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;
}

© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.