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-   -   QT - My way to force numeric input (https://talk.maemo.org/showthread.php?t=44616)

shep 2010-02-15 22:15
QT - My way to force numeric input
 
This is probably lame, but I thought I'd share my method for making a lineEdit into a numeric only input.

Code:
void MainWindow::on_lineEdit_textChanged(QString )
{
    QString qNewValue = ui->lineEdit->text();
    bool ok;
    double dTest = qNewValue.toDouble(&ok);
    int dotCnt=0;
    if (!ok)
    {
        QString qStripped;

        for (int i=0; i< qNewValue.length(); i++ )
        {
            QString subStr = qNewValue.at(i);
            QString sValid = "1234567890.";
            if (subStr.toLower() == ":")
            {
                subStr = ".";
            }
            if (subStr.toLower() == "?")
            {
                subStr = ".";
            }

            if (subStr==".")
            {
                dotCnt++;
            }
            if (subStr.toLower() == "q")
            {
                subStr = "1";
            }
            if (subStr.toLower() == "w")
            {
                subStr = "2";
            }
            if (subStr.toLower() == "e")
            {
                subStr = "3";
            }
            if (subStr.toLower() == "r")
            {
                subStr = "4";
            }
            if (subStr.toLower() == "t")
            {
                subStr = "5";
            }
            if (subStr.toLower() == "y")
            {
                subStr = "6";
            }
            if (subStr.toLower() == "u")
            {
                subStr = "7";
            }
            if (subStr.toLower() == "i")
            {
                subStr = "8";
            }
            if (subStr.toLower() == "o")
            {
                subStr = "9";
            }
            if (subStr.toLower() == "p")
            {
                subStr = "0";
            }
            if ( (sValid.contains( subStr)) && (dotCnt <= 1))
            {
                qStripped.append(subStr);
            }
        }
        ui->lineEdit->setText(qStripped);
    }

}
Hopes this helps someone.

b666m 2010-02-15 22:17
Re: QT - My way to force numeric input
 
set your code into the code-tag [.code] [./code] (of course without the . ) :)

shep 2010-02-15 22:21
Re: QT - My way to force numeric input
 
Quote:
Originally Posted by b666m (Post 528336)
set your code into the code-tag [.code] [./code] (of course without the . ) :)
Done, thanks!

qwerty12 2010-02-15 22:30
Re: QT - My way to force numeric input
 
What about ze Germans with their QWERTZ keyboards? (Being qwerty12, I have to boo at the Germans for using the QWERTZ layout on their keyboards anyway, but... :p)

w00t 2010-02-15 22:31
Re: QT - My way to force numeric input
 
I'd suggest looking at:

http://doc.trolltech.com/4.6/qwidget...thodHints-prop

and

http://doc.trolltech.com/4.6/qlineed...inputMask-prop

and

http://doc.trolltech.com/4.6/qlineed...l#setValidator

Hope this helps.

shep 2010-02-15 22:40
Re: QT - My way to force numeric input
 
Quote:
Originally Posted by qwerty12 (Post 528355)
What about ze Germans with their QWERTZ keyboards? (Being qwerty12, I have to boo at the Germans for using the QWERTZ layout on their keyboards anyway, but... :p)
I did say it sucked :p

If you forget about the qwertyuiop to 1234567890 translation then the basic principle is sound! Just did the translation for lazy old me.

Shep

shep 2010-02-15 22:42
Re: QT - My way to force numeric input
 
Quote:
Originally Posted by w00t (Post 528356)
I'd suggest looking at...
Thanks woot, unfortunately the inputHints don't work using Madde at the moment :( that's why I went looking for an alt in the first place.

Thanks for the tips though

w00t 2010-02-15 23:46
Re: QT - My way to force numeric input
 
Quote:
Originally Posted by shep (Post 528377)
Thanks woot, unfortunately the inputHints don't work using Madde at the moment :( that's why I went looking for an alt in the first place.

Thanks for the tips though
Ah. Yeah, they're new to Qt 4.6, and MADDE has 4.5 at the moment... *but*, input hints are only for the virtual keyboard. The actual restriction of input can be done through validators :)


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