Hi
i'm reopening this old subject as i struggling with the exact same issue.

To sum it up i'd like to have a qml file to centralise the delegates that will be used to print items in my MapItemView.

Here's where i'm at :

In my main map view :

MapItemView
{
    id: mapMarkers
    model: MapMarkerModels{}
    delegate: MapMarkerMultiDelegate{}
}

MapMarkerModels.qml

ListModel
{
    id: someModels
    ListElement {type: "cursor"; lat: 43.778958; lon:3.812109}
    ListElement {type: "circle"; lat: 43.788958; lon:3.812109}
    ListElement {type: "circle"; lat: 43.798958; lon:3.812109}
}

and MapMarkerMultiDelegate.qml

Loader
{
    id: mapMarkerMultiDelegate
    sourceComponent: getDelegate(type)

    function getDelegate(t) {
        switch(t)
        {
            case "cursor": return cursorDelegate;
            case "circle": return circleDelegate;
            default: return circleDelegate;
        }
    }

    Component
    {
        id: cursorDelegate
        MapQuickItem
        {
            id: cursor
            anchorPoint.x: rect.width / 2
            anchorPoint.y:  rect.height / 2
            coordinate
            {
                latitude: lat
                longitude: lon
            }

            sourceItem:
                Rectangle
                {
                    id: rect
                    width: 25
                    height: 25
                    color: "blue"
                }
        }
    }

    Component
    {
        id: circleDelegate
        MapCircle
        {
            center
            {
                latitude: lat
                longitude: lon
            }
            radius: 500.0
            color: 'green'
            border.width: 3
        }
    }
}

It doesn't show anything on the map.
If y break in "getDelegate(type)" it seems to be returning the good component.
But I get a message in the output :
"addDelegateToMap called with a MapMarkerMultiDelegate_QMLTYPE_1"

If i remove the Loader and simply put one of the Component in the MapMarkerMultiDelegate.qml file it works fine and print what i want.

I've only be playing with Qt for a few days so i might be doing everything wrong. Still this is tickeling me so if any of you have an idea =)