White background for QComboBox despite not editable?

olowo726

I have a QComboBox from which the user shall be able to make his/her pick from the available options but not write arbitrary data. To make this happen I set the QComboBox to not editable. But then the background turns grey, i.e. it appears disabled. Is this really intentional or am I doing something wrong? How can I make it appear enabled?

mrjj

Hi
Nope, it draws like that.
When truly disabled, the text is grey also.
But I agree. It does look disabled.

You could do

class ReadOnlyEdit : public QLineEdit
{
    Q_OBJECT
public:
    ReadOnlyEdit(QWidget *parent = nullptr) : QLineEdit(parent) {}
protected:
    virtual void keyPressEvent(QKeyEvent *event) override {} // eats keys
};

(in .cpp)
 ReadOnlyEdit *line = new ReadOnlyEdit(this);
 ui->comboBox->setLineEdit(line);

It does show a cursor, so might not be what you are looking for, though.
But it will show as normal white and allow no editing.

JonB

@mrjj , @olowo726
I haven't investigated any further, but can't you also do this via stylesheet? In the example at https://doc.qt.io/qt-5/stylesheet-examples.html#customizing-qcombobox you can see they are using QComboBox:!editable selector, can that be used to set the background wanted, without having to write code?

mrjj

@JonB

Yes you can ! I just forgot to write it 🙄 :)
The only thing is - that sometimes adding a stylesheet, alters widgets looks.
But as far as I recall, it's ok with QComboBox:!editable without Combobox start looking odd.