How to change color border QComboBox only?

[J.Hilk]

@vinh not surprising, you have with that overwritten all default stylesheet settings and only specified an universal border

take a look at this extensive stylesheet example, what else you can modify in combination with what selector

https://doc.qt.io/qt-5/stylesheet-examples.html#customizing-qcombobox

[vinh]

@J-Hilk tks, I'm try

combobox->setStyleSheet( "QComboBox {border: 1px solid red;}" );

but it set all, what is correct syntax?

[SGaist]

Hi,

When you use style sheets you have to do the complete styling. Style sheets ignores the original style used to draw the controls.

[vinh]

@SGaist So is there any other way? full styling is unnecessary for only border color.

[SGaist]

Depending on what you want to use that border color for you could consider using a QRubberBand.

[mrjj]

Hi
You could also put the QComboBox in a QFrame+layout.
(set all margins on layout to zero)

[vinh]

@mrjj yes, I have formLayout and I'm try set margin 0px but it not work.

[mrjj]

@vinh
Ok I used a horizontal layout.
and sat all these to zero

[vinh]

@mrjj thank you very much, but QComboBox is change size and icon down-row, css on Qt not support custom only property :( I think

[mrjj]

@vinh
Hi
Make sure to set the style sheet on the QFrame (ONLY)
and change it so it says
"QFrame {border: 1px solid red;}"

So you don't affect the Combobox inside. but only the QFrame.

So no stylesheet on Combobox but only on QFrame.