css::Declaration*
nsDOMCSSAttributeDeclaration::GetCSSDeclaration(PRBool aAllocate)
{
if (!mElement)
return nsnull;
css::StyleRule* cssRule;
#ifdef MOZ_SMIL
if (mIsSMILOverride)
cssRule = mElement->GetSMILOverrideStyleRule();
else
#endif // MOZ_SMIL
cssRule = mElement->GetInlineStyleRule();
if (cssRule) {
return cssRule->GetDeclaration();
}
if (!aAllocate) {
return nsnull;
}
// cannot fail
css::Declaration *decl = new css::Declaration();
decl->InitializeEmpty();
nsRefPtr<css::StyleRule> newRule = NS_NewCSSStyleRule(nsnull, decl);
// this *can* fail (inside SetAttrAndNotify, at least).
nsresult rv;
#ifdef MOZ_SMIL
if (mIsSMILOverride)
rv = mElement->SetSMILOverrideStyleRule(newRule, PR_FALSE);
else
#endif // MOZ_SMIL
rv = mElement->SetInlineStyleRule(newRule, PR_FALSE);
if (NS_FAILED(rv)) {
return nsnull; // the decl will be destroyed along with the style rule
}
return decl;
}
void
nsSVGElement::UpdateContentStyleRule()
{
NS_ASSERTION(!mContentStyleRule, "we already have a content style rule");
nsIDocument* doc = GetOwnerDoc();
if (!doc) {
NS_ERROR("SVG element without owner document");
return;
}
nsCOMPtr<nsIURI> baseURI = GetBaseURI();
nsIURI *docURI = doc->GetDocumentURI();
nsICSSLoader* cssLoader = doc->CSSLoader();
nsCSSDeclaration* declaration = nsnull;
nsCOMPtr<nsICSSParser> parser;
nsresult rv = NS_OK;
PRUint32 attrCount = mAttrsAndChildren.AttrCount();
for (PRUint32 i = 0; i < attrCount; ++i) {
const nsAttrName* attrName = mAttrsAndChildren.AttrNameAt(i);
if (!attrName->IsAtom() || !IsAttributeMapped(attrName->Atom()))
continue;
if (!declaration) {
// Create the nsCSSDeclaration.
declaration = new nsCSSDeclaration();
if (!declaration) {
NS_WARNING("Failed to allocate nsCSSDeclaration");
return;
}
if (!declaration->InitializeEmpty()) {
NS_WARNING("could not initialize nsCSSDeclaration");
declaration->RuleAbort(); // deletes declaration
return;
}
// Try to fetch the CSS Parser from the document.
rv = cssLoader->GetParserFor(nsnull, getter_AddRefs(parser));
if (NS_FAILED(rv)) {
NS_WARNING("failed to get a css parser");
declaration->RuleAbort(); // deletes declaration
return;
}
// SVG and CSS differ slightly in their interpretation of some of
// the attributes. SVG allows attributes of the form: font-size="5"
// (style="font-size: 5" if using a style attribute)
// where CSS requires units: font-size="5pt" (style="font-size: 5pt")
// Set a flag to pass information to the parser so that we can use
// the CSS parser to parse the font-size attribute. Note that this
// does *not* affect the use of CSS stylesheets, which will still
// require units.
parser->SetSVGMode(PR_TRUE);
}
nsAutoString name;
attrName->Atom()->ToString(name);
nsAutoString value;
mAttrsAndChildren.AttrAt(i)->ToString(value);
PRBool changed;
parser->ParseProperty(nsCSSProps::LookupProperty(name), value,
docURI, baseURI, NodePrincipal(),
declaration, &changed);
}
if (declaration) {
rv = NS_NewCSSStyleRule(getter_AddRefs(mContentStyleRule), nsnull, declaration);
if (NS_FAILED(rv)) {
NS_WARNING("could not create contentstylerule");
declaration->RuleAbort(); // deletes declaration
}
// Recycle the parser
parser->SetSVGMode(PR_FALSE);
cssLoader->RecycleParser(parser);
}
}
