Qt 5.9 | Qt Widgets | Part 3 - Navigating between Entries | addressbook.cpp Example File

Qt 5.9.9 Reference Documentation

# addressbook.cpp Example File

tutorials/addressbook/part3/addressbook.cpp

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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());
      }