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| 1 // Copyright 2012 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 "cc/scrollbar_animation_controller_linear_fade.h" | |
| 6 | |
| 7 #include "base/time.h" | |
| 8 #include "cc/layer_impl.h" | |
| 9 | |
| 10 namespace cc { | |
| 11 | |
| 12 scoped_ptr<ScrollbarAnimationControllerLinearFade> ScrollbarAnimationControllerL
inearFade::create(LayerImpl* scrollLayer, base::TimeDelta fadeoutDelay, base::Ti
meDelta fadeoutLength) | |
| 13 { | |
| 14 return make_scoped_ptr(new ScrollbarAnimationControllerLinearFade(scrollLaye
r, fadeoutDelay, fadeoutLength)); | |
| 15 } | |
| 16 | |
| 17 ScrollbarAnimationControllerLinearFade::ScrollbarAnimationControllerLinearFade(L
ayerImpl* scrollLayer, base::TimeDelta fadeoutDelay, base::TimeDelta fadeoutLeng
th) | |
| 18 : ScrollbarAnimationController() | |
| 19 , m_scrollLayer(scrollLayer) | |
| 20 , m_scrollGestureInProgress(false) | |
| 21 , m_fadeoutDelay(fadeoutDelay) | |
| 22 , m_fadeoutLength(fadeoutLength) | |
| 23 { | |
| 24 } | |
| 25 | |
| 26 ScrollbarAnimationControllerLinearFade::~ScrollbarAnimationControllerLinearFade(
) | |
| 27 { | |
| 28 } | |
| 29 | |
| 30 bool ScrollbarAnimationControllerLinearFade::isScrollGestureInProgress() const | |
| 31 { | |
| 32 return m_scrollGestureInProgress; | |
| 33 } | |
| 34 | |
| 35 bool ScrollbarAnimationControllerLinearFade::isAnimating() const | |
| 36 { | |
| 37 return !m_lastAwakenTime.is_null(); | |
| 38 } | |
| 39 | |
| 40 base::TimeDelta ScrollbarAnimationControllerLinearFade::delayBeforeStart(base::T
imeTicks now) const | |
| 41 { | |
| 42 if (now > m_lastAwakenTime + m_fadeoutDelay) | |
| 43 return base::TimeDelta(); | |
| 44 return m_fadeoutDelay - (now - m_lastAwakenTime); | |
| 45 } | |
| 46 | |
| 47 bool ScrollbarAnimationControllerLinearFade::animate(base::TimeTicks now) | |
| 48 { | |
| 49 float opacity = opacityAtTime(now); | |
| 50 m_scrollLayer->SetScrollbarOpacity(opacity); | |
| 51 if (!opacity) | |
| 52 m_lastAwakenTime = base::TimeTicks(); | |
| 53 return isAnimating() && delayBeforeStart(now) == base::TimeDelta(); | |
| 54 } | |
| 55 | |
| 56 void ScrollbarAnimationControllerLinearFade::didScrollGestureBegin() | |
| 57 { | |
| 58 m_scrollLayer->SetScrollbarOpacity(1); | |
| 59 m_scrollGestureInProgress = true; | |
| 60 m_lastAwakenTime = base::TimeTicks(); | |
| 61 } | |
| 62 | |
| 63 void ScrollbarAnimationControllerLinearFade::didScrollGestureEnd(base::TimeTicks
now) | |
| 64 { | |
| 65 m_scrollGestureInProgress = false; | |
| 66 m_lastAwakenTime = now; | |
| 67 } | |
| 68 | |
| 69 void ScrollbarAnimationControllerLinearFade::didProgrammaticallyUpdateScroll(bas
e::TimeTicks now) | |
| 70 { | |
| 71 // Don't set m_scrollGestureInProgress as this scroll is not from a gesture | |
| 72 // and we won't receive ScrollEnd. | |
| 73 m_scrollLayer->SetScrollbarOpacity(1); | |
| 74 m_lastAwakenTime = now; | |
| 75 } | |
| 76 | |
| 77 float ScrollbarAnimationControllerLinearFade::opacityAtTime(base::TimeTicks now) | |
| 78 { | |
| 79 if (m_scrollGestureInProgress) | |
| 80 return 1; | |
| 81 | |
| 82 if (m_lastAwakenTime.is_null()) | |
| 83 return 0; | |
| 84 | |
| 85 base::TimeDelta delta = now - m_lastAwakenTime; | |
| 86 | |
| 87 if (delta <= m_fadeoutDelay) | |
| 88 return 1; | |
| 89 if (delta < m_fadeoutDelay + m_fadeoutLength) | |
| 90 return (m_fadeoutDelay + m_fadeoutLength - delta).InSecondsF() / m_fadeo
utLength.InSecondsF(); | |
| 91 return 0; | |
| 92 } | |
| 93 | |
| 94 } // namespace cc | |
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Chromium Code Reviews
Issue 12822004:
Part 3 of cc/ directory shuffles: animation (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src