redditmodel.cpp Example File

redditclient/redditmodel.cpp
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 #include "redditmodel.h"

 #include <QtCore>
 #include <QtNetwork>

 RedditModel::RedditModel(QObject *parent) : QAbstractTableModel(parent) {}

 RedditModel::RedditModel(const QString &clientId, QObject *parent) :
     QAbstractTableModel(parent),
     redditWrapper(clientId)
 {
     grant();
 }

 int RedditModel::rowCount(const QModelIndex &parent) const
 {
     Q_UNUSED(parent);
     return threads.size();
 }

 int RedditModel::columnCount(const QModelIndex &parent) const
 {
     Q_UNUSED(parent);
     return threads.size() ? 1 : 0;
 }

 QVariant RedditModel::data(const QModelIndex &index, int role) const
 {
     Q_UNUSED(role);
     if (!index.isValid())
         return QVariant();

     if (role == Qt::DisplayRole) {
         const auto childrenObject = threads.at(index.row());
         Q_ASSERT(childrenObject.value("data").isObject());
         const auto dataObject = childrenObject.value("data").toObject();
         return dataObject.value("title").toString();
     }
     return QVariant();
 }

 void RedditModel::grant()
 {
     redditWrapper.grant();
     connect(&redditWrapper, &RedditWrapper::authenticated, this, &RedditModel::update);
 }

 void RedditModel::update()
 {
     auto reply = redditWrapper.requestHotThreads();

     connect(reply, &QNetworkReply::finished, [=]() {
         reply->deleteLater();
         if (reply->error() != QNetworkReply::NoError) {
             emit error(reply->errorString());
             return;
         }
         const auto json = reply->readAll();
         const auto document = QJsonDocument::fromJson(json);
         Q_ASSERT(document.isObject());
         const auto rootObject = document.object();
         Q_ASSERT(rootObject.value("kind").toString() == "Listing");
         const auto dataValue = rootObject.value("data");
         Q_ASSERT(dataValue.isObject());
         const auto dataObject = dataValue.toObject();
         const auto childrenValue = dataObject.value("children");
         Q_ASSERT(childrenValue.isArray());
         const auto childrenArray = childrenValue.toArray();

         if (childrenArray.isEmpty())
             return;

         beginInsertRows(QModelIndex(), threads.size(), childrenArray.size() + threads.size() - 1);
         for (const auto childValue : qAsConst(childrenArray)) {
             Q_ASSERT(childValue.isObject());
             threads.append(childValue.toObject());
         }
         endInsertRows();
     });
 }