How to force a style sheet recalculation

genjix

wait, so there's no way to do style changes for hover/selecting a button? There should be :p

DenisKormalev

genjix, for hovering or clicking on a button there are pseudo-states in stylesheets.

andre

Just for reference:
"http://developer.qt.nokia.com/faq/answer/how_can_my_stylesheet_account_for_custom_properties":http://developer.qt.nokia.com/faq/answer/how_can_my_stylesheet_account_for_custom_properties.

Here it is indicated that using a unpolish()/polish() pair of calls would be the fastest way to force the update.

andre

When first being classified as "a sensible idea" and asking for more info, the JIRA ticket has now been closed as "Out of scope" because Qt is "more focussed on QML than in widgets" now.

I read in that: f*ck everybody who invested hundreds or thousands of developer hours into widget based applications; everybody who is not immediately jumping onto the immature Quick bandwagon is screwed.

I am really disapointed by this. While I see Quick as a very interesting technology for creating flashy touch UI's, conventional widgets have a huge invested base and do have their advantages. At least it is proven technology. I would have expected to see them live on side by side for quite a while, as there are use cases for both stacks. It seems I was wrong. :-(

karolyi

Coming here after googling, just a quick reply:

meanwhile, QStyle.polish() seems to apply the recomputed style on the change widget.

ODБOï

@karolyi said in How to force a style sheet recalculation:

quick reply

this topic is 8 years old

WolfgangGriech

@ogoffart you're my hero, I had discovered a weird effect on Qt6.9.1 (and later also on some older Qt6 versions), sending an empty or invalid string to setStyleSheet() didn't always clear the previously set stylesheet, but your proposed solution perfectly works, always! Thanks man!

larsmaxfield

The solution from @ogoffart works for me, too.

setStyleSheet() in >6.9.1 doesn't work for me to refresh the stylesheet. I use widget.setStyleSheet(widget.styleSheet()), but that isn't reliable. @WolfgangGriech also describes this.

~~Perhaps this should be reported as bug?~~ It's been reported and fixed for 6.10.

JonB

@larsmaxfield
FWIW, (I believe) I recall in some Qt 5 version years ago in order to get it reliably to count as a change I had to/ended up doing:

temp = widget.styleSheet();
widget.setStyleSheet("");
widget.setStyleSheet(temp);

Pl45m4

@JonB

Maybe even

That might force the style(sheet) to update too.
But usually the widget should do this when a new style(sheet) is applied.