How to set QComboBox background color on drop down state?

Question

I can change QComboBox color like this:

QPalette palette = ui->selectSource->palette();
palette.setColor(QPalette::Active, QPalette::Button, Qt::white);
palette.setColor(QPalette::Inactive, QPalette::Button, Qt::white);
ui->selectSource->setPalette(palette);

It becomes white, but when its in drop down state it still have some gray color (default).

How to change this?

Maybe apply the same palette to combo box's drop down view too? You can get it with `QComboBox::view()` function. — vahancho, Dec 09 '14 at 08:27
@vahancho, it must be "QPalette::Background" for the view. Please, fix your answer — , Dec 09 '14 at 08:54

score 0 · Answer 1 · answered Dec 09 '14 at 08:27

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You should also set QPalette::Base role. Quote from the Qt documentation about QPalette::Base :

Used mostly as the background color for text entry widgets, but can also be used for other painting - such as the background of combobox drop down lists and toolbar handles. It is usually white or another light color.

So you should also have :

palette.setColor(QPalette::Base, Qt::white);

answered Dec 09 '14 at 08:27

Nejat

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That's weird. It works for me both on Linux and Windows. – Nejat Dec 09 '14 at 08:40
@Tay2510, now that's weird for me, cause "palette.setColor(QPalette::Base, Qt::white);" do nothing in my code. Maybe some other property of my main window is different or I miss something. – Dec 09 '14 at 09:00

score 0 · Accepted Answer · edited Dec 09 '14 at 09:22

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You could apply one more palette to the combo box's drop down view too. To get the pointer to the drop down view you can use the QComboBox::view() function. So, your code will look like:

QPalette palette = ui->selectSource->palette();
palette.setColor(QPalette::Active, QPalette::Button, Qt::white);
palette.setColor(QPalette::Inactive, QPalette::Button, Qt::white);

QPalette view_palette = ui->selectSource->view()->palette();
view_palette.setColor(QPalette::Active, QPalette::Background, Qt::white);
ui->selectSource->view()->setPalette(view_palette);

edited Dec 09 '14 at 09:22

answered Dec 09 '14 at 08:48

vahancho

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Strange, this code doesn't work for me but Nejat's code does. I am so confused...0rz – Tay2510 Dec 09 '14 at 09:39
@Tay2510, I'm using Qt v5.3.x. You? – Dec 10 '14 at 14:01
@AlekDepler Qt 4.8.6 with Windows 7 32bit. – Tay2510 Dec 11 '14 at 02:12

How to set QComboBox background color on drop down state?

2 Answers2