| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * Copyright (C) 2003, 2006, 2007, 2009 Apple Inc. All rights reserved. |
| * Copyright (C) 2010 Google Inc. All rights reserved. |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 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 |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| * |
| */ |
| |
| #ifndef LayoutBoxModelObject_h |
| #define LayoutBoxModelObject_h |
| |
| #include "core/CoreExport.h" |
| #include "core/layout/LayoutObject.h" |
| #include "core/style/ShadowData.h" |
| #include "platform/geometry/LayoutRect.h" |
| |
| namespace blink { |
| |
| class DeprecatedPaintLayer; |
| class DeprecatedPaintLayerScrollableArea; |
| |
| enum DeprecatedPaintLayerType { |
| NoDeprecatedPaintLayer, |
| NormalDeprecatedPaintLayer, |
| // A forced or overflow clip layer is required for bookkeeping purposes, |
| // but does not force a layer to be self painting. |
| OverflowClipDeprecatedPaintLayer, |
| ForcedDeprecatedPaintLayer |
| }; |
| |
| // Modes for some of the line-related functions. |
| enum LinePositionMode { PositionOnContainingLine, PositionOfInteriorLineBoxes }; |
| enum LineDirectionMode { HorizontalLine, VerticalLine }; |
| typedef unsigned BorderEdgeFlags; |
| |
| enum BackgroundBleedAvoidance { |
| BackgroundBleedNone, |
| BackgroundBleedShrinkBackground, |
| BackgroundBleedClipOnly, |
| BackgroundBleedClipLayer, |
| }; |
| |
| enum ContentChangeType { |
| ImageChanged, |
| CanvasChanged, |
| CanvasContextChanged |
| }; |
| |
| class InlineFlowBox; |
| |
| // This class is the base for all objects that adhere to the CSS box model as described |
| // at http://www.w3.org/TR/CSS21/box.html |
| |
| class CORE_EXPORT LayoutBoxModelObject : public LayoutObject { |
| public: |
| LayoutBoxModelObject(ContainerNode*); |
| virtual ~LayoutBoxModelObject(); |
| |
| // This is the only way layers should ever be destroyed. |
| void destroyLayer(); |
| |
| LayoutSize relativePositionOffset() const; |
| LayoutSize relativePositionLogicalOffset() const { return style()->isHorizontalWritingMode() ? relativePositionOffset() : relativePositionOffset().transposedSize(); } |
| |
| LayoutSize offsetForInFlowPosition() const; |
| |
| // IE extensions. Used to calculate offsetWidth/Height. Overridden by inlines (LayoutFlow) |
| // to return the remaining width on a given line (and the height of a single line). |
| virtual LayoutUnit offsetLeft() const; |
| virtual LayoutUnit offsetTop() const; |
| virtual LayoutUnit offsetWidth() const = 0; |
| virtual LayoutUnit offsetHeight() const = 0; |
| |
| int pixelSnappedOffsetLeft() const { return roundToInt(offsetLeft()); } |
| int pixelSnappedOffsetTop() const { return roundToInt(offsetTop()); } |
| virtual int pixelSnappedOffsetWidth() const; |
| virtual int pixelSnappedOffsetHeight() const; |
| |
| bool hasSelfPaintingLayer() const; |
| DeprecatedPaintLayer* layer() const { return m_layer.get(); } |
| DeprecatedPaintLayerScrollableArea* scrollableArea() const; |
| |
| virtual void updateFromStyle(); |
| |
| virtual DeprecatedPaintLayerType layerTypeRequired() const = 0; |
| |
| // This will work on inlines to return the bounding box of all of the lines' border boxes. |
| virtual IntRect borderBoundingBox() const = 0; |
| |
| // Checks if this box, or any of it's descendants, or any of it's continuations, |
| // will take up space in the layout of the page. |
| bool hasNonEmptyLayoutSize() const; |
| |
| // These return the CSS computed padding values. |
| LayoutUnit computedCSSPaddingTop() const { return computedCSSPadding(style()->paddingTop()); } |
| LayoutUnit computedCSSPaddingBottom() const { return computedCSSPadding(style()->paddingBottom()); } |
| LayoutUnit computedCSSPaddingLeft() const { return computedCSSPadding(style()->paddingLeft()); } |
| LayoutUnit computedCSSPaddingRight() const { return computedCSSPadding(style()->paddingRight()); } |
| LayoutUnit computedCSSPaddingBefore() const { return computedCSSPadding(style()->paddingBefore()); } |
| LayoutUnit computedCSSPaddingAfter() const { return computedCSSPadding(style()->paddingAfter()); } |
| LayoutUnit computedCSSPaddingStart() const { return computedCSSPadding(style()->paddingStart()); } |
| LayoutUnit computedCSSPaddingEnd() const { return computedCSSPadding(style()->paddingEnd()); } |
| |
| // These functions are used during layout. Table cells |
| // override them to include some extra intrinsic padding. |
| virtual LayoutUnit paddingTop() const { return computedCSSPaddingTop(); } |
| virtual LayoutUnit paddingBottom() const { return computedCSSPaddingBottom(); } |
| virtual LayoutUnit paddingLeft() const { return computedCSSPaddingLeft(); } |
| virtual LayoutUnit paddingRight() const { return computedCSSPaddingRight(); } |
| virtual LayoutUnit paddingBefore() const { return computedCSSPaddingBefore(); } |
| virtual LayoutUnit paddingAfter() const { return computedCSSPaddingAfter(); } |
| virtual LayoutUnit paddingStart() const { return computedCSSPaddingStart(); } |
| virtual LayoutUnit paddingEnd() const { return computedCSSPaddingEnd(); } |
| |
| virtual int borderTop() const { return style()->borderTopWidth(); } |
| virtual int borderBottom() const { return style()->borderBottomWidth(); } |
| virtual int borderLeft() const { return style()->borderLeftWidth(); } |
| virtual int borderRight() const { return style()->borderRightWidth(); } |
| virtual int borderBefore() const { return style()->borderBeforeWidth(); } |
| virtual int borderAfter() const { return style()->borderAfterWidth(); } |
| virtual int borderStart() const { return style()->borderStartWidth(); } |
| virtual int borderEnd() const { return style()->borderEndWidth(); } |
| |
| int borderWidth() const { return borderLeft() + borderRight(); } |
| int borderHeight() const { return borderTop() + borderBottom(); } |
| |
| // Insets from the border box to the inside of the border. |
| LayoutRectOutsets borderInsets() const { return LayoutRectOutsets(-borderTop(), -borderRight(), -borderBottom(), -borderLeft()); } |
| |
| bool hasBorderOrPadding() const { return style()->hasBorder() || style()->hasPadding(); } |
| |
| LayoutUnit borderAndPaddingStart() const { return borderStart() + paddingStart(); } |
| LayoutUnit borderAndPaddingBefore() const { return borderBefore() + paddingBefore(); } |
| LayoutUnit borderAndPaddingAfter() const { return borderAfter() + paddingAfter(); } |
| |
| LayoutUnit borderAndPaddingHeight() const { return borderTop() + borderBottom() + paddingTop() + paddingBottom(); } |
| LayoutUnit borderAndPaddingWidth() const { return borderLeft() + borderRight() + paddingLeft() + paddingRight(); } |
| LayoutUnit borderAndPaddingLogicalHeight() const { return hasBorderOrPadding() ? borderAndPaddingBefore() + borderAndPaddingAfter() : LayoutUnit(); } |
| LayoutUnit borderAndPaddingLogicalWidth() const { return borderStart() + borderEnd() + paddingStart() + paddingEnd(); } |
| LayoutUnit borderAndPaddingLogicalLeft() const { return style()->isHorizontalWritingMode() ? borderLeft() + paddingLeft() : borderTop() + paddingTop(); } |
| |
| LayoutUnit borderLogicalLeft() const { return style()->isHorizontalWritingMode() ? borderLeft() : borderTop(); } |
| |
| LayoutUnit paddingLogicalWidth() const { return paddingStart() + paddingEnd(); } |
| LayoutUnit paddingLogicalHeight() const { return paddingBefore() + paddingAfter(); } |
| |
| virtual LayoutRectOutsets marginBoxOutsets() const = 0; |
| virtual LayoutUnit marginTop() const = 0; |
| virtual LayoutUnit marginBottom() const = 0; |
| virtual LayoutUnit marginLeft() const = 0; |
| virtual LayoutUnit marginRight() const = 0; |
| virtual LayoutUnit marginBefore(const ComputedStyle* otherStyle = nullptr) const = 0; |
| virtual LayoutUnit marginAfter(const ComputedStyle* otherStyle = nullptr) const = 0; |
| virtual LayoutUnit marginStart(const ComputedStyle* otherStyle = nullptr) const = 0; |
| virtual LayoutUnit marginEnd(const ComputedStyle* otherStyle = nullptr) const = 0; |
| LayoutUnit marginHeight() const { return marginTop() + marginBottom(); } |
| LayoutUnit marginWidth() const { return marginLeft() + marginRight(); } |
| LayoutUnit marginLogicalHeight() const { return marginBefore() + marginAfter(); } |
| LayoutUnit marginLogicalWidth() const { return marginStart() + marginEnd(); } |
| |
| bool hasInlineDirectionBordersPaddingOrMargin() const { return hasInlineDirectionBordersOrPadding() || marginStart() || marginEnd(); } |
| bool hasInlineDirectionBordersOrPadding() const { return borderStart() || borderEnd() || paddingStart() || paddingEnd(); } |
| |
| virtual LayoutUnit containingBlockLogicalWidthForContent() const; |
| |
| virtual void childBecameNonInline(LayoutObject* /*child*/) { } |
| |
| virtual bool boxShadowShouldBeAppliedToBackground(BackgroundBleedAvoidance, InlineFlowBox* = nullptr) const; |
| |
| // Overridden by subclasses to determine line height and baseline position. |
| virtual LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const = 0; |
| virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const = 0; |
| |
| virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const override; |
| virtual const LayoutObject* pushMappingToContainer(const LayoutBoxModelObject* ancestorToStopAt, LayoutGeometryMap&) const override; |
| |
| virtual void setSelectionState(SelectionState) override; |
| |
| void contentChanged(ContentChangeType); |
| bool hasAcceleratedCompositing() const; |
| |
| virtual void computeLayerHitTestRects(LayerHitTestRects&) const override; |
| |
| // Returns true if the background is painted opaque in the given rect. |
| // The query rect is given in local coordinate system. |
| virtual bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const { return false; } |
| |
| virtual void invalidateTreeIfNeeded(PaintInvalidationState&) override; |
| |
| // Indicate that the contents of this layoutObject need to be repainted. Only has an effect if compositing is being used, |
| void setBackingNeedsPaintInvalidationInRect(const LayoutRect&, PaintInvalidationReason) const; // r is in the coordinate space of this layout object |
| |
| void invalidateDisplayItemClientOnBacking(const DisplayItemClientWrapper&) const; |
| |
| // http://www.w3.org/TR/css3-background/#body-background |
| // <html> root element with no background steals background from its first <body> child. |
| // The used background for such body element should be the initial value. (i.e. transparent) |
| bool backgroundStolenForBeingBody(const ComputedStyle* rootElementStyle = nullptr) const; |
| |
| protected: |
| virtual void willBeDestroyed() override; |
| |
| LayoutPoint adjustedPositionRelativeToOffsetParent(const LayoutPoint&) const; |
| |
| bool calculateHasBoxDecorations() const; |
| |
| LayoutBoxModelObject* continuation() const; |
| void setContinuation(LayoutBoxModelObject*); |
| |
| LayoutRect localCaretRectForEmptyElement(LayoutUnit width, LayoutUnit textIndentOffset); |
| |
| bool hasAutoHeightOrContainingBlockWithAutoHeight() const; |
| LayoutBlock* containingBlockForAutoHeightDetection(Length logicalHeight) const; |
| |
| void addFocusRingRectsForNormalChildren(Vector<LayoutRect>&, const LayoutPoint& additionalOffset) const; |
| void addFocusRingRectsForDescendant(const LayoutObject& descendant, Vector<LayoutRect>&, const LayoutPoint& additionalOffset) const; |
| |
| virtual void addLayerHitTestRects(LayerHitTestRects&, const DeprecatedPaintLayer*, const LayoutPoint&, const LayoutRect&) const override; |
| |
| void styleWillChange(StyleDifference, const ComputedStyle& newStyle) override; |
| void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override; |
| |
| public: |
| // These functions are only used internally to manipulate the layout tree structure via remove/insert/appendChildNode. |
| // Since they are typically called only to move objects around within anonymous blocks (which only have layers in |
| // the case of column spans), the default for fullRemoveInsert is false rather than true. |
| void moveChildTo(LayoutBoxModelObject* toBoxModelObject, LayoutObject* child, LayoutObject* beforeChild, bool fullRemoveInsert = false); |
| void moveChildTo(LayoutBoxModelObject* toBoxModelObject, LayoutObject* child, bool fullRemoveInsert = false) |
| { |
| moveChildTo(toBoxModelObject, child, 0, fullRemoveInsert); |
| } |
| void moveAllChildrenTo(LayoutBoxModelObject* toBoxModelObject, bool fullRemoveInsert = false) |
| { |
| moveAllChildrenTo(toBoxModelObject, 0, fullRemoveInsert); |
| } |
| void moveAllChildrenTo(LayoutBoxModelObject* toBoxModelObject, LayoutObject* beforeChild, bool fullRemoveInsert = false) |
| { |
| moveChildrenTo(toBoxModelObject, slowFirstChild(), 0, beforeChild, fullRemoveInsert); |
| } |
| // Move all of the kids from |startChild| up to but excluding |endChild|. 0 can be passed as the |endChild| to denote |
| // that all the kids from |startChild| onwards should be moved. |
| void moveChildrenTo(LayoutBoxModelObject* toBoxModelObject, LayoutObject* startChild, LayoutObject* endChild, bool fullRemoveInsert = false) |
| { |
| moveChildrenTo(toBoxModelObject, startChild, endChild, 0, fullRemoveInsert); |
| } |
| virtual void moveChildrenTo(LayoutBoxModelObject* toBoxModelObject, LayoutObject* startChild, LayoutObject* endChild, LayoutObject* beforeChild, bool fullRemoveInsert = false); |
| |
| enum ScaleByEffectiveZoomOrNot { ScaleByEffectiveZoom, DoNotScaleByEffectiveZoom }; |
| IntSize calculateImageIntrinsicDimensions(StyleImage*, const IntSize& scaledPositioningAreaSize, ScaleByEffectiveZoomOrNot) const; |
| |
| private: |
| void createLayer(DeprecatedPaintLayerType); |
| |
| LayoutUnit computedCSSPadding(const Length&) const; |
| virtual bool isBoxModelObject() const override final { return true; } |
| |
| OwnPtr<DeprecatedPaintLayer> m_layer; |
| }; |
| |
| DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBoxModelObject, isBoxModelObject()); |
| |
| } // namespace blink |
| |
| #endif // LayoutBoxModelObject_h |