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/*
* Copyright (C) 2012 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
*/
#pragma once
#if ENABLE(ASYNC_SCROLLING)
#include "IntRect.h"
#include "ScrollSnapOffsetsInfo.h"
#include "ScrollTypes.h"
#include "ScrollableArea.h"
#include "ScrollingCoordinator.h"
#include "ScrollingTreeNode.h"
namespace WebCore {
class ScrollingTree;
class ScrollingStateScrollingNode;
class WEBCORE_EXPORT ScrollingTreeScrollingNode : public ScrollingTreeNode {
friend class ScrollingTreeScrollingNodeDelegate;
#if PLATFORM(MAC)
friend class ScrollingTreeScrollingNodeDelegateMac;
#endif
friend class ScrollingTree;
public:
virtual ~ScrollingTreeScrollingNode();
void commitStateBeforeChildren(const ScrollingStateNode&) override;
void commitStateAfterChildren(const ScrollingStateNode&) override;
virtual ScrollingEventResult handleWheelEvent(const PlatformWheelEvent&);
FloatPoint currentScrollPosition() const { return m_currentScrollPosition; }
FloatPoint currentScrollOffset() const { return ScrollableArea::scrollOffsetFromPosition(m_currentScrollPosition, toFloatSize(m_scrollOrigin)); }
FloatPoint lastCommittedScrollPosition() const { return m_lastCommittedScrollPosition; }
FloatSize scrollDeltaSinceLastCommit() const { return m_currentScrollPosition - m_lastCommittedScrollPosition; }
// These are imperative; they adjust the scrolling layers.
void scrollTo(const FloatPoint&, ScrollType = ScrollType::User, ScrollPositionClamp = ScrollPositionClamp::ToContentEdges);
void scrollBy(const FloatSize&, ScrollPositionClamp = ScrollPositionClamp::ToContentEdges);
void wasScrolledByDelegatedScrolling(const FloatPoint& position, Optional<FloatRect> overrideLayoutViewport = { }, ScrollingLayerPositionAction = ScrollingLayerPositionAction::Sync);
const FloatSize& scrollableAreaSize() const { return m_scrollableAreaSize; }
const FloatSize& totalContentsSize() const { return m_totalContentsSize; }
bool horizontalScrollbarHiddenByStyle() const { return m_scrollableAreaParameters.horizontalScrollbarHiddenByStyle; }
bool verticalScrollbarHiddenByStyle() const { return m_scrollableAreaParameters.verticalScrollbarHiddenByStyle; }
bool canHaveScrollbars() const { return m_scrollableAreaParameters.horizontalScrollbarMode != ScrollbarAlwaysOff || m_scrollableAreaParameters.verticalScrollbarMode != ScrollbarAlwaysOff; }
#if ENABLE(CSS_SCROLL_SNAP)
const Vector<float>& horizontalSnapOffsets() const { return m_snapOffsetsInfo.horizontalSnapOffsets; }
const Vector<float>& verticalSnapOffsets() const { return m_snapOffsetsInfo.verticalSnapOffsets; }
const Vector<ScrollOffsetRange<float>>& horizontalSnapOffsetRanges() const { return m_snapOffsetsInfo.horizontalSnapOffsetRanges; }
const Vector<ScrollOffsetRange<float>>& verticalSnapOffsetRanges() const { return m_snapOffsetsInfo.verticalSnapOffsetRanges; }
unsigned currentHorizontalSnapPointIndex() const { return m_currentHorizontalSnapPointIndex; }
unsigned currentVerticalSnapPointIndex() const { return m_currentVerticalSnapPointIndex; }
void setCurrentHorizontalSnapPointIndex(unsigned index) { m_currentHorizontalSnapPointIndex = index; }
void setCurrentVerticalSnapPointIndex(unsigned index) { m_currentVerticalSnapPointIndex = index; }
#endif
bool useDarkAppearanceForScrollbars() const { return m_scrollableAreaParameters.useDarkAppearanceForScrollbars; }
bool scrollLimitReached(const PlatformWheelEvent&) const;
ScrollingTreeScrollingNode* scrollingNodeForPoint(LayoutPoint) const override;
const LayerRepresentation& scrollContainerLayer() const { return m_scrollContainerLayer; }
const LayerRepresentation& scrolledContentsLayer() const { return m_scrolledContentsLayer; }
protected:
ScrollingTreeScrollingNode(ScrollingTree&, ScrollingNodeType, ScrollingNodeID);
virtual FloatPoint minimumScrollPosition() const;
virtual FloatPoint maximumScrollPosition() const;
FloatPoint clampScrollPosition(const FloatPoint&) const;
virtual FloatPoint adjustedScrollPosition(const FloatPoint&, ScrollPositionClamp = ScrollPositionClamp::ToContentEdges) const;
virtual void currentScrollPositionChanged();
virtual void updateViewportForCurrentScrollPosition(Optional<FloatRect> = { }) { }
virtual bool scrollPositionAndLayoutViewportMatch(const FloatPoint& position, Optional<FloatRect> overrideLayoutViewport);
virtual void repositionScrollingLayers() { }
virtual void repositionRelatedLayers() { }
void applyLayerPositions() override;
const FloatSize& reachableContentsSize() const { return m_reachableContentsSize; }
const LayoutRect& parentRelativeScrollableRect() const { return m_parentRelativeScrollableRect; }
const IntPoint& scrollOrigin() const { return m_scrollOrigin; }
// If the totalContentsSize changes in the middle of a rubber-band, we still want to use the old totalContentsSize for the sake of
// computing the stretchAmount(). Using the old value will keep the animation smooth. When there is no rubber-band in progress at
// all, m_totalContentsSizeForRubberBand should be equivalent to m_totalContentsSize.
const FloatSize& totalContentsSizeForRubberBand() const { return m_totalContentsSizeForRubberBand; }
void setTotalContentsSizeForRubberBand(const FloatSize& totalContentsSizeForRubberBand) { m_totalContentsSizeForRubberBand = totalContentsSizeForRubberBand; }
ScrollElasticity horizontalScrollElasticity() const { return m_scrollableAreaParameters.horizontalScrollElasticity; }
ScrollElasticity verticalScrollElasticity() const { return m_scrollableAreaParameters.verticalScrollElasticity; }
bool hasEnabledHorizontalScrollbar() const { return m_scrollableAreaParameters.hasEnabledHorizontalScrollbar; }
bool hasEnabledVerticalScrollbar() const { return m_scrollableAreaParameters.hasEnabledVerticalScrollbar; }
bool isMonitoringWheelEvents() const { return m_isMonitoringWheelEvents; }
LayoutPoint parentToLocalPoint(LayoutPoint) const override;
LayoutPoint localToContentsPoint(LayoutPoint) const override;
void dumpProperties(WTF::TextStream&, ScrollingStateTreeAsTextBehavior) const override;
private:
FloatSize m_scrollableAreaSize;
FloatSize m_totalContentsSize;
FloatSize m_totalContentsSizeForRubberBand;
FloatSize m_reachableContentsSize;
FloatPoint m_lastCommittedScrollPosition;
LayoutRect m_parentRelativeScrollableRect;
FloatPoint m_currentScrollPosition;
IntPoint m_scrollOrigin;
#if ENABLE(CSS_SCROLL_SNAP)
ScrollSnapOffsetsInfo<float> m_snapOffsetsInfo;
unsigned m_currentHorizontalSnapPointIndex { 0 };
unsigned m_currentVerticalSnapPointIndex { 0 };
#endif
ScrollableAreaParameters m_scrollableAreaParameters;
bool m_isMonitoringWheelEvents { false };
bool m_isFirstCommit { true };
LayerRepresentation m_scrollContainerLayer;
LayerRepresentation m_scrolledContentsLayer;
};
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_SCROLLING_NODE(ScrollingTreeScrollingNode, isScrollingNode())
#endif // ENABLE(ASYNC_SCROLLING)