[提问] 如何正确使用Glow效果

[Jianren Yin]

我想把http://labs.qt.nokia.com/2012/02/02/qt-graphical-effects-in-qt-labs/的效果 应用到listView的高亮的item上去。也就是当符合某条件时，激活glow效果。写了一个测试例子，点击"Text" 时激活glow效果，但是没有效果，麻烦大家指点一下。代码如下：
@
import QtQuick 2.0
import QtGraphicalEffects 1.0

Rectangle {
width: 200; height: 200
color: "black"

Text {
    id: text
    anchors.centerIn: parent
    text: "Hello Qt!"
    font.pixelSize: 30
    color: "white"
}
/* : Work but not my expectation

Glow {
    anchors.fill: text
    source: text
    color: "red"
    radius: 10
    samples: 20
    visible: true

    NumberAnimation on spread {
        from: 0; to: 0.8; duration: 1000
        loops: NumberAnimation.Infinite
        easing.type: Easing.InOutQuad
    }
}
*/


Loader {
    id: loader
    focus: true
}

MouseArea {
    anchors.fill: parent
    onClicked: {
        console.log("Clicked")
        loader.sourceComponent = glowEffect
    }
}

Component {
    id: glowEffect
    Glow {
        anchors.fill: parent
        source: parent
        color: "red"
        radius: 10
        samples: 20
        visible: true

        NumberAnimation on spread {
            from: 0; to: 0.8; duration: 1000
            loops: NumberAnimation.Infinite
            easing.type: Easing.InOutQuad
        }
    }
}

}
@

[Jianren Yin]

原因出在anchors.fill 和 source, 修改如下：
@
// anchors.fill: parent
x: text.x; y: text.y
width: text.width; height: text.height
source: text
@