QComboBox LineEdit crashing

Reghu_Att

Hello,
I'm trying to set the alignment in my QComboBox line edit field.

#include <QComboBox>
#include <QLineEdit>
ui->cmbTest->lineEdit()->setAlignment(Qt::AlignHCenter);

I found out that the function:

ui->cmbTest->lineEdit();

Was actually returning a null pointer. That is when I do this:

QLineEdit *tmp = ui->cmbTest->lineEdit();

tmp = NULL

What am I doing wrong?

Thank you.

JonB

@Reghu_Att
Read the docs! :)

https://doc.qt.io/qt-5/qcombobox.html#lineEdit

Returns the line edit used to edit items in the combobox, or nullptr if there is no line edit.

Only editable combo boxes have a line edit.

https://doc.qt.io/qt-5/qcombobox.html#editable-prop

This property holds whether the combo box can be edited by the user

By default, this property is false. The effect of editing depends on the insert policy.

(So, to be clear, if you have not gone ui->cmbTest->setEditable(true) you won't have a line edit!)

Reghu_Att

@jonb

Hello. Thanks for the response.
I ended up making the combo boxes editable in QtCreator and then doing this:

ui->cmbTest->lineEdit()->setReadOnly(true);
ui->cmbTest->lineEdit()->setAlignment(Qt::AlignHCenter);

Regards.