QtQuick listview超出Rectangle的边界范围显示

ListModel{
                    id: ignoreListModel
                }
                Rectangle{
                    border.width: 1; border.color: "#A9A9A9"
                    Layout.minimumWidth: 150
                    Layout.minimumHeight: 100
                    ListView{
model: ignoreListModel
    id: listWidget
    anchors.fill: parent

    ScrollBar.vertical: ScrollBar{
         policy: ScrollBar.AlwaysOn
    }
    delegate: Rectangle{
        id: rectangle
        width: listWidget.width
        height: UIDefined._ListItemHeight
        anchors.left: parent.left
        property bool hovered: false
        border.color: UIDefined._HeightLightColor
        border.width: hovered ? UIDefined._ListItemBorderWidth : 0
        color:{
            if(listWidget.currentIndex === index)
                return UIDefined._PressedBgColor;
            else if(hovered)
                return UIDefined._HoveredBgColor
            else
                return UIDefined._FreeBgColor
        }
        Text {
            text: name
            verticalAlignment: Text.AlignVCenter
            horizontalAlignment: Text.AlignLeft
            anchors.fill: parent
            anchors.leftMargin: 5
            font.bold: (hovered || listWidget.currentItem == rectangle)
            color: UIDefined._UserTextColor
        }
        MouseArea{
            anchors.fill: parent; hoverEnabled: true
            onEntered: {hovered = true}
            onExited: {hovered = false}
            onClicked: {listWidget.currentIndex = index}
        }
    }
}
                }

Rectangle显示多一个，下拉时上方也会超过显示范围，如何使得listview不超出Rectangle的范围显示呢？