Can't hide QTableView column after 'resetting' the QAbstractTableModel [Qt 5.5.1]

Phil_W

After resetting our QAbstractTableModel (subclass), attempting to hide a column no longer works.

After the model reset, when calling QTableView::hideColumn(int), I can see that QHeaderView::setSectionHidden() method always "gives up", thinking that the private "isVisualIndexHidden" state for that column is already in the hidden state. That is, this QHeaderView method is always exiting from line 11; it never gets to line 13 (i.e. after the model reset). However, the column remains visible on the screen.

01: void QHeaderView::setSectionHidden(int logicalIndex, bool hide)
02: {
03:     Q_D(QHeaderView);
04:     if (logicalIndex < 0 || logicalIndex >= count())
05:         return;
06: 
07:     d->executePostedLayout();
08:     int visual = visualIndex(logicalIndex);
09:     Q_ASSERT(visual != -1);
10:     if (hide == d->isVisualIndexHidden(visual))
11:         return;
12:     if (hide) {
13:         int size = d->headerSectionSize(visual);
14:         if (!d->hasAutoResizeSections())
15:             resizeSection(logicalIndex, 0);
16:         d->hiddenSectionSize.insert(logicalIndex, size);
17:         d->setVisualIndexHidden(visual, true);
18:         if (d->hasAutoResizeSections())
19:             d->doDelayedResizeSections();
20:     } else {
21:         int size = d->hiddenSectionSize.value(logicalIndex, d->defaultSectionSize);
22:         d->hiddenSectionSize.remove(logicalIndex);
23:         d->setVisualIndexHidden(visual, false);
24:         resizeSection(logicalIndex, size);
25:     }
26: }

I have also tried calling reset() on the QHeaderView after finishing the QAbstractTableModel reset (i.e. after the call to QAbstractItemModel::endResetModel()). That didn't help.

Is this a known problem in Qt 5.5.1?
(We're on Windows. This was not a problem with our prior Qt version, Qt 4.8.5).

SGaist

Hi,

To check if it's something known, you should take a look at the bug report system. If you can't find anything there, please consider opening a new report providing a minimal compile example that those the behaviour.

You might also want to try a more recent version of Qt.

Phil_W

We were able to solve the problem (in Qt 5.5.1) by recreating the QTableView's two QHeaderViews. We do this after changing the number of, or visibilty of rows or columns.

SGaist

Glad you found a solution !

Can you share a small sample code that triggers this behaviour ?