具有ItemDelegate背景的DropShadow

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delegate: Item{
        anchors.left: parent.left
        anchors.leftMargin: 10
        anchors.right: parent.right
        anchors.rightMargin: 10
        implicitWidth: delegateElement.implicitWidth
        implicitHeight: delegateElement.implicitHeight
        PropertiesView {
            id: delegateElement
            anchors.fill: parent
            background: Rectangle {
                id: elementDevice
                implicitWidth: 100
                implicitHeight: 40
                opacity: enabled ? 1 : 0.3
                color: delegateElement.down ? "#dddedf" : "#eeeeee"
            }
            smooth: true
            opacity:  0



        }

        DropShadow {
            anchors.fill: delegateElement
            cached: true
            horizontalOffset: 3
            verticalOffset: 3
            radius: 8.0
            samples: 16
            color: "#80000000"
            source: delegateElement
        }

    }