How to force a style sheet recalculation

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Hi Steve,
That is "One way" to my knowledge .. and even I'm not sure if that is the ONLY way :)
Request if any Troll can clarify better ...
br
chetan

ogoffart

IIRC, calling buton->setStyleSheet("/* /"); should be enough to clear the caches for this widget and force a recomputation of the style.
(Notice "/ */" and not "" in order to avoid an empty stylesheet that would be ignored)

? This user is from outside of this forum

Hi Olivier, setStyleSheet line doesn't compile. It expects a string and if I convert it to regular quotes, the stylesheet is cleared.

ogoffart

"/* /" is a comment inside Quotes, that is, a string containing a comment. QString("/ */")

andre

[quote author="SteveKing" date="1287412881"]Andre: I think the property emits a signal, but I'll have a look at that and see if adding the signal makes any difference. I guess it wouldn't.[/quote]
I fear so too, but you'd say that in an ideal world, it should. Also, I think it would be perfectly possible to do. If the rendering of a widget depends on a property, then a change of that property should, IMHO, cause a trigger to see if a re-render is needed. Just like hovering, getting focus etc. do. As long as there is a signal for the property change, this should be possible. Having to re-set the style sheet is a hackish workaround, IMHO.

andre

I created a bugreport suggesting that property changes should trigger an update of the styling automatically: "http://bugreports.qt.nokia.com/browse/QTBUG-14601":http://bugreports.qt.nokia.com/browse/QTBUG-14601

[edit: fixed link / chetankjain]

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!