如何在qtquick controls 2.3中自定义ScrollView

import QtQuick 2.15
import QtQuick.Controls 2.3

ScrollView {
    width: 400
    height: 300
    
    Rectangle {
        width: 800
        height: 600
        color: "red"
    }
}

ScrollView {
    width: 400
    height: 300
    style: ScrollViewStyle {
        // 自定义外观属性
    }
    
    Rectangle {
        width: 800
        height: 600
        color: "red"
    }
}

ScrollViewStyle {
    scrollBarBackground: Rectangle {
        color: "lightgray"
    }
    
    scrollBarHandle: Rectangle {
        color: "gray"
    }
    
    scrollBarPolicy: Qt.ScrollBarAlwaysOn
}

ScrollView {
    width: 400
    height: 300
    contentX: 100
    contentY: 200
    
    onContentXChanged: {
        console.log("Content X changed:", contentX)
    }
    
    onContentYChanged: {
        console.log("Content Y changed:", contentY)
    }
    
    Rectangle {
        width: 800
        height: 600
        color: "red"
    }
}