contactmodel.cpp Example File

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 #include "contactmodel.h"

 ContactModel::ContactModel(QObject *parent ) : QAbstractListModel(parent)
 {
     m_contacts.append({ "Angel Hogan", "Chapel St. 368 ", "Clearwater" , "0311 1823993" });
     m_contacts.append({ "Felicia Patton", "Annadale Lane 2", "Knoxville" , "0368 1244494" });
     m_contacts.append({ "Grant Crawford", "Windsor Drive 34", "Riverdale" , "0351 7826892" });
     m_contacts.append({ "Gretchen Little", "Sunset Drive 348", "Virginia Beach" , "0343 1234991" });
     m_contacts.append({ "Geoffrey Richards", "University Lane 54", "Trussville" , "0423 2144944" });
     m_contacts.append({ "Henrietta Chavez", "Via Volto San Luca 3", "Piobesi Torinese" , "0399 2826994" });
     m_contacts.append({ "Harvey Chandler", "North Squaw Creek 11", "Madisonville" , "0343 1244492" });
     m_contacts.append({ "Miguel Gomez", "Wild Rose Street 13", "Trussville" , "0343 9826996" });
     m_contacts.append({ "Norma Rodriguez", " Glen Eagles Street  53", "Buffalo" , "0241 5826596" });
     m_contacts.append({ "Shelia Ramirez", "East Miller Ave 68", "Pickerington" , "0346 4844556" });
     m_contacts.append({ "Stephanie Moss", "Piazza Trieste e Trento 77", "Roata Chiusani" , "0363 0510490" });
 }

 int ContactModel::rowCount(const QModelIndex &) const
 {
     return m_contacts.count();
 }

 QVariant ContactModel::data(const QModelIndex &index, int role) const
 {
     if (index.row() < rowCount())
         switch (role) {
         case FullNameRole: return m_contacts.at(index.row()).fullName;
         case AddressRole: return m_contacts.at(index.row()).address;
         case CityRole: return m_contacts.at(index.row()).city;
         case NumberRole: return m_contacts.at(index.row()).number;
         default: return QVariant();
     }
     return QVariant();
 }

 QHash<int, QByteArray> ContactModel::roleNames() const
 {
     static const QHash<int, QByteArray> roles {
         { FullNameRole, "fullName" },
         { AddressRole, "address" },
         { CityRole, "city" },
         { NumberRole, "number" }
     };
     return roles;
 }

 QVariantMap ContactModel::get(int row) const
 {
     const Contact contact = m_contacts.value(row);
     return { {"fullName", contact.fullName}, {"address", contact.address}, {"city", contact.city}, {"number", contact.number} };
 }

 void ContactModel::append(const QString &fullName, const QString &address, const QString &city, const QString &number)
 {
     int row = 0;
     while (row < m_contacts.count() && fullName > m_contacts.at(row).fullName)
         ++row;
     beginInsertRows(QModelIndex(), row, row);
     m_contacts.insert(row, {fullName, address, city, number});
     endInsertRows();
 }

 void ContactModel::set(int row, const QString &fullName, const QString &address, const QString &city, const QString &number)
 {
     if (row < 0 || row >= m_contacts.count())
         return;

     m_contacts.replace(row, { fullName, address, city, number });
     dataChanged(index(row, 0), index(row, 0), { FullNameRole, AddressRole, CityRole, NumberRole });
 }

 void ContactModel::remove(int row)
 {
     if (row < 0 || row >= m_contacts.count())
         return;

     beginRemoveRows(QModelIndex(), row, row);
     m_contacts.removeAt(row);
     endRemoveRows();
 }