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+/*
+ * Copyright (C) 2003 Apple Computer, Inc.
+ *
+ * Portions are Copyright (C) 1998 Netscape Communications Corporation.
+ *
+ * Other contributors:
+ * Robert O'Callahan <roc+@cs.cmu.edu>
+ * David Baron <dbaron@fas.harvard.edu>
+ * Christian Biesinger <cbiesinger@web.de>
+ * Randall Jesup <rjesup@wgate.com>
+ * Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
+ * Josh Soref <timeless@mac.com>
+ * Boris Zbarsky <bzbarsky@mit.edu>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Alternatively, the contents of this file may be used under the terms
+ * of either the Mozilla Public License Version 1.1, found at
+ * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
+ * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
+ * (the "GPL"), in which case the provisions of the MPL or the GPL are
+ * applicable instead of those above. If you wish to allow use of your
+ * version of this file only under the terms of one of those two
+ * licenses (the MPL or the GPL) and not to allow others to use your
+ * version of this file under the LGPL, indicate your decision by
+ * deletingthe provisions above and replace them with the notice and
+ * other provisions required by the MPL or the GPL, as the case may be.
+ * If you do not delete the provisions above, a recipient may use your
+ * version of this file under any of the LGPL, the MPL or the GPL.
+ */
+
+#ifndef RenderLayer_h
+#define RenderLayer_h
+
+#include "RenderObject.h"
+#include "ScrollBar.h"
+#include "Timer.h"
+#include <wtf/OwnPtr.h>
+
+namespace WebCore {
+
+class AffineTransform;
+class CachedResource;
+class HitTestResult;
+class PlatformScrollbar;
+class RenderFrameSet;
+class RenderObject;
+class RenderStyle;
+class RenderTable;
+class RenderText;
+class RenderView;
+class Scrollbar;
+
+struct HitTestRequest;
+
+class ClipRects {
+public:
+ ClipRects(const IntRect& r)
+ : m_overflowClipRect(r)
+ , m_fixedClipRect(r)
+ , m_posClipRect(r)
+ , m_refCnt(0)
+ , m_fixed(false)
+ {
+ }
+
+ ClipRects(const IntRect& overflowRect, const IntRect& fixedRect, const IntRect& posRect, bool fixed)
+ : m_overflowClipRect(overflowRect)
+ , m_fixedClipRect(fixedRect)
+ , m_posClipRect(posRect)
+ , m_refCnt(0)
+ , m_fixed(fixed)
+ {
+ }
+
+ const IntRect& overflowClipRect() { return m_overflowClipRect; }
+ const IntRect& fixedClipRect() { return m_fixedClipRect; }
+ const IntRect& posClipRect() { return m_posClipRect; }
+ bool fixed() const { return m_fixed; }
+
+ void ref() { m_refCnt++; }
+ void deref(RenderArena* renderArena) { if (--m_refCnt == 0) destroy(renderArena); }
+
+ void destroy(RenderArena*);
+
+ // Overloaded new operator.
+ void* operator new(size_t, RenderArena*) throw();
+
+ // Overridden to prevent the normal delete from being called.
+ void operator delete(void*, size_t);
+
+private:
+ // The normal operator new is disallowed on all render objects.
+ void* operator new(size_t) throw();
+
+private:
+ IntRect m_overflowClipRect;
+ IntRect m_fixedClipRect;
+ IntRect m_posClipRect;
+ unsigned m_refCnt : 31;
+ bool m_fixed : 1;
+};
+
+
+// FIXME: move this to its own file
+// This class handles the auto-scrolling of layers with overflow: marquee.
+class Marquee {
+public:
+ Marquee(RenderLayer*);
+
+ int speed() const { return m_speed; }
+ int marqueeSpeed() const;
+
+ EMarqueeDirection reverseDirection() const { return static_cast<EMarqueeDirection>(-direction()); }
+ EMarqueeDirection direction() const;
+
+ bool isHorizontal() const;
+
+ int computePosition(EMarqueeDirection, bool stopAtClientEdge);
+
+ void setEnd(int end) { m_end = end; }
+
+ void start();
+ void suspend();
+ void stop();
+
+ void updateMarqueeStyle();
+ void updateMarqueePosition();
+
+private:
+ void timerFired(Timer<Marquee>*);
+
+ RenderLayer* m_layer;
+ int m_currentLoop;
+ int m_totalLoops;
+ Timer<Marquee> m_timer;
+ int m_start;
+ int m_end;
+ int m_speed;
+ Length m_height;
+ bool m_reset: 1;
+ bool m_suspended : 1;
+ bool m_stopped : 1;
+ EMarqueeDirection m_direction : 4;
+};
+
+class RenderLayer : public ScrollbarClient {
+public:
+ enum ScrollBehavior {
+ noScroll,
+ alignCenter,
+ alignTop,
+ alignBottom,
+ alignLeft,
+ alignRight,
+ alignToClosestEdge
+ };
+
+ struct ScrollAlignment {
+ ScrollBehavior m_rectVisible;
+ ScrollBehavior m_rectHidden;
+ ScrollBehavior m_rectPartial;
+ };
+
+ static const ScrollAlignment gAlignCenterIfNeeded;
+ static const ScrollAlignment gAlignToEdgeIfNeeded;
+ static const ScrollAlignment gAlignCenterAlways;
+ static const ScrollAlignment gAlignTopAlways;
+ static const ScrollAlignment gAlignBottomAlways;
+
+ static ScrollBehavior getVisibleBehavior(const ScrollAlignment& s) { return s.m_rectVisible; }
+ static ScrollBehavior getPartialBehavior(const ScrollAlignment& s) { return s.m_rectPartial; }
+ static ScrollBehavior getHiddenBehavior(const ScrollAlignment& s) { return s.m_rectHidden; }
+
+ RenderLayer(RenderObject*);
+ ~RenderLayer();
+
+ RenderObject* renderer() const { return m_object; }
+ RenderLayer* parent() const { return m_parent; }
+ RenderLayer* previousSibling() const { return m_previous; }
+ RenderLayer* nextSibling() const { return m_next; }
+ RenderLayer* firstChild() const { return m_first; }
+ RenderLayer* lastChild() const { return m_last; }
+
+ void addChild(RenderLayer* newChild, RenderLayer* beforeChild = 0);
+ RenderLayer* removeChild(RenderLayer*);
+
+ void removeOnlyThisLayer();
+ void insertOnlyThisLayer();
+
+ void repaintIncludingDescendants();
+
+ void styleChanged();
+
+ Marquee* marquee() const { return m_marquee; }
+ void suspendMarquees();
+
+ bool isOverflowOnly() const { return m_isOverflowOnly; }
+
+ bool isTransparent() const;
+ RenderLayer* transparentAncestor();
+ void beginTransparencyLayers(GraphicsContext*, const RenderLayer* rootLayer);
+
+ const RenderLayer* root() const
+ {
+ const RenderLayer* curr = this;
+ while (curr->parent())
+ curr = curr->parent();
+ return curr;
+ }
+
+ int xPos() const { return m_x; }
+ int yPos() const { return m_y; }
+ void setPos(int xPos, int yPos)
+ {
+ m_x = xPos;
+ m_y = yPos;
+ }
+
+ int width() const { return m_width; }
+ int height() const { return m_height; }
+ void setWidth(int w) { m_width = w; }
+ void setHeight(int h) { m_height = h; }
+
+ int scrollWidth();
+ int scrollHeight();
+
+ // Scrolling methods for layers that can scroll their overflow.
+ void scrollOffset(int& x, int& y);
+ void subtractScrollOffset(int& x, int& y);
+ int scrollXOffset() const { return m_scrollX + m_scrollOriginX; }
+ int scrollYOffset() const { return m_scrollY; }
+ void scrollToOffset(int x, int y, bool updateScrollbars = true, bool repaint = true);
+ void scrollToXOffset(int x) { scrollToOffset(x, m_scrollY); }
+ void scrollToYOffset(int y) { scrollToOffset(m_scrollX + m_scrollOriginX, y); }
+ void scrollRectToVisible(const IntRect&, const ScrollAlignment& alignX = gAlignCenterIfNeeded, const ScrollAlignment& alignY = gAlignCenterIfNeeded);
+
+ IntRect getRectToExpose(const IntRect& visibleRect, const IntRect& exposeRect, const ScrollAlignment& alignX, const ScrollAlignment& alignY);
+
+ void setHasHorizontalScrollbar(bool);
+ void setHasVerticalScrollbar(bool);
+
+ PassRefPtr<Scrollbar> createScrollbar(ScrollbarOrientation);
+ void destroyScrollbar(ScrollbarOrientation);
+
+ Scrollbar* horizontalScrollbar() { return m_hBar.get(); }
+ Scrollbar* verticalScrollbar() { return m_vBar.get(); }
+
+ PlatformScrollbar* horizontalScrollbarWidget() const;
+ PlatformScrollbar* verticalScrollbarWidget() const;
+
+ int verticalScrollbarWidth() const;
+ int horizontalScrollbarHeight() const;
+
+ void positionOverflowControls();
+ bool isPointInResizeControl(const IntPoint&);
+ bool hitTestOverflowControls(HitTestResult&);
+ IntSize offsetFromResizeCorner(const IntPoint&) const;
+
+ void paintOverflowControls(GraphicsContext*, int tx, int ty, const IntRect& damageRect);
+
+ void updateScrollInfoAfterLayout();
+
+ bool scroll(ScrollDirection, ScrollGranularity, float multiplier = 1.0f);
+ void autoscroll();
+
+ void resize(const PlatformMouseEvent&, const IntSize&);
+ bool inResizeMode() const { return m_inResizeMode; }
+ void setInResizeMode(bool b) { m_inResizeMode = b; }
+
+ void updateLayerPosition();
+ void updateLayerPositions(bool doFullRepaint = false, bool checkForRepaint = true);
+
+ void updateTransform();
+
+ void relativePositionOffset(int& relX, int& relY) { relX += m_relX; relY += m_relY; }
+
+ void clearClipRects();
+ void clearClipRect();
+
+ // Get the enclosing stacking context for this layer. A stacking context is a layer
+ // that has a non-auto z-index.
+ RenderLayer* stackingContext() const;
+ bool isStackingContext() const { return !hasAutoZIndex() || renderer()->isRenderView(); }
+
+ void dirtyZOrderLists();
+ void updateZOrderLists();
+ Vector<RenderLayer*>* posZOrderList() const { return m_posZOrderList; }
+ Vector<RenderLayer*>* negZOrderList() const { return m_negZOrderList; }
+
+ void dirtyOverflowList();
+ void updateOverflowList();
+ Vector<RenderLayer*>* overflowList() const { return m_overflowList; }
+
+ bool hasVisibleContent() const { return m_hasVisibleContent; }
+ void setHasVisibleContent(bool);
+ void dirtyVisibleContentStatus();
+
+ // Gets the nearest enclosing positioned ancestor layer (also includes
+ // the <html> layer and the root layer).
+ RenderLayer* enclosingPositionedAncestor() const;
+
+ void convertToLayerCoords(const RenderLayer* ancestorLayer, int& x, int& y) const;
+
+ bool hasAutoZIndex() const { return renderer()->style()->hasAutoZIndex(); }
+ int zIndex() const { return renderer()->style()->zIndex(); }
+
+ // The two main functions that use the layer system. The paint method
+ // paints the layers that intersect the damage rect from back to
+ // front. The hitTest method looks for mouse events by walking
+ // layers that intersect the point from front to back.
+ void paint(GraphicsContext*, const IntRect& damageRect, PaintRestriction = PaintRestrictionNone, RenderObject* paintingRoot = 0);
+ bool hitTest(const HitTestRequest&, HitTestResult&);
+
+ // This method figures out our layerBounds in coordinates relative to
+ // |rootLayer}. It also computes our background and foreground clip rects
+ // for painting/event handling.
+ void calculateRects(const RenderLayer* rootLayer, const IntRect& paintDirtyRect, IntRect& layerBounds,
+ IntRect& backgroundRect, IntRect& foregroundRect, IntRect& outlineRect) const;
+ void calculateClipRects(const RenderLayer* rootLayer);
+ ClipRects* clipRects() const { return m_clipRects; }
+ IntRect childrenClipRect() const; // Returns the foreground clip rect of the layer in the document's coordinate space.
+ IntRect selfClipRect() const; // Returns the background clip rect of the layer in the document's coordinate space.
+
+ bool intersectsDamageRect(const IntRect& layerBounds, const IntRect& damageRect, const RenderLayer* rootLayer) const;
+
+ // Returns a bounding box for this layer only.
+ IntRect boundingBox(const RenderLayer* rootLayer) const;
+
+ void updateHoverActiveState(const HitTestRequest&, HitTestResult&);
+
+ IntRect repaintRect() const { return m_repaintRect; }
+ void setNeedsFullRepaint(bool f = true) { m_needsFullRepaint = f; }
+
+ int staticX() const { return m_staticX; }
+ int staticY() const { return m_staticY; }
+ void setStaticX(int staticX) { m_staticX = staticX; }
+ void setStaticY(int staticY) { m_staticY = staticY; }
+
+ AffineTransform* transform() const { return m_transform.get(); }
+
+ void destroy(RenderArena*);
+
+ // Overloaded new operator. Derived classes must override operator new
+ // in order to allocate out of the RenderArena.
+ void* operator new(size_t, RenderArena*) throw();
+
+ // Overridden to prevent the normal delete from being called.
+ void operator delete(void*, size_t);
+
+private:
+ // The normal operator new is disallowed on all render objects.
+ void* operator new(size_t) throw();
+
+private:
+ void setNextSibling(RenderLayer* next) { m_next = next; }
+ void setPreviousSibling(RenderLayer* prev) { m_previous = prev; }
+ void setParent(RenderLayer* parent) { m_parent = parent; }
+ void setFirstChild(RenderLayer* first) { m_first = first; }
+ void setLastChild(RenderLayer* last) { m_last = last; }
+
+ void collectLayers(Vector<RenderLayer*>*&, Vector<RenderLayer*>*&);
+
+ void paintLayer(RenderLayer* rootLayer, GraphicsContext*, const IntRect& paintDirtyRect,
+ bool haveTransparency, PaintRestriction, RenderObject* paintingRoot);
+ RenderLayer* hitTestLayer(RenderLayer* rootLayer, const HitTestRequest&, HitTestResult&, const IntRect& hitTestRect, const IntPoint& hitTestPoint);
+ void computeScrollDimensions(bool* needHBar = 0, bool* needVBar = 0);
+
+ bool shouldBeOverflowOnly() const;
+
+ virtual void valueChanged(Scrollbar*);
+ virtual IntRect windowClipRect() const;
+ virtual bool isActive() const;
+
+ void updateOverflowStatus(bool horizontalOverflow, bool verticalOverflow);
+
+ void childVisibilityChanged(bool newVisibility);
+ void dirtyVisibleDescendantStatus();
+ void updateVisibilityStatus();
+
+ Node* enclosingElement() const;
+
+protected:
+ RenderObject* m_object;
+
+ RenderLayer* m_parent;
+ RenderLayer* m_previous;
+ RenderLayer* m_next;
+ RenderLayer* m_first;
+ RenderLayer* m_last;
+
+ IntRect m_repaintRect; // Cached repaint rects. Used by layout.
+ IntRect m_outlineBox;
+
+ // Our current relative position offset.
+ int m_relX;
+ int m_relY;
+
+ // Our (x,y) coordinates are in our parent layer's coordinate space.
+ int m_x;
+ int m_y;
+
+ // The layer's width/height
+ int m_width;
+ int m_height;
+
+ // Our scroll offsets if the view is scrolled.
+ int m_scrollX;
+ int m_scrollY;
+ int m_scrollOriginX;
+ int m_scrollLeftOverflow;
+
+ // The width/height of our scrolled area.
+ int m_scrollWidth;
+ int m_scrollHeight;
+
+ // For layers with overflow, we have a pair of scrollbars.
+ RefPtr<Scrollbar> m_hBar;
+ RefPtr<Scrollbar> m_vBar;
+
+ // Keeps track of whether the layer is currently resizing, so events can cause resizing to start and stop.
+ bool m_inResizeMode;
+
+ // For layers that establish stacking contexts, m_posZOrderList holds a sorted list of all the
+ // descendant layers within the stacking context that have z-indices of 0 or greater
+ // (auto will count as 0). m_negZOrderList holds descendants within our stacking context with negative
+ // z-indices.
+ Vector<RenderLayer*>* m_posZOrderList;
+ Vector<RenderLayer*>* m_negZOrderList;
+
+ // This list contains our overflow child layers.
+ Vector<RenderLayer*>* m_overflowList;
+
+ ClipRects* m_clipRects; // Cached clip rects used when painting and hit testing.
+
+ bool m_scrollDimensionsDirty : 1;
+ bool m_zOrderListsDirty : 1;
+ bool m_overflowListDirty: 1;
+ bool m_isOverflowOnly: 1;
+
+ bool m_usedTransparency : 1; // Tracks whether we need to close a transparent layer, i.e., whether
+ // we ended up painting this layer or any descendants (and therefore need to
+ // blend).
+ bool m_inOverflowRelayout : 1;
+ bool m_needsFullRepaint : 1;
+
+ bool m_overflowStatusDirty : 1;
+ bool m_horizontalOverflow : 1;
+ bool m_verticalOverflow : 1;
+ bool m_visibleContentStatusDirty : 1;
+ bool m_hasVisibleContent : 1;
+ bool m_visibleDescendantStatusDirty : 1;
+ bool m_hasVisibleDescendant : 1;
+
+ Marquee* m_marquee; // Used by layers with overflow:marquee
+
+ // Cached normal flow values for absolute positioned elements with static left/top values.
+ int m_staticX;
+ int m_staticY;
+
+ OwnPtr<AffineTransform> m_transform;
+};
+
+} // namespace WebCore
+
+#endif // RenderLayer_h
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