Assigning LineEdit input value to a variable

FamaFrench

Okay, here's what I'm attempting to accomplish.

1.Have the user enter a value into a QLineEdit object (Float only)

2.Save that input to a variable

My problem:

         1.is editingFinished(); an appropriate function for saving input in LineEdit box?

So far, my code is:

void MainWindow::on_lineEdit_4_editingFinished()

{ int CouponRate;

QString Coup = ui->CPR->text();

}

(CPR is the object name of the lineedit)

As you can tell, I am quite lost. All help will be greatly appreciated.

mrjj

Hi and welcome to the forums

Well the editingFinished, is emitted when the user press return/enter or simply leave the LineEdit so if that fit how they should use it, its
ok place to do it. ( most use cases fit this use)

void MainWindow::on_lineEdit_4_editingFinished() {
QString Coup = ui->CPR->text();
float CouponRate = Coup.ToFloat(); // get it as float
}

Note that are other ToXX for other types.

Also, note that ToXXX can take a bool to tell if the convert went ok or not.
That can be used to validate user input;

JonB

@FamaFrench said in Assigning LineEdit input value to a variable:

Have the user enter a value into a QLineEdit object (Float only)

What does "Float only" mean? If you mean a floating point value (12.34) you would be best using a QDoubleSpinBox widget, as that will limit.validate input and return the value as a double instead of you doing conversion work.

editingFinished() is a perfectly good signal to use to detect end of editing and ready to save. It is available on QDoubleSpinBox just as much as on QLineEdit.

mrjj

@JonB
Oh I miss the float thing :)
Then converting to an int wont make him happy

JonB

@mrjj
Wait to see, it may not mean that at all! It might be to do with a "floating window", I don't know :)

mrjj

@JonB
Hi
Also if that float is money, he might want to look at QLocale
to get the separators right.