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/*
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
* Copyright (C) 2016 Apple Inc. 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.
*/
#pragma once
#include "ExceptionOr.h"
#include "SVGAnimatedProperty.h"
#include "SVGProperty.h"
#include <wtf/WeakPtr.h>
namespace WebCore {
class SVGElement;
class SVGPropertyTearOffBase : public SVGProperty {
public:
virtual void detachWrapper() = 0;
};
template<typename T>
class SVGPropertyTearOff : public SVGPropertyTearOffBase {
public:
using PropertyType = T;
using Self = SVGPropertyTearOff<PropertyType>;
// Used for child types (baseVal/animVal) of a SVGAnimated* property (for example: SVGAnimatedLength::baseVal()).
// Also used for list tear offs (for example: text.x.baseVal.getItem(0)).
static Ref<Self> create(SVGAnimatedProperty& animatedProperty, SVGPropertyRole role, PropertyType& value)
{
return adoptRef(*new Self(animatedProperty, role, value));
}
// Used for non-animated POD types (for example: SVGSVGElement::createSVGLength()).
static Ref<Self> create(const PropertyType& initialValue)
{
return adoptRef(*new Self(initialValue));
}
static Ref<Self> create(const PropertyType* initialValue)
{
return adoptRef(*new Self(initialValue));
}
template<typename U> static ExceptionOr<Ref<Self>> create(ExceptionOr<U>&& initialValue)
{
if (initialValue.hasException())
return initialValue.releaseException();
return create(initialValue.releaseReturnValue());
}
virtual PropertyType& propertyReference() { return *m_value; }
SVGAnimatedProperty* animatedProperty() const { return m_animatedProperty.get(); }
virtual void setValue(PropertyType& value)
{
if (m_valueIsCopy) {
detachChildren();
delete m_value;
}
m_valueIsCopy = false;
m_value = &value;
}
void setAnimatedProperty(SVGAnimatedProperty* animatedProperty)
{
m_animatedProperty = animatedProperty;
}
SVGElement* contextElement() const
{
if (!m_animatedProperty || m_valueIsCopy)
return nullptr;
return m_animatedProperty->contextElement();
}
void addChild(WeakPtr<SVGPropertyTearOffBase> child)
{
m_childTearOffs.append(child);
}
void detachWrapper() override
{
if (m_valueIsCopy)
return;
detachChildren();
// Switch from a live value, to a non-live value.
// For example: <text x="50"/>
// var item = text.x.baseVal.getItem(0);
// text.setAttribute("x", "100");
// item.value still has to report '50' and it has to be possible to modify 'item'
// w/o changing the "new item" (with x=100) in the text element.
// Whenever the XML DOM modifies the "x" attribute, all existing wrappers are detached, using this function.
m_value = new PropertyType(*m_value);
m_valueIsCopy = true;
m_animatedProperty = nullptr;
}
void commitChange() override
{
if (!m_animatedProperty || m_valueIsCopy)
return;
m_animatedProperty->commitChange();
}
bool isReadOnly() const override
{
if (m_role == AnimValRole)
return true;
if (m_animatedProperty && m_animatedProperty->isReadOnly())
return true;
return false;
}
protected:
SVGPropertyTearOff(SVGAnimatedProperty* animatedProperty, SVGPropertyRole role, PropertyType& value)
: m_animatedProperty(animatedProperty)
, m_role(role)
, m_value(&value)
, m_valueIsCopy(false)
{
}
SVGPropertyTearOff(const PropertyType& initialValue)
: SVGPropertyTearOff(&initialValue)
{
}
SVGPropertyTearOff(const PropertyType* initialValue)
: m_animatedProperty(nullptr)
, m_role(UndefinedRole)
, m_value(initialValue ? new PropertyType(*initialValue) : nullptr)
, m_valueIsCopy(true)
{
}
virtual ~SVGPropertyTearOff()
{
if (m_valueIsCopy) {
detachChildren();
delete m_value;
}
if (m_animatedProperty)
m_animatedProperty->propertyWillBeDeleted(*this);
}
void detachChildren()
{
for (const auto& childTearOff : m_childTearOffs) {
if (childTearOff.get())
childTearOff.get()->detachWrapper();
}
m_childTearOffs.clear();
}
RefPtr<SVGAnimatedProperty> m_animatedProperty;
SVGPropertyRole m_role;
PropertyType* m_value;
Vector<WeakPtr<SVGPropertyTearOffBase>> m_childTearOffs;
bool m_valueIsCopy : 1;
};
}
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