- Enginio Manual
- Enginio C++ Classes and Examples
- Enginio C++ Examples - Image Gallery
- imagemodel.cpp Example File
- Enginio 1.2.1 Reference Documentation

# imagemodel.cpp Example File

image-gallery-cpp/imagemodel.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** 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:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
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    **   * Redistributions of source code must retain the above copyright
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    **     the documentation and/or other materials provided with the
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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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;
    }