How to add elements to a DelegateModelGroup depending on a property

Question

I have a ListModel and a DelegateModel, a ListView and 3 Buttons. The DelegateModel has one Group: myGroup With a click on of the first two buttons, I add elements to the Li

Answer 1

For those who are interested in it, with the hint of user2436719 I was able to hack together this model. It is a ListModel, and examplewise two DelegateModels, with groups to which the elements are added depending on a role of the listmodel.

ListModel{
    id: rootModel
    onCountChanged: setGroups(count - 1)
    onDataChanged: setGroups(arguments[0].row)
    property DelegateModel sub1:
        DelegateModel {
            id: subModel1
            model: rootModel
            groups: [
                DelegateModelGroup { name: 'myGroup' },
                DelegateModelGroup { name: 'notMyGroup' }
            ]
            delegate: Rectangle {
                width: model.width
                height: model.height
                color: model.color
                border.width: 1
            }
            filterOnGroup: (root.toggle ? 'myGroup' : 'notMyGroup')
        }
    property DelegateModel sub2:
        DelegateModel {
            id: subModel2
            model: rootModel
            groups: [
                DelegateModelGroup { name: 'myGroup' },
                DelegateModelGroup { name: 'notMyGroup' }
            ]
            delegate: Rectangle {
                radius: 5
                width: model.width
                height: model.height
                color: model.color
                border.width: 1

                Text {
                    anchors.centerIn: parent
                    text: DelegateModel.groups.toString()
                }
            }
            filterOnGroup: (root.toggle ? 'myGroup' : 'notMyGroup')
        }

    function setGroups(index) {
        console.log('set Groups for', index)
        var i = get(index)
        subModel1.items.setGroups(index, 1, ['items', (i.width === 80 ? 'myGroup' : 'notMyGroup')])
        subModel2.items.setGroups(index, 1, ['items', (i.width !== 80 ? 'myGroup' : 'notMyGroup')])
    }
}