QWidget update() / repaint() has no effect

gde23

Hi,

I habe a QTreeView that I want to update when some Icons have changed.

When i call tree->update(); or tree->repaint();nothing happens.
When I instead call

tree->hide();
tree->show();

The Icons are updated as they should. What am I missing?

sierdzio

Most probably your view does not know that anything has changed, so when your call update() it does nothing,

Make sure your underlying model emits dataChanged() when icon changes.

gde23

@sierdzio
dataChanged() is emmited after the Icon change.
However for some reason it needs an additional update here.

I also think that it already worked with an older Qt Version, or I haven't noticed the problem yet.
Currently I am using 5.11

SGaist

Hi,

Since the LTS Qt 5.9.7 just got released, you can test against that one.

Might be a silly question but did you check whether you are emitting dataChanged for the wrong indexe(s) ?

Christian Ehrlicher

Also with the correct index? Can you provide a small example? Does it update when you move the mouse over the modified item?

gde23

Problem solved, the index when emmiting dataChanged() was wrong.
Thanks for the hint