addressbook.cpp Example File

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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, 2, 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.isEmpty() || address.isEmpty()) {
         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));
     }

     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());
 }