How to enter a character to QLineEdits from QPushButtons depending on the focus in Qt

Question

I am using Qt Creator to make a UI.
UI consists of two or more QLineEdits and ten QPushButtons to input 0-9 numberic characters to QLineEdits. How can I enter 0-9 number strings in both QLineEdits one by one.

If I press QPushButton with label '5'and cursor is on QLineEdit (say QLineEdit 1) it should append '5' in QLineEdit 1 or if QLineEdit 2 is selected it should append '5' in QLineEdit 2 and respectively with the other QPushButtons also.

Answer 1

you could have a slot in your ui class like the following

void MyDialog::numberButtonPressed()
{
    QPushButton* btn = qobject_cast<QPushButton*>(QObject::sender());
    if (!btn)
        return; // TODO error handling
    ui.lineEdit->setText(ui.lineEdit->text() + btn->text());
}

and then QObject::connect all numeric buttons to that slot.

cheers

Answer 2

In QT Creator after adding pushbutton to slots in UI, go to function and check if it has focus or not with hasFocus().

e.g.

void MainWindow::on_pushButton_clicked()
{
    if(ui->lineEdit_1->hasFocus)
    {
        ui->lineEdit_1->setText("your text");
    }
    else if(ui->lineEdit_2->hasFocus)
    {
        ui->lineEdit_2->setText("your text");
    }
}