How can I call GetStyle() of nsIDOMNSHTMLElement

[hap497]

Hi,

If I have a pointer to nsIDOMNSHTMLElement* element, how can I call
the GetStyle()?

In nsGenericHTMLElement.h, it said
// nsIDOMNSHTMLElement methods. Note that these are non-virtual
// methods, implementations are expected to forward calls to these
// methods.
// Forward to GetStyle which is protected in the super-class
inline nsresult GetStyle(nsIDOMCSSStyleDeclaration** aStyle)

But when I do
nsIDOMNSHTMLElement* element;
nsCOMPtr<nsIDOMCSSStyleDeclaration> cssDecl;

nsresult result = element->GetStyle(getter_AddRefs(cssDecl));

My code will not compile.

So can I safely cast my nsIDOMNSHTMLElement* to nsGenericHTMLElement*
and call GetStyle() that way?

Thank you.

[Boris Zbarsky]

Post by hap497
If I have a pointer to nsIDOMNSHTMLElement* element, how can I call
the GetStyle()?

http://mxr.mozilla.org/mozilla-central/source/dom/interfaces/css/nsIDOMElementCSSInlineStyle.idl#42

-Boris

[Jens Sorensen]

I assume you have a valid nsIDOMElement pointer ..

nsCOMPtr<nsIDOMElement> domElement; // valid pointer to a DOM element

// QI nsIDOMElementCSSInlineStyle
nsCOMPtr<nsIDOMElementCSSInlineStyle> elementCSSInlineStyle =
do_QueryInterface(domElement);

// And get the style...
nsCOMPtr<nsIDOMCSSStyleDeclaration> domCSSStyleDecl;
domCSSStyleDecl->GetStyle( getter_AddRefs(domCSSStyleDecl));

-Jens

Post by hap497
Hi,
If I have a pointer to nsIDOMNSHTMLElement* element, how can I call
the GetStyle()?
In nsGenericHTMLElement.h, it said
// nsIDOMNSHTMLElement methods. Note that these are non-virtual
 // methods, implementations are expected to forward calls to these
 // methods.
 // Forward to GetStyle which is protected in the super-class
 inline nsresult GetStyle(nsIDOMCSSStyleDeclaration** aStyle)
But when I do
nsIDOMNSHTMLElement* element;
 nsCOMPtr<nsIDOMCSSStyleDeclaration> cssDecl;
 nsresult result  = element->GetStyle(getter_AddRefs(cssDecl));
My code will not compile.
So can I safely cast my nsIDOMNSHTMLElement* to nsGenericHTMLElement*
and call GetStyle() that way?
Thank you.
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