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How can I set the backgroud color of a QComboBox in a dropdown state?

I can change the color QComboBox

as follows:

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 turns white, but when it is in the dropdown state, it still has a gray color (default).

How can this be changed?

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2 answers


You can also apply another palette to the combo box dropdown menu. To get a pointer to the dropdown you can use the function QComboBox::view()

. So your code will look like this:



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);
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You must also set the role QPalette::Base

. Quoting from the Qt documentation about QPalette::Base

:

Used primarily as a background color for text input widgets, but can also be used for other coloration - for example, combobox background for comboboxes for dropdowns and toolbar grips. This is usually white or some other light color.



So, you should also have:

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