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"));

      editButton = new QPushButton(tr("&Edit"));
      editButton->setEnabled(false);
      removeButton = new QPushButton(tr("&Remove"));
      removeButton->setEnabled(false);
      findButton = new QPushButton(tr("&Find"));
      findButton->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);

      loadButton = new QPushButton(tr("&Load..."));
      loadButton->setToolTip(tr("Load contacts from a file"));
      saveButton = new QPushButton(tr("&Save..."));
      saveButton->setToolTip(tr("Save contacts to a file"));
      saveButton->setEnabled(false);

      dialog = new FindDialog(this);

      connect(addButton, SIGNAL(clicked()), this, SLOT(addContact()));
      connect(submitButton, SIGNAL(clicked()), this, SLOT(submitContact()));
      connect(editButton, SIGNAL(clicked()), this, SLOT(editContact()));
      connect(cancelButton, SIGNAL(clicked()), this, SLOT(cancel()));
      connect(removeButton, SIGNAL(clicked()), this, SLOT(removeContact()));
      connect(findButton, SIGNAL(clicked()), this, SLOT(findContact()));
      connect(nextButton, SIGNAL(clicked()), this, SLOT(next()));
      connect(previousButton, SIGNAL(clicked()), this, SLOT(previous()));
      connect(loadButton, SIGNAL(clicked()), this, SLOT(loadFromFile()));
      connect(saveButton, SIGNAL(clicked()), this, SLOT(saveToFile()));

      QVBoxLayout *buttonLayout1 = new QVBoxLayout;
      buttonLayout1->addWidget(addButton);
      buttonLayout1->addWidget(editButton);
      buttonLayout1->addWidget(removeButton);
      buttonLayout1->addWidget(findButton);
      buttonLayout1->addWidget(submitButton);
      buttonLayout1->addWidget(cancelButton);
      buttonLayout1->addWidget(loadButton);
      buttonLayout1->addWidget(saveButton);
      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();

      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.isEmpty() || address.isEmpty()) {
          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));
          }
      } 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));
              }
          } 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::findContact()
  {
      dialog->show();

      if (dialog->exec() == 1) {
          QString contactName = dialog->getFindText();

          if (contacts.contains(contactName)) {
              nameLine->setText(contactName);
              addressText->setText(contacts.value(contactName));
          } else {
              QMessageBox::information(this, tr("Contact Not Found"),
                  tr("Sorry, \"%1\" is not in your address book.").arg(contactName));
              return;
          }
      }

      updateInterface(NavigationMode);
  }

  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();

          loadButton->setEnabled(false);
          saveButton->setEnabled(false);
          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);
          findButton->setEnabled(number > 2);
          nextButton->setEnabled(number > 1);
          previousButton->setEnabled(number > 1);

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

          loadButton->setEnabled(true);
          saveButton->setEnabled(number >= 1);
          break;
      }
  }

  void AddressBook::saveToFile()
  {
      QString fileName = QFileDialog::getSaveFileName(this,
          tr("Save Address Book"), "",
          tr("Address Book (*.abk);;All Files (*)"));

      if (fileName.isEmpty())
          return;
      else {
          QFile file(fileName);
          if (!file.open(QIODevice::WriteOnly)) {
              QMessageBox::information(this, tr("Unable to open file"),
                  file.errorString());
              return;
          }

          QDataStream out(&file);
          out.setVersion(QDataStream::Qt_4_5);
          out << contacts;
      }
  }

  void AddressBook::loadFromFile()
  {
      QString fileName = QFileDialog::getOpenFileName(this,
          tr("Open Address Book"), "",
          tr("Address Book (*.abk);;All Files (*)"));

      if (fileName.isEmpty())
          return;
      else {

          QFile file(fileName);

          if (!file.open(QIODevice::ReadOnly)) {
              QMessageBox::information(this, tr("Unable to open file"),
                  file.errorString());
              return;
          }

          QDataStream in(&file);
          in.setVersion(QDataStream::Qt_4_5);
          contacts.clear();   // clear existing contacts
          in >> contacts;

          if (contacts.isEmpty()) {
              QMessageBox::information(this, tr("No contacts in file"),
                  tr("The file you are attempting to open contains no contacts."));
          } else {
              QMap<QString, QString>::iterator i = contacts.begin();
              nameLine->setText(i.key());
              addressText->setText(i.value());
          }
      }

      updateInterface(NavigationMode);
  }