Qt下TreeView修改分支样式

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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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。