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Unified Diff: Source/platform/scroll/ProgrammaticScrollAnimator.cpp

Issue 134443003: Implement CSSOM Smooth Scroll API (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: Rebased Created 6 years, 10 months ago
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Index: Source/platform/scroll/ProgrammaticScrollAnimator.cpp
diff --git a/Source/platform/scroll/ProgrammaticScrollAnimator.cpp b/Source/platform/scroll/ProgrammaticScrollAnimator.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..dfc4a43df032f5d6f01e6b0848e190fb3756073c
--- /dev/null
+++ b/Source/platform/scroll/ProgrammaticScrollAnimator.cpp
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2014 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "platform/scroll/ProgrammaticScrollAnimator.h"
+
+#include "platform/geometry/FloatPoint.h"
+#include "platform/geometry/IntPoint.h"
+#include "platform/graphics/GraphicsLayer.h"
+#include "platform/scroll/ScrollableArea.h"
+#include "public/platform/Platform.h"
+#include "public/platform/WebAnimation.h"
+#include "public/platform/WebAnimationCurve.h"
+#include "public/platform/WebCompositorSupport.h"
+#include "public/platform/WebScrollOffsetAnimationCurve.h"
+
+namespace WebCore {
+
+PassOwnPtr<ProgrammaticScrollAnimator> ProgrammaticScrollAnimator::create(ScrollableArea* scrollableArea)
+{
+ return adoptPtr(new ProgrammaticScrollAnimator(scrollableArea));
+}
+
+ProgrammaticScrollAnimator::ProgrammaticScrollAnimator(ScrollableArea* scrollableArea)
+ : m_scrollableArea(scrollableArea)
+ , m_animationId(0)
+ , m_startTime(0.0)
+{
+}
+
+ProgrammaticScrollAnimator::~ProgrammaticScrollAnimator()
+{
+}
+
+void ProgrammaticScrollAnimator::resetAnimationState()
+{
+ m_animationCurve.clear();
+ m_animationId = 0;
+ m_startTime = 0.0;
+ m_scrollableArea->deregisterForAnimation();
+}
+
+void ProgrammaticScrollAnimator::animateToOffset(FloatPoint offset)
+{
+ m_startTime = 0.0;
+ m_targetOffset = offset;
+ OwnPtr<blink::WebScrollOffsetAnimationCurve> curve = adoptPtr(blink::Platform::current()->compositorSupport()->createScrollOffsetAnimationCurve(m_targetOffset, blink::WebAnimationCurve::TimingFunctionTypeEaseInOut));
+ if (m_scrollableArea->canUseCompositedScrollAnimations()) {
+ OwnPtr<blink::WebAnimation> animation = adoptPtr(blink::Platform::current()->compositorSupport()->createAnimation(*curve, blink::WebAnimation::TargetPropertyScrollOffset));
+ m_animationId = animation->id();
+ m_scrollableArea->layerForScrolling()->addAnimation(animation.release());
+ return;
+ }
+
+ m_animationCurve = curve.release();
+ m_animationCurve->setInitialValue(FloatPoint(m_scrollableArea->scrollPosition()));
Ian Vollick 2014/02/06 16:02:31 Will ::tickAnimation continue to be called through
+ if (!m_scrollableArea->registerForAnimation() || !m_scrollableArea->scheduleAnimation()) {
+ resetAnimationState();
+ m_scrollableArea->setScrollOffsetFromProgrammaticAnimation(IntPoint(offset.x(), offset.y()));
+ }
+}
+
+void ProgrammaticScrollAnimator::cancelAnimation()
+{
+ if (m_animationId && m_scrollableArea->layerForScrolling())
+ m_scrollableArea->layerForScrolling()->removeAnimation(m_animationId);
+
+ resetAnimationState();
+}
+
+void ProgrammaticScrollAnimator::tickAnimation(double monotonicTime)
+{
+ if (m_animationCurve) {
+ if (!m_startTime)
+ m_startTime = monotonicTime;
+ double elapsedTime = monotonicTime - m_startTime;
+ bool isFinished = (elapsedTime > m_animationCurve->duration());
+ FloatPoint offset = m_animationCurve->getValue(elapsedTime);
+ m_scrollableArea->setScrollOffsetFromProgrammaticAnimation(IntPoint(offset.x(), offset.y()));
+
+ if (isFinished) {
+ resetAnimationState();
+ } else if (!m_scrollableArea->scheduleAnimation()) {
+ m_scrollableArea->setScrollOffsetFromProgrammaticAnimation(IntPoint(m_targetOffset.x(), m_targetOffset.y()));
+ resetAnimationState();
+ }
+ }
+}
+
+void ProgrammaticScrollAnimator::notifyAnimationStarted(double monotonicTime)
+{
+ m_startTime = monotonicTime;
+}
+
+void ProgrammaticScrollAnimator::notifyAnimationFinished(double monotonicTime)
+{
+ resetAnimationState();
+}
+
+void ProgrammaticScrollAnimator::canUseCompositedScrollAnimationsDidChange()
+{
+ // If we're running an animation on the compositor thread but composited
+ // scrolling is no longer available, we need to take over the animation on
+ // the main thread.
+ if (m_animationId && !m_scrollableArea->canUseCompositedScrollAnimations()) {
+ cancelAnimation();
+ animateToOffset(m_targetOffset);
+ }
+}
+
+} // namespace WebCore

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