gecko-dev/dom/svg/SVGMPathElement.cpp

263 lines
7.7 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/ArrayUtils.h"
#include "mozilla/dom/SVGMPathElement.h"
#include "nsDebug.h"
#include "mozilla/dom/SVGAnimateMotionElement.h"
#include "mozilla/dom/SVGPathElement.h"
#include "nsContentUtils.h"
#include "mozilla/dom/SVGMPathElementBinding.h"
#include "nsIURI.h"
NS_IMPL_NS_NEW_NAMESPACED_SVG_ELEMENT(MPath)
namespace mozilla {
namespace dom {
JSObject*
SVGMPathElement::WrapNode(JSContext *aCx)
{
return SVGMPathElementBinding::Wrap(aCx, this);
}
nsSVGElement::StringInfo SVGMPathElement::sStringInfo[1] =
{
{ &nsGkAtoms::href, kNameSpaceID_XLink, false }
};
// Cycle collection magic -- based on nsSVGUseElement
NS_IMPL_CYCLE_COLLECTION_CLASS(SVGMPathElement)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(SVGMPathElement,
SVGMPathElementBase)
tmp->UnlinkHrefTarget(false);
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(SVGMPathElement,
SVGMPathElementBase)
tmp->mHrefTarget.Traverse(&cb);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
//----------------------------------------------------------------------
// nsISupports methods
NS_IMPL_ADDREF_INHERITED(SVGMPathElement,SVGMPathElementBase)
NS_IMPL_RELEASE_INHERITED(SVGMPathElement,SVGMPathElementBase)
NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(SVGMPathElement)
NS_INTERFACE_TABLE_INHERITED(SVGMPathElement, nsIDOMNode, nsIDOMElement,
nsIDOMSVGElement,
nsIMutationObserver)
NS_INTERFACE_TABLE_TAIL_INHERITING(SVGMPathElementBase)
// Constructor
SVGMPathElement::SVGMPathElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: SVGMPathElementBase(aNodeInfo),
mHrefTarget(this)
{
}
SVGMPathElement::~SVGMPathElement()
{
UnlinkHrefTarget(false);
}
//----------------------------------------------------------------------
// nsIDOMNode methods
NS_IMPL_ELEMENT_CLONE_WITH_INIT(SVGMPathElement)
already_AddRefed<SVGAnimatedString>
SVGMPathElement::Href()
{
return mStringAttributes[HREF].ToDOMAnimatedString(this);
}
//----------------------------------------------------------------------
// nsIContent methods
nsresult
SVGMPathElement::BindToTree(nsIDocument* aDocument,
nsIContent* aParent,
nsIContent* aBindingParent,
bool aCompileEventHandlers)
{
NS_ABORT_IF_FALSE(!mHrefTarget.get(),
"Shouldn't have href-target yet "
"(or it should've been cleared)");
nsresult rv = SVGMPathElementBase::BindToTree(aDocument, aParent,
aBindingParent,
aCompileEventHandlers);
NS_ENSURE_SUCCESS(rv,rv);
if (aDocument) {
const nsAttrValue* hrefAttrValue =
mAttrsAndChildren.GetAttr(nsGkAtoms::href, kNameSpaceID_XLink);
if (hrefAttrValue) {
UpdateHrefTarget(aParent, hrefAttrValue->GetStringValue());
}
}
return NS_OK;
}
void
SVGMPathElement::UnbindFromTree(bool aDeep, bool aNullParent)
{
UnlinkHrefTarget(true);
SVGMPathElementBase::UnbindFromTree(aDeep, aNullParent);
}
bool
SVGMPathElement::ParseAttribute(int32_t aNamespaceID,
nsIAtom* aAttribute,
const nsAString& aValue,
nsAttrValue& aResult)
{
bool returnVal =
SVGMPathElementBase::ParseAttribute(aNamespaceID, aAttribute,
aValue, aResult);
if (aNamespaceID == kNameSpaceID_XLink &&
aAttribute == nsGkAtoms::href &&
IsInDoc()) {
// NOTE: If we fail the IsInDoc call, it's ok -- we'll update the target
// on next BindToTree call.
UpdateHrefTarget(GetParent(), aValue);
}
return returnVal;
}
nsresult
SVGMPathElement::UnsetAttr(int32_t aNamespaceID,
nsIAtom* aAttribute, bool aNotify)
{
nsresult rv = SVGMPathElementBase::UnsetAttr(aNamespaceID, aAttribute,
aNotify);
NS_ENSURE_SUCCESS(rv, rv);
if (aNamespaceID == kNameSpaceID_XLink &&
aAttribute == nsGkAtoms::href) {
UnlinkHrefTarget(true);
}
return NS_OK;
}
//----------------------------------------------------------------------
// nsSVGElement methods
nsSVGElement::StringAttributesInfo
SVGMPathElement::GetStringInfo()
{
return StringAttributesInfo(mStringAttributes, sStringInfo,
ArrayLength(sStringInfo));
}
//----------------------------------------------------------------------
// nsIMutationObserver methods
void
SVGMPathElement::AttributeChanged(nsIDocument* aDocument,
Element* aElement,
int32_t aNameSpaceID,
nsIAtom* aAttribute,
int32_t aModType)
{
if (aNameSpaceID == kNameSpaceID_None) {
if (aAttribute == nsGkAtoms::d) {
NotifyParentOfMpathChange(GetParent());
}
}
}
//----------------------------------------------------------------------
// Public helper methods
SVGPathElement*
SVGMPathElement::GetReferencedPath()
{
if (!HasAttr(kNameSpaceID_XLink, nsGkAtoms::href)) {
NS_ABORT_IF_FALSE(!mHrefTarget.get(),
"We shouldn't have an xlink:href target "
"if we don't have an xlink:href attribute");
return nullptr;
}
nsIContent* genericTarget = mHrefTarget.get();
if (genericTarget && genericTarget->IsSVG(nsGkAtoms::path)) {
return static_cast<SVGPathElement*>(genericTarget);
}
return nullptr;
}
//----------------------------------------------------------------------
// Protected helper methods
void
SVGMPathElement::UpdateHrefTarget(nsIContent* aParent,
const nsAString& aHrefStr)
{
nsCOMPtr<nsIURI> targetURI;
nsCOMPtr<nsIURI> baseURI = GetBaseURI();
nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(targetURI),
aHrefStr, OwnerDoc(), baseURI);
// Stop observing old target (if any)
if (mHrefTarget.get()) {
mHrefTarget.get()->RemoveMutationObserver(this);
}
if (aParent) {
// Pass in |aParent| instead of |this| -- first argument is only used
// for a call to GetComposedDoc(), and |this| might not have a current
// document yet (if our caller is BindToTree).
mHrefTarget.Reset(aParent, targetURI);
} else {
// if we don't have a parent, then there's no animateMotion element
// depending on our target, so there's no point tracking it right now.
mHrefTarget.Unlink();
}
// Start observing new target (if any)
if (mHrefTarget.get()) {
mHrefTarget.get()->AddMutationObserver(this);
}
NotifyParentOfMpathChange(aParent);
}
void
SVGMPathElement::UnlinkHrefTarget(bool aNotifyParent)
{
// Stop observing old target (if any)
if (mHrefTarget.get()) {
mHrefTarget.get()->RemoveMutationObserver(this);
}
mHrefTarget.Unlink();
if (aNotifyParent) {
NotifyParentOfMpathChange(GetParent());
}
}
void
SVGMPathElement::NotifyParentOfMpathChange(nsIContent* aParent)
{
if (aParent && aParent->IsSVG(nsGkAtoms::animateMotion)) {
SVGAnimateMotionElement* animateMotionParent =
static_cast<SVGAnimateMotionElement*>(aParent);
animateMotionParent->MpathChanged();
AnimationNeedsResample();
}
}
} // namespace dom
} // namespace mozilla