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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "config.h" | |
| 6 #include "platform/scroll/ProgrammaticScrollAnimator.h" | |
| 7 | |
| 8 #include "platform/geometry/IntPoint.h" | |
| 9 #include "platform/scroll/ScrollableArea.h" | |
| 10 #include "public/platform/Platform.h" | |
| 11 #include "public/platform/WebCompositorSupport.h" | |
| 12 #include "public/platform/WebScrollOffsetAnimationCurve.h" | |
| 13 | |
| 14 namespace blink { | |
| 15 | |
| 16 PassOwnPtr<ProgrammaticScrollAnimator> ProgrammaticScrollAnimator::create(Scroll
ableArea* scrollableArea) | |
| 17 { | |
| 18 return adoptPtr(new ProgrammaticScrollAnimator(scrollableArea)); | |
| 19 } | |
| 20 | |
| 21 ProgrammaticScrollAnimator::ProgrammaticScrollAnimator(ScrollableArea* scrollabl
eArea) | |
| 22 : m_scrollableArea(scrollableArea) | |
| 23 , m_startTime(0.0) | |
| 24 { | |
| 25 } | |
| 26 | |
| 27 ProgrammaticScrollAnimator::~ProgrammaticScrollAnimator() | |
| 28 { | |
| 29 } | |
| 30 | |
| 31 void ProgrammaticScrollAnimator::resetAnimationState() | |
| 32 { | |
| 33 m_animationCurve.clear(); | |
| 34 m_startTime = 0.0; | |
| 35 } | |
| 36 | |
| 37 void ProgrammaticScrollAnimator::animateToOffset(FloatPoint offset) | |
| 38 { | |
| 39 m_startTime = 0.0; | |
| 40 m_targetOffset = offset; | |
| 41 m_animationCurve = adoptPtr(Platform::current()->compositorSupport()->create
ScrollOffsetAnimationCurve(m_targetOffset, WebCompositorAnimationCurve::TimingFu
nctionTypeEaseInOut)); | |
| 42 | |
| 43 m_animationCurve->setInitialValue(FloatPoint(m_scrollableArea->scrollPositio
n())); | |
| 44 if (!m_scrollableArea->scheduleAnimation()) { | |
| 45 resetAnimationState(); | |
| 46 m_scrollableArea->notifyScrollPositionChanged(IntPoint(offset.x(), offse
t.y())); | |
| 47 } | |
| 48 } | |
| 49 | |
| 50 void ProgrammaticScrollAnimator::cancelAnimation() | |
| 51 { | |
| 52 resetAnimationState(); | |
| 53 } | |
| 54 | |
| 55 void ProgrammaticScrollAnimator::tickAnimation(double monotonicTime) | |
| 56 { | |
| 57 if (m_animationCurve) { | |
| 58 if (!m_startTime) | |
| 59 m_startTime = monotonicTime; | |
| 60 double elapsedTime = monotonicTime - m_startTime; | |
| 61 bool isFinished = (elapsedTime > m_animationCurve->duration()); | |
| 62 FloatPoint offset = m_animationCurve->getValue(elapsedTime); | |
| 63 m_scrollableArea->notifyScrollPositionChanged(IntPoint(offset.x(), offse
t.y())); | |
| 64 | |
| 65 if (isFinished) { | |
| 66 resetAnimationState(); | |
| 67 } else if (!m_scrollableArea->scheduleAnimation()) { | |
| 68 m_scrollableArea->notifyScrollPositionChanged(IntPoint(m_targetOffse
t.x(), m_targetOffset.y())); | |
| 69 resetAnimationState(); | |
| 70 } | |
| 71 } | |
| 72 } | |
| 73 | |
| 74 } // namespace blink | |
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