ApplicationWindow {
    id: mainWindow
    visible: true
    width: 640
    height: 480
    title: qsTr("Window")
    flags: Qt.FramelessWindowHint
    header: ToolBar {
        MouseArea{
            anchors.fill: parent
            property variant pressedPos: "0,0"

            onPressed: {
                pressedPos  = Qt.point(mouse.x, mouse.y)
            }

            onPositionChanged: {
                    var delta = Qt.point(mouse.x - pressedPos.x, mouse.y - pressedPos.y);
                    mainWindow.x += delta.x;
                    mainWindow.y += delta.y;
            }
        }
    }
}