QSortFilterProxyModel search problem

[krix]

Hi yall,
so I'm trying to do a mulltiple-field sort (i.e. first by surname then by name) and I've chosen to subclass the QSortFilterProxyModel.
I've subclassed it and reimplemented functions

    virtual bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const;
    virtual bool lessThan(const QModelIndex &left, const QModelIndex &right) const;

Then my model is derived from a QAbstractListModel (I want to just keep the reference to a list being kept elsewhere)
so I reimplemented functions

    //basic function for a read-only model
    int rowCount ( const QModelIndex & parent = QModelIndex() ) const;
    QVariant data ( const QModelIndex & index, int role = Qt::DisplayRole ) const ;

Then all this content is controlled in a custom list (the purpose is to add i.e. the kinetic scrolling with Flickable)

    class MyList : public QListView

and displayed in a custom delegate

    class MyDelegate : public QItemDelegate

In the constructor of the widget that holds that list (it's a central Widget) I do:

    m_listview = new MyList(this);
    m_listview->setStyle(new QWindowsStyle);
    m_listview->setAutoFillBackground(true);

    MyModel *model = new MyModel (dataArray, this);

    MySortProxyModel *proxy = new MySortProxyModel(this);
    proxy->setDynamicSortFilter(true);
    proxy->setSourceModel(model);
    m_listview->setModel(proxy);

    MyDelegate *delegate = new MyDelegate(this);
    m_listview->setItemDelegate(delegate);

Now the problem is that the list is not sorted, and I've debugged it to see that the function filterAcceptsRow is called but lessThan NOT!
I've tried to read the Qt source, but not much luck there as I get lost when some signal is fired.
Please help, I wonder where I missed some decoration to make it work properly...

[krix]

apparently it was the QListView that didn't have the sort method implemented, so I had to call the sort method manually after assigning the model.

    m_listview->setModel(proxy);
    m_listview->model()->sort(0);

[divanov]

Note that you are calling sort method of a model, so problem is not connected to QListView in any imaginable way.

[krix]

Well, the filtering and sorting happens when the model is being assigned to the view, so I guess it is connected to the view in some way?
As I compared the functionality of the QListView with i.e. QTreeView, I've noticed there is a function

void sortByColumn(int column, Qt::SortOrder order);

in the latter. This was my guess that maybe it's because of QListView.


On the other hand the example from chapter 4 of Beginning Nokia Apps Development: Qt actually uses QListView. The difference is the model that inherits the QStandardItemModel in the example instead of my QAbstractListModel.

Any clue where I could have missed something?

[divanov]

Well, the filtering and sorting happens when the model is being assigned to the view

Sort happens when you call sort method of the model.
http://doc.trolltech.com/4.7/qabstra...odel.html#sort

[krix]

again, by calling

proxy->setDynamicSortFilter(true);

I expect the model to be sorted without manually calling the sort method

[divanov]

This property holds whether the proxy model is dynamically sorted and filtered whenever the contents of the source model change.

[krix]

The contents were filtered automatically but not sorted

Now the problem is that the list is not sorted, and I've debugged it to see that the function filterAcceptsRow is called but lessThan NOT!