addressbook.cpp Example File

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  #include <QtWidgets>
  #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());
  }