如何让QML ListView栏目环绕项目？

import QtQuick 2.0

Item {
    property int columnCount: 3
    property int spacing: 10

    width: childrenWidth
    height: childrenHeight

    function calculateChildrenWidth() {
        var columnWidth = (width - (columnCount - 1) * spacing) / columnCount;
        return columnWidth * columnCount + (columnCount - 1) * spacing;
    }

    function calculateChildrenHeight() {
        var rowCount = Math.ceil(children.length / columnCount);
        var rowHeight = children[0].height;
        return rowCount * rowHeight + (rowCount - 1) * spacing;
    }

    property int childrenWidth: calculateChildrenWidth()
    property int childrenHeight: calculateChildrenHeight()

    Column {
        id: columnLayout
        width: parent.width
        spacing: parent.spacing

        Repeater {
            model: children.length
            delegate: Item {
                width: columnLayout.width / parent.columnCount
                height: children[0].height

                ColumnLayout {
                    width: parent.width
                    spacing: parent.spacing

                    // 子项内容
                }
            }
        }
    }
}