| /* |
| * 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 "ScrollingCoordinator.h" |
| #include "ScrollingTreeNode.h" |
| |
| #if PLATFORM(IOS) |
| class ScrollingTreeScrollingNodeDelegate; |
| #endif |
| |
| namespace WebCore { |
| |
| class ScrollingTree; |
| class ScrollingStateScrollingNode; |
| |
| class ScrollingTreeScrollingNode : public ScrollingTreeNode { |
| #if PLATFORM(IOS) |
| friend class ScrollingTreeScrollingNodeDelegate; |
| #endif |
| |
| public: |
| virtual ~ScrollingTreeScrollingNode(); |
| |
| WEBCORE_EXPORT void commitStateBeforeChildren(const ScrollingStateNode&) override; |
| WEBCORE_EXPORT void commitStateAfterChildren(const ScrollingStateNode&) override; |
| |
| WEBCORE_EXPORT void updateLayersAfterAncestorChange(const ScrollingTreeNode& changedNode, const FloatRect& fixedPositionRect, const FloatSize& cumulativeDelta) override; |
| |
| virtual void handleWheelEvent(const PlatformWheelEvent&) = 0; |
| WEBCORE_EXPORT virtual void setScrollPosition(const FloatPoint&); |
| WEBCORE_EXPORT virtual void setScrollPositionWithoutContentEdgeConstraints(const FloatPoint&); |
| |
| virtual void updateLayersAfterViewportChange(const FloatRect& fixedPositionRect, double scale) = 0; |
| virtual void updateLayersAfterDelegatedScroll(const FloatPoint&) { } |
| |
| virtual FloatPoint scrollPosition() const = 0; |
| |
| #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 |
| |
| protected: |
| ScrollingTreeScrollingNode(ScrollingTree&, ScrollingNodeType, ScrollingNodeID); |
| |
| WEBCORE_EXPORT virtual FloatPoint minimumScrollPosition() const; |
| WEBCORE_EXPORT virtual FloatPoint maximumScrollPosition() const; |
| |
| virtual void setScrollLayerPosition(const FloatPoint&, const FloatRect& layoutViewport) = 0; |
| |
| FloatPoint lastCommittedScrollPosition() const { return m_lastCommittedScrollPosition; } |
| const FloatSize& scrollableAreaSize() const { return m_scrollableAreaSize; } |
| const FloatSize& totalContentsSize() const { return m_totalContentsSize; } |
| const FloatSize& reachableContentsSize() const { return m_reachableContentsSize; } |
| 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 canHaveScrollbars() const { return m_scrollableAreaParameters.horizontalScrollbarMode != ScrollbarAlwaysOff || m_scrollableAreaParameters.verticalScrollbarMode != ScrollbarAlwaysOff; } |
| |
| WEBCORE_EXPORT void dumpProperties(WTF::TextStream&, ScrollingStateTreeAsTextBehavior) const override; |
| |
| private: |
| FloatSize m_scrollableAreaSize; |
| FloatSize m_totalContentsSize; |
| FloatSize m_totalContentsSizeForRubberBand; |
| FloatSize m_reachableContentsSize; |
| FloatPoint m_lastCommittedScrollPosition; |
| IntPoint m_scrollOrigin; |
| #if ENABLE(CSS_SCROLL_SNAP) |
| ScrollSnapOffsetsInfo<float> m_snapOffsetsInfo; |
| unsigned m_currentHorizontalSnapPointIndex { 0 }; |
| unsigned m_currentVerticalSnapPointIndex { 0 }; |
| #endif |
| ScrollableAreaParameters m_scrollableAreaParameters; |
| }; |
| |
| } // namespace WebCore |
| |
| SPECIALIZE_TYPE_TRAITS_SCROLLING_NODE(ScrollingTreeScrollingNode, isScrollingNode()) |
| |
| #endif // ENABLE(ASYNC_SCROLLING) |