Prevent Enter key from clear my text in QLineEdit

[lansing]

I have a QLineEdit where user will enter numbers and I will have a slot to catch the editingFinished signal when something has been entered. I want the number to stay and prevent user from clearing the text box on pressing the Enter key.

[mrjj]

Hi
So when user press enter he is not allowed to edit the text anymore?
You could just set it to ReadOnly.

[lansing]

@mrjj They can edit, I just don't want to the text to disappear after enter.

[mrjj]

@lansing
But i just tested one QPlainEdit.LineEdit
Mine does not clear the text pressing enter.. ?

[lansing]

@mrjj said in Prevent Enter key from clear my text in QLineEdit:

QPlainEdit

I'm using QLineEdit, not QPlainEdit. I have set a QDoubleValidator to limit the range to 0-120. When I enter 150 and pressed enter, the text remain, but when I entered 10, the text was cleared.

[mrjj]

Yep my bad i did mean LineEdit.

Can you show how you set it up ?

update:
i tried with
QDoubleValidator *myDblVal = new QDoubleValidator(0, 120, 2, this);
ui->lineEdit->setValidator(myDblVal);
and i cant get it to clear the text so not sure why yours does.

[lansing]

@mrjj

I have set the lineEdit default to readonly in the ui, and unlock it only when mode is equal to 1 set somewhere in the file.

// at the top
connect(m_ui.myLineEdit, &QLineEdit::editingFinished,
        this, &MyDiag::slotSetNumber);

// somewhere below
void MyDiag::slotSetNumber() {
    if (!m_ui.myLineEdit->isReadOnly()) {    
        m_ui.myLineEdit->setReadOnly(true);
    }

    if (mode === 1) {
        m_ui.myLineEdit->setReadOnly(false);
        numText = QVariant(30).toString();
    }

    m_ui.myLineEdit->setText(numText);
}

[mrjj]

@lansing

Hi
I was wondering if mode is not 1 then
you call
m_ui.myLineEdit->setText(numText);
anyway and if numText is empty at that point in time, the lineEdit will be empty.

Could it be something like that `?

[lansing]

@mrjj

I edited the first if statement on last post, it should be if (!something) with the "!" in front.

The mode if statement does passed because I won't be able to type into it if it's false.

[mrjj]

Hi
But are you sure
m_ui.myLineEdit->setText(numText);
not sets empty text ?

You could try

if (!numText.isEmpty())
m_ui.myLineEdit->setText(numText);

and see. else i have no guesses on why text is cleared.

[lansing]

@mrjj

Oh you're right, I just double checked, the numText line was wrote outside the mode if statement, moving it back inside the if statement solved it.