[Qt-interest] Does QWidget::setUpdatesEnabled(false) save time

[David Boosalis]

I sometimes populate a listview or tree view with lots of items.  Prior to
the for loop that creates the StandardItems I do a setUpdatesEnabled(false)
and then after the for loop I do a setUpdatesEnabled(true). I recall
starting this methodoloty with Qt3 which relied more on X doing the drawing
and was not double buffered.  My question is does this still apply to QT 4
now that it does its own rendering.  Further more for widgets that Inherit
from a QScrollArea should the ::setUpdatesEnabled() apply to the top window
or to the QScrollArea::widget().

Do Windows, Mac, and Linux also show the same behavior for this kind of
optimization technique (minimize blits to screen).


The reason I ask is that I have lots of Table Widgets with real time data
feeds and I want to make sure I am minimizing a bunch of screen redraws with
one redraw.

Any thoughts  on this is greatly appreciated.

-david
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