Question

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 1

You can dynamically load items using the Loader element, and then set the ‘control’ property to be an alias that directly refers to the loader’s sourceComponent property.

So your Container.qml could look like this:

Item {
    property string label
    property alias control : loader.sourceComponent

    width: 200; height: 200

    Row {
        Label { text: label }
        Loader { id: loader }
    }
}

Now when you assign a graphical item to the ‘control’ property, it will automatically be displayed by the Loader.