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# addressbook.cpp Example File
tutorials/addressbook/part2/addressbook.cpp

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     #include <QtGui>
     #include "addressbook.h"

     AddressBook::AddressBook(QWidget *parent)
         : QWidget(parent)
     {
         QLabel *nameLabel = new QLabel(tr("Name:"));
         nameLine = new QLineEdit;
         nameLine->setReadOnly(true);
         QLabel *addressLabel = new QLabel(tr("Address:"));
         addressText = new QTextEdit;
         addressText->setReadOnly(true);

         addButton = new QPushButton(tr("&Add"));
         addButton->show();
         submitButton = new QPushButton(tr("&Submit"));
         submitButton->hide();
         cancelButton = new QPushButton(tr("&Cancel"));
         cancelButton->hide();
         connect(addButton, SIGNAL(clicked()), this, SLOT(addContact()));
         connect(submitButton, SIGNAL(clicked()), this, SLOT(submitContact()));
         connect(cancelButton, SIGNAL(clicked()), this, SLOT(cancel()));
         QVBoxLayout *buttonLayout1 = new QVBoxLayout;
         buttonLayout1->addWidget(addButton, Qt::AlignTop);
         buttonLayout1->addWidget(submitButton);
         buttonLayout1->addWidget(cancelButton);
         buttonLayout1->addStretch();
         QGridLayout *mainLayout = new QGridLayout;
         mainLayout->addWidget(nameLabel, 0, 0);
         mainLayout->addWidget(nameLine, 0, 1);
         mainLayout->addWidget(addressLabel, 1, 0, Qt::AlignTop);
         mainLayout->addWidget(addressText, 1, 1);
         mainLayout->addLayout(buttonLayout1, 1, 2);
         setLayout(mainLayout);
         setWindowTitle(tr("Simple Address Book"));
     }
     void AddressBook::addContact()
     {
         oldName = nameLine->text();
         oldAddress = addressText->toPlainText();

         nameLine->clear();
         addressText->clear();

         nameLine->setReadOnly(false);
         nameLine->setFocus(Qt::OtherFocusReason);
         addressText->setReadOnly(false);

         addButton->setEnabled(false);
         submitButton->show();
         cancelButton->show();
     }

     void AddressBook::submitContact()
     {
         QString name = nameLine->text();
         QString address = addressText->toPlainText();

         if (name == "" || address == "") {
             QMessageBox::information(this, tr("Empty Field"),
                 tr("Please enter a name and address."));
             return;
         }
         if (!contacts.contains(name)) {
             contacts.insert(name, address);
             QMessageBox::information(this, tr("Add Successful"),
                 tr("\"%1\" has been added to your address book.").arg(name));
         } else {
             QMessageBox::information(this, tr("Add Unsuccessful"),
                 tr("Sorry, \"%1\" is already in your address book.").arg(name));
             return;
         }
         if (contacts.isEmpty()) {
             nameLine->clear();
             addressText->clear();
         }

         nameLine->setReadOnly(true);
         addressText->setReadOnly(true);
         addButton->setEnabled(true);
         submitButton->hide();
         cancelButton->hide();
     }
     void AddressBook::cancel()
     {
         nameLine->setText(oldName);
         nameLine->setReadOnly(true);

         addressText->setText(oldAddress);
         addressText->setReadOnly(true);

         addButton->setEnabled(true);
         submitButton->hide();
         cancelButton->hide();
     }