QLineEdit with QDoubleValidator not emitting editingFinished() when e.g. 1,2 insted of 1.2 is entered

gde23

Hello,
Title says it all. I've got a QLineEdit with a QDoubleValidator:

my_lineedit->setValidator(new QDoubleValidator(-DOUBLE_INF, DOUBLE_INF, 10, my_lineedit));

Now when I enter a number with a point ( . ) as decimal point editing finished is emitted and everything works fine.
However if I enter a comma ( , ) as decimal point the value seems to get accepted. but editing finished is not emitted.
Why is that. The behavior I want is that the user can enter either a comma or point as they like.

JonB

@gde23 said in QLineEdit with QDoubleValidator not emitting editingFinished() when e.g. 1,2 insted of 1.2 is entered:

Why is that.

Because comma is not a decimal point, it's a thousand-separator, in your locale. 1.2 is a full floating point number, 1,2 is not.

The behavior I want is that the user can enter either a comma or point as they like.

I don't think Qt offers "alternatives" for decimal point in a locale --- unless someone knows of one which does.

See https://forum.qt.io/topic/67850/disable-comma-in-qdoublevalidator for thoughts.

As @SGaist says there, why are you using a QLineEdit to enter a number when there is a QDoubleSpinBox for floating point number entry and handling text<->number conversions? See also https://stackoverflow.com/questions/42534378/c-qt-creator-how-to-have-dot-and-comma-as-decimal-separator-on-a-qdoubles.
You could combine aspects of each of the answers there. E.g. maybe you want QLocale::setNumberOptions(QLocale::RejectGroupSeparator), maybe you want to either reject , or perhaps change it to .. Or try a conversion in two locales, one of which accepts comma as decimal point and another with accepts dot/period.

Pl45m4

@gde23

My only thought about this is building your own QDoubleValidator subclass and handle the validation yourself, by using two different locale versions. One that uses comma and one with a dot.
Don't know if that works.