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 ScrollAnimatorNone_h 32 #define ScrollAnimatorNone_h 33 34 #include "platform/Timer.h" 35 #include "platform/geometry/FloatPoint.h" 36 #include "platform/scroll/ScrollAnimator.h" 37 38 class ScrollAnimatorNoneTest; 39 40 namespace WebCore { 41 42 class IntPoint; 43 class ActivePlatformGestureAnimation; 44 struct ScrollAnimatorParameters; 45 46 class PLATFORM_EXPORT ScrollAnimatorNone : public ScrollAnimator { 47 public: 48 explicit ScrollAnimatorNone(ScrollableArea*); 49 virtual ~ScrollAnimatorNone(); 50 51 virtual bool scroll(ScrollbarOrientation, ScrollGranularity, float step, float delta) OVERRIDE; 52 virtual void scrollToOffsetWithoutAnimation(const FloatPoint&) OVERRIDE; 53 54 virtual void cancelAnimations() OVERRIDE; 55 virtual void serviceScrollAnimations() OVERRIDE; 56 57 virtual void willEndLiveResize() OVERRIDE; 58 virtual void didAddVerticalScrollbar(Scrollbar*) OVERRIDE; 59 virtual void didAddHorizontalScrollbar(Scrollbar*) OVERRIDE; 60 61 enum Curve { 62 Linear, 63 Quadratic, 64 Cubic, 65 Quartic, 66 Bounce 67 }; 68 69 struct PLATFORM_EXPORT Parameters { 70 Parameters(); 71 Parameters(bool isEnabled, double animationTime, double repeatMinimumSustainTime, Curve attackCurve, double attackTime, Curve releaseCurve, double releaseTime, Curve coastTimeCurve, double maximumCoastTime); 72 73 // Note that the times can be overspecified such that releaseTime or releaseTime and attackTime are greater 74 // than animationTime. animationTime takes priority over releaseTime, capping it. attackTime is capped at 75 // whatever time remains, or zero if none. 76 bool m_isEnabled; 77 double m_animationTime; 78 double m_repeatMinimumSustainTime; 79 80 Curve m_attackCurve; 81 double m_attackTime; 82 83 Curve m_releaseCurve; 84 double m_releaseTime; 85 86 Curve m_coastTimeCurve; 87 double m_maximumCoastTime; 88 }; 89 90 protected: animationWillStart()91 virtual void animationWillStart() { } animationDidFinish()92 virtual void animationDidFinish() { } 93 94 Parameters parametersForScrollGranularity(ScrollGranularity) const; 95 96 friend class ::ScrollAnimatorNoneTest; 97 98 struct PLATFORM_EXPORT PerAxisData { 99 PerAxisData(ScrollAnimatorNone* parent, float* currentPos, int visibleLength); 100 void reset(); 101 bool updateDataFromParameters(float step, float delta, float scrollableSize, double currentTime, Parameters*); 102 bool animateScroll(double currentTime); 103 void updateVisibleLength(int visibleLength); 104 105 static double curveAt(Curve, double t); 106 static double attackCurve(Curve, double deltaT, double curveT, double startPos, double attackPos); 107 static double releaseCurve(Curve, double deltaT, double curveT, double releasePos, double desiredPos); 108 static double coastCurve(Curve, double factor); 109 110 static double curveIntegralAt(Curve, double t); 111 static double attackArea(Curve, double startT, double endT); 112 static double releaseArea(Curve, double startT, double endT); 113 114 double newScrollAnimationPosition(double deltaTime); 115 116 float* m_currentPosition; 117 double m_currentVelocity; 118 119 double m_desiredPosition; 120 double m_desiredVelocity; 121 122 double m_startPosition; 123 double m_startTime; 124 double m_startVelocity; 125 126 double m_animationTime; 127 double m_lastAnimationTime; 128 129 double m_attackPosition; 130 double m_attackTime; 131 Curve m_attackCurve; 132 133 double m_releasePosition; 134 double m_releaseTime; 135 Curve m_releaseCurve; 136 137 int m_visibleLength; 138 }; 139 140 void startNextTimer(); 141 void animationTimerFired(); 142 143 void stopAnimationTimerIfNeeded(); 144 bool animationTimerActive(); 145 void updateVisibleLengths(); 146 147 PerAxisData m_horizontalData; 148 PerAxisData m_verticalData; 149 150 double m_startTime; 151 bool m_animationActive; 152 }; 153 154 } // namespace WebCore 155 156 #endif // ScrollAnimatorNone_h 157