QComboBox palette not working

Engelard

QPalette and QComboBox are included.

QPalette oriPal;  //at the .h file

oriPal = cbBox->palette();
oriPal.setColor(QPalette::Base, Qt::red);

cbBox->setPalette(oriPal);

Here is list of possible roles for every element of widget, you can scroll not so far to the ColorRole.

None of them working in my app except QPalette::Text .

So text of my ComboBox(and it's contains) are possible to change, but anything else - no. Why?

SGaist

Hi,

What version of Qt are you using ?
On what platform ?

Note that the platform is allowed to ignore values of the palette so it might be what is happening.

Engelard

@SGaist said in QComboBox palette not working:

What version of Qt are you using ?

alt text

On what platform ?

Windows 10 Education

mrjj

@Engelard
Hi
That is the Qt version Creator was build with.
The Qt version used to make programs can be very
different. (and you can have multiple version installed)

you can look in Projects
alt text

Engelard

@SGaist said in QComboBox palette not working:

Note that the platform is allowed to ignore values of the palette so it might be what is happening.

Definitely not. Since i mentioned at the beginning that palette of textColors are applied to my ComboBoxes, so that is not igrnoring.

mrjj

@Engelard
Hi
Some platforms QStyle might not use ( as in ignore) some of the roles.
Some roles that worked on linux had no effect in Windows in my app.
http://doc.qt.io/qt-5/style-reference.html

Also, the Qcombobox is actually a view and uses the models role hints which
might not use palette that much for "items"
https://code.woboq.org/qt5/qtbase/src/widgets/widgets/qcombobox.cpp.html

Engelard

@mrjj Frankly i changed all to styleSheets, not such handy, more complex code but working more or less...

mrjj

@Engelard
ok :)
Im not sure what you want to color, but stylesheet works fine as long
one not trying to combine with models roles :)

Engelard

@mrjj said in QComboBox palette not working:

Im not sure what you want to color,

simple BG-color, with palette it would be 2 lines of code, with stylesheet it 6(alot of conversons to each color from QCOlor, then it convert to string, lots of extrawork).

mrjj

@Engelard
You can also do
ui->comboBox->setItemData( 0, QColor( Qt::black ), Qt::BackgroundRole );
ui->comboBox->setItemData( 1, QColor( Qt::red ), Qt::BackgroundRole );
since its uses an (internal) model. and is basically a view like Listview etc.

Engelard

@mrjj said in QComboBox palette not working:

@Engelard
You can also do
ui->comboBox->setItemData( 0, QColor( Qt::black ), Qt::BackgroundRole );
ui->comboBox->setItemData( 1, QColor( Qt::red ), Qt::BackgroundRole );

Hey, that's pretty good!

But it applied only for items inside(which great, will use in future maybe), i still can't find something like ->setData(); so it would be applied for comboBox container it'self.

mrjj

@Engelard
well the roles in the model is only use for items and not for the view
http://doc.qt.io/qt-5/qcombobox.html#view

but it tried your code and it did work for me ??

alt text

Engelard

@mrjj said in QComboBox palette not working:

but it tried your code and it did work for me ??

sorry i don't get that part.

mrjj

@Engelard
Hi

QPalette oriPal;  //at the .h file
oriPal = cbBox->palette();
oriPal.setColor(QPalette::Base, Qt::red);
cbBox->setPalette(oriPal);

did color it red as picture showed.
so it did use QPalette::Base ( Qt 5.11, windows)