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mojo / mojo-tools / c09b473ba58ae1f5c82731a9720feb1c85a74575 / . / sky / engine / core / rendering / RenderBox.cpp
blob: 4c803e874a12a4771ff22c519479e2703c9ad406 [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, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2013 Adobe Systems Incorporated. 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 "sky/engine/config.h"
#include "sky/engine/core/rendering/RenderBox.h"
#include <math.h>
#include <algorithm>
#include "sky/engine/core/dom/Document.h"
#include "sky/engine/core/editing/htmlediting.h"
#include "sky/engine/core/frame/FrameHost.h"
#include "sky/engine/core/frame/FrameView.h"
#include "sky/engine/core/frame/LocalFrame.h"
#include "sky/engine/core/frame/Settings.h"
#include "sky/engine/core/html/HTMLElement.h"
#include "sky/engine/core/page/AutoscrollController.h"
#include "sky/engine/core/page/EventHandler.h"
#include "sky/engine/core/page/Page.h"
#include "sky/engine/core/rendering/HitTestResult.h"
#include "sky/engine/core/rendering/PaintInfo.h"
#include "sky/engine/core/rendering/RenderFlexibleBox.h"
#include "sky/engine/core/rendering/RenderGeometryMap.h"
#include "sky/engine/core/rendering/RenderInline.h"
#include "sky/engine/core/rendering/RenderLayer.h"
#include "sky/engine/core/rendering/RenderView.h"
#include "sky/engine/platform/LengthFunctions.h"
#include "sky/engine/platform/geometry/FloatQuad.h"
#include "sky/engine/platform/geometry/TransformState.h"
#include "sky/engine/platform/graphics/GraphicsContextStateSaver.h"
namespace blink {
// Size of border belt for autoscroll. When mouse pointer in border belt,
// autoscroll is started.
static const int autoscrollBeltSize = 20;
RenderBox::RenderBox(ContainerNode* node)
: RenderBoxModelObject(node)
, m_intrinsicContentLogicalHeight(-1)
, m_minPreferredLogicalWidth(-1)
, m_maxPreferredLogicalWidth(-1)
{
setIsBox();
}
void RenderBox::willBeDestroyed()
{
clearOverrideSize();
RenderBlock::removePercentHeightDescendantIfNeeded(this);
RenderBoxModelObject::willBeDestroyed();
}
void RenderBox::removeFloatingOrPositionedChildFromBlockLists()
{
ASSERT(isFloatingOrOutOfFlowPositioned());
if (documentBeingDestroyed())
return;
if (isOutOfFlowPositioned())
RenderBlock::removePositionedObject(this);
}
void RenderBox::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
{
RenderStyle* oldStyle = style();
if (oldStyle) {
// 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.needsFullLayout() && parent() && oldStyle->position() != newStyle.position()) {
markContainingBlocksForLayout();
if (newStyle.hasOutOfFlowPosition())
parent()->setChildNeedsLayout();
}
}
RenderBoxModelObject::styleWillChange(diff, newStyle);
}
void RenderBox::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
RenderBoxModelObject::styleDidChange(diff, oldStyle);
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() && oldStyle->marginBefore() != newStyle->marginBefore()
&& parent() && !parent()->normalChildNeedsLayout())
parent()->setChildNeedsLayout();
}
}
void RenderBox::updateFromStyle()
{
RenderBoxModelObject::updateFromStyle();
RenderStyle* styleToUse = style();
bool isRootObject = isDocumentElement();
bool isViewObject = isRenderView();
// The root and the RenderView always paint their backgrounds/borders.
if (isRootObject || isViewObject)
setHasBoxDecorationBackground(true);
// TODO(esprehn): Why do we not want to set this on the RenderView?
if (isRenderBlock() && !isViewObject)
setHasOverflowClip(!styleToUse->isOverflowVisible());
setHasTransform(styleToUse->hasTransformRelatedProperty());
}
void RenderBox::layout()
{
ASSERT(needsLayout());
RenderObject* child = slowFirstChild();
if (!child) {
clearNeedsLayout();
return;
}
LayoutState state(*this, locationOffset());
while (child) {
child->layoutIfNeeded();
ASSERT(!child->needsLayout());
child = child->nextSibling();
}
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();
}
LayoutUnit RenderBox::clientHeight() const
{
return height() - borderTop() - borderBottom();
}
int RenderBox::pixelSnappedClientWidth() const
{
return snapSizeToPixel(clientWidth(), x() + clientLeft());
}
int RenderBox::pixelSnappedClientHeight() const
{
return snapSizeToPixel(clientHeight(), y() + clientTop());
}
int RenderBox::pixelSnappedOffsetWidth() const
{
return snapSizeToPixel(offsetWidth(), x() + clientLeft());
}
int RenderBox::pixelSnappedOffsetHeight() const
{
return snapSizeToPixel(offsetHeight(), y() + clientTop());
}
LayoutUnit RenderBox::scrollWidth() const
{
if (hasOverflowClip())
return layer()->scrollableArea()->scrollWidth();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
if (style()->isLeftToRightDirection())
return std::max(clientWidth(), layoutOverflowRect().maxX() - borderLeft());
return clientWidth() - std::min<LayoutUnit>(0, layoutOverflowRect().x() - borderLeft());
}
LayoutUnit RenderBox::scrollHeight() const
{
if (hasOverflowClip())
return layer()->scrollableArea()->scrollHeight();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
return std::max(clientHeight(), layoutOverflowRect().maxY() - borderTop());
}
LayoutUnit RenderBox::scrollLeft() const
{
return hasOverflowClip() ? layer()->scrollableArea()->scrollXOffset() : 0;
}
LayoutUnit RenderBox::scrollTop() const
{
return hasOverflowClip() ? layer()->scrollableArea()->scrollYOffset() : 0;
}
int RenderBox::pixelSnappedScrollWidth() const
{
return snapSizeToPixel(scrollWidth(), x() + clientLeft());
}
int RenderBox::pixelSnappedScrollHeight() const
{
if (hasOverflowClip())
return layer()->scrollableArea()->scrollHeight();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
return snapSizeToPixel(scrollHeight(), y() + clientTop());
}
void RenderBox::setScrollLeft(LayoutUnit newLeft)
{
if (hasOverflowClip())
layer()->scrollableArea()->scrollToXOffset(newLeft, ScrollOffsetClamped);
}
void RenderBox::setScrollTop(LayoutUnit newTop)
{
if (hasOverflowClip())
layer()->scrollableArea()->scrollToYOffset(newTop, ScrollOffsetClamped);
}
void RenderBox::scrollToOffset(const IntSize& offset)
{
ASSERT(hasOverflowClip());
layer()->scrollableArea()->scrollToOffset(offset, ScrollOffsetClamped);
}
void RenderBox::scrollRectToVisible(const LayoutRect& rect, const ScrollAlignment& alignX, const ScrollAlignment& alignY)
{
RenderBox* parentBox = 0;
LayoutRect newRect = rect;
if (parent()) {
parentBox = parent()->enclosingBox();
}
if (hasOverflowClip()) {
// Don't scroll to reveal an overflow layer that is restricted by the -webkit-line-clamp property.
// This will prevent us from revealing text hidden by the slider in Safari RSS.
newRect = layer()->scrollableArea()->exposeRect(rect, alignX, alignY);
}
if (frame()->page()->autoscrollController().autoscrollInProgress())
parentBox = enclosingScrollableBox();
if (parentBox)
parentBox->scrollRectToVisible(newRect, alignX, alignY);
}
void RenderBox::absoluteRects(Vector<IntRect>& rects, const LayoutPoint& accumulatedOffset) const
{
rects.append(pixelSnappedIntRect(accumulatedOffset, size()));
}
void RenderBox::absoluteQuads(Vector<FloatQuad>& quads) const
{
quads.append(localToAbsoluteQuad(FloatRect(0, 0, width().toFloat(), height().toFloat()), 0 /* mode */));
}
void RenderBox::updateLayerTransformAfterLayout()
{
// Transform-origin depends on box size, so we need to update the layer transform after layout.
if (hasLayer())
layer()->updateTransformationMatrix();
}
LayoutUnit RenderBox::constrainLogicalWidthByMinMax(LayoutUnit logicalWidth, LayoutUnit availableWidth, RenderBlock* cb) const
{
RenderStyle* styleToUse = style();
if (!styleToUse->logicalMaxWidth().isMaxSizeNone())
logicalWidth = std::min(logicalWidth, computeLogicalWidthUsing(MaxSize, styleToUse->logicalMaxWidth(), availableWidth, cb));
return std::max(logicalWidth, computeLogicalWidthUsing(MinSize, styleToUse->logicalMinWidth(), availableWidth, cb));
}
LayoutUnit RenderBox::constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const
{
RenderStyle* styleToUse = style();
if (!styleToUse->logicalMaxHeight().isMaxSizeNone()) {
LayoutUnit maxH = computeLogicalHeightUsing(styleToUse->logicalMaxHeight(), intrinsicContentHeight);
if (maxH != -1)
logicalHeight = std::min(logicalHeight, maxH);
}
return std::max(logicalHeight, computeLogicalHeightUsing(styleToUse->logicalMinHeight(), intrinsicContentHeight));
}
LayoutUnit RenderBox::constrainContentBoxLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const
{
RenderStyle* styleToUse = style();
if (!styleToUse->logicalMaxHeight().isMaxSizeNone()) {
LayoutUnit maxH = computeContentLogicalHeight(styleToUse->logicalMaxHeight(), intrinsicContentHeight);
if (maxH != -1)
logicalHeight = std::min(logicalHeight, maxH);
}
return std::max(logicalHeight, computeContentLogicalHeight(styleToUse->logicalMinHeight(), intrinsicContentHeight));
}
IntRect RenderBox::absoluteContentBox() const
{
// This is wrong with transforms and flipped writing modes.
IntRect rect = pixelSnappedIntRect(contentBoxRect());
FloatPoint absPos = localToAbsolute();
rect.move(absPos.x(), absPos.y());
return rect;
}
FloatQuad RenderBox::absoluteContentQuad() const
{
LayoutRect rect = contentBoxRect();
return localToAbsoluteQuad(FloatRect(rect));
}
void RenderBox::addFocusRingRects(Vector<IntRect>& rects, const LayoutPoint& additionalOffset, const RenderLayerModelObject*) const
{
if (!size().isEmpty())
rects.append(pixelSnappedIntRect(additionalOffset, size()));
}
bool RenderBox::scroll(ScrollDirection direction, ScrollGranularity granularity, float delta)
{
if (!layer() || !layer()->scrollableArea())
return false;
return layer()->scrollableArea()->scroll(direction, granularity, delta);
}
bool RenderBox::canBeScrolledAndHasScrollableArea() const
{
return canBeProgramaticallyScrolled() && (pixelSnappedScrollHeight() != pixelSnappedClientHeight() || pixelSnappedScrollWidth() != pixelSnappedClientWidth());
}
bool RenderBox::canBeProgramaticallyScrolled() const
{
Node* node = this->node();
if (node && node->isDocumentNode())
return true;
if (!hasOverflowClip())
return false;
bool hasScrollableOverflow = hasScrollableOverflowX() || hasScrollableOverflowY();
if (scrollsOverflow() && hasScrollableOverflow)
return true;
return node && node->hasEditableStyle();
}
void RenderBox::autoscroll(const IntPoint& position)
{
LocalFrame* frame = this->frame();
if (!frame)
return;
FrameView* frameView = frame->view();
if (!frameView)
return;
IntPoint currentDocumentPosition = frameView->windowToContents(position);
scrollRectToVisible(LayoutRect(currentDocumentPosition, LayoutSize(1, 1)), ScrollAlignment::alignToEdgeIfNeeded, ScrollAlignment::alignToEdgeIfNeeded);
}
bool RenderBox::autoscrollInProgress() const
{
return frame() && frame()->page() && frame()->page()->autoscrollController().autoscrollInProgress(this);
}
// FIXME(sky): Replace with canBeScrolledAndHasScrollableArea.
bool RenderBox::canAutoscroll() const
{
return canBeScrolledAndHasScrollableArea();
}
// If specified point is in border belt, returned offset denotes direction of
// scrolling.
IntSize RenderBox::calculateAutoscrollDirection(const IntPoint& windowPoint) const
{
if (!frame())
return IntSize();
FrameView* frameView = frame()->view();
if (!frameView)
return IntSize();
IntRect box(absoluteBoundingBoxRect());
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 && !(renderer->isBox() && toRenderBox(renderer)->canAutoscroll())) {
renderer = renderer->parent();
}
return renderer && renderer->isBox() ? toRenderBox(renderer) : 0;
}
void RenderBox::scrollByRecursively(const IntSize& delta, ScrollOffsetClamping clamp)
{
if (delta.isZero())
return;
if (hasOverflowClip()) {
IntSize newScrollOffset = layer()->scrollableArea()->adjustedScrollOffset() + delta;
layer()->scrollableArea()->scrollToOffset(newScrollOffset, clamp);
// If this layer can't do the scroll we ask the next layer up that can scroll to try
IntSize remainingScrollOffset = newScrollOffset - layer()->scrollableArea()->adjustedScrollOffset();
if (!remainingScrollOffset.isZero() && parent()) {
if (RenderBox* scrollableBox = enclosingScrollableBox())
scrollableBox->scrollByRecursively(remainingScrollOffset, clamp);
LocalFrame* frame = this->frame();
if (frame && frame->page())
frame->page()->autoscrollController().updateAutoscrollRenderer();
}
}
}
bool RenderBox::needsPreferredWidthsRecalculation() const
{
return style()->paddingStart().isPercent() || style()->paddingEnd().isPercent();
}
IntSize RenderBox::scrolledContentOffset() const
{
ASSERT(hasOverflowClip());
ASSERT(hasLayer());
return layer()->scrollableArea()->scrollOffset();
}
void RenderBox::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
minLogicalWidth = minPreferredLogicalWidth() - borderAndPaddingLogicalWidth();
maxLogicalWidth = maxPreferredLogicalWidth() - borderAndPaddingLogicalWidth();
}
LayoutUnit RenderBox::minPreferredLogicalWidth() const
{
if (preferredLogicalWidthsDirty()) {
#if ENABLE(ASSERT)
SetLayoutNeededForbiddenScope layoutForbiddenScope(const_cast<RenderBox&>(*this));
#endif
const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
}
return m_minPreferredLogicalWidth;
}
LayoutUnit RenderBox::maxPreferredLogicalWidth() const
{
if (preferredLogicalWidthsDirty()) {
#if ENABLE(ASSERT)
SetLayoutNeededForbiddenScope layoutForbiddenScope(const_cast<RenderBox&>(*this));
#endif
const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
}
return m_maxPreferredLogicalWidth;
}
bool RenderBox::hasOverrideHeight() const
{
return m_rareData && m_rareData->m_overrideLogicalContentHeight != -1;
}
bool RenderBox::hasOverrideWidth() const
{
return m_rareData && m_rareData->m_overrideLogicalContentWidth != -1;
}
void RenderBox::setOverrideLogicalContentHeight(LayoutUnit height)
{
ASSERT(height >= 0);
ensureRareData().m_overrideLogicalContentHeight = height;
}
void RenderBox::setOverrideLogicalContentWidth(LayoutUnit width)
{
ASSERT(width >= 0);
ensureRareData().m_overrideLogicalContentWidth = width;
}
void RenderBox::clearOverrideLogicalContentHeight()
{
if (m_rareData)
m_rareData->m_overrideLogicalContentHeight = -1;
}
void RenderBox::clearOverrideLogicalContentWidth()
{
if (m_rareData)
m_rareData->m_overrideLogicalContentWidth = -1;
}
void RenderBox::clearOverrideSize()
{
clearOverrideLogicalContentHeight();
clearOverrideLogicalContentWidth();
}
LayoutUnit RenderBox::overrideLogicalContentWidth() const
{
ASSERT(hasOverrideWidth());
return m_rareData->m_overrideLogicalContentWidth;
}
LayoutUnit RenderBox::overrideLogicalContentHeight() const
{
ASSERT(hasOverrideHeight());
return m_rareData->m_overrideLogicalContentHeight;
}
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);
}
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 = slowLastChild(); child; child = child->previousSibling()) {
if ((!child->hasLayer() || !toRenderLayerModelObject(child)->layer()->isSelfPaintingLayer()) && child->nodeAtPoint(request, result, locationInContainer, adjustedLocation, action)) {
updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
return true;
}
}
// 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 = borderBoxRect();
boundsRect.moveBy(adjustedLocation);
if (visibleToHitTestRequest(request) && action == HitTestForeground && locationInContainer.intersects(boundsRect)) {
updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
if (!result.addNodeToRectBasedTestResult(node(), request, locationInContainer, boundsRect))
return true;
}
return false;
}
// --------------------- painting stuff -------------------------------
void RenderBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
LayoutPoint adjustedPaintOffset = paintOffset + location();
// default implementation. Just pass paint through to the children
PaintInfo childInfo(paintInfo);
childInfo.updatePaintingRootForChildren(this);
for (RenderObject* child = slowFirstChild(); child; child = child->nextSibling())
child->paint(childInfo, adjustedPaintOffset);
}
void RenderBox::paintRootBoxFillLayers(const PaintInfo& paintInfo)
{
const FillLayer& bgLayer = style()->backgroundLayers();
Color bgColor = resolveColor(CSSPropertyBackgroundColor);
paintFillLayers(paintInfo, bgColor, bgLayer, view()->backgroundRect(this), BackgroundBleedNone, this);
}
BackgroundBleedAvoidance RenderBox::determineBackgroundBleedAvoidance(GraphicsContext* context, const BoxDecorationData& boxDecorationData) const
{
if (!boxDecorationData.hasBackground || !boxDecorationData.hasBorder || !style()->hasBorderRadius() || canRenderBorderImage())
return BackgroundBleedNone;
// FIXME: See crbug.com/382491. getCTM does not accurately reflect the scale at the time content is
// rasterized, and should not be relied on to make decisions about bleeding.
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 (borderObscuresBackground() && backgroundHasOpaqueTopLayer())
return BackgroundBleedBackgroundOverBorder;
return BackgroundBleedClipBackground;
}
void RenderBox::paintBoxDecorationBackground(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(this))
return;
LayoutRect paintRect = borderBoxRect();
paintRect.moveBy(paintOffset);
paintBoxDecorationBackgroundWithRect(paintInfo, paintOffset, paintRect);
}
void RenderBox::paintBoxDecorationBackgroundWithRect(PaintInfo& paintInfo, const LayoutPoint& paintOffset, const LayoutRect& paintRect)
{
RenderStyle* style = this->style();
BoxDecorationData boxDecorationData(*style);
BackgroundBleedAvoidance bleedAvoidance = determineBackgroundBleedAvoidance(paintInfo.context, boxDecorationData);
// 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(bleedAvoidance))
paintBoxShadow(paintInfo, paintRect, style, Normal);
GraphicsContextStateSaver stateSaver(*paintInfo.context, false);
if (bleedAvoidance == BackgroundBleedClipBackground) {
stateSaver.save();
RoundedRect border = style->getRoundedBorderFor(paintRect);
paintInfo.context->clipRoundedRect(border);
}
if (bleedAvoidance == BackgroundBleedBackgroundOverBorder)
paintBorder(paintInfo, paintRect, style, bleedAvoidance);
paintBackground(paintInfo, paintRect, boxDecorationData.backgroundColor, bleedAvoidance);
paintBoxShadow(paintInfo, paintRect, style, Inset);
// The theme will tell us whether or not we should also paint the CSS border.
if (boxDecorationData.hasBorder && bleedAvoidance != BackgroundBleedBackgroundOverBorder)
paintBorder(paintInfo, paintRect, style, bleedAvoidance);
}
void RenderBox::paintBackground(const PaintInfo& paintInfo, const LayoutRect& paintRect, const Color& backgroundColor, BackgroundBleedAvoidance bleedAvoidance)
{
if (isDocumentElement()) {
paintRootBoxFillLayers(paintInfo);
return;
}
paintFillLayers(paintInfo, backgroundColor, style()->backgroundLayers(), paintRect, bleedAvoidance);
}
bool RenderBox::backgroundHasOpaqueTopLayer() const
{
const FillLayer& fillLayer = style()->backgroundLayers();
if (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))
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 = resolveColor(CSSPropertyBackgroundColor);
if (bgColor.alpha() == 255)
return true;
}
return false;
}
void RenderBox::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(this) || paintInfo.phase != PaintPhaseMask)
return;
LayoutRect paintRect = LayoutRect(paintOffset, size());
paintMaskImages(paintInfo, paintRect);
}
void RenderBox::paintMaskImages(const PaintInfo& paintInfo, const LayoutRect& paintRect)
{
paintFillLayers(paintInfo, Color::transparent, style()->maskLayers(), paintRect, BackgroundBleedNone);
paintNinePieceImage(paintInfo.context, paintRect, style(), style()->maskBoxImage());
}
void RenderBox::paintFillLayers(const PaintInfo& paintInfo, const Color& c, const FillLayer& fillLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, RenderObject* backgroundObject)
{
Vector<const FillLayer*, 8> layers;
const FillLayer* curLayer = &fillLayer;
bool shouldDrawBackgroundInSeparateBuffer = false;
bool isBottomLayerOccluded = 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() != WebBlendModeNormal)
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) && curLayer->hasRepeatXY() && curLayer->blendMode() == WebBlendModeNormal && !boxShadowShouldBeAppliedToBackground(bleedAvoidance))
break;
curLayer = curLayer->next();
}
if (layers.size() > 0 && (**layers.rbegin()).next())
isBottomLayerOccluded = true;
GraphicsContext* context = paintInfo.context;
if (!context)
shouldDrawBackgroundInSeparateBuffer = false;
bool skipBaseColor = false;
if (shouldDrawBackgroundInSeparateBuffer) {
bool isBaseColorVisible = !isBottomLayerOccluded && c.hasAlpha();
// Paint the document's base background color outside the transparency layer,
// so that the background images don't blend with this color: http://crbug.com/389039.
if (isBaseColorVisible && isDocumentElementWithOpaqueBackground()) {
paintRootBackgroundColor(paintInfo, rect, Color());
skipBaseColor = true;
}
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, backgroundObject, skipBaseColor);
if (shouldDrawBackgroundInSeparateBuffer)
context->endLayer();
}
void RenderBox::paintFillLayer(const PaintInfo& paintInfo, const Color& c, const FillLayer& fillLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, RenderObject* backgroundObject, bool skipBaseColor)
{
paintFillLayerExtended(paintInfo, c, fillLayer, rect, bleedAvoidance, 0, LayoutSize(), backgroundObject, skipBaseColor);
}
bool RenderBox::pushContentsClip(PaintInfo& paintInfo, const LayoutPoint& accumulatedOffset, ContentsClipBehavior contentsClipBehavior)
{
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;
LayoutRect clipRect = isControlClip ? controlClipRect(accumulatedOffset) : overflowClipRect(accumulatedOffset);
RoundedRect clipRoundedRect(0, 0, 0, 0);
bool hasBorderRadius = style()->hasBorderRadius();
if (hasBorderRadius)
clipRoundedRect = style()->getRoundedInnerBorderFor(LayoutRect(accumulatedOffset, size()));
if (contentsClipBehavior == SkipContentsClipIfPossible) {
LayoutRect contentsVisualOverflow = contentsVisualOverflowRect();
if (contentsVisualOverflow.isEmpty())
return false;
LayoutRect conservativeClipRect = clipRect;
if (hasBorderRadius)
conservativeClipRect.intersect(clipRoundedRect.radiusCenterRect());
conservativeClipRect.moveBy(-accumulatedOffset);
if (hasLayer())
conservativeClipRect.move(scrolledContentOffset());
if (conservativeClipRect.contains(contentsVisualOverflow))
return false;
}
if (paintInfo.phase == PaintPhaseOutline)
paintInfo.phase = PaintPhaseChildOutlines;
else if (paintInfo.phase == PaintPhaseChildBlockBackground) {
paintInfo.phase = PaintPhaseBlockBackground;
paintObject(paintInfo, accumulatedOffset);
paintInfo.phase = PaintPhaseChildBlockBackgrounds;
}
paintInfo.context->save();
if (hasBorderRadius)
paintInfo.context->clipRoundedRect(clipRoundedRect);
paintInfo.context->clip(pixelSnappedIntRect(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)
{
LayoutRect clipRect = borderBoxRect();
clipRect.setLocation(location + clipRect.location() + LayoutSize(borderLeft(), borderTop()));
clipRect.setSize(clipRect.size() - LayoutSize(borderLeft() + borderRight(), borderTop() + borderBottom()));
return clipRect;
}
LayoutRect RenderBox::clipRect(const LayoutPoint& location)
{
LayoutRect borderBoxRect = this->borderBoxRect();
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);
}
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::containingBlockLogicalHeightForContent(AvailableLogicalHeightType heightType) const
{
return containingBlock()->availableLogicalHeight(heightType);
}
void RenderBox::mapLocalToContainer(const RenderLayerModelObject* paintInvalidationContainer, TransformState& transformState, MapCoordinatesFlags mode) const
{
if (paintInvalidationContainer == this)
return;
bool containerSkipped;
RenderObject* o = container(paintInvalidationContainer, &containerSkipped);
if (!o)
return;
LayoutSize containerOffset = offsetFromContainer(o, roundedLayoutPoint(transformState.mappedPoint()));
bool preserve3D = mode & UseTransforms && (o->style()->preserves3D() || style()->preserves3D());
if (mode & UseTransforms && shouldUseTransformFromContainer(o)) {
TransformationMatrix t;
getTransformFromContainer(o, 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 paintInvalidationContainer and o, because transforms create containers, so it should be safe
// to just subtract the delta between the paintInvalidationContainer and o.
LayoutSize containerOffset = paintInvalidationContainer->offsetFromAncestorContainer(o);
transformState.move(-containerOffset.width(), -containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
return;
}
mode &= ~ApplyContainerFlip;
o->mapLocalToContainer(paintInvalidationContainer, transformState, mode);
}
LayoutSize RenderBox::offsetFromContainer(const RenderObject* o, const LayoutPoint& point, bool* offsetDependsOnPoint) const
{
ASSERT(o == container());
LayoutSize offset;
if (isRelPositioned())
offset += offsetForInFlowPosition();
if (!isInline() || isReplaced())
offset += locationOffset();
if (o->hasOverflowClip())
offset -= toRenderBox(o)->scrolledContentOffset();
if (style()->position() == AbsolutePosition && o->isRelPositioned() && o->isRenderInline())
offset += toRenderInline(o)->offsetForInFlowPositionedInline(*this);
return offset;
}
InlineBox* RenderBox::createInlineBox()
{
return new InlineBox(*this);
}
void RenderBox::dirtyLineBoxes(bool fullLayout)
{
if (inlineBoxWrapper()) {
if (fullLayout) {
inlineBoxWrapper()->destroy();
ASSERT(m_rareData);
m_rareData->m_inlineBoxWrapper = 0;
} else {
inlineBoxWrapper()->dirtyLineBoxes();
}
}
}
void RenderBox::positionLineBox(InlineBox* 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& root = box->root();
root.block().setStaticInlinePositionForChild(this, LayoutUnit::fromFloatRound(box->logicalLeft()));
if (style()->hasStaticInlinePosition())
setChildNeedsLayout(MarkOnlyThis); // Just go ahead and 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())
setChildNeedsLayout(MarkOnlyThis); // Just go ahead and mark the positioned object as needing layout, so it will update its position properly.
}
if (container()->isRenderInline())
moveWithEdgeOfInlineContainerIfNecessary();
// Nuke the box.
box->remove(DontMarkLineBoxes);
box->destroy();
} else if (isReplaced()) {
setLocation(roundedLayoutPoint(box->topLeft()));
setInlineBoxWrapper(box);
}
}
void RenderBox::moveWithEdgeOfInlineContainerIfNecessary()
{
ASSERT(isOutOfFlowPositioned() && container()->isRenderInline() && container()->isRelPositioned());
// If this object is inside a relative positioned inline and its inline position is an explicit offset from the edge of its container
// then it will need to move if its inline container has changed width. We do not track if the width has changed
// but if we are here then we are laying out lines inside it, so it probably has - mark our object for layout so that it can
// move to the new offset created by the new width.
if (!normalChildNeedsLayout() && !style()->hasStaticInlinePosition())
setChildNeedsLayout(MarkOnlyThis);
}
void RenderBox::deleteLineBoxWrapper()
{
if (inlineBoxWrapper()) {
if (!documentBeingDestroyed())
inlineBoxWrapper()->remove();
inlineBoxWrapper()->destroy();
ASSERT(m_rareData);
m_rareData->m_inlineBoxWrapper = 0;
}
}
void RenderBox::updateLogicalWidth()
{
LogicalExtentComputedValues computedValues;
computeLogicalWidth(computedValues);
setLogicalWidth(computedValues.m_extent);
setLogicalLeft(computedValues.m_position);
setMarginStart(computedValues.m_margins.m_start);
setMarginEnd(computedValues.m_margins.m_end);
}
void RenderBox::computeLogicalWidth(LogicalExtentComputedValues& computedValues) 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);
return;
}
// If layout is limited to a subtree, the subtree root's logical width does not change.
if (node() && view()->frameView() && 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 (hasOverrideWidth() && parent()->isFlexibleBox()) {
computedValues.m_extent = overrideLogicalContentWidth() + borderAndPaddingLogicalWidth();
return;
}
bool treatAsReplaced = shouldComputeSizeAsReplaced();
RenderStyle* styleToUse = style();
Length logicalWidthLength = treatAsReplaced ? Length(computeReplacedLogicalWidth(), Fixed) : styleToUse->logicalWidth();
RenderBlock* cb = containingBlock();
LayoutUnit containerLogicalWidth = std::max<LayoutUnit>(0, containingBlockLogicalWidthForContent());
if (isInline() && !isInlineBlock()) {
// 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 preferredWidth = computeLogicalWidthUsing(MainOrPreferredSize, styleToUse->logicalWidth(), containerLogicalWidth, cb);
computedValues.m_extent = constrainLogicalWidthByMinMax(preferredWidth, containerLogicalWidth, cb);
}
// Margin calculations.
computeMarginsForDirection(InlineDirection, cb, containerLogicalWidth, computedValues.m_extent, computedValues.m_margins.m_start,
computedValues.m_margins.m_end, style()->marginStart(), style()->marginEnd());
if (containerLogicalWidth && containerLogicalWidth != (computedValues.m_extent + computedValues.m_margins.m_start + computedValues.m_margins.m_end)
&& !isInline() && !cb->isFlexibleBox()) {
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 = minimumValueForLength(style()->marginStart(), availableLogicalWidth);
LayoutUnit marginEnd = minimumValueForLength(style()->marginEnd(), availableLogicalWidth);
return availableLogicalWidth - marginStart - marginEnd;
}
LayoutUnit RenderBox::computeIntrinsicLogicalWidthUsing(const 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::computeLogicalWidthUsing(SizeType widthType, const Length& logicalWidth, LayoutUnit availableLogicalWidth, const RenderBlock* cb) 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 logicalWidthResult = fillAvailableMeasure(availableLogicalWidth);
if (widthType == MainOrPreferredSize && sizesLogicalWidthToFitContent(logicalWidth))
return std::max(minPreferredLogicalWidth(), std::min(maxPreferredLogicalWidth(), logicalWidthResult));
return logicalWidthResult;
}
static bool columnFlexItemHasStretchAlignment(const RenderObject* flexitem)
{
RenderObject* parent = flexitem->parent();
// auto margins mean we don't stretch. Note that this function will only be used for
// widths, so we don't have to check marginBefore/marginAfter.
ASSERT(parent->style()->isColumnFlexDirection());
if (flexitem->style()->marginStart().isAuto() || flexitem->style()->marginEnd().isAuto())
return false;
return flexitem->style()->alignSelf() == ItemPositionStretch || (flexitem->style()->alignSelf() == ItemPositionAuto && parent->style()->alignItems() == ItemPositionStretch);
}
bool RenderBox::sizesLogicalWidthToFitContent(const Length& logicalWidth) const
{
if (isInlineBlock())
return true;
if (logicalWidth.type() == Intrinsic)
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 go ahead and 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 (!columnFlexItemHasStretchAlignment(this))
return true;
}
return false;
}
void RenderBox::computeMarginsForDirection(MarginDirection flowDirection, const RenderBlock* containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd, Length marginStartLength, Length marginEndLength) const
{
if (flowDirection == BlockDirection || isInline()) {
// Margins are calculated with respect to the logical width of
// the containing block (8.3)
// Inline blocks/tables and floats don't have their margins increased.
marginStart = minimumValueForLength(marginStartLength, containerWidth);
marginEnd = minimumValueForLength(marginEndLength, containerWidth);
return;
}
if (containingBlock->isFlexibleBox()) {
// We need to let flexbox handle the margin adjustment - otherwise, flexbox
// will think we're wider than we actually are and calculate line sizes wrong.
// See also http://dev.w3.org/csswg/css-flexbox/#auto-margins
if (marginStartLength.isAuto())
marginStartLength.setValue(0);
if (marginEndLength.isAuto())
marginEndLength.setValue(0);
}
LayoutUnit marginStartWidth = minimumValueForLength(marginStartLength, containerWidth);
LayoutUnit marginEndWidth = minimumValueForLength(marginEndLength, containerWidth);
// CSS 2.1 (10.3.3): "If 'width' is not 'auto' and 'border-left-width' + 'padding-left' + 'width' + 'padding-right' + 'border-right-width'
// (plus any of 'margin-left' or 'margin-right' that are not 'auto') is larger than the width of the containing block, then any 'auto'
// values for 'margin-left' or 'margin-right' are, for the following rules, treated as zero.
LayoutUnit marginBoxWidth = childWidth + (!style()->width().isAuto() ? marginStartWidth + marginEndWidth : LayoutUnit());
// CSS 2.1: "If both 'margin-left' and 'margin-right' are 'auto', their used values are equal. This horizontally centers the element
// with respect to the edges of the containing block."
if (marginStartLength.isAuto() && marginEndLength.isAuto() && marginBoxWidth < containerWidth) {
// Other browsers center the margin box for align=center elements so we match them here.
LayoutUnit centeredMarginBoxStart = std::max<LayoutUnit>(0, (containerWidth - childWidth - marginStartWidth - marginEndWidth) / 2);
marginStart = centeredMarginBoxStart + marginStartWidth;
marginEnd = containerWidth - childWidth - marginStart + marginEndWidth;
return;
}
// CSS 2.1: "If there is exactly one value specified as 'auto', its used value follows from the equality."
if (marginEndLength.isAuto() && marginBoxWidth < containerWidth) {
marginStart = marginStartWidth;
marginEnd = containerWidth - childWidth - marginStart;
return;
}
if (marginStartLength.isAuto() && marginBoxWidth < containerWidth) {
marginEnd = marginEndWidth;
marginStart = containerWidth - childWidth - marginEnd;
return;
}
// Either no auto margins, or our margin box width is >= the container width, auto margins will just turn into 0.
marginStart = marginStartWidth;
marginEnd = marginEndWidth;
}
void RenderBox::updateLogicalHeight()
{
m_intrinsicContentLogicalHeight = contentLogicalHeight();
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 (isInline() && !isReplaced())
return;
Length h;
if (isOutOfFlowPositioned())
computePositionedLogicalHeight(computedValues);
else {
RenderBlock* cb = containingBlock();
// If we are perpendicular to our containing block then we need to resolve our block-start and block-end margins so that if they
// are 'auto' we are centred or aligned within the inline flow containing block: this is done by computing the margins as though they are inline.
// Note that as this is the 'sizing phase' we are using our own writing mode rather than the containing block's. We use the containing block's
// writing mode when figuring out the block-direction margins for positioning in |computeAndSetBlockDirectionMargins| (i.e. margin collapsing etc.).
// See http://www.w3.org/TR/2014/CR-css-writing-modes-3-20140320/#orthogonal-flows
// FIXME(sky): Remove MarginDirection enum.
MarginDirection flowDirection = BlockDirection;
bool treatAsReplaced = shouldComputeSizeAsReplaced();
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 (hasOverrideHeight() && parent()->isFlexibleBox())
h = Length(overrideLogicalContentHeight(), Fixed);
else if (treatAsReplaced)
h = Length(computeReplacedLogicalHeight(), Fixed);
else {
h = style()->logicalHeight();
checkMinMaxHeight = true;
}
LayoutUnit heightResult;
if (checkMinMaxHeight) {
heightResult = computeLogicalHeightUsing(style()->logicalHeight(), computedValues.m_extent - borderAndPaddingLogicalHeight());
if (heightResult == -1)
heightResult = computedValues.m_extent;
heightResult = constrainLogicalHeightByMinMax(heightResult, computedValues.m_extent - borderAndPaddingLogicalHeight());
} 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.
ASSERT(h.isFixed());
heightResult = h.value() + borderAndPaddingLogicalHeight();
}
computedValues.m_extent = heightResult;
computeMarginsForDirection(flowDirection, cb, containingBlockLogicalWidthForContent(), computedValues.m_extent, computedValues.m_margins.m_before,
computedValues.m_margins.m_after, style()->marginBefore(), style()->marginAfter());
}
}
LayoutUnit RenderBox::computeLogicalHeightUsing(const Length& height, LayoutUnit intrinsicContentHeight) const
{
LayoutUnit logicalHeight = computeContentLogicalHeightUsing(height, intrinsicContentHeight);
if (logicalHeight != -1)
logicalHeight = adjustBorderBoxLogicalHeightForBoxSizing(logicalHeight);
return logicalHeight;
}
LayoutUnit RenderBox::computeContentLogicalHeight(const Length& height, LayoutUnit intrinsicContentHeight) const
{
LayoutUnit heightIncludingScrollbar = computeContentLogicalHeightUsing(height, intrinsicContentHeight);
if (heightIncludingScrollbar == -1)
return -1;
return std::max<LayoutUnit>(0, adjustContentBoxLogicalHeightForBoxSizing(heightIncludingScrollbar));
}
LayoutUnit RenderBox::computeIntrinsicLogicalContentHeightUsing(const Length& logicalHeightLength, LayoutUnit intrinsicContentHeight, LayoutUnit borderAndPadding) const
{
// FIXME(cbiesinger): The css-sizing spec is considering changing what min-content/max-content should resolve to.
// If that happens, this code will have to change.
if (logicalHeightLength.isMinContent() || logicalHeightLength.isMaxContent() || logicalHeightLength.isFitContent()) {
if (isReplaced())
return intrinsicSize().height();
if (m_intrinsicContentLogicalHeight != -1)
return m_intrinsicContentLogicalHeight;
return intrinsicContentHeight;
}
if (logicalHeightLength.isFillAvailable())
return containingBlock()->availableLogicalHeight(ExcludeMarginBorderPadding) - borderAndPadding;
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit RenderBox::computeContentLogicalHeightUsing(const Length& height, LayoutUnit intrinsicContentHeight) const
{
// FIXME(cbiesinger): The css-sizing spec is considering changing what min-content/max-content should resolve to.
// If that happens, this code will have to change.
if (height.isIntrinsic()) {
if (intrinsicContentHeight == -1)
return -1; // Intrinsic height isn't available.
return computeIntrinsicLogicalContentHeightUsing(height, intrinsicContentHeight, borderAndPaddingLogicalHeight());
}
if (height.isFixed())
return height.value();
if (height.isPercent())
return computePercentageLogicalHeight(height);
return -1;
}
bool RenderBox::skipContainingBlockForPercentHeightCalculation(const RenderBox* containingBlock) const
{
if (!containingBlock->isAnonymousBlock())
return false;
return !containingBlock->isOutOfFlowPositioned() && containingBlock->style()->logicalHeight().isAuto();
}
LayoutUnit RenderBox::computePercentageLogicalHeight(const Length& height) const
{
LayoutUnit availableHeight = -1;
bool skippedAutoHeightContainingBlock = false;
RenderBlock* cb = containingBlock();
const RenderBox* containingBlockChild = this;
LayoutUnit rootMarginBorderPaddingHeight = 0;
while (!cb->isRenderView() && skipContainingBlockForPercentHeightCalculation(cb)) {
if (cb->isDocumentElement())
rootMarginBorderPaddingHeight += cb->marginBefore() + cb->marginAfter() + cb->borderAndPaddingLogicalHeight();
skippedAutoHeightContainingBlock = true;
containingBlockChild = cb;
cb = cb->containingBlock();
}
cb->addPercentHeightDescendant(const_cast<RenderBox*>(this));
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()));
if (cbstyle->logicalHeight().isFixed()) {
LayoutUnit contentBoxHeight = cb->adjustContentBoxLogicalHeightForBoxSizing(cbstyle->logicalHeight().value());
availableHeight = std::max<LayoutUnit>(0, cb->constrainContentBoxLogicalHeightByMinMax(contentBoxHeight, -1));
} else if (cbstyle->logicalHeight().isPercent() && !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, -1);
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();
} else if (cb->isRenderView())
availableHeight = view()->viewLogicalHeightForPercentages();
if (availableHeight == -1)
return availableHeight;
availableHeight -= rootMarginBorderPaddingHeight;
LayoutUnit result = valueForLength(height, availableHeight);
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().isPercent()) || style()->logicalMinWidth().isMaxSizeNone() ? logicalWidth : computeReplacedLogicalWidthUsing(style()->logicalMinWidth());
LayoutUnit maxLogicalWidth = (shouldComputePreferred == ComputePreferred && style()->logicalMaxWidth().isPercent()) || style()->logicalMaxWidth().isMaxSizeNone() ? logicalWidth : computeReplacedLogicalWidthUsing(style()->logicalMaxWidth());
return std::max(minLogicalWidth, std::min(logicalWidth, maxLogicalWidth));
}
LayoutUnit RenderBox::computeReplacedLogicalWidthUsing(const 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(toRenderBoxModelObject(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.isPercent())))
return adjustContentBoxLogicalWidthForBoxSizing(minimumValueForLength(logicalWidth, cw));
return 0;
}
case Intrinsic:
case MinIntrinsic:
case Auto:
case MaxSizeNone:
return intrinsicLogicalWidth();
case DeviceWidth:
case DeviceHeight:
break;
}
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit RenderBox::computeReplacedLogicalHeight() const
{
return computeReplacedLogicalHeightRespectingMinMaxHeight(computeReplacedLogicalHeightUsing(style()->logicalHeight()));
}
bool RenderBox::logicalHeightComputesAsNone(SizeType sizeType) const
{
ASSERT(sizeType == MinSize || sizeType == MaxSize);
Length logicalHeight = sizeType == MinSize ? style()->logicalMinHeight() : style()->logicalMaxHeight();
Length initialLogicalHeight = sizeType == MinSize ? RenderStyle::initialMinSize() : RenderStyle::initialMaxSize();
if (logicalHeight == initialLogicalHeight)
return true;
if (!logicalHeight.isPercent() || isOutOfFlowPositioned())
return false;
// Anonymous block boxes are ignored when resolving percentage values that would refer to it:
// the closest non-anonymous ancestor box is used instead.
RenderBlock* containingBlock = this->containingBlock();
while (containingBlock->isAnonymous())
containingBlock = containingBlock->containingBlock();
return containingBlock->hasAutoHeightOrContainingBlockWithAutoHeight();
}
LayoutUnit RenderBox::computeReplacedLogicalHeightRespectingMinMaxHeight(LayoutUnit logicalHeight) const
{
// If the height of the containing block is not specified explicitly (i.e., it depends on content height), and this element is not absolutely positioned,
// the percentage value is treated as '0' (for 'min-height') or 'none' (for 'max-height').
LayoutUnit minLogicalHeight;
if (!logicalHeightComputesAsNone(MinSize))
minLogicalHeight = computeReplacedLogicalHeightUsing(style()->logicalMinHeight());
LayoutUnit maxLogicalHeight = logicalHeight;
if (!logicalHeightComputesAsNone(MaxSize))
maxLogicalHeight = computeReplacedLogicalHeightUsing(style()->logicalMaxHeight());
return std::max(minLogicalHeight, std::min(logicalHeight, maxLogicalHeight));
}
LayoutUnit RenderBox::computeReplacedLogicalHeightUsing(const Length& logicalHeight) const
{
switch (logicalHeight.type()) {
case Fixed:
return adjustContentBoxLogicalHeightForBoxSizing(logicalHeight.value());
case Percent:
case Calculated:
{
RenderObject* cb = isOutOfFlowPositioned() ? container() : containingBlock();
while (cb->isAnonymous())
cb = cb->containingBlock();
if (cb->isRenderBlock())
toRenderBlock(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 = toRenderBlock(cb);
LogicalExtentComputedValues computedValues;
block->computeLogicalHeight(block->logicalHeight(), 0, computedValues);
LayoutUnit newContentHeight = computedValues.m_extent - block->borderAndPaddingLogicalHeight();
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(toRenderBoxModelObject(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().isPercent())) {
toRenderBlock(cb)->addPercentHeightDescendant(const_cast<RenderBox*>(this));
cb = cb->containingBlock();
}
}
return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(logicalHeight, availableHeight));
}
case MinContent:
case MaxContent:
case FitContent:
case FillAvailable:
return adjustContentBoxLogicalHeightForBoxSizing(computeIntrinsicLogicalContentHeightUsing(logicalHeight, intrinsicLogicalHeight(), borderAndPaddingHeight()));
default:
return intrinsicLogicalHeight();
}
}
LayoutUnit RenderBox::availableLogicalHeight(AvailableLogicalHeightType heightType) const
{
// http://www.w3.org/TR/CSS2/visudet.html#propdef-height - We are interested in the content height.
return constrainContentBoxLogicalHeightByMinMax(availableLogicalHeightUsing(style()->logicalHeight(), heightType), -1);
}
LayoutUnit RenderBox::availableLogicalHeightUsing(const Length& h, AvailableLogicalHeightType heightType) const
{
if (isRenderView())
return toRenderView(this)->frameView()->unscaledVisibleContentSize().height();
if (h.isPercent() && isOutOfFlowPositioned()) {
// FIXME: This is wrong if the containingBlock has a perpendicular writing mode.
LayoutUnit availableHeight = containingBlockLogicalHeightForPositioned(containingBlock());
return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(h, availableHeight));
}
LayoutUnit heightIncludingScrollbar = computeContentLogicalHeightUsing(h, -1);
if (heightIncludingScrollbar != -1)
return std::max<LayoutUnit>(0, adjustContentBoxLogicalHeightForBoxSizing(heightIncludingScrollbar));
// FIXME: Check logicalTop/logicalBottom here to correctly handle vertical writing-mode.
// https://bugs.webkit.org/show_bug.cgi?id=46500
if (isRenderBlock() && isOutOfFlowPositioned() && style()->height().isAuto() && !(style()->top().isAuto() || style()->bottom().isAuto())) {
RenderBlock* block = const_cast<RenderBlock*>(toRenderBlock(this));
LogicalExtentComputedValues computedValues;
block->computeLogicalHeight(block->logicalHeight(), 0, computedValues);
LayoutUnit newContentHeight = computedValues.m_extent - block->borderAndPaddingLogicalHeight();
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::computeAndSetBlockDirectionMargins(const RenderBlock* containingBlock)
{
LayoutUnit marginBefore;
LayoutUnit marginAfter;
computeMarginsForDirection(BlockDirection, containingBlock, containingBlockLogicalWidthForContent(), logicalHeight(), marginBefore, marginAfter,
style()->marginBeforeUsing(containingBlock->style()),
style()->marginAfterUsing(containingBlock->style()));
// Note that in this 'positioning phase' of the layout we are using the containing block's writing mode rather than our own when calculating margins.
// See http://www.w3.org/TR/2014/CR-css-writing-modes-3-20140320/#orthogonal-flows
containingBlock->setMarginBeforeForChild(this, marginBefore);
containingBlock->setMarginAfterForChild(this, marginAfter);
}
LayoutUnit RenderBox::containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock) const
{
if (containingBlock->isBox())
return toRenderBox(containingBlock)->clientLogicalWidth();
ASSERT(containingBlock->isRenderInline() && containingBlock->isRelPositioned());
const RenderInline* flow = toRenderInline(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) const
{
if (containingBlock->isBox()) {
const RenderBlock* cb = containingBlock->isRenderBlock() ?
toRenderBlock(containingBlock) : containingBlock->containingBlock();
return cb->clientLogicalHeight();
}
ASSERT(containingBlock->isRenderInline() && containingBlock->isRelPositioned());
const RenderInline* flow = toRenderInline(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;
LayoutRect boundingBox = flow->linesBoundingBox();
LayoutUnit heightResult = boundingBox.height();
heightResult -= (containingBlock->borderBefore() + containingBlock->borderAfter());
return heightResult;
}
static void computeInlineStaticDistance(Length& logicalLeft, Length& logicalRight, const RenderBox* child, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalWidth)
{
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 (RenderObject* curr = child->parent(); curr && curr != containerBlock; curr = curr->container()) {
if (curr->isBox()) {
staticPosition += toRenderBox(curr)->logicalLeft();
if (toRenderBox(curr)->isRelPositioned())
staticPosition += toRenderBox(curr)->relativePositionOffset().width();
} else if (curr->isInline()) {
if (curr->isRelPositioned()) {
if (!curr->style()->logicalLeft().isAuto())
staticPosition += curr->style()->logicalLeft().value();
else
staticPosition -= curr->style()->logicalRight().value();
}
}
}
logicalLeft.setValue(Fixed, staticPosition);
} else {
RenderBox* enclosingBox = child->parent()->enclosingBox();
LayoutUnit staticPosition = child->layer()->staticInlinePosition() + containerLogicalWidth + containerBlock->borderLogicalLeft();
for (RenderObject* curr = child->parent(); curr; curr = curr->container()) {
if (curr->isBox()) {
if (curr != containerBlock) {
staticPosition -= toRenderBox(curr)->logicalLeft();
if (toRenderBox(curr)->isRelPositioned())
staticPosition -= toRenderBox(curr)->relativePositionOffset().width();
}
if (curr == enclosingBox)
staticPosition -= enclosingBox->logicalWidth();
} else if (curr->isInline()) {
if (curr->isRelPositioned()) {
if (!curr->style()->logicalLeft().isAuto())
staticPosition -= curr->style()->logicalLeft().value();
else
staticPosition += curr->style()->logicalRight().value();
}
}
if (curr == containerBlock)
break;
}
logicalRight.setValue(Fixed, staticPosition);
}
}
void RenderBox::computePositionedLogicalWidth(LogicalExtentComputedValues& computedValues) const
{
if (isReplaced()) {
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 = toRenderBoxModelObject(container());
const LayoutUnit containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
// 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();
const LayoutUnit bordersPlusPadding = borderAndPaddingLogicalWidth();
const Length marginLogicalLeft = style()->marginLeft();
const Length marginLogicalRight = style()->marginRight();
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);
// 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().isMaxSizeNone()) {
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;
}
static void computeLogicalLeftPositionedOffset(LayoutUnit& logicalLeftPos, const RenderBox* child, LayoutUnit logicalWidthValue, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalWidth)
{
// FIXME(sky): Remove
logicalLeftPos += containerBlock->borderLeft();
}
void RenderBox::shrinkToFitWidth(const LayoutUnit availableSpace, const LayoutUnit logicalLeftValue, const LayoutUnit bordersPlusPadding, LogicalExtentComputedValues& computedValues) const
{
// 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);
}
void RenderBox::computePositionedLogicalWidthUsing(Length logicalWidth, const RenderBoxModelObject* containerBlock, TextDirection containerDirection,
LayoutUnit containerLogicalWidth, LayoutUnit bordersPlusPadding,
const Length& logicalLeft, const Length& logicalRight, const Length& marginLogicalLeft,
const 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);
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);
shrinkToFitWidth(availableSpace, logicalLeftValue, bordersPlusPadding, computedValues);
} 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 (containerBlock->isRenderInline() && !containerBlock->style()->isLeftToRightDirection()) {
const RenderInline* flow = toRenderInline(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 (RenderObject* curr = child->parent(); curr && curr != containerBlock; curr = curr->container()) {
if (curr->isBox())
staticLogicalTop += toRenderBox(curr)->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 = toRenderBoxModelObject(container());
const LayoutUnit containerLogicalHeight = containingBlockLogicalHeightForPositioned(containerBlock);
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().isMaxSizeNone()) {
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() || styleToUse->logicalMinHeight().isIntrinsic()) {
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;
}
static void computeLogicalTopPositionedOffset(LayoutUnit& logicalTopPos, const RenderBox* child, LayoutUnit logicalHeightValue, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalHeight)
{
// FIXME(sky): Remove
logicalTopPos += containerBlock->borderTop();
}
void RenderBox::computePositionedLogicalHeightUsing(Length logicalHeightLength, const RenderBoxModelObject* containerBlock,
LayoutUnit containerLogicalHeight, LayoutUnit bordersPlusPadding, LayoutUnit logicalHeight,
const Length& logicalTop, const Length& logicalBottom, const Length& marginBefore,
const 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);
LayoutUnit logicalTopValue = 0;
bool logicalHeightIsAuto = logicalHeightLength.isAuto();
bool logicalTopIsAuto = logicalTop.isAuto();
bool logicalBottomIsAuto = logicalBottom.isAuto();
LayoutUnit resolvedLogicalHeight;
if (logicalHeightLength.isIntrinsic())
resolvedLogicalHeight = computeIntrinsicLogicalContentHeightUsing(logicalHeightLength, contentLogicalHeight, bordersPlusPadding);
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 = toRenderBoxModelObject(container());
const LayoutUnit containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
// 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.
Length logicalLeft = style()->logicalLeft();
Length logicalRight = style()->logicalRight();
Length marginLogicalLeft = style()->marginLeft();
Length marginLogicalRight = style()->marginRight();
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);
/*-----------------------------------------------------------------------*\
* 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 (containerBlock->isRenderInline() && !containerBlock->style()->isLeftToRightDirection()) {
const RenderInline* flow = toRenderInline(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 = toRenderBoxModelObject(container());
const LayoutUnit containerLogicalHeight = containingBlockLogicalHeightForPositioned(containerBlock);
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
// 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) {
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())
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 (node() && !(editingIgnoresContent(node()) || isRenderedTableElement(node()))) {
rect.setX(rect.x() + borderLeft() + paddingLeft());
rect.setY(rect.y() + paddingTop() + borderTop());
}
return rect;
}
PositionWithAffinity RenderBox::positionForPoint(const LayoutPoint& point)
{
// no children...return this render object's element, if there is one, and offset 0
RenderObject* firstChild = slowFirstChild();
if (!firstChild)
return createPositionWithAffinity(node() ? firstPositionInOrBeforeNode(node()) : Position());
// Pass off to the closest child.
LayoutUnit minDist = LayoutUnit::max();
RenderBox* closestRenderer = 0;
LayoutPoint adjustedPoint = point;
for (RenderObject* renderObject = firstChild; renderObject; renderObject = renderObject->nextSibling()) {
if (!renderObject->slowFirstChild() && !renderObject->isInline() && !renderObject->isRenderBlockFlow())
continue;
if (!renderObject->isBox())
continue;
RenderBox* renderer = toRenderBox(renderObject);
LayoutUnit top = renderer->borderTop() + renderer->paddingTop() + renderer->y();
LayoutUnit bottom = top + renderer->contentHeight();
LayoutUnit left = renderer->borderLeft() + renderer->paddingLeft() + renderer->x();
LayoutUnit right = left + renderer->contentWidth();
if (point.x() <= right && point.x() >= left && point.y() <= top && point.y() >= bottom)
return renderer->positionForPoint(point - renderer->locationOffset());
// 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());
return createPositionWithAffinity(firstPositionInOrBeforeNode(node()));
}
void RenderBox::addVisualEffectOverflow()
{
if (!style()->hasVisualOverflowingEffect())
return;
// Add in the final overflow with shadows, outsets and outline combined.
LayoutRect visualEffectOverflow = borderBoxRect();
visualEffectOverflow.expand(computeVisualEffectOverflowExtent());
addVisualOverflow(visualEffectOverflow);
}
LayoutBoxExtent RenderBox::computeVisualEffectOverflowExtent() const
{
ASSERT(style()->hasVisualOverflowingEffect());
LayoutUnit top;
LayoutUnit right;
LayoutUnit bottom;
LayoutUnit left;
if (style()->boxShadow()) {
style()->getBoxShadowExtent(top, right, bottom, left);
// Box shadow extent's top and left are negative when extend to left and top direction, respectively.
// Negate to make them positive.
top = -top;
left = -left;
}
if (style()->hasBorderImageOutsets()) {
LayoutBoxExtent borderOutsets = style()->borderImageOutsets();
top = std::max(top, borderOutsets.top());
right = std::max(right, borderOutsets.right());
bottom = std::max(bottom, borderOutsets.bottom());
left = std::max(left, borderOutsets.left());
}
if (style()->hasOutline()) {
if (style()->outlineStyleIsAuto()) {
// The result focus ring rects are in coordinates of this object's border box.
Vector<IntRect> focusRingRects;
addFocusRingRects(focusRingRects, LayoutPoint(), this);
IntRect rect = unionRect(focusRingRects);
int outlineSize = GraphicsContext::focusRingOutsetExtent(style()->outlineOffset(), style()->outlineWidth());
top = std::max<LayoutUnit>(top, -rect.y() + outlineSize);
right = std::max<LayoutUnit>(right, rect.maxX() - width() + outlineSize);
bottom = std::max<LayoutUnit>(bottom, rect.maxY() - height() + outlineSize);
left = std::max<LayoutUnit>(left, -rect.x() + outlineSize);
} else {
LayoutUnit outlineSize = style()->outlineSize();
top = std::max(top, outlineSize);
right = std::max(right, outlineSize);
bottom = std::max(bottom, outlineSize);
left = std::max(left, outlineSize);
}
}
return LayoutBoxExtent(top, right, bottom, left);
}
void RenderBox::addOverflowFromChild(RenderBox* child, const LayoutSize& 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();
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())
return;
LayoutRect childVisualOverflowRect = child->visualOverflowRect();
childVisualOverflowRect.move(delta);
addContentsVisualOverflow(childVisualOverflowRect);
}
void RenderBox::addLayoutOverflow(const LayoutRect& rect)
{
LayoutRect clientBox = paddingBoxRect();
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 = false;
bool hasLeftOverflow = !style()->isLeftToRightDirection();
if (isFlexibleBox() && style()->isReverseFlexDirection()) {
RenderFlexibleBox* flexibleBox = toRenderFlexibleBox(this);
if (flexibleBox->isHorizontalFlow())
hasLeftOverflow = true;
else
hasTopOverflow = true;
}
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 = adoptPtr(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 = adoptPtr(new RenderOverflow(paddingBoxRect(), borderBox));
m_overflow->addVisualOverflow(rect);
}
void RenderBox::addContentsVisualOverflow(const LayoutRect& rect)
{
if (!hasOverflowClip()) {
addVisualOverflow(rect);
return;
}
if (!m_overflow)
m_overflow = adoptPtr(new RenderOverflow(paddingBoxRect(), borderBoxRect()));
m_overflow->addContentsVisualOverflow(rect);
}
void RenderBox::clearLayoutOverflow()
{
if (!m_overflow)
return;
if (!hasVisualOverflow() && contentsVisualOverflowRect().isEmpty()) {
clearAllOverflows();
return;
}
m_overflow->setLayoutOverflow(paddingBoxRect());
}
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;
while (!cb->isRenderView() && !cb->isOutOfFlowPositioned() && cb->style()->logicalHeight().isAuto()) {
if (!cb->isAnonymousBlock())
break;
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()));
// 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().isPercent() && !isOutOfFlowPositionedWithSpecifiedHeight)
return percentageLogicalHeightIsResolvableFromBlock(cb->containingBlock(), cb->isOutOfFlowPositioned());
if (cb->isRenderView() || isOutOfFlowPositionedWithSpecifiedHeight)
return true;
if (cb->isDocumentElement() && 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;
}
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
{
ASSERT(linePositionMode == PositionOnContainingLine);
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
{
const RenderObject* curr = this;
while (curr) {
RenderLayer* layer = curr->hasLayer() && curr->isBox() ? toRenderBox(curr)->layer() : 0;
if (layer && layer->isSelfPaintingLayer())
return layer;
curr = curr->parent();
}
return 0;
}
LayoutRect RenderBox::layoutOverflowRectForPropagation() const
{
// Only propagate interior layout overflow if we don't clip it.
LayoutRect rect = borderBoxRect();
rect.expand(LayoutSize(LayoutUnit(), marginAfter()));
if (!hasOverflowClip())
rect.unite(layoutOverflowRect());
bool hasTransform = hasLayer() && layer()->transform();
if (isRelPositioned() || hasTransform) {
if (hasTransform)
rect = layer()->currentTransform().mapRect(rect);
if (isRelPositioned())
rect.move(offsetForInFlowPosition());
}
return rect;
}
LayoutUnit RenderBox::offsetLeft() const
{
return adjustedPositionRelativeToOffsetParent(location()).x();
}
LayoutUnit RenderBox::offsetTop() const
{
return adjustedPositionRelativeToOffsetParent(location()).y();
}
bool RenderBox::hasRelativeLogicalHeight() const
{
return style()->logicalHeight().isPercent()
|| style()->logicalMinHeight().isPercent()
|| style()->logicalMaxHeight().isPercent();
}
RenderBox::BoxDecorationData::BoxDecorationData(const RenderStyle& style)
{
backgroundColor = style.colorIncludingFallback(CSSPropertyBackgroundColor);
hasBackground = backgroundColor.alpha() || style.hasBackgroundImage();
ASSERT(hasBackground == style.hasBackground());
hasBorder = style.hasBorder();
}
} // namespace blink