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/*
* Copyright (C) 2004, 2005, 2006, 2007, 2008 Nikolas Zimmermann
* <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.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.
*/
#ifndef SVGUseElement_h
#define SVGUseElement_h
#include "core/loader/resource/DocumentResource.h"
#include "core/svg/SVGAnimatedLength.h"
#include "core/svg/SVGGeometryElement.h"
#include "core/svg/SVGGraphicsElement.h"
#include "core/svg/SVGURIReference.h"
#include "platform/heap/Handle.h"
namespace blink {
class SVGUseElement final : public SVGGraphicsElement,
public SVGURIReference,
public DocumentResourceClient {
DEFINE_WRAPPERTYPEINFO();
USING_GARBAGE_COLLECTED_MIXIN(SVGUseElement);
USING_PRE_FINALIZER(SVGUseElement, dispose);
public:
static SVGUseElement* create(Document&);
~SVGUseElement() override;
void invalidateShadowTree();
// Return the element that should be used for clipping,
// or null if a valid clip element is not directly referenced.
SVGGraphicsElement* visibleTargetGraphicsElementForClipping() const;
SVGAnimatedLength* x() const { return m_x.get(); }
SVGAnimatedLength* y() const { return m_y.get(); }
SVGAnimatedLength* width() const { return m_width.get(); }
SVGAnimatedLength* height() const { return m_height.get(); }
void buildPendingResource() override;
void dispatchPendingEvent();
void toClipPath(Path&) const;
DECLARE_VIRTUAL_TRACE();
private:
explicit SVGUseElement(Document&);
void dispose();
FloatRect getBBox() override;
void collectStyleForPresentationAttribute(const QualifiedName&,
const AtomicString&,
MutableStylePropertySet*) override;
bool isStructurallyExternal() const override;
InsertionNotificationRequest insertedInto(ContainerNode*) override;
void removedFrom(ContainerNode*) override;
void svgAttributeChanged(const QualifiedName&) override;
LayoutObject* createLayoutObject(const ComputedStyle&) override;
void scheduleShadowTreeRecreation();
void cancelShadowTreeRecreation();
bool haveLoadedRequiredResources() override {
return !isStructurallyExternal() || m_haveFiredLoadEvent;
}
bool selfHasRelativeLengths() const override;
// Instance tree handling
Element* resolveTargetElement();
void buildShadowAndInstanceTree(SVGElement& target);
void clearInstanceRoot();
Element* createInstanceTree(SVGElement& targetRoot) const;
void clearShadowTree();
bool hasCycleUseReferencing(const SVGUseElement&,
const ContainerNode& targetInstance,
SVGElement*& newTarget) const;
bool expandUseElementsInShadowTree();
void addReferencesToFirstDegreeNestedUseElements(SVGElement& target);
void invalidateDependentShadowTrees();
bool resourceIsStillLoading() const;
bool resourceIsValid() const;
bool instanceTreeIsLoading() const;
void notifyFinished(Resource*) override;
String debugName() const override { return "SVGUseElement"; }
void updateTargetReference();
void setDocumentResource(DocumentResource*);
Member<SVGAnimatedLength> m_x;
Member<SVGAnimatedLength> m_y;
Member<SVGAnimatedLength> m_width;
Member<SVGAnimatedLength> m_height;
AtomicString m_elementIdentifier;
bool m_elementIdentifierIsLocal;
bool m_haveFiredLoadEvent;
bool m_needsShadowTreeRecreation;
Member<SVGElement> m_targetElementInstance;
Member<DocumentResource> m_resource;
};
} // namespace blink
#endif // SVGUseElement_h
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