甚至QTreeView::scrollTo
文件说:
Scroll the contents of the tree view until the given model item index is
visible. The hint parameter specifies more precisely where the item should
be located after the operation. If any of the parents of the model item
are collapsed, they will be expanded to ensure that the model item is visible.
这不是真的(我认为)
如果解决了手动扩展所有先前树级别的问题:
// This slot is invoqued from model using last selected item
void MyTreeWidget::ItemSelectedManually(const QModelIndex & ar_index)
{
std::vector<std::pair<int, int> > indexes;
// first of all, I save all item "offsets" relative to its parent
QModelIndex indexAbobe = ar_index.parent();
while (indexAbobe.isValid())
{
indexes.push_back(std::make_pair(indexAbobe.row(), indexAbobe.column()));
indexAbobe = indexAbobe.parent();
}
// now, select actual selection model
auto model = _viewer.selectionModel()->model();
// get root item
QModelIndex index = model->index(0, 0, QModelIndex());
if (index.isValid())
{
// now, expand all items below
for (auto it = indexes.rbegin(); it != indexes.rend() && index.isValid(); ++it)
{
auto row = (*it).first;
auto colum = (*it).second;
_viewer.setExpanded(index, true);
// and get a new item relative to parent
index = model->index(row, colum, index);
}
}
// finally, scroll to real item, after expanding everything above.
_viewer.scrollTo(ar_index);
}