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247 lines
11 KiB
C++
247 lines
11 KiB
C++
/*
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* Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
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*
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* Portions are Copyright (C) 1998 Netscape Communications Corporation.
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*
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* Other contributors:
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* Robert O'Callahan <roc+@cs.cmu.edu>
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* David Baron <dbaron@fas.harvard.edu>
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* Christian Biesinger <cbiesinger@web.de>
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* Randall Jesup <rjesup@wgate.com>
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* Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
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* Josh Soref <timeless@mac.com>
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* Boris Zbarsky <bzbarsky@mit.edu>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Alternatively, the contents of this file may be used under the terms
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* of either the Mozilla Public License Version 1.1, found at
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* http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
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* License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
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* (the "GPL"), in which case the provisions of the MPL or the GPL are
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* applicable instead of those above. If you wish to allow use of your
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* version of this file only under the terms of one of those two
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* licenses (the MPL or the GPL) and not to allow others to use your
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* version of this file under the LGPL, indicate your decision by
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* deletingthe provisions above and replace them with the notice and
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* other provisions required by the MPL or the GPL, as the case may be.
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* If you do not delete the provisions above, a recipient may use your
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* version of this file under any of the LGPL, the MPL or the GPL.
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*/
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#ifndef RenderLayerScrollableArea_h
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#define RenderLayerScrollableArea_h
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#include "platform/scroll/ScrollableArea.h"
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namespace blink {
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enum ResizerHitTestType {
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ResizerForPointer,
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ResizerForTouch
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};
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class PlatformEvent;
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class RenderBox;
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class RenderLayer;
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class RenderLayerScrollableArea FINAL : public ScrollableArea {
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public:
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// FIXME: We should pass in the RenderBox but this opens a window
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// for crashers during RenderLayer setup (see crbug.com/368062).
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RenderLayerScrollableArea(RenderLayer&);
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virtual ~RenderLayerScrollableArea();
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bool hasHorizontalScrollbar() const { return horizontalScrollbar(); }
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bool hasVerticalScrollbar() const { return verticalScrollbar(); }
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virtual Scrollbar* horizontalScrollbar() const OVERRIDE { return m_hBar.get(); }
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virtual Scrollbar* verticalScrollbar() const OVERRIDE { return m_vBar.get(); }
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virtual HostWindow* hostWindow() const OVERRIDE;
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virtual GraphicsLayer* layerForScrolling() const OVERRIDE;
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virtual GraphicsLayer* layerForHorizontalScrollbar() const OVERRIDE;
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virtual GraphicsLayer* layerForVerticalScrollbar() const OVERRIDE;
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virtual GraphicsLayer* layerForScrollCorner() const OVERRIDE;
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virtual bool usesCompositedScrolling() const OVERRIDE;
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virtual void invalidateScrollbarRect(Scrollbar*, const IntRect&) OVERRIDE;
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virtual void invalidateScrollCornerRect(const IntRect&) OVERRIDE;
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virtual bool isActive() const OVERRIDE;
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virtual bool isScrollCornerVisible() const OVERRIDE;
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virtual IntRect scrollCornerRect() const OVERRIDE;
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virtual IntRect convertFromScrollbarToContainingView(const Scrollbar*, const IntRect&) const OVERRIDE;
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virtual IntRect convertFromContainingViewToScrollbar(const Scrollbar*, const IntRect&) const OVERRIDE;
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virtual IntPoint convertFromScrollbarToContainingView(const Scrollbar*, const IntPoint&) const OVERRIDE;
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virtual IntPoint convertFromContainingViewToScrollbar(const Scrollbar*, const IntPoint&) const OVERRIDE;
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virtual int scrollSize(ScrollbarOrientation) const OVERRIDE;
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virtual void setScrollOffset(const IntPoint&) OVERRIDE;
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virtual IntPoint scrollPosition() const OVERRIDE;
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virtual IntPoint minimumScrollPosition() const OVERRIDE;
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virtual IntPoint maximumScrollPosition() const OVERRIDE;
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virtual IntRect visibleContentRect(IncludeScrollbarsInRect) const OVERRIDE;
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virtual int visibleHeight() const OVERRIDE;
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virtual int visibleWidth() const OVERRIDE;
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virtual IntSize contentsSize() const OVERRIDE;
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virtual IntSize overhangAmount() const OVERRIDE;
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virtual IntPoint lastKnownMousePosition() const OVERRIDE;
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virtual bool scrollbarsCanBeActive() const OVERRIDE;
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virtual IntRect scrollableAreaBoundingBox() const OVERRIDE;
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virtual bool userInputScrollable(ScrollbarOrientation) const OVERRIDE;
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virtual bool shouldPlaceVerticalScrollbarOnLeft() const OVERRIDE;
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virtual int pageStep(ScrollbarOrientation) const OVERRIDE;
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int scrollXOffset() const { return m_scrollOffset.width() + scrollOrigin().x(); }
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int scrollYOffset() const { return m_scrollOffset.height() + scrollOrigin().y(); }
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IntSize scrollOffset() const { return m_scrollOffset; }
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// FIXME: We shouldn't allow access to m_overflowRect outside this class.
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LayoutRect overflowRect() const { return m_overflowRect; }
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void scrollToOffset(const IntSize& scrollOffset, ScrollOffsetClamping = ScrollOffsetUnclamped);
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void scrollToXOffset(int x, ScrollOffsetClamping clamp = ScrollOffsetUnclamped) { scrollToOffset(IntSize(x, scrollYOffset()), clamp); }
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void scrollToYOffset(int y, ScrollOffsetClamping clamp = ScrollOffsetUnclamped) { scrollToOffset(IntSize(scrollXOffset(), y), clamp); }
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void updateAfterLayout();
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void updateAfterStyleChange(const RenderStyle*);
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void updateAfterOverflowRecalc();
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virtual bool updateAfterCompositingChange() OVERRIDE;
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bool hasScrollbar() const { return m_hBar || m_vBar; }
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void resize(const PlatformEvent&, const LayoutSize&);
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IntSize offsetFromResizeCorner(const IntPoint& absolutePoint) const;
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bool inResizeMode() const { return m_inResizeMode; }
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void setInResizeMode(bool inResizeMode) { m_inResizeMode = inResizeMode; }
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IntRect touchResizerCornerRect(const IntRect& bounds) const
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{
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return resizerCornerRect(bounds, ResizerForTouch);
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}
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LayoutUnit scrollWidth() const;
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LayoutUnit scrollHeight() const;
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int pixelSnappedScrollWidth() const;
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int pixelSnappedScrollHeight() const;
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int verticalScrollbarWidth(OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize) const;
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int horizontalScrollbarHeight(OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize) const;
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IntSize adjustedScrollOffset() const { return IntSize(scrollXOffset(), scrollYOffset()); }
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void paintResizer(GraphicsContext*, const IntPoint& paintOffset, const IntRect& damageRect);
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void paintOverflowControls(GraphicsContext*, const IntPoint& paintOffset, const IntRect& damageRect, bool paintingOverlayControls);
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void paintScrollCorner(GraphicsContext*, const IntPoint&, const IntRect& damageRect);
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void positionOverflowControls(const IntSize& offsetFromRoot);
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// isPointInResizeControl() is used for testing if a pointer/touch position is in the resize control
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// area.
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bool isPointInResizeControl(const IntPoint& absolutePoint, ResizerHitTestType) const;
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bool hitTestOverflowControls(HitTestResult&, const IntPoint& localPoint);
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bool hitTestResizerInFragments(const LayerFragments&, const HitTestLocation&) const;
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LayoutRect exposeRect(const LayoutRect&, const ScrollAlignment& alignX, const ScrollAlignment& alignY);
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// Returns true our scrollable area is in the FrameView's collection of scrollable areas. This can
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// only happen if we're both scrollable, and we do in fact overflow. This means that overflow: hidden
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// layers never get added to the FrameView's collection.
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bool scrollsOverflow() const { return m_scrollsOverflow; }
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// Rectangle encompassing the scroll corner and resizer rect.
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IntRect scrollCornerAndResizerRect() const;
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void updateNeedsCompositedScrolling();
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bool needsCompositedScrolling() const { return m_needsCompositedScrolling; }
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// These are used during compositing updates to determine if the overflow
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// controls need to be repositioned in the GraphicsLayer tree.
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void setTopmostScrollChild(RenderLayer*);
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RenderLayer* topmostScrollChild() const { ASSERT(!m_nextTopmostScrollChild); return m_topmostScrollChild; }
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private:
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bool hasHorizontalOverflow() const;
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bool hasVerticalOverflow() const;
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bool hasScrollableHorizontalOverflow() const;
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bool hasScrollableVerticalOverflow() const;
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void computeScrollDimensions();
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IntSize clampScrollOffset(const IntSize&) const;
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void setScrollOffset(const IntSize& scrollOffset) { m_scrollOffset = scrollOffset; }
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IntRect rectForHorizontalScrollbar(const IntRect& borderBoxRect) const;
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IntRect rectForVerticalScrollbar(const IntRect& borderBoxRect) const;
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LayoutUnit verticalScrollbarStart(int minX, int maxX) const;
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LayoutUnit horizontalScrollbarStart(int minX) const;
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IntSize scrollbarOffset(const Scrollbar*) const;
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PassRefPtr<Scrollbar> createScrollbar(ScrollbarOrientation);
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void destroyScrollbar(ScrollbarOrientation);
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void setHasHorizontalScrollbar(bool hasScrollbar);
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void setHasVerticalScrollbar(bool hasScrollbar);
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// See comments on isPointInResizeControl.
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IntRect resizerCornerRect(const IntRect&, ResizerHitTestType) const;
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bool overflowControlsIntersectRect(const IntRect& localRect) const;
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void updateResizerAreaSet();
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void drawPlatformResizerImage(GraphicsContext*, IntRect resizerCornerRect);
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RenderBox& box() const;
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RenderLayer* layer() const;
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void updateScrollableAreaSet(bool hasOverflow);
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void updateCompositingLayersAfterScroll();
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RenderLayer& m_layer;
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// Keeps track of whether the layer is currently resizing, so events can cause resizing to start and stop.
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unsigned m_inResizeMode : 1;
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unsigned m_scrollsOverflow : 1;
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unsigned m_scrollDimensionsDirty : 1;
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unsigned m_inOverflowRelayout : 1;
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RenderLayer* m_nextTopmostScrollChild;
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RenderLayer* m_topmostScrollChild;
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// FIXME: once cc can handle composited scrolling with clip paths, we will
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// no longer need this bit.
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unsigned m_needsCompositedScrolling : 1;
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// The width/height of our scrolled area.
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LayoutRect m_overflowRect;
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// This is the (scroll) offset from scrollOrigin().
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IntSize m_scrollOffset;
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IntPoint m_cachedOverlayScrollbarOffset;
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// For areas with overflow, we have a pair of scrollbars.
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RefPtr<Scrollbar> m_hBar;
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RefPtr<Scrollbar> m_vBar;
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};
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} // namespace blink
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#endif // RenderLayerScrollableArea_h
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