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|
/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* Copyright (C) 2003, 2006, 2007 Apple 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 LayoutBox_h
#define LayoutBox_h
#include "core/CoreExport.h"
#include "core/layout/LayoutBoxModelObject.h"
#include "core/layout/OverflowModel.h"
#include "platform/scroll/ScrollTypes.h"
#include "platform/scroll/ScrollableArea.h"
namespace blink {
class LayoutBlockFlow;
class LayoutMultiColumnSpannerPlaceholder;
class ShapeOutsideInfo;
struct PaintInfo;
enum SizeType { MainOrPreferredSize, MinSize, MaxSize };
enum AvailableLogicalHeightType { ExcludeMarginBorderPadding, IncludeMarginBorderPadding };
enum OverlayScrollbarSizeRelevancy { IgnoreOverlayScrollbarSize, IncludeOverlayScrollbarSize };
enum MarginDirection { BlockDirection, InlineDirection };
enum ShouldComputePreferred { ComputeActual, ComputePreferred };
enum ScrollOffsetClamping {
ScrollOffsetUnclamped,
ScrollOffsetClamped
};
struct LayoutBoxRareData {
WTF_MAKE_NONCOPYABLE(LayoutBoxRareData); USING_FAST_MALLOC(LayoutBoxRareData);
public:
LayoutBoxRareData()
: m_spannerPlaceholder(nullptr)
, m_overrideLogicalContentHeight(-1)
, m_overrideLogicalContentWidth(-1)
, m_previousBorderBoxSize(LayoutUnit(-1), LayoutUnit(-1))
, m_percentHeightContainer(nullptr)
{
}
// For spanners, the spanner placeholder that lays us out within the multicol container.
LayoutMultiColumnSpannerPlaceholder* m_spannerPlaceholder;
LayoutUnit m_overrideLogicalContentHeight;
LayoutUnit m_overrideLogicalContentWidth;
// Set by LayoutBox::savePreviousBoxSizesIfNeeded().
LayoutSize m_previousBorderBoxSize;
LayoutRect m_previousContentBoxRect;
LayoutRect m_previousLayoutOverflowRect;
LayoutUnit m_pageLogicalOffset;
LayoutUnit m_paginationStrut;
LayoutBlock* m_percentHeightContainer;
};
// LayoutBox implements the full CSS box model.
//
// LayoutBoxModelObject only introduces some abstractions for LayoutInline and
// LayoutBox. The logic for the model is in LayoutBox, e.g. the storage for the
// rectangle and offset forming the CSS box (m_frameRect) and the getters for
// the different boxes.
//
// LayoutBox is also the uppermost class to support scrollbars, however the
// logic is delegated to PaintLayerScrollableArea.
// Per the CSS specification, scrollbars should "be inserted between the inner
// border edge and the outer padding edge".
// (see http://www.w3.org/TR/CSS21/visufx.html#overflow)
// Also the scrollbar width / height are removed from the content box. Taking
// the following example:
//
// <!DOCTYPE html>
// <style>
// ::-webkit-scrollbar {
// /* Force non-overlay scrollbars */
// width: 10px;
// height: 20px;
// }
// </style>
// <div style="overflow:scroll; width: 100px; height: 100px">
//
// The <div>'s content box is not 100x100 as specified in the style but 90x80 as
// we remove the scrollbars from the box.
//
// The presence of scrollbars is determined by the 'overflow' property and can
// be conditioned on having layout overflow (see OverflowModel for more details
// on how we track overflow).
//
// There are 2 types of scrollbars:
// - non-overlay scrollbars take space from the content box.
// - overlay scrollbars don't and just overlay hang off from the border box,
// potentially overlapping with the padding box's content.
// For more details on scrollbars, see PaintLayerScrollableArea.
//
//
// ***** THE BOX MODEL *****
// The CSS box model is based on a series of nested boxes:
// http://www.w3.org/TR/CSS21/box.html
//
// |----------------------------------------------------|
// | |
// | margin-top |
// | |
// | |-----------------------------------------| |
// | | | |
// | | border-top | |
// | | | |
// | | |--------------------------|----| | |
// | | | | | | |
// | | | padding-top |####| | |
// | | | |####| | |
// | | | |----------------| |####| | |
// | | | | | | | | |
// | ML | BL | PL | content box | PR | SW | BR | MR |
// | | | | | | | | |
// | | | |----------------| | | | |
// | | | | | | |
// | | | padding-bottom | | | |
// | | |--------------------------|----| | |
// | | | ####| | | |
// | | | scrollbar height ####| SC | | |
// | | | ####| | | |
// | | |-------------------------------| | |
// | | | |
// | | border-bottom | |
// | | | |
// | |-----------------------------------------| |
// | |
// | margin-bottom |
// | |
// |----------------------------------------------------|
//
// BL = border-left
// BR = border-right
// ML = margin-left
// MR = margin-right
// PL = padding-left
// PR = padding-right
// SC = scroll corner (contains UI for resizing (see the 'resize' property)
// SW = scrollbar width
//
// Those are just the boxes from the CSS model. Extra boxes are tracked by Blink
// (e.g. the overflows). Thus it is paramount to know which box a function is
// manipulating. Also of critical importance is the coordinate system used (see
// the COORDINATE SYSTEMS section in LayoutBoxModelObject).
class CORE_EXPORT LayoutBox : public LayoutBoxModelObject {
public:
explicit LayoutBox(ContainerNode*);
PaintLayerType layerTypeRequired() const override;
bool backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const override;
virtual bool backgroundShouldAlwaysBeClipped() const { return false; }
// Use this with caution! No type checking is done!
LayoutBox* firstChildBox() const;
LayoutBox* lastChildBox() const;
int pixelSnappedWidth() const { return m_frameRect.pixelSnappedWidth(); }
int pixelSnappedHeight() const { return m_frameRect.pixelSnappedHeight(); }
void setX(LayoutUnit x)
{
if (x == m_frameRect.x())
return;
m_frameRect.setX(x);
frameRectChanged();
}
void setY(LayoutUnit y)
{
if (y == m_frameRect.y())
return;
m_frameRect.setY(y);
frameRectChanged();
}
void setWidth(LayoutUnit width)
{
if (width == m_frameRect.width())
return;
m_frameRect.setWidth(width);
frameRectChanged();
}
void setHeight(LayoutUnit height)
{
if (height == m_frameRect.height())
return;
m_frameRect.setHeight(height);
frameRectChanged();
}
LayoutUnit logicalLeft() const { return style()->isHorizontalWritingMode() ? m_frameRect.x() : m_frameRect.y(); }
LayoutUnit logicalRight() const { return logicalLeft() + logicalWidth(); }
LayoutUnit logicalTop() const { return style()->isHorizontalWritingMode() ? m_frameRect.y() : m_frameRect.x(); }
LayoutUnit logicalBottom() const { return logicalTop() + logicalHeight(); }
LayoutUnit logicalWidth() const { return style()->isHorizontalWritingMode() ? m_frameRect.width() : m_frameRect.height(); }
LayoutUnit logicalHeight() const { return style()->isHorizontalWritingMode() ? m_frameRect.height() : m_frameRect.width(); }
LayoutUnit constrainLogicalWidthByMinMax(LayoutUnit, LayoutUnit, LayoutBlock*) const;
LayoutUnit constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const;
LayoutUnit constrainContentBoxLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const;
int pixelSnappedLogicalHeight() const { return style()->isHorizontalWritingMode() ? pixelSnappedHeight() : pixelSnappedWidth(); }
int pixelSnappedLogicalWidth() const { return style()->isHorizontalWritingMode() ? pixelSnappedWidth() : pixelSnappedHeight(); }
LayoutUnit minimumLogicalHeightForEmptyLine() const
{
return borderAndPaddingLogicalHeight() + scrollbarLogicalHeight()
+ lineHeight(true, isHorizontalWritingMode() ? HorizontalLine : VerticalLine, PositionOfInteriorLineBoxes);
}
void setLogicalLeft(LayoutUnit left)
{
if (style()->isHorizontalWritingMode())
setX(left);
else
setY(left);
}
void setLogicalTop(LayoutUnit top)
{
if (style()->isHorizontalWritingMode())
setY(top);
else
setX(top);
}
void setLogicalLocation(const LayoutPoint& location)
{
if (style()->isHorizontalWritingMode())
setLocation(location);
else
setLocation(location.transposedPoint());
}
void setLogicalWidth(LayoutUnit size)
{
if (style()->isHorizontalWritingMode())
setWidth(size);
else
setHeight(size);
}
void setLogicalHeight(LayoutUnit size)
{
if (style()->isHorizontalWritingMode())
setHeight(size);
else
setWidth(size);
}
LayoutPoint location() const { return m_frameRect.location(); }
LayoutSize locationOffset() const { return LayoutSize(m_frameRect.x(), m_frameRect.y()); }
LayoutSize size() const { return m_frameRect.size(); }
IntSize pixelSnappedSize() const { return m_frameRect.pixelSnappedSize(); }
void setLocation(const LayoutPoint& location)
{
if (location == m_frameRect.location())
return;
m_frameRect.setLocation(location);
frameRectChanged();
}
// FIXME: Currently scrollbars are using int geometry and positioned based on
// pixelSnappedBorderBoxRect whose size may change when location changes because of
// pixel snapping. This function is used to change location of the LayoutBox outside
// of LayoutBox::layout(). Will remove when we use LayoutUnits for scrollbars.
void setLocationAndUpdateOverflowControlsIfNeeded(const LayoutPoint&);
void setSize(const LayoutSize& size)
{
if (size == m_frameRect.size())
return;
m_frameRect.setSize(size);
frameRectChanged();
}
void move(LayoutUnit dx, LayoutUnit dy)
{
if (!dx && !dy)
return;
m_frameRect.move(dx, dy);
frameRectChanged();
}
// This function is in the container's coordinate system, meaning
// that it includes the logical top/left offset and the
// inline-start/block-start margins.
LayoutRect frameRect() const { return m_frameRect; }
void setFrameRect(const LayoutRect& rect)
{
if (rect == m_frameRect)
return;
m_frameRect = rect;
frameRectChanged();
}
// Note that those functions have their origin at this box's CSS border box.
// As such their location doesn't account for 'top'/'left'.
LayoutRect borderBoxRect() const { return LayoutRect(LayoutPoint(), size()); }
LayoutRect paddingBoxRect() const { return LayoutRect(LayoutUnit(borderLeft()), LayoutUnit(borderTop()), clientWidth(), clientHeight()); }
IntRect pixelSnappedBorderBoxRect() const { return IntRect(IntPoint(), m_frameRect.pixelSnappedSize()); }
IntRect borderBoundingBox() const final { return pixelSnappedBorderBoxRect(); }
// The content area of the box (excludes padding - and intrinsic padding for table cells, etc... - and border).
LayoutRect contentBoxRect() const { return LayoutRect(borderLeft() + paddingLeft(), borderTop() + paddingTop(), contentWidth(), contentHeight()); }
LayoutSize contentBoxOffset() const { return LayoutSize(borderLeft() + paddingLeft(), borderTop() + paddingTop()); }
// The content box in absolute coords. Ignores transforms.
IntRect absoluteContentBox() const;
// The offset of the content box in absolute coords, ignoring transforms.
IntSize absoluteContentBoxOffset() const;
// The content box converted to absolute coords (taking transforms into account).
FloatQuad absoluteContentQuad() const;
// This returns the content area of the box (excluding padding and border). The only difference with contentBoxRect is that computedCSSContentBoxRect
// does include the intrinsic padding in the content box as this is what some callers expect (like getComputedStyle).
LayoutRect computedCSSContentBoxRect() const { return LayoutRect(borderLeft() + computedCSSPaddingLeft(), borderTop() + computedCSSPaddingTop(), clientWidth() - computedCSSPaddingLeft() - computedCSSPaddingRight(), clientHeight() - computedCSSPaddingTop() - computedCSSPaddingBottom()); }
void addOutlineRects(Vector<LayoutRect>&, const LayoutPoint& additionalOffset, IncludeBlockVisualOverflowOrNot) const override;
// Use this with caution! No type checking is done!
LayoutBox* previousSiblingBox() const;
LayoutBox* previousInFlowSiblingBox() const;
LayoutBox* nextSiblingBox() const;
LayoutBox* nextInFlowSiblingBox() const;
LayoutBox* parentBox() const;
// Return the previous sibling column set or spanner placeholder. Only to be used on multicol container children.
LayoutBox* previousSiblingMultiColumnBox() const;
// Return the next sibling column set or spanner placeholder. Only to be used on multicol container children.
LayoutBox* nextSiblingMultiColumnBox() const;
bool canResize() const;
// Visual and layout overflow are in the coordinate space of the box. This means that they
// aren't purely physical directions. For horizontal-tb and vertical-lr they will match physical
// directions, but for vertical-rl, the left/right are flipped when compared to their physical
// counterparts. For example minX is on the left in vertical-lr, but it is on the right in
// vertical-rl.
LayoutRect noOverflowRect() const;
LayoutRect layoutOverflowRect() const { return m_overflow ? m_overflow->layoutOverflowRect() : noOverflowRect(); }
IntRect pixelSnappedLayoutOverflowRect() const { return pixelSnappedIntRect(layoutOverflowRect()); }
LayoutSize maxLayoutOverflow() const { return LayoutSize(layoutOverflowRect().maxX(), layoutOverflowRect().maxY()); }
LayoutUnit logicalLeftLayoutOverflow() const { return style()->isHorizontalWritingMode() ? layoutOverflowRect().x() : layoutOverflowRect().y(); }
LayoutUnit logicalRightLayoutOverflow() const { return style()->isHorizontalWritingMode() ? layoutOverflowRect().maxX() : layoutOverflowRect().maxY(); }
LayoutRect visualOverflowRect() const override { return m_overflow ? m_overflow->visualOverflowRect() : borderBoxRect(); }
LayoutUnit logicalLeftVisualOverflow() const { return style()->isHorizontalWritingMode() ? visualOverflowRect().x() : visualOverflowRect().y(); }
LayoutUnit logicalRightVisualOverflow() const { return style()->isHorizontalWritingMode() ? visualOverflowRect().maxX() : visualOverflowRect().maxY(); }
LayoutRect contentsVisualOverflowRect() const { return m_overflow ? m_overflow->contentsVisualOverflowRect() : LayoutRect(); }
void addLayoutOverflow(const LayoutRect&);
void addVisualOverflow(const LayoutRect&);
// Clipped by the contents clip, if one exists.
void addContentsVisualOverflow(const LayoutRect&);
void addVisualEffectOverflow();
LayoutRectOutsets computeVisualEffectOverflowOutsets() const;
void addOverflowFromChild(LayoutBox* child) { addOverflowFromChild(child, child->locationOffset()); }
void addOverflowFromChild(LayoutBox* child, const LayoutSize& delta);
void clearLayoutOverflow();
void clearAllOverflows() { m_overflow.clear(); }
void updateLayerTransformAfterLayout();
LayoutUnit contentWidth() const { return clientWidth() - paddingLeft() - paddingRight(); }
LayoutUnit contentHeight() const { return clientHeight() - paddingTop() - paddingBottom(); }
LayoutSize contentSize() const { return LayoutSize(contentWidth(), contentHeight()); }
LayoutUnit contentLogicalWidth() const { return style()->isHorizontalWritingMode() ? contentWidth() : contentHeight(); }
LayoutUnit contentLogicalHeight() const { return style()->isHorizontalWritingMode() ? contentHeight() : contentWidth(); }
// 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).
LayoutUnit offsetWidth() const override { return m_frameRect.width(); }
LayoutUnit offsetHeight() const override { return m_frameRect.height(); }
int pixelSnappedOffsetWidth() const final;
int pixelSnappedOffsetHeight() const final;
// More IE extensions. clientWidth and clientHeight represent the interior of an object
// excluding border and scrollbar. clientLeft/Top are just the borderLeftWidth and borderTopWidth.
LayoutUnit clientLeft() const { return LayoutUnit(borderLeft() + (shouldPlaceBlockDirectionScrollbarOnLogicalLeft() ? verticalScrollbarWidth() : 0)); }
LayoutUnit clientTop() const { return LayoutUnit(borderTop()); }
LayoutUnit clientWidth() const;
LayoutUnit clientHeight() const;
LayoutUnit clientLogicalWidth() const { return style()->isHorizontalWritingMode() ? clientWidth() : clientHeight(); }
LayoutUnit clientLogicalHeight() const { return style()->isHorizontalWritingMode() ? clientHeight() : clientWidth(); }
LayoutUnit clientLogicalBottom() const { return borderBefore() + clientLogicalHeight(); }
LayoutRect clientBoxRect() const { return LayoutRect(clientLeft(), clientTop(), clientWidth(), clientHeight()); }
int pixelSnappedClientWidth() const;
int pixelSnappedClientHeight() const;
// scrollWidth/scrollHeight will be the same as clientWidth/clientHeight unless the
// object has overflow:hidden/scroll/auto specified and also has overflow.
// scrollLeft/Top return the current scroll position. These methods are virtual so that objects like
// textareas can scroll shadow content (but pretend that they are the objects that are
// scrolling).
virtual LayoutUnit scrollLeft() const;
virtual LayoutUnit scrollTop() const;
virtual LayoutUnit scrollWidth() const;
virtual LayoutUnit scrollHeight() const;
int pixelSnappedScrollWidth() const;
int pixelSnappedScrollHeight() const;
virtual void setScrollLeft(LayoutUnit);
virtual void setScrollTop(LayoutUnit);
void scrollToOffset(const DoubleSize&, ScrollBehavior = ScrollBehaviorInstant);
void scrollByRecursively(const DoubleSize& delta, ScrollOffsetClamping = ScrollOffsetUnclamped);
// If makeVisibleInVisualViewport is set, the visual viewport will be scrolled
// if required to make the rect visible.
void scrollRectToVisible(const LayoutRect&, const ScrollAlignment& alignX, const ScrollAlignment& alignY, ScrollType = ProgrammaticScroll, bool makeVisibleInVisualViewport = true);
LayoutRectOutsets marginBoxOutsets() const override { return m_marginBoxOutsets; }
LayoutUnit marginTop() const override { return m_marginBoxOutsets.top(); }
LayoutUnit marginBottom() const override { return m_marginBoxOutsets.bottom(); }
LayoutUnit marginLeft() const override { return m_marginBoxOutsets.left(); }
LayoutUnit marginRight() const override { return m_marginBoxOutsets.right(); }
void setMarginTop(LayoutUnit margin) { m_marginBoxOutsets.setTop(margin); }
void setMarginBottom(LayoutUnit margin) { m_marginBoxOutsets.setBottom(margin); }
void setMarginLeft(LayoutUnit margin) { m_marginBoxOutsets.setLeft(margin); }
void setMarginRight(LayoutUnit margin) { m_marginBoxOutsets.setRight(margin); }
LayoutUnit marginLogicalLeft() const { return m_marginBoxOutsets.logicalLeft(style()->getWritingMode()); }
LayoutUnit marginLogicalRight() const { return m_marginBoxOutsets.logicalRight(style()->getWritingMode()); }
LayoutUnit marginBefore(const ComputedStyle* overrideStyle = nullptr) const final { return m_marginBoxOutsets.before((overrideStyle ? overrideStyle : style())->getWritingMode()); }
LayoutUnit marginAfter(const ComputedStyle* overrideStyle = nullptr) const final { return m_marginBoxOutsets.after((overrideStyle ? overrideStyle : style())->getWritingMode()); }
LayoutUnit marginStart(const ComputedStyle* overrideStyle = nullptr) const final
{
const ComputedStyle* styleToUse = overrideStyle ? overrideStyle : style();
return m_marginBoxOutsets.start(styleToUse->getWritingMode(), styleToUse->direction());
}
LayoutUnit marginEnd(const ComputedStyle* overrideStyle = nullptr) const final
{
const ComputedStyle* styleToUse = overrideStyle ? overrideStyle : style();
return m_marginBoxOutsets.end(styleToUse->getWritingMode(), styleToUse->direction());
}
LayoutUnit marginOver() const final { return m_marginBoxOutsets.over(style()->getWritingMode()); }
LayoutUnit marginUnder() const final { return m_marginBoxOutsets.under(style()->getWritingMode()); }
void setMarginBefore(LayoutUnit value, const ComputedStyle* overrideStyle = nullptr) { m_marginBoxOutsets.setBefore((overrideStyle ? overrideStyle : style())->getWritingMode(), value); }
void setMarginAfter(LayoutUnit value, const ComputedStyle* overrideStyle = nullptr) { m_marginBoxOutsets.setAfter((overrideStyle ? overrideStyle : style())->getWritingMode(), value); }
void setMarginStart(LayoutUnit value, const ComputedStyle* overrideStyle = nullptr)
{
const ComputedStyle* styleToUse = overrideStyle ? overrideStyle : style();
m_marginBoxOutsets.setStart(styleToUse->getWritingMode(), styleToUse->direction(), value);
}
void setMarginEnd(LayoutUnit value, const ComputedStyle* overrideStyle = nullptr)
{
const ComputedStyle* styleToUse = overrideStyle ? overrideStyle : style();
m_marginBoxOutsets.setEnd(styleToUse->getWritingMode(), styleToUse->direction(), value);
}
// The following functions are used to implement collapsing margins.
// All objects know their maximal positive and negative margins. The
// formula for computing a collapsed margin is |maxPosMargin| - |maxNegmargin|.
// For a non-collapsing box, such as a leaf element, this formula will simply return
// the margin of the element. Blocks override the maxMarginBefore and maxMarginAfter
// methods.
virtual bool isSelfCollapsingBlock() const { return false; }
virtual LayoutUnit collapsedMarginBefore() const { return marginBefore(); }
virtual LayoutUnit collapsedMarginAfter() const { return marginAfter(); }
LayoutRectOutsets collapsedMarginBoxLogicalOutsets() const
{
return LayoutRectOutsets(collapsedMarginBefore(), LayoutUnit(), collapsedMarginAfter(), LayoutUnit());
}
void absoluteRects(Vector<IntRect>&, const LayoutPoint& accumulatedOffset) const override;
void absoluteQuads(Vector<FloatQuad>&, bool* wasFixed) const override;
int reflectionOffset() const;
// Given a rect in the object's coordinate space, returns the corresponding rect in the reflection.
LayoutRect reflectedRect(const LayoutRect&) const;
void layout() override;
void paint(const PaintInfo&, const LayoutPoint&) const override;
bool nodeAtPoint(HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction) override;
LayoutUnit minPreferredLogicalWidth() const override;
LayoutUnit maxPreferredLogicalWidth() const override;
// FIXME: We should rename these back to overrideLogicalHeight/Width and have them store
// the border-box height/width like the regular height/width accessors on LayoutBox.
// Right now, these are different than contentHeight/contentWidth because they still
// include the scrollbar height/width.
LayoutUnit overrideLogicalContentWidth() const;
LayoutUnit overrideLogicalContentHeight() const;
bool hasOverrideLogicalContentHeight() const;
bool hasOverrideLogicalContentWidth() const;
void setOverrideLogicalContentHeight(LayoutUnit);
void setOverrideLogicalContentWidth(LayoutUnit);
void clearOverrideSize();
void clearOverrideLogicalContentHeight();
void clearOverrideLogicalContentWidth();
LayoutUnit overrideContainingBlockContentLogicalWidth() const;
LayoutUnit overrideContainingBlockContentLogicalHeight() const;
bool hasOverrideContainingBlockLogicalWidth() const;
bool hasOverrideContainingBlockLogicalHeight() const;
void setOverrideContainingBlockContentLogicalWidth(LayoutUnit);
void setOverrideContainingBlockContentLogicalHeight(LayoutUnit);
void clearContainingBlockOverrideSize();
void clearOverrideContainingBlockContentLogicalHeight();
LayoutUnit extraInlineOffset() const;
LayoutUnit extraBlockOffset() const;
void setExtraInlineOffset(LayoutUnit inlineOffest);
void setExtraBlockOffset(LayoutUnit blockOffest);
void clearExtraInlineAndBlockOffests();
LayoutSize offsetFromContainer(const LayoutObject*) const override;
LayoutUnit adjustBorderBoxLogicalWidthForBoxSizing(float width) const;
LayoutUnit adjustBorderBoxLogicalHeightForBoxSizing(float height) const;
LayoutUnit adjustContentBoxLogicalWidthForBoxSizing(float width) const;
LayoutUnit adjustContentBoxLogicalHeightForBoxSizing(float height) const;
// ComputedMarginValues holds the actual values for margins. It ignores
// margin collapsing as they are handled in LayoutBlockFlow.
// The margins are stored in logical coordinates (see COORDINATE
// SYSTEMS in LayoutBoxModel) for use during layout.
struct ComputedMarginValues {
DISALLOW_NEW();
ComputedMarginValues() { }
LayoutUnit m_before;
LayoutUnit m_after;
LayoutUnit m_start;
LayoutUnit m_end;
};
// LogicalExtentComputedValues is used both for the
// block-flow and inline-direction axis.
struct LogicalExtentComputedValues {
STACK_ALLOCATED();
LogicalExtentComputedValues() { }
// This is the dimension in the measured direction
// (logical height or logical width).
LayoutUnit m_extent;
// This is the offset in the measured direction
// (logical top or logical left).
LayoutUnit m_position;
// |m_margins| represents the margins in the measured direction.
// Note that ComputedMarginValues has also the margins in
// the orthogonal direction to have clearer names but they are
// ignored in the code.
ComputedMarginValues m_margins;
};
// Resolve auto margins in the chosen direction of the containing block so that objects can be pushed to the start, middle or end
// of the containing block.
void computeMarginsForDirection(MarginDirection forDirection, const LayoutBlock* containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd, Length marginStartLength, Length marginStartEnd) const;
// Used to resolve margins in the containing block's block-flow direction.
void computeAndSetBlockDirectionMargins(const LayoutBlock* containingBlock);
LayoutUnit offsetFromLogicalTopOfFirstPage() const;
// The page logical offset is the object's offset from the top of the page in the page progression
// direction (so an x-offset in vertical text and a y-offset for horizontal text).
LayoutUnit pageLogicalOffset() const { return m_rareData ? m_rareData->m_pageLogicalOffset : LayoutUnit(); }
void setPageLogicalOffset(LayoutUnit);
void positionLineBox(InlineBox*);
void moveWithEdgeOfInlineContainerIfNecessary(bool isHorizontal);
virtual InlineBox* createInlineBox();
void dirtyLineBoxes(bool fullLayout);
// For atomic inline elements, this function returns the inline box that contains us. Enables
// the atomic inline LayoutObject to quickly determine what line it is contained on and to easily
// iterate over structures on the line.
InlineBox* inlineBoxWrapper() const { return m_inlineBoxWrapper; }
void setInlineBoxWrapper(InlineBox*);
void deleteLineBoxWrapper();
void setSpannerPlaceholder(LayoutMultiColumnSpannerPlaceholder&);
void clearSpannerPlaceholder();
LayoutMultiColumnSpannerPlaceholder* spannerPlaceholder() const final { return m_rareData ? m_rareData->m_spannerPlaceholder : 0; }
// A pagination strut is the amount of space needed to push an in-flow block-level object (or
// float) to the logical top of the next page or column. It will be set both for forced breaks
// (e.g. page-break-before:always) and soft breaks (when there's not enough space in the current
// page / column for the object). The strut is baked into the logicalTop() of the object, so
// that logicalTop() - paginationStrut() == the original position in the previous column before
// deciding to break.
//
// Pagination struts are either set in front of a block-level box (here) or before a line
// (RootInlineBox::paginationStrut()).
LayoutUnit paginationStrut() const { return m_rareData ? m_rareData->m_paginationStrut : LayoutUnit(); }
void setPaginationStrut(LayoutUnit);
void resetPaginationStrut()
{
if (m_rareData)
m_rareData->m_paginationStrut = LayoutUnit();
}
// Is the specified break-before or break-after value supported on this object? It needs to be
// in-flow all the way up to a fragmentation context that supports the specified value.
bool isBreakBetweenControllable(EBreak) const;
// Is the specified break-inside value supported on this object? It needs to be contained by a
// fragmentation context that supports the specified value.
bool isBreakInsideControllable(EBreak) const;
EBreak breakAfter() const;
EBreak breakBefore() const;
EBreak breakInside() const;
static bool isForcedFragmentainerBreakValue(EBreak);
bool hasForcedBreakBefore() const;
bool hasForcedBreakAfter() const;
LayoutRect localOverflowRectForPaintInvalidation() const override;
bool mapToVisibleRectInAncestorSpace(const LayoutBoxModelObject* ancestor, LayoutRect&, VisibleRectFlags = DefaultVisibleRectFlags) const override;
virtual void invalidatePaintForOverhangingFloats(bool paintAllDescendants);
LayoutUnit containingBlockLogicalHeightForGetComputedStyle() const;
LayoutUnit containingBlockLogicalWidthForContent() const override;
LayoutUnit containingBlockLogicalHeightForContent(AvailableLogicalHeightType) const;
LayoutUnit containingBlockAvailableLineWidth() const;
LayoutUnit perpendicularContainingBlockLogicalHeight() const;
virtual void updateLogicalWidth();
void updateLogicalHeight();
virtual void computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues&) const;
// This function will compute the logical border-box height, without laying out the box. This means that the result
// is only "correct" when the height is explicitly specified. This function exists so that intrinsic width calculations
// have a way to deal with children that have orthogonal flows.
// When there is no explicit height, this function assumes a content height of zero (and returns just border+padding)
LayoutUnit computeLogicalHeightWithoutLayout() const;
void computeLogicalWidth(LogicalExtentComputedValues&) const;
bool stretchesToViewport() const { return document().inQuirksMode() && stretchesToViewportInQuirksMode(); }
virtual LayoutSize intrinsicSize() const { return LayoutSize(); }
LayoutUnit intrinsicLogicalWidth() const { return style()->isHorizontalWritingMode() ? intrinsicSize().width() : intrinsicSize().height(); }
LayoutUnit intrinsicLogicalHeight() const { return style()->isHorizontalWritingMode() ? intrinsicSize().height() : intrinsicSize().width(); }
virtual LayoutUnit intrinsicContentLogicalHeight() const { return m_intrinsicContentLogicalHeight; }
// Whether or not the element shrinks to its intrinsic width (rather than filling the width
// of a containing block). HTML4 buttons, <select>s, <input>s, legends, and floating/compact elements do this.
bool sizesLogicalWidthToFitContent(const Length& logicalWidth) const;
LayoutUnit shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const LayoutBlockFlow* cb) const;
LayoutUnit computeLogicalWidthUsing(SizeType, const Length& logicalWidth, LayoutUnit availableLogicalWidth, const LayoutBlock* containingBlock) const;
LayoutUnit computeLogicalHeightUsing(SizeType, const Length& height, LayoutUnit intrinsicContentHeight) const;
LayoutUnit computeContentLogicalHeight(SizeType, const Length& height, LayoutUnit intrinsicContentHeight) const;
LayoutUnit computeContentAndScrollbarLogicalHeightUsing(SizeType, const Length& height, LayoutUnit intrinsicContentHeight) const;
LayoutUnit computeReplacedLogicalWidthUsing(SizeType, const Length& width) const;
LayoutUnit computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit logicalWidth, ShouldComputePreferred = ComputeActual) const;
LayoutUnit computeReplacedLogicalHeightUsing(SizeType, const Length& height) const;
LayoutUnit computeReplacedLogicalHeightRespectingMinMaxHeight(LayoutUnit logicalHeight) const;
virtual LayoutUnit computeReplacedLogicalWidth(ShouldComputePreferred = ComputeActual) const;
virtual LayoutUnit computeReplacedLogicalHeight() const;
bool hasDefiniteLogicalWidth() const;
bool percentageLogicalHeightIsResolvable() const;
bool hasDefiniteLogicalHeight() const;
LayoutUnit computePercentageLogicalHeight(const Length& height) const;
// Block flows subclass availableWidth/Height to handle multi column layout (shrinking the width/height available to children when laying out.)
LayoutUnit availableLogicalWidth() const { return contentLogicalWidth(); }
LayoutUnit availableLogicalHeight(AvailableLogicalHeightType) const;
LayoutUnit availableLogicalHeightUsing(const Length&, AvailableLogicalHeightType) const;
// There are a few cases where we need to refer specifically to the available physical width and available physical height.
// Relative positioning is one of those cases, since left/top offsets are physical.
LayoutUnit availableWidth() const { return style()->isHorizontalWritingMode() ? availableLogicalWidth() : availableLogicalHeight(IncludeMarginBorderPadding); }
LayoutUnit availableHeight() const { return style()->isHorizontalWritingMode() ? availableLogicalHeight(IncludeMarginBorderPadding) : availableLogicalWidth(); }
int verticalScrollbarWidth() const;
int horizontalScrollbarHeight() const;
int intrinsicScrollbarLogicalWidth() const;
int scrollbarLogicalWidth() const { return style()->isHorizontalWritingMode() ? verticalScrollbarWidth() : horizontalScrollbarHeight(); }
int scrollbarLogicalHeight() const { return style()->isHorizontalWritingMode() ? horizontalScrollbarHeight() : verticalScrollbarWidth(); }
virtual ScrollResult scroll(ScrollGranularity, const FloatSize&);
bool canBeScrolledAndHasScrollableArea() const;
virtual bool canBeProgramaticallyScrolled() const;
virtual void autoscroll(const IntPoint&);
bool canAutoscroll() const;
IntSize calculateAutoscrollDirection(const IntPoint& pointInRootFrame) const;
static LayoutBox* findAutoscrollable(LayoutObject*);
virtual void stopAutoscroll() { }
virtual void panScroll(const IntPoint&);
bool hasAutoVerticalScrollbar() const { return hasOverflowClip() && (style()->overflowY() == OverflowAuto || style()->overflowY() == OverflowPagedY || style()->overflowY() == OverflowOverlay); }
bool hasAutoHorizontalScrollbar() const { return hasOverflowClip() && (style()->overflowX() == OverflowAuto || style()->overflowX() == OverflowOverlay); }
bool scrollsOverflow() const { return scrollsOverflowX() || scrollsOverflowY(); }
virtual bool shouldPlaceBlockDirectionScrollbarOnLogicalLeft() const { return style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft(); }
bool hasScrollableOverflowX() const { return scrollsOverflowX() && pixelSnappedScrollWidth() != pixelSnappedClientWidth(); }
bool hasScrollableOverflowY() const { return scrollsOverflowY() && pixelSnappedScrollHeight() != pixelSnappedClientHeight(); }
virtual bool scrollsOverflowX() const { return hasOverflowClip() && (style()->overflowX() == OverflowScroll || hasAutoHorizontalScrollbar()); }
virtual bool scrollsOverflowY() const { return hasOverflowClip() && (style()->overflowY() == OverflowScroll || hasAutoVerticalScrollbar()); }
// Elements such as the <input> field override this to specify that they are scrollable
// outside the context of the CSS overflow style
virtual bool isIntrinsicallyScrollable(ScrollbarOrientation orientation) const { return false; }
bool hasUnsplittableScrollingOverflow() const;
// Page / column breakability inside block-level objects.
enum PaginationBreakability {
AllowAnyBreaks, // No restrictions on breaking. May examine children to find possible break points.
ForbidBreaks, // Forbid breaks inside this object. Content cannot be split nicely into smaller pieces.
AvoidBreaks // Preferably avoid breaks. If not possible, examine children to find possible break points.
};
PaginationBreakability getPaginationBreakability() const;
LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = nullptr) override;
virtual LayoutRect overflowClipRect(const LayoutPoint& location, OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize) const;
LayoutRect clipRect(const LayoutPoint& location) const;
virtual bool hasControlClip() const { return false; }
virtual LayoutRect controlClipRect(const LayoutPoint&) const { return LayoutRect(); }
virtual void paintBoxDecorationBackground(const PaintInfo&, const LayoutPoint&) const;
virtual void paintMask(const PaintInfo&, const LayoutPoint&) const;
void imageChanged(WrappedImagePtr, const IntRect* = nullptr) override;
ResourcePriority computeResourcePriority() const final;
void logicalExtentAfterUpdatingLogicalWidth(const LayoutUnit& logicalTop, LogicalExtentComputedValues&);
PositionWithAffinity positionForPoint(const LayoutPoint&) override;
void removeFloatingOrPositionedChildFromBlockLists();
PaintLayer* enclosingFloatPaintingLayer() const;
virtual int firstLineBoxBaseline() const { return -1; }
virtual int inlineBlockBaseline(LineDirectionMode) const { return -1; } // Returns -1 if we should skip this box when computing the baseline of an inline-block.
bool shrinkToAvoidFloats() const;
virtual bool avoidsFloats() const;
virtual void markForPaginationRelayoutIfNeeded(SubtreeLayoutScope&);
bool isWritingModeRoot() const { return !parent() || parent()->style()->getWritingMode() != style()->getWritingMode(); }
bool isOrthogonalWritingModeRoot() const { return parent() && parent()->isHorizontalWritingMode() != isHorizontalWritingMode(); }
void markOrthogonalWritingModeRoot();
void unmarkOrthogonalWritingModeRoot();
bool isDeprecatedFlexItem() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isDeprecatedFlexibleBox(); }
bool isFlexItemIncludingDeprecated() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isFlexibleBoxIncludingDeprecated(); }
bool isFlexItem() const { return !isInline() && !isFloatingOrOutOfFlowPositioned() && parent() && parent()->isFlexibleBox(); }
bool isGridItem() const { return parent() && parent()->isLayoutGrid(); }
LayoutUnit lineHeight(bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
int baselinePosition(FontBaseline, bool firstLine, LineDirectionMode, LinePositionMode = PositionOnContainingLine) const override;
LayoutUnit offsetLeft() const override;
LayoutUnit offsetTop() const override;
LayoutPoint flipForWritingModeForChild(const LayoutBox* child, const LayoutPoint&) const;
LayoutUnit flipForWritingMode(LayoutUnit position) const WARN_UNUSED_RETURN {
// The offset is in the block direction (y for horizontal writing modes, x for vertical writing modes).
if (!UNLIKELY(hasFlippedBlocksWritingMode()))
return position;
return logicalHeight() - position;
}
LayoutPoint flipForWritingMode(const LayoutPoint& position) const WARN_UNUSED_RETURN {
if (!UNLIKELY(hasFlippedBlocksWritingMode()))
return position;
return isHorizontalWritingMode() ? LayoutPoint(position.x(), m_frameRect.height() - position.y()) : LayoutPoint(m_frameRect.width() - position.x(), position.y());
}
LayoutSize flipForWritingMode(const LayoutSize& offset) const WARN_UNUSED_RETURN {
if (!UNLIKELY(hasFlippedBlocksWritingMode()))
return offset;
return isHorizontalWritingMode() ? LayoutSize(offset.width(), m_frameRect.height() - offset.height()) : LayoutSize(m_frameRect.width() - offset.width(), offset.height());
}
void flipForWritingMode(LayoutRect& rect) const
{
if (!UNLIKELY(hasFlippedBlocksWritingMode()))
return;
if (isHorizontalWritingMode())
rect.setY(m_frameRect.height() - rect.maxY());
else
rect.setX(m_frameRect.width() - rect.maxX());
}
FloatPoint flipForWritingMode(const FloatPoint& position) const WARN_UNUSED_RETURN {
if (!UNLIKELY(hasFlippedBlocksWritingMode()))
return position;
return isHorizontalWritingMode() ? FloatPoint(position.x(), m_frameRect.height() - position.y()) : FloatPoint(m_frameRect.width() - position.x(), position.y());
}
void flipForWritingMode(FloatRect& rect) const
{
if (!UNLIKELY(hasFlippedBlocksWritingMode()))
return;
if (isHorizontalWritingMode())
rect.setY(m_frameRect.height() - rect.maxY());
else
rect.setX(m_frameRect.width() - rect.maxX());
}
// These represent your location relative to your container as a physical offset.
// In layout related methods you almost always want the logical location (e.g. x() and y()).
LayoutPoint topLeftLocation() const;
LayoutSize topLeftLocationOffset() const { return toLayoutSize(topLeftLocation()); }
LayoutRect logicalVisualOverflowRectForPropagation(const ComputedStyle&) const;
LayoutRect visualOverflowRectForPropagation(const ComputedStyle&) const;
LayoutRect logicalLayoutOverflowRectForPropagation(const ComputedStyle&) const;
LayoutRect layoutOverflowRectForPropagation(const ComputedStyle&) const;
bool hasOverflowModel() const { return m_overflow; }
bool hasVisualOverflow() const { return m_overflow && !borderBoxRect().contains(m_overflow->visualOverflowRect()); }
virtual bool needsPreferredWidthsRecalculation() const;
IntSize scrolledContentOffset() const;
void mapScrollingContentsRectToBoxSpace(LayoutRect&) const;
// Returns true if the rect actually intersects the clipping region.
// If edgeInclusive is true, then this method may return true even
// if the resulting rect has zero area.
bool applyOverflowClip(LayoutRect&, VisibleRectFlags = DefaultVisibleRectFlags) const;
virtual bool hasRelativeLogicalWidth() const;
virtual bool hasRelativeLogicalHeight() const;
bool hasHorizontalLayoutOverflow() const
{
if (!m_overflow)
return false;
LayoutRect layoutOverflowRect = m_overflow->layoutOverflowRect();
LayoutRect noOverflowRect = this->noOverflowRect();
return layoutOverflowRect.x() < noOverflowRect.x() || layoutOverflowRect.maxX() > noOverflowRect.maxX();
}
bool hasVerticalLayoutOverflow() const
{
if (!m_overflow)
return false;
LayoutRect layoutOverflowRect = m_overflow->layoutOverflowRect();
LayoutRect noOverflowRect = this->noOverflowRect();
return layoutOverflowRect.y() < noOverflowRect.y() || layoutOverflowRect.maxY() > noOverflowRect.maxY();
}
virtual LayoutBox* createAnonymousBoxWithSameTypeAs(const LayoutObject*) const
{
ASSERT_NOT_REACHED();
return nullptr;
}
bool hasSameDirectionAs(const LayoutBox* object) const { return style()->direction() == object->style()->direction(); }
ShapeOutsideInfo* shapeOutsideInfo() const;
void markShapeOutsideDependentsForLayout()
{
if (isFloating())
removeFloatingOrPositionedChildFromBlockLists();
}
void setIntrinsicContentLogicalHeight(LayoutUnit intrinsicContentLogicalHeight) const { m_intrinsicContentLogicalHeight = intrinsicContentLogicalHeight; }
bool canRenderBorderImage() const;
void mapLocalToAncestor(const LayoutBoxModelObject* ancestor, TransformState&, MapCoordinatesFlags = ApplyContainerFlip, bool* wasFixed = nullptr) const override;
void mapAncestorToLocal(const LayoutBoxModelObject*, TransformState&, MapCoordinatesFlags) const override;
void clearPreviousPaintInvalidationRects() override;
LayoutBlock* percentHeightContainer() const { return m_rareData ? m_rareData->m_percentHeightContainer : nullptr; }
void setPercentHeightContainer(LayoutBlock*);
void removeFromPercentHeightContainer();
void clearPercentHeightDescendants();
protected:
void willBeDestroyed() override;
void insertedIntoTree() override;
void willBeRemovedFromTree() override;
void styleWillChange(StyleDifference, const ComputedStyle& newStyle) override;
void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
void updateFromStyle() override;
// Returns false if it could not cheaply compute the extent (e.g. fixed background), in which case the returned rect may be incorrect.
// FIXME: make this a const method once the LayoutBox reference in BoxPainter is const.
bool getBackgroundPaintedExtent(LayoutRect&) const;
virtual bool foregroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect, unsigned maxDepthToTest) const;
bool computeBackgroundIsKnownToBeObscured() const override;
virtual void computePositionedLogicalWidth(LogicalExtentComputedValues&) const;
LayoutUnit computeIntrinsicLogicalWidthUsing(const Length& logicalWidthLength, LayoutUnit availableLogicalWidth, LayoutUnit borderAndPadding) const;
virtual LayoutUnit computeIntrinsicLogicalContentHeightUsing(const Length& logicalHeightLength, LayoutUnit intrinsicContentHeight, LayoutUnit borderAndPadding) const;
virtual bool shouldComputeSizeAsReplaced() const { return isAtomicInlineLevel() && !isInlineBlockOrInlineTable(); }
LayoutObject* splitAnonymousBoxesAroundChild(LayoutObject* beforeChild);
void addLayerHitTestRects(LayerHitTestRects&, const PaintLayer* currentCompositedLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const override;
void computeSelfHitTestRects(Vector<LayoutRect>&, const LayoutPoint& layerOffset) const override;
bool hitTestClippedOutByRoundedBorder(const HitTestLocation& locationInContainer, const LayoutPoint& borderBoxLocation) const;
PaintInvalidationReason getPaintInvalidationReason(const LayoutBoxModelObject& paintInvalidationContainer,
const LayoutRect& oldBounds, const LayoutPoint& oldPositionFromPaintInvalidationContainer,
const LayoutRect& newBounds, const LayoutPoint& newPositionFromPaintInvalidationContainer) const override;
void incrementallyInvalidatePaint(const LayoutBoxModelObject& paintInvalidationContainer, const LayoutRect& oldBounds, const LayoutRect& newBounds, const LayoutPoint& positionFromPaintInvalidationContainer) override;
PaintInvalidationReason invalidatePaintIfNeeded(const PaintInvalidationState&) override;
void invalidatePaintOfSubtreesIfNeeded(const PaintInvalidationState& childPaintInvalidationState) override;
bool hasStretchedLogicalWidth() const;
bool hasNonCompositedScrollbars() const final;
void excludeScrollbars(LayoutRect&, OverlayScrollbarSizeRelevancy = IgnoreOverlayScrollbarSize) const;
LayoutUnit containingBlockLogicalWidthForPositioned(const LayoutBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode = true) const;
LayoutUnit containingBlockLogicalHeightForPositioned(const LayoutBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode = true) const;
static void computeBlockStaticDistance(Length& logicalTop, Length& logicalBottom, const LayoutBox* child, const LayoutBoxModelObject* containerBlock);
static void computeInlineStaticDistance(Length& logicalLeft, Length& logicalRight, const LayoutBox* child, const LayoutBoxModelObject* containerBlock, LayoutUnit containerLogicalWidth);
static void computeLogicalLeftPositionedOffset(LayoutUnit& logicalLeftPos, const LayoutBox* child, LayoutUnit logicalWidthValue, const LayoutBoxModelObject* containerBlock, LayoutUnit containerLogicalWidth);
static void computeLogicalTopPositionedOffset(LayoutUnit& logicalTopPos, const LayoutBox* child, LayoutUnit logicalHeightValue, const LayoutBoxModelObject* containerBlock, LayoutUnit containerLogicalHeight);
private:
bool mustInvalidateBackgroundOrBorderPaintOnHeightChange() const;
bool mustInvalidateBackgroundOrBorderPaintOnWidthChange() const;
inline bool mustInvalidateFillLayersPaintOnWidthChange(const FillLayer&) const;
void invalidatePaintRectClippedByOldAndNewBounds(const LayoutBoxModelObject& paintInvalidationContainer, const LayoutRect&, const LayoutRect& oldBounds, const LayoutRect& newBounds);
void updateShapeOutsideInfoAfterStyleChange(const ComputedStyle&, const ComputedStyle* oldStyle);
void updateGridPositionAfterStyleChange(const ComputedStyle*);
bool autoWidthShouldFitContent() const;
LayoutUnit shrinkToFitLogicalWidth(LayoutUnit availableLogicalWidth, LayoutUnit bordersPlusPadding) const;
// Returns true if we queued up a paint invalidation.
bool invalidatePaintOfLayerRectsForImage(WrappedImagePtr, const FillLayer&, bool drawingBackground);
bool stretchesToViewportInQuirksMode() const;
bool skipContainingBlockForPercentHeightCalculation(const LayoutBox* containingBlock) const;
virtual void computePositionedLogicalHeight(LogicalExtentComputedValues&) const;
void computePositionedLogicalWidthUsing(SizeType, Length logicalWidth, const LayoutBoxModelObject* containerBlock, TextDirection containerDirection,
LayoutUnit containerLogicalWidth, LayoutUnit bordersPlusPadding,
const Length& logicalLeft, const Length& logicalRight, const Length& marginLogicalLeft,
const Length& marginLogicalRight, LogicalExtentComputedValues&) const;
void computePositionedLogicalHeightUsing(SizeType, Length logicalHeightLength, const LayoutBoxModelObject* containerBlock,
LayoutUnit containerLogicalHeight, LayoutUnit bordersPlusPadding, LayoutUnit logicalHeight,
const Length& logicalTop, const Length& logicalBottom, const Length& marginLogicalTop,
const Length& marginLogicalBottom, LogicalExtentComputedValues&) const;
LayoutUnit fillAvailableMeasure(LayoutUnit availableLogicalWidth) const;
LayoutUnit fillAvailableMeasure(LayoutUnit availableLogicalWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const;
virtual void computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const;
// This function calculates the preferred widths for an object.
//
// This function is only expected to be called if
// the boolean preferredLogicalWidthsDirty is true. It also MUST clear the
// boolean before returning.
//
// See INTRINSIC SIZES / PREFERRED LOGICAL WIDTHS in LayoutObject.h for more
// details about those widths.
virtual void computePreferredLogicalWidths() { clearPreferredLogicalWidthsDirty(); }
LayoutBoxRareData& ensureRareData()
{
if (!m_rareData)
m_rareData = adoptPtr(new LayoutBoxRareData());
return *m_rareData.get();
}
bool needToSavePreviousBoxSizes();
void savePreviousBoxSizesIfNeeded();
LayoutSize computePreviousBorderBoxSize(const LayoutSize& previousBoundsSize) const;
bool logicalHeightComputesAsNone(SizeType) const;
bool isBox() const = delete; // This will catch anyone doing an unnecessary check.
void frameRectChanged()
{
// The frame rect may change because of layout of other objects.
// Should check this object for paint invalidation.
if (!needsLayout())
setMayNeedPaintInvalidation();
}
// Returns true if the box intersects the viewport visible to the user.
bool intersectsVisibleViewport();
bool hitTestChildren(HitTestResult&, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction);
void updateBackgroundAttachmentFixedStatusAfterStyleChange();
// The CSS border box rect for this box.
//
// The rectangle is in this box's physical coordinates but with a
// flipped block-flow direction (see the COORDINATE SYSTEMS section
// in LayoutBoxModelObject). The location is the distance from this
// object's border edge to the container's border edge (which is not
// always the parent). Thus it includes any logical top/left along
// with this box's margins.
LayoutRect m_frameRect;
// Our intrinsic height, used for min-height: min-content etc. Maintained by
// updateLogicalHeight. This is logicalHeight() before it is clamped to
// min/max.
mutable LayoutUnit m_intrinsicContentLogicalHeight;
void inflatePaintInvalidationRectForReflectionAndFilter(LayoutRect&) const;
LayoutRectOutsets m_marginBoxOutsets;
protected:
// The logical width of the element if it were to break its lines at every
// possible opportunity.
//
// See LayoutObject::minPreferredLogicalWidth() for more details.
LayoutUnit m_minPreferredLogicalWidth;
// The logical width of the element if it never breaks any lines at all.
//
// See LayoutObject::maxPreferredLogicalWidth() for more details.
LayoutUnit m_maxPreferredLogicalWidth;
// Our overflow information.
OwnPtr<OverflowModel> m_overflow;
private:
// The inline box containing this LayoutBox, for atomic inline elements.
InlineBox* m_inlineBoxWrapper;
OwnPtr<LayoutBoxRareData> m_rareData;
};
DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBox, isBox());
inline LayoutBox* LayoutBox::previousSiblingBox() const
{
return toLayoutBox(previousSibling());
}
inline LayoutBox* LayoutBox::previousInFlowSiblingBox() const
{
LayoutBox* previous = previousSiblingBox();
while (previous && previous->isOutOfFlowPositioned())
previous = previous->previousSiblingBox();
return previous;
}
inline LayoutBox* LayoutBox::nextSiblingBox() const
{
return toLayoutBox(nextSibling());
}
inline LayoutBox* LayoutBox::nextInFlowSiblingBox() const
{
LayoutBox* next = nextSiblingBox();
while (next && next->isOutOfFlowPositioned())
next = next->nextSiblingBox();
return next;
}
inline LayoutBox* LayoutBox::parentBox() const
{
return toLayoutBox(parent());
}
inline LayoutBox* LayoutBox::firstChildBox() const
{
return toLayoutBox(slowFirstChild());
}
inline LayoutBox* LayoutBox::lastChildBox() const
{
return toLayoutBox(slowLastChild());
}
inline LayoutBox* LayoutBox::previousSiblingMultiColumnBox() const
{
ASSERT(isLayoutMultiColumnSpannerPlaceholder() || isLayoutMultiColumnSet());
LayoutBox* previousBox = previousSiblingBox();
if (previousBox->isLayoutFlowThread())
return nullptr;
return previousBox;
}
inline LayoutBox* LayoutBox::nextSiblingMultiColumnBox() const
{
ASSERT(isLayoutMultiColumnSpannerPlaceholder() || isLayoutMultiColumnSet());
return nextSiblingBox();
}
inline void LayoutBox::setInlineBoxWrapper(InlineBox* boxWrapper)
{
if (boxWrapper) {
ASSERT(!m_inlineBoxWrapper);
// m_inlineBoxWrapper should already be nullptr. Deleting it is a safeguard against security issues.
// Otherwise, there will two line box wrappers keeping the reference to this layoutObject, and
// only one will be notified when the layoutObject is getting destroyed. The second line box wrapper
// will keep a stale reference.
if (UNLIKELY(m_inlineBoxWrapper != nullptr))
deleteLineBoxWrapper();
}
m_inlineBoxWrapper = boxWrapper;
}
inline bool LayoutBox::isForcedFragmentainerBreakValue(EBreak breakValue)
{
return breakValue == BreakColumn
|| breakValue == BreakLeft
|| breakValue == BreakPage
|| breakValue == BreakRecto
|| breakValue == BreakRight
|| breakValue == BreakVerso;
}
} // namespace blink
#endif // LayoutBox_h
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