Hi,
On 14/07/2010, at 12:09 AM, ext Daker Fernandes wrote:
How to access a XmlListModel roles without any kind of View?
XmlListModel {
id: xkcdModel
source: "http://xkcd.com/100/";;
XmlRole { name: "image"; query: "/title/text()" }
}
Text {
text: xkcdModel.get(0).image
}
I really need to create a View? There is a better way to do it?
The ListModel classes are really designed to be used by the views (and other
elements that know about models). So the above can be made to work, but it is
not optimal:
XmlListModel {
source: "http://xkcd.com/100/";;
query: "/html/head"
namespaceDeclarations: "declare default element namespace
'http://www.w3.org/1999/xhtml';"
XmlRole { name: "image"; query: "title/string()" }
onStatusChanged: {
if (status == XmlListModel.Ready)
titleText.text = get(0).image;
}
}
Text {
id: titleText
}
Note that get() won't work in a binding -- before the model is loaded it
returns an undefined object, and currently the engine doesn't have a reliable
way of knowing when that binding would need to be updated. This is quite
non-intuitive (and something we've tried very hard to avoid), so I think we
should look at whether we can improve the docs, error message, and/or behavior
in this case.
We'll be looking more at models after the 4.7 release, including looking at
making them more generically accessible. On the other hand, for this particular
case a new XmlObject element would probably make more sense than using
XmlListModel (given that there is no list involved).
Regards,
Michael
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