Qt Documentation (Technology Preview) | Qt Network Authorization | Reddit Example | redditmodel.cpp Example File

Qt 5.9.3 Reference Documentation

# 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, [=]() {
              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();
          });
      }