Nevermind the filter, the problem occurs when setting KDescendantsProxyModel to
SubTreesWithoutRoots. Using ChildrenOfExactSelection does not produce this
problem, with or without QSortFilterProxyModel after it. So it is most likely
an issue in KDescendantsProxyModel.
From: Rodrigo Oliva
Sent: martes, 5 de junio de 2018 18:22
To: 'interest@qt-project.org' <interest@qt-project.org>
Subject: KDescendantsProxyModel + QSortFilterProxyModel issue
Hello, I've been using kde's kitemmodels library to make a content explorer.
I have two panels, the left one which is a QTreeView that shows a folder tree
structure and the right one which is a QListView that shows a list of files and
folders from the current selected folder in the left panel, ignoring folder
structure. The list view can then be filtered with a search box.
Example use case:
Left
- Folder1
- Folder2 (selected)
o Folder3
§ File1
Right
- Folder3
- File1
The way I wanted to do this was using the same source model for both panels,
using proxy models to show whatever I want in each of the panels. The
kitemmodels lib is great for this.
The structure looks like this (mailing list friendly, indentation marks model
ancestry):
- Source Model (modeled as a tree).
o Left QSortFilterProxyModel
o KSelectionProxyModel
§ KDescendantsProxyModel - set to SubTreesWithoutRoots
· Right QSortFilterProxyModel
Everything works great, except when I insert rows in the source model while
there is an active filter in the right QSortFilterProxyModel, in the
filterAcceptsRow. It looks like this
bool RightSortFilterProxyModel::filterAcceptsRow(int source_row, const
QModelIndex& source_parent) const {
Q_ASSERT(!source_parent.isValid()); // we are filtering a list
QModelIndex sourceIndex = sourceModel()->index(source_row, 0);
if (!sourceIndex.isValid()) {
return false;
}
QString key = sourceModel()->data(sourceIndex).toString();
return filterRegExp().isEmpty() ? true : key.contains(filterRegExp());
}
When sourceModel()->data(sourceIndex) is called, I get an assert in the
RightSortFilterProxyModel source model, the KDescendantsProxyModel: "Didn't
find target row.", in its mapToSource function. When run in release, the list
gets filled with a bunch of empty rows.
The source index is not invalid and sourceModel()->rowCount() returns greater
than 0.
Am I doing something wrong in this filterAcceptsRow? The strange thing is that
this works perfectly without the filter.
Excuse me if this not the right mailing list for this, I found some questions
related to this in qt-interest-old.
Cheers,
Rodrigo
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