window.cpp Example File

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  #include <QtWidgets>
  #include "window.h"

  Window::Window(QWidget *parent)
      : QWidget(parent)
  {
      setupModel();

      nameLabel = new QLabel(tr("Na&me:"));
      nameEdit = new QLineEdit();
      addressLabel = new QLabel(tr("&Address:"));
      addressEdit = new QTextEdit();
      typeLabel = new QLabel(tr("&Type:"));
      typeComboBox = new QComboBox();
      nextButton = new QPushButton(tr("&Next"));
      previousButton = new QPushButton(tr("&Previous"));

      nameLabel->setBuddy(nameEdit);
      addressLabel->setBuddy(addressEdit);
      typeLabel->setBuddy(typeComboBox);

      typeComboBox->setModel(typeModel);

      mapper = new QDataWidgetMapper(this);
      mapper->setModel(model);
      mapper->addMapping(nameEdit, 0);
      mapper->addMapping(addressEdit, 1);
      mapper->addMapping(typeComboBox, 2, "currentIndex");

      connect(previousButton, &QAbstractButton::clicked,
              mapper, &QDataWidgetMapper::toPrevious);
      connect(nextButton, &QAbstractButton::clicked,
              mapper, &QDataWidgetMapper::toNext);
      connect(mapper, &QDataWidgetMapper::currentIndexChanged,
              this, &Window::updateButtons);

      QGridLayout *layout = new QGridLayout();
      layout->addWidget(nameLabel, 0, 0, 1, 1);
      layout->addWidget(nameEdit, 0, 1, 1, 1);
      layout->addWidget(previousButton, 0, 2, 1, 1);
      layout->addWidget(addressLabel, 1, 0, 1, 1);
      layout->addWidget(addressEdit, 1, 1, 2, 1);
      layout->addWidget(nextButton, 1, 2, 1, 1);
      layout->addWidget(typeLabel, 3, 0, 1, 1);
      layout->addWidget(typeComboBox, 3, 1, 1, 1);
      setLayout(layout);

      setWindowTitle(tr("Delegate Widget Mapper"));
      mapper->toFirst();
  }

  void Window::setupModel()
  {
      QStringList items;
      items << tr("Home") << tr("Work") << tr("Other");
      typeModel = new QStringListModel(items, this);

      model = new QStandardItemModel(5, 3, this);
      QStringList names;
      names << "Alice" << "Bob" << "Carol" << "Donald" << "Emma";
      QStringList addresses;
      addresses << "<qt>123 Main Street<br/>Market Town</qt>"
                << "<qt>PO Box 32<br/>Mail Handling Service"
                   "<br/>Service City</qt>"
                << "<qt>The Lighthouse<br/>Remote Island</qt>"
                << "<qt>47338 Park Avenue<br/>Big City</qt>"
                << "<qt>Research Station<br/>Base Camp<br/>Big Mountain</qt>";

      QStringList types;
      types << "0" << "1" << "2" << "0" << "2";

      for (int row = 0; row < 5; ++row) {
        QStandardItem *item = new QStandardItem(names[row]);
        model->setItem(row, 0, item);
        item = new QStandardItem(addresses[row]);
        model->setItem(row, 1, item);
        item = new QStandardItem(types[row]);
        model->setItem(row, 2, item);
      }
  }

  void Window::updateButtons(int row)
  {
      previousButton->setEnabled(row > 0);
      nextButton->setEnabled(row < model->rowCount() - 1);
  }