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chromium / chromium / blink / 92189a9881a5ccdec4197fe086000a3af3939ec5 / . / Source / core / rendering / RenderBox.cpp
blob: 54b0ed5055231912127f0f3efa70a0cf2a284380 [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 "config.h"
#include "core/rendering/RenderBox.h"
#include <math.h>
#include <algorithm>
#include "HTMLNames.h"
#include "core/dom/Document.h"
#include "core/editing/htmlediting.h"
#include "core/html/HTMLElement.h"
#include "core/html/HTMLFrameElementBase.h"
#include "core/html/HTMLFrameOwnerElement.h"
#include "core/html/HTMLHtmlElement.h"
#include "core/html/HTMLTextAreaElement.h"
#include "core/frame/Frame.h"
#include "core/frame/FrameView.h"
#include "core/page/AutoscrollController.h"
#include "core/page/EventHandler.h"
#include "core/page/Page.h"
#include "core/platform/graphics/GraphicsContextStateSaver.h"
#include "core/rendering/HitTestResult.h"
#include "core/rendering/LayoutRectRecorder.h"
#include "core/rendering/PaintInfo.h"
#include "core/rendering/RenderBoxRegionInfo.h"
#include "core/rendering/RenderFlexibleBox.h"
#include "core/rendering/RenderFlowThread.h"
#include "core/rendering/RenderGeometryMap.h"
#include "core/rendering/RenderGrid.h"
#include "core/rendering/RenderInline.h"
#include "core/rendering/RenderLayer.h"
#include "core/rendering/RenderLayerCompositor.h"
#include "core/rendering/RenderListMarker.h"
#include "core/rendering/RenderRegion.h"
#include "core/rendering/RenderTableCell.h"
#include "core/rendering/RenderTheme.h"
#include "core/rendering/RenderView.h"
#include "platform/geometry/FloatQuad.h"
#include "platform/geometry/TransformState.h"
using namespace std;
namespace WebCore {
using namespace HTMLNames;
// Used by flexible boxes when flexing this element and by table cells.
typedef WTF::HashMap<const RenderBox*, LayoutUnit> OverrideSizeMap;
static OverrideSizeMap* gOverrideHeightMap = 0;
static OverrideSizeMap* gOverrideWidthMap = 0;
// Used by grid elements to properly size their grid items.
static OverrideSizeMap* gOverrideContainingBlockLogicalHeightMap = 0;
static OverrideSizeMap* gOverrideContainingBlockLogicalWidthMap = 0;
// Size of border belt for autoscroll. When mouse pointer in border belt,
// autoscroll is started.
static const int autoscrollBeltSize = 20;
static const unsigned backgroundObscurationTestMaxDepth = 4;
bool RenderBox::s_hadOverflowClip = false;
static bool skipBodyBackground(const RenderBox* bodyElementRenderer)
{
ASSERT(bodyElementRenderer->isBody());
// The <body> only paints its background if the root element has defined a background independent of the body,
// or if the <body>'s parent is not the document element's renderer (e.g. inside SVG foreignObject).
RenderObject* documentElementRenderer = bodyElementRenderer->document().documentElement()->renderer();
return documentElementRenderer
&& !documentElementRenderer->hasBackground()
&& (documentElementRenderer == bodyElementRenderer->parent());
}
RenderBox::RenderBox(ContainerNode* node)
: RenderBoxModelObject(node)
, m_minPreferredLogicalWidth(-1)
, m_maxPreferredLogicalWidth(-1)
, m_intrinsicContentLogicalHeight(-1)
, m_inlineBoxWrapper(0)
{
setIsBox();
}
RenderBox::~RenderBox()
{
}
LayoutRect RenderBox::borderBoxRectInRegion(RenderRegion* region, RenderBoxRegionInfoFlags cacheFlag) const
{
if (!region)
return borderBoxRect();
// Compute the logical width and placement in this region.
RenderBoxRegionInfo* boxInfo = renderBoxRegionInfo(region, cacheFlag);
if (!boxInfo)
return borderBoxRect();
// We have cached insets.
LayoutUnit logicalWidth = boxInfo->logicalWidth();
LayoutUnit logicalLeft = boxInfo->logicalLeft();
// Now apply the parent inset since it is cumulative whenever anything in the containing block chain shifts.
// FIXME: Doesn't work right with perpendicular writing modes.
const RenderBlock* currentBox = containingBlock();
RenderBoxRegionInfo* currentBoxInfo = currentBox->renderBoxRegionInfo(region);
while (currentBoxInfo && currentBoxInfo->isShifted()) {
if (currentBox->style()->direction() == LTR)
logicalLeft += currentBoxInfo->logicalLeft();
else
logicalLeft -= (currentBox->logicalWidth() - currentBoxInfo->logicalWidth()) - currentBoxInfo->logicalLeft();
currentBox = currentBox->containingBlock();
region = currentBox->clampToStartAndEndRegions(region);
currentBoxInfo = currentBox->renderBoxRegionInfo(region);
}
if (cacheFlag == DoNotCacheRenderBoxRegionInfo)
delete boxInfo;
if (isHorizontalWritingMode())
return LayoutRect(logicalLeft, 0, logicalWidth, height());
return LayoutRect(0, logicalLeft, width(), logicalWidth);
}
void RenderBox::clearRenderBoxRegionInfo()
{
if (isRenderFlowThread())
return;
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread)
flowThread->removeRenderBoxRegionInfo(this);
}
void RenderBox::willBeDestroyed()
{
clearOverrideSize();
clearContainingBlockOverrideSize();
RenderBlock::removePercentHeightDescendantIfNeeded(this);
ShapeOutsideInfo::removeInfo(this);
RenderBoxModelObject::willBeDestroyed();
}
void RenderBox::removeFloatingOrPositionedChildFromBlockLists()
{
ASSERT(isFloatingOrOutOfFlowPositioned());
if (documentBeingDestroyed())
return;
if (isFloating()) {
RenderBlockFlow* parentBlockFlow = 0;
for (RenderObject* curr = parent(); curr && !curr->isRenderView(); curr = curr->parent()) {
if (curr->isRenderBlockFlow()) {
RenderBlockFlow* currBlockFlow = toRenderBlockFlow(curr);
if (!parentBlockFlow || currBlockFlow->containsFloat(this))
parentBlockFlow = currBlockFlow;
}
}
if (parentBlockFlow) {
parentBlockFlow->markSiblingsWithFloatsForLayout(this);
parentBlockFlow->markAllDescendantsWithFloatsForLayout(this, false);
}
}
if (isOutOfFlowPositioned())
RenderBlock::removePositionedObject(this);
}
void RenderBox::styleWillChange(StyleDifference diff, const RenderStyle* newStyle)
{
s_hadOverflowClip = hasOverflowClip();
RenderStyle* oldStyle = style();
if (oldStyle) {
// The background of the root element or the body element could propagate up to
// the canvas. Just dirty the entire canvas when our style changes substantially.
if (diff >= StyleDifferenceRepaint && node() &&
(isHTMLHtmlElement(node()) || node()->hasTagName(bodyTag))) {
view()->repaint();
if (oldStyle->hasEntirelyFixedBackground() != newStyle->hasEntirelyFixedBackground())
view()->compositor()->rootFixedBackgroundsChanged();
}
// When a layout hint happens and an object's position style changes, we have to do a layout
// to dirty the render tree using the old position value now.
if (diff == StyleDifferenceLayout && parent() && oldStyle->position() != newStyle->position()) {
markContainingBlocksForLayout();
if (oldStyle->position() == StaticPosition)
repaint();
else if (newStyle->hasOutOfFlowPosition())
parent()->setChildNeedsLayout();
if (isFloating() && !isOutOfFlowPositioned() && newStyle->hasOutOfFlowPosition())
removeFloatingOrPositionedChildFromBlockLists();
}
} else if (newStyle && isBody())
view()->repaint();
RenderBoxModelObject::styleWillChange(diff, newStyle);
}
void RenderBox::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
// Horizontal writing mode definition is updated in RenderBoxModelObject::updateFromStyle,
// (as part of the RenderBoxModelObject::styleDidChange call below). So, we can safely cache the horizontal
// writing mode value before style change here.
bool oldHorizontalWritingMode = isHorizontalWritingMode();
RenderBoxModelObject::styleDidChange(diff, oldStyle);
RenderStyle* newStyle = style();
if (needsLayout() && oldStyle) {
RenderBlock::removePercentHeightDescendantIfNeeded(this);
// Normally we can do optimized positioning layout for absolute/fixed positioned objects. There is one special case, however, which is
// when the positioned object's margin-before is changed. In this case the parent has to get a layout in order to run margin collapsing
// to determine the new static position.
if (isOutOfFlowPositioned() && newStyle->hasStaticBlockPosition(isHorizontalWritingMode()) && oldStyle->marginBefore() != newStyle->marginBefore()
&& parent() && !parent()->normalChildNeedsLayout())
parent()->setChildNeedsLayout();
}
if (RenderBlock::hasPercentHeightContainerMap() && firstChild()
&& oldHorizontalWritingMode != isHorizontalWritingMode())
RenderBlock::clearPercentHeightDescendantsFrom(this);
// If our zoom factor changes and we have a defined scrollLeft/Top, we need to adjust that value into the
// new zoomed coordinate space.
if (hasOverflowClip() && oldStyle && newStyle && oldStyle->effectiveZoom() != newStyle->effectiveZoom() && layer()) {
if (int left = layer()->scrollableArea()->scrollXOffset()) {
left = (left / oldStyle->effectiveZoom()) * newStyle->effectiveZoom();
layer()->scrollableArea()->scrollToXOffset(left);
}
if (int top = layer()->scrollableArea()->scrollYOffset()) {
top = (top / oldStyle->effectiveZoom()) * newStyle->effectiveZoom();
layer()->scrollableArea()->scrollToYOffset(top);
}
}
// Our opaqueness might have changed without triggering layout.
if (diff == StyleDifferenceRepaint || diff == StyleDifferenceRepaintIfTextOrColorChange || diff == StyleDifferenceRepaintLayer) {
RenderObject* parentToInvalidate = parent();
for (unsigned i = 0; i < backgroundObscurationTestMaxDepth && parentToInvalidate; ++i) {
parentToInvalidate->invalidateBackgroundObscurationStatus();
parentToInvalidate = parentToInvalidate->parent();
}
}
if (isRoot() || isBody())
document().view()->recalculateScrollbarOverlayStyle();
updateShapeOutsideInfoAfterStyleChange(*style(), oldStyle);
updateGridPositionAfterStyleChange(oldStyle);
}
void RenderBox::updateShapeOutsideInfoAfterStyleChange(const RenderStyle& style, const RenderStyle* oldStyle)
{
const ShapeValue* shapeOutside = style.shapeOutside();
const ShapeValue* oldShapeOutside = oldStyle ? oldStyle->shapeOutside() : RenderStyle::initialShapeOutside();
Length shapeMargin = style.shapeMargin();
Length oldShapeMargin = oldStyle ? oldStyle->shapeMargin() : RenderStyle::initialShapeMargin();
// FIXME: A future optimization would do a deep comparison for equality. (bug 100811)
if (shapeOutside == oldShapeOutside && shapeMargin == oldShapeMargin)
return;
if (!shapeOutside)
ShapeOutsideInfo::removeInfo(this);
else
ShapeOutsideInfo::ensureInfo(this)->dirtyShapeSize();
if (shapeOutside || shapeOutside != oldShapeOutside)
markShapeOutsideDependentsForLayout();
}
void RenderBox::updateGridPositionAfterStyleChange(const RenderStyle* oldStyle)
{
if (!oldStyle || !parent() || !parent()->isRenderGrid())
return;
if (oldStyle->gridColumnStart() == style()->gridColumnStart()
&& oldStyle->gridColumnEnd() == style()->gridColumnEnd()
&& oldStyle->gridRowStart() == style()->gridRowStart()
&& oldStyle->gridRowEnd() == style()->gridRowEnd()
&& oldStyle->order() == style()->order()
&& oldStyle->hasOutOfFlowPosition() == style()->hasOutOfFlowPosition())
return;
// It should be possible to not dirty the grid in some cases (like moving an explicitly placed grid item).
// For now, it's more simple to just always recompute the grid.
toRenderGrid(parent())->dirtyGrid();
}
void RenderBox::updateFromStyle()
{
RenderBoxModelObject::updateFromStyle();
RenderStyle* styleToUse = style();
bool isRootObject = isRoot();
bool isViewObject = isRenderView();
// The root and the RenderView always paint their backgrounds/borders.
if (isRootObject || isViewObject)
setHasBoxDecorations(true);
setFloating(!isOutOfFlowPositioned() && styleToUse->isFloating());
// We also handle <body> and <html>, whose overflow applies to the viewport.
if (styleToUse->overflowX() != OVISIBLE && !isRootObject && isRenderBlock()) {
bool boxHasOverflowClip = true;
if (isBody()) {
// Overflow on the body can propagate to the viewport under the following conditions.
// (1) The root element is <html>.
// (2) We are the primary <body> (can be checked by looking at document.body).
// (3) The root element has visible overflow.
if (isHTMLHtmlElement(document().documentElement())
&& document().body() == node()
&& document().documentElement()->renderer()->style()->overflowX() == OVISIBLE)
boxHasOverflowClip = false;
}
// Check for overflow clip.
// It's sufficient to just check one direction, since it's illegal to have visible on only one overflow value.
if (boxHasOverflowClip) {
if (!s_hadOverflowClip)
// Erase the overflow
repaint();
setHasOverflowClip();
}
}
setHasTransform(styleToUse->hasTransformRelatedProperty());
setHasReflection(styleToUse->boxReflect());
}
void RenderBox::layout()
{
ASSERT(needsLayout());
LayoutRectRecorder recorder(*this);
RenderObject* child = firstChild();
if (!child) {
clearNeedsLayout();
return;
}
LayoutStateMaintainer statePusher(view(), this, locationOffset(), style()->isFlippedBlocksWritingMode());
while (child) {
child->layoutIfNeeded();
ASSERT(!child->needsLayout());
child = child->nextSibling();
}
statePusher.pop();
invalidateBackgroundObscurationStatus();
clearNeedsLayout();
}
// More IE extensions. clientWidth and clientHeight represent the interior of an object
// excluding border and scrollbar.
LayoutUnit RenderBox::clientWidth() const
{
return width() - borderLeft() - borderRight() - verticalScrollbarWidth();
}
LayoutUnit RenderBox::clientHeight() const
{
return height() - borderTop() - borderBottom() - horizontalScrollbarHeight();
}
int RenderBox::pixelSnappedClientWidth() const
{
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());
}
bool RenderBox::canDetermineWidthWithoutLayout() const
{
// FIXME: This optimization is incorrect as written.
// We need to be able to opt-in to this behavior only when
// it's guarentted correct.
// Until then disabling this optimization to be safe.
return false;
// FIXME: There are likely many subclasses of RenderBlockFlow which
// cannot determine their layout just from style!
// Perhaps we should create a "PlainRenderBlockFlow"
// and move this optimization there?
if (!isRenderBlockFlow()
// Flexbox items can be expanded beyond their width.
|| isFlexItemIncludingDeprecated()
// Table Layout controls cell size and can expand beyond width.
|| isTableCell())
return false;
RenderStyle* style = this->style();
return style->width().isFixed()
&& style->minWidth().isFixed()
&& (style->maxWidth().isUndefined() || style->maxWidth().isFixed())
&& style->paddingLeft().isFixed()
&& style->paddingRight().isFixed()
&& style->boxSizing() == CONTENT_BOX;
}
LayoutUnit RenderBox::fixedOffsetWidth() const
{
ASSERT(canDetermineWidthWithoutLayout());
RenderStyle* style = this->style();
LayoutUnit width = std::max(LayoutUnit(style->minWidth().value()), LayoutUnit(style->width().value()));
if (style->maxWidth().isFixed())
width = std::min(LayoutUnit(style->maxWidth().value()), width);
LayoutUnit borderLeft = style->borderLeft().nonZero() ? style->borderLeft().width() : 0;
LayoutUnit borderRight = style->borderRight().nonZero() ? style->borderRight().width() : 0;
return width + borderLeft + borderRight + style->paddingLeft().value() + style->paddingRight().value();
}
int 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 snapSizeToPixel(max(clientWidth(), layoutOverflowRect().maxX() - borderLeft()), x() + clientLeft());
return clientWidth() - min<LayoutUnit>(0, layoutOverflowRect().x() - borderLeft());
}
int 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 snapSizeToPixel(max(clientHeight(), layoutOverflowRect().maxY() - borderTop()), y() + clientTop());
}
int RenderBox::scrollLeft() const
{
return hasOverflowClip() ? layer()->scrollableArea()->scrollXOffset() : 0;
}
int RenderBox::scrollTop() const
{
return hasOverflowClip() ? layer()->scrollableArea()->scrollYOffset() : 0;
}
void RenderBox::setScrollLeft(int newLeft)
{
if (hasOverflowClip())
layer()->scrollableArea()->scrollToXOffset(newLeft, ScrollOffsetClamped);
}
void RenderBox::setScrollTop(int newTop)
{
if (hasOverflowClip())
layer()->scrollableArea()->scrollToYOffset(newTop, ScrollOffsetClamped);
}
void RenderBox::scrollToOffset(const IntSize& offset)
{
ASSERT(hasOverflowClip());
layer()->scrollableArea()->scrollToOffset(offset, ScrollOffsetClamped);
}
static inline bool frameElementAndViewPermitScroll(HTMLFrameElementBase* frameElementBase, FrameView* frameView)
{
// If scrollbars aren't explicitly forbidden, permit scrolling.
if (frameElementBase && frameElementBase->scrollingMode() != ScrollbarAlwaysOff)
return true;
// If scrollbars are forbidden, user initiated scrolls should obviously be ignored.
if (frameView->wasScrolledByUser())
return false;
// Forbid autoscrolls when scrollbars are off, but permits other programmatic scrolls,
// like navigation to an anchor.
Page* page = frameView->frame().page();
if (!page)
return false;
return !page->autoscrollController().autoscrollInProgress();
}
void RenderBox::scrollRectToVisible(const LayoutRect& rect, const ScrollAlignment& alignX, const ScrollAlignment& alignY)
{
RenderBox* parentBox = 0;
LayoutRect newRect = rect;
bool restrictedByLineClamp = false;
if (parent()) {
parentBox = parent()->enclosingBox();
restrictedByLineClamp = !parent()->style()->lineClamp().isNone();
}
if (hasOverflowClip() && !restrictedByLineClamp) {
// 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);
} else if (!parentBox && canBeProgramaticallyScrolled()) {
if (FrameView* frameView = this->frameView()) {
Element* ownerElement = document().ownerElement();
if (ownerElement && ownerElement->renderer()) {
HTMLFrameElementBase* frameElementBase = 0;
if (ownerElement->hasTagName(frameTag) || ownerElement->hasTagName(iframeTag))
frameElementBase = toHTMLFrameElementBase(ownerElement);
if (frameElementAndViewPermitScroll(frameElementBase, frameView)) {
LayoutRect viewRect = frameView->visibleContentRect();
LayoutRect exposeRect = ScrollAlignment::getRectToExpose(viewRect, rect, alignX, alignY);
int xOffset = roundToInt(exposeRect.x());
int yOffset = roundToInt(exposeRect.y());
// Adjust offsets if they're outside of the allowable range.
xOffset = max(0, min(frameView->contentsWidth(), xOffset));
yOffset = max(0, min(frameView->contentsHeight(), yOffset));
frameView->setScrollPosition(IntPoint(xOffset, yOffset));
if (frameView->safeToPropagateScrollToParent()) {
parentBox = ownerElement->renderer()->enclosingBox();
// FIXME: This doesn't correctly convert the rect to
// absolute coordinates in the parent.
newRect.setX(rect.x() - frameView->scrollX() + frameView->x());
newRect.setY(rect.y() - frameView->scrollY() + frameView->y());
} else {
parentBox = 0;
}
}
} else {
LayoutRect viewRect = frameView->visibleContentRect();
LayoutRect r = ScrollAlignment::getRectToExpose(viewRect, rect, alignX, alignY);
frameView->setScrollPosition(roundedIntPoint(r.location()));
}
}
}
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, bool* wasFixed) const
{
quads.append(localToAbsoluteQuad(FloatRect(0, 0, width(), height()), 0 /* mode */, wasFixed));
}
void RenderBox::updateLayerTransform()
{
// Transform-origin depends on box size, so we need to update the layer transform after layout.
if (hasLayer())
layer()->updateTransform();
}
LayoutUnit RenderBox::constrainLogicalWidthInRegionByMinMax(LayoutUnit logicalWidth, LayoutUnit availableWidth, RenderBlock* cb, RenderRegion* region) const
{
RenderStyle* styleToUse = style();
if (!styleToUse->logicalMaxWidth().isUndefined())
logicalWidth = min(logicalWidth, computeLogicalWidthInRegionUsing(MaxSize, styleToUse->logicalMaxWidth(), availableWidth, cb, region));
return max(logicalWidth, computeLogicalWidthInRegionUsing(MinSize, styleToUse->logicalMinWidth(), availableWidth, cb, region));
}
LayoutUnit RenderBox::constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const
{
RenderStyle* styleToUse = style();
if (!styleToUse->logicalMaxHeight().isUndefined()) {
LayoutUnit maxH = computeLogicalHeightUsing(styleToUse->logicalMaxHeight(), intrinsicContentHeight);
if (maxH != -1)
logicalHeight = min(logicalHeight, maxH);
}
return max(logicalHeight, computeLogicalHeightUsing(styleToUse->logicalMinHeight(), intrinsicContentHeight));
}
LayoutUnit RenderBox::constrainContentBoxLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const
{
RenderStyle* styleToUse = style();
if (!styleToUse->logicalMaxHeight().isUndefined()) {
LayoutUnit maxH = computeContentLogicalHeight(styleToUse->logicalMaxHeight(), intrinsicContentHeight);
if (maxH != -1)
logicalHeight = min(logicalHeight, maxH);
}
return 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));
}
LayoutRect RenderBox::outlineBoundsForRepaint(const RenderLayerModelObject* repaintContainer, const RenderGeometryMap* geometryMap) const
{
LayoutRect box = borderBoundingBox();
adjustRectForOutlineAndShadow(box);
if (repaintContainer != this) {
FloatQuad containerRelativeQuad;
if (geometryMap)
containerRelativeQuad = geometryMap->mapToContainer(box, repaintContainer);
else
containerRelativeQuad = localToContainerQuad(FloatRect(box), repaintContainer);
box = containerRelativeQuad.enclosingBoundingBox();
}
// FIXME: layoutDelta needs to be applied in parts before/after transforms and
// repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
box.move(view()->layoutDelta());
return box;
}
void RenderBox::addFocusRingRects(Vector<IntRect>& rects, const LayoutPoint& additionalOffset, const RenderLayerModelObject*)
{
if (!size().isEmpty())
rects.append(pixelSnappedIntRect(additionalOffset, size()));
}
bool RenderBox::canResize() const
{
// We need a special case for <iframe> because they never have
// hasOverflowClip(). However, they do "implicitly" clip their contents, so
// we want to allow resizing them also.
return (hasOverflowClip() || isRenderIFrame()) && style()->resize() != RESIZE_NONE;
}
void RenderBox::addLayerHitTestRects(LayerHitTestRects& layerRects, const RenderLayer* currentLayer, const LayoutPoint& layerOffset, const LayoutRect& containerRect) const
{
LayoutPoint adjustedLayerOffset = layerOffset + locationOffset();
RenderBoxModelObject::addLayerHitTestRects(layerRects, currentLayer, adjustedLayerOffset, containerRect);
}
void RenderBox::computeSelfHitTestRects(Vector<LayoutRect>& rects, const LayoutPoint& layerOffset) const
{
if (!size().isEmpty())
rects.append(LayoutRect(layerOffset, size()));
}
LayoutRect RenderBox::reflectionBox() const
{
LayoutRect result;
if (!style()->boxReflect())
return result;
LayoutRect box = borderBoxRect();
result = box;
switch (style()->boxReflect()->direction()) {
case ReflectionBelow:
result.move(0, box.height() + reflectionOffset());
break;
case ReflectionAbove:
result.move(0, -box.height() - reflectionOffset());
break;
case ReflectionLeft:
result.move(-box.width() - reflectionOffset(), 0);
break;
case ReflectionRight:
result.move(box.width() + reflectionOffset(), 0);
break;
}
return result;
}
int RenderBox::reflectionOffset() const
{
if (!style()->boxReflect())
return 0;
RenderView* renderView = view();
if (style()->boxReflect()->direction() == ReflectionLeft || style()->boxReflect()->direction() == ReflectionRight)
return valueForLength(style()->boxReflect()->offset(), borderBoxRect().width(), renderView);
return valueForLength(style()->boxReflect()->offset(), borderBoxRect().height(), renderView);
}
LayoutRect RenderBox::reflectedRect(const LayoutRect& r) const
{
if (!style()->boxReflect())
return LayoutRect();
LayoutRect box = borderBoxRect();
LayoutRect result = r;
switch (style()->boxReflect()->direction()) {
case ReflectionBelow:
result.setY(box.maxY() + reflectionOffset() + (box.maxY() - r.maxY()));
break;
case ReflectionAbove:
result.setY(box.y() - reflectionOffset() - box.height() + (box.maxY() - r.maxY()));
break;
case ReflectionLeft:
result.setX(box.x() - reflectionOffset() - box.width() + (box.maxX() - r.maxX()));
break;
case ReflectionRight:
result.setX(box.maxX() + reflectionOffset() + (box.maxX() - r.maxX()));
break;
}
return result;
}
int RenderBox::verticalScrollbarWidth() const
{
if (!hasOverflowClip() || style()->overflowY() == OOVERLAY)
return 0;
return layer()->scrollableArea()->verticalScrollbarWidth();
}
int RenderBox::horizontalScrollbarHeight() const
{
if (!hasOverflowClip() || style()->overflowX() == OOVERLAY)
return 0;
return layer()->scrollableArea()->horizontalScrollbarHeight();
}
int RenderBox::instrinsicScrollbarLogicalWidth() const
{
if (!hasOverflowClip())
return 0;
if (isHorizontalWritingMode() && style()->overflowY() == OSCROLL) {
ASSERT(layer()->scrollableArea() && layer()->scrollableArea()->hasVerticalScrollbar());
return verticalScrollbarWidth();
}
if (!isHorizontalWritingMode() && style()->overflowX() == OSCROLL) {
ASSERT(layer()->scrollableArea() && layer()->scrollableArea()->hasHorizontalScrollbar());
return horizontalScrollbarHeight();
}
return 0;
}
bool RenderBox::scrollImpl(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
{
RenderLayer* layer = this->layer();
return layer && layer->scrollableArea() && layer->scrollableArea()->scroll(direction, granularity, multiplier);
}
bool RenderBox::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier, Node** stopNode)
{
if (scrollImpl(direction, granularity, multiplier)) {
if (stopNode)
*stopNode = node();
return true;
}
if (stopNode && *stopNode && *stopNode == node())
return true;
RenderBlock* b = containingBlock();
if (b && !b->isRenderView())
return b->scroll(direction, granularity, multiplier, stopNode);
return false;
}
bool RenderBox::logicalScroll(ScrollLogicalDirection direction, ScrollGranularity granularity, float multiplier, Node** stopNode)
{
if (scrollImpl(logicalToPhysical(direction, isHorizontalWritingMode(), style()->isFlippedBlocksWritingMode()),
granularity, multiplier)) {
if (stopNode)
*stopNode = node();
return true;
}
if (stopNode && *stopNode && *stopNode == node())
return true;
RenderBlock* b = containingBlock();
if (b && !b->isRenderView())
return b->logicalScroll(direction, granularity, multiplier, stopNode);
return false;
}
bool RenderBox::canBeScrolledAndHasScrollableArea() const
{
return canBeProgramaticallyScrolled() && (scrollHeight() != clientHeight() || scrollWidth() != clientWidth());
}
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->rendererIsEditable();
}
bool RenderBox::usesCompositedScrolling() const
{
return hasOverflowClip() && hasLayer() && layer()->scrollableArea()->usesCompositedScrolling();
}
void RenderBox::autoscroll(const IntPoint& position)
{
Frame* 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);
}
// There are two kinds of renderer that can autoscroll.
bool RenderBox::canAutoscroll() const
{
if (node() && node()->isDocumentNode())
return view()->frameView()->isScrollable();
// Check for a box that can be scrolled in its own right.
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());
box.move(view()->frameView()->scrollOffset());
IntRect windowBox = view()->frameView()->contentsToWindow(box);
IntPoint windowAutoscrollPoint = windowPoint;
if (windowAutoscrollPoint.x() < windowBox.x() + autoscrollBeltSize)
windowAutoscrollPoint.move(-autoscrollBeltSize, 0);
else if (windowAutoscrollPoint.x() > windowBox.maxX() - autoscrollBeltSize)
windowAutoscrollPoint.move(autoscrollBeltSize, 0);
if (windowAutoscrollPoint.y() < windowBox.y() + autoscrollBeltSize)
windowAutoscrollPoint.move(0, -autoscrollBeltSize);
else if (windowAutoscrollPoint.y() > windowBox.maxY() - autoscrollBeltSize)
windowAutoscrollPoint.move(0, autoscrollBeltSize);
return windowAutoscrollPoint - windowPoint;
}
RenderBox* RenderBox::findAutoscrollable(RenderObject* renderer)
{
while (renderer && !(renderer->isBox() && toRenderBox(renderer)->canAutoscroll())) {
if (!renderer->parent() && renderer->node() == renderer->document() && renderer->document().ownerElement())
renderer = renderer->document().ownerElement()->renderer();
else
renderer = renderer->parent();
}
return renderer && renderer->isBox() ? toRenderBox(renderer) : 0;
}
static inline int adjustedScrollDelta(int beginningDelta)
{
// This implemention matches Firefox's.
// http://mxr.mozilla.org/firefox/source/toolkit/content/widgets/browser.xml#856.
const int speedReducer = 12;
int adjustedDelta = beginningDelta / speedReducer;
if (adjustedDelta > 1)
adjustedDelta = static_cast<int>(adjustedDelta * sqrt(static_cast<double>(adjustedDelta))) - 1;
else if (adjustedDelta < -1)
adjustedDelta = static_cast<int>(adjustedDelta * sqrt(static_cast<double>(-adjustedDelta))) + 1;
return adjustedDelta;
}
static inline IntSize adjustedScrollDelta(const IntSize& delta)
{
return IntSize(adjustedScrollDelta(delta.width()), adjustedScrollDelta(delta.height()));
}
void RenderBox::panScroll(const IntPoint& sourcePoint)
{
Frame* frame = this->frame();
if (!frame)
return;
IntPoint lastKnownMousePosition = frame->eventHandler().lastKnownMousePosition();
// We need to check if the last known mouse position is out of the window. When the mouse is out of the window, the position is incoherent
static IntPoint previousMousePosition;
if (lastKnownMousePosition.x() < 0 || lastKnownMousePosition.y() < 0)
lastKnownMousePosition = previousMousePosition;
else
previousMousePosition = lastKnownMousePosition;
IntSize delta = lastKnownMousePosition - sourcePoint;
if (abs(delta.width()) <= ScrollView::noPanScrollRadius) // at the center we let the space for the icon
delta.setWidth(0);
if (abs(delta.height()) <= ScrollView::noPanScrollRadius)
delta.setHeight(0);
scrollByRecursively(adjustedScrollDelta(delta), ScrollOffsetClamped);
}
void RenderBox::scrollByRecursively(const IntSize& delta, ScrollOffsetClamping clamp)
{
if (delta.isZero())
return;
bool restrictedByLineClamp = false;
if (parent())
restrictedByLineClamp = !parent()->style()->lineClamp().isNone();
if (hasOverflowClip() && !restrictedByLineClamp) {
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);
Frame* frame = this->frame();
if (frame && frame->page())
frame->page()->autoscrollController().updateAutoscrollRenderer();
}
} else if (view()->frameView()) {
// If we are here, we were called on a renderer that can be programmatically scrolled, but doesn't
// have an overflow clip. Which means that it is a document node that can be scrolled.
view()->frameView()->scrollBy(delta);
// FIXME: If we didn't scroll the whole way, do we want to try looking at the frames ownerElement?
// https://bugs.webkit.org/show_bug.cgi?id=28237
}
}
bool RenderBox::needsPreferredWidthsRecalculation() const
{
return style()->paddingStart().isPercent() || style()->paddingEnd().isPercent();
}
IntSize RenderBox::scrolledContentOffset() const
{
ASSERT(hasOverflowClip());
ASSERT(hasLayer());
return layer()->scrollableArea()->scrollOffset();
}
LayoutSize RenderBox::cachedSizeForOverflowClip() const
{
ASSERT(hasOverflowClip());
ASSERT(hasLayer());
return layer()->size();
}
void RenderBox::applyCachedClipAndScrollOffsetForRepaint(LayoutRect& paintRect) const
{
paintRect.move(-scrolledContentOffset()); // For overflow:auto/scroll/hidden.
// Do not clip scroll layer contents to reduce the number of repaints while scrolling.
if (usesCompositedScrolling())
return;
// height() is inaccurate if we're in the middle of a layout of this RenderBox, so use the
// layer's size instead. Even if the layer's size is wrong, the layer itself will repaint
// anyway if its size does change.
LayoutRect clipRect(LayoutPoint(), cachedSizeForOverflowClip());
paintRect = intersection(paintRect, clipRect);
}
void RenderBox::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
minLogicalWidth = minPreferredLogicalWidth() - borderAndPaddingLogicalWidth();
maxLogicalWidth = maxPreferredLogicalWidth() - borderAndPaddingLogicalWidth();
}
LayoutUnit RenderBox::minPreferredLogicalWidth() const
{
if (preferredLogicalWidthsDirty()) {
#ifndef NDEBUG
SetLayoutNeededForbiddenScope layoutForbiddenScope(const_cast<RenderBox*>(this));
#endif
const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
}
return m_minPreferredLogicalWidth;
}
LayoutUnit RenderBox::maxPreferredLogicalWidth() const
{
if (preferredLogicalWidthsDirty()) {
#ifndef NDEBUG
SetLayoutNeededForbiddenScope layoutForbiddenScope(const_cast<RenderBox*>(this));
#endif
const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
}
return m_maxPreferredLogicalWidth;
}
bool RenderBox::hasOverrideHeight() const
{
return gOverrideHeightMap && gOverrideHeightMap->contains(this);
}
bool RenderBox::hasOverrideWidth() const
{
return gOverrideWidthMap && gOverrideWidthMap->contains(this);
}
void RenderBox::setOverrideLogicalContentHeight(LayoutUnit height)
{
if (!gOverrideHeightMap)
gOverrideHeightMap = new OverrideSizeMap();
gOverrideHeightMap->set(this, height);
}
void RenderBox::setOverrideLogicalContentWidth(LayoutUnit width)
{
if (!gOverrideWidthMap)
gOverrideWidthMap = new OverrideSizeMap();
gOverrideWidthMap->set(this, width);
}
void RenderBox::clearOverrideLogicalContentHeight()
{
if (gOverrideHeightMap)
gOverrideHeightMap->remove(this);
}
void RenderBox::clearOverrideLogicalContentWidth()
{
if (gOverrideWidthMap)
gOverrideWidthMap->remove(this);
}
void RenderBox::clearOverrideSize()
{
clearOverrideLogicalContentHeight();
clearOverrideLogicalContentWidth();
}
LayoutUnit RenderBox::overrideLogicalContentWidth() const
{
ASSERT(hasOverrideWidth());
return gOverrideWidthMap->get(this);
}
LayoutUnit RenderBox::overrideLogicalContentHeight() const
{
ASSERT(hasOverrideHeight());
return gOverrideHeightMap->get(this);
}
LayoutUnit RenderBox::overrideContainingBlockContentLogicalWidth() const
{
ASSERT(hasOverrideContainingBlockLogicalWidth());
return gOverrideContainingBlockLogicalWidthMap->get(this);
}
LayoutUnit RenderBox::overrideContainingBlockContentLogicalHeight() const
{
ASSERT(hasOverrideContainingBlockLogicalHeight());
return gOverrideContainingBlockLogicalHeightMap->get(this);
}
bool RenderBox::hasOverrideContainingBlockLogicalWidth() const
{
return gOverrideContainingBlockLogicalWidthMap && gOverrideContainingBlockLogicalWidthMap->contains(this);
}
bool RenderBox::hasOverrideContainingBlockLogicalHeight() const
{
return gOverrideContainingBlockLogicalHeightMap && gOverrideContainingBlockLogicalHeightMap->contains(this);
}
void RenderBox::setOverrideContainingBlockContentLogicalWidth(LayoutUnit logicalWidth)
{
if (!gOverrideContainingBlockLogicalWidthMap)
gOverrideContainingBlockLogicalWidthMap = new OverrideSizeMap;
gOverrideContainingBlockLogicalWidthMap->set(this, logicalWidth);
}
void RenderBox::setOverrideContainingBlockContentLogicalHeight(LayoutUnit logicalHeight)
{
if (!gOverrideContainingBlockLogicalHeightMap)
gOverrideContainingBlockLogicalHeightMap = new OverrideSizeMap;
gOverrideContainingBlockLogicalHeightMap->set(this, logicalHeight);
}
void RenderBox::clearContainingBlockOverrideSize()
{
if (gOverrideContainingBlockLogicalWidthMap)
gOverrideContainingBlockLogicalWidthMap->remove(this);
clearOverrideContainingBlockContentLogicalHeight();
}
void RenderBox::clearOverrideContainingBlockContentLogicalHeight()
{
if (gOverrideContainingBlockLogicalHeightMap)
gOverrideContainingBlockLogicalHeightMap->remove(this);
}
LayoutUnit RenderBox::adjustBorderBoxLogicalWidthForBoxSizing(LayoutUnit width) const
{
LayoutUnit bordersPlusPadding = borderAndPaddingLogicalWidth();
if (style()->boxSizing() == CONTENT_BOX)
return width + bordersPlusPadding;
return max(width, bordersPlusPadding);
}
LayoutUnit RenderBox::adjustBorderBoxLogicalHeightForBoxSizing(LayoutUnit height) const
{
LayoutUnit bordersPlusPadding = borderAndPaddingLogicalHeight();
if (style()->boxSizing() == CONTENT_BOX)
return height + bordersPlusPadding;
return max(height, bordersPlusPadding);
}
LayoutUnit RenderBox::adjustContentBoxLogicalWidthForBoxSizing(LayoutUnit width) const
{
if (style()->boxSizing() == BORDER_BOX)
width -= borderAndPaddingLogicalWidth();
return max<LayoutUnit>(0, width);
}
LayoutUnit RenderBox::adjustContentBoxLogicalHeightForBoxSizing(LayoutUnit height) const
{
if (style()->boxSizing() == BORDER_BOX)
height -= borderAndPaddingLogicalHeight();
return max<LayoutUnit>(0, height);
}
// Hit Testing
bool RenderBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, HitTestAction action)
{
LayoutPoint adjustedLocation = accumulatedOffset + location();
// Check kids first.
for (RenderObject* child = lastChild(); child; child = child->previousSibling()) {
if (!child->hasLayer() && child->nodeAtPoint(request, result, locationInContainer, adjustedLocation, action)) {
updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
return true;
}
}
// Check our bounds next. For this purpose always assume that we can only be hit in the
// foreground phase (which is true for replaced elements like images).
LayoutRect boundsRect = borderBoxRectInRegion(locationInContainer.region());
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 = firstChild(); child; child = child->nextSibling())
child->paint(childInfo, adjustedPaintOffset);
}
void RenderBox::paintRootBoxFillLayers(const PaintInfo& paintInfo)
{
if (paintInfo.skipRootBackground())
return;
RenderObject* rootBackgroundRenderer = rendererForRootBackground();
const FillLayer* bgLayer = rootBackgroundRenderer->style()->backgroundLayers();
Color bgColor = rootBackgroundRenderer->resolveColor(CSSPropertyBackgroundColor);
paintFillLayers(paintInfo, bgColor, bgLayer, view()->backgroundRect(this), BackgroundBleedNone, CompositeSourceOver, rootBackgroundRenderer);
}
BackgroundBleedAvoidance RenderBox::determineBackgroundBleedAvoidance(GraphicsContext* context) const
{
if (context->paintingDisabled())
return BackgroundBleedNone;
const RenderStyle* style = this->style();
if (!style->hasBackground() || !style->hasBorder() || !style->hasBorderRadius() || borderImageIsLoadedAndCanBeRendered())
return BackgroundBleedNone;
AffineTransform ctm = context->getCTM();
FloatSize contextScaling(static_cast<float>(ctm.xScale()), static_cast<float>(ctm.yScale()));
// Because RoundedRect uses IntRect internally the inset applied by the
// BackgroundBleedShrinkBackground strategy cannot be less than one integer
// layout coordinate, even with subpixel layout enabled. To take that into
// account, we clamp the contextScaling to 1.0 for the following test so
// that borderObscuresBackgroundEdge can only return true if the border
// widths are greater than 2 in both layout coordinates and screen
// coordinates.
// This precaution will become obsolete if RoundedRect is ever promoted to
// a sub-pixel representation.
if (contextScaling.width() > 1)
contextScaling.setWidth(1);
if (contextScaling.height() > 1)
contextScaling.setHeight(1);
if (borderObscuresBackgroundEdge(contextScaling))
return BackgroundBleedShrinkBackground;
if (!style->hasAppearance() && borderObscuresBackground() && backgroundHasOpaqueTopLayer())
return BackgroundBleedBackgroundOverBorder;
return BackgroundBleedUseTransparencyLayer;
}
void RenderBox::paintBoxDecorations(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(this))
return;
LayoutRect paintRect = borderBoxRectInRegion(paintInfo.renderRegion);
paintRect.moveBy(paintOffset);
paintBoxDecorationsWithRect(paintInfo, paintOffset, paintRect);
}
void RenderBox::paintBoxDecorationsWithRect(PaintInfo& paintInfo, const LayoutPoint& paintOffset, const LayoutRect& paintRect)
{
BackgroundBleedAvoidance bleedAvoidance = determineBackgroundBleedAvoidance(paintInfo.context);
// FIXME: Should eventually give the theme control over whether the box shadow should paint, since controls could have
// custom shadows of their own.
if (!boxShadowShouldBeAppliedToBackground(bleedAvoidance))
paintBoxShadow(paintInfo, paintRect, style(), Normal);
GraphicsContextStateSaver stateSaver(*paintInfo.context, false);
if (bleedAvoidance == BackgroundBleedUseTransparencyLayer) {
// To avoid the background color bleeding out behind the border, we'll render background and border
// into a transparency layer, and then clip that in one go (which requires setting up the clip before
// beginning the layer).
RoundedRect border = style()->getRoundedBorderFor(paintRect, view());
stateSaver.save();
paintInfo.context->clipRoundedRect(border);
paintInfo.context->beginTransparencyLayer(1);
}
paintBackgroundWithBorderAndBoxShadow(paintInfo, paintRect, bleedAvoidance);
if (bleedAvoidance == BackgroundBleedUseTransparencyLayer)
paintInfo.context->endLayer();
}
void RenderBox::paintBackgroundWithBorderAndBoxShadow(PaintInfo& paintInfo, const LayoutRect& paintRect, BackgroundBleedAvoidance bleedAvoidance)
{
// If we have a native theme appearance, paint that before painting our background.
// The theme will tell us whether or not we should also paint the CSS background.
IntRect snappedPaintRect(pixelSnappedIntRect(paintRect));
bool themePainted = style()->hasAppearance() && !RenderTheme::theme().paint(this, paintInfo, snappedPaintRect);
if (!themePainted) {
if (bleedAvoidance == BackgroundBleedBackgroundOverBorder)
paintBorder(paintInfo, paintRect, style(), bleedAvoidance);
paintBackground(paintInfo, paintRect, bleedAvoidance);
if (style()->hasAppearance())
RenderTheme::theme().paintDecorations(this, paintInfo, snappedPaintRect);
}
paintBoxShadow(paintInfo, paintRect, style(), Inset);
// The theme will tell us whether or not we should also paint the CSS border.
if (bleedAvoidance != BackgroundBleedBackgroundOverBorder && (!style()->hasAppearance() || (!themePainted && RenderTheme::theme().paintBorderOnly(this, paintInfo, snappedPaintRect))) && style()->hasBorder())
paintBorder(paintInfo, paintRect, style(), bleedAvoidance);
}
void RenderBox::paintBackground(const PaintInfo& paintInfo, const LayoutRect& paintRect, BackgroundBleedAvoidance bleedAvoidance)
{
if (isRoot()) {
paintRootBoxFillLayers(paintInfo);
return;
}
if (isBody() && skipBodyBackground(this))
return;
if (backgroundIsKnownToBeObscured())
return;
paintFillLayers(paintInfo, resolveColor(CSSPropertyBackgroundColor), style()->backgroundLayers(), paintRect, bleedAvoidance);
}
LayoutRect RenderBox::backgroundPaintedExtent() const
{
ASSERT(hasBackground());
LayoutRect backgroundRect = pixelSnappedIntRect(borderBoxRect());
Color backgroundColor = resolveColor(CSSPropertyBackgroundColor);
if (backgroundColor.isValid() && backgroundColor.alpha())
return backgroundRect;
if (!style()->backgroundLayers()->image() || style()->backgroundLayers()->next())
return backgroundRect;
BackgroundImageGeometry geometry;
const_cast<RenderBox*>(this)->calculateBackgroundImageGeometry(style()->backgroundLayers(), backgroundRect, geometry);
return geometry.destRect();
}
bool RenderBox::backgroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect) const
{
if (isBody() && skipBodyBackground(this))
return false;
Color backgroundColor = resolveColor(CSSPropertyBackgroundColor);
if (!backgroundColor.isValid() || backgroundColor.hasAlpha())
return false;
// If the element has appearance, it might be painted by theme.
// We cannot be sure if theme paints the background opaque.
// In this case it is safe to not assume opaqueness.
// FIXME: May be ask theme if it paints opaque.
if (style()->hasAppearance())
return false;
// FIXME: Check the opaqueness of background images.
// FIXME: Use rounded rect if border radius is present.
if (style()->hasBorderRadius())
return false;
// FIXME: The background color clip is defined by the last layer.
if (style()->backgroundLayers()->next())
return false;
LayoutRect backgroundRect;
switch (style()->backgroundClip()) {
case BorderFillBox:
backgroundRect = borderBoxRect();
break;
case PaddingFillBox:
backgroundRect = paddingBoxRect();
break;
case ContentFillBox:
backgroundRect = contentBoxRect();
break;
default:
break;
}
return backgroundRect.contains(localRect);
}
static bool isCandidateForOpaquenessTest(RenderBox* childBox)
{
RenderStyle* childStyle = childBox->style();
if (childStyle->position() != StaticPosition && childBox->containingBlock() != childBox->parent())
return false;
if (childStyle->visibility() != VISIBLE || childStyle->shapeOutside())
return false;
if (!childBox->width() || !childBox->height())
return false;
if (RenderLayer* childLayer = childBox->layer()) {
// FIXME: perhaps this could be less conservative?
if (childLayer->compositingState() != NotComposited)
return false;
// FIXME: Deal with z-index.
if (!childStyle->hasAutoZIndex())
return false;
if (childLayer->hasTransform() || childLayer->isTransparent() || childLayer->hasFilter())
return false;
if (childBox->hasOverflowClip() && childStyle->hasBorderRadius())
return false;
}
return true;
}
bool RenderBox::foregroundIsKnownToBeOpaqueInRect(const LayoutRect& localRect, unsigned maxDepthToTest) const
{
if (!maxDepthToTest)
return false;
for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
if (!child->isBox())
continue;
RenderBox* childBox = toRenderBox(child);
if (!isCandidateForOpaquenessTest(childBox))
continue;
LayoutPoint childLocation = childBox->location();
if (childBox->isRelPositioned())
childLocation.move(childBox->relativePositionOffset());
LayoutRect childLocalRect = localRect;
childLocalRect.moveBy(-childLocation);
if (childLocalRect.y() < 0 || childLocalRect.x() < 0) {
// If there is unobscured area above/left of a static positioned box then the rect is probably not covered.
if (childBox->style()->position() == StaticPosition)
return false;
continue;
}
if (childLocalRect.maxY() > childBox->height() || childLocalRect.maxX() > childBox->width())
continue;
if (childBox->backgroundIsKnownToBeOpaqueInRect(childLocalRect))
return true;
if (childBox->foregroundIsKnownToBeOpaqueInRect(childLocalRect, maxDepthToTest - 1))
return true;
}
return false;
}
bool RenderBox::computeBackgroundIsKnownToBeObscured()
{
// Test to see if the children trivially obscure the background.
// FIXME: This test can be much more comprehensive.
if (!hasBackground())
return false;
// Table and root background painting is special.
if (isTable() || isRoot())
return false;
// FIXME: box-shadow is painted while background painting.
if (style()->boxShadow())
return false;
LayoutRect backgroundRect = backgroundPaintedExtent();
return foregroundIsKnownToBeOpaqueInRect(backgroundRect, backgroundObscurationTestMaxDepth);
}
bool RenderBox::backgroundHasOpaqueTopLayer() const
{
const FillLayer* fillLayer = style()->backgroundLayers();
if (!fillLayer || fillLayer->clip() != BorderFillBox)
return false;
// Clipped with local scrolling
if (hasOverflowClip() && fillLayer->attachment() == LocalBackgroundAttachment)
return false;
if (fillLayer->hasOpaqueImage(this) && fillLayer->hasRepeatXY() && fillLayer->image()->canRender(this, style()->effectiveZoom()))
return true;
// If there is only one layer and no image, check whether the background color is opaque
if (!fillLayer->next() && !fillLayer->hasImage()) {
Color bgColor = resolveColor(CSSPropertyBackgroundColor);
if (bgColor.isValid() && bgColor.alpha() == 255)
return true;
}
return false;
}
void RenderBox::paintMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(this) || style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseMask || paintInfo.context->paintingDisabled())
return;
LayoutRect paintRect = LayoutRect(paintOffset, size());
paintMaskImages(paintInfo, paintRect);
}
void RenderBox::paintClippingMask(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
if (!paintInfo.shouldPaintWithinRoot(this) || style()->visibility() != VISIBLE || paintInfo.phase != PaintPhaseClippingMask || paintInfo.context->paintingDisabled())
return;
if (!layer() || layer()->compositingState() != PaintsIntoOwnBacking)
return;
// We should never have this state in this function. A layer with a mask
// should have always created its own backing if it became composited.
ASSERT(layer()->compositingState() != HasOwnBackingButPaintsIntoAncestor);
LayoutRect paintRect = LayoutRect(paintOffset, size());
paintInfo.context->fillRect(pixelSnappedIntRect(paintRect), Color::black);
}
void RenderBox::paintMaskImages(const PaintInfo& paintInfo, const LayoutRect& paintRect)
{
// Figure out if we need to push a transparency layer to render our mask.
bool pushTransparencyLayer = false;
bool compositedMask = hasLayer() && layer()->hasCompositedMask();
bool flattenCompositingLayers = view()->frameView() && view()->frameView()->paintBehavior() & PaintBehaviorFlattenCompositingLayers;
CompositeOperator compositeOp = CompositeSourceOver;
bool allMaskImagesLoaded = true;
if (!compositedMask || flattenCompositingLayers) {
pushTransparencyLayer = true;
StyleImage* maskBoxImage = style()->maskBoxImage().image();
const FillLayer* maskLayers = style()->maskLayers();
// Don't render a masked element until all the mask images have loaded, to prevent a flash of unmasked content.
if (maskBoxImage)
allMaskImagesLoaded &= maskBoxImage->isLoaded();
if (maskLayers)
allMaskImagesLoaded &= maskLayers->imagesAreLoaded();
paintInfo.context->setCompositeOperation(CompositeDestinationIn);
paintInfo.context->beginTransparencyLayer(1);
compositeOp = CompositeSourceOver;
}
if (allMaskImagesLoaded) {
paintFillLayers(paintInfo, Color(), style()->maskLayers(), paintRect, BackgroundBleedNone, compositeOp);
paintNinePieceImage(paintInfo.context, paintRect, style(), style()->maskBoxImage(), compositeOp);
}
if (pushTransparencyLayer)
paintInfo.context->endLayer();
}
LayoutRect RenderBox::maskClipRect()
{
const NinePieceImage& maskBoxImage = style()->maskBoxImage();
if (maskBoxImage.image()) {
LayoutRect borderImageRect = borderBoxRect();
// Apply outsets to the border box.
borderImageRect.expand(style()->maskBoxImageOutsets());
return borderImageRect;
}
LayoutRect result;
LayoutRect borderBox = borderBoxRect();
for (const FillLayer* maskLayer = style()->maskLayers(); maskLayer; maskLayer = maskLayer->next()) {
if (maskLayer->image()) {
BackgroundImageGeometry geometry;
calculateBackgroundImageGeometry(maskLayer, borderBox, geometry);
result.unite(geometry.destRect());
}
}
return result;
}
void RenderBox::paintFillLayers(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, CompositeOperator op, RenderObject* backgroundObject)
{
Vector<const FillLayer*, 8> layers;
const FillLayer* curLayer = fillLayer;
bool shouldDrawBackgroundInSeparateBuffer = false;
while (curLayer) {
layers.append(curLayer);
// Stop traversal when an opaque layer is encountered.
// FIXME : It would be possible for the following occlusion culling test to be more aggressive
// on layers with no repeat by testing whether the image covers the layout rect.
// Testing that here would imply duplicating a lot of calculations that are currently done in
// RenderBoxModelObject::paintFillLayerExtended. A more efficient solution might be to move
// the layer recursion into paintFillLayerExtended, or to compute the layer geometry here
// and pass it down.
if (!shouldDrawBackgroundInSeparateBuffer && curLayer->blendMode() != BlendModeNormal)
shouldDrawBackgroundInSeparateBuffer = true;
// The clipOccludesNextLayers condition must be evaluated first to avoid short-circuiting.
if (curLayer->clipOccludesNextLayers(curLayer == fillLayer) && curLayer->hasOpaqueImage(this) && curLayer->image()->canRender(this, style()->effectiveZoom()) && curLayer->hasRepeatXY() && curLayer->blendMode() == BlendModeNormal && !boxShadowShouldBeAppliedToBackground(bleedAvoidance))
break;
curLayer = curLayer->next();
}
GraphicsContext* context = paintInfo.context;
if (!context)
shouldDrawBackgroundInSeparateBuffer = false;
if (shouldDrawBackgroundInSeparateBuffer)
context->beginTransparencyLayer(1);
Vector<const FillLayer*>::const_reverse_iterator topLayer = layers.rend();
for (Vector<const FillLayer*>::const_reverse_iterator it = layers.rbegin(); it != topLayer; ++it)
paintFillLayer(paintInfo, c, *it, rect, bleedAvoidance, op, backgroundObject);
if (shouldDrawBackgroundInSeparateBuffer)
context->endLayer();
}
void RenderBox::paintFillLayer(const PaintInfo& paintInfo, const Color& c, const FillLayer* fillLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, CompositeOperator op, RenderObject* backgroundObject)
{
paintFillLayerExtended(paintInfo, c, fillLayer, rect, bleedAvoidance, 0, LayoutSize(), op, backgroundObject);
}
static bool layersUseImage(WrappedImagePtr image, const FillLayer* layers)
{
for (const FillLayer* curLayer = layers; curLayer; curLayer = curLayer->next()) {
if (curLayer->image() && image == curLayer->image()->data())
return true;
}
return false;
}
void RenderBox::imageChanged(WrappedImagePtr image, const IntRect*)
{
if (!parent())
return;
if ((style()->borderImage().image() && style()->borderImage().image()->data() == image) ||
(style()->maskBoxImage().image() && style()->maskBoxImage().image()->data() == image)) {
repaint();
return;
}
bool didFullRepaint = repaintLayerRectsForImage(image, style()->backgroundLayers(), true);
if (!didFullRepaint)
repaintLayerRectsForImage(image, style()->maskLayers(), false);
if (hasLayer() && layer()->hasCompositedMask() && layersUseImage(image, style()->maskLayers()))
layer()->contentChanged(MaskImageChanged);
}
bool RenderBox::repaintLayerRectsForImage(WrappedImagePtr image, const FillLayer* layers, bool drawingBackground)
{
LayoutRect rendererRect;
RenderBox* layerRenderer = 0;
for (const FillLayer* curLayer = layers; curLayer; curLayer = curLayer->next()) {
if (curLayer->image() && image == curLayer->image()->data() && curLayer->image()->canRender(this, style()->effectiveZoom())) {
// Now that we know this image is being used, compute the renderer and the rect
// if we haven't already
if (!layerRenderer) {
bool drawingRootBackground = drawingBackground && (isRoot() || (isBody() && !document().documentElement()->renderer()->hasBackground()));
if (drawingRootBackground) {
layerRenderer = view();
LayoutUnit rw;
LayoutUnit rh;
if (FrameView* frameView = toRenderView(layerRenderer)->frameView()) {
rw = frameView->contentsWidth();
rh = frameView->contentsHeight();
} else {
rw = layerRenderer->width();
rh = layerRenderer->height();
}
rendererRect = LayoutRect(-layerRenderer->marginLeft(),
-layerRenderer->marginTop(),
max(layerRenderer->width() + layerRenderer->marginWidth() + layerRenderer->borderLeft() + layerRenderer->borderRight(), rw),
max(layerRenderer->height() + layerRenderer->marginHeight() + layerRenderer->borderTop() + layerRenderer->borderBottom(), rh));
} else {
layerRenderer = this;
rendererRect = borderBoxRect();
}
}
BackgroundImageGeometry geometry;
layerRenderer->calculateBackgroundImageGeometry(curLayer, rendererRect, geometry);
layerRenderer->repaintRectangle(geometry.destRect());
if (geometry.destRect() == rendererRect)
return true;
}
}
return false;
}
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, paintInfo.renderRegion);
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;
// FIXME: Get rid of this slop from here and elsewhere.
// Instead, properly include the outline in visual overflow.
if (RenderView* view = this->view())
contentsVisualOverflow.inflate(view->maximalOutlineSize());
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, RenderRegion* region, OverlayScrollbarSizeRelevancy relevancy)
{
// FIXME: When overflow-clip (CSS3) is implemented, we'll obtain the property
// here.
LayoutRect clipRect = borderBoxRectInRegion(region);
clipRect.setLocation(location + clipRect.location() + LayoutSize(borderLeft(), borderTop()));
clipRect.setSize(clipRect.size() - LayoutSize(borderLeft() + borderRight(), borderTop() + borderBottom()));
if (!hasOverflowClip())
return clipRect;
// Subtract out scrollbars if we have them.
if (style()->shouldPlaceBlockDirectionScrollbarOnLogicalLeft())
clipRect.move(layer()->scrollableArea()->verticalScrollbarWidth(relevancy), 0);
clipRect.contract(layer()->scrollableArea()->verticalScrollbarWidth(relevancy), layer()->scrollableArea()->horizontalScrollbarHeight(relevancy));
return clipRect;
}
LayoutRect RenderBox::clipRect(const LayoutPoint& location, RenderRegion* region)
{
LayoutRect borderBoxRect = borderBoxRectInRegion(region);
LayoutRect clipRect = LayoutRect(borderBoxRect.location() + location, borderBoxRect.size());
RenderView* renderView = view();
if (!style()->clipLeft().isAuto()) {
LayoutUnit c = valueForLength(style()->clipLeft(), borderBoxRect.width(), renderView);
clipRect.move(c, 0);
clipRect.contract(c, 0);
}
// We don't use the region-specific border box's width and height since clip offsets are (stupidly) specified
// from the left and top edges. Therefore it's better to avoid constraining to smaller widths and heights.
if (!style()->clipRight().isAuto())
clipRect.contract(width() - valueForLength(style()->clipRight(), width(), renderView), 0);
if (!style()->clipTop().isAuto()) {
LayoutUnit c = valueForLength(style()->clipTop(), borderBoxRect.height(), renderView);
clipRect.move(0, c);
clipRect.contract(0, c);
}
if (!style()->clipBottom().isAuto())
clipRect.contract(0, height() - valueForLength(style()->clipBottom(), height(), renderView));
return clipRect;
}
LayoutUnit RenderBox::shrinkLogicalWidthToAvoidFloats(LayoutUnit childMarginStart, LayoutUnit childMarginEnd, const RenderBlockFlow* cb, RenderRegion* region) const
{
RenderRegion* containingBlockRegion = 0;
LayoutUnit logicalTopPosition = logicalTop();
if (region) {
LayoutUnit offsetFromLogicalTopOfRegion = region ? region->logicalTopForFlowThreadContent() - offsetFromLogicalTopOfFirstPage() : LayoutUnit();
logicalTopPosition = max(logicalTopPosition, logicalTopPosition + offsetFromLogicalTopOfRegion);
containingBlockRegion = cb->clampToStartAndEndRegions(region);
}
LayoutUnit result = cb->availableLogicalWidthForLineInRegion(logicalTopPosition, false, containingBlockRegion) - childMarginStart - childMarginEnd;
// We need to see if margins on either the start side or the end side can contain the floats in question. If they can,
// then just using the line width is inaccurate. In the case where a float completely fits, we don't need to use the line
// offset at all, but can instead push all the way to the content edge of the containing block. In the case where the float
// doesn't fit, we can use the line offset, but we need to grow it by the margin to reflect the fact that the margin was
// "consumed" by the float. Negative margins aren't consumed by the float, and so we ignore them.
if (childMarginStart > 0) {
LayoutUnit startContentSide = cb->startOffsetForContent(containingBlockRegion);
LayoutUnit startContentSideWithMargin = startContentSide + childMarginStart;
LayoutUnit startOffset = cb->startOffsetForLineInRegion(logicalTopPosition, false, containingBlockRegion);
if (startOffset > startContentSideWithMargin)
result += childMarginStart;
else
result += startOffset - startContentSide;
}
if (childMarginEnd > 0) {
LayoutUnit endContentSide = cb->endOffsetForContent(containingBlockRegion);
LayoutUnit endContentSideWithMargin = endContentSide + childMarginEnd;
LayoutUnit endOffset = cb->endOffsetForLineInRegion(logicalTopPosition, false, containingBlockRegion);
if (endOffset > endContentSideWithMargin)
result += childMarginEnd;
else
result += endOffset - endContentSide;
}
return result;
}
LayoutUnit RenderBox::containingBlockLogicalWidthForContent() const
{
if (hasOverrideContainingBlockLogicalWidth())
return overrideContainingBlockContentLogicalWidth();
RenderBlock* cb = containingBlock();
return cb->availableLogicalWidth();
}
LayoutUnit RenderBox::containingBlockLogicalHeightForContent(AvailableLogicalHeightType heightType) const
{
if (hasOverrideContainingBlockLogicalHeight())
return overrideContainingBlockContentLogicalHeight();
RenderBlock* cb = containingBlock();
return cb->availableLogicalHeight(heightType);
}
LayoutUnit RenderBox::containingBlockLogicalWidthForContentInRegion(RenderRegion* region) const
{
if (!region)
return containingBlockLogicalWidthForContent();
RenderBlock* cb = containingBlock();
RenderRegion* containingBlockRegion = cb->clampToStartAndEndRegions(region);
// FIXME: It's unclear if a region's content should use the containing block's override logical width.
// If it should, the following line should call containingBlockLogicalWidthForContent.
LayoutUnit result = cb->availableLogicalWidth();
RenderBoxRegionInfo* boxInfo = cb->renderBoxRegionInfo(containingBlockRegion);
if (!boxInfo)
return result;
return max<LayoutUnit>(0, result - (cb->logicalWidth() - boxInfo->logicalWidth()));
}
LayoutUnit RenderBox::containingBlockAvailableLineWidthInRegion(RenderRegion* region) const
{
RenderBlock* cb = containingBlock();
RenderRegion* containingBlockRegion = 0;
LayoutUnit logicalTopPosition = logicalTop();
if (region) {
LayoutUnit offsetFromLogicalTopOfRegion = region ? region->logicalTopForFlowThreadContent() - offsetFromLogicalTopOfFirstPage() : LayoutUnit();
logicalTopPosition = max(logicalTopPosition, logicalTopPosition + offsetFromLogicalTopOfRegion);
containingBlockRegion = cb->clampToStartAndEndRegions(region);
}
return cb->availableLogicalWidthForLineInRegion(logicalTopPosition, false, containingBlockRegion, availableLogicalHeight(IncludeMarginBorderPadding));
}
LayoutUnit RenderBox::perpendicularContainingBlockLogicalHeight() const
{
if (hasOverrideContainingBlockLogicalHeight())
return overrideContainingBlockContentLogicalHeight();
RenderBlock* cb = containingBlock();
if (cb->hasOverrideHeight())
return cb->overrideLogicalContentHeight();
RenderStyle* containingBlockStyle = cb->style();
Length logicalHeightLength = containingBlockStyle->logicalHeight();
// FIXME: For now just support fixed heights. Eventually should support percentage heights as well.
if (!logicalHeightLength.isFixed()) {
LayoutUnit fillFallbackExtent = containingBlockStyle->isHorizontalWritingMode() ? view()->frameView()->visibleHeight() : view()->frameView()->visibleWidth();
LayoutUnit fillAvailableExtent = containingBlock()->availableLogicalHeight(ExcludeMarginBorderPadding);
return min(fillAvailableExtent, fillFallbackExtent);
}
// Use the content box logical height as specified by the style.
return cb->adjustContentBoxLogicalHeightForBoxSizing(logicalHeightLength.value());
}
void RenderBox::mapLocalToContainer(const RenderLayerModelObject* repaintContainer, TransformState& transformState, MapCoordinatesFlags mode, bool* wasFixed) const
{
if (repaintContainer == this)
return;
if (RenderView* v = view()) {
if (v->layoutStateEnabled() && !repaintContainer) {
LayoutState* layoutState = v->layoutState();
LayoutSize offset = layoutState->m_paintOffset + locationOffset();
if (style()->hasInFlowPosition() && layer())
offset += layer()->offsetForInFlowPosition();
transformState.move(offset);
return;
}
}
bool containerSkipped;
RenderObject* o = container(repaintContainer, &containerSkipped);
if (!o)
return;
bool isFixedPos = style()->position() == FixedPosition;
bool hasTransform = hasLayer() && layer()->transform();
// If this box has a transform, it acts as a fixed position container for fixed descendants,
// and may itself also be fixed position. So propagate 'fixed' up only if this box is fixed position.
if (hasTransform && !isFixedPos)
mode &= ~IsFixed;
else if (isFixedPos)
mode |= IsFixed;
if (wasFixed)
*wasFixed = mode & IsFixed;
LayoutSize containerOffset = offsetFromContainer(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 repaintContainer and o, because transforms create containers, so it should be safe
// to just subtract the delta between the repaintContainer and o.
LayoutSize containerOffset = repaintContainer->offsetFromAncestorContainer(o);
transformState.move(-containerOffset.width(), -containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
return;
}
mode &= ~ApplyContainerFlip;
o->mapLocalToContainer(repaintContainer, transformState, mode, wasFixed);
}
void RenderBox::mapAbsoluteToLocalPoint(MapCoordinatesFlags mode, TransformState& transformState) const
{
// We don't expect to be called during layout.
ASSERT(!view() || !view()->layoutStateEnabled());
bool isFixedPos = style()->position() == FixedPosition;
bool hasTransform = hasLayer() && layer()->transform();
if (hasTransform && !isFixedPos) {
// If this box has a transform, it acts as a fixed position container for fixed descendants,
// and may itself also be fixed position. So propagate 'fixed' up only if this box is fixed position.
mode &= ~IsFixed;
} else if (isFixedPos)
mode |= IsFixed;
RenderBoxModelObject::mapAbsoluteToLocalPoint(mode, transformState);
}
LayoutSize RenderBox::offsetFromContainer(RenderObject* o, const LayoutPoint& point, bool* offsetDependsOnPoint) const
{
// A region "has" boxes inside it without being their container.
// FIXME: change container() / containingBlock() to count for boxes being positioned relative to the region, not the
// FlowThread. This requires a separate patch as a simple test with such a change in container() causes 129 out of
// 337 regions tests to fail.
ASSERT(o == container() || o->isRenderRegion());
LayoutSize offset;
if (isInFlowPositioned())
offset += offsetForInFlowPosition();
if (!isInline() || isReplaced()) {
if (!style()->hasOutOfFlowPosition() && o->hasColumns()) {
RenderBlock* block = toRenderBlock(o);
LayoutRect columnRect(frameRect());
block->adjustStartEdgeForWritingModeIncludingColumns(columnRect);
offset += toSize(columnRect.location());
LayoutPoint columnPoint = block->flipForWritingModeIncludingColumns(point + offset);
offset = toLayoutSize(block->flipForWritingModeIncludingColumns(toLayoutPoint(offset)));
o->adjustForColumns(offset, columnPoint);
offset = block->flipForWritingMode(offset);
if (offsetDependsOnPoint)
*offsetDependsOnPoint = true;
} else
offset += topLeftLocationOffset();
}
if (o->hasOverflowClip())
offset -= toRenderBox(o)->scrolledContentOffset();
if (style()->position() == AbsolutePosition && o->isInFlowPositioned() && o->isRenderInline())
offset += toRenderInline(o)->offsetForInFlowPositionedInline(this);
if (offsetDependsOnPoint)
*offsetDependsOnPoint |= o->isRenderFlowThread();
return offset;
}
InlineBox* RenderBox::createInlineBox()
{
return new InlineBox(this);
}
void RenderBox::dirtyLineBoxes(bool fullLayout)
{
if (m_inlineBoxWrapper) {
if (fullLayout) {
m_inlineBoxWrapper->destroy();
m_inlineBoxWrapper = 0;
} else
m_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, root->lineTopWithLeading(), LayoutUnit::fromFloatRound(box->logicalLeft()));
if (style()->hasStaticInlinePosition(box->isHorizontal()))
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(box->isHorizontal()))
setChildNeedsLayout(MarkOnlyThis); // Just go ahead and mark the positioned object as needing layout, so it will update its position properly.
}
// Nuke the box.
box->remove();
box->destroy();
} else if (isReplaced()) {
setLocation(roundedLayoutPoint(box->topLeft()));
setInlineBoxWrapper(box);
}
}
void RenderBox::deleteLineBoxWrapper()
{
if (m_inlineBoxWrapper) {
if (!documentBeingDestroyed())
m_inlineBoxWrapper->remove();
m_inlineBoxWrapper->destroy();
m_inlineBoxWrapper = 0;
}
}
LayoutRect RenderBox::clippedOverflowRectForRepaint(const RenderLayerModelObject* repaintContainer) const
{
if (style()->visibility() != VISIBLE && !enclosingLayer()->hasVisibleContent())
return LayoutRect();
LayoutRect r = visualOverflowRect();
RenderView* v = view();
if (v) {
// FIXME: layoutDelta needs to be applied in parts before/after transforms and
// repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
r.move(v->layoutDelta());
}
if (style()) {
// We have to use maximalOutlineSize() because a child might have an outline
// that projects outside of our overflowRect.
if (v) {
ASSERT(style()->outlineSize() <= v->maximalOutlineSize());
r.inflate(v->maximalOutlineSize());
}
}
computeRectForRepaint(repaintContainer, r);
return r;
}
void RenderBox::computeRectForRepaint(const RenderLayerModelObject* repaintContainer, LayoutRect& rect, bool fixed) const
{
// The rect we compute at each step is shifted by our x/y offset in the parent container's coordinate space.
// Only when we cross a writing mode boundary will we have to possibly flipForWritingMode (to convert into a more appropriate
// offset corner for the enclosing container). This allows for a fully RL or BT document to repaint
// properly even during layout, since the rect remains flipped all the way until the end.
//
// RenderView::computeRectForRepaint then converts the rect to physical coordinates. We also convert to
// physical when we hit a repaintContainer boundary. Therefore the final rect returned is always in the
// physical coordinate space of the repaintContainer.
RenderStyle* styleToUse = style();
if (RenderView* v = view()) {
// LayoutState is only valid for root-relative, non-fixed position repainting
if (v->layoutStateEnabled() && !repaintContainer && styleToUse->position() != FixedPosition) {
LayoutState* layoutState = v->layoutState();
if (layer() && layer()->transform())
rect = layer()->transform()->mapRect(pixelSnappedIntRect(rect));
// We can't trust the bits on RenderObject, because this might be called while re-resolving style.
if (styleToUse->hasInFlowPosition() && layer())
rect.move(layer()->offsetForInFlowPosition());
rect.moveBy(location());
rect.move(layoutState->m_paintOffset);
if (layoutState->m_clipped)
rect.intersect(layoutState->m_clipRect);
return;
}
}
if (hasReflection())
rect.unite(reflectedRect(rect));
if (repaintContainer == this) {
if (repaintContainer->style()->isFlippedBlocksWritingMode())
flipForWritingMode(rect);
return;
}
bool containerSkipped;
RenderObject* o = container(repaintContainer, &containerSkipped);
if (!o)
return;
if (isWritingModeRoot() && !isOutOfFlowPositioned())
flipForWritingMode(rect);
LayoutPoint topLeft = rect.location();
topLeft.move(locationOffset());
EPosition position = styleToUse->position();
// We are now in our parent container's coordinate space. Apply our transform to obtain a bounding box
// in the parent's coordinate space that encloses us.
if (hasLayer() && layer()->transform()) {
fixed = position == FixedPosition;
rect = layer()->transform()->mapRect(pixelSnappedIntRect(rect));
topLeft = rect.location();
topLeft.move(locationOffset());
} else if (position == FixedPosition)
fixed = true;
if (position == AbsolutePosition && o->isInFlowPositioned() && o->isRenderInline()) {
topLeft += toRenderInline(o)->offsetForInFlowPositionedInline(this);
} else if (styleToUse->hasInFlowPosition() && layer()) {
// Apply the relative position offset when invalidating a rectangle. The layer
// is translated, but the render box isn't, so we need to do this to get the
// right dirty rect. Since this is called from RenderObject::setStyle, the relative position
// flag on the RenderObject has been cleared, so use the one on the style().
topLeft += layer()->offsetForInFlowPosition();
}
if (position != AbsolutePosition && position != FixedPosition && o->hasColumns() && o->isRenderBlockFlow()) {
LayoutRect repaintRect(topLeft, rect.size());
toRenderBlock(o)->adjustRectForColumns(repaintRect);
topLeft = repaintRect.location();
rect = repaintRect;
}
// FIXME: We ignore the lightweight clipping rect that controls use, since if |o| is in mid-layout,
// its controlClipRect will be wrong. For overflow clip we use the values cached by the layer.
rect.setLocation(topLeft);
if (o->hasOverflowClip()) {
RenderBox* containerBox = toRenderBox(o);
containerBox->applyCachedClipAndScrollOffsetForRepaint(rect);
if (rect.isEmpty())
return;
}
if (containerSkipped) {
// If the repaintContainer is below o, then we need to map the rect into repaintContainer's coordinates.
LayoutSize containerOffset = repaintContainer->offsetFromAncestorContainer(o);
rect.move(-containerOffset);
return;
}
o->computeRectForRepaint(repaintContainer, rect, fixed);
}
void RenderBox::repaintDuringLayoutIfMoved(const LayoutRect& oldRect)
{
if (oldRect.location() != m_frameRect.location()) {
LayoutRect newRect = m_frameRect;
// The child moved. Invalidate the object's old and new positions. We have to do this
// since the object may not have gotten a layout.
m_frameRect = oldRect;
repaint();
repaintOverhangingFloats(true);
m_frameRect = newRect;
repaint();
repaintOverhangingFloats(true);
}
}
void RenderBox::repaintOverhangingFloats(bool)
{
}
void RenderBox::updateLogicalWidth()
{
LogicalExtentComputedValues computedValues;
computeLogicalWidthInRegion(computedValues);
setLogicalWidth(computedValues.m_extent);
setLogicalLeft(computedValues.m_position);
setMarginStart(computedValues.m_margins.m_start);
setMarginEnd(computedValues.m_margins.m_end);
}
static float getMaxWidthListMarker(const RenderBox* renderer)
{
#ifndef NDEBUG
ASSERT(renderer);
Node* parentNode = renderer->generatingNode();
ASSERT(parentNode);
ASSERT(parentNode->hasTagName(olTag) || parentNode->hasTagName(ulTag));
ASSERT(renderer->style()->textAutosizingMultiplier() != 1);
#endif
float maxWidth = 0;
for (RenderObject* child = renderer->firstChild(); child; child = child->nextSibling()) {
if (!child->isListItem())
continue;
RenderBox* listItem = toRenderBox(child);
for (RenderObject* itemChild = listItem->firstChild(); itemChild; itemChild = itemChild->nextSibling()) {
if (!itemChild->isListMarker())
continue;
RenderBox* itemMarker = toRenderBox(itemChild);
// FIXME: canDetermineWidthWithoutLayout expects us to use fixedOffsetWidth, which this code
// does not do! This check is likely wrong.
if (!itemMarker->canDetermineWidthWithoutLayout() && itemMarker->needsLayout()) {
// Make sure to compute the autosized width.
itemMarker->layout();
}
maxWidth = max<float>(maxWidth, toRenderListMarker(itemMarker)->logicalWidth().toFloat());
break;
}
}
return maxWidth;
}
void RenderBox::computeLogicalWidthInRegion(LogicalExtentComputedValues& computedValues, RenderRegion* region) const
{
computedValues.m_extent = logicalWidth();
computedValues.m_position = logicalLeft();
computedValues.m_margins.m_start = marginStart();
computedValues.m_margins.m_end = marginEnd();
if (isOutOfFlowPositioned()) {
// FIXME: This calculation is not patched for block-flow yet.
// https://bugs.webkit.org/show_bug.cgi?id=46500
computePositionedLogicalWidth(computedValues, region);
return;
}
// If layout is limited to a subtree, the subtree root's logical width does not change.
if (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() && (style()->borderFit() == BorderFitLines || parent()->isFlexibleBoxIncludingDeprecated())) {
computedValues.m_extent = overrideLogicalContentWidth() + borderAndPaddingLogicalWidth();
return;
}
// FIXME: Account for block-flow in flexible boxes.
// https://bugs.webkit.org/show_bug.cgi?id=46418
bool inVerticalBox = parent()->isDeprecatedFlexibleBox() && (parent()->style()->boxOrient() == VERTICAL);
bool stretching = (parent()->style()->boxAlign() == BSTRETCH);
bool treatAsReplaced = shouldComputeSizeAsReplaced() && (!inVerticalBox || !stretching);
RenderStyle* styleToUse = style();
Length logicalWidthLength = treatAsReplaced ? Length(computeReplacedLogicalWidth(), Fixed) : styleToUse->logicalWidth();
RenderBlock* cb = containingBlock();
LayoutUnit containerLogicalWidth = max<LayoutUnit>(0, containingBlockLogicalWidthForContentInRegion(region));
bool hasPerpendicularContainingBlock = cb->isHorizontalWritingMode() != isHorizontalWritingMode();
if (isInline() && !isInlineBlockOrInlineTable()) {
// just calculate margins
RenderView* renderView = view();
computedValues.m_margins.m_start = minimumValueForLength(styleToUse->marginStart(), containerLogicalWidth, renderView);
computedValues.m_margins.m_end = minimumValueForLength(styleToUse->marginEnd(), containerLogicalWidth, renderView);
if (treatAsReplaced)
computedValues.m_extent = max<LayoutUnit>(floatValueForLength(logicalWidthLength, 0, 0) + borderAndPaddingLogicalWidth(), minPreferredLogicalWidth());
return;
}
// Width calculations
if (treatAsReplaced)
computedValues.m_extent = logicalWidthLength.value() + borderAndPaddingLogicalWidth();
else {
LayoutUnit containerWidthInInlineDirection = containerLogicalWidth;
if (hasPerpendicularContainingBlock)
containerWidthInInlineDirection = perpendicularContainingBlockLogicalHeight();
LayoutUnit preferredWidth = computeLogicalWidthInRegionUsing(MainOrPreferredSize, styleToUse->logicalWidth(), containerWidthInInlineDirection, cb, region);
computedValues.m_extent = constrainLogicalWidthInRegionByMinMax(preferredWidth, containerWidthInInlineDirection, cb, region);
}
// Margin calculations.
if (hasPerpendicularContainingBlock || isFloating() || isInline()) {
RenderView* renderView = view();
computedValues.m_margins.m_start = minimumValueForLength(styleToUse->marginStart(), containerLogicalWidth, renderView);
computedValues.m_margins.m_end = minimumValueForLength(styleToUse->marginEnd(), containerLogicalWidth, renderView);
} else {
LayoutUnit containerLogicalWidthForAutoMargins = containerLogicalWidth;
if (avoidsFloats() && cb->containsFloats())
containerLogicalWidthForAutoMargins = containingBlockAvailableLineWidthInRegion(region);
bool hasInvertedDirection = cb->style()->isLeftToRightDirection() != style()->isLeftToRightDirection();
computeInlineDirectionMargins(cb, containerLogicalWidthForAutoMargins, computedValues.m_extent,
hasInvertedDirection ? computedValues.m_margins.m_end : computedValues.m_margins.m_start,
hasInvertedDirection ? computedValues.m_margins.m_start : computedValues.m_margins.m_end);
}
if (!hasPerpendicularContainingBlock && containerLogicalWidth && containerLogicalWidth != (computedValues.m_extent + computedValues.m_margins.m_start + computedValues.m_margins.m_end)
&& !isFloating() && !isInline() && !cb->isFlexibleBoxIncludingDeprecated() && !cb->isRenderGrid()) {
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;
}
if (styleToUse->textAutosizingMultiplier() != 1 && styleToUse->marginStart().type() == Fixed) {
Node* parentNode = generatingNode();
if (parentNode && (parentNode->hasTagName(olTag) || parentNode->hasTagName(ulTag))) {
// Make sure the markers in a list are properly positioned (i.e. not chopped off) when autosized.
const float adjustedMargin = (1 - 1.0 / styleToUse->textAutosizingMultiplier()) * getMaxWidthListMarker(this);
bool hasInvertedDirection = cb->style()->isLeftToRightDirection() != style()->isLeftToRightDirection();
if (hasInvertedDirection)
computedValues.m_margins.m_end += adjustedMargin;
else
computedValues.m_margins.m_start += adjustedMargin;
}
}
}
LayoutUnit RenderBox::fillAvailableMeasure(LayoutUnit availableLogicalWidth) const
{
LayoutUnit marginStart = 0;
LayoutUnit marginEnd = 0;
return fillAvailableMeasure(availableLogicalWidth, marginStart, marginEnd);
}
LayoutUnit RenderBox::fillAvailableMeasure(LayoutUnit availableLogicalWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const
{
RenderView* renderView = view();
marginStart = minimumValueForLength(style()->marginStart(), availableLogicalWidth, renderView);
marginEnd = minimumValueForLength(style()->marginEnd(), availableLogicalWidth, renderView);
return availableLogicalWidth - marginStart - marginEnd;
}
LayoutUnit RenderBox::computeIntrinsicLogicalWidthUsing(Length logicalWidthLength, LayoutUnit availableLogicalWidth, LayoutUnit borderAndPadding) const
{
if (logicalWidthLength.type() == FillAvailable)
return fillAvailableMeasure(availableLogicalWidth);
LayoutUnit minLogicalWidth = 0;
LayoutUnit maxLogicalWidth = 0;
computeIntrinsicLogicalWidths(minLogicalWidth, maxLogicalWidth);
if (logicalWidthLength.type() == MinContent)
return minLogicalWidth + borderAndPadding;
if (logicalWidthLength.type() == MaxContent)
return maxLogicalWidth + borderAndPadding;
if (logicalWidthLength.type() == FitContent) {
minLogicalWidth += borderAndPadding;
maxLogicalWidth += borderAndPadding;
return max(minLogicalWidth, min(maxLogicalWidth, fillAvailableMeasure(availableLogicalWidth)));
}
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit RenderBox::computeLogicalWidthInRegionUsing(SizeType widthType, Length logicalWidth, LayoutUnit availableLogicalWidth,
const RenderBlock* cb, RenderRegion* region) const
{
if (!logicalWidth.isIntrinsicOrAuto()) {
// FIXME: If the containing block flow is perpendicular to our direction we need to use the available logical height instead.
return adjustBorderBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, availableLogicalWidth, view()));
}
if (logicalWidth.isIntrinsic())
return computeIntrinsicLogicalWidthUsing(logicalWidth, availableLogicalWidth, borderAndPaddingLogicalWidth());
LayoutUnit marginStart = 0;
LayoutUnit marginEnd = 0;
LayoutUnit logicalWidthResult = fillAvailableMeasure(availableLogicalWidth, marginStart, marginEnd);
if (shrinkToAvoidFloats() && cb->containsFloats())
logicalWidthResult = min(logicalWidthResult, shrinkLogicalWidthToAvoidFloats(marginStart, marginEnd, toRenderBlockFlow(cb), region));
if (widthType == MainOrPreferredSize && sizesLogicalWidthToFitContent(widthType))
return max(minPreferredLogicalWidth(), 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() == AlignStretch || (flexitem->style()->alignSelf() == AlignAuto && parent->style()->alignItems() == AlignStretch);
}
static bool isStretchingColumnFlexItem(const RenderObject* flexitem)
{
RenderObject* parent = flexitem->parent();
if (parent->isDeprecatedFlexibleBox() && parent->style()->boxOrient() == VERTICAL && parent->style()->boxAlign() == BSTRETCH)
return true;
// We don't stretch multiline flexboxes because they need to apply line spacing (align-content) first.
if (parent->isFlexibleBox() && parent->style()->flexWrap() == FlexNoWrap && parent->style()->isColumnFlexDirection() && columnFlexItemHasStretchAlignment(flexitem))
return true;
return false;
}
bool RenderBox::sizesLogicalWidthToFitContent(SizeType widthType) const
{
// Marquees in WinIE are like a mixture of blocks and inline-blocks. They size as though they're blocks,
// but they allow text to sit on the same line as the marquee.
if (isFloating() || (isInlineBlockOrInlineTable() && !isMarquee()))
return true;
// This code may look a bit strange. Basically width:intrinsic should clamp the size when testing both
// min-width and width. max-width is only clamped if it is also intrinsic.
Length logicalWidth = (widthType == MaxSize) ? style()->logicalMaxWidth() : style()->logicalWidth();
if (logicalWidth.type() == Intrinsic)
return true;
// Children of a horizontal marquee do not fill the container by default.
// FIXME: Need to deal with MAUTO value properly. It could be vertical.
// FIXME: Think about block-flow here. Need to find out how marquee direction relates to
// block-flow (as well as how marquee overflow should relate to block flow).
// https://bugs.webkit.org/show_bug.cgi?id=46472
if (parent()->isMarquee()) {
EMarqueeDirection dir = parent()->style()->marqueeDirection();
if (dir == MAUTO || dir == MFORWARD || dir == MBACKWARD || dir == MLEFT || dir == MRIGHT)
return true;
}
// Flexible box items should shrink wrap, so we lay them out at their intrinsic widths.
// In the case of columns that have a stretch alignment, we 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;
}
// Flexible horizontal boxes lay out children at their intrinsic widths. Also vertical boxes
// that don't stretch their kids lay out their children at their intrinsic widths.
// FIXME: Think about block-flow here.
// https://bugs.webkit.org/show_bug.cgi?id=46473
if (parent()->isDeprecatedFlexibleBox() && (parent()->style()->boxOrient() == HORIZONTAL || parent()->style()->boxAlign() != BSTRETCH))
return true;
// Button, input, select, textarea, and legend treat width value of 'auto' as 'intrinsic' unless it's in a
// stretching column flexbox.
// FIXME: Think about block-flow here.
// https://bugs.webkit.org/show_bug.cgi?id=46473
if (logicalWidth.type() == Auto && !isStretchingColumnFlexItem(this) && autoWidthShouldFitContent())
return true;
if (isHorizontalWritingMode() != containingBlock()->isHorizontalWritingMode())
return true;
return false;
}
bool RenderBox::autoWidthShouldFitContent() const
{
if (node() && (node()->hasTagName(inputTag) || node()->hasTagName(selectTag) || node()->hasTagName(buttonTag)
|| isHTMLTextAreaElement(node()) || node()->hasTagName(legendTag)))
return true;
return false;
}
void RenderBox::computeInlineDirectionMargins(RenderBlock* containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd) const
{
const RenderStyle* containingBlockStyle = containingBlock->style();
Length marginStartLength = style()->marginStartUsing(containingBlockStyle);
Length marginEndLength = style()->marginEndUsing(containingBlockStyle);
RenderView* renderView = view();
if (isFloating() || isInline()) {
// Inline blocks/tables and floats don't have their margins increased.
marginStart = minimumValueForLength(marginStartLength, containerWidth, renderView);
marginEnd = minimumValueForLength(marginEndLength, containerWidth, renderView);
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);
}
// Case One: The object is being centered in the containing block's available logical width.
if ((marginStartLength.isAuto() && marginEndLength.isAuto() && childWidth < containerWidth)
|| (!marginStartLength.isAuto() && !marginEndLength.isAuto() && containingBlock->style()->textAlign() == WEBKIT_CENTER)) {
// Other browsers center the margin box for align=center elements so we match them here.
LayoutUnit marginStartWidth = minimumValueForLength(marginStartLength, containerWidth, renderView);
LayoutUnit marginEndWidth = minimumValueForLength(marginEndLength, containerWidth, renderView);
LayoutUnit centeredMarginBoxStart = max<LayoutUnit>(0, (containerWidth - childWidth - marginStartWidth - marginEndWidth) / 2);
marginStart = centeredMarginBoxStart + marginStartWidth;
marginEnd = containerWidth - childWidth - marginStart + marginEndWidth;
return;
}
// Case Two: The object is being pushed to the start of the containing block's available logical width.
if (marginEndLength.isAuto() && childWidth < containerWidth) {
marginStart = valueForLength(marginStartLength, containerWidth, renderView);
marginEnd = containerWidth - childWidth - marginStart;
return;
}
// Case Three: The object is being pushed to the end of the containing block's available logical width.
bool pushToEndFromTextAlign = !marginEndLength.isAuto() && ((!containingBlockStyle->isLeftToRightDirection() && containingBlockStyle->textAlign() == WEBKIT_LEFT)
|| (containingBlockStyle->isLeftToRightDirection() && containingBlockStyle->textAlign() == WEBKIT_RIGHT));
if ((marginStartLength.isAuto() && childWidth < containerWidth) || pushToEndFromTextAlign) {
marginEnd = valueForLength(marginEndLength, containerWidth, renderView);
marginStart = containerWidth - childWidth - marginEnd;
return;
}
// Case Four: Either no auto margins, or our width is >= the container width (css2.1, 10.3.3). In that case
// auto margins will just turn into 0.
marginStart = minimumValueForLength(marginStartLength, containerWidth, renderView);
marginEnd = minimumValueForLength(marginEndLength, containerWidth, renderView);
}
RenderBoxRegionInfo* RenderBox::renderBoxRegionInfo(RenderRegion* region, RenderBoxRegionInfoFlags cacheFlag) const
{
// Make sure nobody is trying to call this with a null region.
if (!region)
return 0;
// If we have computed our width in this region already, it will be cached, and we can
// just return it.
RenderBoxRegionInfo* boxInfo = region->renderBoxRegionInfo(this);
if (boxInfo && cacheFlag == CacheRenderBoxRegionInfo)
return boxInfo;
// No cached value was found, so we have to compute our insets in this region.
// FIXME: For now we limit this computation to normal RenderBlocks. Future patches will expand
// support to cover all boxes.
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (isRenderFlowThread() || !flowThread || !canHaveBoxInfoInRegion() || flowThread->style()->writingMode() != style()->writingMode())
return 0;
LogicalExtentComputedValues computedValues;
computeLogicalWidthInRegion(computedValues, region);
// Now determine the insets based off where this object is supposed to be positioned.
RenderBlock* cb = containingBlock();
RenderRegion* clampedContainingBlockRegion = cb->clampToStartAndEndRegions(region);
RenderBoxRegionInfo* containingBlockInfo = cb->renderBoxRegionInfo(clampedContainingBlockRegion);
LayoutUnit containingBlockLogicalWidth = cb->logicalWidth();
LayoutUnit containingBlockLogicalWidthInRegion = containingBlockInfo ? containingBlockInfo->logicalWidth() : containingBlockLogicalWidth;
LayoutUnit marginStartInRegion = computedValues.m_margins.m_start;
LayoutUnit startMarginDelta = marginStartInRegion - marginStart();
LayoutUnit logicalWidthInRegion = computedValues.m_extent;
LayoutUnit logicalLeftInRegion = computedValues.m_position;
LayoutUnit widthDelta = logicalWidthInRegion - logicalWidth();
LayoutUnit logicalLeftDelta = isOutOfFlowPositioned() ? logicalLeftInRegion - logicalLeft() : startMarginDelta;
LayoutUnit logicalRightInRegion = containingBlockLogicalWidthInRegion - (logicalLeftInRegion + logicalWidthInRegion);
LayoutUnit oldLogicalRight = containingBlockLogicalWidth - (logicalLeft() + logicalWidth());
LayoutUnit logicalRightDelta = isOutOfFlowPositioned() ? logicalRightInRegion - oldLogicalRight : startMarginDelta;
LayoutUnit logicalLeftOffset = 0;
if (!isOutOfFlowPositioned() && avoidsFloats() && cb->containsFloats()) {
LayoutUnit startPositionDelta = cb->computeStartPositionDeltaForChildAvoidingFloats(this, marginStartInRegion, region);
if (cb->style()->isLeftToRightDirection())
logicalLeftDelta += startPositionDelta;
else
logicalRightDelta += startPositionDelta;
}
if (cb->style()->isLeftToRightDirection())
logicalLeftOffset += logicalLeftDelta;
else
logicalLeftOffset -= (widthDelta + logicalRightDelta);
LayoutUnit logicalRightOffset = logicalWidth() - (logicalLeftOffset + logicalWidthInRegion);
bool isShifted = (containingBlockInfo && containingBlockInfo->isShifted())
|| (style()->isLeftToRightDirection() && logicalLeftOffset)
|| (!style()->isLeftToRightDirection() && logicalRightOffset);
// FIXME: Although it's unlikely, these boxes can go outside our bounds, and so we will need to incorporate them into overflow.
if (cacheFlag == CacheRenderBoxRegionInfo)
return region->setRenderBoxRegionInfo(this, logicalLeftOffset, logicalWidthInRegion, isShifted);
return new RenderBoxRegionInfo(logicalLeftOffset, logicalWidthInRegion, isShifted);
}
static bool shouldFlipBeforeAfterMargins(const RenderStyle* containingBlockStyle, const RenderStyle* childStyle)
{
ASSERT(containingBlockStyle->isHorizontalWritingMode() != childStyle->isHorizontalWritingMode());
WritingMode childWritingMode = childStyle->writingMode();
bool shouldFlip = false;
switch (containingBlockStyle->writingMode()) {
case TopToBottomWritingMode:
shouldFlip = (childWritingMode == RightToLeftWritingMode);
break;
case BottomToTopWritingMode:
shouldFlip = (childWritingMode == RightToLeftWritingMode);
break;
case RightToLeftWritingMode:
shouldFlip = (childWritingMode == BottomToTopWritingMode);
break;
case LeftToRightWritingMode:
shouldFlip = (childWritingMode == BottomToTopWritingMode);
break;
}
if (!containingBlockStyle->isLeftToRightDirection())
shouldFlip = !shouldFlip;
return shouldFlip;
}
void RenderBox::updateLogicalHeight()
{
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 (isTableCell() || (isInline() && !isReplaced()))
return;
Length h;
if (isOutOfFlowPositioned())
computePositionedLogicalHeight(computedValues);
else {
RenderBlock* cb = containingBlock();
bool hasPerpendicularContainingBlock = cb->isHorizontalWritingMode() != isHorizontalWritingMode();
if (!hasPerpendicularContainingBlock) {
bool shouldFlipBeforeAfter = cb->style()->writingMode() != style()->writingMode();
computeBlockDirectionMargins(cb,
shouldFlipBeforeAfter ? computedValues.m_margins.m_after : computedValues.m_margins.m_before,
shouldFlipBeforeAfter ? computedValues.m_margins.m_before : computedValues.m_margins.m_after);
}
// For tables, calculate margins only.
if (isTable()) {
if (hasPerpendicularContainingBlock) {
bool shouldFlipBeforeAfter = shouldFlipBeforeAfterMargins(cb->style(), style());
computeInlineDirectionMargins(cb, containingBlockLogicalWidthForContent(), computedValues.m_extent,
shouldFlipBeforeAfter ? computedValues.m_margins.m_after : computedValues.m_margins.m_before,
shouldFlipBeforeAfter ? computedValues.m_margins.m_before : computedValues.m_margins.m_after);