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(".")));
 
 
}

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(".")));


}

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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.

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));

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

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

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

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

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that can rewrite like ...

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

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

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[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;            
    }
};

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;            
    }
};

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This works fine for me.