QLineEdit

[bismitapadhy]

I created a QLineEdit.I set inputmask as - 9.
If user is typing any other character other than digit QLineEdit text should not change. How can i do this.

[addu]

use validator

Thanks

Yuvaraj R

[yogeshgokul]

Try:

lineEdit->setInputMask("9999");//Will let you enter 4 digits

lineEdit->setInputMask("9999");//Will let you enter 4 digits

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[faldzip]

QValidator is a better way than input mask. There are currently 3 validators prepared in Qt: QDoubleValidator, QIntValidator, QRegExpValidator.

If you want to validate as the input string is an int you can do it like this (from Qt Assistant):

QValidator *validator = new QIntValidator(100, 999, this);
 QLineEdit *edit = new QLineEdit(this);
 
 // the edit lineedit will only accept integers between 100 and 999
 edit->setValidator(validator);

QValidator *validator = new QIntValidator(100, 999, this);
 QLineEdit *edit = new QLineEdit(this);

 // the edit lineedit will only accept integers between 100 and 999
 edit->setValidator(validator);

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If you want some reg exp validating than:

QRegExp rx("[1-9]\\d{0,3}");
QValidator *validator = new QRegExpValidator(rx, this);
QLineEdit *edit = new QLineEdit(this);
edit->setValidator(validator);

QRegExp rx("[1-9]\\d{0,3}");
QValidator *validator = new QRegExpValidator(rx, this);
QLineEdit *edit = new QLineEdit(this);
edit->setValidator(validator);

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will allow you to input numbers between 1 and 9999;