大家好。我目前正在做QTreeView，通过自定义Style Sheets自定义外观，想要区分根节点和叶子节点。但是在Style Sheets中没有找到相应的方法。我看了一下Qt的属性选择器可能是突破口，但是还没有思路。

现在达到这样的效果了：


如果能够区分根节点和叶子节点，那么我就可以将根节点的图片换成不带连接点的＋号了。
QSS代码如下：

QTreeView::branch:has-siblings:!adjoins-item {

    margin-left: 6px;

    border-image: url(:/branch-vline.png);

}



QTreeView::branch:!has-children:has-siblings:adjoins-item {

    image: url(:/branch-more.svg);

    margin-left: -45px;

    background-image: url(:/branch-single.svg);

    background-position: right;

    background-repeat: no-repeat;

}



QTreeView::branch:!has-children:!has-siblings:adjoins-item {

    border-image: none;

    image: url(:/branch-end.svg);

    margin-left: -45px;

    background-image: url(:/branch-single.svg);

    background-position: right;

    background-repeat: no-repeat;

}



QTreeView::branch:has-children:adjoins-item:open {

    border-image: none;

    image: url(:/branch-more.svg);

    margin-left: -45px;

    background-image: url(:/branch-open.svg);

    background-position: right;

    background-repeat: no-repeat;

}



QTreeView::branch:has-children:adjoins-item:closed {

    border-image: none;

    image: url(:/branch-more.svg);

    margin-left: -45px;

    background-image: url(:/branch-closed.svg);

    background-position: right;

    background-repeat: no-repeat;

}



QTreeView::branch:has-children:adjoins-item:open:first {

    background-image: url(:/branch-root-open.svg);

}



QTreeView::branch:has-children:adjoins-item:closed:first {

    background-image: url(:/branch-root-closed.svg);

}