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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 "third_party/blink/renderer/core/layout/svg/layout_svg_container.h"
#include "third_party/blink/renderer/core/layout/hit_test_result.h"
#include "third_party/blink/renderer/core/layout/layout_analyzer.h"
#include "third_party/blink/renderer/core/layout/svg/svg_layout_support.h"
#include "third_party/blink/renderer/core/layout/svg/svg_resources.h"
#include "third_party/blink/renderer/core/layout/svg/svg_resources_cache.h"
#include "third_party/blink/renderer/core/paint/svg_container_painter.h"
namespace blink {
LayoutSVGContainer::LayoutSVGContainer(SVGElement* node)
: LayoutSVGModelObject(node),
object_bounding_box_valid_(false),
needs_boundaries_update_(true),
did_screen_scale_factor_change_(false),
has_non_isolated_blending_descendants_(false),
has_non_isolated_blending_descendants_dirty_(false) {}
LayoutSVGContainer::~LayoutSVGContainer() = default;
void LayoutSVGContainer::UpdateLayout() {
DCHECK(NeedsLayout());
LayoutAnalyzer::Scope analyzer(*this);
// Update the local transform in subclasses.
SVGTransformChange transform_change = CalculateLocalTransform();
did_screen_scale_factor_change_ =
transform_change == SVGTransformChange::kFull ||
SVGLayoutSupport::ScreenScaleFactorChanged(Parent());
// When hasRelativeLengths() is false, no descendants have relative lengths
// (hence no one is interested in viewport size changes).
bool layout_size_changed =
GetElement()->HasRelativeLengths() &&
SVGLayoutSupport::LayoutSizeOfNearestViewportChanged(this);
SVGLayoutSupport::LayoutChildren(FirstChild(), false,
did_screen_scale_factor_change_,
layout_size_changed);
// Invalidate all resources of this client if our layout changed.
if (EverHadLayout() && NeedsLayout())
SVGResourcesCache::ClientLayoutChanged(*this);
if (needs_boundaries_update_ ||
transform_change != SVGTransformChange::kNone) {
UpdateCachedBoundaries();
needs_boundaries_update_ = false;
// If our bounds changed, notify the parents.
LayoutSVGModelObject::SetNeedsBoundariesUpdate();
}
DCHECK(!needs_boundaries_update_);
ClearNeedsLayout();
}
void LayoutSVGContainer::AddChild(LayoutObject* child,
LayoutObject* before_child) {
LayoutSVGModelObject::AddChild(child, before_child);
SVGResourcesCache::ClientWasAddedToTree(*child, child->StyleRef());
bool should_isolate_descendants =
(child->IsBlendingAllowed() && child->Style()->HasBlendMode()) ||
child->HasNonIsolatedBlendingDescendants();
if (should_isolate_descendants)
DescendantIsolationRequirementsChanged(kDescendantIsolationRequired);
}
void LayoutSVGContainer::RemoveChild(LayoutObject* child) {
SVGResourcesCache::ClientWillBeRemovedFromTree(*child);
LayoutSVGModelObject::RemoveChild(child);
bool had_non_isolated_descendants =
(child->IsBlendingAllowed() && child->Style()->HasBlendMode()) ||
child->HasNonIsolatedBlendingDescendants();
if (had_non_isolated_descendants)
DescendantIsolationRequirementsChanged(kDescendantIsolationNeedsUpdate);
}
bool LayoutSVGContainer::SelfWillPaint() const {
return SVGLayoutSupport::HasFilterResource(*this);
}
void LayoutSVGContainer::StyleDidChange(StyleDifference diff,
const ComputedStyle* old_style) {
LayoutSVGModelObject::StyleDidChange(diff, old_style);
bool had_isolation =
old_style && !IsSVGHiddenContainer() &&
SVGLayoutSupport::WillIsolateBlendingDescendantsForStyle(*old_style);
bool will_isolate_blending_descendants =
SVGLayoutSupport::WillIsolateBlendingDescendantsForObject(this);
bool isolation_changed = had_isolation != will_isolate_blending_descendants;
if (isolation_changed)
SetNeedsPaintPropertyUpdate();
if (!Parent() || !isolation_changed)
return;
if (HasNonIsolatedBlendingDescendants()) {
Parent()->DescendantIsolationRequirementsChanged(
will_isolate_blending_descendants ? kDescendantIsolationNeedsUpdate
: kDescendantIsolationRequired);
}
}
bool LayoutSVGContainer::HasNonIsolatedBlendingDescendants() const {
if (has_non_isolated_blending_descendants_dirty_) {
has_non_isolated_blending_descendants_ =
SVGLayoutSupport::ComputeHasNonIsolatedBlendingDescendants(this);
has_non_isolated_blending_descendants_dirty_ = false;
}
return has_non_isolated_blending_descendants_;
}
void LayoutSVGContainer::DescendantIsolationRequirementsChanged(
DescendantIsolationState state) {
switch (state) {
case kDescendantIsolationRequired:
has_non_isolated_blending_descendants_ = true;
has_non_isolated_blending_descendants_dirty_ = false;
break;
case kDescendantIsolationNeedsUpdate:
if (has_non_isolated_blending_descendants_dirty_)
return;
has_non_isolated_blending_descendants_dirty_ = true;
break;
}
if (SVGLayoutSupport::WillIsolateBlendingDescendantsForObject(this)) {
SetNeedsPaintPropertyUpdate();
return;
}
if (Parent())
Parent()->DescendantIsolationRequirementsChanged(state);
}
void LayoutSVGContainer::Paint(const PaintInfo& paint_info) const {
SVGContainerPainter(*this).Paint(paint_info);
}
void LayoutSVGContainer::UpdateCachedBoundaries() {
SVGLayoutSupport::ComputeContainerBoundingBoxes(
this, object_bounding_box_, object_bounding_box_valid_,
stroke_bounding_box_, local_visual_rect_);
GetElement()->SetNeedsResizeObserverUpdate();
}
bool LayoutSVGContainer::NodeAtFloatPoint(HitTestResult& result,
const FloatPoint& point_in_parent,
HitTestAction hit_test_action) {
FloatPoint local_point;
if (!SVGLayoutSupport::TransformToUserSpaceAndCheckClipping(
*this, LocalToSVGParentTransform(), point_in_parent, local_point))
return false;
for (LayoutObject* child = LastChild(); child;
child = child->PreviousSibling()) {
if (child->NodeAtFloatPoint(result, local_point, hit_test_action)) {
const LayoutPoint& local_layout_point = LayoutPoint(local_point);
UpdateHitTestResult(result, local_layout_point);
HitTestLocation location(local_layout_point);
if (result.AddNodeToListBasedTestResult(child->GetNode(), location) ==
kStopHitTesting)
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(local_point)) {
const LayoutPoint& local_layout_point = LayoutPoint(local_point);
UpdateHitTestResult(result, local_layout_point);
HitTestLocation location(local_layout_point);
if (result.AddNodeToListBasedTestResult(GetElement(), location) ==
kStopHitTesting)
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::kNone;
}
} // namespace blink
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