关于QTreeView节点展开的问题

[shn521]

QTreeView里的QStandardItemModel添加了QStandardItem，QStandardItem下面有子QStandardItem，如果添加后让QTreeView自动展开该节点呢？

[懒懒的吉他手]

void QTreeView::expandAll () [slot] Expands all expandable items. Warning: if the model contains a large number of items, this function will take some time to execute. This function was introduced in Qt 4.2.