To access the properties of QML context through several QML files

It seems so basic, but I don't see how well...

I put a 'WebAPI' context property to access my class that makes HTTP requests etc. WebAPI works very well main.qml, but when I try and use it in the included LargeThumbItem.qml I get:

"LargeThumbItem.qml:37: ReferenceError: can't find variable: WebAPI.

How to set a context property that is available for * all * my QML files? What is the best practice for this?

hand. QML

{

...

{ListItemComponent}

type: 'point '.

LargeThumbItem {

}

}

....

}

LargeThumbItem.qml

{

....

WebAPI.getImagePath (...)

...

}

I do the usual configuration...

QmlDocument * qml = QmlDocument::create("asset:///main.qml").parent(this);

QML-> setContextProperty ("WebAPI", m_pWebAPI);

I tried calling qml-> documentContext()-> setContextProperty(), but it did not work. Is there a global context that I can put all documents will inherit? (the API documentation seems to suggest there is).

This problem is related to what is described here and the solution is the same. The problem is that the ListItemComponents have a different context and lifecylce due to the fact that they are cached in and out as the scrolls of the ListView (see here for details).

I solved it by adding a dynamic property on the global object of 'Qt' for example in onCreationCompleted() or anywhere where the senses in main.qml. In my case, I chose to pass a string, because I don't know if the global property to the instance around WebAPI is a good idea.

Qt.homeListBaseURL = WebAPI.getImagePath ("TitleImagePathPrefix", "170 x 240")

Then in LargeThumbItem.qml for example

{WebImageView}

...

URL: Qt.homeListBaseURL + ListItemData.ContentId + '.jpg '.

...

}

Tags: BlackBerry Developers

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