F1查找Qt帮助，原文如下：

QTreeView::branch:has-siblings:!adjoins-item {
    border-image: url(vline.png) 0;
}


QTreeView::branch:has-siblings:adjoins-item {
    border-image: url(branch-more.png) 0;
}


QTreeView::branch:!has-children:!has-siblings:adjoins-item {
    border-image: url(branch-end.png) 0;
}


QTreeView::branch:has-children:!has-siblings:closed,
QTreeView::branch:closed:has-children:has-siblings {
        border-image: none;
        image: url(branch-closed.png);
}


QTreeView::branch:open:has-children:!has-siblings,
QTreeView::branch:open:has-children:has-siblings  {
        border-image: none;
        image: url(branch-open.png);
}
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Qt下TreeView修改分支样式_sed

自己摸索实现分支三态，代码如下：

QTreeView::branch:has-children:!has-siblings:closed,
QTreeView::branch:closed:has-children:has-siblings {
border-image: none;
image: url(:/down_n.png);
}

QTreeView::branch:has-children:!has-siblings:closed:hover,
QTreeView::branch:closed:has-children:has-siblings:hover {
border-image: none;
image: url(:/down_h.png);
}

QTreeView::branch:has-children:!has-siblings:closed:pressed,
QTreeView::branch:closed:has-children:has-siblings:pressed {
border-image: none;
image: url(:/down_p.png);
}

QTreeView::branch:open:has-children:!has-siblings,
QTreeView::branch:open:has-children:has-siblings {
border-image: none;
image: url(:/up_n.png);
width:30px;
height:30px;
}

QTreeView::branch:open:has-children:!has-siblings:hover,
QTreeView::branch:open:has-children:has-siblings:hover {
border-image: none;
image: url(:/up_h.png);
}

QTreeView::branch:open:has-children:!has-siblings:pressed,
QTreeView::branch:open:has-children:has-siblings:pressed {
border-image: none;
image: url(:/up_p.png);
}
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但贴图后发现图片模糊，修改分支宽度如何修改呢？
在样式里面直接写入width发现不可行。后经别人提醒在TreeView里面设置indentation即可。
Qt下TreeView修改分支样式_sed_02