redditmodel.cpp Example File

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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();
      });
  }