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 ?