[PySide] adding buttons to table view in an efficient manner

[Frank Rueter | OHUfx]

Hi all,

this seems to come up a lot but I still don't have a routine for the 
solution so I wanted to see what other thinks:
Task: write a table view for an unknown amount of rows, and each row 
needs to have a progressbar and two buttons.

The progressbar is covered by a super simple custom paint method that 
just fills the option rectangle (I found using 
/QtGui.QApplication.style().drawControl /was too slow for a large amount 
of rows and causes jerky resizing behaviour).

As for the buttons I am having the view's viewportEvent (event 
type=QtCore.QEvent.Type.Paint) loop over the model's rows, checking each 
row's visualRect() against the viewport.
If the row is currently visible I open a persistent editor for it, 
otherwise I close the persistent editor.

The delegate's createEditor() method takes care of the required 
signal/slot connections.

This seems to work ok, but still seems a bit jerky when resizing a large 
window with lots o rows.

The other approach I am contemplating is to draw rendered buttons as 
pixmaps into the cells and only swap them out for actual buttons on 
mouse over.
I'm sure the latter will make things a lot snappier, so should be worth 
the re-write?!

Does anybody have any input on this?

Cheers,
frank

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