import QtQuick 2.12
import QtQuick.Controls 2.5

ApplicationWindow {
    visible: true
    width: 640
    height: 480

    Flickable {
        id: flickable

        anchors.fill: parent
    }
    Item {
        id: glassPane

        anchors.fill: parent

        PointHandler {
            id: handler

            target: Rectangle {
                parent: glassPane
                color: "red"
                visible: handler.active
                x: handler.point.position.x - width / 2
                y: handler.point.position.y - height / 2
                width: 100; height: width; radius: width / 2
            }
        }
    }
}