1 /* 2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org) 3 * (C) 1999 Antti Koivisto (koivisto@kde.org) 4 * Copyright (C) 2003, 2006, 2007, 2009 Apple Inc. All rights reserved. 5 * Copyright (C) 2010 Google Inc. All rights reserved. 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Library General Public 9 * License as published by the Free Software Foundation; either 10 * version 2 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Library General Public License for more details. 16 * 17 * You should have received a copy of the GNU Library General Public License 18 * along with this library; see the file COPYING.LIB. If not, write to 19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 20 * Boston, MA 02110-1301, USA. 21 * 22 */ 23 24 #ifndef RenderBoxModelObject_h 25 #define RenderBoxModelObject_h 26 27 #include "core/rendering/RenderLayerModelObject.h" 28 #include "core/rendering/style/ShadowData.h" 29 #include "platform/geometry/LayoutRect.h" 30 31 namespace blink { 32 33 // Modes for some of the line-related functions. 34 enum LinePositionMode { PositionOnContainingLine, PositionOfInteriorLineBoxes }; 35 enum LineDirectionMode { HorizontalLine, VerticalLine }; 36 typedef unsigned BorderEdgeFlags; 37 38 enum BackgroundBleedAvoidance { 39 BackgroundBleedNone, 40 BackgroundBleedShrinkBackground, 41 BackgroundBleedClipBackground, 42 BackgroundBleedBackgroundOverBorder 43 }; 44 45 enum ContentChangeType { 46 ImageChanged, 47 CanvasChanged, 48 CanvasContextChanged 49 }; 50 51 class RenderTextFragment; 52 class BackgroundImageGeometry; 53 54 // This class is the base for all objects that adhere to the CSS box model as described 55 // at http://www.w3.org/TR/CSS21/box.html 56 57 class RenderBoxModelObject : public RenderLayerModelObject { 58 public: 59 RenderBoxModelObject(ContainerNode*); 60 virtual ~RenderBoxModelObject(); 61 62 LayoutSize relativePositionOffset() const; relativePositionLogicalOffset()63 LayoutSize relativePositionLogicalOffset() const { return style()->isHorizontalWritingMode() ? relativePositionOffset() : relativePositionOffset().transposedSize(); } 64 65 LayoutSize offsetForInFlowPosition() const; 66 67 // IE extensions. Used to calculate offsetWidth/Height. Overridden by inlines (RenderFlow) 68 // to return the remaining width on a given line (and the height of a single line). 69 virtual LayoutUnit offsetLeft() const; 70 virtual LayoutUnit offsetTop() const; 71 virtual LayoutUnit offsetWidth() const = 0; 72 virtual LayoutUnit offsetHeight() const = 0; 73 pixelSnappedOffsetLeft()74 int pixelSnappedOffsetLeft() const { return roundToInt(offsetLeft()); } pixelSnappedOffsetTop()75 int pixelSnappedOffsetTop() const { return roundToInt(offsetTop()); } 76 virtual int pixelSnappedOffsetWidth() const; 77 virtual int pixelSnappedOffsetHeight() const; 78 79 virtual void updateFromStyle() OVERRIDE; 80 81 // This will work on inlines to return the bounding box of all of the lines' border boxes. 82 virtual IntRect borderBoundingBox() const = 0; 83 84 // These return the CSS computed padding values. computedCSSPaddingTop()85 LayoutUnit computedCSSPaddingTop() const { return computedCSSPadding(style()->paddingTop()); } computedCSSPaddingBottom()86 LayoutUnit computedCSSPaddingBottom() const { return computedCSSPadding(style()->paddingBottom()); } computedCSSPaddingLeft()87 LayoutUnit computedCSSPaddingLeft() const { return computedCSSPadding(style()->paddingLeft()); } computedCSSPaddingRight()88 LayoutUnit computedCSSPaddingRight() const { return computedCSSPadding(style()->paddingRight()); } computedCSSPaddingBefore()89 LayoutUnit computedCSSPaddingBefore() const { return computedCSSPadding(style()->paddingBefore()); } computedCSSPaddingAfter()90 LayoutUnit computedCSSPaddingAfter() const { return computedCSSPadding(style()->paddingAfter()); } computedCSSPaddingStart()91 LayoutUnit computedCSSPaddingStart() const { return computedCSSPadding(style()->paddingStart()); } computedCSSPaddingEnd()92 LayoutUnit computedCSSPaddingEnd() const { return computedCSSPadding(style()->paddingEnd()); } 93 94 // These functions are used during layout. Table cells 95 // override them to include some extra intrinsic padding. paddingTop()96 virtual LayoutUnit paddingTop() const { return computedCSSPaddingTop(); } paddingBottom()97 virtual LayoutUnit paddingBottom() const { return computedCSSPaddingBottom(); } paddingLeft()98 virtual LayoutUnit paddingLeft() const { return computedCSSPaddingLeft(); } paddingRight()99 virtual LayoutUnit paddingRight() const { return computedCSSPaddingRight(); } paddingBefore()100 virtual LayoutUnit paddingBefore() const { return computedCSSPaddingBefore(); } paddingAfter()101 virtual LayoutUnit paddingAfter() const { return computedCSSPaddingAfter(); } paddingStart()102 virtual LayoutUnit paddingStart() const { return computedCSSPaddingStart(); } paddingEnd()103 virtual LayoutUnit paddingEnd() const { return computedCSSPaddingEnd(); } 104 borderTop()105 virtual int borderTop() const { return style()->borderTopWidth(); } borderBottom()106 virtual int borderBottom() const { return style()->borderBottomWidth(); } borderLeft()107 virtual int borderLeft() const { return style()->borderLeftWidth(); } borderRight()108 virtual int borderRight() const { return style()->borderRightWidth(); } borderBefore()109 virtual int borderBefore() const { return style()->borderBeforeWidth(); } borderAfter()110 virtual int borderAfter() const { return style()->borderAfterWidth(); } borderStart()111 virtual int borderStart() const { return style()->borderStartWidth(); } borderEnd()112 virtual int borderEnd() const { return style()->borderEndWidth(); } 113 borderWidth()114 int borderWidth() const { return borderLeft() + borderRight(); } borderHeight()115 int borderHeight() const { return borderTop() + borderBottom(); } 116 borderAndPaddingStart()117 LayoutUnit borderAndPaddingStart() const { return borderStart() + paddingStart(); } borderAndPaddingBefore()118 LayoutUnit borderAndPaddingBefore() const { return borderBefore() + paddingBefore(); } borderAndPaddingAfter()119 LayoutUnit borderAndPaddingAfter() const { return borderAfter() + paddingAfter(); } 120 borderAndPaddingHeight()121 LayoutUnit borderAndPaddingHeight() const { return borderTop() + borderBottom() + paddingTop() + paddingBottom(); } borderAndPaddingWidth()122 LayoutUnit borderAndPaddingWidth() const { return borderLeft() + borderRight() + paddingLeft() + paddingRight(); } borderAndPaddingLogicalHeight()123 LayoutUnit borderAndPaddingLogicalHeight() const { return borderAndPaddingBefore() + borderAndPaddingAfter(); } borderAndPaddingLogicalWidth()124 LayoutUnit borderAndPaddingLogicalWidth() const { return borderStart() + borderEnd() + paddingStart() + paddingEnd(); } borderAndPaddingLogicalLeft()125 LayoutUnit borderAndPaddingLogicalLeft() const { return style()->isHorizontalWritingMode() ? borderLeft() + paddingLeft() : borderTop() + paddingTop(); } 126 127 borderLogicalLeft()128 LayoutUnit borderLogicalLeft() const { return style()->isHorizontalWritingMode() ? borderLeft() : borderTop(); } borderLogicalRight()129 LayoutUnit borderLogicalRight() const { return style()->isHorizontalWritingMode() ? borderRight() : borderBottom(); } borderLogicalWidth()130 LayoutUnit borderLogicalWidth() const { return borderStart() + borderEnd(); } borderLogicalHeight()131 LayoutUnit borderLogicalHeight() const { return borderBefore() + borderAfter(); } 132 paddingLogicalLeft()133 LayoutUnit paddingLogicalLeft() const { return style()->isHorizontalWritingMode() ? paddingLeft() : paddingTop(); } paddingLogicalRight()134 LayoutUnit paddingLogicalRight() const { return style()->isHorizontalWritingMode() ? paddingRight() : paddingBottom(); } paddingLogicalWidth()135 LayoutUnit paddingLogicalWidth() const { return paddingStart() + paddingEnd(); } paddingLogicalHeight()136 LayoutUnit paddingLogicalHeight() const { return paddingBefore() + paddingAfter(); } 137 138 virtual LayoutUnit marginTop() const = 0; 139 virtual LayoutUnit marginBottom() const = 0; 140 virtual LayoutUnit marginLeft() const = 0; 141 virtual LayoutUnit marginRight() const = 0; 142 virtual LayoutUnit marginBefore(const RenderStyle* otherStyle = 0) const = 0; 143 virtual LayoutUnit marginAfter(const RenderStyle* otherStyle = 0) const = 0; 144 virtual LayoutUnit marginStart(const RenderStyle* otherStyle = 0) const = 0; 145 virtual LayoutUnit marginEnd(const RenderStyle* otherStyle = 0) const = 0; marginHeight()146 LayoutUnit marginHeight() const { return marginTop() + marginBottom(); } marginWidth()147 LayoutUnit marginWidth() const { return marginLeft() + marginRight(); } marginLogicalHeight()148 LayoutUnit marginLogicalHeight() const { return marginBefore() + marginAfter(); } marginLogicalWidth()149 LayoutUnit marginLogicalWidth() const { return marginStart() + marginEnd(); } 150 hasInlineDirectionBordersPaddingOrMargin()151 bool hasInlineDirectionBordersPaddingOrMargin() const { return hasInlineDirectionBordersOrPadding() || marginStart()|| marginEnd(); } hasInlineDirectionBordersOrPadding()152 bool hasInlineDirectionBordersOrPadding() const { return borderStart() || borderEnd() || paddingStart()|| paddingEnd(); } 153 154 virtual LayoutUnit containingBlockLogicalWidthForContent() const; 155 childBecameNonInline(RenderObject *)156 virtual void childBecameNonInline(RenderObject* /*child*/) { } 157 158 virtual bool boxShadowShouldBeAppliedToBackground(BackgroundBleedAvoidance, InlineFlowBox* = 0) const; 159 160 // Overridden by subclasses to determine line height and baseline position. 161 virtual LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const = 0; 162 virtual int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const = 0; 163 164 virtual void mapAbsoluteToLocalPoint(MapCoordinatesFlags, TransformState&) const OVERRIDE; 165 virtual const RenderObject* pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&) const OVERRIDE; 166 167 virtual void setSelectionState(SelectionState) OVERRIDE; 168 169 void contentChanged(ContentChangeType); 170 bool hasAcceleratedCompositing() const; 171 172 virtual void computeLayerHitTestRects(LayerHitTestRects&) const OVERRIDE; 173 174 protected: 175 virtual void willBeDestroyed() OVERRIDE; 176 177 LayoutPoint adjustedPositionRelativeToOffsetParent(const LayoutPoint&) const; 178 179 bool calculateHasBoxDecorations() const; 180 181 RenderBoxModelObject* continuation() const; 182 void setContinuation(RenderBoxModelObject*); 183 184 LayoutRect localCaretRectForEmptyElement(LayoutUnit width, LayoutUnit textIndentOffset); 185 186 bool hasAutoHeightOrContainingBlockWithAutoHeight() const; 187 188 public: 189 190 // For RenderBlocks and RenderInlines with m_style->styleType() == FIRST_LETTER, this tracks their remaining text fragments 191 RenderTextFragment* firstLetterRemainingText() const; 192 void setFirstLetterRemainingText(RenderTextFragment*); 193 194 // These functions are only used internally to manipulate the render tree structure via remove/insert/appendChildNode. 195 // Since they are typically called only to move objects around within anonymous blocks (which only have layers in 196 // the case of column spans), the default for fullRemoveInsert is false rather than true. 197 void moveChildTo(RenderBoxModelObject* toBoxModelObject, RenderObject* child, RenderObject* beforeChild, bool fullRemoveInsert = false); 198 void moveChildTo(RenderBoxModelObject* toBoxModelObject, RenderObject* child, bool fullRemoveInsert = false) 199 { 200 moveChildTo(toBoxModelObject, child, 0, fullRemoveInsert); 201 } 202 void moveAllChildrenTo(RenderBoxModelObject* toBoxModelObject, bool fullRemoveInsert = false) 203 { 204 moveAllChildrenTo(toBoxModelObject, 0, fullRemoveInsert); 205 } 206 void moveAllChildrenTo(RenderBoxModelObject* toBoxModelObject, RenderObject* beforeChild, bool fullRemoveInsert = false) 207 { 208 moveChildrenTo(toBoxModelObject, slowFirstChild(), 0, beforeChild, fullRemoveInsert); 209 } 210 // Move all of the kids from |startChild| up to but excluding |endChild|. 0 can be passed as the |endChild| to denote 211 // that all the kids from |startChild| onwards should be moved. 212 void moveChildrenTo(RenderBoxModelObject* toBoxModelObject, RenderObject* startChild, RenderObject* endChild, bool fullRemoveInsert = false) 213 { 214 moveChildrenTo(toBoxModelObject, startChild, endChild, 0, fullRemoveInsert); 215 } 216 void moveChildrenTo(RenderBoxModelObject* toBoxModelObject, RenderObject* startChild, RenderObject* endChild, RenderObject* beforeChild, bool fullRemoveInsert = false); 217 218 enum ScaleByEffectiveZoomOrNot { ScaleByEffectiveZoom, DoNotScaleByEffectiveZoom }; 219 IntSize calculateImageIntrinsicDimensions(StyleImage*, const IntSize& scaledPositioningAreaSize, ScaleByEffectiveZoomOrNot) const; 220 221 private: 222 LayoutUnit computedCSSPadding(const Length&) const; isBoxModelObject()223 virtual bool isBoxModelObject() const OVERRIDE FINAL { return true; } 224 }; 225 226 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderBoxModelObject, isBoxModelObject()); 227 228 } // namespace blink 229 230 #endif // RenderBoxModelObject_h 231