#include "QtWebPageEventHandler.h" 30 31namespace WebKit { 32 33QtPanGestureRecognizer::QtPanGestureRecognizer(QtWebPageEventHandler* eventHandler) 34 : QtGestureRecognizer(eventHandler) 35{ 36 reset(); 37} 38 39bool QtPanGestureRecognizer::update(const QTouchEvent::TouchPoint& touchPoint, qint64 eventTimestampMillis) 40{ 41 m_lastPosition = touchPoint.pos(); 42 m_lastEventTimestampMillis = eventTimestampMillis; 43 44 switch (m_state) { 45 case NoGesture: 46 m_state = GestureRecognitionStarted; 47 m_firstScreenPosition = touchPoint.screenPos(); 48 if (viewportController()) 49 viewportController()->cancelScrollAnimation(); 50 return false; 51 case GestureRecognitionStarted: { 52 // To start the gesture, the delta from start in screen coordinates 53 // must be bigger than the trigger threshold. 54 QPointF totalOffsetFromStart(touchPoint.screenPos() - m_firstScreenPosition); 55 if (qAbs(totalOffsetFromStart.x()) < panningInitialTriggerDistanceThreshold && qAbs(totalOffsetFromStart.y()) < panningInitialTriggerDistanceThreshold) 56 return false; 57 58 m_state = GestureRecognized; 59 if (viewportController()) 60 viewportController()->panGestureStarted(touchPoint.pos(), eventTimestampMillis); 61 return true; 62 } 63 case GestureRecognized: 64 if (viewportController()) 65 viewportController()->panGestureRequestUpdate(touchPoint.pos(), eventTimestampMillis); 66 return true; 67 default: 68 ASSERT_NOT_REACHED(); 69 } 70 return false; 71} 72 73void QtPanGestureRecognizer::finish(const QTouchEvent::TouchPoint& touchPoint, qint64 eventTimestampMillis) 74{ 75 if (m_state == NoGesture) 76 return; 77 78 if (viewportController()) 79 viewportController()->panGestureEnded(touchPoint.pos(), eventTimestampMillis); 80 reset(); 81} 82 83void QtPanGestureRecognizer::cancel() 84{ 85 if (m_state == NoGesture) 86 return; 87 88 if (viewportController()) { 89 viewportController()->panGestureEnded(m_lastPosition, m_lastEventTimestampMillis); 90 viewportController()->panGestureCancelled(); 91 } 92 reset(); 93} 94 95} // namespace WebKit 96