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/*
* Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2007, 2008 Rob Buis <buis@kde.org>
* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Google, Inc. All rights reserved.
* Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
*
* 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 "core/layout/svg/LayoutSVGContainer.h"
#include "core/layout/HitTestResult.h"
#include "core/layout/LayoutAnalyzer.h"
#include "core/layout/svg/SVGLayoutSupport.h"
#include "core/layout/svg/SVGResources.h"
#include "core/layout/svg/SVGResourcesCache.h"
#include "core/paint/SVGContainerPainter.h"
namespace blink {
LayoutSVGContainer::LayoutSVGContainer(SVGElement* node)
: LayoutSVGModelObject(node),
m_objectBoundingBoxValid(false),
m_needsBoundariesUpdate(true),
m_didScreenScaleFactorChange(false),
m_hasNonIsolatedBlendingDescendants(false),
m_hasNonIsolatedBlendingDescendantsDirty(false) {}
LayoutSVGContainer::~LayoutSVGContainer() {}
void LayoutSVGContainer::layout() {
ASSERT(needsLayout());
LayoutAnalyzer::Scope analyzer(*this);
// Update the local transform in subclasses.
SVGTransformChange transformChange = calculateLocalTransform();
m_didScreenScaleFactorChange =
transformChange == SVGTransformChange::Full ||
SVGLayoutSupport::screenScaleFactorChanged(parent());
// When hasRelativeLengths() is false, no descendants have relative lengths
// (hence no one is interested in viewport size changes).
bool layoutSizeChanged =
element()->hasRelativeLengths() &&
SVGLayoutSupport::layoutSizeOfNearestViewportChanged(this);
SVGLayoutSupport::layoutChildren(
firstChild(), false, m_didScreenScaleFactorChange, layoutSizeChanged);
// Invalidate all resources of this client if our layout changed.
if (everHadLayout() && needsLayout())
SVGResourcesCache::clientLayoutChanged(this);
if (m_needsBoundariesUpdate || transformChange != SVGTransformChange::None) {
updateCachedBoundaries();
m_needsBoundariesUpdate = false;
// If our bounds changed, notify the parents.
LayoutSVGModelObject::setNeedsBoundariesUpdate();
}
ASSERT(!m_needsBoundariesUpdate);
clearNeedsLayout();
}
void LayoutSVGContainer::addChild(LayoutObject* child,
LayoutObject* beforeChild) {
LayoutSVGModelObject::addChild(child, beforeChild);
SVGResourcesCache::clientWasAddedToTree(child, child->styleRef());
bool shouldIsolateDescendants =
(child->isBlendingAllowed() && child->style()->hasBlendMode()) ||
child->hasNonIsolatedBlendingDescendants();
if (shouldIsolateDescendants)
descendantIsolationRequirementsChanged(DescendantIsolationRequired);
}
void LayoutSVGContainer::removeChild(LayoutObject* child) {
SVGResourcesCache::clientWillBeRemovedFromTree(child);
LayoutSVGModelObject::removeChild(child);
bool hadNonIsolatedDescendants =
(child->isBlendingAllowed() && child->style()->hasBlendMode()) ||
child->hasNonIsolatedBlendingDescendants();
if (hadNonIsolatedDescendants)
descendantIsolationRequirementsChanged(DescendantIsolationNeedsUpdate);
}
bool LayoutSVGContainer::selfWillPaint() const {
return SVGLayoutSupport::hasFilterResource(*this);
}
void LayoutSVGContainer::styleDidChange(StyleDifference diff,
const ComputedStyle* oldStyle) {
LayoutSVGModelObject::styleDidChange(diff, oldStyle);
bool hadIsolation =
oldStyle && !isSVGHiddenContainer() &&
SVGLayoutSupport::willIsolateBlendingDescendantsForStyle(*oldStyle);
bool willIsolateBlendingDescendants =
SVGLayoutSupport::willIsolateBlendingDescendantsForObject(this);
bool isolationChanged = hadIsolation != willIsolateBlendingDescendants;
if (isolationChanged)
setNeedsPaintPropertyUpdate();
if (!parent() || !isolationChanged)
return;
if (hasNonIsolatedBlendingDescendants()) {
parent()->descendantIsolationRequirementsChanged(
willIsolateBlendingDescendants ? DescendantIsolationNeedsUpdate
: DescendantIsolationRequired);
}
}
bool LayoutSVGContainer::hasNonIsolatedBlendingDescendants() const {
if (m_hasNonIsolatedBlendingDescendantsDirty) {
m_hasNonIsolatedBlendingDescendants =
SVGLayoutSupport::computeHasNonIsolatedBlendingDescendants(this);
m_hasNonIsolatedBlendingDescendantsDirty = false;
}
return m_hasNonIsolatedBlendingDescendants;
}
void LayoutSVGContainer::descendantIsolationRequirementsChanged(
DescendantIsolationState state) {
switch (state) {
case DescendantIsolationRequired:
m_hasNonIsolatedBlendingDescendants = true;
m_hasNonIsolatedBlendingDescendantsDirty = false;
break;
case DescendantIsolationNeedsUpdate:
if (m_hasNonIsolatedBlendingDescendantsDirty)
return;
m_hasNonIsolatedBlendingDescendantsDirty = true;
break;
}
if (SVGLayoutSupport::willIsolateBlendingDescendantsForObject(this)) {
if (RuntimeEnabledFeatures::slimmingPaintInvalidationEnabled())
setNeedsPaintPropertyUpdate();
return;
}
if (parent())
parent()->descendantIsolationRequirementsChanged(state);
}
void LayoutSVGContainer::paint(const PaintInfo& paintInfo,
const LayoutPoint&) const {
SVGContainerPainter(*this).paint(paintInfo);
}
void LayoutSVGContainer::addOutlineRects(
Vector<LayoutRect>& rects,
const LayoutPoint&,
IncludeBlockVisualOverflowOrNot) const {
rects.push_back(LayoutRect(visualRectInLocalSVGCoordinates()));
}
void LayoutSVGContainer::updateCachedBoundaries() {
SVGLayoutSupport::computeContainerBoundingBoxes(
this, m_objectBoundingBox, m_objectBoundingBoxValid, m_strokeBoundingBox,
m_localVisualRect);
if (element())
element()->setNeedsResizeObserverUpdate();
}
bool LayoutSVGContainer::nodeAtFloatPoint(HitTestResult& result,
const FloatPoint& pointInParent,
HitTestAction hitTestAction) {
FloatPoint localPoint;
if (!SVGLayoutSupport::transformToUserSpaceAndCheckClipping(
*this, localToSVGParentTransform(), pointInParent, localPoint))
return false;
for (LayoutObject* child = lastChild(); child;
child = child->previousSibling()) {
if (child->nodeAtFloatPoint(result, localPoint, hitTestAction)) {
const LayoutPoint& localLayoutPoint = LayoutPoint(localPoint);
updateHitTestResult(result, localLayoutPoint);
if (result.addNodeToListBasedTestResult(
child->node(), localLayoutPoint) == StopHitTesting)
return true;
}
}
// pointer-events: bounding-box makes it possible for containers to be direct
// targets.
if (style()->pointerEvents() == EPointerEvents::kBoundingBox) {
// Check for a valid bounding box because it will be invalid for empty
// containers.
if (isObjectBoundingBoxValid() &&
objectBoundingBox().contains(localPoint)) {
const LayoutPoint& localLayoutPoint = LayoutPoint(localPoint);
updateHitTestResult(result, localLayoutPoint);
if (result.addNodeToListBasedTestResult(element(), localLayoutPoint) ==
StopHitTesting)
return true;
}
}
// 16.4: "If there are no graphics elements whose relevant graphics content is
// under the pointer (i.e., there is no target element), the event is not
// dispatched."
return false;
}
SVGTransformChange LayoutSVGContainer::calculateLocalTransform() {
return SVGTransformChange::None;
}
} // namespace blink
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