QML 设置Rectangle部分边框颜色和宽度

Rectangle{
    id:rect;
    anchors.fill: parent;
    border.width: 3;
    color: "gray";
    border.color: "red";
}
Rectangle{
    anchors{
        fill: rect;
        bottomMargin:rect.border.width;
    }
    color: "gray";
}