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RenderBox.cpp
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RenderBox.cpp
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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
* (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2005-2010, 2015 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "RenderBox.h"
#include "CSSFontSelector.h"
#include "ControlStates.h"
#include "Document.h"
#include "EventHandler.h"
#include "FloatQuad.h"
#include "FloatRoundedRect.h"
#include "Frame.h"
#include "FrameView.h"
#include "GraphicsContext.h"
#include "HTMLBodyElement.h"
#include "HTMLButtonElement.h"
#include "HTMLFrameOwnerElement.h"
#include "HTMLHtmlElement.h"
#include "HTMLInputElement.h"
#include "HTMLLegendElement.h"
#include "HTMLNames.h"
#include "HTMLSelectElement.h"
#include "HTMLTextAreaElement.h"
#include "HitTestResult.h"
#include "InlineElementBox.h"
#include "MainFrame.h"
#include "Page.h"
#include "PaintInfo.h"
#include "RenderBoxRegionInfo.h"
#include "RenderChildIterator.h"
#include "RenderDeprecatedFlexibleBox.h"
#include "RenderFlexibleBox.h"
#include "RenderGeometryMap.h"
#include "RenderInline.h"
#include "RenderIterator.h"
#include "RenderLayer.h"
#include "RenderLayerCompositor.h"
#include "RenderNamedFlowFragment.h"
#include "RenderNamedFlowThread.h"
#include "RenderTableCell.h"
#include "RenderTheme.h"
#include "RenderView.h"
#include "ScrollAnimator.h"
#include "ScrollbarTheme.h"
#include "StyleScrollSnapPoints.h"
#include "TransformState.h"
#include "htmlediting.h"
#include <algorithm>
#include <math.h>
#include <wtf/StackStats.h>
#include "RenderGrid.h"
#if PLATFORM(IOS)
#include "Settings.h"
#endif
namespace WebCore {
struct SameSizeAsRenderBox : public RenderBoxModelObject {
virtual ~SameSizeAsRenderBox() { }
LayoutRect frameRect;
LayoutBoxExtent marginBox;
LayoutUnit preferredLogicalWidths[2];
void* pointers[2];
};
COMPILE_ASSERT(sizeof(RenderBox) == sizeof(SameSizeAsRenderBox), RenderBox_should_stay_small);
using namespace HTMLNames;
// Used by flexible boxes when flexing this element and by table cells.
typedef WTF::HashMap<const RenderBox*, LayoutUnit> OverrideSizeMap;
static OverrideSizeMap* gOverrideHeightMap = nullptr;
static OverrideSizeMap* gOverrideWidthMap = nullptr;
// Used by grid elements to properly size their grid items.
typedef WTF::HashMap<const RenderBox*, std::optional<LayoutUnit>> OverrideOptionalSizeMap;
static OverrideOptionalSizeMap* gOverrideContainingBlockLogicalHeightMap = nullptr;
static OverrideOptionalSizeMap* gOverrideContainingBlockLogicalWidthMap = nullptr;
static OverrideSizeMap* gExtraInlineOffsetMap = nullptr;
static OverrideSizeMap* gExtraBlockOffsetMap = nullptr;
// 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;
using ControlStatesRendererMap = HashMap<const RenderObject*, std::unique_ptr<ControlStates>>;
static ControlStatesRendererMap& controlStatesRendererMap()
{
static NeverDestroyed<ControlStatesRendererMap> map;
return map;
}
static ControlStates* controlStatesForRenderer(const RenderBox& renderer)
{
return controlStatesRendererMap().ensure(&renderer, [] {
return std::make_unique<ControlStates>();
}).iterator->value.get();
}
static void removeControlStatesForRenderer(const RenderBox& renderer)
{
controlStatesRendererMap().remove(&renderer);
}
bool RenderBox::s_hadOverflowClip = false;
RenderBox::RenderBox(Element& element, RenderStyle&& style, BaseTypeFlags baseTypeFlags)
: RenderBoxModelObject(element, WTFMove(style), baseTypeFlags)
{
setIsBox();
}
RenderBox::RenderBox(Document& document, RenderStyle&& style, BaseTypeFlags baseTypeFlags)
: RenderBoxModelObject(document, WTFMove(style), baseTypeFlags)
{
setIsBox();
}
RenderBox::~RenderBox()
{
if (frame().eventHandler().autoscrollRenderer() == this)
frame().eventHandler().stopAutoscrollTimer(true);
clearOverrideSize();
clearContainingBlockOverrideSize();
clearExtraInlineAndBlockOffests();
RenderBlock::removePercentHeightDescendantIfNeeded(*this);
ShapeOutsideInfo::removeInfo(*this);
view().unscheduleLazyRepaint(*this);
removeControlStatesForRenderer(*this);
}
RenderRegion* RenderBox::clampToStartAndEndRegions(RenderRegion* region) const
{
RenderFlowThread* flowThread = flowThreadContainingBlock();
ASSERT(isRenderView() || (region && flowThread));
if (isRenderView())
return region;
// We need to clamp to the block, since we want any lines or blocks that overflow out of the
// logical top or logical bottom of the block to size as though the border box in the first and
// last regions extended infinitely. Otherwise the lines are going to size according to the regions
// they overflow into, which makes no sense when this block doesn't exist in |region| at all.
RenderRegion* startRegion = nullptr;
RenderRegion* endRegion = nullptr;
if (!flowThread->getRegionRangeForBox(this, startRegion, endRegion))
return region;
if (region->logicalTopForFlowThreadContent() < startRegion->logicalTopForFlowThreadContent())
return startRegion;
if (region->logicalTopForFlowThreadContent() > endRegion->logicalTopForFlowThreadContent())
return endRegion;
return region;
}
bool RenderBox::hasRegionRangeInFlowThread() const
{
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!flowThread || !flowThread->hasValidRegionInfo())
return false;
return flowThread->hasCachedRegionRangeForBox(*this);
}
LayoutRect RenderBox::clientBoxRectInRegion(RenderRegion* region) const
{
if (!region)
return clientBoxRect();
LayoutRect clientBox = borderBoxRectInRegion(region);
clientBox.setLocation(clientBox.location() + LayoutSize(borderLeft(), borderTop()));
clientBox.setSize(clientBox.size() - LayoutSize(borderLeft() + borderRight() + verticalScrollbarWidth(), borderTop() + borderBottom() + horizontalScrollbarHeight()));
return clientBox;
}
LayoutRect RenderBox::borderBoxRectInRegion(RenderRegion* region, RenderBoxRegionInfoFlags cacheFlag) const
{
if (!region)
return borderBoxRect();
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (!flowThread)
return borderBoxRect();
RenderRegion* startRegion = nullptr;
RenderRegion* endRegion = nullptr;
if (!flowThread->getRegionRangeForBox(this, startRegion, endRegion)) {
// FIXME: In a perfect world this condition should never happen.
return borderBoxRect();
}
ASSERT(flowThread->regionInRange(region, startRegion, endRegion));
// Compute the logical width and placement in this region.
RenderBoxRegionInfo* boxInfo = renderBoxRegionInfo(region, cacheFlag);
if (!boxInfo)
return borderBoxRect();
// We have cached insets.
LayoutUnit logicalWidth = boxInfo->logicalWidth();
LayoutUnit logicalLeft = boxInfo->logicalLeft();
// Now apply the parent inset since it is cumulative whenever anything in the containing block chain shifts.
// FIXME: Doesn't work right with perpendicular writing modes.
const RenderBlock* currentBox = containingBlock();
RenderBoxRegionInfo* currentBoxInfo = isRenderFlowThread() ? nullptr : currentBox->renderBoxRegionInfo(region);
while (currentBoxInfo && currentBoxInfo->isShifted()) {
if (currentBox->style().direction() == LTR)
logicalLeft += currentBoxInfo->logicalLeft();
else
logicalLeft -= (currentBox->logicalWidth() - currentBoxInfo->logicalWidth()) - currentBoxInfo->logicalLeft();
// Once we reach the fragmentation container we should stop.
if (currentBox->isRenderFlowThread())
break;
currentBox = currentBox->containingBlock();
if (!currentBox)
break;
region = currentBox->clampToStartAndEndRegions(region);
currentBoxInfo = currentBox->renderBoxRegionInfo(region);
}
if (cacheFlag == DoNotCacheRenderBoxRegionInfo)
delete boxInfo;
if (isHorizontalWritingMode())
return LayoutRect(logicalLeft, 0, logicalWidth, height());
return LayoutRect(0, logicalLeft, width(), logicalWidth);
}
static RenderBlockFlow* outermostBlockContainingFloatingObject(RenderBox& box)
{
ASSERT(box.isFloating());
RenderBlockFlow* parentBlock = nullptr;
for (auto& ancestor : ancestorsOfType<RenderBlockFlow>(box)) {
if (ancestor.isRenderView())
break;
if (!parentBlock || ancestor.containsFloat(box))
parentBlock = &ancestor;
}
return parentBlock;
}
void RenderBox::removeFloatingOrPositionedChildFromBlockLists()
{
ASSERT(isFloatingOrOutOfFlowPositioned());
if (documentBeingDestroyed())
return;
if (isFloating()) {
if (RenderBlockFlow* parentBlock = outermostBlockContainingFloatingObject(*this)) {
parentBlock->markSiblingsWithFloatsForLayout(this);
parentBlock->markAllDescendantsWithFloatsForLayout(this, false);
}
}
if (isOutOfFlowPositioned())
RenderBlock::removePositionedObject(*this);
}
void RenderBox::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
{
s_hadOverflowClip = hasOverflowClip();
const RenderStyle* oldStyle = hasInitializedStyle() ? &style() : nullptr;
if (oldStyle) {
// The background of the root element or the body element could propagate up to
// the canvas. Issue full repaint, when our style changes substantially.
if (diff >= StyleDifferenceRepaint && (isDocumentElementRenderer() || isBody())) {
view().repaintRootContents();
if (oldStyle->hasEntirelyFixedBackground() != newStyle.hasEntirelyFixedBackground())
view().compositor().rootFixedBackgroundsChanged();
}
// When a layout hint happens and an object's position style changes, we have to do a layout
// to dirty the render tree using the old position value now.
if (diff == StyleDifferenceLayout && parent() && oldStyle->position() != newStyle.position()) {
markContainingBlocksForLayout();
if (oldStyle->position() == StaticPosition)
repaint();
else if (newStyle.hasOutOfFlowPosition())
parent()->setChildNeedsLayout();
if (isFloating() && !isOutOfFlowPositioned() && newStyle.hasOutOfFlowPosition())
removeFloatingOrPositionedChildFromBlockLists();
}
} else if (isBody())
view().repaintRootContents();
#if ENABLE(CSS_SCROLL_SNAP)
bool boxContributesSnapPositions = newStyle.scrollSnapArea().hasSnapPosition();
if (boxContributesSnapPositions || (oldStyle && oldStyle->scrollSnapArea().hasSnapPosition())) {
if (boxContributesSnapPositions)
view().registerBoxWithScrollSnapPositions(*this);
else
view().unregisterBoxWithScrollSnapPositions(*this);
}
#endif
RenderBoxModelObject::styleWillChange(diff, newStyle);
}
void RenderBox::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
// Horizontal writing mode definition is updated in RenderBoxModelObject::updateFromStyle,
// (as part of the RenderBoxModelObject::styleDidChange call below). So, we can safely cache the horizontal
// writing mode value before style change here.
bool oldHorizontalWritingMode = isHorizontalWritingMode();
RenderBoxModelObject::styleDidChange(diff, oldStyle);
const RenderStyle& newStyle = style();
if (needsLayout() && oldStyle) {
RenderBlock::removePercentHeightDescendantIfNeeded(*this);
// Normally we can do optimized positioning layout for absolute/fixed positioned objects. There is one special case, however, which is
// when the positioned object's margin-before is changed. In this case the parent has to get a layout in order to run margin collapsing
// to determine the new static position.
if (isOutOfFlowPositioned() && newStyle.hasStaticBlockPosition(isHorizontalWritingMode()) && oldStyle->marginBefore() != newStyle.marginBefore()
&& parent() && !parent()->normalChildNeedsLayout())
parent()->setChildNeedsLayout();
}
if (RenderBlock::hasPercentHeightContainerMap() && firstChild()
&& oldHorizontalWritingMode != isHorizontalWritingMode())
RenderBlock::clearPercentHeightDescendantsFrom(*this);
// If our zoom factor changes and we have a defined scrollLeft/Top, we need to adjust that value into the
// new zoomed coordinate space.
if (hasOverflowClip() && layer() && oldStyle && oldStyle->effectiveZoom() != newStyle.effectiveZoom()) {
if (int left = layer()->scrollOffset().x()) {
left = (left / oldStyle->effectiveZoom()) * newStyle.effectiveZoom();
layer()->scrollToXOffset(left);
}
if (int top = layer()->scrollOffset().y()) {
top = (top / oldStyle->effectiveZoom()) * newStyle.effectiveZoom();
layer()->scrollToYOffset(top);
}
}
// Our opaqueness might have changed without triggering layout.
if (diff >= StyleDifferenceRepaint && diff <= StyleDifferenceRepaintLayer) {
auto parentToInvalidate = parent();
for (unsigned i = 0; i < backgroundObscurationTestMaxDepth && parentToInvalidate; ++i) {
parentToInvalidate->invalidateBackgroundObscurationStatus();
parentToInvalidate = parentToInvalidate->parent();
}
}
bool isBodyRenderer = isBody();
bool isDocElementRenderer = isDocumentElementRenderer();
if (isDocElementRenderer || isBodyRenderer) {
// Propagate the new writing mode and direction up to the RenderView.
auto* documentElementRenderer = document().documentElement()->renderer();
auto& viewStyle = view().mutableStyle();
bool rootStyleChanged = false;
bool viewDirectionOrWritingModeChanged = false;
auto* rootRenderer = isBodyRenderer ? documentElementRenderer : nullptr;
if (viewStyle.direction() != newStyle.direction() && (isDocElementRenderer || !documentElementRenderer->style().hasExplicitlySetDirection())) {
viewStyle.setDirection(newStyle.direction());
viewDirectionOrWritingModeChanged = true;
if (isBodyRenderer) {
rootRenderer->mutableStyle().setDirection(newStyle.direction());
rootStyleChanged = true;
}
setNeedsLayoutAndPrefWidthsRecalc();
view().frameView().topContentDirectionDidChange();
}
if (viewStyle.writingMode() != newStyle.writingMode() && (isDocElementRenderer || !documentElementRenderer->style().hasExplicitlySetWritingMode())) {
viewStyle.setWritingMode(newStyle.writingMode());
viewDirectionOrWritingModeChanged = true;
view().setHorizontalWritingMode(newStyle.isHorizontalWritingMode());
view().markAllDescendantsWithFloatsForLayout();
if (isBodyRenderer) {
rootStyleChanged = true;
rootRenderer->mutableStyle().setWritingMode(newStyle.writingMode());
rootRenderer->setHorizontalWritingMode(newStyle.isHorizontalWritingMode());
}
setNeedsLayoutAndPrefWidthsRecalc();
}
view().frameView().recalculateScrollbarOverlayStyle();
const Pagination& pagination = view().frameView().pagination();
if (viewDirectionOrWritingModeChanged && pagination.mode != Pagination::Unpaginated) {
viewStyle.setColumnStylesFromPaginationMode(pagination.mode);
if (view().multiColumnFlowThread())
view().updateColumnProgressionFromStyle(viewStyle);
}
if (viewDirectionOrWritingModeChanged && view().multiColumnFlowThread())
view().updateStylesForColumnChildren();
if (rootStyleChanged && is<RenderBlockFlow>(rootRenderer) && downcast<RenderBlockFlow>(*rootRenderer).multiColumnFlowThread())
downcast<RenderBlockFlow>(*rootRenderer).updateStylesForColumnChildren();
if (isBodyRenderer && pagination.mode != Pagination::Unpaginated && page().paginationLineGridEnabled()) {
// Propagate the body font back up to the RenderView and use it as
// the basis of the grid.
if (newStyle.fontDescription() != view().style().fontDescription()) {
view().mutableStyle().setFontDescription(newStyle.fontDescription());
view().mutableStyle().fontCascade().update(&document().fontSelector());
}
}
if (diff != StyleDifferenceEqual)
view().compositor().rootOrBodyStyleChanged(*this, oldStyle);
}
if ((oldStyle && oldStyle->shapeOutside()) || style().shapeOutside())
updateShapeOutsideInfoAfterStyleChange(style(), oldStyle);
updateGridPositionAfterStyleChange(style(), oldStyle);
}
void RenderBox::willBeRemovedFromTree()
{
#if ENABLE(CSS_SCROLL_SNAP)
if (hasInitializedStyle() && style().scrollSnapArea().hasSnapPosition())
view().unregisterBoxWithScrollSnapPositions(*this);
#endif
RenderBoxModelObject::willBeRemovedFromTree();
}
void RenderBox::updateGridPositionAfterStyleChange(const RenderStyle& style, const RenderStyle* oldStyle)
{
if (!oldStyle || !is<RenderGrid>(parent()))
return;
if (oldStyle->gridItemColumnStart() == style.gridItemColumnStart()
&& oldStyle->gridItemColumnEnd() == style.gridItemColumnEnd()
&& oldStyle->gridItemRowStart() == style.gridItemRowStart()
&& oldStyle->gridItemRowEnd() == style.gridItemRowEnd()
&& oldStyle->order() == style.order()
&& oldStyle->hasOutOfFlowPosition() == style.hasOutOfFlowPosition())
return;
// Positioned items don't participate on the layout of the grid,
// so we don't need to mark the grid as dirty if they change positions.
if (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.
downcast<RenderGrid>(*parent()).dirtyGrid();
}
void RenderBox::updateShapeOutsideInfoAfterStyleChange(const RenderStyle& style, const RenderStyle* oldStyle)
{
const ShapeValue* shapeOutside = style.shapeOutside();
const ShapeValue* oldShapeOutside = oldStyle ? oldStyle->shapeOutside() : nullptr;
Length shapeMargin = style.shapeMargin();
Length oldShapeMargin = oldStyle ? oldStyle->shapeMargin() : RenderStyle::initialShapeMargin();
float shapeImageThreshold = style.shapeImageThreshold();
float oldShapeImageThreshold = oldStyle ? oldStyle->shapeImageThreshold() : RenderStyle::initialShapeImageThreshold();
// FIXME: A future optimization would do a deep comparison for equality. (bug 100811)
if (shapeOutside == oldShapeOutside && shapeMargin == oldShapeMargin && shapeImageThreshold == oldShapeImageThreshold)
return;
if (!shapeOutside)
ShapeOutsideInfo::removeInfo(*this);
else
ShapeOutsideInfo::ensureInfo(*this).markShapeAsDirty();
if (shapeOutside || shapeOutside != oldShapeOutside)
markShapeOutsideDependentsForLayout();
}
void RenderBox::updateFromStyle()
{
RenderBoxModelObject::updateFromStyle();
const RenderStyle& styleToUse = style();
bool isDocElementRenderer = isDocumentElementRenderer();
bool isViewObject = isRenderView();
// The root and the RenderView always paint their backgrounds/borders.
if (isDocElementRenderer || isViewObject)
setHasVisibleBoxDecorations(true);
setFloating(!isOutOfFlowPositioned() && styleToUse.isFloating());
// We also handle <body> and <html>, whose overflow applies to the viewport.
if (styleToUse.overflowX() != OVISIBLE && !isDocElementRenderer && isRenderBlock()) {
bool boxHasOverflowClip = true;
if (isBody()) {
// Overflow on the body can propagate to the viewport under the following conditions.
// (1) The root element is <html>.
// (2) We are the primary <body> (can be checked by looking at document.body).
// (3) The root element has visible overflow.
if (is<HTMLHtmlElement>(*document().documentElement())
&& document().body() == element()
&& document().documentElement()->renderer()->style().overflowX() == OVISIBLE) {
boxHasOverflowClip = false;
}
}
// Check for overflow clip.
// It's sufficient to just check one direction, since it's illegal to have visible on only one overflow value.
if (boxHasOverflowClip) {
if (!s_hadOverflowClip && hasRenderOverflow()) {
// Erase the overflow.
// Overflow changes have to result in immediate repaints of the entire layout overflow area because
// repaints issued by removal of descendants get clipped using the updated style when they shouldn't.
repaintRectangle(visualOverflowRect());
repaintRectangle(layoutOverflowRect());
}
setHasOverflowClip();
}
}
setHasTransformRelatedProperty(styleToUse.hasTransformRelatedProperty());
setHasReflection(styleToUse.boxReflect());
}
void RenderBox::layout()
{
StackStats::LayoutCheckPoint layoutCheckPoint;
ASSERT(needsLayout());
RenderObject* child = firstChild();
if (!child) {
clearNeedsLayout();
return;
}
LayoutStateMaintainer statePusher(view(), *this, locationOffset(), style().isFlippedBlocksWritingMode());
while (child) {
if (child->needsLayout())
downcast<RenderElement>(*child).layout();
ASSERT(!child->needsLayout());
child = child->nextSibling();
}
statePusher.pop();
invalidateBackgroundObscurationStatus();
clearNeedsLayout();
}
// More IE extensions. clientWidth and clientHeight represent the interior of an object
// excluding border and scrollbar.
LayoutUnit RenderBox::clientWidth() const
{
return width() - borderLeft() - borderRight() - verticalScrollbarWidth();
}
LayoutUnit RenderBox::clientHeight() const
{
return height() - borderTop() - borderBottom() - horizontalScrollbarHeight();
}
int RenderBox::scrollWidth() const
{
if (hasOverflowClip() && layer())
return layer()->scrollWidth();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
if (style().isLeftToRightDirection()) {
// FIXME: This should use snappedIntSize() instead with absolute coordinates.
return roundToInt(std::max(clientWidth(), layoutOverflowRect().maxX() - borderLeft()));
}
return roundToInt(clientWidth() - std::min<LayoutUnit>(0, layoutOverflowRect().x() - borderLeft()));
}
int RenderBox::scrollHeight() const
{
if (hasOverflowClip() && layer())
return layer()->scrollHeight();
// For objects with visible overflow, this matches IE.
// FIXME: Need to work right with writing modes.
// FIXME: This should use snappedIntSize() instead with absolute coordinates.
return roundToInt(std::max(clientHeight(), layoutOverflowRect().maxY() - borderTop()));
}
int RenderBox::scrollLeft() const
{
return hasOverflowClip() && layer() ? layer()->scrollPosition().x() : 0;
}
int RenderBox::scrollTop() const
{
return hasOverflowClip() && layer() ? layer()->scrollPosition().y() : 0;
}
static void setupWheelEventTestTrigger(RenderLayer& layer)
{
Page& page = layer.renderer().page();
if (!page.expectsWheelEventTriggers())
return;
layer.scrollAnimator().setWheelEventTestTrigger(page.testTrigger());
}
void RenderBox::setScrollLeft(int newLeft)
{
if (!hasOverflowClip() || !layer())
return;
setupWheelEventTestTrigger(*layer());
layer()->scrollToXPosition(newLeft, RenderLayer::ScrollOffsetClamped);
}
void RenderBox::setScrollTop(int newTop)
{
if (!hasOverflowClip() || !layer())
return;
setupWheelEventTestTrigger(*layer());
layer()->scrollToYPosition(newTop, RenderLayer::ScrollOffsetClamped);
}
void RenderBox::absoluteRects(Vector<IntRect>& rects, const LayoutPoint& accumulatedOffset) const
{
rects.append(snappedIntRect(accumulatedOffset, size()));
}
void RenderBox::absoluteQuads(Vector<FloatQuad>& quads, bool* wasFixed) const
{
FloatRect localRect(0, 0, width(), height());
RenderFlowThread* flowThread = flowThreadContainingBlock();
if (flowThread && flowThread->absoluteQuadsForBox(quads, wasFixed, this, localRect.y(), localRect.maxY()))
return;
quads.append(localToAbsoluteQuad(localRect, UseTransforms, wasFixed));
}
void RenderBox::updateLayerTransform()
{
// Transform-origin depends on box size, so we need to update the layer transform after layout.
if (hasLayer())
layer()->updateTransform();
}
LayoutUnit RenderBox::constrainLogicalWidthInRegionByMinMax(LayoutUnit logicalWidth, LayoutUnit availableWidth, RenderBlock& cb, RenderRegion* region) const
{
const RenderStyle& styleToUse = style();
if (!styleToUse.logicalMaxWidth().isUndefined())
logicalWidth = std::min(logicalWidth, computeLogicalWidthInRegionUsing(MaxSize, styleToUse.logicalMaxWidth(), availableWidth, cb, region));
return std::max(logicalWidth, computeLogicalWidthInRegionUsing(MinSize, styleToUse.logicalMinWidth(), availableWidth, cb, region));
}
LayoutUnit RenderBox::constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, std::optional<LayoutUnit> intrinsicContentHeight) const
{
const RenderStyle& styleToUse = style();
if (!styleToUse.logicalMaxHeight().isUndefined()) {
if (std::optional<LayoutUnit> maxH = computeLogicalHeightUsing(MaxSize, styleToUse.logicalMaxHeight(), intrinsicContentHeight))
logicalHeight = std::min(logicalHeight, maxH.value());
}
if (std::optional<LayoutUnit> computedLogicalHeight = computeLogicalHeightUsing(MinSize, styleToUse.logicalMinHeight(), intrinsicContentHeight))
return std::max(logicalHeight, computedLogicalHeight.value());
return logicalHeight;
}
LayoutUnit RenderBox::constrainContentBoxLogicalHeightByMinMax(LayoutUnit logicalHeight, std::optional<LayoutUnit> intrinsicContentHeight) const
{
const RenderStyle& styleToUse = style();
if (!styleToUse.logicalMaxHeight().isUndefined()) {
if (std::optional<LayoutUnit> maxH = computeContentLogicalHeight(MaxSize, styleToUse.logicalMaxHeight(), intrinsicContentHeight))
logicalHeight = std::min(logicalHeight, maxH.value());
}
if (std::optional<LayoutUnit> computedContentLogicalHeight = computeContentLogicalHeight(MinSize, styleToUse.logicalMinHeight(), intrinsicContentHeight))
return std::max(logicalHeight, computedContentLogicalHeight.value());
return logicalHeight;
}
RoundedRect::Radii RenderBox::borderRadii() const
{
auto& style = this->style();
LayoutRect bounds = frameRect();
unsigned borderLeft = style.borderLeftWidth();
unsigned borderTop = style.borderTopWidth();
bounds.moveBy(LayoutPoint(borderLeft, borderTop));
bounds.contract(borderLeft + style.borderRightWidth(), borderTop + style.borderBottomWidth());
return style.getRoundedBorderFor(bounds).radii();
}
LayoutRect RenderBox::contentBoxRect() const
{
LayoutUnit x = borderLeft() + paddingLeft();
if (shouldPlaceBlockDirectionScrollbarOnLeft())
x += verticalScrollbarWidth();
LayoutUnit y = borderTop() + paddingTop();
return LayoutRect(x, y, contentWidth(), contentHeight());
}
IntRect RenderBox::absoluteContentBox() const
{
// This is wrong with transforms and flipped writing modes.
IntRect rect = snappedIntRect(contentBoxRect());
FloatPoint absPos = localToAbsolute();
rect.move(absPos.x(), absPos.y());
return rect;
}
FloatQuad RenderBox::absoluteContentQuad() const
{
LayoutRect rect = contentBoxRect();
return localToAbsoluteQuad(FloatRect(rect));
}
LayoutRect RenderBox::outlineBoundsForRepaint(const RenderLayerModelObject* repaintContainer, const RenderGeometryMap* geometryMap) const
{
LayoutRect box = borderBoundingBox();
adjustRectForOutlineAndShadow(box);
if (repaintContainer != this) {
FloatQuad containerRelativeQuad;
if (geometryMap)
containerRelativeQuad = geometryMap->mapToContainer(box, repaintContainer);
else
containerRelativeQuad = localToContainerQuad(FloatRect(box), repaintContainer);
box = LayoutRect(containerRelativeQuad.boundingBox());
}
// FIXME: layoutDelta needs to be applied in parts before/after transforms and
// repaint containers. https://bugs.webkit.org/show_bug.cgi?id=23308
box.move(view().layoutDelta());
return LayoutRect(snapRectToDevicePixels(box, document().deviceScaleFactor()));
}
void RenderBox::addFocusRingRects(Vector<LayoutRect>& rects, const LayoutPoint& additionalOffset, const RenderLayerModelObject*)
{
if (!size().isEmpty())
rects.append(LayoutRect(additionalOffset, size()));
}
int RenderBox::reflectionOffset() const
{
if (!style().boxReflect())
return 0;
if (style().boxReflect()->direction() == ReflectionLeft || style().boxReflect()->direction() == ReflectionRight)
return valueForLength(style().boxReflect()->offset(), borderBoxRect().width());
return valueForLength(style().boxReflect()->offset(), borderBoxRect().height());
}
LayoutRect RenderBox::reflectedRect(const LayoutRect& r) const
{
if (!style().boxReflect())
return LayoutRect();
LayoutRect box = borderBoxRect();
LayoutRect result = r;
switch (style().boxReflect()->direction()) {
case ReflectionBelow:
result.setY(box.maxY() + reflectionOffset() + (box.maxY() - r.maxY()));
break;
case ReflectionAbove:
result.setY(box.y() - reflectionOffset() - box.height() + (box.maxY() - r.maxY()));
break;
case ReflectionLeft:
result.setX(box.x() - reflectionOffset() - box.width() + (box.maxX() - r.maxX()));
break;
case ReflectionRight:
result.setX(box.maxX() + reflectionOffset() + (box.maxX() - r.maxX()));
break;
}
return result;
}
bool RenderBox::fixedElementLaysOutRelativeToFrame(const FrameView& frameView) const
{
return style().position() == FixedPosition && container()->isRenderView() && frameView.fixedElementsLayoutRelativeToFrame();
}
bool RenderBox::includeVerticalScrollbarSize() const
{
return hasOverflowClip() && layer() && !layer()->hasOverlayScrollbars()
&& (style().overflowY() == OSCROLL || style().overflowY() == OAUTO);
}
bool RenderBox::includeHorizontalScrollbarSize() const
{
return hasOverflowClip() && layer() && !layer()->hasOverlayScrollbars()
&& (style().overflowX() == OSCROLL || style().overflowX() == OAUTO);
}
int RenderBox::verticalScrollbarWidth() const
{
return includeVerticalScrollbarSize() ? layer()->verticalScrollbarWidth() : 0;
}
int RenderBox::horizontalScrollbarHeight() const
{
return includeHorizontalScrollbarSize() ? layer()->horizontalScrollbarHeight() : 0;
}
int RenderBox::intrinsicScrollbarLogicalWidth() const
{
if (!hasOverflowClip())
return 0;
if (isHorizontalWritingMode() && (style().overflowY() == OSCROLL && !hasVerticalScrollbarWithAutoBehavior())) {
ASSERT(layer() && layer()->hasVerticalScrollbar());
return verticalScrollbarWidth();
}
if (!isHorizontalWritingMode() && (style().overflowX() == OSCROLL && !hasHorizontalScrollbarWithAutoBehavior())) {
ASSERT(layer() && layer()->hasHorizontalScrollbar());
return horizontalScrollbarHeight();
}
return 0;
}
bool RenderBox::scrollLayer(ScrollDirection direction, ScrollGranularity granularity, float multiplier, Element** stopElement)
{
RenderLayer* boxLayer = layer();
if (boxLayer && boxLayer->scroll(direction, granularity, multiplier)) {
if (stopElement)
*stopElement = element();
return true;
}
return false;
}
bool RenderBox::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier, Element** stopElement, RenderBox* startBox, const IntPoint& wheelEventAbsolutePoint)
{
if (scrollLayer(direction, granularity, multiplier, stopElement))
return true;
if (stopElement && *stopElement && *stopElement == element())
return true;
RenderBlock* nextScrollBlock = containingBlock();
if (is<RenderNamedFlowThread>(nextScrollBlock)) {
ASSERT(startBox);
nextScrollBlock = downcast<RenderNamedFlowThread>(*nextScrollBlock).fragmentFromAbsolutePointAndBox(wheelEventAbsolutePoint, *startBox);
}
if (nextScrollBlock && !nextScrollBlock->isRenderView())
return nextScrollBlock->scroll(direction, granularity, multiplier, stopElement, startBox, wheelEventAbsolutePoint);
return false;
}
bool RenderBox::logicalScroll(ScrollLogicalDirection direction, ScrollGranularity granularity, float multiplier, Element** stopElement)
{
bool scrolled = false;
RenderLayer* l = layer();
if (l) {
#if PLATFORM(COCOA)
// On Mac only we reset the inline direction position when doing a document scroll (e.g., hitting Home/End).
if (granularity == ScrollByDocument)
scrolled = l->scroll(logicalToPhysical(ScrollInlineDirectionBackward, isHorizontalWritingMode(), style().isFlippedBlocksWritingMode()), ScrollByDocument, multiplier);
#endif
if (l->scroll(logicalToPhysical(direction, isHorizontalWritingMode(), style().isFlippedBlocksWritingMode()), granularity, multiplier))
scrolled = true;
if (scrolled) {
if (stopElement)
*stopElement = element();
return true;
}
}
if (stopElement && *stopElement && *stopElement == element())
return true;
RenderBlock* b = containingBlock();
if (b && !b->isRenderView())
return b->logicalScroll(direction, granularity, multiplier, stopElement);
return false;
}
bool RenderBox::canBeScrolledAndHasScrollableArea() const
{
return canBeProgramaticallyScrolled() && (hasHorizontalOverflow() || hasVerticalOverflow());
}
bool RenderBox::isScrollableOrRubberbandableBox() const
{
return canBeScrolledAndHasScrollableArea();
}
// FIXME: This is badly named. overflow:hidden can be programmatically scrolled, yet this returns false in that case.
bool RenderBox::canBeProgramaticallyScrolled() const
{
if (isRenderView())
return true;
if (!hasOverflowClip())
return false;
if (hasScrollableOverflowX() || hasScrollableOverflowY())
return true;
return element() && element()->hasEditableStyle();
}
bool RenderBox::usesCompositedScrolling() const
{
return hasOverflowClip() && hasLayer() && layer()->usesCompositedScrolling();
}
void RenderBox::autoscroll(const IntPoint& position)
{
if (layer())
layer()->autoscroll(position);
}
// There are two kinds of renderer that can autoscroll.
bool RenderBox::canAutoscroll() const
{
if (isRenderView())
return view().frameView().isScrollable();
// Check for a box that can be scrolled in its own right.
if (canBeScrolledAndHasScrollableArea())
return true;
return false;
}
// If specified point is in border belt, returned offset denotes direction of
// scrolling.
IntSize RenderBox::calculateAutoscrollDirection(const IntPoint& windowPoint) const
{
IntRect box(absoluteBoundingBoxRect());
box.moveBy(view().frameView().scrollPosition());
IntRect windowBox = view().frameView().contentsToWindow(box);
IntPoint windowAutoscrollPoint = windowPoint;
if (windowAutoscrollPoint.x() < windowBox.x() + autoscrollBeltSize)
windowAutoscrollPoint.move(-autoscrollBeltSize, 0);
else if (windowAutoscrollPoint.x() > windowBox.maxX() - autoscrollBeltSize)
windowAutoscrollPoint.move(autoscrollBeltSize, 0);
if (windowAutoscrollPoint.y() < windowBox.y() + autoscrollBeltSize)
windowAutoscrollPoint.move(0, -autoscrollBeltSize);
else if (windowAutoscrollPoint.y() > windowBox.maxY() - autoscrollBeltSize)
windowAutoscrollPoint.move(0, autoscrollBeltSize);
return windowAutoscrollPoint - windowPoint;
}
RenderBox* RenderBox::findAutoscrollable(RenderObject* renderer)
{
while (renderer && !(is<RenderBox>(*renderer) && downcast<RenderBox>(*renderer).canAutoscroll())) {
if (is<RenderView>(*renderer) && renderer->document().ownerElement())
renderer = renderer->document().ownerElement()->renderer();
else
renderer = renderer->parent();
}
return is<RenderBox>(renderer) ? downcast<RenderBox>(renderer) : nullptr;
}
void RenderBox::panScroll(const IntPoint& source)
{
if (layer())
layer()->panScrollFromPoint(source);
}
bool RenderBox::hasVerticalScrollbarWithAutoBehavior() const
{
bool overflowScrollActsLikeAuto = style().overflowY() == OSCROLL && !style().hasPseudoStyle(SCROLLBAR) && ScrollbarTheme::theme().usesOverlayScrollbars();
return hasOverflowClip() && (style().overflowY() == OAUTO || style().overflowY() == OOVERLAY || overflowScrollActsLikeAuto);
}