double validator

#include "dialog.h"
#include "ui_dialog.h"
#include <QMessageBox>
#include <QDoubleValidator>

Dialog::Dialog(QWidget *parent): QDialog(parent), ui(new Ui::Jakolaskin)

{
  ui->setupUi(this);
  ui->pushButton->setEnabled(false);
  //lisätään validaattorit molempiin tekstiruutuihin
  ui->lineEdit->setValidator(new QDoubleValidator(this));
  ui->lineEdit_2->setValidator(new QDoubleValidator(this));
  connect(ui->pushButton,SIGNAL(clicked()),this,SLOT(onLaske()));
  connect(ui->lineEdit,SIGNAL(textChanged(const QString &)),this,SLOT(onTextChanged(const QString &)));
  connect(ui->lineEdit_2,SIGNAL(textChanged(const QString &)),this,SLOT(onTextChanged(const QString &)));
}

Dialog::~Dialog()
{
  delete ui;
}

void Dialog::onLaske()
{
  QMessageBox box;
  bool bOK1, bOK2;
  double value1 = ui->lineEdit->text().toDouble(&bOK1);
  double value2 = ui->lineEdit_2->text().toDouble(&bOK2);
  ui->lineEdit_3->setText("");
  if(bOK1 && bOK2)
  {
    if(value2 != 0)
    {
      double result = value1 / value2;
      ui->lineEdit_3->setText(QString::number(result));
    }
    else
    {
      box.setText("Et voi jakaa nollalla");
      box.exec();
    }
  }
  else
  {
    box.setText("Virheellinen syöte");
    box.exec();
  }
}

void Dialog::onTextChanged(const QString &)
{
  //enabloidaan nappi, jos molemmat syötteet on annettu
  ui->pushButton->setEnabled(ui->lineEdit->text() != "" && ui->lineEdit_2->text()!= "");
}