random color and lineedit

hi
i has a button and a lineedit .
how do i change color lineedit per click ?

Quick way to be use stylesheets.

You can also change palette of the lineedit.

How do i do this? :(

Code:

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void MainWindow::on_pushButton_clicked()
{
 
    QString stirng = ui->lineEdit->text();
    QString one , two , three , four ;
 
    one = "color : red" ;
    two = "color : pink" ;
    three = "color : green" ;
    four = "color : violet" ;
 
 
    if(stirng != '\0')
    {
        ui->lineEdit_2->setText(stirng);
        if(i==1)
        {
            ui->lineEdit_2->setStyleSheet(one);
            i++;
        }
        else if(i==2)
        {
            ui->lineEdit_2->setStyleSheet(two);
            i++;
        }
         else if(i==3)
        {
            ui->lineEdit_2->setStyleSheet(three);
            i++;
        }
         else
        {
            ui->lineEdit_2->setStyleSheet(four);
            i = 1 ;
        }
    }
}
 
int MainWindow::i = 1 ;

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But not useful :(

What happens when you single-step through this code in your debugger? What do you think line 13 does?

Quote:

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What do you think line 13 does?

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When the user does not enter a string in qlineedit1 :-?

Attachment 8898

use isEmpty() to check the LineEdit text
ex:

Code:

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if( !stirng.isEmpty())
{
.............
}

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