QFileSystemModel and QSortFilterProxyModel don't work well together?

[solotim]

Hi, I found that QSortFilterProxyModel can't filter properly when it works with QFileSystemModel. Sometimes it left NOTHING in the view. Can anyone point out where I'm wrong?

Just create a simple GUI example:


MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QFileSystemModel *fsm = new QFileSystemModel(this);
fsm->setRootPath(".");

QSortFilterProxyModel *sfpm = new QSortFilterProxyModel();
sfpm->setDynamicSortFilter(true);
sfpm->setSourceModel(fsm);
sfpm->setFilterRegExp(QRegExp(".cpp", Qt::CaseInsensitive,
QRegExp::FixedString));
sfpm->setFilterKeyColumn(0);

ui->tableView->setModel(sfpm);

ui->tableView->setRootIndex(sfpm->mapFromSource(fsm->index(".")));


}

if you comment out the setFilterRegExp statement, sure the files in current path are shown in the view. I've also tried setFilterWildcard and other RegExp, nothing works. Very frustrating.

[spirit]

Th doc says (http://qt-project.org/doc/qt-4.8/qsortfilterproxymodel.html#filtering).

For hierarchical models, the filter is applied recursively to all children. If a parent item doesn't match the filter, none of its children will be shown.
So, "." != "your directory name".

[ecanela]

this code only filter the file who name is EXACTLY ".cpp", line 12 and 13

sfpm->setFilterRegExp(QRegExp(".cpp", Qt::CaseInsensitive,QRegExp::FixedString));

this code filter all the file who suffix are "cpp",

sfpm->setFilterRegExp(QRegExp("*.cpp", Qt::CaseInsensitive,QRegExp::WildcardUnix));

that can rewrite like ...


sfpm->setFilterCaseSensitivity(Qt::CaseInsensitive);
sfpm->setFilterWildcard ("*.cpp");

[solotim]

Thanks, All. But I think spirit is basic right. It has nothing to do with if the RegExp is correct. The real problem is hierarchical data model. I need to subclass QSortFilterProxyModel to do something concerning "source_parent":


class MySortFilterProxyModel : public QSortFilterProxyModel
{
protected:
virtual bool MySortFilterProxyModel::filterAcceptsRow(
int source_row, const QModelIndex &source_parent) const{
QFileSystemModel *sm = qobject_cast<QFileSystemModel*>(sourceModel());
if (source_parent == sm->index(sm->rootPath())) {
return QSortFilterProxyModel::filterAcceptsRow(source_row , source_parent);
}
return true;
}
};

This works fine for me.