Just a guess, but I believe StyleSheet is abstract, and if you want to
craft a stylesheet, you'd probably use CSSStyleSheet instead.
dave
On Jun 5, 2009, at 3:28 AM, Suk Zhong wrote:
Hi All:
We're trying to extend WebKit dom js binding.We have some
questions.
in DOMWindow.idl having the following code:
attribute StyleSheetConstructor StyleSheet;
attribute [JSCCustomGetter] XMLHttpRequestConstructor
XMLHttpRequest;
and we find class JSXMLHttpRequestConstructor has function
getConstructData, while JSStyleSheetConstructor doesn't have
function getConstructData.
if test the following js script:"var a = new XMLHttpRequest;",
it's ok;but "var a = new StyleSheet;", it'll throw an exception.
and we trac this problem to Interpreter::privateExecute() and
JSValuePtr::getConstructData function
inline ConstructType JSValuePtr::getConstructData(ConstructData&
constructData)
{
return JSImmediate::isImmediate(asValue()) ?
ConstructTypeNone : asCell()->getConstructData(constructData);
}
and we know this function returns ConstructTypeNone for
JSStyleSheetConstructor object, ConstructTypeHost for
JSXMLHttpRequestConstructor object;
JSStyleSheetConstructor object and JSXMLHttpRequestConstructor
object are returned by the same template function getDOMConstructor.
our questions are:
1.why it has this return?
2.which codes make the two object have different immediate value?
3.some people can explain the whole role of class JSImmediate?
4.our trac maybe be not correct,who can explain why newing
StyleSheet has exception and newing XMLHttpRequest is OK?
Thanks and Best Regards
Suk
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