How do you assign a QML Item to a component property in QML and then use that object inside the component?

Jack Benson picture Jack Benson · Feb 16, 2011 · Viewed 34.3k times · Source

I'm trying to create a QML object that acts like a wrapper for other objects. Here's my QML file (Container.qml):

Item {
    property string label
    property Item control

    Row {
        Label {
            text: label
        }

        // Not sure how to display the control assigned to the control property
    }
}

What I would like to do (in my QML that consumes this component) is something like this:

Container {
    label: "My Label"
    control: Textbox {
        text: "My Value"
    }
}

When fed that QML the result (in the interface) should be something resembling the output from this QML:

Item {
    Row {
        Label {
            text: "My Label"
        }
        Textbox {
            text: "My Value"
        }
    }
}

Is this possible? When I try to do this I get "cannot assign object to property" when assigning an Item to the control property. I've searched the Qt forums and Googled this mercilessly, but no success. If anybody knows the answer it would be greatly appreciated.

Thanks

Jack

Answer

s.maks picture s.maks · Apr 5, 2012

There is much better solution:

/* MyObject.qml */

Rectangle {
    default property alias data /* name can be any */ : inner_space.data

    /* ... You can put other elements here ... */
    Item {
       id: inner_space

       /* ... Params ... */
    }
    /* ... You can put other elements here ... */
}

And now we can do all we want!

/* main.qml */

Rectangle {
    MyObject {
        Button {
             /* ... */
        }
    }
}

Thanks to user bobbaluba for suggesting to use the data property rather than children.