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