Address Book Example | Qt Widgets 5.13.0

Qt 5.13 | Qt Widgets | Address Book Example

Qt 5.13.0 Reference Documentation

# Address Book Example

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      #include "addresswidget.h"
      #include "adddialog.h"

      #include <QtWidgets>

      AddressWidget::AddressWidget(QWidget *parent)
          : QTabWidget(parent),
            table(new TableModel(this)),
            newAddressTab(new NewAddressTab(this))
      {
          connect(newAddressTab, &NewAddressTab::sendDetails,
              this, &AddressWidget::addEntry);

          addTab(newAddressTab, tr("Address Book"));

          setupTabs();
      }

      void AddressWidget::showAddEntryDialog()
      {
          AddDialog aDialog;

          if (aDialog.exec())
              addEntry(aDialog.name(), aDialog.address());
      }

      void AddressWidget::addEntry(const QString &name, const QString &address)
      {
          if (!table->getContacts().contains({ name, address })) {
              table->insertRows(0, 1, QModelIndex());

              QModelIndex index = table->index(0, 0, QModelIndex());
              table->setData(index, name, Qt::EditRole);
              index = table->index(0, 1, QModelIndex());
              table->setData(index, address, Qt::EditRole);
              removeTab(indexOf(newAddressTab));
          } else {
              QMessageBox::information(this, tr("Duplicate Name"),
                  tr("The name \"%1\" already exists.").arg(name));
          }
      }

      void AddressWidget::editEntry()
      {
          QTableView *temp = static_cast<QTableView*>(currentWidget());
          QSortFilterProxyModel *proxy = static_cast<QSortFilterProxyModel*>(temp->model());
          QItemSelectionModel *selectionModel = temp->selectionModel();

          const QModelIndexList indexes = selectionModel->selectedRows();
          QString name;
          QString address;
          int row = -1;

          for (const QModelIndex &index : indexes) {
              row = proxy->mapToSource(index).row();
              QModelIndex nameIndex = table->index(row, 0, QModelIndex());
              QVariant varName = table->data(nameIndex, Qt::DisplayRole);
              name = varName.toString();

              QModelIndex addressIndex = table->index(row, 1, QModelIndex());
              QVariant varAddr = table->data(addressIndex, Qt::DisplayRole);
              address = varAddr.toString();
          }

          AddDialog aDialog;
          aDialog.setWindowTitle(tr("Edit a Contact"));
          aDialog.editAddress(name, address);

          if (aDialog.exec()) {
              const QString newAddress = aDialog.address();
              if (newAddress != address) {
                  const QModelIndex index = table->index(row, 1, QModelIndex());
                  table->setData(index, newAddress, Qt::EditRole);
              }
          }
      }

      void AddressWidget::removeEntry()
      {
          QTableView *temp = static_cast<QTableView*>(currentWidget());
          QSortFilterProxyModel *proxy = static_cast<QSortFilterProxyModel*>(temp->model());
          QItemSelectionModel *selectionModel = temp->selectionModel();

          const QModelIndexList indexes = selectionModel->selectedRows();

          for (QModelIndex index : indexes) {
              int row = proxy->mapToSource(index).row();
              table->removeRows(row, 1, QModelIndex());
          }

          if (table->rowCount(QModelIndex()) == 0)
              insertTab(0, newAddressTab, tr("Address Book"));
      }

      void AddressWidget::setupTabs()
      {
          const auto groups = { "ABC", "DEF", "GHI", "JKL", "MNO", "PQR", "STU", "VW", "XYZ" };

          for (const QString &str : groups) {
              const auto regExp = QRegularExpression(QString("^[%1].*").arg(str),
                                                     QRegularExpression::CaseInsensitiveOption);

              auto proxyModel = new QSortFilterProxyModel(this);
              proxyModel->setSourceModel(table);
              proxyModel->setFilterRegularExpression(regExp);
              proxyModel->setFilterKeyColumn(0);

              QTableView *tableView = new QTableView;
              tableView->setModel(proxyModel);
              tableView->setSelectionBehavior(QAbstractItemView::SelectRows);
              tableView->horizontalHeader()->setStretchLastSection(true);
              tableView->verticalHeader()->hide();
              tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);
              tableView->setSelectionMode(QAbstractItemView::SingleSelection);
              tableView->setSortingEnabled(true);

              connect(tableView->selectionModel(), &QItemSelectionModel::selectionChanged,
                      this, &AddressWidget::selectionChanged);

              connect(this, &QTabWidget::currentChanged, this, [this, tableView](int tabIndex) {
                  if (widget(tabIndex) == tableView)
                      emit selectionChanged(tableView->selectionModel()->selection());
              });

              addTab(tableView, str);
          }
      }

      void AddressWidget::readFromFile(const QString &fileName)
      {
          QFile file(fileName);

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

          QVector<Contact> contacts;
          QDataStream in(&file);
          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 {
              for (const auto &contact: qAsConst(contacts))
                  addEntry(contact.name, contact.address);
          }
      }

      void AddressWidget::writeToFile(const QString &fileName)
      {
          QFile file(fileName);

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

          QDataStream out(&file);
          out << table->getContacts();
      }