How to inform a Model/TableView that some data changed?

[Petruza]

Ok I'll try to explain better:

I have a char array that's the underlying data structure.
I've subclassed QAbstractTableModel to act as the model.
I've added a Table view like this:



I have a timer that increments the underlying data, in its [0,0] position.
Right now, when I select a cell, or interact in some way with the table, then the cell's value is updated, because the table view somehow calls the model's data() method.
What I want to achieve is on each timer event, twice per second, the view updates the cell's values on the screen.
So please tell me what object should be the sender, and what signal of it, and what object should be the receiver, and what slot of it.
Or if I can achieve this with just a method call, instead of signals.

Edit:
I tried emitting layoutChanged() from the model, which works ok.
But I'm setting a timer with 0 msec timout and all I get is the signal emitted no more than 30 times per second, I need something faster.

Can't I just inform the view to update exactly the cell I know has changed?
I tried with the signal QAbstractItemModel::dataChanged, but I can't emit it from a QAbstractTableModel subclass, although it should inherit QAbstractItemModel's members, so what, aren't signals inherited?

[waynew]

What about this?
void QAbstractItemModel::dataChanged ( const QModelIndex & topLeft, const QModelIndex & bottomRight ) [signal]

This signal is emitted whenever the data in an existing item changes.

If the items are of the same parent, the affected ones are those between topLeft and bottomRight inclusive
Then connect the signal to a slot where you view->show to refresh it?

How are you setting the model to the data? Seems like all you should have to do is re-run that code on the timer and the model/view signal slot will do what you want without further code.

[saa7_go]

Can't I just inform the view to update exactly the cell I know has changed?
I tried with the signal QAbstractItemModel::dataChanged, but I can't emit it from a QAbstractTableModel subclass, although it should inherit QAbstractItemModel's members, so what, aren't signals inherited?

You should emit QAbstractItemModel::dataChanged() signal inside QAbstractItemModel::setData() function.

So, how do you implement QAbstractItemModel::setData() function in your custom model?

For more informations about model subclassing, you can look at Model Subclassing Reference.