[PyKDE] RE: Strange QTable behavior

[Jim Bublitz]

On 14-Dec-01 "Tomaz Ficko"
<tomaz.ficko at agroruse.si>pykde-admin at mats.gmd.de wrote:

> I'm writing a dictionary like application with PyQt. I'm using
> QTable widget to display the data in a table with two columns.
> But there is a problem, when I set number of rows to more than
> 1638 and fill all cells with QTableItems the contents of the
> table become blank no grid, no nothing. If I double click a cell
> then the text becomes visible. So the QTableItems are
> there they are just not visible.  I have tried to use update,
> repaint method, and updateCell method but nothing helps.

> Is this bug or feature? Has somebody else noticed similar
> behavior?

> I want to be able to display 50000 rows in table, which widget
> should I use?

This is probably an "I don't know what I'm talking about, but I'll
answer anyway" reply. I developed a similar application using Qt
(but with C++) a while ago, the major difference being I had
millions of lines to display, so developed my own widget to page
the data. I know I had similar problems however, and I believe I
traced it to a problem with "setUpdatesEnabled" and the related
logic. 

I think it's something like Qt doesn't always set a related flag
correctly. Looking at my code quickly, I just used the widget's
repaint() method. When loading the table, I believe I turned off
updates until done, and then turned them on and repainted but had
to make sure to enable updates before repainting (or maybe do
something else). I don't think I can find the point(s) in the code
where this all happens in less than a few hours - sorry.

Maybe take a look at what the event handling for doubleclicking
does to make the cell appear, and then do that explicitly in code
for the entire table. 

Jim