imagemodel.cpp Example File

image-gallery-cpp/imagemodel.cpp

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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;
  }