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# addressbook.cpp Example File
tutorials/addressbook/part4/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"));
         editButton = new QPushButton(tr("&Edit"));
         editButton->setEnabled(false);
         removeButton = new QPushButton(tr("&Remove"));
         removeButton->setEnabled(false);
         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(editButton, SIGNAL(clicked()), this, SLOT(editContact()));
         connect(removeButton, SIGNAL(clicked()), this, SLOT(removeContact()));
         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);
         buttonLayout1->addWidget(editButton);
         buttonLayout1->addWidget(removeButton);
         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();

         updateInterface(AddingMode);
     }
     void AddressBook::editContact()
     {
         oldName = nameLine->text();
         oldAddress = addressText->toPlainText();

         updateInterface(EditingMode);
     }
     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 (currentMode == AddingMode) {

             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;
             }
         } else if (currentMode == EditingMode) {

             if (oldName != name) {
                 if (!contacts.contains(name)) {
                     QMessageBox::information(this, tr("Edit Successful"),
                         tr("\"%1\" has been edited in your address book.").arg(oldName));
                     contacts.remove(oldName);
                     contacts.insert(name, address);
                 } else {
                     QMessageBox::information(this, tr("Edit Unsuccessful"),
                         tr("Sorry, \"%1\" is already in your address book.").arg(name));
                     return;
                 }
             } else if (oldAddress != address) {
                 QMessageBox::information(this, tr("Edit Successful"),
                     tr("\"%1\" has been edited in your address book.").arg(name));
                 contacts[name] = address;
             }
         }

         updateInterface(NavigationMode);
     }

     void AddressBook::cancel()
     {
         nameLine->setText(oldName);
         addressText->setText(oldAddress);
         updateInterface(NavigationMode);
     }
     void AddressBook::removeContact()
     {
         QString name = nameLine->text();
         QString address = addressText->toPlainText();

         if (contacts.contains(name)) {

             int button = QMessageBox::question(this,
                 tr("Confirm Remove"),
                 tr("Are you sure you want to remove \"%1\"?").arg(name),
                 QMessageBox::Yes | QMessageBox::No);

             if (button == QMessageBox::Yes) {

                 previous();
                 contacts.remove(name);

                 QMessageBox::information(this, tr("Remove Successful"),
                     tr("\"%1\" has been removed from your address book.").arg(name));
             }
         }

         updateInterface(NavigationMode);
     }
     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());
     }
     void AddressBook::updateInterface(Mode mode)
     {
         currentMode = mode;

         switch (currentMode) {

         case AddingMode:
         case EditingMode:

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

             addButton->setEnabled(false);
             editButton->setEnabled(false);
             removeButton->setEnabled(false);

             nextButton->setEnabled(false);
             previousButton->setEnabled(false);

             submitButton->show();
             cancelButton->show();
             break;
         case NavigationMode:

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

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

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

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