Enginio C++ Examples - Image Gallery

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 #include "imagemodel.h"
 #include "qabstractitemmodel.h"
 #include <qjsonvalue.h>
 #include <qjsonobject.h>
 #include <qvariant.h>
 #include <qicon.h>
 #include <QtCore/qdatetime.h>

 ImageModel::ImageModel(QObject *parent)
     : EnginioModel(parent)
 {
     connect(this, SIGNAL(modelReset()), this, SLOT(reset()));
     connect(this, SIGNAL(rowsInserted(QModelIndex,int,int)),
             this, SLOT(updateRows(QModelIndex,int,int)));

     connect(this, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
             this, SLOT(onDataChanged(QModelIndex,QModelIndex)));
 }

 void ImageModel::reset()
 {
     updateRows(QModelIndex(), 0, rowCount() - 1);
 }

 void ImageModel::updateRows(const QModelIndex &, int start, int end)
 {
     for (int row = start; row <= end; ++row) {
         QJsonValue rowData = EnginioModel::data(index(row)).value<QJsonValue>();
         QString id = rowData.toObject().value("id").toString();
         if (id.isEmpty() || m_images.contains(id))
             continue;
         ImageObject *image = new ImageObject(client());
         connect(image, SIGNAL(imageChanged(QString)), this, SLOT(imageChanged(QString)));
         m_images.insert(id, image);
         image->setObject(rowData.toObject());
         QModelIndex changedIndex = index(row);
         emit dataChanged(changedIndex, changedIndex);
     }
 }

 void ImageModel::imageChanged(const QString &id)
 {
     for (int row = 0; row < rowCount(); ++row) {
         if (data(index(row), Enginio::IdRole).toString() == id) {
             QModelIndex changedIndex = index(row);
             emit dataChanged(changedIndex, changedIndex);
         }
     }
 }

 void ImageModel::onDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
 {
     int start = topLeft.row();
     int end = bottomRight.row();

     updateRows(QModelIndex(), start, end);
 }

 QVariant ImageModel::data(const QModelIndex &index, int role) const
 {
     switch (role) {
     case Qt::DecorationRole: {
         QJsonObject rowData = EnginioModel::data(index).value<QJsonValue>().toObject();
         QString id = rowData.value("id").toString();
         if (m_images.contains(id))
             return m_images.value(id)->thumbnail();
         return QVariant();
     }
     case Qt::SizeHintRole: {
         return QVariant(QSize(100, 100));
     }
     }

     return EnginioModel::data(index, role);
 }

 Qt::ItemFlags ImageModel::flags(const QModelIndex &index) const
 {
     return QAbstractListModel::flags(index) & ~Qt::ItemIsSelectable;
 }