Accessing ListModel from ListView Section Delegate-CodePudding

I am new in QML/Qt Quick and I want to use ListView which has a section property. Main goal was creating collapsible ListView on my UI. My problem is Section delegate LoadcaseListElement needs some data from ListView's model which is loadcaseModel in here. But I cannot access my ListView model from my Section Delegate Element LoadcaseListElement . (I can access it from ListView Delegate which is layerDelegateItem).

The simplified code snippet is here: (The snippet does not include all js functions, element properties, etc. to achive collapsing action in favor of clarity.)

ListModel {
    id: loadcaseModel
    ListElement {loadcaseId:"1"; name:"LC1_Honeycomb Radome LLD3"; plyCount:"7"; layerId: "5001"}
    ListElement {loadcaseId:"1"; name:"LC1_Honeycomb Radome LLD3"; plyCount:"7"; layerId: "5002"}

}  

ListView {
    id: loadcaseListView
   
    anchors.fill: parent

    model: loadcaseModel

    delegate: LayerDelegate {
        id: layerDelegateItem

        anchors {
            left: parent.left
            leftMargin: 2
            right: parent.right
            rightMargin: 2
        }

    }

    section {
        property: "loadcaseId"
        criteria: ViewSection.FullString

        delegate: LoadcaseListElement {
            listElementLoadcaseNumber: model.loadcaseId
        }
    }
}

Thanks for your help...

Enes

CodePudding user response：

If the only data you need to access is the property that you are sectioning on, then you should be able to use the section attached property mentioned in the docs:

    section {
        property: "loadcaseId"
        criteria: ViewSection.FullString

        delegate: LoadcaseListElement {
            listElementLoadcaseNumber: section
        }
    }

UPDATE:

You're trying to use section in a way that it wasn't intended, so you're running into obstacles. I recommend first organizing your model in a nested fashion. Then make your delegate smart enough to expand/hide its sub-list of elements. Here is an example that shows one way to do this.