当我滚动列表视图时，如何让列表视图的第一个元素始终可见？

Question

在我的代码中，我有一个包含 16 个元素的 ListView，我希望当我滚动 listview 时，第一个元素必须始终可见。我该怎么做？

ApplicationWindow {
    id: window
    visible: true
    width: 640
    height: 480


    ListView {
        id:listview
        anchors.fill: parent
        model: 16
        verticalLayoutDirection: ListView.BottomToTop
        delegate: Rectangle {
            height: listview.height/5
            width: listview.width
            color: Qt.rgba(Math.random(),Math.random(),Math.random(),1)
            Text {
               text: index
               anchors.fill: parent
               horizontalAlignment: Text.AlignHCenter
               verticalAlignment: Text.AlignVCenter
               color: "white"
               font.pixelSize: 35
            }
       }
    }
}

Answer 1

您可以使用标题。然后您的代码将如下所示：

ApplicationWindow {
    id: window
    visible: true
    width: 640
    height: 480


    ListView {
        id:listview
        anchors.fill: parent
        model: 15
        verticalLayoutDirection: ListView.BottomToTop

        headerPositioning: ListView.OverlayHeader

        header: Rectangle {
            height: listview.height/5
            width: listview.width
            color: Qt.rgba(Math.random(),Math.random(),Math.random(),1)
            z:2
            Text {
               text: "0"
               anchors.fill: parent
               horizontalAlignment: Text.AlignHCenter
               verticalAlignment: Text.AlignVCenter
               color: "white"
               font.pixelSize: 35
            }
        }

        delegate: Rectangle {
            height: listview.height/5
            width: listview.width
            color: Qt.rgba(Math.random(),Math.random(),Math.random(),1)
            Text {
               text: index+1
               anchors.fill: parent
               horizontalAlignment: Text.AlignHCenter
               verticalAlignment: Text.AlignVCenter
               color: "white"
               font.pixelSize: 35
            }
       }
    }
}