DEV/flutter_flutter
1
0
Fork 0
mirror of https://github.com/flutter/flutter.git synced 2026-02-20 02:29:02 +08:00
Code Issues Packages Projects Releases Wiki Activity
flutter_flutter/sky/engine/core/rendering/RenderBox.cpp
Adam Barth 21d7575716 Add Paragraph#getPositionForOffset 
We'll use this function to position the caret when the user taps a text
input control.

Very little of the code in this patch is actually new. Most of it is
restoring code that we previously removed from the engine. I've made
some small changes to the restored code to handle the lack of a DOM. The
only major change is to RenderObject::createPositionWithAffinity, which
now just returns the values it captures instead of trying to compute a
DOM position.

TextAffinity and TextPosition are lifted from package:flutter. Once this
patch rolls into package:flutter, I'll remove the declarations there.
2016-01-29 23:07:51 -08:00

2905 lines
133 KiB
C++
Raw Blame History

/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
* (C) 2005, 2006 Samuel Weinig (sam.weinig@gmail.com)
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
* Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "sky/engine/core/rendering/RenderBox.h"
#include <math.h>
#include <algorithm>
#include "sky/engine/core/rendering/HitTestResult.h"
#include "sky/engine/core/rendering/HitTestingTransformState.h"
#include "sky/engine/core/rendering/PaintInfo.h"
#include "sky/engine/core/rendering/RenderFlexibleBox.h"
#include "sky/engine/core/rendering/RenderGeometryMap.h"
#include "sky/engine/core/rendering/RenderInline.h"
#include "sky/engine/core/rendering/RenderLayer.h"
#include "sky/engine/core/rendering/RenderView.h"
#include "sky/engine/platform/LengthFunctions.h"
#include "sky/engine/platform/geometry/FloatQuad.h"
#include "sky/engine/platform/geometry/TransformState.h"
#include "sky/engine/platform/graphics/GraphicsContextStateSaver.h"
namespace blink {
RenderBox::RenderBox()
: m_intrinsicContentLogicalHeight(-1)
, m_minPreferredLogicalWidth(-1)
, m_maxPreferredLogicalWidth(-1)
{
setIsBox();
}
void RenderBox::willBeDestroyed()
{
clearOverrideSize();
RenderBlock::removePercentHeightDescendantIfNeeded(this);
RenderBoxModelObject::willBeDestroyed();
destroyLayer();
}
void RenderBox::destroyLayer()
{
setHasLayer(false);
m_layer = nullptr;
}
void RenderBox::createLayer(LayerType type)
{
ASSERT(!m_layer);
m_layer = adoptPtr(new RenderLayer(this, type));
setHasLayer(true);
m_layer->insertOnlyThisLayer();
}
bool RenderBox::hasSelfPaintingLayer() const
{
return m_layer && m_layer->isSelfPaintingLayer();
}
void RenderBox::removeFloatingOrPositionedChildFromBlockLists()
{
ASSERT(isFloatingOrOutOfFlowPositioned());
if (documentBeingDestroyed())
return;
if (isOutOfFlowPositioned())
RenderBlock::removePositionedObject(this);
}
void RenderBox::styleWillChange(StyleDifference diff, const RenderStyle& newStyle)
{
RenderStyle* oldStyle = style();
if (oldStyle && parent()) {
// When a layout hint happens and an object's position style changes, we have to do a layout
// to dirty the render tree using the old position value now.
if (diff.needsFullLayout() && oldStyle->position() != newStyle.position()) {
markContainingBlocksForLayout();
if (newStyle.hasOutOfFlowPosition())
parent()->setChildNeedsLayout();
}
if (oldStyle->hasAutoClip() != newStyle.hasAutoClip()
|| oldStyle->clip() != newStyle.clip())
layer()->clipper().clearClipRectsIncludingDescendants();
}
RenderBoxModelObject::styleWillChange(diff, newStyle);
}
void RenderBox::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
{
bool hadTransform = hasTransform();
RenderObject::styleDidChange(diff, oldStyle);
updateFromStyle();
LayerType type = layerTypeRequired();
if (type != NoLayer) {
if (!layer()) {
createLayer(type);
if (parent() && !needsLayout()) {
// FIXME: We should call a specialized version of this function.
layer()->updateLayerPositionsAfterLayout();
}
}
} else if (layer() && layer()->parent()) {
setHasTransform(false); // Either a transform wasn't specified or the object doesn't support transforms, so just null out the bit.
layer()->removeOnlyThisLayer(); // calls destroyLayer() which clears m_layer
if (hadTransform)
setNeedsLayoutAndPrefWidthsRecalc();
}
if (layer()) {
// FIXME: Ideally we shouldn't need this setter but we can't easily infer an overflow-only layer
// from the style.
layer()->setLayerType(type);
layer()->styleChanged(diff, oldStyle);
}
updateTransform(oldStyle);
if (needsLayout() && oldStyle)
RenderBlock::removePercentHeightDescendantIfNeeded(this);
}
void RenderBox::updateTransformationMatrix()
{
if (m_transform) {
m_transform->makeIdentity();
style()->applyTransform(*m_transform, pixelSnappedBorderBoxRect().size(), RenderStyle::IncludeTransformOrigin);
// FIXME(sky): We shouldn't need to do this once Skia has 4x4 matrix support.
// Until then, 3d transforms don't work right.
m_transform->makeAffine();
}
}
void RenderBox::updateTransform(const RenderStyle* oldStyle)
{
if (oldStyle && style()->transformDataEquivalent(*oldStyle))
return;
// hasTransform() on the renderer is also true when there is transform-style: preserve-3d or perspective set,
// so check style too.
bool localHasTransform = hasTransform() && style()->hasTransform();
bool had3DTransform = has3DTransform();
bool hadTransform = m_transform;
if (localHasTransform != hadTransform) {
if (localHasTransform)
m_transform = adoptPtr(new TransformationMatrix);
else
m_transform.clear();
// Layers with transforms act as clip rects roots, so clear the cached clip rects here.
if (layer())
layer()->clipper().clearClipRectsIncludingDescendants();
}
updateTransformationMatrix();
if (layer() && had3DTransform != has3DTransform())
layer()->dirty3DTransformedDescendantStatus();
}
// TODO(ojan): Inline this into styleDidChange,
void RenderBox::updateFromStyle()
{
RenderStyle* styleToUse = style();
setHasBoxDecorationBackground(hasBackground() || styleToUse->hasBorder() || styleToUse->boxShadow());
setInline(styleToUse->isDisplayInlineType());
setPositionState(styleToUse->position());
if (isRenderView()) {
// TODO(ojan): Merge this into the same call above.
setHasBoxDecorationBackground(true);
} else if (isRenderBlock()) {
// TODO(esprehn): Why do we not want to set this on the RenderView?
setHasOverflowClip(!styleToUse->isOverflowVisible());
}
setHasTransform(styleToUse->hasTransformRelatedProperty());
updateFilters();
}
void RenderBox::updateFilters()
{
if (!style()->hasFilter()) {
m_filterRenderer = nullptr;
return;
}
m_filterRenderer = FilterEffectRenderer::create();
// If the filter fails to build, remove it from the layer. It will still attempt to
// go through regular processing (e.g. compositing), but never apply anything.
if (!m_filterRenderer->build(this, style()->filter()))
m_filterRenderer = nullptr;
}
void RenderBox::layout()
{
ASSERT(needsLayout());
RenderObject* child = slowFirstChild();
if (!child) {
clearNeedsLayout();
return;
}
while (child) {
child->layoutIfNeeded();
ASSERT(!child->needsLayout());
child = child->nextSibling();
}
clearNeedsLayout();
}
// More IE extensions. clientWidth and clientHeight represent the interior of an object
// excluding border and scrollbar.
LayoutUnit RenderBox::clientWidth() const
{
return width() - borderLeft() - borderRight();
}
LayoutUnit RenderBox::clientHeight() const
{
return height() - borderTop() - borderBottom();
}
int RenderBox::pixelSnappedClientWidth() const
{
return snapSizeToPixel(clientWidth(), x() + clientLeft());
}
int RenderBox::pixelSnappedClientHeight() const
{
return snapSizeToPixel(clientHeight(), y() + clientTop());
}
int RenderBox::pixelSnappedOffsetWidth() const
{
return snapSizeToPixel(offsetWidth(), x() + clientLeft());
}
int RenderBox::pixelSnappedOffsetHeight() const
{
return snapSizeToPixel(offsetHeight(), y() + clientTop());
}
void RenderBox::absoluteQuads(Vector<FloatQuad>& quads) const
{
quads.append(localToAbsoluteQuad(FloatRect(0, 0, width().toFloat(), height().toFloat()), 0 /* mode */));
}
void RenderBox::updateLayerTransformAfterLayout()
{
// Transform-origin depends on box size, so we need to update the transform after layout.
updateTransformationMatrix();
}
LayoutUnit RenderBox::constrainLogicalWidthByMinMax(LayoutUnit logicalWidth, LayoutUnit availableWidth, RenderBlock* cb) const
{
RenderStyle* styleToUse = style();
if (!styleToUse->logicalMaxWidth().isMaxSizeNone())
logicalWidth = std::min(logicalWidth, computeLogicalWidthUsing(MaxSize, styleToUse->logicalMaxWidth(), availableWidth, cb));
return std::max(logicalWidth, computeLogicalWidthUsing(MinSize, styleToUse->logicalMinWidth(), availableWidth, cb));
}
LayoutUnit RenderBox::constrainLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const
{
RenderStyle* styleToUse = style();
if (!styleToUse->logicalMaxHeight().isMaxSizeNone()) {
LayoutUnit maxH = computeLogicalHeightUsing(styleToUse->logicalMaxHeight(), intrinsicContentHeight);
if (maxH != -1)
logicalHeight = std::min(logicalHeight, maxH);
}
return std::max(logicalHeight, computeLogicalHeightUsing(styleToUse->logicalMinHeight(), intrinsicContentHeight));
}
LayoutUnit RenderBox::constrainContentBoxLogicalHeightByMinMax(LayoutUnit logicalHeight, LayoutUnit intrinsicContentHeight) const
{
RenderStyle* styleToUse = style();
if (!styleToUse->logicalMaxHeight().isMaxSizeNone()) {
LayoutUnit maxH = computeContentLogicalHeight(styleToUse->logicalMaxHeight(), intrinsicContentHeight);
if (maxH != -1)
logicalHeight = std::min(logicalHeight, maxH);
}
return std::max(logicalHeight, computeContentLogicalHeight(styleToUse->logicalMinHeight(), intrinsicContentHeight));
}
IntRect RenderBox::absoluteContentBox() const
{
// This is wrong with transforms and flipped writing modes.
IntRect rect = pixelSnappedIntRect(contentBoxRect());
FloatPoint absPos = localToAbsolute();
rect.move(absPos.x(), absPos.y());
return rect;
}
FloatQuad RenderBox::absoluteContentQuad() const
{
LayoutRect rect = contentBoxRect();
return localToAbsoluteQuad(FloatRect(rect));
}
FloatPoint RenderBox::perspectiveOrigin() const
{
if (!hasTransform())
return FloatPoint();
const LayoutRect borderBox = borderBoxRect();
return FloatPoint(
floatValueForLength(style()->perspectiveOriginX(), borderBox.width().toFloat()),
floatValueForLength(style()->perspectiveOriginY(), borderBox.height().toFloat()));
}
void RenderBox::addFocusRingRects(Vector<IntRect>& rects, const LayoutPoint& additionalOffset, const RenderBox*) const
{
if (!size().isEmpty())
rects.append(pixelSnappedIntRect(additionalOffset, size()));
}
bool RenderBox::needsPreferredWidthsRecalculation() const
{
return style()->paddingStart().isPercent() || style()->paddingEnd().isPercent();
}
void RenderBox::computeIntrinsicLogicalWidths(LayoutUnit& minLogicalWidth, LayoutUnit& maxLogicalWidth) const
{
minLogicalWidth = minPreferredLogicalWidth() - borderAndPaddingLogicalWidth();
maxLogicalWidth = maxPreferredLogicalWidth() - borderAndPaddingLogicalWidth();
}
LayoutUnit RenderBox::minPreferredLogicalWidth() const
{
if (preferredLogicalWidthsDirty()) {
#if ENABLE(ASSERT)
SetLayoutNeededForbiddenScope layoutForbiddenScope(const_cast<RenderBox&>(*this));
#endif
const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
}
return m_minPreferredLogicalWidth;
}
LayoutUnit RenderBox::maxPreferredLogicalWidth() const
{
if (preferredLogicalWidthsDirty()) {
#if ENABLE(ASSERT)
SetLayoutNeededForbiddenScope layoutForbiddenScope(const_cast<RenderBox&>(*this));
#endif
const_cast<RenderBox*>(this)->computePreferredLogicalWidths();
}
return m_maxPreferredLogicalWidth;
}
void RenderBox::setMinPreferredLogicalWidth(LayoutUnit width)
{
m_minPreferredLogicalWidth = width;
}
void RenderBox::setMaxPreferredLogicalWidth(LayoutUnit width)
{
m_maxPreferredLogicalWidth = width;
}
bool RenderBox::hasOverrideHeight() const
{
return m_rareData && m_rareData->m_overrideLogicalContentHeight != -1;
}
bool RenderBox::hasOverrideWidth() const
{
return m_rareData && m_rareData->m_overrideLogicalContentWidth != -1;
}
void RenderBox::setOverrideLogicalContentHeight(LayoutUnit height)
{
ASSERT(height >= 0);
ensureRareData().m_overrideLogicalContentHeight = height;
}
void RenderBox::setOverrideLogicalContentWidth(LayoutUnit width)
{
ASSERT(width >= 0);
ensureRareData().m_overrideLogicalContentWidth = width;
}
void RenderBox::clearOverrideLogicalContentHeight()
{
if (m_rareData)
m_rareData->m_overrideLogicalContentHeight = -1;
}
void RenderBox::clearOverrideLogicalContentWidth()
{
if (m_rareData)
m_rareData->m_overrideLogicalContentWidth = -1;
}
void RenderBox::clearOverrideSize()
{
clearOverrideLogicalContentHeight();
clearOverrideLogicalContentWidth();
}
LayoutUnit RenderBox::overrideLogicalContentWidth() const
{
ASSERT(hasOverrideWidth());
return m_rareData->m_overrideLogicalContentWidth;
}
LayoutUnit RenderBox::overrideLogicalContentHeight() const
{
ASSERT(hasOverrideHeight());
return m_rareData->m_overrideLogicalContentHeight;
}
LayoutUnit RenderBox::adjustBorderBoxLogicalWidthForBoxSizing(LayoutUnit width) const
{
LayoutUnit bordersPlusPadding = borderAndPaddingLogicalWidth();
if (style()->boxSizing() == CONTENT_BOX)
return width + bordersPlusPadding;
return std::max(width, bordersPlusPadding);
}
LayoutUnit RenderBox::adjustBorderBoxLogicalHeightForBoxSizing(LayoutUnit height) const
{
LayoutUnit bordersPlusPadding = borderAndPaddingLogicalHeight();
if (style()->boxSizing() == CONTENT_BOX)
return height + bordersPlusPadding;
return std::max(height, bordersPlusPadding);
}
LayoutUnit RenderBox::adjustContentBoxLogicalWidthForBoxSizing(LayoutUnit width) const
{
if (style()->boxSizing() == BORDER_BOX)
width -= borderAndPaddingLogicalWidth();
return std::max<LayoutUnit>(0, width);
}
LayoutUnit RenderBox::adjustContentBoxLogicalHeightForBoxSizing(LayoutUnit height) const
{
if (style()->boxSizing() == BORDER_BOX)
height -= borderAndPaddingLogicalHeight();
return std::max<LayoutUnit>(0, height);
}
bool RenderBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset)
{
LayoutPoint adjustedLocation = accumulatedOffset + location();
// Check kids first.
for (RenderObject* child = slowLastChild(); child; child = child->previousSibling()) {
if ((!child->hasLayer() || !toRenderBox(child)->layer()->isSelfPaintingLayer()) && child->nodeAtPoint(request, result, locationInContainer, adjustedLocation)) {
updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
return true;
}
}
// Check our bounds next.
LayoutRect boundsRect = borderBoxRect();
boundsRect.moveBy(adjustedLocation);
if (visibleToHitTestRequest(request) && locationInContainer.intersects(boundsRect)) {
updateHitTestResult(result, locationInContainer.point() - toLayoutSize(adjustedLocation));
return true;
}
return false;
}
PassRefPtr<HitTestingTransformState> RenderBox::createLocalTransformState(
RenderLayer* rootLayer, RenderLayer* containerLayer,
const LayoutRect& hitTestRect, const HitTestLocation& hitTestLocation,
const HitTestingTransformState* containerTransformState) const
{
RefPtr<HitTestingTransformState> transformState;
LayoutPoint offset;
if (containerTransformState) {
// If we're already computing transform state, then it's relative to the container (which we know is non-null).
transformState = HitTestingTransformState::create(*containerTransformState);
layer()->convertToLayerCoords(containerLayer, offset);
} else {
// If this is the first time we need to make transform state, then base it off of hitTestLocation,
// which is relative to rootLayer.
transformState = HitTestingTransformState::create(hitTestLocation.transformedPoint(), hitTestLocation.transformedRect(), FloatQuad(hitTestRect));
layer()->convertToLayerCoords(rootLayer, offset);
}
RenderObject* containerRenderer = containerLayer ? containerLayer->renderer() : 0;
if (shouldUseTransformFromContainer(containerRenderer)) {
TransformationMatrix containerTransform;
getTransformFromContainer(containerRenderer, toLayoutSize(offset), containerTransform);
transformState->applyTransform(containerTransform, HitTestingTransformState::AccumulateTransform);
} else {
transformState->translate(offset.x(), offset.y(), HitTestingTransformState::AccumulateTransform);
}
return transformState;
}
// Compute the z-offset of the point in the transformState.
// This is effectively projecting a ray normal to the plane of ancestor, finding where that
// ray intersects target, and computing the z delta between those two points.
static double computeZOffset(const HitTestingTransformState& transformState)
{
// We got an affine transform, so no z-offset
if (transformState.m_accumulatedTransform.isAffine())
return 0;
// Flatten the point into the target plane
FloatPoint targetPoint = transformState.mappedPoint();
// Now map the point back through the transform, which computes Z.
FloatPoint3D backmappedPoint = transformState.m_accumulatedTransform.mapPoint(FloatPoint3D(targetPoint));
return backmappedPoint.z();
}
static bool isHitCandidate(bool canDepthSort, double* zOffset, const HitTestingTransformState* transformState)
{
// The hit layer is depth-sorting with other layers, so just say that it was hit.
if (canDepthSort)
return true;
// We need to look at z-depth to decide if this layer was hit.
if (zOffset) {
ASSERT(transformState);
// This is actually computing our z, but that's OK because the hitLayer is coplanar with us.
double childZOffset = computeZOffset(*transformState);
if (childZOffset > *zOffset) {
*zOffset = childZOffset;
return true;
}
return false;
}
return true;
}
static inline bool forwardCompareZIndex(RenderBox* first, RenderBox* second)
{
return first->style()->zIndex() < second->style()->zIndex();
}
// hitTestLocation and hitTestRect are relative to rootLayer.
// A 'flattening' layer is one preserves3D() == false.
// transformState.m_accumulatedTransform holds the transform from the containing flattening layer.
// transformState.m_lastPlanarPoint is the hitTestLocation in the plane of the containing flattening layer.
// transformState.m_lastPlanarQuad is the hitTestRect as a quad in the plane of the containing flattening layer.
//
// If zOffset is non-null (which indicates that the caller wants z offset information),
// *zOffset on return is the z offset of the hit point relative to the containing flattening layer.
bool RenderBox::hitTestLayer(RenderLayer* rootLayer, RenderLayer* containerLayer, const HitTestRequest& request, HitTestResult& result,
const LayoutRect& hitTestRect, const HitTestLocation& hitTestLocation,
const HitTestingTransformState* transformState, double* zOffset)
{
ASSERT(layer()->isSelfPaintingLayer());
// The natural thing would be to keep HitTestingTransformState on the stack, but it's big, so we heap-allocate.
RefPtr<HitTestingTransformState> localTransformState;
LayoutRect localHitTestRect = hitTestRect;
HitTestLocation localHitTestLocation = hitTestLocation;
// We need transform state for the first time, or to offset the container state, or to accumulate the new transform.
if (transform() || transformState || layer()->has3DTransformedDescendant() || style()->preserves3D())
localTransformState = createLocalTransformState(rootLayer, containerLayer, localHitTestRect, localHitTestLocation, transformState);
// Apply a transform if we have one.
if (transform()) {
// The RenderView cannot have transforms.
ASSERT(parent());
// Make sure the parent's clip rects have been calculated.
ClipRect clipRect = layer()->clipper().backgroundClipRect(ClipRectsContext(rootLayer, RootRelativeClipRects));
// Go ahead and test the enclosing clip now.
if (!clipRect.intersects(localHitTestLocation))
return 0;
// If the transform can't be inverted, then don't hit test this layer at all.
if (!localTransformState->m_accumulatedTransform.isInvertible())
return 0;
// Compute the point and the hit test rect in the coords of this layer by using the values
// from the transformState, which store the point and quad in the coords of the last flattened
// layer, and the accumulated transform which lets up map through preserve-3d layers.
//
// We can't just map hitTestLocation and hitTestRect because they may have been flattened (losing z)
// by our container.
FloatPoint localPoint = localTransformState->mappedPoint();
FloatQuad localPointQuad = localTransformState->mappedQuad();
localHitTestRect = localTransformState->boundsOfMappedArea();
if (localHitTestLocation.isRectBasedTest())
localHitTestLocation = HitTestLocation(localPoint, localPointQuad);
else
localHitTestLocation = HitTestLocation(localPoint);
// Now do a hit test with the root layer shifted to be us.
rootLayer = layer();
}
// Ensure our lists and 3d status are up-to-date.
layer()->stackingNode()->updateLayerListsIfNeeded();
layer()->update3DTransformedDescendantStatus();
RefPtr<HitTestingTransformState> unflattenedTransformState = localTransformState;
if (localTransformState && !style()->preserves3D()) {
// Keep a copy of the pre-flattening state, for computing z-offsets for the container
unflattenedTransformState = HitTestingTransformState::create(*localTransformState);
// This layer is flattening, so flatten the state passed to descendants.
localTransformState->flatten();
}
// The following are used for keeping track of the z-depth of the hit point of 3d-transformed
// descendants.
double localZOffset = -std::numeric_limits<double>::infinity();
double* zOffsetForDescendantsPtr = 0;
double* zOffsetForContentsPtr = 0;
bool depthSortDescendants = false;
if (style()->preserves3D()) {
depthSortDescendants = true;
// Our layers can depth-test with our container, so share the z depth pointer with the container, if it passed one down.
zOffsetForDescendantsPtr = zOffset ? zOffset : &localZOffset;
zOffsetForContentsPtr = zOffset ? zOffset : &localZOffset;
} else if (zOffset) {
zOffsetForDescendantsPtr = 0;
// Container needs us to give back a z offset for the hit layer.
zOffsetForContentsPtr = zOffset;
}
Vector<RenderBox*> layers;
collectSelfPaintingLayers(layers);
// Hit testing needs to walk in the backwards direction from paint.
// Forward compare and then reverse instead of just reverse comparing
// so that elements with the same z-index are walked in reverse tree order.
std::stable_sort(layers.begin(), layers.end(), forwardCompareZIndex);
layers.reverse();
bool hitLayer = false;
for (auto& currentLayer : layers) {
HitTestResult tempResult(result.hitTestLocation());
bool localHitLayer = currentLayer->hitTestLayer(rootLayer, layer(), request, tempResult,
localHitTestRect, localHitTestLocation, localTransformState.get(), zOffsetForDescendantsPtr);
// If it a rect-based test, we can safely append the temporary result since it might had hit
// nodes but not necesserily had hitLayer set.
if (result.isRectBasedTest())
result.append(tempResult);
if (localHitLayer && isHitCandidate(depthSortDescendants, zOffset, unflattenedTransformState.get())) {
hitLayer = localHitLayer;
if (!result.isRectBasedTest())
result = tempResult;
if (!depthSortDescendants)
return true;
}
}
LayoutRect layerBounds;
ClipRect contentRect;
ClipRectsContext clipRectsContext(rootLayer, RootRelativeClipRects);
layer()->clipper().calculateRects(clipRectsContext, localHitTestRect, layerBounds, contentRect);
// Next we want to see if the mouse pos is inside the child RenderObjects of the layer.
if (contentRect.intersects(localHitTestLocation)) {
// Hit test with a temporary HitTestResult, because we only want to commit to 'result' if we know we're frontmost.
HitTestResult tempResult(result.hitTestLocation());
if (hitTestNonLayerDescendants(request, tempResult, layerBounds, localHitTestLocation)
&& isHitCandidate(false, zOffsetForContentsPtr, unflattenedTransformState.get())) {
if (result.isRectBasedTest())
result.append(tempResult);
else
result = tempResult;
if (!depthSortDescendants)
return true;
// Foreground can depth-sort with descendant layers, so keep this as a candidate.
hitLayer = true;
} else if (result.isRectBasedTest()) {
result.append(tempResult);
}
}
return hitLayer;
}
bool RenderBox::hitTestNonLayerDescendants(const HitTestRequest& request, HitTestResult& result,
const LayoutRect& layerBounds, const HitTestLocation& hitTestLocation)
{
return hitTest(request, result, hitTestLocation, toLayoutPoint(layerBounds.location() - location()));
}
// --------------------- painting stuff -------------------------------
void RenderBox::paintLayer(GraphicsContext* context, const LayerPaintingInfo& paintingInfo)
{
// If this layer is totally invisible then there is nothing to paint.
// TODO(ojan): Return false from isSelfPainting and then ASSERT(!opacity()) here.
if (!opacity())
return;
if (!transform()) {
paintLayerContents(context, paintingInfo);
return;
}
// The RenderView can't be transformed in Sky.
ASSERT(layer()->parent());
// If the transform can't be inverted, then don't paint anything.
if (!transform()->isInvertible())
return;
// Make sure the parent's clip rects have been calculated.
ClipRectsContext clipRectsContext(paintingInfo.rootLayer, PaintingClipRects);
ClipRect clipRect = layer()->clipper().backgroundClipRect(clipRectsContext);
clipRect.intersect(paintingInfo.paintDirtyRect);
// Push the parent coordinate space's clip.
layer()->parent()->clipToRect(paintingInfo, context, clipRect);
// This involves subtracting out the position of the layer in our current coordinate space, but preserving
// the accumulated error for sub-pixel layout.
LayoutPoint delta;
layer()->convertToLayerCoords(paintingInfo.rootLayer, delta);
TransformationMatrix localTransform(*transform());
IntPoint roundedDelta = roundedIntPoint(delta);
localTransform.translateRight(roundedDelta.x(), roundedDelta.y());
LayoutSize adjustedSubPixelAccumulation = paintingInfo.subPixelAccumulation + (delta - roundedDelta);
// Apply the transform.
GraphicsContextStateSaver stateSaver(*context, false);
if (!localTransform.isIdentity()) {
stateSaver.save();
context->concatCTM(localTransform.toAffineTransform());
}
// Now do a paint with the root layer shifted to be us.
LayerPaintingInfo transformedPaintingInfo(layer(), enclosingIntRect(localTransform.inverse().mapRect(paintingInfo.paintDirtyRect)),
adjustedSubPixelAccumulation);
paintLayerContents(context, transformedPaintingInfo);
// Restore the clip.
layer()->parent()->restoreClip(context, paintingInfo.paintDirtyRect, clipRect);
}
static LayoutRect transparencyClipBox(const RenderLayer*, const RenderLayer* rootLayer, const LayoutSize& subPixelAccumulation);
static void expandClipRectForDescendantsAndReflection(LayoutRect& clipRect, const RenderLayer* layer, const RenderLayer* rootLayer,
const LayoutSize& subPixelAccumulation)
{
// Note: we don't have to walk z-order lists since transparent elements always establish
// a stacking container. This means we can just walk the layer tree directly.
for (RenderLayer* curr = layer->firstChild(); curr; curr = curr->nextSibling())
clipRect.unite(transparencyClipBox(curr, rootLayer, subPixelAccumulation));
}
static LayoutRect transparencyClipBox(const RenderLayer* layer, const RenderLayer* rootLayer,
const LayoutSize& subPixelAccumulation)
{
// FIXME: Although this function completely ignores CSS-imposed clipping, we did already intersect with the
// paintDirtyRect, and that should cut down on the amount we have to paint. Still it
// would be better to respect clips.
if (rootLayer != layer && layer->renderer()->transform()) {
// The best we can do here is to use enclosed bounding boxes to establish a "fuzzy" enough clip to encompass
// the transformed layer and all of its children.
const RenderLayer* rootLayerForTransform = rootLayer;
LayoutPoint delta;
layer->convertToLayerCoords(rootLayerForTransform, delta);
delta.move(subPixelAccumulation);
IntPoint pixelSnappedDelta = roundedIntPoint(delta);
TransformationMatrix transform;
transform.translate(pixelSnappedDelta.x(), pixelSnappedDelta.y());
transform = transform * *layer->renderer()->transform();
// We don't use fragment boxes when collecting a transformed layer's bounding box, since it always
// paints unfragmented.y
LayoutRect clipRect = layer->physicalBoundingBox(layer);
expandClipRectForDescendantsAndReflection(clipRect, layer, layer, subPixelAccumulation);
layer->renderer()->style()->filterOutsets().expandRect(clipRect);
LayoutRect result = transform.mapRect(clipRect);
return result;
}
LayoutRect clipRect = layer->physicalBoundingBox(rootLayer);
expandClipRectForDescendantsAndReflection(clipRect, layer, rootLayer, subPixelAccumulation);
layer->renderer()->style()->filterOutsets().expandRect(clipRect);
clipRect.move(subPixelAccumulation);
return clipRect;
}
void RenderBox::paintLayerContents(GraphicsContext* context, const LayerPaintingInfo& paintingInfo)
{
float deviceScaleFactor = 1.0f;
context->setDeviceScaleFactor(deviceScaleFactor);
LayoutPoint offsetFromRoot;
layer()->convertToLayerCoords(paintingInfo.rootLayer, offsetFromRoot);
LayerPaintingInfo localPaintingInfo(paintingInfo);
LayoutRect layerBounds;
ClipRect contentRect;
ClipRectsContext clipRectsContext(localPaintingInfo.rootLayer, PaintingClipRects, localPaintingInfo.subPixelAccumulation);
layer()->clipper().calculateRects(clipRectsContext, localPaintingInfo.paintDirtyRect,
layerBounds, contentRect, &offsetFromRoot);
if (!layer()->intersectsDamageRect(layerBounds, contentRect.rect(), localPaintingInfo.rootLayer, &offsetFromRoot))
return;
LayoutRect rootRelativeBounds;
bool rootRelativeBoundsComputed = false;
// Apply clip-path to context.
GraphicsContextStateSaver clipStateSaver(*context, false);
// Clip-path, like border radius, must not be applied to the contents of a composited-scrolling container.
// It must, however, still be applied to the mask layer, so that the compositor can properly mask the
// scrolling contents and scrollbars.
if (hasClipPath()) {
ASSERT(style()->clipPath());
if (style()->clipPath()->type() == ClipPathOperation::SHAPE) {
// Removed.
}
}
if (isTransparent()) {
context->save();
LayoutRect clipRect = intersection(paintingInfo.paintDirtyRect,
transparencyClipBox(layer(), localPaintingInfo.rootLayer, localPaintingInfo.subPixelAccumulation));
context->clip(clipRect);
context->beginTransparencyLayer(opacity());
}
layer()->clipToRect(localPaintingInfo, context, contentRect);
FilterEffectRendererHelper filterPainter(m_filterRenderer && style()->hasFilter());
if (filterPainter.haveFilterEffect()) {
if (!rootRelativeBoundsComputed)
rootRelativeBounds = layer()->physicalBoundingBoxIncludingReflectionAndStackingChildren(paintingInfo.rootLayer, offsetFromRoot);
if (filterPainter.prepareFilterEffect(m_filterRenderer.get(), rootRelativeBounds, paintingInfo.paintDirtyRect))
context = filterPainter.beginFilterEffect(context);
}
LayoutPoint layerLocation = toPoint(layerBounds.location() - location() + localPaintingInfo.subPixelAccumulation);
Vector<RenderBox*> layers;
PaintInfo paintInfo(context, pixelSnappedIntRect(contentRect.rect()), localPaintingInfo.rootLayer->renderer());
paint(paintInfo, layerLocation, layers);
std::stable_sort(layers.begin(), layers.end(), forwardCompareZIndex);
for (auto& box : layers) {
box->paintLayer(context, paintingInfo);
}
if (filterPainter.hasStartedFilterEffect())
context = filterPainter.applyFilterEffect();
layer()->restoreClip(context, localPaintingInfo.paintDirtyRect, contentRect);
if (isTransparent()) {
context->endLayer();
context->restore();
}
}
void RenderBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, Vector<RenderBox*>& layers)
{
LayoutPoint adjustedPaintOffset = paintOffset + location();
for (RenderObject* child = slowFirstChild(); child; child = child->nextSibling())
child->paint(paintInfo, adjustedPaintOffset, layers);
}
BackgroundBleedAvoidance RenderBox::determineBackgroundBleedAvoidance(GraphicsContext* context, const BoxDecorationData& boxDecorationData) const
{
if (!boxDecorationData.hasBackground || !boxDecorationData.hasBorder || !style()->hasBorderRadius())
return BackgroundBleedNone;
// FIXME: See crbug.com/382491. getCTM does not accurately reflect the scale at the time content is
// rasterized, and should not be relied on to make decisions about bleeding.
AffineTransform ctm = context->getCTM();
FloatSize contextScaling(static_cast<float>(ctm.xScale()), static_cast<float>(ctm.yScale()));
// Because RoundedRect uses IntRect internally the inset applied by the
// BackgroundBleedShrinkBackground strategy cannot be less than one integer
// layout coordinate, even with subpixel layout enabled. To take that into
// account, we clamp the contextScaling to 1.0 for the following test so
// that borderObscuresBackgroundEdge can only return true if the border
// widths are greater than 2 in both layout coordinates and screen
// coordinates.
// This precaution will become obsolete if RoundedRect is ever promoted to
// a sub-pixel representation.
if (contextScaling.width() > 1)
contextScaling.setWidth(1);
if (contextScaling.height() > 1)
contextScaling.setHeight(1);
if (borderObscuresBackgroundEdge(contextScaling))
return BackgroundBleedShrinkBackground;
if (borderObscuresBackground() && backgroundHasOpaqueTopLayer())
return BackgroundBleedBackgroundOverBorder;
return BackgroundBleedClipBackground;
}
void RenderBox::paintBoxDecorationBackground(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
LayoutRect paintRect = borderBoxRect();
paintRect.moveBy(paintOffset);
paintBoxDecorationBackgroundWithRect(paintInfo, paintOffset, paintRect);
}
void RenderBox::paintBoxDecorationBackgroundWithRect(PaintInfo& paintInfo, const LayoutPoint& paintOffset, const LayoutRect& paintRect)
{
RenderStyle* style = this->style();
BoxDecorationData boxDecorationData(*style);
BackgroundBleedAvoidance bleedAvoidance = determineBackgroundBleedAvoidance(paintInfo.context, boxDecorationData);
// FIXME: Should eventually give the theme control over whether the box shadow should paint, since controls could have
// custom shadows of their own.
if (!boxShadowShouldBeAppliedToBackground(bleedAvoidance))
paintBoxShadow(paintInfo, paintRect, style, Normal);
GraphicsContextStateSaver stateSaver(*paintInfo.context, false);
if (bleedAvoidance == BackgroundBleedClipBackground) {
stateSaver.save();
RoundedRect border = style->getRoundedBorderFor(paintRect);
paintInfo.context->clipRoundedRect(border);
}
if (bleedAvoidance == BackgroundBleedBackgroundOverBorder)
paintBorder(paintInfo, paintRect, style, bleedAvoidance);
paintBackground(paintInfo, paintRect, boxDecorationData.backgroundColor, bleedAvoidance);
paintBoxShadow(paintInfo, paintRect, style, Inset);
// The theme will tell us whether or not we should also paint the CSS border.
if (boxDecorationData.hasBorder && bleedAvoidance != BackgroundBleedBackgroundOverBorder)
paintBorder(paintInfo, paintRect, style, bleedAvoidance);
}
void RenderBox::paintBackground(const PaintInfo& paintInfo, const LayoutRect& paintRect, const Color& backgroundColor, BackgroundBleedAvoidance bleedAvoidance)
{
paintFillLayers(paintInfo, backgroundColor, style()->backgroundLayers(), paintRect, bleedAvoidance);
}
bool RenderBox::backgroundHasOpaqueTopLayer() const
{
const FillLayer& fillLayer = style()->backgroundLayers();
if (fillLayer.clip() != BorderFillBox)
return false;
if (fillLayer.hasOpaqueImage(this) && fillLayer.hasRepeatXY() && fillLayer.image()->canRender(*this))
return true;
// If there is only one layer and no image, check whether the background color is opaque
if (!fillLayer.next() && !fillLayer.hasImage()) {
Color bgColor = style()->resolveColor(style()->backgroundColor());
if (bgColor.alpha() == 255)
return true;
}
return false;
}
void RenderBox::paintFillLayers(const PaintInfo& paintInfo, const Color& c, const FillLayer& fillLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, RenderObject* backgroundObject)
{
Vector<const FillLayer*, 8> layers;
const FillLayer* curLayer = &fillLayer;
bool shouldDrawBackgroundInSeparateBuffer = false;
while (curLayer) {
layers.append(curLayer);
// Stop traversal when an opaque layer is encountered.
// FIXME : It would be possible for the following occlusion culling test to be more aggressive
// on layers with no repeat by testing whether the image covers the layout rect.
// Testing that here would imply duplicating a lot of calculations that are currently done in
// RenderBoxModelObject::paintFillLayerExtended. A more efficient solution might be to move
// the layer recursion into paintFillLayerExtended, or to compute the layer geometry here
// and pass it down.
if (!shouldDrawBackgroundInSeparateBuffer && curLayer->blendMode() != WebBlendModeNormal)
shouldDrawBackgroundInSeparateBuffer = true;
// The clipOccludesNextLayers condition must be evaluated first to avoid short-circuiting.
if (curLayer->clipOccludesNextLayers(curLayer == &fillLayer) && curLayer->hasOpaqueImage(this) && curLayer->image()->canRender(*this) && curLayer->hasRepeatXY() && curLayer->blendMode() == WebBlendModeNormal && !boxShadowShouldBeAppliedToBackground(bleedAvoidance))
break;
curLayer = curLayer->next();
}
GraphicsContext* context = paintInfo.context;
if (!context)
shouldDrawBackgroundInSeparateBuffer = false;
// FIXME(sky): Propagate this constant.
bool skipBaseColor = 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, backgroundObject, skipBaseColor);
if (shouldDrawBackgroundInSeparateBuffer)
context->endLayer();
}
void RenderBox::paintFillLayer(const PaintInfo& paintInfo, const Color& c, const FillLayer& fillLayer, const LayoutRect& rect,
BackgroundBleedAvoidance bleedAvoidance, RenderObject* backgroundObject, bool skipBaseColor)
{
paintFillLayerExtended(paintInfo, c, fillLayer, rect, bleedAvoidance, 0, LayoutSize(), backgroundObject, skipBaseColor);
}
bool RenderBox::pushContentsClip(PaintInfo& paintInfo, const LayoutPoint& accumulatedOffset, ContentsClipBehavior contentsClipBehavior)
{
bool isOverflowClip = hasOverflowClip() && !layer()->isSelfPaintingLayer();
if (!isOverflowClip)
return false;
LayoutRect clipRect = overflowClipRect(accumulatedOffset);
RoundedRect clipRoundedRect(0, 0, 0, 0);
bool hasBorderRadius = style()->hasBorderRadius();
if (hasBorderRadius)
clipRoundedRect = style()->getRoundedInnerBorderFor(LayoutRect(accumulatedOffset, size()));
if (contentsClipBehavior == SkipContentsClipIfPossible) {
LayoutRect contentsVisualOverflow = contentsVisualOverflowRect();
if (contentsVisualOverflow.isEmpty())
return false;
LayoutRect conservativeClipRect = clipRect;
if (hasBorderRadius)
conservativeClipRect.intersect(clipRoundedRect.radiusCenterRect());
conservativeClipRect.moveBy(-accumulatedOffset);
if (conservativeClipRect.contains(contentsVisualOverflow))
return false;
}
paintInfo.context->save();
if (hasBorderRadius)
paintInfo.context->clipRoundedRect(clipRoundedRect);
paintInfo.context->clip(pixelSnappedIntRect(clipRect));
return true;
}
void RenderBox::popContentsClip(PaintInfo& paintInfo, const LayoutPoint& accumulatedOffset)
{
ASSERT(hasOverflowClip() && !layer()->isSelfPaintingLayer());
paintInfo.context->restore();
}
LayoutRect RenderBox::overflowClipRect(const LayoutPoint& location)
{
LayoutRect clipRect = borderBoxRect();
clipRect.setLocation(location + clipRect.location() + LayoutSize(borderLeft(), borderTop()));
clipRect.setSize(clipRect.size() - LayoutSize(borderLeft() + borderRight(), borderTop() + borderBottom()));
return clipRect;
}
LayoutRect RenderBox::clipRect(const LayoutPoint& location)
{
LayoutRect borderBoxRect = this->borderBoxRect();
LayoutRect clipRect = LayoutRect(borderBoxRect.location() + location, borderBoxRect.size());
if (!style()->clipLeft().isAuto()) {
LayoutUnit c = valueForLength(style()->clipLeft(), borderBoxRect.width());
clipRect.move(c, 0);
clipRect.contract(c, 0);
}
if (!style()->clipRight().isAuto())
clipRect.contract(width() - valueForLength(style()->clipRight(), width()), 0);
if (!style()->clipTop().isAuto()) {
LayoutUnit c = valueForLength(style()->clipTop(), borderBoxRect.height());
clipRect.move(0, c);
clipRect.contract(0, c);
}
if (!style()->clipBottom().isAuto())
clipRect.contract(0, height() - valueForLength(style()->clipBottom(), height()));
return clipRect;
}
LayoutUnit RenderBox::containingBlockLogicalHeightForContent(AvailableLogicalHeightType heightType) const
{
return containingBlock()->availableLogicalHeight(heightType);
}
void RenderBox::mapLocalToContainer(const RenderBox* paintInvalidationContainer, TransformState& transformState, MapCoordinatesFlags mode) const
{
if (paintInvalidationContainer == this)
return;
bool containerSkipped;
RenderObject* o = container(paintInvalidationContainer, &containerSkipped);
if (!o)
return;
LayoutSize containerOffset = offsetFromContainer(o, roundedLayoutPoint(transformState.mappedPoint()));
bool preserve3D = mode & UseTransforms && (o->style()->preserves3D() || style()->preserves3D());
if (mode & UseTransforms && shouldUseTransformFromContainer(o)) {
TransformationMatrix t;
getTransformFromContainer(o, containerOffset, t);
transformState.applyTransform(t, preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
} else
transformState.move(containerOffset.width(), containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
if (containerSkipped) {
// There can't be a transform between paintInvalidationContainer and o, because transforms create containers, so it should be safe
// to just subtract the delta between the paintInvalidationContainer and o.
LayoutSize containerOffset = paintInvalidationContainer->offsetFromAncestorContainer(o);
transformState.move(-containerOffset.width(), -containerOffset.height(), preserve3D ? TransformState::AccumulateTransform : TransformState::FlattenTransform);
return;
}
mode &= ~ApplyContainerFlip;
o->mapLocalToContainer(paintInvalidationContainer, transformState, mode);
}
LayoutSize RenderBox::offsetFromContainer(const RenderObject* o, const LayoutPoint& point, bool* offsetDependsOnPoint) const
{
ASSERT(o == container());
if (!isInline() || isReplaced())
return locationOffset();
return LayoutSize();
}
InlineBox* RenderBox::createInlineBox()
{
return new InlineBox(*this);
}
void RenderBox::dirtyLineBoxes(bool fullLayout)
{
if (inlineBoxWrapper()) {
if (fullLayout) {
inlineBoxWrapper()->destroy();
ASSERT(m_rareData);
m_rareData->m_inlineBoxWrapper = 0;
} else {
inlineBoxWrapper()->dirtyLineBoxes();
}
}
}
void RenderBox::positionLineBox(InlineBox* box)
{
if (isOutOfFlowPositioned()) {
box->remove(DontMarkLineBoxes);
box->destroy();
} else if (isReplaced()) {
setLocation(roundedLayoutPoint(box->topLeft()));
setInlineBoxWrapper(box);
}
}
void RenderBox::deleteLineBoxWrapper()
{
if (inlineBoxWrapper()) {
if (!documentBeingDestroyed())
inlineBoxWrapper()->remove();
inlineBoxWrapper()->destroy();
ASSERT(m_rareData);
m_rareData->m_inlineBoxWrapper = 0;
}
}
void RenderBox::updateLogicalWidth()
{
LogicalExtentComputedValues computedValues;
computeLogicalWidth(computedValues);
setLogicalWidth(computedValues.m_extent);
setLogicalLeft(computedValues.m_position);
setMarginStart(computedValues.m_margins.m_start);
setMarginEnd(computedValues.m_margins.m_end);
}
void RenderBox::computeLogicalWidth(LogicalExtentComputedValues& computedValues) const
{
computedValues.m_extent = logicalWidth();
computedValues.m_position = logicalLeft();
computedValues.m_margins.m_start = marginStart();
computedValues.m_margins.m_end = marginEnd();
if (isOutOfFlowPositioned()) {
// FIXME: This calculation is not patched for block-flow yet.
// https://bugs.webkit.org/show_bug.cgi?id=46500
computePositionedLogicalWidth(computedValues);
return;
}
if (hasOverrideWidth()) {
computedValues.m_extent = overrideLogicalContentWidth() + borderAndPaddingLogicalWidth();
return;
}
bool treatAsReplaced = shouldComputeSizeAsReplaced();
RenderStyle* styleToUse = style();
Length logicalWidthLength = treatAsReplaced ? Length(computeReplacedLogicalWidth(), Fixed) : styleToUse->logicalWidth();
RenderBlock* cb = containingBlock();
LayoutUnit containerLogicalWidth = std::max<LayoutUnit>(0, containingBlockLogicalWidthForContent());
if (isInline() && !isInlineBlock()) {
// just calculate margins
computedValues.m_margins.m_start = minimumValueForLength(styleToUse->marginStart(), containerLogicalWidth);
computedValues.m_margins.m_end = minimumValueForLength(styleToUse->marginEnd(), containerLogicalWidth);
if (treatAsReplaced)
computedValues.m_extent = std::max<LayoutUnit>(floatValueForLength(logicalWidthLength, 0) + borderAndPaddingLogicalWidth(), minPreferredLogicalWidth());
return;
}
// Width calculations
if (treatAsReplaced)
computedValues.m_extent = logicalWidthLength.value() + borderAndPaddingLogicalWidth();
else {
LayoutUnit preferredWidth = computeLogicalWidthUsing(MainOrPreferredSize, styleToUse->logicalWidth(), containerLogicalWidth, cb);
computedValues.m_extent = constrainLogicalWidthByMinMax(preferredWidth, containerLogicalWidth, cb);
}
// Margin calculations.
computeMarginsForDirection(InlineDirection, cb, containerLogicalWidth, computedValues.m_extent, computedValues.m_margins.m_start,
computedValues.m_margins.m_end, style()->marginStart(), style()->marginEnd());
if (containerLogicalWidth && containerLogicalWidth != (computedValues.m_extent + computedValues.m_margins.m_start + computedValues.m_margins.m_end)
&& !isInline() && !cb->isFlexibleBox()) {
LayoutUnit newMargin = containerLogicalWidth - computedValues.m_extent - cb->marginStartForChild(this);
bool hasInvertedDirection = cb->style()->isLeftToRightDirection() != style()->isLeftToRightDirection();
if (hasInvertedDirection)
computedValues.m_margins.m_start = newMargin;
else
computedValues.m_margins.m_end = newMargin;
}
}
LayoutUnit RenderBox::fillAvailableMeasure(LayoutUnit availableLogicalWidth) const
{
LayoutUnit marginStart = minimumValueForLength(style()->marginStart(), availableLogicalWidth);
LayoutUnit marginEnd = minimumValueForLength(style()->marginEnd(), availableLogicalWidth);
return availableLogicalWidth - marginStart - marginEnd;
}
LayoutUnit RenderBox::computeIntrinsicLogicalWidthUsing(const Length& logicalWidthLength, LayoutUnit availableLogicalWidth, LayoutUnit borderAndPadding) const
{
if (logicalWidthLength.type() == FillAvailable)
return fillAvailableMeasure(availableLogicalWidth);
LayoutUnit minLogicalWidth = 0;
LayoutUnit maxLogicalWidth = 0;
computeIntrinsicLogicalWidths(minLogicalWidth, maxLogicalWidth);
if (logicalWidthLength.type() == MinContent)
return minLogicalWidth + borderAndPadding;
if (logicalWidthLength.type() == MaxContent)
return maxLogicalWidth + borderAndPadding;
if (logicalWidthLength.type() == FitContent) {
minLogicalWidth += borderAndPadding;
maxLogicalWidth += borderAndPadding;
return std::max(minLogicalWidth, std::min(maxLogicalWidth, fillAvailableMeasure(availableLogicalWidth)));
}
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit RenderBox::computeLogicalWidthUsing(SizeType widthType, const Length& logicalWidth, LayoutUnit availableLogicalWidth, const RenderBlock* cb) const
{
if (!logicalWidth.isIntrinsicOrAuto()) {
// FIXME: If the containing block flow is perpendicular to our direction we need to use the available logical height instead.
return adjustBorderBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, availableLogicalWidth));
}
if (logicalWidth.isIntrinsic())
return computeIntrinsicLogicalWidthUsing(logicalWidth, availableLogicalWidth, borderAndPaddingLogicalWidth());
LayoutUnit logicalWidthResult = fillAvailableMeasure(availableLogicalWidth);
if (widthType == MainOrPreferredSize && sizesLogicalWidthToFitContent(logicalWidth))
return std::max(minPreferredLogicalWidth(), std::min(maxPreferredLogicalWidth(), logicalWidthResult));
return logicalWidthResult;
}
static bool columnFlexItemHasStretchAlignment(const RenderObject* flexitem)
{
RenderObject* parent = flexitem->parent();
// auto margins mean we don't stretch. Note that this function will only be used for
// widths, so we don't have to check marginBefore/marginAfter.
ASSERT(parent->style()->isColumnFlexDirection());
if (flexitem->style()->marginStart().isAuto() || flexitem->style()->marginEnd().isAuto())
return false;
return flexitem->style()->alignSelf() == ItemPositionStretch || (flexitem->style()->alignSelf() == ItemPositionAuto && parent->style()->alignItems() == ItemPositionStretch);
}
bool RenderBox::sizesLogicalWidthToFitContent(const Length& logicalWidth) const
{
if (isInlineBlock())
return true;
if (logicalWidth.type() == Intrinsic)
return true;
// Flexible box items should shrink wrap, so we lay them out at their intrinsic widths.
// In the case of columns that have a stretch alignment, we go ahead and layout at the
// stretched size to avoid an extra layout when applying alignment.
if (parent()->isFlexibleBox()) {
// For multiline columns, we need to apply align-content first, so we can't stretch now.
if (!parent()->style()->isColumnFlexDirection() || parent()->style()->flexWrap() != FlexNoWrap)
return true;
if (!columnFlexItemHasStretchAlignment(this))
return true;
}
return false;
}
void RenderBox::computeMarginsForDirection(MarginDirection flowDirection, const RenderBlock* containingBlock, LayoutUnit containerWidth, LayoutUnit childWidth, LayoutUnit& marginStart, LayoutUnit& marginEnd, Length marginStartLength, Length marginEndLength) const
{
if (flowDirection == BlockDirection || isInline()) {
// Margins are calculated with respect to the logical width of
// the containing block (8.3)
// Inline blocks/tables and floats don't have their margins increased.
marginStart = minimumValueForLength(marginStartLength, containerWidth);
marginEnd = minimumValueForLength(marginEndLength, containerWidth);
return;
}
if (containingBlock->isFlexibleBox()) {
// We need to let flexbox handle the margin adjustment - otherwise, flexbox
// will think we're wider than we actually are and calculate line sizes wrong.
// See also http://dev.w3.org/csswg/css-flexbox/#auto-margins
if (marginStartLength.isAuto())
marginStartLength.setValue(0);
if (marginEndLength.isAuto())
marginEndLength.setValue(0);
}
LayoutUnit marginStartWidth = minimumValueForLength(marginStartLength, containerWidth);
LayoutUnit marginEndWidth = minimumValueForLength(marginEndLength, containerWidth);
// CSS 2.1 (10.3.3): "If 'width' is not 'auto' and 'border-left-width' + 'padding-left' + 'width' + 'padding-right' + 'border-right-width'
// (plus any of 'margin-left' or 'margin-right' that are not 'auto') is larger than the width of the containing block, then any 'auto'
// values for 'margin-left' or 'margin-right' are, for the following rules, treated as zero.
LayoutUnit marginBoxWidth = childWidth + (!style()->width().isAuto() ? marginStartWidth + marginEndWidth : LayoutUnit());
// CSS 2.1: "If both 'margin-left' and 'margin-right' are 'auto', their used values are equal. This horizontally centers the element
// with respect to the edges of the containing block."
if (marginStartLength.isAuto() && marginEndLength.isAuto() && marginBoxWidth < containerWidth) {
// Other browsers center the margin box for align=center elements so we match them here.
LayoutUnit centeredMarginBoxStart = std::max<LayoutUnit>(0, (containerWidth - childWidth - marginStartWidth - marginEndWidth) / 2);
marginStart = centeredMarginBoxStart + marginStartWidth;
marginEnd = containerWidth - childWidth - marginStart + marginEndWidth;
return;
}
// CSS 2.1: "If there is exactly one value specified as 'auto', its used value follows from the equality."
if (marginEndLength.isAuto() && marginBoxWidth < containerWidth) {
marginStart = marginStartWidth;
marginEnd = containerWidth - childWidth - marginStart;
return;
}
if (marginStartLength.isAuto() && marginBoxWidth < containerWidth) {
marginEnd = marginEndWidth;
marginStart = containerWidth - childWidth - marginEnd;
return;
}
// Either no auto margins, or our margin box width is >= the container width, auto margins will just turn into 0.
marginStart = marginStartWidth;
marginEnd = marginEndWidth;
}
void RenderBox::updateLogicalHeight()
{
m_intrinsicContentLogicalHeight = contentLogicalHeight();
LogicalExtentComputedValues computedValues;
computeLogicalHeight(logicalHeight(), logicalTop(), computedValues);
setLogicalHeight(computedValues.m_extent);
setLogicalTop(computedValues.m_position);
setMarginBefore(computedValues.m_margins.m_before);
setMarginAfter(computedValues.m_margins.m_after);
}
void RenderBox::computeLogicalHeight(LayoutUnit logicalHeight, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const
{
computedValues.m_extent = logicalHeight;
computedValues.m_position = logicalTop;
// Cell height is managed by the table and inline non-replaced elements do not support a height property.
if (isInline() && !isReplaced())
return;
Length h;
if (isOutOfFlowPositioned())
computePositionedLogicalHeight(computedValues);
else {
RenderBlock* cb = containingBlock();
// If we are perpendicular to our containing block then we need to resolve our block-start and block-end margins so that if they
// are 'auto' we are centred or aligned within the inline flow containing block: this is done by computing the margins as though they are inline.
// Note that as this is the 'sizing phase' we are using our own writing mode rather than the containing block's. We use the containing block's
// writing mode when figuring out the block-direction margins for positioning in |computeAndSetBlockDirectionMargins| (i.e. margin collapsing etc.).
// See http://www.w3.org/TR/2014/CR-css-writing-modes-3-20140320/#orthogonal-flows
// FIXME(sky): Remove MarginDirection enum.
MarginDirection flowDirection = BlockDirection;
bool treatAsReplaced = shouldComputeSizeAsReplaced();
bool checkMinMaxHeight = false;
// The parent box is flexing us, so it has increased or decreased our height. We have to
// grab our cached flexible height.
// FIXME: Account for block-flow in flexible boxes.
// https://bugs.webkit.org/show_bug.cgi?id=46418
if (hasOverrideHeight() && parent()->isFlexibleBox())
h = Length(overrideLogicalContentHeight(), Fixed);
else if (treatAsReplaced)
h = Length(computeReplacedLogicalHeight(), Fixed);
else {
h = style()->logicalHeight();
checkMinMaxHeight = true;
}
LayoutUnit heightResult;
if (checkMinMaxHeight) {
heightResult = computeLogicalHeightUsing(style()->logicalHeight(), computedValues.m_extent - borderAndPaddingLogicalHeight());
if (heightResult == -1)
heightResult = computedValues.m_extent;
heightResult = constrainLogicalHeightByMinMax(heightResult, computedValues.m_extent - borderAndPaddingLogicalHeight());
} else {
// The only times we don't check min/max height are when a fixed length has
// been given as an override. Just use that. The value has already been adjusted
// for box-sizing.
ASSERT(h.isFixed());
heightResult = h.value() + borderAndPaddingLogicalHeight();
}
computedValues.m_extent = heightResult;
computeMarginsForDirection(flowDirection, cb, containingBlockLogicalWidthForContent(), computedValues.m_extent, computedValues.m_margins.m_before,
computedValues.m_margins.m_after, style()->marginBefore(), style()->marginAfter());
}
}
LayoutUnit RenderBox::computeLogicalHeightUsing(const Length& height, LayoutUnit intrinsicContentHeight) const
{
LayoutUnit logicalHeight = computeContentLogicalHeightUsing(height, intrinsicContentHeight);
if (logicalHeight != -1)
logicalHeight = adjustBorderBoxLogicalHeightForBoxSizing(logicalHeight);
return logicalHeight;
}
LayoutUnit RenderBox::computeContentLogicalHeight(const Length& height, LayoutUnit intrinsicContentHeight) const
{
LayoutUnit heightIncludingScrollbar = computeContentLogicalHeightUsing(height, intrinsicContentHeight);
if (heightIncludingScrollbar == -1)
return -1;
return std::max<LayoutUnit>(0, adjustContentBoxLogicalHeightForBoxSizing(heightIncludingScrollbar));
}
LayoutUnit RenderBox::computeIntrinsicLogicalContentHeightUsing(const Length& logicalHeightLength, LayoutUnit intrinsicContentHeight, LayoutUnit borderAndPadding) const
{
// FIXME(cbiesinger): The css-sizing spec is considering changing what min-content/max-content should resolve to.
// If that happens, this code will have to change.
if (logicalHeightLength.isMinContent() || logicalHeightLength.isMaxContent() || logicalHeightLength.isFitContent()) {
if (isReplaced())
return intrinsicSize().height();
if (m_intrinsicContentLogicalHeight != -1)
return m_intrinsicContentLogicalHeight;
return intrinsicContentHeight;
}
if (logicalHeightLength.isFillAvailable())
return containingBlock()->availableLogicalHeight(ExcludeMarginBorderPadding) - borderAndPadding;
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit RenderBox::computeContentLogicalHeightUsing(const Length& height, LayoutUnit intrinsicContentHeight) const
{
// FIXME(cbiesinger): The css-sizing spec is considering changing what min-content/max-content should resolve to.
// If that happens, this code will have to change.
if (height.isIntrinsic()) {
if (intrinsicContentHeight == -1)
return -1; // Intrinsic height isn't available.
return computeIntrinsicLogicalContentHeightUsing(height, intrinsicContentHeight, borderAndPaddingLogicalHeight());
}
if (height.isFixed())
return height.value();
return -1;
}
// FIXME(sky): Remove
bool RenderBox::skipContainingBlockForPercentHeightCalculation(const RenderBox* containingBlock) const
{
return false;
}
LayoutUnit RenderBox::computeReplacedLogicalWidth(ShouldComputePreferred shouldComputePreferred) const
{
return computeReplacedLogicalWidthRespectingMinMaxWidth(computeReplacedLogicalWidthUsing(style()->logicalWidth()), shouldComputePreferred);
}
LayoutUnit RenderBox::computeReplacedLogicalWidthRespectingMinMaxWidth(LayoutUnit logicalWidth, ShouldComputePreferred shouldComputePreferred) const
{
LayoutUnit minLogicalWidth = (shouldComputePreferred == ComputePreferred && style()->logicalMinWidth().isPercent()) || style()->logicalMinWidth().isMaxSizeNone() ? logicalWidth : computeReplacedLogicalWidthUsing(style()->logicalMinWidth());
LayoutUnit maxLogicalWidth = (shouldComputePreferred == ComputePreferred && style()->logicalMaxWidth().isPercent()) || style()->logicalMaxWidth().isMaxSizeNone() ? logicalWidth : computeReplacedLogicalWidthUsing(style()->logicalMaxWidth());
return std::max(minLogicalWidth, std::min(logicalWidth, maxLogicalWidth));
}
LayoutUnit RenderBox::computeReplacedLogicalWidthUsing(const Length& logicalWidth) const
{
switch (logicalWidth.type()) {
case Fixed:
return adjustContentBoxLogicalWidthForBoxSizing(logicalWidth.value());
case MinContent:
case MaxContent: {
// MinContent/MaxContent don't need the availableLogicalWidth argument.
LayoutUnit availableLogicalWidth = 0;
return computeIntrinsicLogicalWidthUsing(logicalWidth, availableLogicalWidth, borderAndPaddingLogicalWidth()) - borderAndPaddingLogicalWidth();
}
case FitContent:
case FillAvailable:
case Percent:
case Calculated: {
// FIXME: containingBlockLogicalWidthForContent() is wrong if the replaced element's block-flow is perpendicular to the
// containing block's block-flow.
// https://bugs.webkit.org/show_bug.cgi?id=46496
const LayoutUnit cw = isOutOfFlowPositioned() ? containingBlockLogicalWidthForPositioned(toRenderBoxModelObject(container())) : containingBlockLogicalWidthForContent();
Length containerLogicalWidth = containingBlock()->style()->logicalWidth();
// FIXME: Handle cases when containing block width is calculated or viewport percent.
// https://bugs.webkit.org/show_bug.cgi?id=91071
if (logicalWidth.isIntrinsic())
return computeIntrinsicLogicalWidthUsing(logicalWidth, cw, borderAndPaddingLogicalWidth()) - borderAndPaddingLogicalWidth();
if (cw > 0 || (!cw && (containerLogicalWidth.isFixed() || containerLogicalWidth.isPercent())))
return adjustContentBoxLogicalWidthForBoxSizing(minimumValueForLength(logicalWidth, cw));
return 0;
}
case Intrinsic:
case MinIntrinsic:
case Auto:
case MaxSizeNone:
return intrinsicLogicalWidth();
case DeviceWidth:
case DeviceHeight:
break;
}
ASSERT_NOT_REACHED();
return 0;
}
LayoutUnit RenderBox::computeReplacedLogicalHeight() const
{
return computeReplacedLogicalHeightRespectingMinMaxHeight(computeReplacedLogicalHeightUsing(style()->logicalHeight()));
}
bool RenderBox::logicalHeightComputesAsNone(SizeType sizeType) const
{
ASSERT(sizeType == MinSize || sizeType == MaxSize);
Length logicalHeight = sizeType == MinSize ? style()->logicalMinHeight() : style()->logicalMaxHeight();
Length initialLogicalHeight = sizeType == MinSize ? RenderStyle::initialMinSize() : RenderStyle::initialMaxSize();
if (logicalHeight == initialLogicalHeight)
return true;
if (!logicalHeight.isPercent() || isOutOfFlowPositioned())
return false;
return containingBlock()->hasAutoHeightOrContainingBlockWithAutoHeight();
}
LayoutUnit RenderBox::computeReplacedLogicalHeightRespectingMinMaxHeight(LayoutUnit logicalHeight) const
{
// If the height of the containing block is not specified explicitly (i.e., it depends on content height), and this element is not absolutely positioned,
// the percentage value is treated as '0' (for 'min-height') or 'none' (for 'max-height').
LayoutUnit minLogicalHeight;
if (!logicalHeightComputesAsNone(MinSize))
minLogicalHeight = computeReplacedLogicalHeightUsing(style()->logicalMinHeight());
LayoutUnit maxLogicalHeight = logicalHeight;
if (!logicalHeightComputesAsNone(MaxSize))
maxLogicalHeight = computeReplacedLogicalHeightUsing(style()->logicalMaxHeight());
return std::max(minLogicalHeight, std::min(logicalHeight, maxLogicalHeight));
}
LayoutUnit RenderBox::computeReplacedLogicalHeightUsing(const Length& logicalHeight) const
{
switch (logicalHeight.type()) {
case Fixed:
return adjustContentBoxLogicalHeightForBoxSizing(logicalHeight.value());
case Percent:
case Calculated:
{
RenderObject* cb = isOutOfFlowPositioned() ? container() : containingBlock();
if (cb->isRenderBlock())
toRenderBlock(cb)->addPercentHeightDescendant(const_cast<RenderBox*>(this));
// FIXME: This calculation is not patched for block-flow yet.
// https://bugs.webkit.org/show_bug.cgi?id=46500
if (cb->isOutOfFlowPositioned() && cb->style()->height().isAuto() && !(cb->style()->top().isAuto() || cb->style()->bottom().isAuto())) {
ASSERT_WITH_SECURITY_IMPLICATION(cb->isRenderBlock());
RenderBlock* block = toRenderBlock(cb);
LogicalExtentComputedValues computedValues;
block->computeLogicalHeight(block->logicalHeight(), 0, computedValues);
LayoutUnit newContentHeight = computedValues.m_extent - block->borderAndPaddingLogicalHeight();
LayoutUnit newHeight = block->adjustContentBoxLogicalHeightForBoxSizing(newContentHeight);
return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(logicalHeight, newHeight));
}
// FIXME: availableLogicalHeight() is wrong if the replaced element's block-flow is perpendicular to the
// containing block's block-flow.
// https://bugs.webkit.org/show_bug.cgi?id=46496
LayoutUnit availableHeight;
if (isOutOfFlowPositioned())
availableHeight = containingBlockLogicalHeightForPositioned(toRenderBoxModelObject(cb));
else {
availableHeight = containingBlockLogicalHeightForContent(IncludeMarginBorderPadding);
// It is necessary to use the border-box to match WinIE's broken
// box model. This is essential for sizing inside
// table cells using percentage heights.
// FIXME: This needs to be made block-flow-aware. If the cell and image are perpendicular block-flows, this isn't right.
// https://bugs.webkit.org/show_bug.cgi?id=46997
while (cb && !cb->isRenderView() && (cb->style()->logicalHeight().isAuto() || cb->style()->logicalHeight().isPercent())) {
toRenderBlock(cb)->addPercentHeightDescendant(const_cast<RenderBox*>(this));
cb = cb->containingBlock();
}
}
return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(logicalHeight, availableHeight));
}
case MinContent:
case MaxContent:
case FitContent:
case FillAvailable:
return adjustContentBoxLogicalHeightForBoxSizing(computeIntrinsicLogicalContentHeightUsing(logicalHeight, intrinsicLogicalHeight(), borderAndPaddingHeight()));
default:
return intrinsicLogicalHeight();
}
}
LayoutUnit RenderBox::availableLogicalHeight(AvailableLogicalHeightType heightType) const
{
// http://www.w3.org/TR/CSS2/visudet.html#propdef-height - We are interested in the content height.
return constrainContentBoxLogicalHeightByMinMax(availableLogicalHeightUsing(style()->logicalHeight(), heightType), -1);
}
LayoutUnit RenderBox::availableLogicalHeightUsing(const Length& h, AvailableLogicalHeightType heightType) const
{
if (isRenderView()) {
ASSERT_NOT_REACHED();
return LayoutUnit();
}
if (h.isPercent() && isOutOfFlowPositioned()) {
// FIXME: This is wrong if the containingBlock has a perpendicular writing mode.
LayoutUnit availableHeight = containingBlockLogicalHeightForPositioned(containingBlock());
return adjustContentBoxLogicalHeightForBoxSizing(valueForLength(h, availableHeight));
}
LayoutUnit heightIncludingScrollbar = computeContentLogicalHeightUsing(h, -1);
if (heightIncludingScrollbar != -1)
return std::max<LayoutUnit>(0, adjustContentBoxLogicalHeightForBoxSizing(heightIncludingScrollbar));
// FIXME: Check logicalTop/logicalBottom here to correctly handle vertical writing-mode.
// https://bugs.webkit.org/show_bug.cgi?id=46500
if (isRenderBlock() && isOutOfFlowPositioned() && style()->height().isAuto() && !(style()->top().isAuto() || style()->bottom().isAuto())) {
RenderBlock* block = const_cast<RenderBlock*>(toRenderBlock(this));
LogicalExtentComputedValues computedValues;
block->computeLogicalHeight(block->logicalHeight(), 0, computedValues);
LayoutUnit newContentHeight = computedValues.m_extent - block->borderAndPaddingLogicalHeight();
return adjustContentBoxLogicalHeightForBoxSizing(newContentHeight);
}
// FIXME: This is wrong if the containingBlock has a perpendicular writing mode.
LayoutUnit availableHeight = containingBlockLogicalHeightForContent(heightType);
if (heightType == ExcludeMarginBorderPadding) {
// FIXME: Margin collapsing hasn't happened yet, so this incorrectly removes collapsed margins.
availableHeight -= marginBefore() + marginAfter() + borderAndPaddingLogicalHeight();
}
return availableHeight;
}
void RenderBox::computeAndSetBlockDirectionMargins(const RenderBlock* containingBlock)
{
LayoutUnit marginBefore;
LayoutUnit marginAfter;
computeMarginsForDirection(BlockDirection, containingBlock, containingBlockLogicalWidthForContent(), logicalHeight(), marginBefore, marginAfter,
style()->marginBeforeUsing(containingBlock->style()),
style()->marginAfterUsing(containingBlock->style()));
// Note that in this 'positioning phase' of the layout we are using the containing block's writing mode rather than our own when calculating margins.
// See http://www.w3.org/TR/2014/CR-css-writing-modes-3-20140320/#orthogonal-flows
containingBlock->setMarginBeforeForChild(this, marginBefore);
containingBlock->setMarginAfterForChild(this, marginAfter);
}
LayoutUnit RenderBox::containingBlockLogicalWidthForPositioned(const RenderBoxModelObject* containingBlock) const
{
ASSERT(containingBlock->isBox());
return toRenderBox(containingBlock)->clientLogicalWidth();
}
LayoutUnit RenderBox::containingBlockLogicalHeightForPositioned(const RenderBoxModelObject* containingBlock) const
{
ASSERT(containingBlock->isBox());
const RenderBlock* cb = containingBlock->isRenderBlock() ?
toRenderBlock(containingBlock) : containingBlock->containingBlock();
return cb->clientLogicalHeight();
}
static void computePositionedStaticDistance(Length& leftOrTop, Length& rightOrBottom)
{
if (!leftOrTop.isAuto() || !rightOrBottom.isAuto())
return;
leftOrTop.setValue(Fixed, 0);
}
void RenderBox::computePositionedLogicalWidth(LogicalExtentComputedValues& computedValues) const
{
if (isReplaced()) {
computePositionedLogicalWidthReplaced(computedValues);
return;
}
// QUESTIONS
// FIXME 1: Should we still deal with these the cases of 'left' or 'right' having
// the type 'static' in determining whether to calculate the static distance?
// NOTE: 'static' is not a legal value for 'left' or 'right' as of CSS 2.1.
// FIXME 2: Can perhaps optimize out cases when max-width/min-width are greater
// than or less than the computed width(). Be careful of box-sizing and
// percentage issues.
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.3.7 "Absolutely positioned, non-replaced elements"
// <http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width>
// (block-style-comments in this function and in computePositionedLogicalWidthUsing()
// correspond to text from the spec)
// We don't use containingBlock(), since we may be positioned by an enclosing
// relative positioned inline.
const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
const LayoutUnit containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
// Use the container block's direction except when calculating the static distance
// This conforms with the reference results for abspos-replaced-width-margin-000.htm
// of the CSS 2.1 test suite
TextDirection containerDirection = containerBlock->style()->direction();
const LayoutUnit bordersPlusPadding = borderAndPaddingLogicalWidth();
const Length marginLogicalLeft = style()->marginLeft();
const Length marginLogicalRight = style()->marginRight();
Length logicalLeftLength = style()->logicalLeft();
Length logicalRightLength = style()->logicalRight();
/*---------------------------------------------------------------------------*\
* For the purposes of this section and the next, the term "static position"
* (of an element) refers, roughly, to the position an element would have had
* in the normal flow. More precisely:
*
* * The static position for 'left' is the distance from the left edge of the
* containing block to the left margin edge of a hypothetical box that would
* have been the first box of the element if its 'position' property had
* been 'static' and 'float' had been 'none'. The value is negative if the
* hypothetical box is to the left of the containing block.
* * The static position for 'right' is the distance from the right edge of the
* containing block to the right margin edge of the same hypothetical box as
* above. The value is positive if the hypothetical box is to the left of the
* containing block's edge.
*
* But rather than actually calculating the dimensions of that hypothetical box,
* user agents are free to make a guess at its probable position.
*
* For the purposes of calculating the static position, the containing block of
* fixed positioned elements is the initial containing block instead of the
* viewport, and all scrollable boxes should be assumed to be scrolled to their
* origin.
\*---------------------------------------------------------------------------*/
// see FIXME 1
// Calculate the static distance if needed.
computePositionedStaticDistance(logicalLeftLength, logicalRightLength);
// Calculate constraint equation values for 'width' case.
computePositionedLogicalWidthUsing(style()->logicalWidth(), containerBlock, containerDirection,
containerLogicalWidth, bordersPlusPadding,
logicalLeftLength, logicalRightLength, marginLogicalLeft, marginLogicalRight,
computedValues);
// Calculate constraint equation values for 'max-width' case.
if (!style()->logicalMaxWidth().isMaxSizeNone()) {
LogicalExtentComputedValues maxValues;
computePositionedLogicalWidthUsing(style()->logicalMaxWidth(), containerBlock, containerDirection,
containerLogicalWidth, bordersPlusPadding,
logicalLeftLength, logicalRightLength, marginLogicalLeft, marginLogicalRight,
maxValues);
if (computedValues.m_extent > maxValues.m_extent) {
computedValues.m_extent = maxValues.m_extent;
computedValues.m_position = maxValues.m_position;
computedValues.m_margins.m_start = maxValues.m_margins.m_start;
computedValues.m_margins.m_end = maxValues.m_margins.m_end;
}
}
// Calculate constraint equation values for 'min-width' case.
if (!style()->logicalMinWidth().isZero() || style()->logicalMinWidth().isIntrinsic()) {
LogicalExtentComputedValues minValues;
computePositionedLogicalWidthUsing(style()->logicalMinWidth(), containerBlock, containerDirection,
containerLogicalWidth, bordersPlusPadding,
logicalLeftLength, logicalRightLength, marginLogicalLeft, marginLogicalRight,
minValues);
if (computedValues.m_extent < minValues.m_extent) {
computedValues.m_extent = minValues.m_extent;
computedValues.m_position = minValues.m_position;
computedValues.m_margins.m_start = minValues.m_margins.m_start;
computedValues.m_margins.m_end = minValues.m_margins.m_end;
}
}
computedValues.m_extent += bordersPlusPadding;
}
static void computeLogicalLeftPositionedOffset(LayoutUnit& logicalLeftPos, const RenderBox* child, LayoutUnit logicalWidthValue, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalWidth)
{
// FIXME(sky): Remove
logicalLeftPos += containerBlock->borderLeft();
}
void RenderBox::shrinkToFitWidth(const LayoutUnit availableSpace, const LayoutUnit logicalLeftValue, const LayoutUnit bordersPlusPadding, LogicalExtentComputedValues& computedValues) const
{
// FIXME: would it be better to have shrink-to-fit in one step?
LayoutUnit preferredWidth = maxPreferredLogicalWidth() - bordersPlusPadding;
LayoutUnit preferredMinWidth = minPreferredLogicalWidth() - bordersPlusPadding;
LayoutUnit availableWidth = availableSpace - logicalLeftValue;
computedValues.m_extent = std::min(std::max(preferredMinWidth, availableWidth), preferredWidth);
}
void RenderBox::computePositionedLogicalWidthUsing(Length logicalWidth, const RenderBoxModelObject* containerBlock, TextDirection containerDirection,
LayoutUnit containerLogicalWidth, LayoutUnit bordersPlusPadding,
const Length& logicalLeft, const Length& logicalRight, const Length& marginLogicalLeft,
const Length& marginLogicalRight, LogicalExtentComputedValues& computedValues) const
{
if (logicalWidth.isIntrinsic())
logicalWidth = Length(computeIntrinsicLogicalWidthUsing(logicalWidth, containerLogicalWidth, bordersPlusPadding) - bordersPlusPadding, Fixed);
// 'left' and 'right' cannot both be 'auto' because one would of been
// converted to the static position already
ASSERT(!(logicalLeft.isAuto() && logicalRight.isAuto()));
LayoutUnit logicalLeftValue = 0;
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
bool logicalWidthIsAuto = logicalWidth.isIntrinsicOrAuto();
bool logicalLeftIsAuto = logicalLeft.isAuto();
bool logicalRightIsAuto = logicalRight.isAuto();
LayoutUnit& marginLogicalLeftValue = style()->isLeftToRightDirection() ? computedValues.m_margins.m_start : computedValues.m_margins.m_end;
LayoutUnit& marginLogicalRightValue = style()->isLeftToRightDirection() ? computedValues.m_margins.m_end : computedValues.m_margins.m_start;
if (!logicalLeftIsAuto && !logicalWidthIsAuto && !logicalRightIsAuto) {
/*-----------------------------------------------------------------------*\
* If none of the three is 'auto': If both 'margin-left' and 'margin-
* right' are 'auto', solve the equation under the extra constraint that
* the two margins get equal values, unless this would make them negative,
* in which case when direction of the containing block is 'ltr' ('rtl'),
* set 'margin-left' ('margin-right') to zero and solve for 'margin-right'
* ('margin-left'). If one of 'margin-left' or 'margin-right' is 'auto',
* solve the equation for that value. If the values are over-constrained,
* ignore the value for 'left' (in case the 'direction' property of the
* containing block is 'rtl') or 'right' (in case 'direction' is 'ltr')
* and solve for that value.
\*-----------------------------------------------------------------------*/
// NOTE: It is not necessary to solve for 'right' in the over constrained
// case because the value is not used for any further calculations.
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
computedValues.m_extent = adjustContentBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, containerLogicalWidth));
const LayoutUnit availableSpace = containerLogicalWidth - (logicalLeftValue + computedValues.m_extent + valueForLength(logicalRight, containerLogicalWidth) + bordersPlusPadding);
// Margins are now the only unknown
if (marginLogicalLeft.isAuto() && marginLogicalRight.isAuto()) {
// Both margins auto, solve for equality
if (availableSpace >= 0) {
marginLogicalLeftValue = availableSpace / 2; // split the difference
marginLogicalRightValue = availableSpace - marginLogicalLeftValue; // account for odd valued differences
} else {
// Use the containing block's direction rather than the parent block's
// per CSS 2.1 reference test abspos-non-replaced-width-margin-000.
if (containerDirection == LTR) {
marginLogicalLeftValue = 0;
marginLogicalRightValue = availableSpace; // will be negative
} else {
marginLogicalLeftValue = availableSpace; // will be negative
marginLogicalRightValue = 0;
}
}
} else if (marginLogicalLeft.isAuto()) {
// Solve for left margin
marginLogicalRightValue = valueForLength(marginLogicalRight, containerRelativeLogicalWidth);
marginLogicalLeftValue = availableSpace - marginLogicalRightValue;
} else if (marginLogicalRight.isAuto()) {
// Solve for right margin
marginLogicalLeftValue = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
marginLogicalRightValue = availableSpace - marginLogicalLeftValue;
} else {
// Over-constrained, solve for left if direction is RTL
marginLogicalLeftValue = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
marginLogicalRightValue = valueForLength(marginLogicalRight, containerRelativeLogicalWidth);
// Use the containing block's direction rather than the parent block's
// per CSS 2.1 reference test abspos-non-replaced-width-margin-000.
if (containerDirection == RTL)
logicalLeftValue = (availableSpace + logicalLeftValue) - marginLogicalLeftValue - marginLogicalRightValue;
}
} else {
/*--------------------------------------------------------------------*\
* Otherwise, set 'auto' values for 'margin-left' and 'margin-right'
* to 0, and pick the one of the following six rules that applies.
*
* 1. 'left' and 'width' are 'auto' and 'right' is not 'auto', then the
* width is shrink-to-fit. Then solve for 'left'
*
* OMIT RULE 2 AS IT SHOULD NEVER BE HIT
* ------------------------------------------------------------------
* 2. 'left' and 'right' are 'auto' and 'width' is not 'auto', then if
* the 'direction' property of the containing block is 'ltr' set
* 'left' to the static position, otherwise set 'right' to the
* static position. Then solve for 'left' (if 'direction is 'rtl')
* or 'right' (if 'direction' is 'ltr').
* ------------------------------------------------------------------
*
* 3. 'width' and 'right' are 'auto' and 'left' is not 'auto', then the
* width is shrink-to-fit . Then solve for 'right'
* 4. 'left' is 'auto', 'width' and 'right' are not 'auto', then solve
* for 'left'
* 5. 'width' is 'auto', 'left' and 'right' are not 'auto', then solve
* for 'width'
* 6. 'right' is 'auto', 'left' and 'width' are not 'auto', then solve
* for 'right'
*
* Calculation of the shrink-to-fit width is similar to calculating the
* width of a table cell using the automatic table layout algorithm.
* Roughly: calculate the preferred width by formatting the content
* without breaking lines other than where explicit line breaks occur,
* and also calculate the preferred minimum width, e.g., by trying all
* possible line breaks. CSS 2.1 does not define the exact algorithm.
* Thirdly, calculate the available width: this is found by solving
* for 'width' after setting 'left' (in case 1) or 'right' (in case 3)
* to 0.
*
* Then the shrink-to-fit width is:
* min(max(preferred minimum width, available width), preferred width).
\*--------------------------------------------------------------------*/
// NOTE: For rules 3 and 6 it is not necessary to solve for 'right'
// because the value is not used for any further calculations.
// Calculate margins, 'auto' margins are ignored.
marginLogicalLeftValue = minimumValueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
marginLogicalRightValue = minimumValueForLength(marginLogicalRight, containerRelativeLogicalWidth);
const LayoutUnit availableSpace = containerLogicalWidth - (marginLogicalLeftValue + marginLogicalRightValue + bordersPlusPadding);
// FIXME: Is there a faster way to find the correct case?
// Use rule/case that applies.
if (logicalLeftIsAuto && logicalWidthIsAuto && !logicalRightIsAuto) {
// RULE 1: (use shrink-to-fit for width, and solve of left)
LayoutUnit logicalRightValue = valueForLength(logicalRight, containerLogicalWidth);
// FIXME: would it be better to have shrink-to-fit in one step?
LayoutUnit preferredWidth = maxPreferredLogicalWidth() - bordersPlusPadding;
LayoutUnit preferredMinWidth = minPreferredLogicalWidth() - bordersPlusPadding;
LayoutUnit availableWidth = availableSpace - logicalRightValue;
computedValues.m_extent = std::min(std::max(preferredMinWidth, availableWidth), preferredWidth);
logicalLeftValue = availableSpace - (computedValues.m_extent + logicalRightValue);
} else if (!logicalLeftIsAuto && logicalWidthIsAuto && logicalRightIsAuto) {
// RULE 3: (use shrink-to-fit for width, and no need solve of right)
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
shrinkToFitWidth(availableSpace, logicalLeftValue, bordersPlusPadding, computedValues);
} else if (logicalLeftIsAuto && !logicalWidthIsAuto && !logicalRightIsAuto) {
// RULE 4: (solve for left)
computedValues.m_extent = adjustContentBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, containerLogicalWidth));
logicalLeftValue = availableSpace - (computedValues.m_extent + valueForLength(logicalRight, containerLogicalWidth));
} else if (!logicalLeftIsAuto && logicalWidthIsAuto && !logicalRightIsAuto) {
// RULE 5: (solve for width)
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
computedValues.m_extent = availableSpace - (logicalLeftValue + valueForLength(logicalRight, containerLogicalWidth));
} else if (!logicalLeftIsAuto && !logicalWidthIsAuto && logicalRightIsAuto) {
// RULE 6: (no need solve for right)
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
computedValues.m_extent = adjustContentBoxLogicalWidthForBoxSizing(valueForLength(logicalWidth, containerLogicalWidth));
}
}
// Use computed values to calculate the horizontal position.
// FIXME: This hack is needed to calculate the logical left position for a 'rtl' relatively
// positioned, inline because right now, it is using the logical left position
// of the first line box when really it should use the last line box. When
// this is fixed elsewhere, this block should be removed.
if (containerBlock->isRenderInline() && !containerBlock->style()->isLeftToRightDirection()) {
const RenderInline* flow = toRenderInline(containerBlock);
InlineFlowBox* firstLine = flow->firstLineBox();
InlineFlowBox* lastLine = flow->lastLineBox();
if (firstLine && lastLine && firstLine != lastLine) {
computedValues.m_position = logicalLeftValue + marginLogicalLeftValue + lastLine->borderLogicalLeft() + (lastLine->logicalLeft() - firstLine->logicalLeft());
return;
}
}
computedValues.m_position = logicalLeftValue + marginLogicalLeftValue;
computeLogicalLeftPositionedOffset(computedValues.m_position, this, computedValues.m_extent, containerBlock, containerLogicalWidth);
}
void RenderBox::computePositionedLogicalHeight(LogicalExtentComputedValues& computedValues) const
{
if (isReplaced()) {
computePositionedLogicalHeightReplaced(computedValues);
return;
}
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.6.4 "Absolutely positioned, non-replaced elements"
// <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-non-replaced-height>
// (block-style-comments in this function and in computePositionedLogicalHeightUsing()
// correspond to text from the spec)
// We don't use containingBlock(), since we may be positioned by an enclosing relpositioned inline.
const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
const LayoutUnit containerLogicalHeight = containingBlockLogicalHeightForPositioned(containerBlock);
RenderStyle* styleToUse = style();
const LayoutUnit bordersPlusPadding = borderAndPaddingLogicalHeight();
const Length marginBefore = styleToUse->marginBefore();
const Length marginAfter = styleToUse->marginAfter();
Length logicalTopLength = styleToUse->logicalTop();
Length logicalBottomLength = styleToUse->logicalBottom();
/*---------------------------------------------------------------------------*\
* For the purposes of this section and the next, the term "static position"
* (of an element) refers, roughly, to the position an element would have had
* in the normal flow. More precisely, the static position for 'top' is the
* distance from the top edge of the containing block to the top margin edge
* of a hypothetical box that would have been the first box of the element if
* its 'position' property had been 'static' and 'float' had been 'none'. The
* value is negative if the hypothetical box is above the containing block.
*
* But rather than actually calculating the dimensions of that hypothetical
* box, user agents are free to make a guess at its probable position.
*
* For the purposes of calculating the static position, the containing block
* of fixed positioned elements is the initial containing block instead of
* the viewport.
\*---------------------------------------------------------------------------*/
// see FIXME 1
// Calculate the static distance if needed.
computePositionedStaticDistance(logicalTopLength, logicalBottomLength);
// Calculate constraint equation values for 'height' case.
LayoutUnit logicalHeight = computedValues.m_extent;
computePositionedLogicalHeightUsing(styleToUse->logicalHeight(), containerBlock, containerLogicalHeight, bordersPlusPadding, logicalHeight,
logicalTopLength, logicalBottomLength, marginBefore, marginAfter,
computedValues);
// Avoid doing any work in the common case (where the values of min-height and max-height are their defaults).
// see FIXME 2
// Calculate constraint equation values for 'max-height' case.
if (!styleToUse->logicalMaxHeight().isMaxSizeNone()) {
LogicalExtentComputedValues maxValues;
computePositionedLogicalHeightUsing(styleToUse->logicalMaxHeight(), containerBlock, containerLogicalHeight, bordersPlusPadding, logicalHeight,
logicalTopLength, logicalBottomLength, marginBefore, marginAfter,
maxValues);
if (computedValues.m_extent > maxValues.m_extent) {
computedValues.m_extent = maxValues.m_extent;
computedValues.m_position = maxValues.m_position;
computedValues.m_margins.m_before = maxValues.m_margins.m_before;
computedValues.m_margins.m_after = maxValues.m_margins.m_after;
}
}
// Calculate constraint equation values for 'min-height' case.
if (!styleToUse->logicalMinHeight().isZero() || styleToUse->logicalMinHeight().isIntrinsic()) {
LogicalExtentComputedValues minValues;
computePositionedLogicalHeightUsing(styleToUse->logicalMinHeight(), containerBlock, containerLogicalHeight, bordersPlusPadding, logicalHeight,
logicalTopLength, logicalBottomLength, marginBefore, marginAfter,
minValues);
if (computedValues.m_extent < minValues.m_extent) {
computedValues.m_extent = minValues.m_extent;
computedValues.m_position = minValues.m_position;
computedValues.m_margins.m_before = minValues.m_margins.m_before;
computedValues.m_margins.m_after = minValues.m_margins.m_after;
}
}
// Set final height value.
computedValues.m_extent += bordersPlusPadding;
}
static void computeLogicalTopPositionedOffset(LayoutUnit& logicalTopPos, const RenderBox* child, LayoutUnit logicalHeightValue, const RenderBoxModelObject* containerBlock, LayoutUnit containerLogicalHeight)
{
// FIXME(sky): Remove
logicalTopPos += containerBlock->borderTop();
}
void RenderBox::computePositionedLogicalHeightUsing(Length logicalHeightLength, const RenderBoxModelObject* containerBlock,
LayoutUnit containerLogicalHeight, LayoutUnit bordersPlusPadding, LayoutUnit logicalHeight,
const Length& logicalTop, const Length& logicalBottom, const Length& marginBefore,
const Length& marginAfter, LogicalExtentComputedValues& computedValues) const
{
// 'top' and 'bottom' cannot both be 'auto' because 'top would of been
// converted to the static position in computePositionedLogicalHeight()
ASSERT(!(logicalTop.isAuto() && logicalBottom.isAuto()));
LayoutUnit logicalHeightValue;
LayoutUnit contentLogicalHeight = logicalHeight - bordersPlusPadding;
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
LayoutUnit logicalTopValue = 0;
bool logicalHeightIsAuto = logicalHeightLength.isAuto();
bool logicalTopIsAuto = logicalTop.isAuto();
bool logicalBottomIsAuto = logicalBottom.isAuto();
LayoutUnit resolvedLogicalHeight;
if (logicalHeightLength.isIntrinsic())
resolvedLogicalHeight = computeIntrinsicLogicalContentHeightUsing(logicalHeightLength, contentLogicalHeight, bordersPlusPadding);
else
resolvedLogicalHeight = adjustContentBoxLogicalHeightForBoxSizing(valueForLength(logicalHeightLength, containerLogicalHeight));
if (!logicalTopIsAuto && !logicalHeightIsAuto && !logicalBottomIsAuto) {
/*-----------------------------------------------------------------------*\
* If none of the three are 'auto': If both 'margin-top' and 'margin-
* bottom' are 'auto', solve the equation under the extra constraint that
* the two margins get equal values. If one of 'margin-top' or 'margin-
* bottom' is 'auto', solve the equation for that value. If the values
* are over-constrained, ignore the value for 'bottom' and solve for that
* value.
\*-----------------------------------------------------------------------*/
// NOTE: It is not necessary to solve for 'bottom' in the over constrained
// case because the value is not used for any further calculations.
logicalHeightValue = resolvedLogicalHeight;
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
const LayoutUnit availableSpace = containerLogicalHeight - (logicalTopValue + logicalHeightValue + valueForLength(logicalBottom, containerLogicalHeight) + bordersPlusPadding);
// Margins are now the only unknown
if (marginBefore.isAuto() && marginAfter.isAuto()) {
// Both margins auto, solve for equality
// NOTE: This may result in negative values.
computedValues.m_margins.m_before = availableSpace / 2; // split the difference
computedValues.m_margins.m_after = availableSpace - computedValues.m_margins.m_before; // account for odd valued differences
} else if (marginBefore.isAuto()) {
// Solve for top margin
computedValues.m_margins.m_after = valueForLength(marginAfter, containerRelativeLogicalWidth);
computedValues.m_margins.m_before = availableSpace - computedValues.m_margins.m_after;
} else if (marginAfter.isAuto()) {
// Solve for bottom margin
computedValues.m_margins.m_before = valueForLength(marginBefore, containerRelativeLogicalWidth);
computedValues.m_margins.m_after = availableSpace - computedValues.m_margins.m_before;
} else {
// Over-constrained, (no need solve for bottom)
computedValues.m_margins.m_before = valueForLength(marginBefore, containerRelativeLogicalWidth);
computedValues.m_margins.m_after = valueForLength(marginAfter, containerRelativeLogicalWidth);
}
} else {
/*--------------------------------------------------------------------*\
* Otherwise, set 'auto' values for 'margin-top' and 'margin-bottom'
* to 0, and pick the one of the following six rules that applies.
*
* 1. 'top' and 'height' are 'auto' and 'bottom' is not 'auto', then
* the height is based on the content, and solve for 'top'.
*
* OMIT RULE 2 AS IT SHOULD NEVER BE HIT
* ------------------------------------------------------------------
* 2. 'top' and 'bottom' are 'auto' and 'height' is not 'auto', then
* set 'top' to the static position, and solve for 'bottom'.
* ------------------------------------------------------------------
*
* 3. 'height' and 'bottom' are 'auto' and 'top' is not 'auto', then
* the height is based on the content, and solve for 'bottom'.
* 4. 'top' is 'auto', 'height' and 'bottom' are not 'auto', and
* solve for 'top'.
* 5. 'height' is 'auto', 'top' and 'bottom' are not 'auto', and
* solve for 'height'.
* 6. 'bottom' is 'auto', 'top' and 'height' are not 'auto', and
* solve for 'bottom'.
\*--------------------------------------------------------------------*/
// NOTE: For rules 3 and 6 it is not necessary to solve for 'bottom'
// because the value is not used for any further calculations.
// Calculate margins, 'auto' margins are ignored.
computedValues.m_margins.m_before = minimumValueForLength(marginBefore, containerRelativeLogicalWidth);
computedValues.m_margins.m_after = minimumValueForLength(marginAfter, containerRelativeLogicalWidth);
const LayoutUnit availableSpace = containerLogicalHeight - (computedValues.m_margins.m_before + computedValues.m_margins.m_after + bordersPlusPadding);
// Use rule/case that applies.
if (logicalTopIsAuto && logicalHeightIsAuto && !logicalBottomIsAuto) {
// RULE 1: (height is content based, solve of top)
logicalHeightValue = contentLogicalHeight;
logicalTopValue = availableSpace - (logicalHeightValue + valueForLength(logicalBottom, containerLogicalHeight));
} else if (!logicalTopIsAuto && logicalHeightIsAuto && logicalBottomIsAuto) {
// RULE 3: (height is content based, no need solve of bottom)
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalHeightValue = contentLogicalHeight;
} else if (logicalTopIsAuto && !logicalHeightIsAuto && !logicalBottomIsAuto) {
// RULE 4: (solve of top)
logicalHeightValue = resolvedLogicalHeight;
logicalTopValue = availableSpace - (logicalHeightValue + valueForLength(logicalBottom, containerLogicalHeight));
} else if (!logicalTopIsAuto && logicalHeightIsAuto && !logicalBottomIsAuto) {
// RULE 5: (solve of height)
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalHeightValue = std::max<LayoutUnit>(0, availableSpace - (logicalTopValue + valueForLength(logicalBottom, containerLogicalHeight)));
} else if (!logicalTopIsAuto && !logicalHeightIsAuto && logicalBottomIsAuto) {
// RULE 6: (no need solve of bottom)
logicalHeightValue = resolvedLogicalHeight;
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
}
}
computedValues.m_extent = logicalHeightValue;
// Use computed values to calculate the vertical position.
computedValues.m_position = logicalTopValue + computedValues.m_margins.m_before;
computeLogicalTopPositionedOffset(computedValues.m_position, this, logicalHeightValue, containerBlock, containerLogicalHeight);
}
void RenderBox::computePositionedLogicalWidthReplaced(LogicalExtentComputedValues& computedValues) const
{
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.3.8 "Absolutely positioned, replaced elements"
// <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-width>
// (block-style-comments in this function correspond to text from the spec and
// the numbers correspond to numbers in spec)
// We don't use containingBlock(), since we may be positioned by an enclosing
// relative positioned inline.
const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
const LayoutUnit containerLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
// To match WinIE, in quirks mode use the parent's 'direction' property
// instead of the the container block's.
TextDirection containerDirection = containerBlock->style()->direction();
// Variables to solve.
Length logicalLeft = style()->logicalLeft();
Length logicalRight = style()->logicalRight();
Length marginLogicalLeft = style()->marginLeft();
Length marginLogicalRight = style()->marginRight();
LayoutUnit& marginLogicalLeftAlias = style()->isLeftToRightDirection() ? computedValues.m_margins.m_start : computedValues.m_margins.m_end;
LayoutUnit& marginLogicalRightAlias = style()->isLeftToRightDirection() ? computedValues.m_margins.m_end : computedValues.m_margins.m_start;
/*-----------------------------------------------------------------------*\
* 1. The used value of 'width' is determined as for inline replaced
* elements.
\*-----------------------------------------------------------------------*/
// NOTE: This value of width is final in that the min/max width calculations
// are dealt with in computeReplacedWidth(). This means that the steps to produce
// correct max/min in the non-replaced version, are not necessary.
computedValues.m_extent = computeReplacedLogicalWidth() + borderAndPaddingLogicalWidth();
const LayoutUnit availableSpace = containerLogicalWidth - computedValues.m_extent;
/*-----------------------------------------------------------------------*\
* 2. If both 'left' and 'right' have the value 'auto', then if 'direction'
* of the containing block is 'ltr', set 'left' to the static position;
* else if 'direction' is 'rtl', set 'right' to the static position.
\*-----------------------------------------------------------------------*/
// see FIXME 1
computePositionedStaticDistance(logicalLeft, logicalRight);
/*-----------------------------------------------------------------------*\
* 3. If 'left' or 'right' are 'auto', replace any 'auto' on 'margin-left'
* or 'margin-right' with '0'.
\*-----------------------------------------------------------------------*/
if (logicalLeft.isAuto() || logicalRight.isAuto()) {
if (marginLogicalLeft.isAuto())
marginLogicalLeft.setValue(Fixed, 0);
if (marginLogicalRight.isAuto())
marginLogicalRight.setValue(Fixed, 0);
}
/*-----------------------------------------------------------------------*\
* 4. If at this point both 'margin-left' and 'margin-right' are still
* 'auto', solve the equation under the extra constraint that the two
* margins must get equal values, unless this would make them negative,
* in which case when the direction of the containing block is 'ltr'
* ('rtl'), set 'margin-left' ('margin-right') to zero and solve for
* 'margin-right' ('margin-left').
\*-----------------------------------------------------------------------*/
LayoutUnit logicalLeftValue = 0;
LayoutUnit logicalRightValue = 0;
if (marginLogicalLeft.isAuto() && marginLogicalRight.isAuto()) {
// 'left' and 'right' cannot be 'auto' due to step 3
ASSERT(!(logicalLeft.isAuto() && logicalRight.isAuto()));
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth);
LayoutUnit difference = availableSpace - (logicalLeftValue + logicalRightValue);
if (difference > 0) {
marginLogicalLeftAlias = difference / 2; // split the difference
marginLogicalRightAlias = difference - marginLogicalLeftAlias; // account for odd valued differences
} else {
// Use the containing block's direction rather than the parent block's
// per CSS 2.1 reference test abspos-replaced-width-margin-000.
if (containerDirection == LTR) {
marginLogicalLeftAlias = 0;
marginLogicalRightAlias = difference; // will be negative
} else {
marginLogicalLeftAlias = difference; // will be negative
marginLogicalRightAlias = 0;
}
}
/*-----------------------------------------------------------------------*\
* 5. If at this point there is an 'auto' left, solve the equation for
* that value.
\*-----------------------------------------------------------------------*/
} else if (logicalLeft.isAuto()) {
marginLogicalLeftAlias = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
marginLogicalRightAlias = valueForLength(marginLogicalRight, containerRelativeLogicalWidth);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth);
// Solve for 'left'
logicalLeftValue = availableSpace - (logicalRightValue + marginLogicalLeftAlias + marginLogicalRightAlias);
} else if (logicalRight.isAuto()) {
marginLogicalLeftAlias = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
marginLogicalRightAlias = valueForLength(marginLogicalRight, containerRelativeLogicalWidth);
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
// Solve for 'right'
logicalRightValue = availableSpace - (logicalLeftValue + marginLogicalLeftAlias + marginLogicalRightAlias);
} else if (marginLogicalLeft.isAuto()) {
marginLogicalRightAlias = valueForLength(marginLogicalRight, containerRelativeLogicalWidth);
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth);
// Solve for 'margin-left'
marginLogicalLeftAlias = availableSpace - (logicalLeftValue + logicalRightValue + marginLogicalRightAlias);
} else if (marginLogicalRight.isAuto()) {
marginLogicalLeftAlias = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth);
// Solve for 'margin-right'
marginLogicalRightAlias = availableSpace - (logicalLeftValue + logicalRightValue + marginLogicalLeftAlias);
} else {
// Nothing is 'auto', just calculate the values.
marginLogicalLeftAlias = valueForLength(marginLogicalLeft, containerRelativeLogicalWidth);
marginLogicalRightAlias = valueForLength(marginLogicalRight, containerRelativeLogicalWidth);
logicalRightValue = valueForLength(logicalRight, containerLogicalWidth);
logicalLeftValue = valueForLength(logicalLeft, containerLogicalWidth);
// If the containing block is right-to-left, then push the left position as far to the right as possible
if (containerDirection == RTL) {
int totalLogicalWidth = computedValues.m_extent + logicalLeftValue + logicalRightValue + marginLogicalLeftAlias + marginLogicalRightAlias;
logicalLeftValue = containerLogicalWidth - (totalLogicalWidth - logicalLeftValue);
}
}
/*-----------------------------------------------------------------------*\
* 6. If at this point the values are over-constrained, ignore the value
* for either 'left' (in case the 'direction' property of the
* containing block is 'rtl') or 'right' (in case 'direction' is
* 'ltr') and solve for that value.
\*-----------------------------------------------------------------------*/
// NOTE: Constraints imposed by the width of the containing block and its content have already been accounted for above.
// FIXME: Deal with differing writing modes here. Our offset needs to be in the containing block's coordinate space, so that
// can make the result here rather complicated to compute.
// Use computed values to calculate the horizontal position.
// FIXME: This hack is needed to calculate the logical left position for a 'rtl' relatively
// positioned, inline containing block because right now, it is using the logical left position
// of the first line box when really it should use the last line box. When
// this is fixed elsewhere, this block should be removed.
if (containerBlock->isRenderInline() && !containerBlock->style()->isLeftToRightDirection()) {
const RenderInline* flow = toRenderInline(containerBlock);
InlineFlowBox* firstLine = flow->firstLineBox();
InlineFlowBox* lastLine = flow->lastLineBox();
if (firstLine && lastLine && firstLine != lastLine) {
computedValues.m_position = logicalLeftValue + marginLogicalLeftAlias + lastLine->borderLogicalLeft() + (lastLine->logicalLeft() - firstLine->logicalLeft());
return;
}
}
LayoutUnit logicalLeftPos = logicalLeftValue + marginLogicalLeftAlias;
computeLogicalLeftPositionedOffset(logicalLeftPos, this, computedValues.m_extent, containerBlock, containerLogicalWidth);
computedValues.m_position = logicalLeftPos;
}
void RenderBox::computePositionedLogicalHeightReplaced(LogicalExtentComputedValues& computedValues) const
{
// The following is based off of the W3C Working Draft from April 11, 2006 of
// CSS 2.1: Section 10.6.5 "Absolutely positioned, replaced elements"
// <http://www.w3.org/TR/2005/WD-CSS21-20050613/visudet.html#abs-replaced-height>
// (block-style-comments in this function correspond to text from the spec and
// the numbers correspond to numbers in spec)
// We don't use containingBlock(), since we may be positioned by an enclosing relpositioned inline.
const RenderBoxModelObject* containerBlock = toRenderBoxModelObject(container());
const LayoutUnit containerLogicalHeight = containingBlockLogicalHeightForPositioned(containerBlock);
const LayoutUnit containerRelativeLogicalWidth = containingBlockLogicalWidthForPositioned(containerBlock);
// Variables to solve.
Length marginBefore = style()->marginBefore();
Length marginAfter = style()->marginAfter();
LayoutUnit& marginBeforeAlias = computedValues.m_margins.m_before;
LayoutUnit& marginAfterAlias = computedValues.m_margins.m_after;
Length logicalTop = style()->logicalTop();
Length logicalBottom = style()->logicalBottom();
/*-----------------------------------------------------------------------*\
* 1. The used value of 'height' is determined as for inline replaced
* elements.
\*-----------------------------------------------------------------------*/
// NOTE: This value of height is final in that the min/max height calculations
// are dealt with in computeReplacedHeight(). This means that the steps to produce
// correct max/min in the non-replaced version, are not necessary.
computedValues.m_extent = computeReplacedLogicalHeight() + borderAndPaddingLogicalHeight();
const LayoutUnit availableSpace = containerLogicalHeight - computedValues.m_extent;
/*-----------------------------------------------------------------------*\
* 2. If both 'top' and 'bottom' have the value 'auto', replace 'top'
* with the element's static position.
\*-----------------------------------------------------------------------*/
// see FIXME 1
computePositionedStaticDistance(logicalTop, logicalBottom);
/*-----------------------------------------------------------------------*\
* 3. If 'bottom' is 'auto', replace any 'auto' on 'margin-top' or
* 'margin-bottom' with '0'.
\*-----------------------------------------------------------------------*/
// FIXME: The spec. says that this step should only be taken when bottom is
// auto, but if only top is auto, this makes step 4 impossible.
if (logicalTop.isAuto() || logicalBottom.isAuto()) {
if (marginBefore.isAuto())
marginBefore.setValue(Fixed, 0);
if (marginAfter.isAuto())
marginAfter.setValue(Fixed, 0);
}
/*-----------------------------------------------------------------------*\
* 4. If at this point both 'margin-top' and 'margin-bottom' are still
* 'auto', solve the equation under the extra constraint that the two
* margins must get equal values.
\*-----------------------------------------------------------------------*/
LayoutUnit logicalTopValue = 0;
LayoutUnit logicalBottomValue = 0;
if (marginBefore.isAuto() && marginAfter.isAuto()) {
// 'top' and 'bottom' cannot be 'auto' due to step 2 and 3 combined.
ASSERT(!(logicalTop.isAuto() || logicalBottom.isAuto()));
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight);
LayoutUnit difference = availableSpace - (logicalTopValue + logicalBottomValue);
// NOTE: This may result in negative values.
marginBeforeAlias = difference / 2; // split the difference
marginAfterAlias = difference - marginBeforeAlias; // account for odd valued differences
/*-----------------------------------------------------------------------*\
* 5. If at this point there is only one 'auto' left, solve the equation
* for that value.
\*-----------------------------------------------------------------------*/
} else if (logicalTop.isAuto()) {
marginBeforeAlias = valueForLength(marginBefore, containerRelativeLogicalWidth);
marginAfterAlias = valueForLength(marginAfter, containerRelativeLogicalWidth);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight);
// Solve for 'top'
logicalTopValue = availableSpace - (logicalBottomValue + marginBeforeAlias + marginAfterAlias);
} else if (logicalBottom.isAuto()) {
marginBeforeAlias = valueForLength(marginBefore, containerRelativeLogicalWidth);
marginAfterAlias = valueForLength(marginAfter, containerRelativeLogicalWidth);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
// Solve for 'bottom'
// NOTE: It is not necessary to solve for 'bottom' because we don't ever
// use the value.
} else if (marginBefore.isAuto()) {
marginAfterAlias = valueForLength(marginAfter, containerRelativeLogicalWidth);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight);
// Solve for 'margin-top'
marginBeforeAlias = availableSpace - (logicalTopValue + logicalBottomValue + marginAfterAlias);
} else if (marginAfter.isAuto()) {
marginBeforeAlias = valueForLength(marginBefore, containerRelativeLogicalWidth);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
logicalBottomValue = valueForLength(logicalBottom, containerLogicalHeight);
// Solve for 'margin-bottom'
marginAfterAlias = availableSpace - (logicalTopValue + logicalBottomValue + marginBeforeAlias);
} else {
// Nothing is 'auto', just calculate the values.
marginBeforeAlias = valueForLength(marginBefore, containerRelativeLogicalWidth);
marginAfterAlias = valueForLength(marginAfter, containerRelativeLogicalWidth);
logicalTopValue = valueForLength(logicalTop, containerLogicalHeight);
// NOTE: It is not necessary to solve for 'bottom' because we don't ever
// use the value.
}
/*-----------------------------------------------------------------------*\
* 6. If at this point the values are over-constrained, ignore the value
* for 'bottom' and solve for that value.
\*-----------------------------------------------------------------------*/
// NOTE: It is not necessary to do this step because we don't end up using
// the value of 'bottom' regardless of whether the values are over-constrained
// or not.
// Use computed values to calculate the vertical position.
LayoutUnit logicalTopPos = logicalTopValue + marginBeforeAlias;
computeLogicalTopPositionedOffset(logicalTopPos, this, computedValues.m_extent, containerBlock, containerLogicalHeight);
computedValues.m_position = logicalTopPos;
}
LayoutRect RenderBox::localCaretRect(InlineBox* box, int caretOffset, LayoutUnit* extraWidthToEndOfLine)
{
// VisiblePositions at offsets inside containers either a) refer to the positions before/after
// those containers (tables and select elements) or b) refer to the position inside an empty block.
// They never refer to children.
// FIXME: Paint the carets inside empty blocks differently than the carets before/after elements.
LayoutRect rect(location(), LayoutSize(caretWidth, height()));
bool ltr = box ? box->isLeftToRightDirection() : style()->isLeftToRightDirection();
if ((!caretOffset) ^ ltr)
rect.move(LayoutSize(width() - caretWidth, 0));
if (box) {
RootInlineBox& rootBox = box->root();
LayoutUnit top = rootBox.lineTop();
rect.setY(top);
rect.setHeight(rootBox.lineBottom() - top);
}
// If height of box is smaller than font height, use the latter one,
// otherwise the caret might become invisible.
//
// Also, if the box is not a replaced element, always use the font height.
// This prevents the "big caret" bug described in:
// <rdar://problem/3777804> Deleting all content in a document can result in giant tall-as-window insertion point
//
// FIXME: ignoring :first-line, missing good reason to take care of
LayoutUnit fontHeight = style()->fontMetrics().height();
if (fontHeight > rect.height() || !isReplaced())
rect.setHeight(fontHeight);
if (extraWidthToEndOfLine)
*extraWidthToEndOfLine = x() + width() - rect.maxX();
// Move to local coords
rect.moveBy(-location());
return rect;
}
PositionWithAffinity RenderBox::positionForPoint(const LayoutPoint& point)
{
// no children...return this render object's element, if there is one, and offset 0
RenderObject* firstChild = slowFirstChild();
if (!firstChild)
return createPositionWithAffinity(caretMinOffset(), DOWNSTREAM);
// Pass off to the closest child.
LayoutUnit minDist = LayoutUnit::max();
RenderBox* closestRenderer = 0;
LayoutPoint adjustedPoint = point;
for (RenderObject* renderObject = firstChild; renderObject; renderObject = renderObject->nextSibling()) {
if (!renderObject->slowFirstChild() && !renderObject->isInline() && !renderObject->isRenderParagraph())
continue;
if (!renderObject->isBox())
continue;
RenderBox* renderer = toRenderBox(renderObject);
LayoutUnit top = renderer->borderTop() + renderer->paddingTop() + renderer->y();
LayoutUnit bottom = top + renderer->contentHeight();
LayoutUnit left = renderer->borderLeft() + renderer->paddingLeft() + renderer->x();
LayoutUnit right = left + renderer->contentWidth();
if (point.x() <= right && point.x() >= left && point.y() <= top && point.y() >= bottom)
return renderer->positionForPoint(point - renderer->locationOffset());
// Find the distance from (x, y) to the box. Split the space around the box into 8 pieces
// and use a different compare depending on which piece (x, y) is in.
LayoutPoint cmp;
if (point.x() > right) {
if (point.y() < top)
cmp = LayoutPoint(right, top);
else if (point.y() > bottom)
cmp = LayoutPoint(right, bottom);
else
cmp = LayoutPoint(right, point.y());
} else if (point.x() < left) {
if (point.y() < top)
cmp = LayoutPoint(left, top);
else if (point.y() > bottom)
cmp = LayoutPoint(left, bottom);
else
cmp = LayoutPoint(left, point.y());
} else {
if (point.y() < top)
cmp = LayoutPoint(point.x(), top);
else
cmp = LayoutPoint(point.x(), bottom);
}
LayoutSize difference = cmp - point;
LayoutUnit dist = difference.width() * difference.width() + difference.height() * difference.height();
if (dist < minDist) {
closestRenderer = renderer;
minDist = dist;
}
}
if (closestRenderer)
return closestRenderer->positionForPoint(adjustedPoint - closestRenderer->locationOffset());
return createPositionWithAffinity(caretMinOffset(), DOWNSTREAM);
}
void RenderBox::addVisualEffectOverflow()
{
if (!style()->hasVisualOverflowingEffect())
return;
// Add in the final overflow with shadows, outsets and outline combined.
LayoutRect visualEffectOverflow = borderBoxRect();
visualEffectOverflow.expand(computeVisualEffectOverflowExtent());
addVisualOverflow(visualEffectOverflow);
}
LayoutBoxExtent RenderBox::computeVisualEffectOverflowExtent() const
{
ASSERT(style()->hasVisualOverflowingEffect());
LayoutUnit top;
LayoutUnit right;
LayoutUnit bottom;
LayoutUnit left;
if (style()->boxShadow()) {
style()->getBoxShadowExtent(top, right, bottom, left);
// Box shadow extent's top and left are negative when extend to left and top direction, respectively.
// Negate to make them positive.
top = -top;
left = -left;
}
if (style()->hasOutline()) {
if (style()->outlineStyleIsAuto()) {
// The result focus ring rects are in coordinates of this object's border box.
Vector<IntRect> focusRingRects;
addFocusRingRects(focusRingRects, LayoutPoint(), this);
IntRect rect = unionRect(focusRingRects);
int outlineSize = GraphicsContext::focusRingOutsetExtent(style()->outlineOffset(), style()->outlineWidth());
top = std::max<LayoutUnit>(top, -rect.y() + outlineSize);
right = std::max<LayoutUnit>(right, rect.maxX() - width() + outlineSize);
bottom = std::max<LayoutUnit>(bottom, rect.maxY() - height() + outlineSize);
left = std::max<LayoutUnit>(left, -rect.x() + outlineSize);
} else {
LayoutUnit outlineSize = style()->outlineSize();
top = std::max(top, outlineSize);
right = std::max(right, outlineSize);
bottom = std::max(bottom, outlineSize);
left = std::max(left, outlineSize);
}
}
return LayoutBoxExtent(top, right, bottom, left);
}
void RenderBox::addOverflowFromChild(RenderBox* child, const LayoutSize& delta)
{
// Only propagate layout overflow from the child if the child isn't clipping its overflow. If it is, then
// its overflow is internal to it, and we don't care about it. layoutOverflowRectForPropagation takes care of this
// and just propagates the border box rect instead.
LayoutRect childLayoutOverflowRect = child->layoutOverflowRectForPropagation();
childLayoutOverflowRect.move(delta);
addLayoutOverflow(childLayoutOverflowRect);
// Add in visual overflow from the child. Even if the child clips its overflow, it may still
// have visual overflow of its own set from box shadows or reflections. It is unnecessary to propagate this
// overflow if we are clipping our own overflow.
if (child->hasSelfPaintingLayer())
return;
LayoutRect childVisualOverflowRect = child->visualOverflowRect();
childVisualOverflowRect.move(delta);
addContentsVisualOverflow(childVisualOverflowRect);
}
void RenderBox::addLayoutOverflow(const LayoutRect& rect)
{
LayoutRect clientBox = paddingBoxRect();
if (clientBox.contains(rect) || rect.isEmpty())
return;
// For overflow clip objects, we don't want to propagate overflow into unreachable areas.
LayoutRect overflowRect(rect);
if (hasOverflowClip() || isRenderView()) {
// Overflow is in the block's coordinate space and thus is flipped for horizontal-bt and vertical-rl
// writing modes. At this stage that is actually a simplification, since we can treat horizontal-tb/bt as the same
// and vertical-lr/rl as the same.
bool hasTopOverflow = false;
bool hasLeftOverflow = !style()->isLeftToRightDirection();
if (isFlexibleBox() && style()->isReverseFlexDirection()) {
RenderFlexibleBox* flexibleBox = toRenderFlexibleBox(this);
if (flexibleBox->isHorizontalFlow())
hasLeftOverflow = true;
else
hasTopOverflow = true;
}
if (!hasTopOverflow)
overflowRect.shiftYEdgeTo(std::max(overflowRect.y(), clientBox.y()));
else
overflowRect.shiftMaxYEdgeTo(std::min(overflowRect.maxY(), clientBox.maxY()));
if (!hasLeftOverflow)
overflowRect.shiftXEdgeTo(std::max(overflowRect.x(), clientBox.x()));
else
overflowRect.shiftMaxXEdgeTo(std::min(overflowRect.maxX(), clientBox.maxX()));
// Now re-test with the adjusted rectangle and see if it has become unreachable or fully
// contained.
if (clientBox.contains(overflowRect) || overflowRect.isEmpty())
return;
}
if (!m_overflow)
m_overflow = adoptPtr(new RenderOverflow(clientBox, borderBoxRect()));
m_overflow->addLayoutOverflow(overflowRect);
}
void RenderBox::addVisualOverflow(const LayoutRect& rect)
{
LayoutRect borderBox = borderBoxRect();
if (borderBox.contains(rect) || rect.isEmpty())
return;
if (!m_overflow)
m_overflow = adoptPtr(new RenderOverflow(paddingBoxRect(), borderBox));
m_overflow->addVisualOverflow(rect);
}
void RenderBox::addContentsVisualOverflow(const LayoutRect& rect)
{
if (!hasOverflowClip()) {
addVisualOverflow(rect);
return;
}
if (!m_overflow)
m_overflow = adoptPtr(new RenderOverflow(paddingBoxRect(), borderBoxRect()));
m_overflow->addContentsVisualOverflow(rect);
}
void RenderBox::clearLayoutOverflow()
{
if (!m_overflow)
return;
if (!hasVisualOverflow() && contentsVisualOverflowRect().isEmpty()) {
clearAllOverflows();
return;
}
m_overflow->setLayoutOverflow(paddingBoxRect());
}
LayoutUnit RenderBox::lineHeight(bool /*firstLine*/, LineDirectionMode direction, LinePositionMode /*linePositionMode*/) const
{
if (isReplaced())
return direction == HorizontalLine ? m_marginBox.top() + height() + m_marginBox.bottom() : m_marginBox.right() + width() + m_marginBox.left();
return 0;
}
int RenderBox::baselinePosition(FontBaseline baselineType, bool /*firstLine*/, LineDirectionMode direction, LinePositionMode linePositionMode) const
{
ASSERT(linePositionMode == PositionOnContainingLine);
if (isReplaced()) {
int result = direction == HorizontalLine ? m_marginBox.top() + height() + m_marginBox.bottom() : m_marginBox.right() + width() + m_marginBox.left();
if (baselineType == AlphabeticBaseline)
return result;
return result - result / 2;
}
return 0;
}
RenderLayer* RenderBox::enclosingFloatPaintingLayer() const
{
const RenderObject* curr = this;
while (curr) {
RenderLayer* layer = curr->hasLayer() && curr->isBox() ? toRenderBox(curr)->layer() : 0;
if (layer && layer->isSelfPaintingLayer())
return layer;
curr = curr->parent();
}
return 0;
}
LayoutRect RenderBox::layoutOverflowRectForPropagation() const
{
// Only propagate interior layout overflow if we don't clip it.
LayoutRect rect = borderBoxRect();
rect.expand(LayoutSize(LayoutUnit(), marginAfter()));
if (!hasOverflowClip())
rect.unite(layoutOverflowRect());
if (transform())
rect = transform()->mapRect(rect);
return rect;
}
LayoutUnit RenderBox::offsetLeft() const
{
return adjustedPositionRelativeToOffsetParent(location()).x();
}
LayoutUnit RenderBox::offsetTop() const
{
return adjustedPositionRelativeToOffsetParent(location()).y();
}
bool RenderBox::hasRelativeLogicalHeight() const
{
return style()->logicalHeight().isPercent()
|| style()->logicalMinHeight().isPercent()
|| style()->logicalMaxHeight().isPercent();
}
RenderBox::BoxDecorationData::BoxDecorationData(const RenderStyle& style)
{
backgroundColor = style.resolveColor(style.backgroundColor());
hasBackground = backgroundColor.alpha() || style.hasBackgroundImage();
ASSERT(hasBackground == style.hasBackground());
hasBorder = style.hasBorder();
}
} // namespace blink
Reference in New Issue View Git Blame Copy Permalink