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webkit / WebKit / 1c4ff657af9e53d157a5944da862c3cb4c61a72e / . / Source / WebCore / rendering / RenderBox.cpp
blob: d018ed472a21dc850ba66485eace124c3b19a239 [file] [log] [blame]
/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
* (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2005-2010, 2015 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.
*
*/
#include "config.h"
#include "RenderBox.h"
#include "Chrome.h"
#include "ChromeClient.h"
#include "Document.h"
#include "EventHandler.h"
#include "FloatQuad.h"
#include "FloatRoundedRect.h"
#include "Frame.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "HTMLBodyElement.h"
#include "HTMLButtonElement.h"
#include "HTMLElement.h"
#include "HTMLFrameOwnerElement.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "HTMLTextAreaElement.h"
#include "HitTestResult.h"
#include "InlineElementBox.h"
#include "Page.h"
#include "PaintInfo.h"
#include "RenderBoxRegionInfo.h"
#include "RenderDeprecatedFlexibleBox.h"
#include "RenderFlexibleBox.h"
#include "RenderGeometryMap.h"
#include "RenderInline.h"
#include "RenderIterator.h"
#include "RenderLayer.h"
#include "RenderLayerBacking.h"
#include "RenderLayerCompositor.h"
#include "RenderNamedFlowFragment.h"
#include "RenderNamedFlowThread.h"
#include "RenderTableCell.h"
#include "RenderTheme.h"
#include "RenderView.h"
#include "ScrollAnimator.h"
#include "ScrollbarTheme.h"
#include "TransformState.h"
#include "htmlediting.h"
#include <algorithm>
#include <math.h>
#include <wtf/StackStats.h>
#if PLATFORM(IOS)
#include "Settings.h"
#endif
namespace WebCore {
struct SameSizeAsRenderBox : public RenderBoxModelObject {
virtual ~SameSizeAsRenderBox() { }
LayoutRect frameRect;
LayoutBoxExtent marginBox;
LayoutUnit preferredLogicalWidths[2];
void* pointers[2];
};
COMPILE_ASSERT(sizeof(RenderBox) == sizeof(SameSizeAsRenderBox), RenderBox_should_stay_small);
using namespace HTMLNames;
// Used by flexible boxes when flexing this element and by table cells.
typedef WTF::HashMap<const RenderBox*, LayoutUnit> OverrideSizeMap;
static OverrideSizeMap* gOverrideHeightMap = nullptr;
static OverrideSizeMap* gOverrideWidthMap = nullptr;
#if ENABLE(CSS_GRID_LAYOUT)
// Used by grid elements to properly size their grid items.
static OverrideSizeMap* gOverrideContainingBlockLogicalHeightMap = nullptr;
static OverrideSizeMap* gOverrideContainingBlockLogicalWidthMap = nullptr;
#endif
// Size of border belt for autoscroll. When mouse pointer in border belt,
// autoscroll is started.
static const int autoscrollBeltSize = 20;
static const unsigned backgroundObscurationTestMaxDepth = 4;
bool RenderBox::s_hadOverflowClip = false;
static bool skipBodyBackground(const RenderBox* bodyElementRenderer)
{
ASSERT(bodyElementRenderer->isBody());
// The <body> only paints its background if the root element has defined a background independent of the body,
// or if the <body>'s parent is not the document element's renderer (e.g. inside SVG foreignObject).
auto documentElementRenderer = bodyElementRenderer->document().documentElement()->renderer();
if (!documentElementRenderer)
return false;
if (documentElementRenderer->hasBackground())
return false;
if (documentElementRenderer != bodyElementRenderer->parent())
return false;
if (bodyElementRenderer->isComposited() && documentElementRenderer->isComposited())
return downcast<RenderLayerModelObject>(documentElementRenderer)->layer()->backing()->graphicsLayer()->drawsContent();
return true;
}
RenderBox::RenderBox(Element& element, Ref<RenderStyle>&& style, unsigned baseTypeFlags)
: RenderBoxModelObject(element, WTF::move(style), baseTypeFlags)
, m_minPreferredLogicalWidth(-1)
, m_maxPreferredLogicalWidth(-1)
, m_inlineBoxWrapper(nullptr)
{
setIsBox();
}
RenderBox::RenderBox(Document& document, Ref<RenderStyle>&& style, unsigned baseTypeFlags)
: RenderBoxModelObject(document, WTF::move(style), baseTypeFlags)
, m_minPreferredLogicalWidth(-1)
, m_maxPreferredLogicalWidth(-1)
, m_inlineBoxWrapper(nullptr)
{
setIsBox();
}
RenderBox::~RenderBox()
{
if (frame().eventHandler().autoscrollRenderer() == this)
frame().eventHandler().stopAutoscrollTimer(true);
clearOverrideSize();
#if ENABLE(CSS_GRID_LAYOUT)
clearContainingBlockOverrideSize();
#endif
RenderBlock::removePercentHeightDescendantIfNeeded(*this);
#if ENABLE(CSS_SHAPES)
ShapeOutsideInfo::removeInfo(*this);
#endif
view().unscheduleLazyRepaint(*this);
if (hasControlStatesForRenderer(this))
removeControlStatesForRenderer(this);
}
RenderRegion* RenderBox::clampToStartAndEndRegions(RenderRegion* region) const
{
RenderFlowThread* flowThread = flowThreadContainingBlock();
ASSERT(isRenderView() || (region && flowThread));
if (isRenderView())
return region;
// We need to clamp to the block, since we want any lines or blocks that overflow out of the
// logical top or logical bottom of the block to size as though the border box in the first and
// last regions extended infinitely. Otherwise the lines are going to size according to the regions
// they overflow into, which makes no sense when this block doesn't exist in |region| at all.
RenderRegion* startRegion = nullptr;
RenderRegion* endRegion = nullptr;
if (!flowThread->getRegionRangeForBox(this, startRegion, endRegion))
return region;
if (region->logicalTopForFlowThreadContent() < startRegion->logicalTopForFlowThreadContent())
return startRegion;
if (region->logicalTopForFlowThreadContent() > endRegion->logicalTopForFlowThreadContent())
return endRegion;
return region;
}
bool RenderBox::hasRegionRangeInFlowThread() const
{
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!flowThread || !flowThread->hasValidRegionInfo())
return false;
return flowThread->hasCachedRegionRangeForBox(this);
}
LayoutRect RenderBox::clientBoxRectInRegion(RenderRegion* region) const
{
if (!region)
return clientBoxRect();
LayoutRect clientBox = borderBoxRectInRegion(region);
clientBox.setLocation(clientBox.location() + LayoutSize(borderLeft(), borderTop()));
clientBox.setSize(clientBox.size() - LayoutSize(borderLeft() + borderRight() + verticalScrollbarWidth(), borderTop() + borderBottom() + horizontalScrollbarHeight()));
return clientBox;
}
LayoutRect RenderBox::borderBoxRectInRegion(RenderRegion* region, RenderBoxRegionInfoFlags cacheFlag) const
{
if (!region)
return borderBoxRect();
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!flowThread)
return borderBoxRect();
RenderRegion* startRegion = nullptr;
RenderRegion* endRegion = nullptr;
if (!flowThread->getRegionRangeForBox(this, startRegion, endRegion)) {
// FIXME: In a perfect world this condition should never happen.
return borderBoxRect();
}
ASSERT(flowThread->regionInRange(region, startRegion, endRegion));
// Compute the logical width and placement in this region.
RenderBoxRegionInfo* boxInfo = renderBoxRegionInfo(region, cacheFlag);
if (!boxInfo)
return borderBoxRect();
// We have cached insets.
LayoutUnit logicalWidth = boxInfo->logicalWidth();
LayoutUnit logicalLeft = boxInfo->logicalLeft();
// Now apply the parent inset since it is cumulative whenever anything in the containing block chain shifts.
// FIXME: Doesn't work right with perpendicular writing modes.
const RenderBlock* currentBox = containingBlock();
RenderBoxRegionInfo* currentBoxInfo = isRenderFlowThread() ? nullptr : currentBox->renderBoxRegionInfo(region);
while (currentBoxInfo && currentBoxInfo->isShifted()) {
if (currentBox->style().direction() == LTR)
logicalLeft += currentBoxInfo->logicalLeft();
else
logicalLeft -= (currentBox->logicalWidth() - currentBoxInfo->logicalWidth()) - currentBoxInfo->logicalLeft();
// Once we reach the fragmentation container we should stop.
if (currentBox->isRenderFlowThread())
break;
currentBox = currentBox->containingBlock();
region = currentBox->clampToStartAndEndRegions(region);
currentBoxInfo = currentBox->renderBoxRegionInfo(region);
}
if (cacheFlag == DoNotCacheRenderBoxRegionInfo)
delete boxInfo;
if (isHorizontalWritingMode())
return LayoutRect(logicalLeft, 0, logicalWidth, height());
return LayoutRect(0, logicalLeft, width(), logicalWidth);
}
static RenderBlockFlow* outermostBlockContainingFloatingObject(RenderBox& box)
{
ASSERT(box.isFloating());
RenderBlockFlow* parentBlock = nullptr;
for (auto& ancestor : ancestorsOfType<RenderBlockFlow>(box)) {
if (ancestor.isRenderView())
break;
if (!parentBlock || ancestor.containsFloat(box))
parentBlock = &ancestor;
}
return parentBlock;
}
void RenderBox::removeFloatingOrPositionedChildFromBlockLists()
{
ASSERT(isFloatingOrOutOfFlowPositioned());
if (documentBeingDestroyed())
return;
if (isFloating()) {
if (RenderBlockFlow* parentBlock = outermostBlockContainingFloatingObject(*this)) {
parentBlock->markSiblingsWithFloatsForLayout(this);
parentBlock->markAllDescendantsWithFloatsForLayout(this, false);
}
}
if (isOutOfFlowPositioned())
RenderBlock::removePositionedObject(*this);
}
void RenderBox::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
{
s_hadOverflowClip = hasOverflowClip();
const RenderStyle* oldStyle = hasInitializedStyle() ? &style() : nullptr;
if (oldStyle) {
// The background of the root element or the body element could propagate up to
// the canvas. Issue full repaint, when our style changes substantially.
if (diff >= StyleDifferenceRepaint && (isRoot() || isBody())) {
view().repaintRootContents();
if (oldStyle->hasEntirelyFixedBackground() != newStyle.hasEntirelyFixedBackground())
view().compositor().rootFixedBackgroundsChanged();
}
// When a layout hint happens and an object's position style changes, we have to do a layout
// to dirty the render tree using the old position value now.
if (diff == StyleDifferenceLayout && parent() && oldStyle->position() != newStyle.position()) {
markContainingBlocksForLayout();
if (oldStyle->position() == StaticPosition)
repaint();
else if (newStyle.hasOutOfFlowPosition())
parent()->setChildNeedsLayout();
if (isFloating() && !isOutOfFlowPositioned() && newStyle.hasOutOfFlowPosition())
removeFloatingOrPositionedChildFromBlockLists();
}
} else if (isBody())
view().repaintRootContents();
RenderBoxModelObject::styleWillChange(diff, newStyle);
}
void RenderBox::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
// Horizontal writing mode definition is updated in RenderBoxModelObject::updateFromStyle,
// (as part of the RenderBoxModelObject::styleDidChange call below). So, we can safely cache the horizontal
// writing mode value before style change here.
bool oldHorizontalWritingMode = isHorizontalWritingMode();
RenderBoxModelObject::styleDidChange(diff, oldStyle);
const RenderStyle& newStyle = style();
if (needsLayout() && oldStyle) {
RenderBlock::removePercentHeightDescendantIfNeeded(*this);
// Normally we can do optimized positioning layout for absolute/fixed positioned objects. There is one special case, however, which is
// when the positioned object's margin-before is changed. In this case the parent has to get a layout in order to run margin collapsing
// to determine the new static position.
if (isOutOfFlowPositioned() && newStyle.hasStaticBlockPosition(isHorizontalWritingMode()) && oldStyle->marginBefore() != newStyle.marginBefore()
&& parent() && !parent()->normalChildNeedsLayout())
parent()->setChildNeedsLayout();
}
if (RenderBlock::hasPercentHeightContainerMap() && firstChild()
&& oldHorizontalWritingMode != isHorizontalWritingMode())
RenderBlock::clearPercentHeightDescendantsFrom(*this);
// If our zoom factor changes and we have a defined scrollLeft/Top, we need to adjust that value into the
// new zoomed coordinate space.
if (hasOverflowClip() && oldStyle && oldStyle->effectiveZoom() != newStyle.effectiveZoom()) {
if (int left = layer()->scrollXOffset()) {
left = (left / oldStyle->effectiveZoom()) * newStyle.effectiveZoom();
layer()->scrollToXOffset(left);
}
if (int top = layer()->scrollYOffset()) {
top = (top / oldStyle->effectiveZoom()) * newStyle.effectiveZoom();
layer()->scrollToYOffset(top);
}
}
// Our opaqueness might have changed without triggering layout.
if (diff >= StyleDifferenceRepaint && diff <= StyleDifferenceRepaintLayer) {
auto parentToInvalidate = parent();
for (unsigned i = 0; i < backgroundObscurationTestMaxDepth && parentToInvalidate; ++i) {
parentToInvalidate->invalidateBackgroundObscurationStatus();
parentToInvalidate = parentToInvalidate->parent();
}
}
bool isBodyRenderer = isBody();
bool isRootRenderer = isRoot();
// Set the text color if we're the body.
if (isBodyRenderer)
document().setTextColor(newStyle.visitedDependentColor(CSSPropertyColor));
if (isRootRenderer || isBodyRenderer) {
// Propagate the new writing mode and direction up to the RenderView.
RenderStyle& viewStyle = view().style();
bool viewChangedWritingMode = false;
bool rootStyleChanged = false;
bool viewStyleChanged = false;
RenderObject* rootRenderer = isBodyRenderer ? document().documentElement()->renderer() : nullptr;
if (viewStyle.direction() != newStyle.direction() && (isRootRenderer || !document().directionSetOnDocumentElement())) {
viewStyle.setDirection(newStyle.direction());
viewStyleChanged = true;
if (isBodyRenderer) {
rootRenderer->style().setDirection(newStyle.direction());
rootStyleChanged = true;
}
setNeedsLayoutAndPrefWidthsRecalc();
}
if (viewStyle.writingMode() != newStyle.writingMode() && (isRootRenderer || !document().writingModeSetOnDocumentElement())) {
viewStyle.setWritingMode(newStyle.writingMode());
viewChangedWritingMode = true;
viewStyleChanged = true;
view().setHorizontalWritingMode(newStyle.isHorizontalWritingMode());
view().markAllDescendantsWithFloatsForLayout();
if (isBodyRenderer) {
rootStyleChanged = true;
rootRenderer->style().setWritingMode(newStyle.writingMode());
rootRenderer->setHorizontalWritingMode(newStyle.isHorizontalWritingMode());
}
setNeedsLayoutAndPrefWidthsRecalc();
}
view().frameView().recalculateScrollbarOverlayStyle();
const Pagination& pagination = view().frameView().pagination();
if (viewChangedWritingMode && pagination.mode != Pagination::Unpaginated) {
viewStyle.setColumnStylesFromPaginationMode(pagination.mode);
if (view().multiColumnFlowThread())
view().updateColumnProgressionFromStyle(viewStyle);
}
if (viewStyleChanged && view().multiColumnFlowThread())
view().updateStylesForColumnChildren();
if (rootStyleChanged && is<RenderBlockFlow>(rootRenderer) && downcast<RenderBlockFlow>(*rootRenderer).multiColumnFlowThread())
downcast<RenderBlockFlow>(*rootRenderer).updateStylesForColumnChildren();
if (diff != StyleDifferenceEqual)
view().compositor().rootOrBodyStyleChanged(*this, oldStyle);
}
#if ENABLE(CSS_SHAPES)
if ((oldStyle && oldStyle->shapeOutside()) || style().shapeOutside())
updateShapeOutsideInfoAfterStyleChange(style(), oldStyle);
#endif
}
#if ENABLE(CSS_SHAPES)
void RenderBox::updateShapeOutsideInfoAfterStyleChange(const RenderStyle& style, const RenderStyle* oldStyle)
{
const ShapeValue* shapeOutside = style.shapeOutside();
const ShapeValue* oldShapeOutside = oldStyle ? oldStyle->shapeOutside() : nullptr;
Length shapeMargin = style.shapeMargin();
Length oldShapeMargin = oldStyle ? oldStyle->shapeMargin() : RenderStyle::initialShapeMargin();
float shapeImageThreshold = style.shapeImageThreshold();
float oldShapeImageThreshold = oldStyle ? oldStyle->shapeImageThreshold() : RenderStyle::initialShapeImageThreshold();
// FIXME: A future optimization would do a deep comparison for equality. (bug 100811)
if (shapeOutside == oldShapeOutside && shapeMargin == oldShapeMargin && shapeImageThreshold == oldShapeImageThreshold)
return;
if (!shapeOutside)
ShapeOutsideInfo::removeInfo(*this);
else
ShapeOutsideInfo::ensureInfo(*this).markShapeAsDirty();
if (shapeOutside || shapeOutside != oldShapeOutside)
markShapeOutsideDependentsForLayout();
}
#endif
void RenderBox::updateFromStyle()
{
RenderBoxModelObject::updateFromStyle();
const RenderStyle& styleToUse = style();
bool isRootObject = isRoot();
bool isViewObject = isRenderView();
// The root and the RenderView always paint their backgrounds/borders.
if (isRootObject || isViewObject)
setHasBoxDecorations(true);
setFloating(!isOutOfFlowPositioned() && styleToUse.isFloating());
// We also handle <body> and <html>, whose overflow applies to the viewport.
if (styleToUse.overflowX() != OVISIBLE && !isRootObject && isRenderBlock()) {
bool boxHasOverflowClip = true;
if (isBody()) {
// Overflow on the body can propagate to the viewport under the following conditions.
// (1) The root element is <html>.
// (2) We are the primary <body> (can be checked by looking at document.body).
// (3) The root element has visible overflow.
if (is<HTMLHtmlElement>(*document().documentElement())
&& document().body() == element()
&& document().documentElement()->renderer()->style().overflowX() == OVISIBLE) {
boxHasOverflowClip = false;
}
}
// Check for overflow clip.
// It's sufficient to just check one direction, since it's illegal to have visible on only one overflow value.
if (boxHasOverflowClip) {
if (!s_hadOverflowClip)
// Erase the overflow
repaint();
setHasOverflowClip();
}
}
setHasTransformRelatedProperty(styleToUse.hasTransformRelatedProperty());
setHasReflection(styleToUse.boxReflect());
}
void RenderBox::layout()
{
StackStats::LayoutCheckPoint layoutCheckPoint;
ASSERT(needsLayout());
RenderObject* child = firstChild();
if (!child) {
clearNeedsLayout();
return;
}
LayoutStateMaintainer statePusher(view(), *this, locationOffset(), style().isFlippedBlocksWritingMode());
while (child) {
if (child->needsLayout())
downcast<RenderElement>(*child).layout();
ASSERT(!child->needsLayout());
child = child->nextSibling();
}
statePusher.pop();
invalidateBackgroundObscurationStatus();
clearNeedsLayout();
}
// More IE extensions. clientWidth and clientHeight represent the interior of an object
// excluding border and scrollbar.
LayoutUnit RenderBox::clientWidth() const
{
return width() - borderLeft() - borderRight() - verticalScrollbarWidth();
}
LayoutUnit RenderBox::clientHeight() const
{
return height() - borderTop() - borderBottom() - horizontalScrollbarHeight();
}
int RenderBox::pixelSnappedClientWidth() const
{
// FIXME: This should use snappedIntSize() instead with absolute coordinates.
return roundToInt(clientWidth());
}
int RenderBox::pixelSnappedClientHeight() const
{
// FIXME: This should use snappedIntSize() instead with absolute coordinates.
return roundToInt(clientHeight());
}
int RenderBox::pixelSnappedOffsetWidth() const
{
// FIXME: This should use snappedIntSize() instead with absolute coordinates.
return roundToInt(offsetWidth());
}
int RenderBox::pixelSnappedOffsetHeight() const
{
// FIXME: This should use snappedIntSize() instead with absolute coordinates.
return roundToInt(offsetHeight());
}
int RenderBox::scrollWidth() const
{
if (hasOverflowClip())
return layer()->scrollWidth();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
if (style().isLeftToRightDirection()) {
// FIXME: This should use snappedIntSize() instead with absolute coordinates.
return roundToInt(std::max(clientWidth(), layoutOverflowRect().maxX() - borderLeft()));
}
return clientWidth() - std::min<LayoutUnit>(0, layoutOverflowRect().x() - borderLeft());
}
int RenderBox::scrollHeight() const
{
if (hasOverflowClip())
return layer()->scrollHeight();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
// FIXME: This should use snappedIntSize() instead with absolute coordinates.
return roundToInt(std::max(clientHeight(), layoutOverflowRect().maxY() - borderTop()));
}
int RenderBox::scrollLeft() const
{
return hasOverflowClip() ? layer()->scrollXOffset() : 0;
}
int RenderBox::scrollTop() const
{
return hasOverflowClip() ? layer()->scrollYOffset() : 0;
}
static void setupWheelEventTestTrigger(RenderLayer& layer, Frame* frame)
{
if (!frame)
return;
Page* page = frame->page();
if (!page || !page->expectsWheelEventTriggers())
return;
layer.scrollAnimator().setWheelEventTestTrigger(page->testTrigger());
}
void RenderBox::setScrollLeft(int newLeft)
{
if (hasOverflowClip()) {
setupWheelEventTestTrigger(*layer(), document().frame());
layer()->scrollToXOffset(newLeft, RenderLayer::ScrollOffsetClamped);
}
}
void RenderBox::setScrollTop(int newTop)
{
if (hasOverflowClip()) {
setupWheelEventTestTrigger(*layer(), document().frame());
layer()->scrollToYOffset(newTop, RenderLayer::ScrollOffsetClamped);
}
}
void RenderBox::absoluteRects(Vector<IntRect>& rects, const LayoutPoint& accumulatedOffset) const
{
rects.append(snappedIntRect(accumulatedOffset, size()));
}
void RenderBox::absoluteQuads(Vector<FloatQuad>& quads, bool* wasFixed) const
{
FloatRect localRect(0, 0, width(), height());
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread && flowThread->absoluteQuadsForBox(quads, wasFixed, this, localRect.y(), localRect.maxY()))
return;
quads.append(localToAbsoluteQuad(localRect, UseTransforms, wasFixed));
}
void RenderBox::updateLayerTransform()
{
// Transform-origin depends on box size, so we need to update the layer transform after layout.
if (hasLayer())
layer()->updateTransform();
}
LayoutUnit RenderBox::constrainLogicalWidthInRegionByMinMax(LayoutUnit logicalWidth, LayoutUnit availableWidth, RenderBlock* cb, RenderRegion* region) const
{
const RenderStyle& styleToUse = style();
if (!styleToUse.logicalMaxWidth().isUndefined())
logicalWidth = std::min(logicalWidth, computeLogicalWidthInRegionUsing(MaxSize, styleToUse.logicalMaxWidth(), availableWidth, cb, region));
return std::max(logicalWidth, computeLogicalWidthInRegionUsing(MinSize, styleToUse.logicalMinWidth(), availableWidth, cb, region));
}
LayoutUnit RenderBox::constrainLogicalHeightByMinMax(LayoutUnit logicalHeight) const
{
const RenderStyle& styleToUse = style();
if (!styleToUse.logicalMaxHeight().isUndefined()) {
LayoutUnit maxH = computeLogicalHeightUsing(styleToUse.logicalMaxHeight());
if (maxH != -1)
logicalHeight = std::min(logicalHeight, maxH);
}
return std::max(logicalHeight, computeLogicalHeightUsing(styleToUse.logicalMinHeight()));
}
LayoutUnit RenderBox::constrainContentBoxLogicalHeightByMinMax(LayoutUnit logicalHeight) const
{
const RenderStyle& styleToUse = style();
if (!styleToUse.logicalMaxHeight().isUndefined()) {
LayoutUnit maxH = computeContentLogicalHeight(styleToUse.logicalMaxHeight());
if (maxH != -1)
logicalHeight = std::min(logicalHeight, maxH);
}
return std::max(logicalHeight, computeContentLogicalHeight(styleToUse.logicalMinHeight()));
}
RoundedRect::Radii RenderBox::borderRadii() const
{
RenderStyle& style = this->style();
LayoutRect bounds = frameRect();
unsigned borderLeft = style.borderLeftWidth();
unsigned borderTop = style.borderTopWidth();
bounds.moveBy(LayoutPoint(borderLeft, borderTop));
bounds.contract(borderLeft + style.borderRightWidth(), borderTop + style.borderBottomWidth());
return style.getRoundedBorderFor(bounds).radii();
}
IntRect RenderBox::absoluteContentBox() const
{
// This is wrong with transforms and flipped writing modes.
IntRect rect = snappedIntRect(contentBoxRect());
FloatPoint absPos = localToAbsolute();
rect.move(absPos.x(), absPos.y());
return rect;
}
FloatQuad RenderBox::absoluteContentQuad() const
{
LayoutRect rect = contentBoxRect();
return localToAbsoluteQuad(FloatRect(rect));
}
LayoutRect RenderBox::outlineBoundsForRepaint(const RenderLayerModelObject* repaintContainer, const RenderGeometryMap* geometryMap) const
{
LayoutRect box = borderBoundingBox();
adjustRectForOutlineAndShadow(box);
if (repaintContainer != this) {
FloatQuad containerRelativeQuad;
if (geometryMap)
containerRelativeQuad = geometryMap->mapToContainer(box, repaintContainer);
else
containerRelativeQuad = localToContainerQuad(FloatRect(box), repaintContainer);
box = LayoutRect(containerRelativeQuad.boundingBox());
}
// FIXME: layoutDelta needs to be applied in parts before/after transforms and
// repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
box.move(view().layoutDelta());
return LayoutRect(snapRectToDevicePixels(box, document().deviceScaleFactor()));
}
void RenderBox::addFocusRingRects(Vector<IntRect>& rects, const LayoutPoint& additionalOffset, const RenderLayerModelObject*)
{
if (!size().isEmpty())
rects.append(snappedIntRect(additionalOffset, size()));
}
int RenderBox::reflectionOffset() const
{
if (!style().boxReflect())
return 0;
if (style().boxReflect()->direction() == ReflectionLeft || style().boxReflect()->direction() == ReflectionRight)
return valueForLength(style().boxReflect()->offset(), borderBoxRect().width());
return valueForLength(style().boxReflect()->offset(), borderBoxRect().height());
}
LayoutRect RenderBox::reflectedRect(const LayoutRect& r) const
{
if (!style().boxReflect())
return LayoutRect();
LayoutRect box = borderBoxRect();
LayoutRect result = r;
switch (style().boxReflect()->direction()) {
case ReflectionBelow:
result.setY(box.maxY() + reflectionOffset() + (box.maxY() - r.maxY()));
break;
case ReflectionAbove:
result.setY(box.y() - reflectionOffset() - box.height() + (box.maxY() - r.maxY()));
break;
case ReflectionLeft:
result.setX(box.x() - reflectionOffset() - box.width() + (box.maxX() - r.maxX()));
break;
case ReflectionRight:
result.setX(box.maxX() + reflectionOffset() + (box.maxX() - r.maxX()));
break;
}
return result;
}
bool RenderBox::fixedElementLaysOutRelativeToFrame(const FrameView& frameView) const
{
return style().position() == FixedPosition && container()->isRenderView() && frameView.fixedElementsLayoutRelativeToFrame();
}
bool RenderBox::includeVerticalScrollbarSize() const
{
return hasOverflowClip() && !layer()->hasOverlayScrollbars()
&& (style().overflowY() == OSCROLL || style().overflowY() == OAUTO);
}
bool RenderBox::includeHorizontalScrollbarSize() const
{
return hasOverflowClip() && !layer()->hasOverlayScrollbars()
&& (style().overflowX() == OSCROLL || style().overflowX() == OAUTO);
}
int RenderBox::verticalScrollbarWidth() const
{
return includeVerticalScrollbarSize() ? layer()->verticalScrollbarWidth() : 0;
}
int RenderBox::horizontalScrollbarHeight() const
{
return includeHorizontalScrollbarSize() ? layer()->horizontalScrollbarHeight() : 0;
}
int RenderBox::intrinsicScrollbarLogicalWidth() const
{
if (!hasOverflowClip())
return 0;
if (isHorizontalWritingMode() && (style().overflowY() == OSCROLL && !hasVerticalScrollbarWithAutoBehavior())) {
ASSERT(layer()->hasVerticalScrollbar());
return verticalScrollbarWidth();
}
if (!isHorizontalWritingMode() && (style().overflowX() == OSCROLL && !hasHorizontalScrollbarWithAutoBehavior())) {
ASSERT(layer()->hasHorizontalScrollbar());
return horizontalScrollbarHeight();
}
return 0;
}
bool RenderBox::scrollLayer(ScrollDirection direction, ScrollGranularity granularity, float multiplier, Element** stopElement)
{
RenderLayer* boxLayer = layer();
if (boxLayer && boxLayer->scroll(direction, granularity, multiplier)) {
if (stopElement)
*stopElement = element();
return true;
}
return false;
}
bool RenderBox::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier, Element** stopElement, RenderBox* startBox, const IntPoint& wheelEventAbsolutePoint)
{
if (scrollLayer(direction, granularity, multiplier, stopElement))
return true;
if (stopElement && *stopElement && *stopElement == element())
return true;
RenderBlock* nextScrollBlock = containingBlock();
if (is<RenderNamedFlowThread>(nextScrollBlock)) {
ASSERT(startBox);
nextScrollBlock = downcast<RenderNamedFlowThread>(*nextScrollBlock).fragmentFromAbsolutePointAndBox(wheelEventAbsolutePoint, *startBox);
}
if (nextScrollBlock && !nextScrollBlock->isRenderView())
return nextScrollBlock->scroll(direction, granularity, multiplier, stopElement, startBox, wheelEventAbsolutePoint);
return false;
}
bool RenderBox::logicalScroll(ScrollLogicalDirection direction, ScrollGranularity granularity, float multiplier, Element** stopElement)
{
bool scrolled = false;
RenderLayer* l = layer();
if (l) {
#if PLATFORM(COCOA)
// On Mac only we reset the inline direction position when doing a document scroll (e.g., hitting Home/End).
if (granularity == ScrollByDocument)
scrolled = l->scroll(logicalToPhysical(ScrollInlineDirectionBackward, isHorizontalWritingMode(), style().isFlippedBlocksWritingMode()), ScrollByDocument, multiplier);
#endif
if (l->scroll(logicalToPhysical(direction, isHorizontalWritingMode(), style().isFlippedBlocksWritingMode()), granularity, multiplier))
scrolled = true;
if (scrolled) {
if (stopElement)
*stopElement = element();
return true;
}
}
if (stopElement && *stopElement && *stopElement == element())
return true;
RenderBlock* b = containingBlock();
if (b && !b->isRenderView())
return b->logicalScroll(direction, granularity, multiplier, stopElement);
return false;
}
bool RenderBox::canBeScrolledAndHasScrollableArea() const
{
return canBeProgramaticallyScrolled() && (scrollHeight() != roundToInt(clientHeight()) || scrollWidth() != roundToInt(clientWidth()));
}
bool RenderBox::isScrollableOrRubberbandableBox() const
{
return canBeScrolledAndHasScrollableArea();
}
bool RenderBox::canBeProgramaticallyScrolled() const
{
if (isRenderView())
return true;
if (!hasOverflowClip())
return false;
bool hasScrollableOverflow = hasScrollableOverflowX() || hasScrollableOverflowY();
if (scrollsOverflow() && hasScrollableOverflow)
return true;
return element() && element()->hasEditableStyle();
}
bool RenderBox::usesCompositedScrolling() const
{
return hasOverflowClip() && hasLayer() && layer()->usesCompositedScrolling();
}
void RenderBox::autoscroll(const IntPoint& position)
{
if (layer())
layer()->autoscroll(position);
}
// There are two kinds of renderer that can autoscroll.
bool RenderBox::canAutoscroll() const
{
if (isRenderView())
return view().frameView().isScrollable();
// Check for a box that can be scrolled in its own right.
if (canBeScrolledAndHasScrollableArea())
return true;
return false;
}
// If specified point is in border belt, returned offset denotes direction of
// scrolling.
IntSize RenderBox::calculateAutoscrollDirection(const IntPoint& windowPoint) const
{
IntRect box(absoluteBoundingBoxRect());
box.move(view().frameView().scrollOffset());
IntRect windowBox = view().frameView().contentsToWindow(box);
IntPoint windowAutoscrollPoint = windowPoint;
if (windowAutoscrollPoint.x() < windowBox.x() + autoscrollBeltSize)
windowAutoscrollPoint.move(-autoscrollBeltSize, 0);
else if (windowAutoscrollPoint.x() > windowBox.maxX() - autoscrollBeltSize)
windowAutoscrollPoint.move(autoscrollBeltSize, 0);
if (windowAutoscrollPoint.y() < windowBox.y() + autoscrollBeltSize)
windowAutoscrollPoint.move(0, -autoscrollBeltSize);
else if (windowAutoscrollPoint.y() > windowBox.maxY() - autoscrollBeltSize)
windowAutoscrollPoint.move(0, autoscrollBeltSize);
return windowAutoscrollPoint - windowPoint;
}
RenderBox* RenderBox::findAutoscrollable(RenderObject* renderer)
{
while (renderer && !(is<RenderBox>(*renderer) && downcast<RenderBox>(*renderer).canAutoscroll())) {
if (is<RenderView>(*renderer) && renderer->document().ownerElement())
renderer = renderer->document().ownerElement()->renderer();
else
renderer = renderer->parent();
}
return is<RenderBox>(renderer) ? downcast<RenderBox>(renderer) : nullptr;
}
void RenderBox::panScroll(const IntPoint& source)
{
if (layer())
layer()->panScrollFromPoint(source);
}
bool RenderBox::hasVerticalScrollbarWithAutoBehavior() const
{
bool overflowScrollActsLikeAuto = style().overflowY() == OSCROLL && !style().hasPseudoStyle(SCROLLBAR) && ScrollbarTheme::theme()->usesOverlayScrollbars();
return hasOverflowClip() && (style().overflowY() == OAUTO || style().overflowY() == OOVERLAY || overflowScrollActsLikeAuto);
}
bool RenderBox::hasHorizontalScrollbarWithAutoBehavior() const
{
bool overflowScrollActsLikeAuto = style().overflowX() == OSCROLL && !style().hasPseudoStyle(SCROLLBAR) && ScrollbarTheme::theme()->usesOverlayScrollbars();
return hasOverflowClip() && (style().overflowX() == OAUTO || style().overflowX() == OOVERLAY || overflowScrollActsLikeAuto);
}
bool RenderBox::needsPreferredWidthsRecalculation() const
{
return style().paddingStart().isPercentOrCalculated() || style().paddingEnd().isPercentOrCalculated();
}
IntSize RenderBox::scrolledContentOffset() const
{
if (!hasOverflowClip())
return IntSize();
ASSERT(hasLayer());
return layer()->scrolledContentOffset();
}
LayoutSize RenderBox::cachedSizeForOverflowClip() const
{
ASSERT(hasOverflowClip());
ASSERT(hasLayer());
return layer()->size();
}
void RenderBox::applyCachedClipAndScrollOffsetForRepaint(LayoutRect& paintRect) const
{
flipForWritingMode(paintRect);
paintRect.move(-scrolledContentOffset()); // For overflow:auto/scroll/hidden.
// Do not clip scroll layer contents to reduce the number of repaints while scrolling.
if (usesCompositedScrolling()) {
flipForWritingMode(paintRect);
return;
}
// height() is inaccurate if we're in the middle of a layout of this RenderBox, so use the
// layer's size instead. Even if the layer's size is wrong, the layer itself will repaint
// anyway if its size does change.
LayoutRect clipRect(LayoutPoint(), cachedSizeForOverflowClip());
paintRect = intersection(paintRect, clipRect);
flipForWritingMode(paintRect);
}
void RenderBox::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
minLogicalWidth = minPreferredLogicalWidth() - borderAndPaddingLogicalWidth();
maxLogicalWidth = maxPreferredLogicalWidth() - borderAndPaddingLogicalWidth();
}
LayoutUnit RenderBox::minPreferredLogicalWidth() const
{
if (preferredLogicalWidthsDirty()) {
#ifndef NDEBUG
SetLayoutNeededForbiddenScope layoutForbiddenScope(const_cast<RenderBox*>(this));
#endif
const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
}
return m_minPreferredLogicalWidth;
}
LayoutUnit RenderBox::maxPreferredLogicalWidth() const
{
if (preferredLogicalWidthsDirty()) {
#ifndef NDEBUG
SetLayoutNeededForbiddenScope layoutForbiddenScope(const_cast<RenderBox*>(this));
#endif
const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
}
return m_maxPreferredLogicalWidth;
}
bool RenderBox::hasOverrideLogicalContentHeight() const
{
return gOverrideHeightMap && gOverrideHeightMap->contains(this);
}
bool RenderBox::hasOverrideLogicalContentWidth() const
{
return gOverrideWidthMap && gOverrideWidthMap->contains(this);
}
void RenderBox::setOverrideLogicalContentHeight(LayoutUnit height)
{
if (!gOverrideHeightMap)
gOverrideHeightMap = new OverrideSizeMap();
gOverrideHeightMap->set(this, height);
}
void RenderBox::setOverrideLogicalContentWidth(LayoutUnit width)
{
if (!gOverrideWidthMap)
gOverrideWidthMap = new OverrideSizeMap();
gOverrideWidthMap->set(this, width);
}
void RenderBox::clearOverrideLogicalContentHeight()
{
if (gOverrideHeightMap)
gOverrideHeightMap->remove(this);
}
void RenderBox::clearOverrideLogicalContentWidth()
{
if (gOverrideWidthMap)
gOverrideWidthMap->remove(this);
}
void RenderBox::clearOverrideSize()
{
clearOverrideLogicalContentHeight();
clearOverrideLogicalContentWidth();
}
LayoutUnit RenderBox::overrideLogicalContentWidth() const
{
ASSERT(hasOverrideLogicalContentWidth());
return gOverrideWidthMap->get(this);
}
LayoutUnit RenderBox::overrideLogicalContentHeight() const
{
ASSERT(hasOverrideLogicalContentHeight());
return gOverrideHeightMap->get(this);
}
#if ENABLE(CSS_GRID_LAYOUT)
LayoutUnit RenderBox::overrideContainingBlockContentLogicalWidth() const
{
ASSERT(hasOverrideContainingBlockLogicalWidth());
return gOverrideContainingBlockLogicalWidthMap->get(this);
}
LayoutUnit RenderBox::overrideContainingBlockContentLogicalHeight() const
{
ASSERT(hasOverrideContainingBlockLogicalHeight());
return gOverrideContainingBlockLogicalHeightMap->get(this);
}
bool RenderBox::hasOverrideContainingBlockLogicalWidth() const
{
return gOverrideContainingBlockLogicalWidthMap && gOverrideContainingBlockLogicalWidthMap->contains(this);
}
bool RenderBox::hasOverrideContainingBlockLogicalHeight() const
{
return gOverrideContainingBlockLogicalHeightMap && gOverrideContainingBlockLogicalHeightMap->contains(this);
}
void RenderBox::setOverrideContainingBlockContentLogicalWidth(LayoutUnit logicalWidth)
{
if (!gOverrideContainingBlockLogicalWidthMap)
gOverrideContainingBlockLogicalWidthMap = new OverrideSizeMap;
gOverrideContainingBlockLogicalWidthMap->set(this, logicalWidth);
}
void RenderBox::setOverrideContainingBlockContentLogicalHeight(LayoutUnit logicalHeight)
{
if (!gOverrideContainingBlockLogicalHeightMap)
gOverrideContainingBlockLogicalHeightMap = new OverrideSizeMap;
gOverrideContainingBlockLogicalHeightMap->set(this, logicalHeight);
}
void RenderBox::clearContainingBlockOverrideSize()
{
if (gOverrideContainingBlockLogicalWidthMap)
gOverrideContainingBlockLogicalWidthMap->remove(this);
clearOverrideContainingBlockContentLogicalHeight();
}
void RenderBox::clearOverrideContainingBlockContentLogicalHeight()
{
if (gOverrideContainingBlockLogicalHeightMap)
gOverrideContainingBlockLogicalHeightMap->remove(this);
}
#endif // ENABLE(CSS_GRID_LAYOUT)
LayoutUnit RenderBox::adjustBorderBoxLogicalWidthForBoxSizing(LayoutUnit width) const
{
LayoutUnit bordersPlusPadding = borderAndPaddingLogicalWidth();
if (style().boxSizing() == CONTENT_BOX)
return width + bordersPlusPadding;
return std::max(width, bordersPlusPadding);
}
LayoutUnit RenderBox::adjustBorderBoxLogicalHeightForBoxSizing(LayoutUnit height) const
{
LayoutUnit bordersPlusPadding = borderAndPaddingLogicalHeight();
if (style().boxSizing() == CONTENT_BOX)
return height + bordersPlusPadding;
return std::max(height, bordersPlusPadding);
}
LayoutUnit RenderBox::adjustContentBoxLogicalWidthForBoxSizing(LayoutUnit width) const
{
if (style().boxSizing() == BORDER_BOX)
width -= borderAndPaddingLogicalWidth();
return std::max<LayoutUnit>(0, width);
}
LayoutUnit RenderBox::adjustContentBoxLogicalHeightForBoxSizing(LayoutUnit height) const
{
if (style().boxSizing() == BORDER_BOX)
height -= borderAndPaddingLogicalHeight();
return std::max<LayoutUnit>(0, height);
}
// Hit Testing
bool RenderBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
{
LayoutPoint adjustedLocation = accumulatedOffset + location();
// Check kids first.
for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
if (!child->hasLayer() && child->nodeAtPoint(request, result, locationInContainer, adjustedLocation, action)) {
updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
return true;
}
}
RenderFlowThread* flowThread = flowThreadContainingBlock();
RenderRegion* regionToUse = flowThread ? downcast<RenderNamedFlowFragment>(flowThread->currentRegion()) : nullptr;
// If the box is not contained by this region there's no point in going further.
if (regionToUse && !flowThread->objectShouldFragmentInFlowRegion(this, regionToUse))
return false;
// Check our bounds next. For this purpose always assume that we can only be hit in the
// foreground phase (which is true for replaced elements like images).
LayoutRect boundsRect = borderBoxRectInRegion(regionToUse);
boundsRect.moveBy(adjustedLocation);
if (visibleToHitTesting() && action == HitTestForeground && locationInContainer.intersects(boundsRect)) {
updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
if (!result.addNodeToRectBasedTestResult(element(), request, locationInContainer, boundsRect))
return true;
}
return false;
}
// --------------------- painting stuff -------------------------------
void RenderBox::paintRootBoxFillLayers(const PaintInfo& paintInfo)
{
if (paintInfo.skipRootBackground())
return;
auto& rootBackgroundRenderer = rendererForRootBackground();
const FillLayer* bgLayer = rootBackgroundRenderer.style().backgroundLayers();
Color bgColor = rootBackgroundRenderer.style().visitedDependentColor(CSSPropertyBackgroundColor);
paintFillLayers(paintInfo, bgColor, bgLayer, view().backgroundRect(this), BackgroundBleedNone, CompositeSourceOver, &rootBackgroundRenderer);
}
BackgroundBleedAvoidance RenderBox::determineBackgroundBleedAvoidance(GraphicsContext* context) const
{
if (context->paintingDisabled())
return BackgroundBleedNone;
const RenderStyle& style = this->style();
if (!style.hasBackground() || !style.hasBorder() || !style.hasBorderRadius() || borderImageIsLoadedAndCanBeRendered())
return BackgroundBleedNone;
AffineTransform ctm = context->getCTM();
FloatSize contextScaling(static_cast<float>(ctm.xScale()), static_cast<float>(ctm.yScale()));
// Because RoundedRect uses IntRect internally the inset applied by the
// BackgroundBleedShrinkBackground strategy cannot be less than one integer
// layout coordinate, even with subpixel layout enabled. To take that into
// account, we clamp the contextScaling to 1.0 for the following test so
// that borderObscuresBackgroundEdge can only return true if the border
// widths are greater than 2 in both layout coordinates and screen
// coordinates.
// This precaution will become obsolete if RoundedRect is ever promoted to
// a sub-pixel representation.
if (contextScaling.width() > 1)
contextScaling.setWidth(1);
if (contextScaling.height() > 1)
contextScaling.setHeight(1);
if (borderObscuresBackgroundEdge(contextScaling))
return BackgroundBleedShrinkBackground;
if (!style.hasAppearance() && borderObscuresBackground() && backgroundHasOpaqueTopLayer())
return BackgroundBleedBackgroundOverBorder;
return BackgroundBleedUseTransparencyLayer;
}
void RenderBox::paintBoxDecorations(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(*this))
return;
LayoutRect paintRect = borderBoxRectInRegion(currentRenderNamedFlowFragment());
paintRect.moveBy(paintOffset);
#if PLATFORM(IOS)
// Workaround for <rdar://problem/6209763>. Force the painting bounds of checkboxes and radio controls to be square.
if (style().appearance() == CheckboxPart || style().appearance() == RadioPart) {
int width = std::min(paintRect.width(), paintRect.height());
int height = width;
paintRect = IntRect(paintRect.x(), paintRect.y() + (this->height() - height) / 2, width, height); // Vertically center the checkbox, like on desktop
}
#endif
BackgroundBleedAvoidance bleedAvoidance = determineBackgroundBleedAvoidance(paintInfo.context);
// FIXME: Should eventually give the theme control over whether the box shadow should paint, since controls could have
// custom shadows of their own.
if (!boxShadowShouldBeAppliedToBackground(paintRect.location(), bleedAvoidance))
paintBoxShadow(paintInfo, paintRect, style(), Normal);
GraphicsContextStateSaver stateSaver(*paintInfo.context, false);
if (bleedAvoidance == BackgroundBleedUseTransparencyLayer) {
// To avoid the background color bleeding out behind the border, we'll render background and border
// into a transparency layer, and then clip that in one go (which requires setting up the clip before
// beginning the layer).
stateSaver.save();
paintInfo.context->clipRoundedRect(style().getRoundedBorderFor(paintRect).pixelSnappedRoundedRectForPainting(document().deviceScaleFactor()));
paintInfo.context->beginTransparencyLayer(1);
}
// If we have a native theme appearance, paint that before painting our background.
// The theme will tell us whether or not we should also paint the CSS background.
ControlStates* controlStates = nullptr;
if (style().hasAppearance()) {
if (hasControlStatesForRenderer(this))
controlStates = controlStatesForRenderer(this);
else {
controlStates = new ControlStates();
addControlStatesForRenderer(this, controlStates);
}
}
bool themePainted = style().hasAppearance() && !theme().paint(*this, controlStates, paintInfo, paintRect);
if (controlStates && controlStates->needsRepaint())
view().scheduleLazyRepaint(*this);
if (!themePainted) {
if (bleedAvoidance == BackgroundBleedBackgroundOverBorder)
paintBorder(paintInfo, paintRect, style(), bleedAvoidance);
paintBackground(paintInfo, paintRect, bleedAvoidance);
if (style().hasAppearance())
theme().paintDecorations(*this, paintInfo, paintRect);
}
paintBoxShadow(paintInfo, paintRect, style(), Inset);
// The theme will tell us whether or not we should also paint the CSS border.
if (bleedAvoidance != BackgroundBleedBackgroundOverBorder && (!style().hasAppearance() || (!themePainted && theme().paintBorderOnly(*this, paintInfo, paintRect))) && style().hasBorderDecoration())
paintBorder(paintInfo, paintRect, style(), bleedAvoidance);
if (bleedAvoidance == BackgroundBleedUseTransparencyLayer)
paintInfo.context->endTransparencyLayer();
}
void RenderBox::paintBackground(const PaintInfo& paintInfo, const LayoutRect& paintRect, BackgroundBleedAvoidance bleedAvoidance)
{
if (isRoot()) {
paintRootBoxFillLayers(paintInfo);
return;
}
if (isBody() && skipBodyBackground(this))
return;
if (backgroundIsKnownToBeObscured(paintRect.location()) && !boxShadowShouldBeAppliedToBackground(paintRect.location(), bleedAvoidance))
return;
paintFillLayers(paintInfo, style().visitedDependentColor(CSSPropertyBackgroundColor), style().backgroundLayers(), paintRect, bleedAvoidance);
}
bool RenderBox::getBackgroundPaintedExtent(const LayoutPoint& paintOffset, LayoutRect& paintedExtent) const
{
ASSERT(hasBackground());
LayoutRect backgroundRect = snappedIntRect(borderBoxRect());
Color backgroundColor = style().visitedDependentColor(CSSPropertyBackgroundColor);
if (backgroundColor.isValid() && backgroundColor.alpha()) {
paintedExtent = backgroundRect;
return true;
}
if (!style().backgroundLayers()->image() || style().backgroundLayers()->next()) {
paintedExtent = backgroundRect;
return true;
}
BackgroundImageGeometry geometry = calculateBackgroundImageGeometry(nullptr, *style().backgroundLayers(), paintOffset, backgroundRect);
paintedExtent = geometry.destRect();
return !geometry.hasNonLocalGeometry();
}
bool RenderBox::backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const
{
if (isBody() && skipBodyBackground(this))
return false;
Color backgroundColor = style().visitedDependentColor(CSSPropertyBackgroundColor);
if (!backgroundColor.isValid() || backgroundColor.hasAlpha())
return false;
// If the element has appearance, it might be painted by theme.
// We cannot be sure if theme paints the background opaque.
// In this case it is safe to not assume opaqueness.
// FIXME: May be ask theme if it paints opaque.
if (style().hasAppearance())
return false;
// FIXME: Check the opaqueness of background images.
if (hasClip() || hasClipPath())
return false;
// FIXME: Use rounded rect if border radius is present.
if (style().hasBorderRadius())
return false;
// FIXME: The background color clip is defined by the last layer.
if (style().backgroundLayers()->next())
return false;
LayoutRect backgroundRect;
switch (style().backgroundClip()) {
case BorderFillBox:
backgroundRect = borderBoxRect();
break;
case PaddingFillBox:
backgroundRect = paddingBoxRect();
break;
case ContentFillBox:
backgroundRect = contentBoxRect();
break;
default:
break;
}
return backgroundRect.contains(localRect);
}
static bool isCandidateForOpaquenessTest(const RenderBox& childBox)
{
const RenderStyle& childStyle = childBox.style();
if (childStyle.position() != StaticPosition && childBox.containingBlock() != childBox.parent())
return false;
if (childStyle.visibility() != VISIBLE)
return false;
#if ENABLE(CSS_SHAPES)
if (childStyle.shapeOutside())
return false;
#endif
if (!childBox.width() || !childBox.height())
return false;
if (RenderLayer* childLayer = childBox.layer()) {
if (childLayer->isComposited())
return false;
// FIXME: Deal with z-index.
if (!childStyle.hasAutoZIndex())
return false;
if (childLayer->hasTransform() || childLayer->isTransparent() || childLayer->hasFilter())
return false;
if (!childBox.scrolledContentOffset().isZero())
return false;
}
return true;
}
bool RenderBox::foregroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect, unsigned maxDepthToTest) const
{
if (!maxDepthToTest)
return false;
for (auto& childBox : childrenOfType<RenderBox>(*this)) {
if (!isCandidateForOpaquenessTest(childBox))
continue;
LayoutPoint childLocation = childBox.location();
if (childBox.isRelPositioned())
childLocation.move(childBox.relativePositionOffset());
LayoutRect childLocalRect = localRect;
childLocalRect.moveBy(-childLocation);
if (childLocalRect.y() < 0 || childLocalRect.x() < 0) {
// If there is unobscured area above/left of a static positioned box then the rect is probably not covered.
if (childBox.style().position() == StaticPosition)
return false;
continue;
}
if (childLocalRect.maxY() > childBox.height() || childLocalRect.maxX() > childBox.width())
continue;
if (childBox.backgroundIsKnownToBeOpaqueInRect(childLocalRect))
return true;
if (childBox.foregroundIsKnownToBeOpaqueInRect(childLocalRect, maxDepthToTest - 1))
return true;
}
return false;
}
bool RenderBox::computeBackgroundIsKnownToBeObscured(const LayoutPoint& paintOffset)
{
// Test to see if the children trivially obscure the background.
// FIXME: This test can be much more comprehensive.
if (!hasBackground())
return false;
// Table and root background painting is special.
if (isTable() || isRoot())
return false;
LayoutRect backgroundRect;
if (!getBackgroundPaintedExtent(paintOffset, backgroundRect))
return false;
return foregroundIsKnownToBeOpaqueInRect(backgroundRect, backgroundObscurationTestMaxDepth);
}
bool RenderBox::backgroundHasOpaqueTopLayer() const
{
const FillLayer* fillLayer = style().backgroundLayers();
if (!fillLayer || fillLayer->clip() != BorderFillBox)
return false;
// Clipped with local scrolling
if (hasOverflowClip() && fillLayer->attachment() == LocalBackgroundAttachment)
return false;
if (fillLayer->hasOpaqueImage(*this) && fillLayer->hasRepeatXY() && fillLayer->image()->canRender(this, style().effectiveZoom()))
return true;
// If there is only one layer and no image, check whether the background color is opaque
if (!fillLayer->next() && !fillLayer->hasImage()) {
Color bgColor = style().visitedDependentColor(CSSPropertyBackgroundColor);
if (bgColor.isValid() && bgColor.alpha() == 255)
return true;
}
return false;
}
void RenderBox::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(*this) || style().visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask || paintInfo.context->paintingDisabled())
return;
LayoutRect paintRect = LayoutRect(paintOffset, size());
paintMaskImages(paintInfo, paintRect);
}
void RenderBox::paintClippingMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(*this) || style().visibility() != VISIBLE || paintInfo.phase != PaintPhaseClippingMask || paintInfo.context->paintingDisabled())
return;
LayoutRect paintRect = LayoutRect(paintOffset, size());
paintInfo.context->fillRect(snappedIntRect(paintRect), Color::black, style().colorSpace());
}
void RenderBox::paintMaskImages(const PaintInfo& paintInfo, const LayoutRect& paintRect)
{
// Figure out if we need to push a transparency layer to render our mask.
bool pushTransparencyLayer = false;
bool compositedMask = hasLayer() && layer()->hasCompositedMask();
bool flattenCompositingLayers = view().frameView().paintBehavior() & PaintBehaviorFlattenCompositingLayers;
CompositeOperator compositeOp = CompositeSourceOver;
bool allMaskImagesLoaded = true;
if (!compositedMask || flattenCompositingLayers) {
pushTransparencyLayer = true;
StyleImage* maskBoxImage = style().maskBoxImage().image();
const FillLayer* maskLayers = style().maskLayers();
// Don't render a masked element until all the mask images have loaded, to prevent a flash of unmasked content.
if (maskBoxImage)
allMaskImagesLoaded &= maskBoxImage->isLoaded();
if (maskLayers)
allMaskImagesLoaded &= maskLayers->imagesAreLoaded();
paintInfo.context->setCompositeOperation(CompositeDestinationIn);
paintInfo.context->beginTransparencyLayer(1);
compositeOp = CompositeSourceOver;
}
if (allMaskImagesLoaded) {
paintFillLayers(paintInfo, Color(), style().maskLayers(), paintRect, BackgroundBleedNone, compositeOp);
paintNinePieceImage(paintInfo.context, paintRect, style(), style().maskBoxImage(), compositeOp);
}
if (pushTransparencyLayer)
paintInfo.context->endTransparencyLayer();
}
LayoutRect RenderBox::maskClipRect(const LayoutPoint& paintOffset)
{
const NinePieceImage& maskBoxImage = style().maskBoxImage();
if (maskBoxImage.image()) {
LayoutRect borderImageRect = borderBoxRect();
// Apply outsets to the border box.
borderImageRect.expand(style().maskBoxImageOutsets());
return borderImageRect;
}
LayoutRect result;
LayoutRect borderBox = borderBoxRect();
for (const FillLayer* maskLayer = style().maskLayers(); maskLayer; maskLayer = maskLayer->next()) {
if (maskLayer->maskImage()) {
// Masks should never have fixed attachment, so it's OK for paintContainer to be null.
BackgroundImageGeometry geometry = calculateBackgroundImageGeometry(nullptr, *maskLayer, paintOffset, borderBox);
result.unite(geometry.destRect());
}
}
return result;
}
void RenderBox::paintFillLayers(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, CompositeOperator op, RenderElement* backgroundObject)
{
Vector<const FillLayer*, 8> layers;
const FillLayer* curLayer = fillLayer;
bool shouldDrawBackgroundInSeparateBuffer = false;
while (curLayer) {
layers.append(curLayer);
// Stop traversal when an opaque layer is encountered.
// FIXME : It would be possible for the following occlusion culling test to be more aggressive
// on layers with no repeat by testing whether the image covers the layout rect.
// Testing that here would imply duplicating a lot of calculations that are currently done in
// RenderBoxModelObject::paintFillLayerExtended. A more efficient solution might be to move
// the layer recursion into paintFillLayerExtended, or to compute the layer geometry here
// and pass it down.
if (!shouldDrawBackgroundInSeparateBuffer && curLayer->blendMode() != BlendModeNormal)
shouldDrawBackgroundInSeparateBuffer = true;
// The clipOccludesNextLayers condition must be evaluated first to avoid short-circuiting.
if (curLayer->clipOccludesNextLayers(curLayer == fillLayer) && curLayer->hasOpaqueImage(*this) && curLayer->image()->canRender(this, style().effectiveZoom()) && curLayer->hasRepeatXY() && curLayer->blendMode() == BlendModeNormal)
break;
curLayer = curLayer->next();
}
GraphicsContext* context = paintInfo.context;
if (!context)
shouldDrawBackgroundInSeparateBuffer = false;
BaseBackgroundColorUsage baseBgColorUsage = BaseBackgroundColorUse;
if (shouldDrawBackgroundInSeparateBuffer) {
paintFillLayer(paintInfo, c, *layers.rbegin(), rect, bleedAvoidance, op, backgroundObject, BaseBackgroundColorOnly);
baseBgColorUsage = BaseBackgroundColorSkip;
context->beginTransparencyLayer(1);
}
Vector<const FillLayer*>::const_reverse_iterator topLayer = layers.rend();
for (Vector<const FillLayer*>::const_reverse_iterator it = layers.rbegin(); it != topLayer; ++it)
paintFillLayer(paintInfo, c, *it, rect, bleedAvoidance, op, backgroundObject, baseBgColorUsage);
if (shouldDrawBackgroundInSeparateBuffer)
context->endTransparencyLayer();
}
void RenderBox::paintFillLayer(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, CompositeOperator op, RenderElement* backgroundObject, BaseBackgroundColorUsage baseBgColorUsage)
{
paintFillLayerExtended(paintInfo, c, fillLayer, rect, bleedAvoidance, nullptr, LayoutSize(), op, backgroundObject, baseBgColorUsage);
}
static bool layersUseImage(WrappedImagePtr image, const FillLayer* layers)
{
for (const FillLayer* curLayer = layers; curLayer; curLayer = curLayer->next()) {
if (curLayer->image() && image == curLayer->image()->data())
return true;
}
return false;
}
void RenderBox::imageChanged(WrappedImagePtr image, const IntRect*)
{
if (!parent())
return;
if ((style().borderImage().image() && style().borderImage().image()->data() == image) ||
(style().maskBoxImage().image() && style().maskBoxImage().image()->data() == image)) {
repaint();
return;
}
#if ENABLE(CSS_SHAPES)
ShapeValue* shapeOutsideValue = style().shapeOutside();
if (!view().frameView().isInLayout() && isFloating() && shapeOutsideValue && shapeOutsideValue->image() && shapeOutsideValue->image()->data() == image) {
ShapeOutsideInfo::ensureInfo(*this).markShapeAsDirty();
markShapeOutsideDependentsForLayout();
}
#endif
bool didFullRepaint = repaintLayerRectsForImage(image, style().backgroundLayers(), true);
if (!didFullRepaint)
repaintLayerRectsForImage(image, style().maskLayers(), false);
if (!isComposited())
return;
if (layer()->hasCompositedMask() && layersUseImage(image, style().maskLayers()))
layer()->contentChanged(MaskImageChanged);
if (layersUseImage(image, style().backgroundLayers()))
layer()->contentChanged(BackgroundImageChanged);
}
bool RenderBox::repaintLayerRectsForImage(WrappedImagePtr image, const FillLayer* layers, bool drawingBackground)
{
LayoutRect rendererRect;
RenderBox* layerRenderer = nullptr;
for (const FillLayer* curLayer = layers; curLayer; curLayer = curLayer->next()) {
if (curLayer->image() && image == curLayer->image()->data() && curLayer->image()->canRender(this, style().effectiveZoom())) {
// Now that we know this image is being used, compute the renderer and the rect if we haven't already.
bool drawingRootBackground = drawingBackground && (isRoot() || (isBody() && !document().documentElement()->renderer()->hasBackground()));
if (!layerRenderer) {
if (drawingRootBackground) {
layerRenderer = &view();
LayoutUnit rw = downcast<RenderView>(*layerRenderer).frameView().contentsWidth();
LayoutUnit rh = downcast<RenderView>(*layerRenderer).frameView().contentsHeight();
rendererRect = LayoutRect(-layerRenderer->marginLeft(),
-layerRenderer->marginTop(),
std::max(layerRenderer->width() + layerRenderer->horizontalMarginExtent() + layerRenderer->borderLeft() + layerRenderer->borderRight(), rw),
std::max(layerRenderer->height() + layerRenderer->verticalMarginExtent() + layerRenderer->borderTop() + layerRenderer->borderBottom(), rh));
} else {
layerRenderer = this;
rendererRect = borderBoxRect();
}
}
// FIXME: Figure out how to pass absolute position to calculateBackgroundImageGeometry (for pixel snapping)
BackgroundImageGeometry geometry = layerRenderer->calculateBackgroundImageGeometry(nullptr, *curLayer, LayoutPoint(), rendererRect);
if (geometry.hasNonLocalGeometry()) {
// Rather than incur the costs of computing the paintContainer for renderers with fixed backgrounds
// in order to get the right destRect, just repaint the entire renderer.
layerRenderer->repaint();
return true;
}
LayoutRect rectToRepaint = geometry.destRect();
bool shouldClipToLayer = true;
// If this is the root background layer, we may need to extend the repaintRect if the FrameView has an
// extendedBackground. We should only extend the rect if it is already extending the full width or height
// of the rendererRect.
if (drawingRootBackground && view().frameView().hasExtendedBackgroundRectForPainting()) {
shouldClipToLayer = false;
IntRect extendedBackgroundRect = view().frameView().extendedBackgroundRectForPainting();
if (rectToRepaint.width() == rendererRect.width()) {
rectToRepaint.move(extendedBackgroundRect.x(), 0);
rectToRepaint.setWidth(extendedBackgroundRect.width());
}
if (rectToRepaint.height() == rendererRect.height()) {
rectToRepaint.move(0, extendedBackgroundRect.y());
rectToRepaint.setHeight(extendedBackgroundRect.height());
}
}
layerRenderer->repaintRectangle(rectToRepaint, shouldClipToLayer);
if (geometry.destRect() == rendererRect)
return true;
}
}
return false;
}
bool RenderBox::pushContentsClip(PaintInfo& paintInfo, const LayoutPoint& accumulatedOffset)
{
if (paintInfo.phase == PaintPhaseBlockBackground || paintInfo.phase == PaintPhaseSelfOutline || paintInfo.phase == PaintPhaseMask)
return false;
bool isControlClip = hasControlClip();
bool isOverflowClip = hasOverflowClip() && !layer()->isSelfPaintingLayer();
if (!isControlClip && !isOverflowClip)
return false;
if (paintInfo.phase == PaintPhaseOutline)
paintInfo.phase = PaintPhaseChildOutlines;
else if (paintInfo.phase == PaintPhaseChildBlockBackground) {
paintInfo.phase = PaintPhaseBlockBackground;
paintObject(paintInfo, accumulatedOffset);
paintInfo.phase = PaintPhaseChildBlockBackgrounds;
}
float deviceScaleFactor = document().deviceScaleFactor();
FloatRect clipRect = snapRectToDevicePixels((isControlClip ? controlClipRect(accumulatedOffset) : overflowClipRect(accumulatedOffset, currentRenderNamedFlowFragment(), IgnoreOverlayScrollbarSize, paintInfo.phase)), deviceScaleFactor);
paintInfo.context->save();
if (style().hasBorderRadius())
paintInfo.context->clipRoundedRect(style().getRoundedInnerBorderFor(LayoutRect(accumulatedOffset, size())).pixelSnappedRoundedRectForPainting(deviceScaleFactor));
paintInfo.context->clip(clipRect);
return true;
}
void RenderBox::popContentsClip(PaintInfo& paintInfo, PaintPhase originalPhase, const LayoutPoint& accumulatedOffset)
{
ASSERT(hasControlClip() || (hasOverflowClip() && !layer()->isSelfPaintingLayer()));
paintInfo.context->restore();
if (originalPhase == PaintPhaseOutline) {
paintInfo.phase = PaintPhaseSelfOutline;
paintObject(paintInfo, accumulatedOffset);
paintInfo.phase = originalPhase;
} else if (originalPhase == PaintPhaseChildBlockBackground)
paintInfo.phase = originalPhase;
}
LayoutRect RenderBox::overflowClipRect(const LayoutPoint& location, RenderRegion* region, OverlayScrollbarSizeRelevancy relevancy, PaintPhase)
{
// FIXME: When overflow-clip (CSS3) is implemented, we'll obtain the property
// here.
LayoutRect clipRect = borderBoxRectInRegion(region);
clipRect.setLocation(location + clipRect.location() + LayoutSize(borderLeft(), borderTop()));
clipRect.setSize(clipRect.size() - LayoutSize(borderLeft() + borderRight(), borderTop() + borderBottom()));
// Subtract out scrollbars if we have them.
if (layer()) {
if (style().shouldPlaceBlockDirectionScrollbarOnLogicalLeft())
clipRect.move(layer()->verticalScrollbarWidth(relevancy), 0);
clipRect.contract(layer()->verticalScrollbarWidth(relevancy), layer()->horizontalScrollbarHeight(relevancy));
}
return clipRect;
}
LayoutRect RenderBox::clipRect(const LayoutPoint& location, RenderRegion* region)
{
LayoutRect borderBoxRect = borderBoxRectInRegion(region);
LayoutRect clipRect = LayoutRect(borderBoxRect.location() + location, borderBoxRect.size());
if (!style().clipLeft().isAuto()) {
LayoutUnit c = valueForLength(style().clipLeft(), borderBoxRect.width());
clipRect.move(c, 0);
clipRect.contract(c, 0);
}
// We don't use the region-specific border box's width and height since clip offsets are (stupidly) specified
// from the left and top edges. Therefore it's better to avoid constraining to smaller widths and heights.
if (!style().clipRight().isAuto())
clipRect.contract(width() - valueForLength(style().clipRight(), width()), 0);
if (!style().clipTop().isAuto()) {
LayoutUnit c = valueForLength(style().clipTop(), borderBoxRect.height());
clipRect.move(0, c);
clipRect.contract(0, c);
}
if (!style().clipBottom().isAuto())
clipRect.contract(0, height() - valueForLength(style().clipBottom(), height()));
return clipRect;
}
LayoutUnit RenderBox::shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const RenderBlock* cb, RenderRegion* region) const
{
RenderRegion* containingBlockRegion = nullptr;
LayoutUnit logicalTopPosition = logicalTop();
if (region) {
LayoutUnit offsetFromLogicalTopOfRegion = region ? region->logicalTopForFlowThreadContent() - offsetFromLogicalTopOfFirstPage() : LayoutUnit();
logicalTopPosition = std::max(logicalTopPosition, logicalTopPosition + offsetFromLogicalTopOfRegion);
containingBlockRegion = cb->clampToStartAndEndRegions(region);
}
LayoutUnit logicalHeight = cb->logicalHeightForChild(*this);
LayoutUnit result = cb->availableLogicalWidthForLineInRegion(logicalTopPosition, false, containingBlockRegion, logicalHeight) - childMarginStart - childMarginEnd;
// We need to see if margins on either the start side or the end side can contain the floats in question. If they can,
// then just using the line width is inaccurate. In the case where a float completely fits, we don't need to use the line
// offset at all, but can instead push all the way to the content edge of the containing block. In the case where the float
// doesn't fit, we can use the line offset, but we need to grow it by the margin to reflect the fact that the margin was
// "consumed" by the float. Negative margins aren't consumed by the float, and so we ignore them.
if (childMarginStart > 0) {
LayoutUnit startContentSide = cb->startOffsetForContent(containingBlockRegion);
LayoutUnit startContentSideWithMargin = startContentSide + childMarginStart;
LayoutUnit startOffset = cb->startOffsetForLineInRegion(logicalTopPosition, false, containingBlockRegion, logicalHeight);
if (startOffset > startContentSideWithMargin)
result += childMarginStart;
else
result += startOffset - startContentSide;
}
if (childMarginEnd > 0) {
LayoutUnit endContentSide = cb->endOffsetForContent(containingBlockRegion);
LayoutUnit endContentSideWithMargin = endContentSide + childMarginEnd;
LayoutUnit endOffset = cb->endOffsetForLineInRegion(logicalTopPosition, false, containingBlockRegion, logicalHeight);
if (endOffset > endContentSideWithMargin)
result += childMarginEnd;
else
result += endOffset - endContentSide;
}
return result;
}
LayoutUnit RenderBox::containingBlockLogicalWidthForContent() const
{
#if ENABLE(CSS_GRID_LAYOUT)
if (hasOverrideContainingBlockLogicalWidth())
return overrideContainingBlockContentLogicalWidth();
#endif
RenderBlock* cb = containingBlock();
if (!cb)
return LayoutUnit();
return cb->availableLogicalWidth();
}
LayoutUnit RenderBox::containingBlockLogicalHeightForContent(AvailableLogicalHeightType heightType) const
{
#if ENABLE(CSS_GRID_LAYOUT)
if (hasOverrideContainingBlockLogicalHeight())
return overrideContainingBlockContentLogicalHeight();
#endif
RenderBlock* cb = containingBlock();
if (!cb)
return LayoutUnit();
return cb->availableLogicalHeight(heightType);
}
LayoutUnit RenderBox::containingBlockLogicalWidthForContentInRegion(RenderRegion* region) const
{
if (!region)
return containingBlockLogicalWidthForContent();
RenderBlock* cb = containingBlock();
RenderRegion* containingBlockRegion = cb->clampToStartAndEndRegions(region);
// FIXME: It's unclear if a region's content should use the containing block's override logical width.
// If it should, the following line should call containingBlockLogicalWidthForContent.
LayoutUnit result = cb->availableLogicalWidth();
RenderBoxRegionInfo* boxInfo = cb->renderBoxRegionInfo(containingBlockRegion);
if (!boxInfo)
return result;
return std::max<LayoutUnit>(0, result - (cb->logicalWidth() - boxInfo->logicalWidth()));
}
LayoutUnit RenderBox::containingBlockAvailableLineWidthInRegion(RenderRegion* region) const
{
RenderBlock* cb = containingBlock();
RenderRegion* containingBlockRegion = nullptr;
LayoutUnit logicalTopPosition = logicalTop();
if (region) {
LayoutUnit offsetFromLogicalTopOfRegion = region ? region->logicalTopForFlowThreadContent() - offsetFromLogicalTopOfFirstPage() : LayoutUnit();
logicalTopPosition = std::max(logicalTopPosition, logicalTopPosition + offsetFromLogicalTopOfRegion);
containingBlockRegion = cb->clampToStartAndEndRegions(region);
}
return cb->availableLogicalWidthForLineInRegion(logicalTopPosition, false, containingBlockRegion, availableLogicalHeight(IncludeMarginBorderPadding));
}
LayoutUnit RenderBox::perpendicularContainingBlockLogicalHeight() const
{
#if ENABLE(CSS_GRID_LAYOUT)
if (hasOverrideContainingBlockLogicalHeight())
return overrideContainingBlockContentLogicalHeight();
#endif
RenderBlock* cb = containingBlock();
if (cb->hasOverrideLogicalContentHeight())
return cb->overrideLogicalContentHeight();
const RenderStyle& containingBlockStyle = cb->style();
Length logicalHeightLength = containingBlockStyle.logicalHeight();
// FIXME: For now just support fixed heights. Eventually should support percentage heights as well.
if (!logicalHeightLength.isFixed()) {
LayoutUnit fillFallbackExtent = containingBlockStyle.isHorizontalWritingMode() ? view().frameView().visibleHeight() : view().frameView().visibleWidth();
LayoutUnit fillAvailableExtent = containingBlock()->availableLogicalHeight(ExcludeMarginBorderPadding);
return std::min(fillAvailableExtent, fillFallbackExtent);
}
// Use the content box logical height as specified by the style.
return cb->adjustContentBoxLogicalHeightForBoxSizing(logicalHeightLength.value());
}
void RenderBox::mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFixed) const
{
if (repaintContainer == this)
return;
if (view().layoutStateEnabled() && !repaintContainer) {
LayoutState* layoutState = view().layoutState();
LayoutSize offset = layoutState->m_paintOffset + locationOffset();
if (style().hasInFlowPosition() && layer())
offset += layer()->offsetForInFlowPosition();
transformState.move(offset);
return;
}
bool containerSkipped;
RenderElement* container = this->container(repaintContainer, &containerSkipped);
if (!container)
return;
bool isFixedPos = style().position() == FixedPosition;
// If this box has a transform, it acts as a fixed position container for fixed descendants,
// and may itself also be fixed position. So propagate 'fixed' up only if this box is fixed position.
if (hasTransform() && !isFixedPos)
mode &= ~IsFixed;
else if (isFixedPos)
mode |= IsFixed;
if (wasFixed)
*wasFixed = mode & IsFixed;
LayoutSize containerOffset = offsetFromContainer(*container, LayoutPoint(transformState.mappedPoint()));
bool preserve3D = mode & UseTransforms && (container->style().preserves3D() || style().preserves3D());
if (mode & UseTransforms && shouldUseTransformFromContainer(container)) {
TransformationMatrix t;
getTransformFromContainer(container, containerOffset, t);
transformState.applyTransform(t, preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
} else
transformState.move(containerOffset.width(), containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
if (containerSkipped) {
// There can't be a transform between repaintContainer and o, because transforms create containers, so it should be safe
// to just subtract the delta between the repaintContainer and o.
LayoutSize containerOffset = repaintContainer->offsetFromAncestorContainer(*container);
transformState.move(-containerOffset.width(), -containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
return;
}
mode &= ~ApplyContainerFlip;
// For fixed positioned elements inside out-of-flow named flows, we do not want to
// map their position further to regions based on their coordinates inside the named flows.
if (!container->isOutOfFlowRenderFlowThread() || !fixedPositionedWithNamedFlowContainingBlock())
container->mapLocalToContainer(repaintContainer, transformState, mode, wasFixed);
else
container->mapLocalToContainer(downcast<RenderLayerModelObject>(container), transformState, mode, wasFixed);
}
const RenderObject* RenderBox::pushMappingToContainer(const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap& geometryMap) const
{
ASSERT(ancestorToStopAt != this);
bool ancestorSkipped;
RenderElement* container = this->container(ancestorToStopAt, &ancestorSkipped);
if (!container)
return nullptr;
bool isFixedPos = style().position() == FixedPosition;
LayoutSize adjustmentForSkippedAncestor;
if (ancestorSkipped) {
// There can't be a transform between repaintContainer and container, because transforms create containers, so it should be safe
// to just subtract the delta between the ancestor and container.
adjustmentForSkippedAncestor = -ancestorToStopAt->offsetFromAncestorContainer(*container);
}
bool offsetDependsOnPoint = false;
LayoutSize containerOffset = offsetFromContainer(*container, LayoutPoint(), &offsetDependsOnPoint);
bool preserve3D = container->style().preserves3D() || style().preserves3D();
if (shouldUseTransformFromContainer(container) && (geometryMap.mapCoordinatesFlags() & UseTransforms)) {
TransformationMatrix t;
getTransformFromContainer(container, containerOffset, t);
t.translateRight(adjustmentForSkippedAncestor.width(), adjustmentForSkippedAncestor.height());
geometryMap.push(this, t, preserve3D, offsetDependsOnPoint, isFixedPos, hasTransform());
} else {
containerOffset += adjustmentForSkippedAncestor;
geometryMap.push(this, containerOffset, preserve3D, offsetDependsOnPoint, isFixedPos, hasTransform());
}
return ancestorSkipped ? ancestorToStopAt : container;
}
void RenderBox::mapAbsoluteToLocalPoint(MapCoordinatesFlags mode, TransformState& transformState) const
{
bool isFixedPos = style().position() == FixedPosition;
if (hasTransform() && !isFixedPos) {
// If this box has a transform, it acts as a fixed position container for fixed descendants,
// and may itself also be fixed position. So propagate 'fixed' up only if this box is fixed position.
mode &= ~IsFixed;
} else if (isFixedPos)
mode |= IsFixed;
RenderBoxModelObject::mapAbsoluteToLocalPoint(mode, transformState);
}
LayoutSize RenderBox::offsetFromContainer(RenderElement& renderer, const LayoutPoint&, bool* offsetDependsOnPoint) const
{
// A region "has" boxes inside it without being their container.
ASSERT(&renderer == container() || is<RenderRegion>(renderer));
LayoutSize offset;
if (isInFlowPositioned())
offset += offsetForInFlowPosition();
if (!isInline() || isReplaced())
offset += topLeftLocationOffset();
if (is<RenderBox>(renderer))
offset -= downcast<RenderBox>(renderer).scrolledContentOffset();
if (style().position() == AbsolutePosition && renderer.isInFlowPositioned() && is<RenderInline>(renderer))
offset += downcast<RenderInline>(renderer).offsetForInFlowPositionedInline(this);
if (offsetDependsOnPoint)
*offsetDependsOnPoint |= is<RenderFlowThread>(renderer);
return offset;
}
std::unique_ptr<InlineElementBox> RenderBox::createInlineBox()
{
return std::make_unique<InlineElementBox>(*this);
}
void RenderBox::dirtyLineBoxes(bool fullLayout)
{
if (m_inlineBoxWrapper) {
if (fullLayout) {
delete m_inlineBoxWrapper;
m_inlineBoxWrapper = nullptr;
} else
m_inlineBoxWrapper->dirtyLineBoxes();
}
}
void RenderBox::positionLineBox(InlineElementBox& box)
{
if (isOutOfFlowPositioned()) {
// Cache the x position only if we were an INLINE type originally.
bool wasInline = style().isOriginalDisplayInlineType();
if (wasInline) {
// The value is cached in the xPos of the box. We only need this value if
// our object was inline originally, since otherwise it would have ended up underneath
// the inlines.
RootInlineBox& rootBox = box.root();
rootBox.blockFlow().setStaticInlinePositionForChild(*this, rootBox.lineTopWithLeading(), LayoutUnit::fromFloatRound(box.logicalLeft()));
if (style().hasStaticInlinePosition(box.isHorizontal()))
setChildNeedsLayout(MarkOnlyThis); // Just mark the positioned object as needing layout, so it will update its position properly.
} else {
// Our object was a block originally, so we make our normal flow position be
// just below the line box (as though all the inlines that came before us got
// wrapped in an anonymous block, which is what would have happened had we been
// in flow). This value was cached in the y() of the box.
layer()->setStaticBlockPosition(box.logicalTop());
if (style().hasStaticBlockPosition(box.isHorizontal()))
setChildNeedsLayout(MarkOnlyThis); // Just mark the positioned object as needing layout, so it will update its position properly.
}
// Nuke the box.
box.removeFromParent();
delete &box;
return;
}
if (isReplaced()) {
setLocation(LayoutPoint(box.topLeft()));
setInlineBoxWrapper(&box);
}
}
void RenderBox::deleteLineBoxWrapper()
{
if (m_inlineBoxWrapper) {
if (!documentBeingDestroyed())
m_inlineBoxWrapper->removeFromParent();
delete m_inlineBoxWrapper;
m_inlineBoxWrapper = nullptr;
}
}
LayoutRect RenderBox::clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const
{
if (style().visibility() != VISIBLE && !enclosingLayer()->hasVisibleContent())
return LayoutRect();
LayoutRect r = visualOverflowRect();
// FIXME: layoutDelta needs to be applied in parts before/after transforms and
// repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
r.move(view().layoutDelta());
// We have to use maximalOutlineSize() because a child might have an outline
// that projects outside of our overflowRect.
ASSERT(style().outlineSize() <= view().maximalOutlineSize());
r.inflate(view().maximalOutlineSize());
computeRectForRepaint(repaintContainer, r);
return r;
}
static inline bool shouldApplyContainersClipAndOffset(const RenderLayerModelObject* repaintContainer, RenderBox* containerBox)
{
#if PLATFORM(IOS)
if (!repaintContainer || repaintContainer != containerBox)
return true;
return !containerBox->hasLayer() || !containerBox->layer()->usesCompositedScrolling();
#else
UNUSED_PARAM(repaintContainer);
UNUSED_PARAM(containerBox);
return true;
#endif
}
void RenderBox::computeRectForRepaint(const RenderLayerModelObject* repaintContainer, LayoutRect& rect, bool fixed) const
{
// The rect we compute at each step is shifted by our x/y offset in the parent container's coordinate space.
// Only when we cross a writing mode boundary will we have to possibly flipForWritingMode (to convert into a more appropriate
// offset corner for the enclosing container). This allows for a fully RL or BT document to repaint
// properly even during layout, since the rect remains flipped all the way until the end.
//
// RenderView::computeRectForRepaint then converts the rect to physical coordinates. We also convert to
// physical when we hit a repaintContainer boundary. Therefore the final rect returned is always in the
// physical coordinate space of the repaintContainer.
const RenderStyle& styleToUse = style();
// LayoutState is only valid for root-relative, non-fixed position repainting
if (view().layoutStateEnabled() && !repaintContainer && styleToUse.position() != FixedPosition) {
LayoutState* layoutState = view().layoutState();
if (layer() && layer()->transform())
rect = LayoutRect(encloseRectToDevicePixels(layer()->transform()->mapRect(rect), document().deviceScaleFactor()));
// We can't trust the bits on RenderObject, because this might be called while re-resolving style.
if (styleToUse.hasInFlowPosition() && layer())
rect.move(layer()->offsetForInFlowPosition());
rect.moveBy(location());
rect.move(layoutState->m_paintOffset);
if (layoutState->m_clipped)
rect.intersect(layoutState->m_clipRect);
return;
}
if (hasReflection())
rect.unite(reflectedRect(rect));
if (repaintContainer == this) {
if (repaintContainer->style().isFlippedBlocksWritingMode())
flipForWritingMode(rect);
return;
}
bool containerSkipped;
auto* renderer = container(repaintContainer, &containerSkipped);
if (!renderer)
return;
EPosition position = styleToUse.position();
// This code isn't necessary for in-flow RenderFlowThreads.
// Don't add the location of the region in the flow thread for absolute positioned
// elements because their absolute position already pushes them down through
// the regions so adding this here and then adding the topLeft again would cause
// us to add the height twice.
// The same logic applies for elements flowed directly into the flow thread. Their topLeft member
// will already contain the portion rect of the region.
if (renderer->isOutOfFlowRenderFlowThread() && position != AbsolutePosition && containingBlock() != flowThreadContainingBlock()) {
RenderRegion* firstRegion = nullptr;
RenderRegion* lastRegion = nullptr;
if (downcast<RenderFlowThread>(*renderer).getRegionRangeForBox(this, firstRegion, lastRegion))
rect.moveBy(firstRegion->flowThreadPortionRect().location());
}
if (isWritingModeRoot() && !isOutOfFlowPositioned())
flipForWritingMode(rect);
LayoutSize locationOffset = this->locationOffset();
// FIXME: This is needed as long as RenderWidget snaps to integral size/position.
if (isRenderReplaced() && isWidget())
locationOffset = toIntSize(flooredIntPoint(locationOffset));
LayoutPoint topLeft = rect.location();
topLeft.move(locationOffset);
// We are now in our parent container's coordinate space. Apply our transform to obtain a bounding box
// in the parent's coordinate space that encloses us.
if (hasLayer() && layer()->transform()) {
fixed = position == FixedPosition;
rect = LayoutRect(encloseRectToDevicePixels(layer()->transform()->mapRect(rect), document().deviceScaleFactor()));
topLeft = rect.location();
topLeft.move(locationOffset);
} else if (position == FixedPosition)
fixed = true;
if (position == AbsolutePosition && renderer->isInFlowPositioned() && is<RenderInline>(*renderer))
topLeft += downcast<RenderInline>(*renderer).offsetForInFlowPositionedInline(this);
else if (styleToUse.hasInFlowPosition() && layer()) {
// Apply the relative position offset when invalidating a rectangle. The layer
// is translated, but the render box isn't, so we need to do this to get the
// right dirty rect. Since this is called from RenderObject::setStyle, the relative position
// flag on the RenderObject has been cleared, so use the one on the style().
topLeft += layer()->offsetForInFlowPosition();
}
// FIXME: We ignore the lightweight clipping rect that controls use, since if |o| is in mid-layout,
// its controlClipRect will be wrong. For overflow clip we use the values cached by the layer.
rect.setLocation(topLeft);
if (renderer->hasOverflowClip()) {
RenderBox& containerBox = downcast<RenderBox>(*renderer);
if (shouldApplyContainersClipAndOffset(repaintContainer, &containerBox)) {
containerBox.applyCachedClipAndScrollOffsetForRepaint(rect);
if (rect.isEmpty())
return;
}
}
if (containerSkipped) {
// If the repaintContainer is below o, then we need to map the rect into repaintContainer's coordinates.
LayoutSize containerOffset = repaintContainer->offsetFromAncestorContainer(*renderer);
rect.move(-containerOffset);
return;
}
renderer->computeRectForRepaint(repaintContainer, rect, fixed);
}
void RenderBox::repaintDuringLayoutIfMoved(const LayoutRect& oldRect)
{
if (oldRect.location() != m_frameRect.location()) {
LayoutRect newRect = m_frameRect;
// The child moved. Invalidate the object's old and new positions. We have to do this
// since the object may not have gotten a layout.
m_frameRect = oldRect;
repaint();
repaintOverhangingFloats(true);
m_frameRect = newRect;
repaint();
repaintOverhangingFloats(true);
}
}
void RenderBox::repaintOverhangingFloats(bool)
{
}
void RenderBox::updateLogicalWidth()
{
LogicalExtentComputedValues computedValues;
computeLogicalWidthInRegion(computedValues);
setLogicalWidth(computedValues.m_extent);
setLogicalLeft(computedValues.m_position);
setMarginStart(computedValues.m_margins.m_start);
setMarginEnd(computedValues.m_margins.m_end);
}
void RenderBox::computeLogicalWidthInRegion(LogicalExtentComputedValues& computedValues, RenderRegion* region) const
{
computedValues.m_extent = logicalWidth();
computedValues.m_position = logicalLeft();
computedValues.m_margins.m_start = marginStart();
computedValues.m_margins.m_end = marginEnd();
if (isOutOfFlowPositioned()) {
// FIXME: This calculation is not patched for block-flow yet.
// https://bugs.webkit.org/show_bug.cgi?id=46500
computePositionedLogicalWidth(computedValues, region);
return;
}
// If layout is limited to a subtree, the subtree root's logical width does not change.
if (element() && view().frameView().layoutRoot(true) == this)
return;
// The parent box is flexing us, so it has increased or decreased our
// width. Use the width from the style context.
// FIXME: Account for block-flow in flexible boxes.
// https://bugs.webkit.org/show_bug.cgi?id=46418
if (hasOverrideLogicalContentWidth() && (isRubyRun() || style().borderFit() == BorderFitLines || parent()->isFlexibleBoxIncludingDeprecated())) {
computedValues.m_extent = overrideLogicalContentWidth() + borderAndPaddingLogicalWidth();
return;
}
// FIXME: Account for block-flow in flexible boxes.
// https://bugs.webkit.org/show_bug.cgi?id=46418
bool inVerticalBox = parent()->isDeprecatedFlexibleBox() && (parent()->style().boxOrient() == VERTICAL);
bool stretching = (parent()->style().boxAlign() == BSTRETCH);
bool treatAsReplaced = shouldComputeSizeAsReplaced() && (!inVerticalBox || !stretching);
const RenderStyle& styleToUse = style();
Length logicalWidthLength = treatAsReplaced ? Length(computeReplacedLogicalWidth(), Fixed) : styleToUse.logicalWidth();
RenderBlock* cb = containingBlock();
LayoutUnit containerLogicalWidth = std::max<LayoutUnit>(0, containingBlockLogicalWidthForContentInRegion(region));
bool hasPerpendicularContainingBlock = cb->isHorizontalWritingMode() != isHorizontalWritingMode();
if (isInline() && !isInlineBlockOrInlineTable()) {
// just calculate margins
computedValues.m_margins.m_start = minimumValueForLength(styleToUse.marginStart(), containerLogicalWidth);
computedValues.m_margins.m_end = minimumValueForLength(styleToUse.marginEnd(), containerLogicalWidth);
if (treatAsReplaced)
computedValues.m_extent = std::max<LayoutUnit>(floatValueForLength(logicalWidthLength, 0) + borderAndPaddingLogicalWidth(), minPreferredLogicalWidth());
return;
}
// Width calculations
if (treatAsReplaced)
computedValues.m_extent = logicalWidthLength.value() + borderAndPaddingLogicalWidth();
else {
LayoutUnit containerWidthInInlineDirection = containerLogicalWidth;
if (hasPerpendicularContainingBlock)
containerWidthInInlineDirection = perpendicularContainingBlockLogicalHeight();
LayoutUnit preferredWidth = computeLogicalWidthInRegionUsing(MainOrPreferredSize, styleToUse.logicalWidth(), containerWidthInInlineDirection, cb, region);
computedValues.m_extent = constrainLogicalWidthInRegionByMinMax(preferredWidth, containerWidthInInlineDirection, cb, region);
}
// Margin calculations.
if (hasPerpendicularContainingBlock || isFloating() || isInline()) {
computedValues.m_margins.m_start = minimumValueForLength(styleToUse.marginStart(), containerLogicalWidth);
computedValues.m_margins.m_end = minimumValueForLength(styleToUse.marginEnd(), containerLogicalWidth);
} else {
LayoutUnit containerLogicalWidthForAutoMargins = containerLogicalWidth;
if (avoidsFloats() && cb->containsFloats())
containerLogicalWidthForAutoMargins = containingBlockAvailableLineWidthInRegion(region);
bool hasInvertedDirection = cb->style().isLeftToRightDirection() != style().isLeftToRightDirection();
computeInlineDirectionMargins(cb, containerLogicalWidthForAutoMargins, computedValues.m_extent,
hasInvertedDirection ? computedValues.m_margins.m_end : computedValues.m_margins.m_start,
hasInvertedDirection ? computedValues.m_margins.m_start : computedValues.m_margins.m_end);
}
if (!hasPerpendicularContainingBlock && containerLogicalWidth && containerLogicalWidth != (computedValues.m_extent + computedValues.m_margins.m_start + computedValues.m_margins.m_end)
&& !isFloating() && !isInline() && !cb->isFlexibleBoxIncludingDeprecated()
#if ENABLE(CSS_GRID_LAYOUT)
&& !cb->isRenderGrid()
#endif
) {
LayoutUnit newMargin = containerLogicalWidth - computedValues.m_extent - cb->marginStartForChild(*this);
bool hasInvertedDirection = cb->style().isLeftToRightDirection() != style().isLeftToRightDirection();
if (hasInvertedDirection)
computedValues.m_margins.m_start = newMargin;
else
computedValues.m_margins.m_end = newMargin;
}
}
LayoutUnit RenderBox::fillAvailableMeasure(LayoutUnit availableLogicalWidth) const
{
LayoutUnit marginStart = 0;
LayoutUnit marginEnd = 0;
return fillAvailableMeasure(availableLogicalWidth, marginStart, marginEnd);
}
LayoutUnit RenderBox::fillAvailableMeasure(LayoutUnit availableLogicalWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const
{
marginStart = minimumValueForLength(style().marginStart(), availableLogicalWidth);
marginEnd = minimumValueForLength(style().marginEnd(), availableLogicalWidth);
return availableLogicalWidth - marginStart - marginEnd;
}
LayoutUnit RenderBox::computeIntrinsicLogicalWidthUsing(Length logicalWidthLength, LayoutUnit availableLogicalWidth, LayoutUnit borderAndPadding) const
{
if (logicalWidthLength.type() == FillAvailable)
return fillAvailableMeasure(availableLogicalWidth);
LayoutUnit minLogicalWidth = 0;
LayoutUnit maxLogicalWidth = 0;
computeIntrinsicLogicalWidths(minLogicalWidth, maxLogicalWidth);
if (logicalWidthLength.type() == MinContent)
return minLogicalWidth + borderAndPadding;
if (logicalWidthLength.type() == MaxContent)
return maxLogicalWidth + borderAndPadding;
if (logicalWidthLength.type() == FitContent) {
minLogicalWidth += borderAndPadding;
maxLogicalWidth += borderAndPadding;
return std::max(minLogicalWidth, std::min(maxLogicalWidth, fillAvailableMeasure(availableLogicalWidth)));
}
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit RenderBox::computeLogicalWidthInRegionUsing(SizeType widthType, Length logicalWidth, LayoutUnit availableLogicalWidth,
const RenderBlock* cb, RenderRegion* region) const
{
if (!logicalWidth.isIntrinsicOrAuto()) {
// FIXME: If the containing block flow is perpendicular to our direction we need to use the available logical height instead.
return adjustBorderBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, availableLogicalWidth));
}
if (logicalWidth.isIntrinsic())
return computeIntrinsicLogicalWidthUsing(logicalWidth, availableLogicalWidth, borderAndPaddingLogicalWidth());
LayoutUnit marginStart = 0;
LayoutUnit marginEnd = 0;
LayoutUnit logicalWidthResult = fillAvailableMeasure(availableLogicalWidth, marginStart, marginEnd);
if (shrinkToAvoidFloats() && cb->containsFloats())
logicalWidthResult = std::min(logicalWidthResult, shrinkLogicalWidthToAvoidFloats(marginStart, marginEnd, cb, region));
if (widthType == MainOrPreferredSize && sizesLogicalWidthToFitContent(widthType))
return std::max(minPreferredLogicalWidth(), std::min(maxPreferredLogicalWidth(), logicalWidthResult));
return logicalWidthResult;
}
static bool flexItemHasStretchAlignment(const RenderBox& flexitem)
{
auto parent = flexitem.parent();
return RenderStyle::resolveAlignment(parent->style(), flexitem.style(), ItemPositionStretch) == ItemPositionStretch;
}
static bool isStretchingColumnFlexItem(const RenderBox& flexitem)
{
auto parent = flexitem.parent();
if (parent->isDeprecatedFlexibleBox() && parent->style().boxOrient() == VERTICAL && parent->style().boxAlign() == BSTRETCH)
return true;
// We don't stretch multiline flexboxes because they need to apply line spacing (align-content) first.
if (parent->isFlexibleBox() && parent->style().flexWrap() == FlexNoWrap && parent->style().isColumnFlexDirection() && flexItemHasStretchAlignment(flexitem))
return true;
return false;
}
bool RenderBox::sizesLogicalWidthToFitContent(SizeType widthType) const
{
// Anonymous inline blocks always fill the width of their containing block.
if (isAnonymousInlineBlock())
return false;
// Marquees in WinIE are like a mixture of blocks and inline-blocks. They size as though they're blocks,
// but they allow text to sit on the same line as the marquee.
if (isFloating() || (isInlineBlockOrInlineTable() && !isHTMLMarquee()))
return true;
// This code may look a bit strange. Basically width:intrinsic should clamp the size when testing both
// min-width and width. max-width is only clamped if it is also intrinsic.
Length logicalWidth = (widthType == MaxSize) ? style().logicalMaxWidth() : style().logicalWidth();
if (logicalWidth.type() == Intrinsic)
return true;
// Children of a horizontal marquee do not fill the container by default.
// FIXME: Need to deal with MAUTO value properly. It could be vertical.
// FIXME: Think about block-flow here. Need to find out how marquee direction relates to
// block-flow (as well as how marquee overflow should relate to block flow).
// https://bugs.webkit.org/show_bug.cgi?id=46472
if (parent()->style().overflowX() == OMARQUEE) {
EMarqueeDirection dir = parent()->style().marqueeDirection();
if (dir == MAUTO || dir == MFORWARD || dir == MBACKWARD || dir == MLEFT || dir == MRIGHT)
return true;
}
// Flexible box items should shrink wrap, so we lay them out at their intrinsic widths.
// In the case of columns that have a stretch alignment, we layout at the stretched size
// to avoid an extra layout when applying alignment.
if (parent()->isFlexibleBox()) {
// For multiline columns, we need to apply align-content first, so we can't stretch now.
if (!parent()->style().isColumnFlexDirection() || parent()->style().flexWrap() != FlexNoWrap)
return true;
if (!flexItemHasStretchAlignment(*this))
return true;
}
// Flexible horizontal boxes lay out children at their intrinsic widths. Also vertical boxes
// that don't stretch their kids lay out their children at their intrinsic widths.
// FIXME: Think about block-flow here.
// https://bugs.webkit.org/show_bug.cgi?id=46473
if (parent()->isDeprecatedFlexibleBox() && (parent()->style().boxOrient() == HORIZONTAL || parent()->style().boxAlign() != BSTRETCH))
return true;
// Button, input, select, textarea, and legend treat width value of 'auto' as 'intrinsic' unless it's in a
// stretching column flexbox.
// FIXME: Think about block-flow here.
// https://bugs.webkit.org/show_bug.cgi?id=46473
if (logicalWidth.type() == Auto && !isStretchingColumnFlexItem(*this) && element() && (is<HTMLInputElement>(*element()) || is<HTMLSelectElement>(*element()) || is<HTMLButtonElement>(*element()) || is<HTMLTextAreaElement>(*element()) || is<HTMLLegendElement>(*element())))
return true;
if (isHorizontalWritingMode() != containingBlock()->isHorizontalWritingMode())
return true;
return false;
}
void RenderBox::computeInlineDirectionMargins(RenderBlock* containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const
{
const RenderStyle& containingBlockStyle = containingBlock->style();
Length marginStartLength = style().marginStartUsing(&containingBlockStyle);
Length marginEndLength = style().marginEndUsing(&containingBlockStyle);
if (isFloating() || isInline()) {
// Inline blocks/tables and floats don't have their margins increased.
marginStart = minimumValueForLength(marginStartLength, containerWidth);
marginEnd = minimumValueForLength(marginEndLength, containerWidth);
return;
}
// Case One: The object is being centered in the containing block's available logical width.
if ((marginStartLength.isAuto() && marginEndLength.isAuto() && childWidth < containerWidth)
|| (!marginStartLength.isAuto() && !marginEndLength.isAuto() && containingBlock->style().textAlign() == WEBKIT_CENTER)) {
// Other browsers center the margin box for align=center elements so we match them here.
LayoutUnit marginStartWidth = minimumValueForLength(marginStartLength, containerWidth);
LayoutUnit marginEndWidth = minimumValueForLength(marginEndLength, containerWidth);
LayoutUnit centeredMarginBoxStart = std::max<LayoutUnit>(0, (containerWidth - childWidth - marginStartWidth - marginEndWidth) / 2);
marginStart = centeredMarginBoxStart + marginStartWidth;
marginEnd = containerWidth - childWidth - marginStart + marginEndWidth;
return;
}
// Case Two: The object is being pushed to the start of the containing block's available logical width.
if (marginEndLength.isAuto() && childWidth < containerWidth) {
marginStart = valueForLength(marginStartLength, containerWidth);
marginEnd = containerWidth - childWidth - marginStart;
return;
}
// Case Three: The object is being pushed to the end of the containing block's available logical width.
bool pushToEndFromTextAlign = !marginEndLength.isAuto() && ((!containingBlockStyle.isLeftToRightDirection() && containingBlockStyle.textAlign() == WEBKIT_LEFT)
|| (containingBlockStyle.isLeftToRightDirection() && containingBlockStyle.textAlign() == WEBKIT_RIGHT));
if ((marginStartLength.isAuto() && childWidth < containerWidth) || pushToEndFromTextAlign) {
marginEnd = valueForLength(marginEndLength, containerWidth);
marginStart = containerWidth - childWidth - marginEnd;
return;
}
// Case Four: Either no auto margins, or our width is >= the container width (css2.1, 10.3.3). In that case
// auto margins will just turn into 0.
marginStart = minimumValueForLength(marginStartLength, containerWidth);
marginEnd = minimumValueForLength(marginEndLength, containerWidth);
}
RenderBoxRegionInfo* RenderBox::renderBoxRegionInfo(RenderRegion* region, RenderBoxRegionInfoFlags cacheFlag) const
{
// Make sure nobody is trying to call this with a null region.
if (!region)
return nullptr;
// If we have computed our width in this region already, it will be cached, and we can
// just return it.
RenderBoxRegionInfo* boxInfo = region->renderBoxRegionInfo(this);
if (boxInfo && cacheFlag == CacheRenderBoxRegionInfo)
return boxInfo;
// No cached value was found, so we have to compute our insets in this region.
// FIXME: For now we limit this computation to normal RenderBlocks. Future patches will expand
// support to cover all boxes.
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (isRenderFlowThread() || !flowThread || !canHaveBoxInfoInRegion() || flowThread->style().writingMode() != style().writingMode())
return nullptr;
LogicalExtentComputedValues computedValues;
computeLogicalWidthInRegion(computedValues, region);
// Now determine the insets based off where this object is supposed to be positioned.
RenderBlock* cb = containingBlock();
RenderRegion* clampedContainingBlockRegion = cb->clampToStartAndEndRegions(region);
RenderBoxRegionInfo* containingBlockInfo = cb->renderBoxRegionInfo(clampedContainingBlockRegion);
LayoutUnit containingBlockLogicalWidth = cb->logicalWidth();
LayoutUnit containingBlockLogicalWidthInRegion = containingBlockInfo ? containingBlockInfo->logicalWidth() : containingBlockLogicalWidth;
LayoutUnit marginStartInRegion = computedValues.m_margins.m_start;
LayoutUnit startMarginDelta = marginStartInRegion - marginStart();
LayoutUnit logicalWidthInRegion = computedValues.m_extent;
LayoutUnit logicalLeftInRegion = computedValues.m_position;
LayoutUnit widthDelta = logicalWidthInRegion - logicalWidth();
LayoutUnit logicalLeftDelta = isOutOfFlowPositioned() ? logicalLeftInRegion - logicalLeft() : startMarginDelta;
LayoutUnit logicalRightInRegion = containingBlockLogicalWidthInRegion - (logicalLeftInRegion + logicalWidthInRegion);
LayoutUnit oldLogicalRight = containingBlockLogicalWidth - (logicalLeft() + logicalWidth());
LayoutUnit logicalRightDelta = isOutOfFlowPositioned() ? logicalRightInRegion - oldLogicalRight : startMarginDelta;
LayoutUnit logicalLeftOffset = 0;
if (!isOutOfFlowPositioned() && avoidsFloats() && cb->containsFloats()) {
LayoutUnit startPositionDelta = cb->computeStartPositionDeltaForChildAvoidingFloats(*this, marginStartInRegion, region);
if (cb->style().isLeftToRightDirection())
logicalLeftDelta += startPositionDelta;
else
logicalRightDelta += startPositionDelta;
}
if (cb->style().isLeftToRightDirection())
logicalLeftOffset += logicalLeftDelta;
else
logicalLeftOffset -= (widthDelta + logicalRightDelta);
LayoutUnit logicalRightOffset = logicalWidth() - (logicalLeftOffset + logicalWidthInRegion);
bool isShifted = (containingBlockInfo && containingBlockInfo->isShifted())
|| (style().isLeftToRightDirection() && logicalLeftOffset)
|| (!style().isLeftToRightDirection() && logicalRightOffset);
// FIXME: Although it's unlikely, these boxes can go outside our bounds, and so we will need to incorporate them into overflow.
if (cacheFlag == CacheRenderBoxRegionInfo)
return region->setRenderBoxRegionInfo(this, logicalLeftOffset, logicalWidthInRegion, isShifted);
return new RenderBoxRegionInfo(logicalLeftOffset, logicalWidthInRegion, isShifted);
}
static bool shouldFlipBeforeAfterMargins(const RenderStyle& containingBlockStyle, const RenderStyle* childStyle)
{
ASSERT(containingBlockStyle.isHorizontalWritingMode() != childStyle->isHorizontalWritingMode());
WritingMode childWritingMode = childStyle->writingMode();
bool shouldFlip = false;
switch (containingBlockStyle.writingMode()) {
case TopToBottomWritingMode:
shouldFlip = (childWritingMode == RightToLeftWritingMode);
break;
case BottomToTopWritingMode:
shouldFlip = (childWritingMode == RightToLeftWritingMode);
break;
case RightToLeftWritingMode:
shouldFlip = (childWritingMode == BottomToTopWritingMode);
break;
case LeftToRightWritingMode:
shouldFlip = (childWritingMode == BottomToTopWritingMode);
break;
}
if (!containingBlockStyle.isLeftToRightDirection())
shouldFlip = !shouldFlip;
return shouldFlip;
}
void RenderBox::updateLogicalHeight()
{
LogicalExtentComputedValues computedValues;
computeLogicalHeight(logicalHeight(), logicalTop(), computedValues);
setLogicalHeight(computedValues.m_extent);
setLogicalTop(computedValues.m_position);
setMarginBefore(computedValues.m_margins.m_before);
setMarginAfter(computedValues.m_margins.m_after);
}
void RenderBox::computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const
{
computedValues.m_extent = logicalHeight;
computedValues.m_position = logicalTop;
// Cell height is managed by the table and inline non-replaced elements do not support a height property.
if (isTableCell() || (isInline() && !isReplaced()))
return;
Length h;
if (isOutOfFlowPositioned())
computePositionedLogicalHeight(computedValues);
else {
RenderBlock* cb = containingBlock();
bool hasPerpendicularContainingBlock = cb->isHorizontalWritingMode() != isHorizontalWritingMode();
if (!hasPerpendicularContainingBlock) {
bool shouldFlipBeforeAfter = cb->style().writingMode() != style().writingMode();
computeBlockDirectionMargins(cb,
shouldFlipBeforeAfter ? computedValues.m_margins.m_after : computedValues.m_margins.m_before,
shouldFlipBeforeAfter ? computedValues.m_margins.m_before : computedValues.m_margins.m_after);
}
// For tables, calculate margins only.
if (isTable()) {
if (hasPerpendicularContainingBlock) {
bool shouldFlipBeforeAfter = shouldFlipBeforeAfterMargins(cb->style(), &style());
computeInlineDirectionMargins(cb, containingBlockLogicalWidthForContent(), computedValues.m_extent,
shouldFlipBeforeAfter ? computedValues.m_margins.m_after : computedValues.m_margins.m_before,
shouldFlipBeforeAfter ? computedValues.m_margins.m_before : computedValues.m_margins.m_after);
}
return;
}
// FIXME: Account for block-flow in flexible boxes.
// https://bugs.webkit.org/show_bug.cgi?id=46418
bool inHorizontalBox = parent()->isDeprecatedFlexibleBox() && parent()->style().boxOrient() == HORIZONTAL;
bool stretching = parent()->style().boxAlign() == BSTRETCH;
bool treatAsReplaced = shouldComputeSizeAsReplaced() && (!inHorizontalBox || !stretching);
bool checkMinMaxHeight = false;
// The parent box is flexing us, so it has increased or decreased our height. We have to
// grab our cached flexible height.
// FIXME: Account for block-flow in flexible boxes.
// https://bugs.webkit.org/show_bug.cgi?id=46418
if (hasOverrideLogicalContentHeight() && (parent()->isFlexibleBoxIncludingDeprecated()
#if ENABLE(CSS_GRID_LAYOUT)
|| parent()->isRenderGrid()
#endif
))
h = Length(overrideLogicalContentHeight(), Fixed);
else if (treatAsReplaced)
h = Length(computeReplacedLogicalHeight(), Fixed);
else {
h = style().logicalHeight();
checkMinMaxHeight = true;
}
// Block children of horizontal flexible boxes fill the height of the box.
// FIXME: Account for block-flow in flexible boxes.
// https://bugs.webkit.org/show_bug.cgi?id=46418
if (h.isAuto() && is<RenderDeprecatedFlexibleBox>(*parent()) && parent()->style().boxOrient() == HORIZONTAL
&& downcast<RenderDeprecatedFlexibleBox>(*parent()).isStretchingChildren()) {
h = Length(parentBox()->contentLogicalHeight() - marginBefore() - marginAfter() - borderAndPaddingLogicalHeight(), Fixed);
checkMinMaxHeight = false;
}
LayoutUnit heightResult;
if (checkMinMaxHeight) {
heightResult = computeLogicalHeightUsing(style().logicalHeight());
if (heightResult == -1)
heightResult = computedValues.m_extent;
heightResult = constrainLogicalHeightByMinMax(heightResult);
} else {
// The only times we don't check min/max height are when a fixed length has
// been given as an override. Just use that. The value has already been adjusted
// for box-sizing.
heightResult = h.value() + borderAndPaddingLogicalHeight();
}
computedValues.m_extent = heightResult;
if (hasPerpendicularContainingBlock) {
bool shouldFlipBeforeAfter = shouldFlipBeforeAfterMargins(cb->style(), &style());
computeInlineDirectionMargins(cb, containingBlockLogicalWidthForContent(), heightResult,
shouldFlipBeforeAfter ? computedValues.m_margins.m_after : computedValues.m_margins.m_before,
shouldFlipBeforeAfter ? computedValues.m_margins.m_before : computedValues.m_margins.m_after);
}
}
// WinIE quirk: The <html> block always fills the entire canvas in quirks mode. The <body> always fills the
// <html> block in quirks mode. Only apply this quirk if the block is normal flow and no height
// is specified. When we're printing, we also need this quirk if the body or root has a percentage
// height since we don't set a height in RenderView when we're printing. So without this quirk, the
// height has nothing to be a percentage of, and it ends up being 0. That is bad.
bool paginatedContentNeedsBaseHeight = document().printing() && h.isPercentOrCalculated()
&& (isRoot() || (isBody() && document().documentElement()->renderer()->style().logicalHeight().isPercentOrCalculated())) && !isInline();
if (stretchesToViewport() || paginatedContentNeedsBaseHeight) {
LayoutUnit margins = collapsedMarginBefore() + collapsedMarginAfter();
LayoutUnit visibleHeight = view().pageOrViewLogicalHeight();
if (isRoot())
computedValues.m_extent = std::max(computedValues.m_extent, visibleHeight - margins);
else {
LayoutUnit marginsBordersPadding = margins + parentBox()->marginBefore() + parentBox()->marginAfter() + parentBox()->borderAndPaddingLogicalHeight();
computedValues.m_extent = std::max(computedValues.m_extent, visibleHeight - marginsBordersPadding);
}
}
}
LayoutUnit RenderBox::computeLogicalHeightUsing(const Length& height) const
{
LayoutUnit logicalHeight = computeContentAndScrollbarLogicalHeightUsing(height);
if (logicalHeight != -1)
logicalHeight = adjustBorderBoxLogicalHeightForBoxSizing(logicalHeight);
return logicalHeight;
}
LayoutUnit RenderBox::computeContentLogicalHeight(const Length& height) const
{
LayoutUnit heightIncludingScrollbar = computeContentAndScrollbarLogicalHeightUsing(height);
if (heightIncludingScrollbar == -1)
return -1;
return std::max<LayoutUnit>(0, adjustContentBoxLogicalHeightForBoxSizing(heightIncludingScrollbar) - scrollbarLogicalHeight());
}
LayoutUnit RenderBox::computeContentAndScrollbarLogicalHeightUsing(const Length& height) const
{
if (height.isFixed())
return height.value();
if (height.isPercentOrCalculated())
return computePercentageLogicalHeight(height);
return -1;
}
bool RenderBox::skipContainingBlockForPercentHeightCalculation(const RenderBox* containingBlock, bool isPerpendicularWritingMode) const
{
// Flow threads for multicol or paged overflow should be skipped. They are invisible to the DOM,
// and percent heights of children should be resolved against the multicol or paged container.
if (containingBlock->isInFlowRenderFlowThread() && !isPerpendicularWritingMode)
return true;
// For quirks mode and anonymous blocks, we skip auto-height containingBlocks when computing percentages.
// For standards mode, we treat the percentage as auto if it has an auto-height containing block.
if (!document().inQuirksMode() && !containingBlock->isAnonymousBlock())
return false;
return !containingBlock->isTableCell() && !containingBlock->isOutOfFlowPositioned() && containingBlock->style().logicalHeight().isAuto() && isHorizontalWritingMode() == containingBlock->isHorizontalWritingMode();
}
LayoutUnit RenderBox::computePercentageLogicalHeight(const Length& height) const
{
LayoutUnit availableHeight = -1;
bool skippedAutoHeightContainingBlock = false;
RenderBlock* cb = containingBlock();
const RenderBox* containingBlockChild = this;
LayoutUnit rootMarginBorderPaddingHeight = 0;
bool isHorizontal = isHorizontalWritingMode();
while (!cb->isRenderView() && skipContainingBlockForPercentHeightCalculation(cb, isHorizontal != cb->isHorizontalWritingMode())) {
if (cb->isBody() || cb->isRoot())
rootMarginBorderPaddingHeight += cb->marginBefore() + cb->marginAfter() + cb->borderAndPaddingLogicalHeight();
skippedAutoHeightContainingBlock = true;
containingBlockChild = cb;
cb = cb->containingBlock();
cb->addPercentHeightDescendant(const_cast<RenderBox&>(*this));
}
const RenderStyle& cbstyle = cb->style();
// A positioned element that specified both top/bottom or that specifies height should be treated as though it has a height
// explicitly specified that can be used for any percentage computations.
bool isOutOfFlowPositionedWithSpecifiedHeight = cb->isOutOfFlowPositioned() && (!cbstyle.logicalHeight().isAuto() || (!cbstyle.logicalTop().isAuto() && !cbstyle.logicalBottom().isAuto()));
bool includeBorderPadding = isTable();
if (isHorizontal != cb->isHorizontalWritingMode())
availableHeight = containingBlockChild->containingBlockLogicalWidthForContent();
#if ENABLE(CSS_GRID_LAYOUT)
else if (hasOverrideContainingBlockLogicalHeight())
availableHeight = overrideContainingBlockContentLogicalHeight();
#endif
else if (is<RenderTableCell>(*cb)) {
if (!skippedAutoHeightContainingBlock) {
// Table cells violate what the CSS spec says to do with heights. Basically we
// don't care if the cell specified a height or not. We just always make ourselves
// be a percentage of the cell's current content height.
if (!cb->hasOverrideLogicalContentHeight()) {
// Normally we would let the cell size intrinsically, but scrolling overflow has to be
// treated differently, since WinIE lets scrolled overflow regions shrink as needed.
// While we can't get all cases right, we can at least detect when the cell has a specified
// height or when the table has a specified height. In these cases we want to initially have
// no size and allow the flexing of the table or the cell to its specified height to cause us
// to grow to fill the space. This could end up being wrong in some cases, but it is
// preferable to the alternative (sizing intrinsically and making the row end up too big).
RenderTableCell& cell = downcast<RenderTableCell>(*cb);
if (scrollsOverflowY() && (!cell.style().logicalHeight().isAuto() || !cell.table()->style().logicalHeight().isAuto()))
return 0;
return -1;
}
availableHeight = cb->overrideLogicalContentHeight();
includeBorderPadding = true;
}
} else if (cbstyle.logicalHeight().isFixed()) {
LayoutUnit contentBoxHeight = cb->adjustContentBoxLogicalHeightForBoxSizing(cbstyle.logicalHeight().value());
availableHeight = std::max<LayoutUnit>(0, cb->constrainContentBoxLogicalHeightByMinMax(contentBoxHeight - cb->scrollbarLogicalHeight()));
} else if (cbstyle.logicalHeight().isPercentOrCalculated() && !isOutOfFlowPositionedWithSpecifiedHeight) {
// We need to recur and compute the percentage height for our containing block.
LayoutUnit heightWithScrollbar = cb->computePercentageLogicalHeight(cbstyle.logicalHeight());
if (heightWithScrollbar != -1) {
LayoutUnit contentBoxHeightWithScrollbar = cb->adjustContentBoxLogicalHeightForBoxSizing(heightWithScrollbar);
// We need to adjust for min/max height because this method does not
// handle the min/max of the current block, its caller does. So the
// return value from the recursive call will not have been adjusted
// yet.
LayoutUnit contentBoxHeight = cb->constrainContentBoxLogicalHeightByMinMax(contentBoxHeightWithScrollbar - cb->scrollbarLogicalHeight());
availableHeight = std::max<LayoutUnit>(0, contentBoxHeight);
}
} else if (isOutOfFlowPositionedWithSpecifiedHeight) {
// Don't allow this to affect the block' height() member variable, since this
// can get called while the block is still laying out its kids.
LogicalExtentComputedValues computedValues;
cb->computeLogicalHeight(cb->logicalHeight(), 0, computedValues);
availableHeight = computedValues.m_extent - cb->borderAndPaddingLogicalHeight() - cb->scrollbarLogicalHeight();
} else if (cb->isRenderView())
availableHeight = view().pageOrViewLogicalHeight();
if (availableHeight == -1)
return availableHeight;
availableHeight -= rootMarginBorderPaddingHeight;
LayoutUnit result = valueForLength(height, availableHeight);
if (includeBorderPadding) {
// FIXME: Table cells should default to box-sizing: border-box so we can avoid this hack.
// It is necessary to use the border-box to match WinIE's broken
// box model. This is essential for sizing inside
// table cells using percentage heights.
result -= borderAndPaddingLogicalHeight();
return std::max<LayoutUnit>(0, result);
}
return result;
}
LayoutUnit RenderBox::computeReplacedLogicalWidth(ShouldComputePreferred shouldComputePreferred) const
{
return computeReplacedLogicalWidthRespectingMinMaxWidth(computeReplacedLogicalWidthUsing(style().logicalWidth()), shouldComputePreferred);
}
LayoutUnit RenderBox::computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit logicalWidth, ShouldComputePreferred shouldComputePreferred) const
{
LayoutUnit minLogicalWidth = (shouldComputePreferred == ComputePreferred && style().logicalMinWidth().isPercentOrCalculated()) || style().logicalMinWidth().isUndefined() ? logicalWidth : computeReplacedLogicalWidthUsing(style().logicalMinWidth());
LayoutUnit maxLogicalWidth = (shouldComputePreferred == ComputePreferred && style().logicalMaxWidth().isPercentOrCalculated()) || style().logicalMaxWidth().isUndefined() ? logicalWidth : computeReplacedLogicalWidthUsing(style().logicalMaxWidth());
return std::max(minLogicalWidth, std::min(logicalWidth, maxLogicalWidth));
}
LayoutUnit RenderBox::computeReplacedLogicalWidthUsing(Length logicalWidth) const
{
switch (logicalWidth.type()) {
case Fixed:
return adjustContentBoxLogicalWidthForBoxSizing(logicalWidth.value());
case MinContent:
case MaxContent: {
// MinContent/MaxContent don't need the availableLogicalWidth argument.
LayoutUnit availableLogicalWidth = 0;
return computeIntrinsicLogicalWidthUsing(logicalWidth, availableLogicalWidth, borderAndPaddingLogicalWidth()) - borderAndPaddingLogicalWidth();
}
case FitContent:
case FillAvailable:
case Percent:
case Calculated: {
// FIXME: containingBlockLogicalWidthForContent() is wrong if the replaced element's block-flow is perpendicular to the
// containing block's block-flow.
// https://bugs.webkit.org/show_bug.cgi?id=46496
const LayoutUnit cw = isOutOfFlowPositioned() ? containingBlockLogicalWidthForPositioned(downcast<RenderBoxModelObject>(container())) : containingBlockLogicalWidthForContent();
Length containerLogicalWidth = containingBlock()->style().logicalWidth();
// FIXME: Handle cases when containing block width is calculated or viewport percent.
// https://bugs.webkit.org/show_bug.cgi?id=91071
if (logicalWidth.isIntrinsic())
return computeIntrinsicLogicalWidthUsing(logicalWidth, cw, borderAndPaddingLogicalWidth()) - borderAndPaddingLogicalWidth();
if (cw > 0 || (!cw && (containerLogicalWidth.isFixed() || containerLogicalWidth.isPercentOrCalculated())))
return adjustContentBoxLogicalWidthForBoxSizing(minimumValueForLength(logicalWidth, cw));
}
FALLTHROUGH;
case Intrinsic:
case MinIntrinsic:
case Auto:
case Relative:
case Undefined:
return intrinsicLogicalWidth();
}
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit RenderBox::computeReplacedLogicalHeight() const
{
return computeReplacedLogicalHeightRespectingMinMaxHeight(computeReplacedLogicalHeightUsing(style().logicalHeight()));
}
LayoutUnit RenderBox::computeReplacedLogicalHeightRespectingMinMaxHeight(LayoutUnit logicalHeight) const
{
LayoutUnit minLogicalHeight = computeReplacedLogicalHeightUsing(style().logicalMinHeight());
LayoutUnit maxLogicalHeight = style().logicalMaxHeight().isUndefined() ? logicalHeight : computeReplacedLogicalHeightUsing(style().logicalMaxHeight());
return std::max(minLogicalHeight, std::min(logicalHeight, maxLogicalHeight));
}
LayoutUnit RenderBox::computeReplacedLogicalHeightUsing(Length logicalHeight) const
{
switch (logicalHeight.type()) {
case Fixed:
return adjustContentBoxLogicalHeightForBoxSizing(logicalHeight.value());
case Percent:
case Calculated:
{
auto cb = isOutOfFlowPositioned() ? container() : containingBlock();
while (cb->isAnonymous() && !is<RenderView>(*cb)) {
cb = cb->containingBlock();
downcast<RenderBlock>(*cb).addPercentHeightDescendant(const_cast<RenderBox&>(*this));
}
// FIXME: This calculation is not patched for block-flow yet.
// https://bugs.webkit.org/show_bug.cgi?id=46500
if (cb->isOutOfFlowPositioned() && cb->style().height().isAuto() && !(cb->style().top().isAuto() || cb->style().bottom().isAuto())) {
ASSERT_WITH_SECURITY_IMPLICATION(cb->isRenderBlock());
RenderBlock& block = downcast<RenderBlock>(*cb);
LogicalExtentComputedValues computedValues;
block.computeLogicalHeight(block.logicalHeight(), 0, computedValues);
LayoutUnit newContentHeight = computedValues.m_extent - block.borderAndPaddingLogicalHeight() - block.scrollbarLogicalHeight();
LayoutUnit newHeight = block.adjustContentBoxLogicalHeightForBoxSizing(newContentHeight);
return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(logicalHeight, newHeight));
}
// FIXME: availableLogicalHeight() is wrong if the replaced element's block-flow is perpendicular to the
// containing block's block-flow.
// https://bugs.webkit.org/show_bug.cgi?id=46496
LayoutUnit availableHeight;
if (isOutOfFlowPositioned())
availableHeight = containingBlockLogicalHeightForPositioned(downcast<RenderBoxModelObject>(cb));
else {
availableHeight = containingBlockLogicalHeightForContent(IncludeMarginBorderPadding);
// It is necessary to use the border-box to match WinIE's broken
// box model. This is essential for sizing inside
// table cells using percentage heights.
// FIXME: This needs to be made block-flow-aware. If the cell and image are perpendicular block-flows, this isn't right.
// https://bugs.webkit.org/show_bug.cgi?id=46997
while (cb && !cb->isRenderView() && (cb->style().logicalHeight().isAuto() || cb->style().logicalHeight().isPercentOrCalculated())) {
if (cb->isTableCell()) {
// Don't let table cells squeeze percent-height replaced elements
// <http://bugs.webkit.org/show_bug.cgi?id=15359>
availableHeight = std::max(availableHeight, intrinsicLogicalHeight());
return valueForLength(logicalHeight, availableHeight - borderAndPaddingLogicalHeight());
}
downcast<RenderBlock>(*cb).addPercentHeightDescendant(const_cast<RenderBox&>(*this));
cb = cb->containingBlock();
}
}
return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(logicalHeight, availableHeight));
}
default:
return intrinsicLogicalHeight();
}
}
LayoutUnit RenderBox::availableLogicalHeight(AvailableLogicalHeightType heightType) const
{
return constrainLogicalHeightByMinMax(availableLogicalHeightUsing(style().logicalHeight(), heightType));
}
LayoutUnit RenderBox::availableLogicalHeightUsing(const Length& h, AvailableLogicalHeightType heightType) const
{
// We need to stop here, since we don't want to increase the height of the table
// artificially. We're going to rely on this cell getting expanded to some new
// height, and then when we lay out again we'll use the calculation below.
if (isTableCell() && (h.isAuto() || h.isPercentOrCalculated())) {
if (hasOverrideLogicalContentHeight())
return overrideLogicalContentHeight();
return logicalHeight() - borderAndPaddingLogicalHeight();
}
if (h.isPercentOrCalculated() && isOutOfFlowPositioned() && !isRenderFlowThread()) {
// FIXME: This is wrong if the containingBlock has a perpendicular writing mode.
LayoutUnit availableHeight = containingBlockLogicalHeightForPositioned(containingBlock());
return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(h, availableHeight));
}
LayoutUnit heightIncludingScrollbar = computeContentAndScrollbarLogicalHeightUsing(h);
if (heightIncludingScrollbar != -1)
return std::max<LayoutUnit>(0, adjustContentBoxLogicalHeightForBoxSizing(heightIncludingScrollbar) - scrollbarLogicalHeight());
// FIXME: Check logicalTop/logicalBottom here to correctly handle vertical writing-mode.
// https://bugs.webkit.org/show_bug.cgi?id=46500
if (is<RenderBlock>(*this) && isOutOfFlowPositioned() && style().height().isAuto() && !(style().top().isAuto() || style().bottom().isAuto())) {
RenderBlock& block = const_cast<RenderBlock&>(downcast<RenderBlock>(*this));
LogicalExtentComputedValues computedValues;
block.computeLogicalHeight(block.logicalHeight(), 0, computedValues);
LayoutUnit newContentHeight = computedValues.m_extent - block.borderAndPaddingLogicalHeight() - block.scrollbarLogicalHeight();
return adjustContentBoxLogicalHeightForBoxSizing(newContentHeight);
}
// FIXME: This is wrong if the containingBlock has a perpendicular writing mode.
LayoutUnit availableHeight = containingBlockLogicalHeightForContent(heightType);
if (heightType == ExcludeMarginBorderPadding) {
// FIXME: Margin collapsing hasn't happened yet, so this incorrectly removes collapsed margins.
availableHeight -= marginBefore() + marginAfter() + borderAndPaddingLogicalHeight();
}
return availableHeight;
}
void RenderBox::computeBlockDirectionMargins(const RenderBlock* containingBlock, LayoutUnit& marginBefore, LayoutUnit& marginAfter) const
{
if (isTableCell()) {
// FIXME: Not right if we allow cells to have different directionality than the table. If we do allow this, though,
// we may just do it with an extra anonymous block inside the cell.
marginBefore = 0;
marginAfter = 0;
return;
}
// Margins are calculated with respect to the logical width of
// the containing block (8.3)
LayoutUnit cw = containingBlockLogicalWidthForContent();
const RenderStyle& containingBlockStyle = containingBlock->style();
marginBefore = minimumValueForLength(style().marginBeforeUsing(&containingBlockStyle), cw);
marginAfter = minimumValueForLength(style().marginAfterUsing(&containingBlockStyle), cw);
}
void RenderBox::computeAndSetBlockDirectionMargins(const RenderBlock* containingBlock)
{
LayoutUnit marginBefore;
LayoutUnit marginAfter;
computeBlockDirectionMargins(containingBlock, marginBefore, marginAfter);
containingBlock->setMarginBeforeForChild(*this, marginBefore);
containingBlock->setMarginAfterForChild(*this, marginAfter);
}
LayoutUnit RenderBox::containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock, RenderRegion* region, bool checkForPerpendicularWritingMode) const
{
if (checkForPerpendicularWritingMode && containingBlock->isHorizontalWritingMode() != isHorizontalWritingMode())
return containingBlockLogicalHeightForPositioned(containingBlock, false);
if (is<RenderBox>(*containingBlock)) {
bool isFixedPosition = style().position() == FixedPosition;
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!flowThread) {
if (isFixedPosition && is<RenderView>(*containingBlock))
return downcast<RenderView>(*containingBlock).clientLogicalWidthForFixedPosition();
return downcast<RenderBox>(*containingBlock).clientLogicalWidth();
}
if (isFixedPosition && is<RenderNamedFlowThread>(*containingBlock))
return containingBlock->view().clientLogicalWidth();
if (!is<RenderBlock>(*containingBlock))
return downcast<RenderBox>(*containingBlock).clientLogicalWidth();
const RenderBlock& cb = downcast<RenderBlock>(*containingBlock);
RenderBoxRegionInfo* boxInfo = nullptr;
if (!region) {
if (is<RenderFlowThread>(*containingBlock) && !checkForPerpendicularWritingMode)
return downcast<RenderFlowThread>(*containingBlock).contentLogicalWidthOfFirstRegion();
if (isWritingModeRoot()) {
LayoutUnit cbPageOffset = cb.offsetFromLogicalTopOfFirstPage();
RenderRegion* cbRegion = cb.regionAtBlockOffset(cbPageOffset);
if (cbRegion)
boxInfo = cb.renderBoxRegionInfo(cbRegion);
}
} else if (flowThread->isHorizontalWritingMode() == containingBlock->isHorizontalWritingMode()) {
RenderRegion* containingBlockRegion = cb.clampToStartAndEndRegions(region);
boxInfo = cb.renderBoxRegionInfo(containingBlockRegion);
}
return (boxInfo) ? std::max<LayoutUnit>(0, cb.clientLogicalWidth() - (cb.logicalWidth() - boxInfo->logicalWidth())) : cb.clientLogicalWidth();
}
ASSERT(containingBlock->isInFlowPositioned());
const auto& flow = downcast<RenderInline>(*containingBlock);
InlineFlowBox* first = flow.firstLineBox();
InlineFlowBox* last = flow.lastLineBox();
// If the containing block is empty, return a width of 0.
if (!first || !last)
return 0;
LayoutUnit fromLeft;
LayoutUnit fromRight;
if (containingBlock->style().isLeftToRightDirection()) {
fromLeft = first->logicalLeft() + first->borderLogicalLeft();
fromRight = last->logicalLeft() + last->logicalWidth() - last->borderLogicalRight();
} else {
fromRight = first->logicalLeft() + first->logicalWidth() - first->borderLogicalRight();
fromLeft = last->logicalLeft() + last->borderLogicalLeft();
}
return std::max<LayoutUnit>(0, fromRight - fromLeft);
}
LayoutUnit RenderBox::containingBlockLogicalHeightForPositioned(const RenderBoxModelObject* containingBlock, bool checkForPerpendicularWritingMode) const
{
if (checkForPerpendicularWritingMode && containingBlock->isHorizontalWritingMode() != isHorizontalWritingMode())
return containingBlockLogicalWidthForPositioned(containingBlock, nullptr, false);
if (containingBlock->isBox()) {
bool isFixedPosition = style().position() == FixedPosition;
if (isFixedPosition && is<RenderView>(*containingBlock))
return downcast<RenderView>(*containingBlock).clientLogicalHeightForFixedPosition();
const RenderBlock* cb = is<RenderBlock>(*containingBlock) ? downcast<RenderBlock>(containingBlock) : containingBlock->containingBlock();
LayoutUnit result = cb->clientLogicalHeight();
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread && is<RenderFlowThread>(*containingBlock) && flowThread->isHorizontalWritingMode() == containingBlock->isHorizontalWritingMode()) {
if (is<RenderNamedFlowThread>(*containingBlock) && isFixedPosition)
return containingBlock->view().clientLogicalHeight();
return downcast<RenderFlowThread>(*containingBlock).contentLogicalHeightOfFirstRegion();
}
return result;
}
ASSERT(containingBlock->isInFlowPositioned());
const auto& flow = downcast<RenderInline>(*containingBlock);
InlineFlowBox* first = flow.firstLineBox();
InlineFlowBox* last = flow.lastLineBox();
// If the containing block is empty, return a height of 0.
if (!first || !last)
return 0;
LayoutUnit heightResult;
LayoutRect boundingBox = flow.linesBoundingBox();
if (containingBlock->isHorizontalWritingMode())
heightResult = boundingBox.height();
else
heightResult = boundingBox.width();
heightResult -= (containingBlock->borderBefore() + containingBlock->borderAfter());
return heightResult;
}
static void computeInlineStaticDistance(Length& logicalLeft, Length& logicalRight, const RenderBox* child, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalWidth, RenderRegion* region)
{
if (!logicalLeft.isAuto() || !logicalRight.isAuto())
return;
// FIXME: The static distance computation has not been patched for mixed writing modes yet.
if (child->parent()->style().direction() == LTR) {
LayoutUnit staticPosition = child->layer()->staticInlinePosition() - containerBlock->borderLogicalLeft();
for (auto current = child->parent(); current && current != containerBlock; current = current->container()) {
if (is<RenderBox>(*current)) {
staticPosition += downcast<RenderBox>(*current).logicalLeft();
if (region && is<RenderBlock>(*current)) {
const RenderBlock& currentBlock = downcast<RenderBlock>(*current);
region = currentBlock.clampToStartAndEndRegions(region);
RenderBoxRegionInfo* boxInfo = currentBlock.renderBoxRegionInfo(region);
if (boxInfo)
staticPosition += boxInfo->logicalLeft();
}
}
}
logicalLeft.setValue(Fixed, staticPosition);
} else {
RenderBox& enclosingBox = child->parent()->enclosingBox();
LayoutUnit staticPosition = child->layer()->staticInlinePosition() + containerLogicalWidth + containerBlock->borderLogicalLeft();
for (RenderElement* current = &enclosingBox; current; current = current->container()) {
if (is<RenderBox>(*current)) {
if (current != containerBlock)
staticPosition -= downcast<RenderBox>(*current).logicalLeft();
if (current == &enclosingBox)
staticPosition -= enclosingBox.logicalWidth();
if (region && is<RenderBlock>(*current)) {
const RenderBlock& currentBlock = downcast<RenderBlock>(*current);
region = currentBlock.clampToStartAndEndRegions(region);
RenderBoxRegionInfo* boxInfo = currentBlock.renderBoxRegionInfo(region);
if (boxInfo) {
if (current != containerBlock)
staticPosition -= currentBlock.logicalWidth() - (boxInfo->logicalLeft() + boxInfo->logicalWidth());
if (current == &enclosingBox)
staticPosition += enclosingBox.logicalWidth() - boxInfo->logicalWidth();
}
}
}
if (current == containerBlock)
break;
}
logicalRight.setValue(Fixed, staticPosition);
}
}
void RenderBox::computePositionedLogicalWidth(LogicalExtentComputedValues& computedValues, RenderRegion* region) const
{
if (isReplaced()) {
// FIXME: Positioned replaced elements inside a flow thread are not working properly
// with variable width regions (see https://bugs.webkit.org/show_bug.cgi?id=69896 ).
computePositionedLogicalWidthReplaced(computedValues);
return;
}
// QUESTIONS
// FIXME 1: Should we still deal with these the cases of 'left' or 'right' having
// the type 'static' in determining whether to calculate the static distance?
// NOTE: 'static' is not a legal value for 'left' or 'right' as of CSS 2.1.
// FIXME 2: Can perhaps optimize out cases when max-width/min-width are greater
// than or less than the computed width(). Be careful of box-sizing and
// percentage issues.
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.3.7 "Absolutely positioned, non-replaced elements"
// <http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width>
// (block-style-comments in this function and in computePositionedLogicalWidthUsing()
// correspond to text from the spec)
// We don't use containingBlock(), since we may be positioned by an enclosing
// relative positioned inline.
const RenderBoxModelObject* containerBlock = downcast<RenderBoxModelObject>(container());
const LayoutUnit containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, region);
// Use the container block's direction except when calculating the static distance
// This conforms with the reference results for abspos-replaced-width-margin-000.htm
// of the CSS 2.1 test suite
TextDirection containerDirection = containerBlock->style().direction();
bool isHorizontal = isHorizontalWritingMode();
const LayoutUnit bordersPlusPadding = borderAndPaddingLogicalWidth();
const Length marginLogicalLeft = isHorizontal ? style().marginLeft() : style().marginTop();
const Length marginLogicalRight = isHorizontal ? style().marginRight() : style().marginBottom();
Length logicalLeftLength = style().logicalLeft();
Length logicalRightLength = style().logicalRight();
/*---------------------------------------------------------------------------*\
* For the purposes of this section and the next, the term "static position"
* (of an element) refers, roughly, to the position an element would have had
* in the normal flow. More precisely:
*
* * The static position for 'left' is the distance from the left edge of the
* containing block to the left margin edge of a hypothetical box that would
* have been the first box of the element if its 'position' property had
* been 'static' and 'float' had been 'none'. The value is negative if the
* hypothetical box is to the left of the containing block.
* * The static position for 'right' is the distance from the right edge of the
* containing block to the right margin edge of the same hypothetical box as
* above. The value is positive if the hypothetical box is to the left of the
* containing block's edge.
*
* But rather than actually calculating the dimensions of that hypothetical box,
* user agents are free to make a guess at its probable position.
*
* For the purposes of calculating the static position, the containing block of
* fixed positioned elements is the initial containing block instead of the
* viewport, and all scrollable boxes should be assumed to be scrolled to their
* origin.
\*---------------------------------------------------------------------------*/
// see FIXME 1
// Calculate the static distance if needed.
computeInlineStaticDistance(logicalLeftLength, logicalRightLength, this, containerBlock, containerLogicalWidth, region);
// Calculate constraint equation values for 'width' case.
computePositionedLogicalWidthUsing(style().logicalWidth(), containerBlock, containerDirection,
containerLogicalWidth, bordersPlusPadding,
logicalLeftLength, logicalRightLength, marginLogicalLeft, marginLogicalRight,
computedValues);
// Calculate constraint equation values for 'max-width' case.
if (!style().logicalMaxWidth().isUndefined()) {
LogicalExtentComputedValues maxValues;
computePositionedLogicalWidthUsing(style().logicalMaxWidth(), containerBlock, containerDirection,
containerLogicalWidth, bordersPlusPadding,
logicalLeftLength, logicalRightLength, marginLogicalLeft, marginLogicalRight,
maxValues);
if (computedValues.m_extent > maxValues.m_extent) {
computedValues.m_extent = maxValues.m_extent;
computedValues.m_position = maxValues.m_position;
computedValues.m_margins.m_start = maxValues.m_margins.m_start;
computedValues.m_margins.m_end = maxValues.m_margins.m_end;
}
}
// Calculate constraint equation values for 'min-width' case.
if (!style().logicalMinWidth().isZero() || style().logicalMinWidth().isIntrinsic()) {
LogicalExtentComputedValues minValues;
computePositionedLogicalWidthUsing(style().logicalMinWidth(), containerBlock, containerDirection,
containerLogicalWidth, bordersPlusPadding,
logicalLeftLength, logicalRightLength, marginLogicalLeft, marginLogicalRight,
minValues);
if (computedValues.m_extent < minValues.m_extent) {
computedValues.m_extent = minValues.m_extent;
computedValues.m_position = minValues.m_position;
computedValues.m_margins.m_start = minValues.m_margins.m_start;
computedValues.m_margins.m_end = minValues.m_margins.m_end;
}
}
computedValues.m_extent += bordersPlusPadding;
// Adjust logicalLeft if we need to for the flipped version of our writing mode in regions.
// FIXME: Add support for other types of objects as containerBlock, not only RenderBlock.
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread && !region && isWritingModeRoot() && isHorizontalWritingMode() == containerBlock->isHorizontalWritingMode() && is<RenderBlock>(*containerBlock)) {
ASSERT(containerBlock->canHaveBoxInfoInRegion());
LayoutUnit logicalLeftPos = computedValues.m_position;
const RenderBlock& renderBlock = downcast<RenderBlock>(*containerBlock);
LayoutUnit cbPageOffset = renderBlock.offsetFromLogicalTopOfFirstPage();
RenderRegion* cbRegion = renderBlock.regionAtBlockOffset(cbPageOffset);
if (cbRegion) {
RenderBoxRegionInfo* boxInfo = renderBlock.renderBoxRegionInfo(cbRegion);
if (boxInfo) {
logicalLeftPos += boxInfo->logicalLeft();
computedValues.m_position = logicalLeftPos;
}
}
}
}
static void computeLogicalLeftPositionedOffset(LayoutUnit& logicalLeftPos, const RenderBox* child, LayoutUnit logicalWidthValue, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalWidth)
{
// Deal with differing writing modes here. Our offset needs to be in the containing block's coordinate space. If the containing block is flipped
// along this axis, then we need to flip the coordinate. This can only happen if the containing block is both a flipped mode and perpendicular to us.
if (containerBlock->isHorizontalWritingMode() != child->isHorizontalWritingMode() && containerBlock->style().isFlippedBlocksWritingMode()) {
logicalLeftPos = containerLogicalWidth - logicalWidthValue - logicalLeftPos;
logicalLeftPos += (child->isHorizontalWritingMode() ? containerBlock->borderRight() : containerBlock->borderBottom());
} else
logicalLeftPos += (child->isHorizontalWritingMode() ? containerBlock->borderLeft() : containerBlock->borderTop());
}
void RenderBox::computePositionedLogicalWidthUsing(Length logicalWidth, const RenderBoxModelObject* containerBlock, TextDirection containerDirection,
LayoutUnit containerLogicalWidth, LayoutUnit bordersPlusPadding,
Length logicalLeft, Length logicalRight, Length marginLogicalLeft, Length marginLogicalRight,
LogicalExtentComputedValues& computedValues) const
{
if (logicalWidth.isIntrinsic())
logicalWidth = Length(computeIntrinsicLogicalWidthUsing(logicalWidth, containerLogicalWidth, bordersPlusPadding) - bordersPlusPadding, Fixed);
// 'left' and 'right' cannot both be 'auto' because one would of been
// converted to the static position already
ASSERT(!(logicalLeft.isAuto() && logicalRight.isAuto()));
LayoutUnit logicalLeftValue = 0;
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, nullptr, false);
bool logicalWidthIsAuto = logicalWidth.isIntrinsicOrAuto();
bool logicalLeftIsAuto = logicalLeft.isAuto();
bool logicalRightIsAuto = logicalRight.isAuto();
LayoutUnit& marginLogicalLeftValue = style().isLeftToRightDirection() ? computedValues.m_margins.m_start : computedValues.m_margins.m_end;
LayoutUnit& marginLogicalRightValue = style().isLeftToRightDirection() ? computedValues.m_margins.m_end : computedValues.m_margins.m_start;
if (!logicalLeftIsAuto && !logicalWidthIsAuto && !logicalRightIsAuto) {
/*-----------------------------------------------------------------------*\
* If none of the three is 'auto': If both 'margin-left' and 'margin-
* right' are 'auto', solve the equation under the extra constraint that
* the two margins get equal values, unless this would make them negative,
* in which case when direction of the containing block is 'ltr' ('rtl'),
* set 'margin-left' ('margin-right') to zero and solve for 'margin-right'
* ('margin-left'). If one of 'margin-left' or 'margin-right' is 'auto',
* solve the equation for that value. If the values are over-constrained,
* ignore the value for 'left' (in case the 'direction' property of the
* containing block is 'rtl') or 'right' (in case 'direction' is 'ltr')
* and solve for that value.
\*-----------------------------------------------------------------------*/
// NOTE: It is not necessary to solve for 'right' in the over constrained
// case because the value is not used for any further calculations.
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
computedValues.m_extent = adjustContentBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, containerLogicalWidth));
const LayoutUnit availableSpace = containerLogicalWidth - (logicalLeftValue + computedValues.m_extent + valueForLength(logicalRight, containerLogicalWidth) + bordersPlusPadding);
// Margins are now the only unknown
if (marginLogicalLeft.isAuto() && marginLogicalRight.isAuto()) {
// Both margins auto, solve for equality
if (availableSpace >= 0) {
marginLogicalLeftValue = availableSpace / 2; // split the difference
marginLogicalRightValue = availableSpace - marginLogicalLeftValue; // account for odd valued differences
} else {
// Use the containing block's direction rather than the parent block's
// per CSS 2.1 reference test abspos-non-replaced-width-margin-000.
if (containerDirection == LTR) {
marginLogicalLeftValue = 0;
marginLogicalRightValue = availableSpace; // will be negative
} else {
marginLogicalLeftValue = availableSpace; // will be negative
marginLogicalRightValue = 0;
}
}
} else if (marginLogicalLeft.isAuto()) {
// Solve for left margin
marginLogicalRightValue = valueForLength(marginLogicalRight, containerRelativeLogicalWidth);
marginLogicalLeftValue = availableSpace - marginLogicalRightValue;
} else if (marginLogicalRight.isAuto()) {
// Solve for right margin
marginLogicalLeftValue = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
marginLogicalRightValue = availableSpace - marginLogicalLeftValue;
} else {
// Over-constrained, solve for left if direction is RTL
marginLogicalLeftValue = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
marginLogicalRightValue = valueForLength(marginLogicalRight, containerRelativeLogicalWidth);
// Use the containing block's direction rather than the parent block's
// per CSS 2.1 reference test abspos-non-replaced-width-margin-000.
if (containerDirection == RTL)
logicalLeftValue = (availableSpace + logicalLeftValue) - marginLogicalLeftValue - marginLogicalRightValue;
}
} else {
/*--------------------------------------------------------------------*\
* Otherwise, set 'auto' values for 'margin-left' and 'margin-right'
* to 0, and pick the one of the following six rules that applies.
*
* 1. 'left' and 'width' are 'auto' and 'right' is not 'auto', then the
* width is shrink-to-fit. Then solve for 'left'
*
* OMIT RULE 2 AS IT SHOULD NEVER BE HIT
* ------------------------------------------------------------------
* 2. 'left' and 'right' are 'auto' and 'width' is not 'auto', then if
* the 'direction' property of the containing block is 'ltr' set
* 'left' to the static position, otherwise set 'right' to the
* static position. Then solve for 'left' (if 'direction is 'rtl')
* or 'right' (if 'direction' is 'ltr').
* ------------------------------------------------------------------
*
* 3. 'width' and 'right' are 'auto' and 'left' is not 'auto', then the
* width is shrink-to-fit . Then solve for 'right'
* 4. 'left' is 'auto', 'width' and 'right' are not 'auto', then solve
* for 'left'
* 5. 'width' is 'auto', 'left' and 'right' are not 'auto', then solve
* for 'width'
* 6. 'right' is 'auto', 'left' and 'width' are not 'auto', then solve
* for 'right'
*
* Calculation of the shrink-to-fit width is similar to calculating the
* width of a table cell using the automatic table layout algorithm.
* Roughly: calculate the preferred width by formatting the content
* without breaking lines other than where explicit line breaks occur,
* and also calculate the preferred minimum width, e.g., by trying all
* possible line breaks. CSS 2.1 does not define the exact algorithm.
* Thirdly, calculate the available width: this is found by solving
* for 'width' after setting 'left' (in case 1) or 'right' (in case 3)
* to 0.
*
* Then the shrink-to-fit width is:
* min(max(preferred minimum width, available width), preferred width).
\*--------------------------------------------------------------------*/
// NOTE: For rules 3 and 6 it is not necessary to solve for 'right'
// because the value is not used for any further calculations.
// Calculate margins, 'auto' margins are ignored.
marginLogicalLeftValue = minimumValueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
marginLogicalRightValue = minimumValueForLength(marginLogicalRight, containerRelativeLogicalWidth);
const LayoutUnit availableSpace = containerLogicalWidth - (marginLogicalLeftValue + marginLogicalRightValue + bordersPlusPadding);
// FIXME: Is there a faster way to find the correct case?
// Use rule/case that applies.
if (logicalLeftIsAuto && logicalWidthIsAuto && !logicalRightIsAuto) {
// RULE 1: (use shrink-to-fit for width, and solve of left)
LayoutUnit logicalRightValue = valueForLength(logicalRight, containerLogicalWidth);
// FIXME: would it be better to have shrink-to-fit in one step?
LayoutUnit preferredWidth = maxPreferredLogicalWidth() - bordersPlusPadding;
LayoutUnit preferredMinWidth = minPreferredLogicalWidth() - bordersPlusPadding;
LayoutUnit availableWidth = availableSpace - logicalRightValue;
computedValues.m_extent = std::min(std::max(preferredMinWidth, availableWidth), preferredWidth);
logicalLeftValue = availableSpace - (computedValues.m_extent + logicalRightValue);
} else if (!logicalLeftIsAuto && logicalWidthIsAuto && logicalRightIsAuto) {
// RULE 3: (use shrink-to-fit for width, and no need solve of right)
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
// FIXME: would it be better to have shrink-to-fit in one step?
LayoutUnit preferredWidth = maxPreferredLogicalWidth() - bordersPlusPadding;
LayoutUnit preferredMinWidth = minPreferredLogicalWidth() - bordersPlusPadding;
LayoutUnit availableWidth = availableSpace - logicalLeftValue;
computedValues.m_extent = std::min(std::max(preferredMinWidth, availableWidth), preferredWidth);
} else if (logicalLeftIsAuto && !logicalWidthIsAuto && !logicalRightIsAuto) {
// RULE 4: (solve for left)
computedValues.m_extent = adjustContentBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, containerLogicalWidth));
logicalLeftValue = availableSpace - (computedValues.m_extent + valueForLength(logicalRight, containerLogicalWidth));
} else if (!logicalLeftIsAuto && logicalWidthIsAuto && !logicalRightIsAuto) {
// RULE 5: (solve for width)
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
computedValues.m_extent = availableSpace - (logicalLeftValue + valueForLength(logicalRight, containerLogicalWidth));
} else if (!logicalLeftIsAuto && !logicalWidthIsAuto && logicalRightIsAuto) {
// RULE 6: (no need solve for right)
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
computedValues.m_extent = adjustContentBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, containerLogicalWidth));
}
}
// Use computed values to calculate the horizontal position.
// FIXME: This hack is needed to calculate the logical left position for a 'rtl' relatively
// positioned, inline because right now, it is using the logical left position
// of the first line box when really it should use the last line box. When
// this is fixed elsewhere, this block should be removed.
if (is<RenderInline>(*containerBlock) && !containerBlock->style().isLeftToRightDirection()) {
const auto& flow = downcast<RenderInline>(*containerBlock);
InlineFlowBox* firstLine = flow.firstLineBox();
InlineFlowBox* lastLine = flow.lastLineBox();
if (firstLine && lastLine && firstLine != lastLine) {
computedValues.m_position = logicalLeftValue + marginLogicalLeftValue + lastLine->borderLogicalLeft() + (lastLine->logicalLeft() - firstLine->logicalLeft());
return;
}
}
computedValues.m_position = logicalLeftValue + marginLogicalLeftValue;
computeLogicalLeftPositionedOffset(computedValues.m_position, this, computedValues.m_extent, containerBlock, containerLogicalWidth);
}
static void computeBlockStaticDistance(Length& logicalTop, Length& logicalBottom, const RenderBox* child, const RenderBoxModelObject* containerBlock)
{
if (!logicalTop.isAuto() || !logicalBottom.isAuto())
return;
// FIXME: The static distance computation has not been patched for mixed writing modes.
LayoutUnit staticLogicalTop = child->layer()->staticBlockPosition() - containerBlock->borderBefore();
for (RenderElement* container = child->parent(); container && container != containerBlock; container = container->container()) {
if (is<RenderBox>(*container) && !is<RenderTableRow>(*container))
staticLogicalTop += downcast<RenderBox>(*container).logicalTop();
}
logicalTop.setValue(Fixed, staticLogicalTop);
}
void RenderBox::computePositionedLogicalHeight(LogicalExtentComputedValues& computedValues) const
{
if (isReplaced()) {
computePositionedLogicalHeightReplaced(computedValues);
return;
}
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.6.4 "Absolutely positioned, non-replaced elements"
// <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-non-replaced-height>
// (block-style-comments in this function and in computePositionedLogicalHeightUsing()
// correspond to text from the spec)
// We don't use containingBlock(), since we may be positioned by an enclosing relpositioned inline.
const RenderBoxModelObject* containerBlock = downcast<RenderBoxModelObject>(container());
const LayoutUnit containerLogicalHeight = containingBlockLogicalHeightForPositioned(containerBlock);
const RenderStyle& styleToUse = style();
const LayoutUnit bordersPlusPadding = borderAndPaddingLogicalHeight();
const Length marginBefore = styleToUse.marginBefore();
const Length marginAfter = styleToUse.marginAfter();
Length logicalTopLength = styleToUse.logicalTop();
Length logicalBottomLength = styleToUse.logicalBottom();
/*---------------------------------------------------------------------------*\
* For the purposes of this section and the next, the term "static position"
* (of an element) refers, roughly, to the position an element would have had
* in the normal flow. More precisely, the static position for 'top' is the
* distance from the top edge of the containing block to the top margin edge
* of a hypothetical box that would have been the first box of the element if
* its 'position' property had been 'static' and 'float' had been 'none'. The
* value is negative if the hypothetical box is above the containing block.
*
* But rather than actually calculating the dimensions of that hypothetical
* box, user agents are free to make a guess at its probable position.
*
* For the purposes of calculating the static position, the containing block
* of fixed positioned elements is the initial containing block instead of
* the viewport.
\*---------------------------------------------------------------------------*/
// see FIXME 1
// Calculate the static distance if needed.
computeBlockStaticDistance(logicalTopLength, logicalBottomLength, this, containerBlock);
// Calculate constraint equation values for 'height' case.
LayoutUnit logicalHeight = computedValues.m_extent;
computePositionedLogicalHeightUsing(styleToUse.logicalHeight(), containerBlock, containerLogicalHeight, bordersPlusPadding, logicalHeight,
logicalTopLength, logicalBottomLength, marginBefore, marginAfter,
computedValues);
// Avoid doing any work in the common case (where the values of min-height and max-height are their defaults).
// see FIXME 2
// Calculate constraint equation values for 'max-height' case.
if (!styleToUse.logicalMaxHeight().isUndefined()) {
LogicalExtentComputedValues maxValues;
computePositionedLogicalHeightUsing(styleToUse.logicalMaxHeight(), containerBlock, containerLogicalHeight, bordersPlusPadding, logicalHeight,
logicalTopLength, logicalBottomLength, marginBefore, marginAfter,
maxValues);
if (computedValues.m_extent > maxValues.m_extent) {
computedValues.m_extent = maxValues.m_extent;
computedValues.m_position = maxValues.m_position;
computedValues.m_margins.m_before = maxValues.m_margins.m_before;
computedValues.m_margins.m_after = maxValues.m_margins.m_after;
}
}
// Calculate constraint equation values for 'min-height' case.
if (!styleToUse.logicalMinHeight().isZero()) {
LogicalExtentComputedValues minValues;
computePositionedLogicalHeightUsing(styleToUse.logicalMinHeight(), containerBlock, containerLogicalHeight, bordersPlusPadding, logicalHeight,
logicalTopLength, logicalBottomLength, marginBefore, marginAfter,
minValues);
if (computedValues.m_extent < minValues.m_extent) {
computedValues.m_extent = minValues.m_extent;
computedValues.m_position = minValues.m_position;
computedValues.m_margins.m_before = minValues.m_margins.m_before;
computedValues.m_margins.m_after = minValues.m_margins.m_after;
}
}
// Set final height value.
computedValues.m_extent += bordersPlusPadding;
// Adjust logicalTop if we need to for perpendicular writing modes in regions.
// FIXME: Add support for other types of objects as containerBlock, not only RenderBlock.
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread && isHorizontalWritingMode() != containerBlock->isHorizontalWritingMode() && is<RenderBlock>(*containerBlock)) {
ASSERT(containerBlock->canHaveBoxInfoInRegion());
LayoutUnit logicalTopPos = computedValues.m_position;
const RenderBlock& renderBox = downcast<RenderBlock>(*containerBlock);
LayoutUnit cbPageOffset = renderBox.offsetFromLogicalTopOfFirstPage() - logicalLeft();
RenderRegion* cbRegion = renderBox.regionAtBlockOffset(cbPageOffset);
if (cbRegion) {
RenderBoxRegionInfo* boxInfo = renderBox.renderBoxRegionInfo(cbRegion);
if (boxInfo) {
logicalTopPos += boxInfo->logicalLeft();
computedValues.m_position = logicalTopPos;
}
}
}
}
static void computeLogicalTopPositionedOffset(LayoutUnit& logicalTopPos, const RenderBox* child, LayoutUnit logicalHeightValue, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalHeight)
{
// Deal with differing writing modes here. Our offset needs to be in the containing block's coordinate space. If the containing block is flipped
// along this axis, then we need to flip the coordinate. This can only happen if the containing block is both a flipped mode and perpendicular to us.
if ((child->style().isFlippedBlocksWritingMode() && child->isHorizontalWritingMode() != containerBlock->isHorizontalWritingMode())
|| (child->style().isFlippedBlocksWritingMode() != containerBlock->style().isFlippedBlocksWritingMode() && child->isHorizontalWritingMode() == containerBlock->isHorizontalWritingMode()))
logicalTopPos = containerLogicalHeight - logicalHeightValue - logicalTopPos;
// Our offset is from the logical bottom edge in a flipped environment, e.g., right for vertical-rl and bottom for horizontal-bt.
if (containerBlock->style().isFlippedBlocksWritingMode() && child->isHorizontalWritingMode() == containerBlock->isHorizontalWritingMode()) {
if (child->isHorizontalWritingMode())
logicalTopPos += containerBlock->borderBottom();
else
logicalTopPos += containerBlock->borderRight();
} else {
if (child->isHorizontalWritingMode())
logicalTopPos += containerBlock->borderTop();
else
logicalTopPos += containerBlock->borderLeft();
}
}
void RenderBox::computePositionedLogicalHeightUsing(Length logicalHeightLength, const RenderBoxModelObject* containerBlock,
LayoutUnit containerLogicalHeight, LayoutUnit bordersPlusPadding, LayoutUnit logicalHeight,
Length logicalTop, Length logicalBottom, Length marginBefore, Length marginAfter,
LogicalExtentComputedValues& computedValues) const
{
// 'top' and 'bottom' cannot both be 'auto' because 'top would of been
// converted to the static position in computePositionedLogicalHeight()
ASSERT(!(logicalTop.isAuto() && logicalBottom.isAuto()));
LayoutUnit logicalHeightValue;
LayoutUnit contentLogicalHeight = logicalHeight - bordersPlusPadding;
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, nullptr, false);
LayoutUnit logicalTopValue = 0;
LayoutUnit resolvedLogicalHeight = 0;
bool logicalHeightIsAuto = logicalHeightLength.isAuto();
bool logicalTopIsAuto = logicalTop.isAuto();
bool logicalBottomIsAuto = logicalBottom.isAuto();
// Height is never unsolved for tables.
if (isTable()) {
resolvedLogicalHeight = contentLogicalHeight;
logicalHeightIsAuto = false;
} else
resolvedLogicalHeight = adjustContentBoxLogicalHeightForBoxSizing(valueForLength(logicalHeightLength, containerLogicalHeight));
if (!logicalTopIsAuto && !logicalHeightIsAuto && !logicalBottomIsAuto) {
/*-----------------------------------------------------------------------*\
* If none of the three are 'auto': If both 'margin-top' and 'margin-
* bottom' are 'auto', solve the equation under the extra constraint that
* the two margins get equal values. If one of 'margin-top' or 'margin-
* bottom' is 'auto', solve the equation for that value. If the values
* are over-constrained, ignore the value for 'bottom' and solve for that
* value.
\*-----------------------------------------------------------------------*/
// NOTE: It is not necessary to solve for 'bottom' in the over constrained
// case because the value is not used for any further calculations.
logicalHeightValue = resolvedLogicalHeight;
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
const LayoutUnit availableSpace = containerLogicalHeight - (logicalTopValue + logicalHeightValue + valueForLength(logicalBottom, containerLogicalHeight) + bordersPlusPadding);
// Margins are now the only unknown
if (marginBefore.isAuto() && marginAfter.isAuto()) {
// Both margins auto, solve for equality
// NOTE: This may result in negative values.
computedValues.m_margins.m_before = availableSpace / 2; // split the difference
computedValues.m_margins.m_after = availableSpace - computedValues.m_margins.m_before; // account for odd valued differences
} else if (marginBefore.isAuto()) {
// Solve for top margin
computedValues.m_margins.m_after = valueForLength(marginAfter, containerRelativeLogicalWidth);
computedValues.m_margins.m_before = availableSpace - computedValues.m_margins.m_after;
} else if (marginAfter.isAuto()) {
// Solve for bottom margin
computedValues.m_margins.m_before = valueForLength(marginBefore, containerRelativeLogicalWidth);
computedValues.m_margins.m_after = availableSpace - computedValues.m_margins.m_before;
} else {
// Over-constrained, (no need solve for bottom)
computedValues.m_margins.m_before = valueForLength(marginBefore, containerRelativeLogicalWidth);
computedValues.m_margins.m_after = valueForLength(marginAfter, containerRelativeLogicalWidth);
}
} else {
/*--------------------------------------------------------------------*\
* Otherwise, set 'auto' values for 'margin-top' and 'margin-bottom'
* to 0, and pick the one of the following six rules that applies.
*
* 1. 'top' and 'height' are 'auto' and 'bottom' is not 'auto', then
* the height is based on the content, and solve for 'top'.
*
* OMIT RULE 2 AS IT SHOULD NEVER BE HIT
* ------------------------------------------------------------------
* 2. 'top' and 'bottom' are 'auto' and 'height' is not 'auto', then
* set 'top' to the static position, and solve for 'bottom'.
* ------------------------------------------------------------------
*
* 3. 'height' and 'bottom' are 'auto' and 'top' is not 'auto', then
* the height is based on the content, and solve for 'bottom'.
* 4. 'top' is 'auto', 'height' and 'bottom' are not 'auto', and
* solve for 'top'.
* 5. 'height' is 'auto', 'top' and 'bottom' are not 'auto', and
* solve for 'height'.
* 6. 'bottom' is 'auto', 'top' and 'height' are not 'auto', and
* solve for 'bottom'.
\*--------------------------------------------------------------------*/
// NOTE: For rules 3 and 6 it is not necessary to solve for 'bottom'
// because the value is not used for any further calculations.
// Calculate margins, 'auto' margins are ignored.
computedValues.m_margins.m_before = minimumValueForLength(marginBefore, containerRelativeLogicalWidth);
computedValues.m_margins.m_after = minimumValueForLength(marginAfter, containerRelativeLogicalWidth);
const LayoutUnit availableSpace = containerLogicalHeight - (computedValues.m_margins.m_before + computedValues.m_margins.m_after + bordersPlusPadding);
// Use rule/case that applies.
if (logicalTopIsAuto && logicalHeightIsAuto && !logicalBottomIsAuto) {
// RULE 1: (height is content based, solve of top)
logicalHeightValue = contentLogicalHeight;
logicalTopValue = availableSpace - (logicalHeightValue + valueForLength(logicalBottom, containerLogicalHeight));
} else if (!logicalTopIsAuto && logicalHeightIsAuto && logicalBottomIsAuto) {
// RULE 3: (height is content based, no need solve of bottom)
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalHeightValue = contentLogicalHeight;
} else if (logicalTopIsAuto && !logicalHeightIsAuto && !logicalBottomIsAuto) {
// RULE 4: (solve of top)
logicalHeightValue = resolvedLogicalHeight;
logicalTopValue = availableSpace - (logicalHeightValue + valueForLength(logicalBottom, containerLogicalHeight));
} else if (!logicalTopIsAuto && logicalHeightIsAuto && !logicalBottomIsAuto) {
// RULE 5: (solve of height)
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalHeightValue = std::max<LayoutUnit>(0, availableSpace - (logicalTopValue + valueForLength(logicalBottom, containerLogicalHeight)));
} else if (!logicalTopIsAuto && !logicalHeightIsAuto && logicalBottomIsAuto) {
// RULE 6: (no need solve of bottom)
logicalHeightValue = resolvedLogicalHeight;
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
}
}
computedValues.m_extent = logicalHeightValue;
// Use computed values to calculate the vertical position.
computedValues.m_position = logicalTopValue + computedValues.m_margins.m_before;
computeLogicalTopPositionedOffset(computedValues.m_position, this, logicalHeightValue, containerBlock, containerLogicalHeight);
}
void RenderBox::computePositionedLogicalWidthReplaced(LogicalExtentComputedValues& computedValues) const
{
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.3.8 "Absolutely positioned, replaced elements"
// <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-width>
// (block-style-comments in this function correspond to text from the spec and
// the numbers correspond to numbers in spec)
// We don't use containingBlock(), since we may be positioned by an enclosing
// relative positioned inline.
const RenderBoxModelObject* containerBlock = downcast<RenderBoxModelObject>(container());
const LayoutUnit containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, nullptr, false);
// To match WinIE, in quirks mode use the parent's 'direction' property
// instead of the the container block's.
TextDirection containerDirection = containerBlock->style().direction();
// Variables to solve.
bool isHorizontal = isHorizontalWritingMode();
Length logicalLeft = style().logicalLeft();
Length logicalRight = style().logicalRight();
Length marginLogicalLeft = isHorizontal ? style().marginLeft() : style().marginTop();
Length marginLogicalRight = isHorizontal ? style().marginRight() : style().marginBottom();
LayoutUnit& marginLogicalLeftAlias = style().isLeftToRightDirection() ? computedValues.m_margins.m_start : computedValues.m_margins.m_end;
LayoutUnit& marginLogicalRightAlias = style().isLeftToRightDirection() ? computedValues.m_margins.m_end : computedValues.m_margins.m_start;
/*-----------------------------------------------------------------------*\
* 1. The used value of 'width' is determined as for inline replaced
* elements.
\*-----------------------------------------------------------------------*/
// NOTE: This value of width is final in that the min/max width calculations
// are dealt with in computeReplacedWidth(). This means that the steps to produce
// correct max/min in the non-replaced version, are not necessary.
computedValues.m_extent = computeReplacedLogicalWidth() + borderAndPaddingLogicalWidth();
const LayoutUnit availableSpace = containerLogicalWidth - computedValues.m_extent;
/*-----------------------------------------------------------------------*\
* 2. If both 'left' and 'right' have the value 'auto', then if 'direction'
* of the containing block is 'ltr', set 'left' to the static position;
* else if 'direction' is 'rtl', set 'right' to the static position.
\*-----------------------------------------------------------------------*/
// see FIXME 1
computeInlineStaticDistance(logicalLeft, logicalRight, this, containerBlock, containerLogicalWidth, nullptr); // FIXME: Pass the region.
/*-----------------------------------------------------------------------*\
* 3. If 'left' or 'right' are 'auto', replace any 'auto' on 'margin-left'
* or 'margin-right' with '0'.
\*-----------------------------------------------------------------------*/
if (logicalLeft.isAuto() || logicalRight.isAuto()) {
if (marginLogicalLeft.isAuto())
marginLogicalLeft.setValue(Fixed, 0);
if (marginLogicalRight.isAuto())
marginLogicalRight.setValue(Fixed, 0);
}
/*-----------------------------------------------------------------------*\
* 4. If at this point both 'margin-left' and 'margin-right' are still
* 'auto', solve the equation under the extra constraint that the two
* margins must get equal values, unless this would make them negative,
* in which case when the direction of the containing block is 'ltr'
* ('rtl'), set 'margin-left' ('margin-right') to zero and solve for
* 'margin-right' ('margin-left').
\*-----------------------------------------------------------------------*/
LayoutUnit logicalLeftValue = 0;
LayoutUnit logicalRightValue = 0;
if (marginLogicalLeft.isAuto() && marginLogicalRight.isAuto()) {
// 'left' and 'right' cannot be 'auto' due to step 3
ASSERT(!(logicalLeft.isAuto() && logicalRight.isAuto()));
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth);
LayoutUnit difference = availableSpace - (logicalLeftValue + logicalRightValue);
if (difference > 0) {
marginLogicalLeftAlias = difference / 2; // split the difference
marginLogicalRightAlias = difference - marginLogicalLeftAlias; // account for odd valued differences
} else {
// Use the containing block's direction rather than the parent block's
// per CSS 2.1 reference test abspos-replaced-width-margin-000.
if (containerDirection == LTR) {
marginLogicalLeftAlias = 0;
marginLogicalRightAlias = difference; // will be negative
} else {
marginLogicalLeftAlias = difference; // will be negative
marginLogicalRightAlias = 0;
}
}
/*-----------------------------------------------------------------------*\
* 5. If at this point there is an 'auto' left, solve the equation for
* that value.
\*-----------------------------------------------------------------------*/
} else if (logicalLeft.isAuto()) {
marginLogicalLeftAlias = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
marginLogicalRightAlias = valueForLength(marginLogicalRight, containerRelativeLogicalWidth);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth);
// Solve for 'left'
logicalLeftValue = availableSpace - (logicalRightValue + marginLogicalLeftAlias + marginLogicalRightAlias);
} else if (logicalRight.isAuto()) {
marginLogicalLeftAlias = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
marginLogicalRightAlias = valueForLength(marginLogicalRight, containerRelativeLogicalWidth);
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
// Solve for 'right'
logicalRightValue = availableSpace - (logicalLeftValue + marginLogicalLeftAlias + marginLogicalRightAlias);
} else if (marginLogicalLeft.isAuto()) {
marginLogicalRightAlias = valueForLength(marginLogicalRight, containerRelativeLogicalWidth);
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth);
// Solve for 'margin-left'
marginLogicalLeftAlias = availableSpace - (logicalLeftValue + logicalRightValue + marginLogicalRightAlias);
} else if (marginLogicalRight.isAuto()) {
marginLogicalLeftAlias = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth);
// Solve for 'margin-right'
marginLogicalRightAlias = availableSpace - (logicalLeftValue + logicalRightValue + marginLogicalLeftAlias);
} else {
// Nothing is 'auto', just calculate the values.
marginLogicalLeftAlias = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
marginLogicalRightAlias = valueForLength(marginLogicalRight, containerRelativeLogicalWidth);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth);
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
// If the containing block is right-to-left, then push the left position as far to the right as possible
if (containerDirection == RTL) {
int totalLogicalWidth = computedValues.m_extent + logicalLeftValue + logicalRightValue + marginLogicalLeftAlias + marginLogicalRightAlias;
logicalLeftValue = containerLogicalWidth - (totalLogicalWidth - logicalLeftValue);
}
}
/*-----------------------------------------------------------------------*\
* 6. If at this point the values are over-constrained, ignore the value
* for either 'left' (in case the 'direction' property of the
* containing block is 'rtl') or 'right' (in case 'direction' is
* 'ltr') and solve for that value.
\*-----------------------------------------------------------------------*/
// NOTE: Constraints imposed by the width of the containing block and its content have already been accounted for above.
// FIXME: Deal with differing writing modes here. Our offset needs to be in the containing block's coordinate space, so that
// can make the result here rather complicated to compute.
// Use computed values to calculate the horizontal position.
// FIXME: This hack is needed to calculate the logical left position for a 'rtl' relatively
// positioned, inline containing block because right now, it is using the logical left position
// of the first line box when really it should use the last line box. When
// this is fixed elsewhere, this block should be removed.
if (is<RenderInline>(*containerBlock) && !containerBlock->style().isLeftToRightDirection()) {
const auto& flow = downcast<RenderInline>(*containerBlock);
InlineFlowBox* firstLine = flow.firstLineBox();
InlineFlowBox* lastLine = flow.lastLineBox();
if (firstLine && lastLine && firstLine != lastLine) {
computedValues.m_position = logicalLeftValue + marginLogicalLeftAlias + lastLine->borderLogicalLeft() + (lastLine->logicalLeft() - firstLine->logicalLeft());
return;
}
}
LayoutUnit logicalLeftPos = logicalLeftValue + marginLogicalLeftAlias;
computeLogicalLeftPositionedOffset(logicalLeftPos, this, computedValues.m_extent, containerBlock, containerLogicalWidth);
computedValues.m_position = logicalLeftPos;
}
void RenderBox::computePositionedLogicalHeightReplaced(LogicalExtentComputedValues& computedValues) const
{
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.6.5 "Absolutely positioned, replaced elements"
// <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-height>
// (block-style-comments in this function correspond to text from the spec and
// the numbers correspond to numbers in spec)
// We don't use containingBlock(), since we may be positioned by an enclosing relpositioned inline.
const RenderBoxModelObject* containerBlock = downcast<RenderBoxModelObject>(container());
const LayoutUnit containerLogicalHeight = containingBlockLogicalHeightForPositioned(containerBlock);
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock, nullptr, false);
// Variables to solve.
Length marginBefore = style().marginBefore();
Length marginAfter = style().marginAfter();
LayoutUnit& marginBeforeAlias = computedValues.m_margins.m_before;
LayoutUnit& marginAfterAlias = computedValues.m_margins.m_after;
Length logicalTop = style().logicalTop();
Length logicalBottom = style().logicalBottom();
/*-----------------------------------------------------------------------*\
* 1. The used value of 'height' is determined as for inline replaced
* elements.
\*-----------------------------------------------------------------------*/
// NOTE: This value of height is final in that the min/max height calculations
// are dealt with in computeReplacedHeight(). This means that the steps to produce
// correct max/min in the non-replaced version, are not necessary.
computedValues.m_extent = computeReplacedLogicalHeight() + borderAndPaddingLogicalHeight();
const LayoutUnit availableSpace = containerLogicalHeight - computedValues.m_extent;
/*-----------------------------------------------------------------------*\
* 2. If both 'top' and 'bottom' have the value 'auto', replace 'top'
* with the element's static position.
\*-----------------------------------------------------------------------*/
// see FIXME 1
computeBlockStaticDistance(logicalTop, logicalBottom, this, containerBlock);
/*-----------------------------------------------------------------------*\
* 3. If 'bottom' is 'auto', replace any 'auto' on 'margin-top' or
* 'margin-bottom' with '0'.
\*-----------------------------------------------------------------------*/
// FIXME: The spec. says that this step should only be taken when bottom is
// auto, but if only top is auto, this makes step 4 impossible.
if (logicalTop.isAuto() || logicalBottom.isAuto()) {
if (marginBefore.isAuto())
marginBefore.setValue(Fixed, 0);
if (marginAfter.isAuto())
marginAfter.setValue(Fixed, 0);
}
/*-----------------------------------------------------------------------*\
* 4. If at this point both 'margin-top' and 'margin-bottom' are still
* 'auto', solve the equation under the extra constraint that the two
* margins must get equal values.
\*-----------------------------------------------------------------------*/
LayoutUnit logicalTopValue = 0;
LayoutUnit logicalBottomValue = 0;
if (marginBefore.isAuto() && marginAfter.isAuto()) {
// 'top' and 'bottom' cannot be 'auto' due to step 2 and 3 combined.
ASSERT(!(logicalTop.isAuto() || logicalBottom.isAuto()));
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight);
LayoutUnit difference = availableSpace - (logicalTopValue + logicalBottomValue);
// NOTE: This may result in negative values.
marginBeforeAlias = difference / 2; // split the difference
marginAfterAlias = difference - marginBeforeAlias; // account for odd valued differences
/*-----------------------------------------------------------------------*\
* 5. If at this point there is only one 'auto' left, solve the equation
* for that value.
\*-----------------------------------------------------------------------*/
} else if (logicalTop.isAuto()) {
marginBeforeAlias = valueForLength(marginBefore, containerRelativeLogicalWidth);
marginAfterAlias = valueForLength(marginAfter, containerRelativeLogicalWidth);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight);
// Solve for 'top'
logicalTopValue = availableSpace - (logicalBottomValue + marginBeforeAlias + marginAfterAlias);
} else if (logicalBottom.isAuto()) {
marginBeforeAlias = valueForLength(marginBefore, containerRelativeLogicalWidth);
marginAfterAlias = valueForLength(marginAfter, containerRelativeLogicalWidth);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
// Solve for 'bottom'
// NOTE: It is not necessary to solve for 'bottom' because we don't ever
// use the value.
} else if (marginBefore.isAuto()) {
marginAfterAlias = valueForLength(marginAfter, containerRelativeLogicalWidth);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight);
// Solve for 'margin-top'
marginBeforeAlias = availableSpace - (logicalTopValue + logicalBottomValue + marginAfterAlias);
} else if (marginAfter.isAuto()) {
marginBeforeAlias = valueForLength(marginBefore, containerRelativeLogicalWidth);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight);
// Solve for 'margin-bottom'
marginAfterAlias = availableSpace - (logicalTopValue + logicalBottomValue + marginBeforeAlias);
} else {
// Nothing is 'auto', just calculate the values.
marginBeforeAlias = valueForLength(marginBefore, containerRelativeLogicalWidth);
marginAfterAlias = valueForLength(marginAfter, containerRelativeLogicalWidth);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
// NOTE: It is not necessary to solve for 'bottom' because we don't ever
// use the value.
}
/*-----------------------------------------------------------------------*\
* 6. If at this point the values are over-constrained, ignore the value
* for 'bottom' and solve for that value.
\*-----------------------------------------------------------------------*/
// NOTE: It is not necessary to do this step because we don't end up using
// the value of 'bottom' regardless of whether the values are over-constrained
// or not.
// Use computed values to calculate the vertical position.
LayoutUnit logicalTopPos = logicalTopValue + marginBeforeAlias;
computeLogicalTopPositionedOffset(logicalTopPos, this, computedValues.m_extent, containerBlock, containerLogicalHeight);
computedValues.m_position = logicalTopPos;
}
LayoutRect RenderBox::localCaretRect(InlineBox* box, int caretOffset, LayoutUnit* extraWidthToEndOfLine)
{
// VisiblePositions at offsets inside containers either a) refer to the positions before/after
// those containers (tables and select elements) or b) refer to the position inside an empty block.
// They never refer to children.
// FIXME: Paint the carets inside empty blocks differently than the carets before/after elements.
LayoutRect rect(location(), LayoutSize(caretWidth, height()));
bool ltr = box ? box->isLeftToRightDirection() : style().isLeftToRightDirection();
if ((!caretOffset) ^ ltr)
rect.move(LayoutSize(width() - caretWidth, 0));
if (box) {
const RootInlineBox& rootBox = box->root();
LayoutUnit top = rootBox.lineTop();
rect.setY(top);
rect.setHeight(rootBox.lineBottom() - top);
}
// If height of box is smaller than font height, use the latter one,
// otherwise the caret might become invisible.
//
// Also, if the box is not a replaced element, always use the font height.
// This prevents the "big caret" bug described in:
// <rdar://problem/3777804> Deleting all content in a document can result in giant tall-as-window insertion point
//
// FIXME: ignoring :first-line, missing good reason to take care of
LayoutUnit fontHeight = style().fontMetrics().height();
if (fontHeight > rect.height() || (!isReplaced() && !isTable()))
rect.setHeight(fontHeight);
if (extraWidthToEndOfLine)
*extraWidthToEndOfLine = x() + width() - rect.maxX();
// Move to local coords
rect.moveBy(-location());
// FIXME: Border/padding should be added for all elements but this workaround
// is needed because we use offsets inside an "atomic" element to represent
// positions before and after the element in deprecated editing offsets.
if (element() && !(editingIgnoresContent(element()) || isRenderedTable(element()))) {
rect.setX(rect.x() + borderLeft() + paddingLeft());
rect.setY(rect.y() + paddingTop() + borderTop());
}
if (!isHorizontalWritingMode())
return rect.transposedRect();
return rect;
}
VisiblePosition RenderBox::positionForPoint(const LayoutPoint& point, const RenderRegion* region)
{
// no children...return this render object's element, if there is one, and offset 0
if (!firstChild())
return createVisiblePosition(nonPseudoElement() ? firstPositionInOrBeforeNode(nonPseudoElement()) : Position());
if (isTable() && nonPseudoElement()) {
LayoutUnit right = contentWidth() + horizontalBorderAndPaddingExtent();
LayoutUnit bottom = contentHeight() + verticalBorderAndPaddingExtent();
if (point.x() < 0 || point.x() > right || point.y() < 0 || point.y() > bottom) {
if (point.x() <= right / 2)
return createVisiblePosition(firstPositionInOrBeforeNode(nonPseudoElement()));
return createVisiblePosition(lastPositionInOrAfterNode(nonPseudoElement()));
}
}
// Pass off to the closest child.
LayoutUnit minDist = LayoutUnit::max();
RenderBox* closestRenderer = nullptr;
LayoutPoint adjustedPoint = point;
if (isTableRow())
adjustedPoint.moveBy(location());
for (RenderObject* renderObject = firstChild(); renderObject; renderObject = renderObject->nextSibling()) {
if (!is<RenderBox>(*renderObject))
continue;
if (is<RenderFlowThread>(*this)) {
ASSERT(region);
if (!downcast<RenderFlowThread>(*this).objectShouldFragmentInFlowRegion(renderObject, region))
continue;
}
auto& renderer = downcast<RenderBox>(*renderObject);
if ((!renderer.firstChild() && !renderer.isInline() && !is<RenderBlockFlow>(renderer))
|| renderer.style().visibility() != VISIBLE)
continue;
LayoutUnit top = renderer.borderTop() + renderer.paddingTop() + (is<RenderTableRow>(*this) ? LayoutUnit() : renderer.y());
LayoutUnit bottom = top + renderer.contentHeight();
LayoutUnit left = renderer.borderLeft() + renderer.paddingLeft() + (is<RenderTableRow>(*this) ? LayoutUnit() : renderer.x());
LayoutUnit right = left + renderer.contentWidth();
if (point.x() <= right && point.x() >= left && point.y() <= top && point.y() >= bottom) {
if (is<RenderTableRow>(renderer))
return renderer.positionForPoint(point + adjustedPoint - renderer.locationOffset(), region);
return renderer.positionForPoint(point - renderer.locationOffset(), region);
}
// Find the distance from (x, y) to the box. Split the space around the box into 8 pieces
// and use a different compare depending on which piece (x, y) is in.
LayoutPoint cmp;
if (point.x() > right) {
if (point.y() < top)
cmp = LayoutPoint(right, top);
else if (point.y() > bottom)
cmp = LayoutPoint(right, bottom);
else
cmp = LayoutPoint(right, point.y());
} else if (point.x() < left) {
if (point.y() < top)
cmp = LayoutPoint(left, top);
else if (point.y() > bottom)
cmp = LayoutPoint(left, bottom);
else
cmp = LayoutPoint(left, point.y());
} else {
if (point.y() < top)
cmp = LayoutPoint(point.x(), top);
else
cmp = LayoutPoint(point.x(), bottom);
}
LayoutSize difference = cmp - point;
LayoutUnit dist = difference.width() * difference.width() + difference.height() * difference.height();
if (dist < minDist) {
closestRenderer = &renderer;
minDist = dist;
}
}
if (closestRenderer)
return closestRenderer->positionForPoint(adjustedPoint - closestRenderer->locationOffset(), region);
return createVisiblePosition(firstPositionInOrBeforeNode(nonPseudoElement()));
}
bool RenderBox::shrinkToAvoidFloats() const
{
// Floating objects don't shrink. Objects that don't avoid floats don't shrink. Marquees don't shrink.
if ((isInline() && !isHTMLMarquee()) || !avoidsFloats() || isFloating())
return false;
// Only auto width objects can possibly shrink to avoid floats.
return style().width().isAuto();
}
bool RenderBox::createsNewFormattingContext() const
{
return (isInlineBlockOrInlineTable() && !isAnonymousInlineBlock()) || isFloatingOrOutOfFlowPositioned() || hasOverflowClip() || isFlexItemIncludingDeprecated()
|| isTableCell() || isTableCaption() || isFieldset() || isWritingModeRoot() || isRoot() || isRenderFlowThread() || isRenderRegion()
#if ENABLE(CSS_GRID_LAYOUT)
|| isGridItem()
#endif
|| style().specifiesColumns() || style().columnSpan();
}
bool RenderBox::avoidsFloats() const
{
return (isReplaced() && !isAnonymousInlineBlock()) || isHR() || isLegend() || createsNewFormattingContext();
}
void RenderBox::addVisualEffectOverflow()
{
if (!style().boxShadow() && !style().hasBorderImageOutsets())
return;
LayoutRect borderBox = borderBoxRect();
addVisualOverflow(applyVisualEffectOverflow(borderBox));
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread)
flowThread->addRegionsVisualEffectOverflow(this);
}
LayoutRect RenderBox::applyVisualEffectOverflow(const LayoutRect& borderBox) const
{
bool isFlipped = style().isFlippedBlocksWritingMode();
bool isHorizontal = isHorizontalWritingMode();
LayoutUnit overflowMinX = borderBox.x();
LayoutUnit overflowMaxX = borderBox.maxX();
LayoutUnit overflowMinY = borderBox.y();
LayoutUnit overflowMaxY = borderBox.maxY();
// Compute box-shadow overflow first.
if (style().boxShadow()) {
LayoutUnit shadowLeft;
LayoutUnit shadowRight;
LayoutUnit shadowTop;
LayoutUnit shadowBottom;
style().getBoxShadowExtent(shadowTop, shadowRight, shadowBottom, shadowLeft);
// In flipped blocks writing modes such as vertical-rl, the physical right shadow value is actually at the lower x-coordinate.
overflowMinX = borderBox.x() + ((!isFlipped || isHorizontal) ? shadowLeft : -shadowRight);
overflowMaxX = borderBox.maxX() + ((!isFlipped || isHorizontal) ? shadowRight : -shadowLeft);
overflowMinY = borderBox.y() + ((!isFlipped || !isHorizontal) ? shadowTop : -shadowBottom);
overflowMaxY = borderBox.maxY() + ((!isFlipped || !isHorizontal) ? shadowBottom : -shadowTop);
}
// Now compute border-image-outset overflow.
if (style().hasBorderImageOutsets()) {
LayoutBoxExtent borderOutsets = style().borderImageOutsets();
// In flipped blocks writing modes, the physical sides are inverted. For example in vertical-rl, the right
// border is at the lower x coordinate value.
overflowMinX = std::min(overflowMinX, borderBox.x() - ((!isFlipped || isHorizontal) ? borderOutsets.left() : borderOutsets.right()));
overflowMaxX = std::max(overflowMaxX, borderBox.maxX() + ((!isFlipped || isHorizontal) ? borderOutsets.right() : borderOutsets.left()));
overflowMinY = std::min(overflowMinY, borderBox.y() - ((!isFlipped || !isHorizontal) ? borderOutsets.top() : borderOutsets.bottom()));
overflowMaxY = std::max(overflowMaxY, borderBox.maxY() + ((!isFlipped || !isHorizontal) ? borderOutsets.bottom() : borderOutsets.top()));
}
// Add in the final overflow with shadows and outsets combined.
return LayoutRect(overflowMinX, overflowMinY, overflowMaxX - overflowMinX, overflowMaxY - overflowMinY);
}
void RenderBox::addOverflowFromChild(RenderBox* child, const LayoutSize& delta)
{
// Never allow flow threads to propagate overflow up to a parent.
if (child->isRenderFlowThread())
return;
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread)
flowThread->addRegionsOverflowFromChild(this, child, delta);
// Only propagate layout overflow from the child if the child isn't clipping its overflow. If it is, then
// its overflow is internal to it, and we don't care about it. layoutOverflowRectForPropagation takes care of this
// and just propagates the border box rect instead.
LayoutRect childLayoutOverflowRect = child->layoutOverflowRectForPropagation(&style());
childLayoutOverflowRect.move(delta);
addLayoutOverflow(childLayoutOverflowRect);
// Add in visual overflow from the child. Even if the child clips its overflow, it may still
// have visual overflow of its own set from box shadows or reflections. It is unnecessary to propagate this
// overflow if we are clipping our own overflow.
if (child->hasSelfPaintingLayer() || hasOverflowClip())
return;
LayoutRect childVisualOverflowRect = child->visualOverflowRectForPropagation(&style());
childVisualOverflowRect.move(delta);
addVisualOverflow(childVisualOverflowRect);
}
void RenderBox::addLayoutOverflow(const LayoutRect& rect)
{
LayoutRect clientBox = flippedClientBoxRect();
if (clientBox.contains(rect) || rect.isEmpty())
return;
// For overflow clip objects, we don't want to propagate overflow into unreachable areas.
LayoutRect overflowRect(rect);
if (hasOverflowClip() || isRenderView()) {
// Overflow is in the block's coordinate space and thus is flipped for horizontal-bt and vertical-rl
// writing modes. At this stage that is actually a simplification, since we can treat horizontal-tb/bt as the same
// and vertical-lr/rl as the same.
bool hasTopOverflow = isTopLayoutOverflowAllowed();
bool hasLeftOverflow = isLeftLayoutOverflowAllowed();
if (!hasTopOverflow)
overflowRect.shiftYEdgeTo(std::max(overflowRect.y(), clientBox.y()));
else
overflowRect.shiftMaxYEdgeTo(std::min(overflowRect.maxY(), clientBox.maxY()));
if (!hasLeftOverflow)
overflowRect.shiftXEdgeTo(std::max(overflowRect.x(), clientBox.x()));
else
overflowRect.shiftMaxXEdgeTo(std::min(overflowRect.maxX(), clientBox.maxX()));
// Now re-test with the adjusted rectangle and see if it has become unreachable or fully
// contained.
if (clientBox.contains(overflowRect) || overflowRect.isEmpty())
return;
}
if (!m_overflow)
m_overflow = adoptRef(new RenderOverflow(clientBox, borderBoxRect()));
m_overflow->addLayoutOverflow(overflowRect);
}
void RenderBox::addVisualOverflow(const LayoutRect& rect)
{
LayoutRect borderBox = borderBoxRect();
if (borderBox.contains(rect) || rect.isEmpty())
return;
if (!m_overflow)
m_overflow = adoptRef(new RenderOverflow(flippedClientBoxRect(), borderBox));
m_overflow->addVisualOverflow(rect);
}
void RenderBox::clearOverflow()
{
m_overflow.clear();
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread)
flowThread->clearRegionsOverflow(this);
}
static bool logicalWidthIsResolvable(const RenderBox& renderBox)
{
const RenderBox* box = &renderBox;
while (!box->isRenderView() && !box->isOutOfFlowPositioned()
#if ENABLE(CSS_GRID_LAYOUT)
&& !box->hasOverrideContainingBlockLogicalWidth()
#endif
&& (box->style().logicalWidth().isAuto() || box->isAnonymousBlock()))
box = box->containingBlock();
if (box->style().logicalWidth().isFixed())
return true;
if (box->isRenderView())
return true;
// The size of the containing block of an absolutely positioned element is always definite with respect to that
// element (http://dev.w3.org/csswg/css-sizing-3/#definite).
if (box->isOutOfFlowPositioned())
return true;
#if ENABLE(CSS_GRID_LAYOUT)
if (box->hasOverrideContainingBlockLogicalWidth())
return box->overrideContainingBlockContentLogicalWidth() != -1;
#endif
if (box->style().logicalWidth().isPercentOrCalculated())
return logicalWidthIsResolvable(*box->containingBlock());
return false;
}
bool RenderBox::hasDefiniteLogicalWidth() const
{
return logicalWidthIsResolvable(*this);
}
inline static bool percentageLogicalHeightIsResolvable(const RenderBox* box)
{
return RenderBox::percentageLogicalHeightIsResolvableFromBlock(box->containingBlock(), box->isOutOfFlowPositioned());
}
bool RenderBox::percentageLogicalHeightIsResolvableFromBlock(const RenderBlock* containingBlock, bool isOutOfFlowPositioned)
{
// In quirks mode, blocks with auto height are skipped, and we keep looking for an enclosing
// block that may have a specified height and then use it. In strict mode, this violates the
// specification, which states that percentage heights just revert to auto if the containing
// block has an auto height. We still skip anonymous containing blocks in both modes, though, and look
// only at explicit containers.
const RenderBlock* cb = containingBlock;
bool inQuirksMode = cb->document().inQuirksMode();
while (!cb->isRenderView() && !cb->isBody() && !cb->isTableCell() && !cb->isOutOfFlowPositioned() && cb->style().logicalHeight().isAuto()) {
if (!inQuirksMode && !cb->isAnonymousBlock())
break;
#if ENABLE(CSS_GRID_LAYOUT)
if (cb->hasOverrideContainingBlockLogicalHeight())
return cb->overrideContainingBlockContentLogicalHeight() != -1;
#endif
cb = cb->containingBlock();
}
// A positioned element that specified both top/bottom or that specifies height should be treated as though it has a height
// explicitly specified that can be used for any percentage computations.
// FIXME: We can't just check top/bottom here.
// https://bugs.webkit.org/show_bug.cgi?id=46500
bool isOutOfFlowPositionedWithSpecifiedHeight = cb->isOutOfFlowPositioned() && (!cb->style().logicalHeight().isAuto() || (!cb->style().top().isAuto() && !cb->style().bottom().isAuto()));
// Table cells violate what the CSS spec says to do with heights. Basically we
// don't care if the cell specified a height or not. We just always make ourselves
// be a percentage of the cell's current content height.
if (cb->isTableCell())
return true;
// Otherwise we only use our percentage height if our containing block had a specified
// height.
if (cb->style().logicalHeight().isFixed())
return true;
if (cb->style().logicalHeight().isPercentOrCalculated() && !isOutOfFlowPositionedWithSpecifiedHeight)
return percentageLogicalHeightIsResolvableFromBlock(cb->containingBlock(), cb->isOutOfFlowPositioned());
if (cb->isRenderView() || inQuirksMode || isOutOfFlowPositionedWithSpecifiedHeight)
return true;
if (cb->isRoot() && isOutOfFlowPositioned) {
// Match the positioned objects behavior, which is that positioned objects will fill their viewport
// always. Note we could only hit this case by recurring into computePercentageLogicalHeight on a positioned containing block.
return true;
}
return false;
}
bool RenderBox::hasDefiniteLogicalHeight() const
{
const Length& logicalHeight = style().logicalHeight();
if (logicalHeight.isFixed())
return true;
// The size of the containing block of an absolutely positioned element is always definite with respect to that
// element (http://dev.w3.org/csswg/css-sizing-3/#definite).
if (isOutOfFlowPositioned())
return true;
#if ENABLE(CSS_GRID_LAYOUT)
if (hasOverrideContainingBlockLogicalHeight())
return overrideContainingBlockContentLogicalHeight() != -1;
#endif
if (logicalHeight.isIntrinsicOrAuto())
return false;
return percentageLogicalHeightIsResolvable(this);
}
bool RenderBox::hasUnsplittableScrollingOverflow() const
{
// We will paginate as long as we don't scroll overflow in the pagination direction.
bool isHorizontal = isHorizontalWritingMode();
if ((isHorizontal && !scrollsOverflowY()) || (!isHorizontal && !scrollsOverflowX()))
return false;
// We do have overflow. We'll still be willing to paginate as long as the block
// has auto logical height, auto or undefined max-logical-height and a zero or auto min-logical-height.
// Note this is just a heuristic, and it's still possible to have overflow under these
// conditions, but it should work out to be good enough for common cases. Paginating overflow
// with scrollbars present is not the end of the world and is what we used to do in the old model anyway.
return !style().logicalHeight().isIntrinsicOrAuto()
|| (!style().logicalMaxHeight().isIntrinsicOrAuto() && !style().logicalMaxHeight().isUndefined() && (!style().logicalMaxHeight().isPercentOrCalculated() || percentageLogicalHeightIsResolvable(this)))
|| (!style().logicalMinHeight().isIntrinsicOrAuto() && style().logicalMinHeight().isPositive() && (!style().logicalMinHeight().isPercentOrCalculated() || percentageLogicalHeightIsResolvable(this)));
}
bool RenderBox::isUnsplittableForPagination() const
{
return isReplaced()
|| hasUnsplittableScrollingOverflow()
|| (parent() && isWritingModeRoot())
|| isRenderNamedFlowFragmentContainer()
|| fixedPositionedWithNamedFlowContainingBlock();
}
LayoutUnit RenderBox::lineHeight(bool /*firstLine*/, LineDirectionMode direction, LinePositionMode /*linePositionMode*/) const
{
if (isReplaced())
return direction == HorizontalLine ? m_marginBox.top() + height() + m_marginBox.bottom() : m_marginBox.right() + width() + m_marginBox.left();
return 0;
}
int RenderBox::baselinePosition(FontBaseline baselineType, bool /*firstLine*/, LineDirectionMode direction, LinePositionMode /*linePositionMode*/) const
{
if (isReplaced()) {
int result = direction == HorizontalLine ? m_marginBox.top() + height() + m_marginBox.bottom() : m_marginBox.right() + width() + m_marginBox.left();
if (baselineType == AlphabeticBaseline)
return result;
return result - result / 2;
}
return 0;
}
RenderLayer* RenderBox::enclosingFloatPaintingLayer() const
{
for (auto& box : lineageOfType<RenderBox>(*this)) {
if (box.layer() && box.layer()->isSelfPaintingLayer())
return box.layer();
}
return nullptr;
}
LayoutRect RenderBox::logicalVisualOverflowRectForPropagation(RenderStyle* parentStyle) const
{
LayoutRect rect = visualOverflowRectForPropagation(parentStyle);
if (!parentStyle->isHorizontalWritingMode())
return rect.transposedRect();
return rect;
}
LayoutRect RenderBox::visualOverflowRectForPropagation(RenderStyle* parentStyle) const
{
// If the writing modes of the child and parent match, then we don't have to
// do anything fancy. Just return the result.
LayoutRect rect = visualOverflowRect();
if (parentStyle->writingMode() == style().writingMode())
return rect;
// We are putting ourselves into our parent's coordinate space. If there is a flipped block mismatch
// in a particular axis, then we have to flip the rect along that axis.
if (style().writingMode() == RightToLeftWritingMode || parentStyle->writingMode() == RightToLeftWritingMode)
rect.setX(width() - rect.maxX());
else if (style().writingMode() == BottomToTopWritingMode || parentStyle->writingMode() == BottomToTopWritingMode)
rect.setY(height() - rect.maxY());
return rect;
}
LayoutRect RenderBox::logicalLayoutOverflowRectForPropagation(RenderStyle* parentStyle) const
{
LayoutRect rect = layoutOverflowRectForPropagation(parentStyle);
if (!parentStyle->isHorizontalWritingMode())
return rect.transposedRect();
return rect;
}
LayoutRect RenderBox::layoutOverflowRectForPropagation(RenderStyle* parentStyle) const
{
// Only propagate interior layout overflow if we don't clip it.
LayoutRect rect = borderBoxRect();
if (!hasOverflowClip())
rect.unite(layoutOverflowRect());
bool hasTransform = this->hasTransform();
#if PLATFORM(IOS)
if (isInFlowPositioned() || (hasTransform && document().settings()->shouldTransformsAffectOverflow())) {
#else
if (isInFlowPositioned() || hasTransform) {
#endif
// If we are relatively positioned or if we have a transform, then we have to convert
// this rectangle into physical coordinates, apply relative positioning and transforms
// to it, and then convert it back.
flipForWritingMode(rect);
if (hasTransform)
rect = layer()->currentTransform().mapRect(rect);
if (isInFlowPositioned())
rect.move(offsetForInFlowPosition());
// Now we need to flip back.
flipForWritingMode(rect);
}
// If the writing modes of the child and parent match, then we don't have to
// do anything fancy. Just return the result.
if (parentStyle->writingMode() == style().writingMode())
return rect;
// We are putting ourselves into our parent's coordinate space. If there is a flipped block mismatch
// in a particular axis, then we have to flip the rect along that axis.
if (style().writingMode() == RightToLeftWritingMode || parentStyle->writingMode() == RightToLeftWritingMode)
rect.setX(width() - rect.maxX());
else if (style().writingMode() == BottomToTopWritingMode || parentStyle->writingMode() == BottomToTopWritingMode)
rect.setY(height() - rect.maxY());
return rect;
}
LayoutRect RenderBox::flippedClientBoxRect() const
{
// Because of the special coordinate system used for overflow rectangles (not quite logical, not
// quite physical), we need to flip the block progression coordinate in vertical-rl and
// horizontal-bt writing modes. Apart from that, this method does the same as clientBoxRect().
LayoutUnit left = borderLeft();
LayoutUnit top = borderTop();
LayoutUnit right = borderRight();
LayoutUnit bottom = borderBottom();
// Calculate physical padding box.
LayoutRect rect(left, top, width() - left - right, height() - top - bottom);
// Flip block progression axis if writing mode is vertical-rl or horizontal-bt.
flipForWritingMode(rect);
// Subtract space occupied by scrollbars. They are at their physical edge in this coordinate
// system, so order is important here: first flip, then subtract scrollbars.
rect.contract(verticalScrollbarWidth(), horizontalScrollbarHeight());
return rect;
}
LayoutRect RenderBox::overflowRectForPaintRejection(RenderNamedFlowFragment* namedFlowFragment) const
{
LayoutRect overflowRect = visualOverflowRect();
// When using regions, some boxes might have their frame rect relative to the flow thread, which could
// cause the paint rejection algorithm to prevent them from painting when using different width regions.
// e.g. an absolutely positioned box with bottom:0px and right:0px would have it's frameRect.x relative
// to the flow thread, not the last region (in which it will end up because of bottom:0px)
if (namedFlowFragment && namedFlowFragment->isValid()) {
RenderFlowThread* flowThread = namedFlowFragment->flowThread();
RenderRegion* startRegion = nullptr;
RenderRegion* endRegion = nullptr;
if (flowThread->getRegionRangeForBox(this, startRegion, endRegion))
overflowRect.unite(namedFlowFragment->visualOverflowRectForBox(*this));
}
if (!m_overflow || !usesCompositedScrolling())
return overflowRect;
overflowRect.unite(layoutOverflowRect());
overflowRect.move(-scrolledContentOffset());
return overflowRect;
}
LayoutUnit RenderBox::offsetLeft() const
{
return adjustedPositionRelativeToOffsetParent(topLeftLocation()).x();
}
LayoutUnit RenderBox::offsetTop() const
{
return adjustedPositionRelativeToOffsetParent(topLeftLocation()).y();
}
LayoutPoint RenderBox::flipForWritingModeForChild(const RenderBox* child, const LayoutPoint& point) const
{
if (!style().isFlippedBlocksWritingMode())
return point;
// The child is going to add in its x() and y(), so we have to make sure it ends up in
// the right place.
if (isHorizontalWritingMode())
return LayoutPoint(point.x(), point.y() + height() - child->height() - (2 * child->y()));
return LayoutPoint(point.x() + width() - child->width() - (2 * child->x()), point.y());
}
void RenderBox::flipForWritingMode(LayoutRect& rect) const
{
if (!style().isFlippedBlocksWritingMode())
return;
if (isHorizontalWritingMode())
rect.setY(height() - rect.maxY());
else
rect.setX(width() - rect.maxX());
}
LayoutUnit RenderBox::flipForWritingMode(LayoutUnit position) const
{
if (!style().isFlippedBlocksWritingMode())
return position;
return logicalHeight() - position;
}
LayoutPoint RenderBox::flipForWritingMode(const LayoutPoint& position) const
{
if (!style().isFlippedBlocksWritingMode())
return position;
return isHorizontalWritingMode() ? LayoutPoint(position.x(), height() - position.y()) : LayoutPoint(width() - position.x(), position.y());
}
LayoutSize RenderBox::flipForWritingMode(const LayoutSize& offset) const
{
if (!style().isFlippedBlocksWritingMode())
return offset;
return isHorizontalWritingMode() ? LayoutSize(offset.width(), height() - offset.height()) : LayoutSize(width() - offset.width(), offset.height());
}
FloatPoint RenderBox::flipForWritingMode(const FloatPoint& position) const
{
if (!style().isFlippedBlocksWritingMode())
return position;
return isHorizontalWritingMode() ? FloatPoint(position.x(), height() - position.y()) : FloatPoint(width() - position.x(), position.y());
}
void RenderBox::flipForWritingMode(FloatRect& rect) const
{
if (!style().isFlippedBlocksWritingMode())
return;
if (isHorizontalWritingMode())
rect.setY(height() - rect.maxY());
else
rect.setX(width() - rect.maxX());
}
LayoutPoint RenderBox::topLeftLocation() const
{
if (!view().frameView().hasFlippedBlockRenderers())
return location();
RenderBlock* containerBlock = containingBlock();
if (!containerBlock || containerBlock == this)
return location();
return containerBlock->flipForWritingModeForChild(this, location());
}
LayoutSize RenderBox::topLeftLocationOffset() const
{
if (!view().frameView().hasFlippedBlockRenderers())
return locationOffset();
RenderBlock* containerBlock = containingBlock();
if (!containerBlock || containerBlock == this)
return locationOffset();
LayoutRect rect(frameRect());
containerBlock->flipForWritingMode(rect); // FIXME: This is wrong if we are an absolutely positioned object enclosed by a relative-positioned inline.
return LayoutSize(rect.x(), rect.y());
}
void RenderBox::applyTopLeftLocationOffsetWithFlipping(LayoutPoint& point) const
{
RenderBlock* containerBlock = containingBlock();
if (!containerBlock || containerBlock == this) {
point.move(m_frameRect.x(), m_frameRect.y());
return;
}
LayoutRect rect(frameRect());
containerBlock->flipForWritingMode(rect); // FIXME: This is wrong if we are an absolutely positioned object enclosed by a relative-positioned inline.
point.move(rect.x(), rect.y());
}
bool RenderBox::hasRelativeDimensions() const
{
return style().height().isPercentOrCalculated() || style().width().isPercentOrCalculated()
|| style().maxHeight().isPercentOrCalculated() || style().maxWidth().isPercentOrCalculated()
|| style().minHeight().isPercentOrCalculated() || style().minWidth().isPercentOrCalculated();
}
bool RenderBox::hasRelativeLogicalHeight() const
{
return style().logicalHeight().isPercentOrCalculated()
|| style().logicalMinHeight().isPercentOrCalculated()
|| style().logicalMaxHeight().isPercentOrCalculated();
}
bool RenderBox::hasRelativeLogicalWidth() const
{
return style().logicalWidth().isPercentOrCalculated()
|| style().logicalMinWidth().isPercentOrCalculated()
|| style().logicalMaxWidth().isPercentOrCalculated();
}
static void markBoxForRelayoutAfterSplit(RenderBox& box)
{
// FIXME: The table code should handle that automatically. If not,
// we should fix it and remove the table part checks.
if (is<RenderTable>(box)) {
// Because we may have added some sections with already computed column structures, we need to
// sync the table structure with them now. This avoids crashes when adding new cells to the table.
downcast<RenderTable>(box).forceSectionsRecalc();
} else if (is<RenderTableSection>(box))
downcast<RenderTableSection>(box).setNeedsCellRecalc();
box.setNeedsLayoutAndPrefWidthsRecalc();
}
RenderObject* RenderBox::splitAnonymousBoxesAroundChild(RenderObject* beforeChild)
{
bool didSplitParentAnonymousBoxes = false;
while (beforeChild->parent() != this) {
auto& boxToSplit = downcast<RenderBox>(*beforeChild->parent());
if (boxToSplit.firstChild() != beforeChild && boxToSplit.isAnonymous()) {
didSplitParentAnonymousBoxes = true;
// We have to split the parent box into two boxes and move children
// from |beforeChild| to end into the new post box.
RenderBox* postBox = boxToSplit.createAnonymousBoxWithSameTypeAs(this);
postBox->setChildrenInline(boxToSplit.childrenInline());
RenderBox* parentBox = downcast<RenderBox>(boxToSplit.parent());
// We need to invalidate the |parentBox| before inserting the new node
// so that the table repainting logic knows the structure is dirty.
// See for example RenderTableCell:clippedOverflowRectForRepaint.
markBoxForRelayoutAfterSplit(*parentBox);
parentBox->insertChildInternal(postBox, boxToSplit.nextSibling(), NotifyChildren);
boxToSplit.moveChildrenTo(postBox, beforeChild, nullptr, true);
markBoxForRelayoutAfterSplit(boxToSplit);
markBoxForRelayoutAfterSplit(*postBox);
beforeChild = postBox;
} else
beforeChild = &boxToSplit;
}
if (didSplitParentAnonymousBoxes)
markBoxForRelayoutAfterSplit(*this);
ASSERT(beforeChild->parent() == this);
return beforeChild;
}
LayoutUnit RenderBox::offsetFromLogicalTopOfFirstPage() const
{
LayoutState* layoutState = view().layoutState();
if ((layoutState && !layoutState->isPaginated()) || (!layoutState && !flowThreadContainingBlock()))
return 0;
RenderBlock* containerBlock = containingBlock();
return containerBlock->offsetFromLogicalTopOfFirstPage() + logicalTop();
}
const RenderBox* RenderBox::findEnclosingScrollableContainer() const
{
for (auto& candidate : lineageOfType<RenderBox>(*this)) {
if (candidate.hasOverflowClip())
return &candidate;
}
return nullptr;
}
} // namespace WebCore