imagemodel.cpp Example File | Enginio Manual 1.6

Qt 1.6 | Enginio Manual | Enginio C++ Examples - Image Gallery | imagemodel.cpp Example File

Qt 1.6.2 Reference Documentation

# imagemodel.cpp Example File

image-gallery-cpp/imagemodel.cpp

      /****************************************************************************
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      ** Contact: http://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** You may use this file under the terms of the BSD license as follows:
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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;
      }