QLineEdit to accept only one character/digit

Question

I want to have a QLineEdit that accepts only a character or digit . Is there a possibility to set it like in html an input to have a maxlength ? I mean to do this from the constructor of QLineEdit ?

I don't need something complicated ...

score 4 · Accepted Answer · answered Jun 10 '14 at 21:01

4

Everything is exactly like you wanted it to be. QLineEdit has the maxLength property. You set it either using the property system, or using the setter method:

QLineEdit le;
le.setMaxLength(1);

That's it.

answered Jun 10 '14 at 21:01

Kuba hasn't forgotten Monica

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Gluttton · Answer 2 · 2014-06-10T19:47:22.097

3

I don't need someting complicated ...

Unfortunately, it's couldn't be called easy solution, but you should be advised about QRegExpValidator.

Usage example:

#include <QRegExpValidaor>
#include <QLineEdit>
...
...
QRegExp rx ("\\w");
QRegExpValidator * v = new QRegExpValidator (rx, this);
QLineEdit * le = new QLineEdit (this);
le->setValidator (v);

edited Jun 10 '14 at 19:47

answered Jun 10 '14 at 19:18

Gluttton

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I hoped there was a way to reduce the space of writting in the QLineEdit ... it seemed more elegant. – user3009269 Jun 10 '14 at 19:22
I'm not very familiar with Qt, so may be more elegant way exists. – Gluttton Jun 10 '14 at 19:32
Thank you for the usage example ! If I won't find any other way,I'll use it. – user3009269 Jun 10 '14 at 19:37

score 3 · Answer 3 · answered Jun 10 '14 at 20:17

3

Here is the alternate way to limit line edit input to one character/digit:

QLineEdit le;
le.setInputMask("N");
le.show();

For more details on input mask usage refer to the Qt documentation.

answered Jun 10 '14 at 20:17

vahancho

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QLineEdit to accept only one character/digit

3 Answers3