import QtQuick 2.0

Rectangle {
    width: 400
    height: 400

    property int counter: 0

    ListModel {
        id: list_model

        onRowsAboutToBeInserted: {
            var middle = (first + last)/2;
            list_view.positionViewAtIndex(middle, ListView.Center);
        }

        Component.onCompleted: {

            for (var i = 0; i < 1000; ++i)
            {
                list_model.append({ text: 'hello ' + (++counter) });
            }
        }

    }

    ListView {
        id: list_view
        anchors.fill: parent

        model: list_model

        delegate: Row {
            Text { text: model.text }
        }
    }

    MouseArea {
        anchors.fill:parent

        onClicked: {
            var at = Math.random() * (list_model.count - 1);
            list_model.insert(at, {text: 'hello ' + (++counter)});
        }
    }
}