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# addressbook.cpp Example File
tutorials/addressbook/part3/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();
         nextButton = new QPushButton(tr("&Next"));
         nextButton->setEnabled(false);
         previousButton = new QPushButton(tr("&Previous"));
         previousButton->setEnabled(false);

         connect(addButton, SIGNAL(clicked()), this, SLOT(addContact()));
         connect(submitButton, SIGNAL(clicked()), this, SLOT(submitContact()));
         connect(cancelButton, SIGNAL(clicked()), this, SLOT(cancel()));
         connect(nextButton, SIGNAL(clicked()), this, SLOT(next()));
         connect(previousButton, SIGNAL(clicked()), this, SLOT(previous()));

         QVBoxLayout *buttonLayout1 = new QVBoxLayout;
         buttonLayout1->addWidget(addButton, Qt::AlignTop);
         buttonLayout1->addWidget(submitButton);
         buttonLayout1->addWidget(cancelButton);
         buttonLayout1->addStretch();
         QHBoxLayout *buttonLayout2 = new QHBoxLayout;
         buttonLayout2->addWidget(previousButton);
         buttonLayout2->addWidget(nextButton);
         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);
         mainLayout->addLayout(buttonLayout2, 3, 1);
         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);
         nextButton->setEnabled(false);
         previousButton->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 adderss."));
             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);

         int number = contacts.size();
         nextButton->setEnabled(number > 1);
         previousButton->setEnabled(number > 1);
         submitButton->hide();
         cancelButton->hide();
     }

     void AddressBook::cancel()
     {
         nameLine->setText(oldName);
         addressText->setText(oldAddress);

         if (contacts.isEmpty()) {
             nameLine->clear();
             addressText->clear();
         }

         nameLine->setReadOnly(true);
         addressText->setReadOnly(true);
         addButton->setEnabled(true);

         int number = contacts.size();
         nextButton->setEnabled(number > 1);
         previousButton->setEnabled(number > 1);

         submitButton->hide();
         cancelButton->hide();
     }

     void AddressBook::next()
     {
         QString name = nameLine->text();
         QMap<QString, QString>::iterator i = contacts.find(name);

         if (i != contacts.end())
             i++;

         if (i == contacts.end())
             i = contacts.begin();

         nameLine->setText(i.key());
         addressText->setText(i.value());
     }
     void AddressBook::previous()
     {
         QString name = nameLine->text();
         QMap<QString, QString>::iterator i = contacts.find(name);

         if (i == contacts.end()){
             nameLine->clear();
             addressText->clear();
             return;
         }

         if (i == contacts.begin())
             i = contacts.end();

         i--;
         nameLine->setText(i.key());
         addressText->setText(i.value());
     }