Access Listview currentIndex from Delegate

Question

I have a QML ListView where the delegate loads it\'s component from another file. When clicking on an delegate item, I want to update ListView. C

Answer 1

There are two problems here:

• You need to qualify ListView's attached properties with the name of the item from which they're accessed.
• The currentIndex property is a property of the ListView item type, not the attached property object.

To fix them both, first change this:

ListView.currentIndex = index;

to this:

delegate.ListView.view.currentIndex = index;

And then give your delegate an id:

Component {
    id: contact

    Rectangle {
        id: delegate
    // ...
}

This is demonstrated (in part) by the Example Usage section of the documentation:

ListView attaches a number of properties to the root item of the delegate, for example ListView:isCurrentItem. In the following example, the root delegate item can access this attached property directly as ListView.isCurrentItem, while the child contactInfo object must refer to this property as wrapper.ListView.isCurrentItem.

Answer 2

Use attached property ListView.view:

This attached property holds the view that manages this delegate instance

Small example:

import QtQuick 2.4
import QtQuick.Window 2.2
import QtQuick.Layouts 1.1

Window {
    width: 600
    height: 400
    visible: true

    Component {
        id: listDelegate
        Rectangle {
            height: 30
            width: parent.width
            color:  ListView.isCurrentItem ? "orange" : "white"
            property var view: ListView.view
            property int itemIndex: index
            Text { anchors.centerIn: parent; text: name }
            MouseArea {
                anchors.fill: parent
                onClicked: {
                    view.currentIndex = itemIndex;
                }
            }
        }
    }

    RowLayout {
        anchors.fill: parent
        ListView {
            Layout.minimumWidth: parent.width / 2
            Layout.fillHeight: true
            model: ListModel {
                ListElement {name: "item1.1"}
                ListElement {name: "item1.2"}
                ListElement {name: "item1.3"}
            }
            delegate: listDelegate
        }
        ListView {
            Layout.minimumWidth: parent.width / 2
            Layout.fillHeight: true
            model: ListModel {
                ListElement {name: "item2.1"}
                ListElement {name: "item2.2"}
                ListElement {name: "item2.3"}
            }
            delegate: listDelegate
        }
    }
}