qt qtreewidget下拉箭头样式

您可以使用QSS（Qt样式表）来更改QTreeWidget下拉箭头的样式。以下是一个示例：

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

QTreeView::branch:has-siblings:adjoins-item {
    border-image: url(path/to/arrow-bottom.png) 0;
}

QTreeView::branch:!has-children:!has-siblings:adjoins-item {
    border-image: url(path/to/arrow-right.png) 0;
}

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

QTreeView::branch:open:has-children:has-siblings,
QTreeView::branch:open:has-children:!has-siblings {
    border-image: none;
    image: url(path/to/arrow-bottom.png);
}

QTreeView::branch:closed:has-children:!has-siblings {
    border-image: none;
    image: url(path/to/arrow-right.png);
}

在这个例子中，我们使用了五个CSS选择器来改变QTreeWidget下拉箭头的样式。您需要将箭头图像的路径替换为您自己的路径。