QDialog, editingFinished, and Cancel Button.

[shentian]

I woudn't use the editingFinished signal to validate.

If you want to validate only when the OK button is clicked, do it like this:

MyDialog::MyDialog(QWidget *parent) :
    QDialog(parent),
{
    // ...
    connect(pushButton_OK, SIGNAL(clicked()), this, SLOT(validate()));
    connect(pushButton_Cancel, SIGNAL(clicked()), this, SLOT(reject()));
}
 
void MyDialog::validate()
{
  if (lineEdit->text() != "Valid data")
  {
    QMessageBox::critical(this, tr("Invalid Data"), tr("You entered invalid data"));
    return;
  }
  accept();
}

MyDialog::MyDialog(QWidget *parent) :
    QDialog(parent),
{
    // ...
    connect(pushButton_OK, SIGNAL(clicked()), this, SLOT(validate()));
    connect(pushButton_Cancel, SIGNAL(clicked()), this, SLOT(reject()));
}

void MyDialog::validate()
{
  if (lineEdit->text() != "Valid data")
  {
    QMessageBox::critical(this, tr("Invalid Data"), tr("You entered invalid data"));
    return;
  }
  accept();
}

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