[Solved]how to use QDoubleValidator?
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Dear all,
i'm trying to 4 1/2 digit display of the multimeter. it should only display between -19999 to +19999.
I tried using QDoubleValidator as
@ QDoubleValidator *validate=new QDoubleValidator(this);
validate->setBottom(-19999);
validate->setTop(19999);
validate->setNotation(QDoubleValidator::StandardNotation);
ui->lineEdit->setValidator(validate);@but it shows the range between -99999 to +99999
also i tried
@ QRegExp rx("[0-9]\d{0,4}");
ui->lineEdit->setValidator(new QRegExpValidator (rx, this));@but it shows only between 0 to 99999.
kindly anybody can solve it?
[Edit: You only need an @ at the beginning and end of your code blocks, not every line. Cleaned up code -- mlong]
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If I recall correctly, I believe that the validator will only check input typed at the keyboard. If you're trying to set the value through code, the validator won't stop you from doing so.
I wouldn't recommend using a QLineEdit as a display-only widget, which it sounds like you're doing. Consider a QLabel.
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Sorry for delay reply...
Can we control value in QLabel?
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It depends on how you mean value. You have setText() method in label class. You set number by doing so:
@myLabel->setText(QString::number(value));@If you want value back to number, you only call:
@myLabel->text().toDouble();@If you want to limit user input by value, you'll have to derive QValidator or QDoubleValidator, or you can use QDoubleSpinBox widget, which already has this built in.
Regards,
Jake
