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/*
* Copyright (C) 2006 Apple Computer, Inc.
* Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) Research In Motion Limited 2010. 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 "core/layout/svg/LayoutSVGBlock.h"
#include "core/layout/LayoutGeometryMap.h"
#include "core/layout/LayoutView.h"
#include "core/layout/svg/LayoutSVGRoot.h"
#include "core/layout/svg/SVGLayoutSupport.h"
#include "core/layout/svg/SVGResourcesCache.h"
#include "core/style/ShadowList.h"
#include "core/svg/SVGElement.h"
#include "platform/geometry/TransformState.h"
namespace blink {
LayoutSVGBlock::LayoutSVGBlock(SVGElement* element)
: LayoutBlockFlow(element) {}
bool LayoutSVGBlock::allowsOverflowClip() const {
// LayoutSVGBlock, used by Layout(SVGText|ForeignObject), is not allowed to
// have overflow clip.
// LayoutBlock assumes a layer to be present when the overflow clip
// functionality is requested. Both Layout(SVGText|ForeignObject) return
// 'NoPaintLayer' on 'layerTypeRequired'.
// Fine for LayoutSVGText.
//
// If we want to support overflow rules for <foreignObject> we can choose
// between two solutions:
// a) make LayoutSVGForeignObject require layers and SVG layer aware
// b) refactor overflow logic out of Layer (as suggested by dhyatt), which is
// a large task
//
// Until this is resolved, disable overflow support. Opera/FF don't support it
// as well at the moment (Feb 2010).
//
// Note: This does NOT affect overflow handling on outer/inner <svg> elements
// - this is handled
// manually by LayoutSVGRoot - which owns the documents enclosing root layer
// and thus works fine.
return false;
}
void LayoutSVGBlock::absoluteRects(Vector<IntRect>&, const LayoutPoint&) const {
// This code path should never be taken for SVG, as we're assuming
// useTransforms=true everywhere, absoluteQuads should be used.
ASSERT_NOT_REACHED();
}
void LayoutSVGBlock::willBeDestroyed() {
SVGResourcesCache::clientDestroyed(this);
LayoutBlockFlow::willBeDestroyed();
}
void LayoutSVGBlock::updateFromStyle() {
LayoutBlockFlow::updateFromStyle();
setFloating(false);
}
void LayoutSVGBlock::styleDidChange(StyleDifference diff,
const ComputedStyle* oldStyle) {
if (diff.needsFullLayout()) {
setNeedsBoundariesUpdate();
if (diff.transformChanged())
setNeedsTransformUpdate();
}
if (isBlendingAllowed()) {
bool hasBlendModeChanged =
(oldStyle && oldStyle->hasBlendMode()) == !style()->hasBlendMode();
if (parent() && hasBlendModeChanged)
parent()->descendantIsolationRequirementsChanged(
style()->hasBlendMode() ? DescendantIsolationRequired
: DescendantIsolationNeedsUpdate);
}
LayoutBlock::styleDidChange(diff, oldStyle);
SVGResourcesCache::clientStyleChanged(this, diff, styleRef());
}
void LayoutSVGBlock::mapLocalToAncestor(const LayoutBoxModelObject* ancestor,
TransformState& transformState,
MapCoordinatesFlags flags) const {
// Convert from local HTML coordinates to local SVG coordinates.
transformState.move(locationOffset());
// Apply other mappings on local SVG coordinates.
SVGLayoutSupport::mapLocalToAncestor(this, ancestor, transformState, flags);
}
void LayoutSVGBlock::mapAncestorToLocal(const LayoutBoxModelObject* ancestor,
TransformState& transformState,
MapCoordinatesFlags flags) const {
if (this == ancestor)
return;
// Map to local SVG coordinates.
SVGLayoutSupport::mapAncestorToLocal(*this, ancestor, transformState, flags);
// Convert from local SVG coordinates to local HTML coordinates.
transformState.move(-locationOffset());
}
const LayoutObject* LayoutSVGBlock::pushMappingToContainer(
const LayoutBoxModelObject* ancestorToStopAt,
LayoutGeometryMap& geometryMap) const {
// Convert from local HTML coordinates to local SVG coordinates.
geometryMap.push(this, locationOffset());
// Apply other mappings on local SVG coordinates.
return SVGLayoutSupport::pushMappingToContainer(this, ancestorToStopAt,
geometryMap);
}
LayoutRect LayoutSVGBlock::absoluteVisualRect() const {
return SVGLayoutSupport::visualRectInAncestorSpace(*this, *view());
}
bool LayoutSVGBlock::mapToVisualRectInAncestorSpace(
const LayoutBoxModelObject* ancestor,
LayoutRect& rect,
VisualRectFlags) const {
// Convert from local HTML coordinates to local SVG coordinates.
rect.moveBy(location());
// Apply other mappings on local SVG coordinates.
return SVGLayoutSupport::mapToVisualRectInAncestorSpace(
*this, ancestor, FloatRect(rect), rect);
}
bool LayoutSVGBlock::nodeAtPoint(HitTestResult&,
const HitTestLocation&,
const LayoutPoint&,
HitTestAction) {
ASSERT_NOT_REACHED();
return false;
}
} // namespace blink
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