twittertimelinemodel.cpp Example File

twittertimeline/twittertimelinemodel.cpp
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 #include "twittertimelinemodel.h"

 #include <QtGui>
 #include <QtCore>
 #include <QtWidgets>

 TwitterTimelineModel::TwitterTimelineModel(QObject *parent) : QAbstractTableModel(parent)
 {
     connect(&twitter, &Twitter::authenticated, this, &TwitterTimelineModel::authenticated);
     connect(&twitter, &Twitter::authenticated, this, &TwitterTimelineModel::updateTimeline);
 }

 int TwitterTimelineModel::rowCount(const QModelIndex &parent) const
 {
 #if defined(QT_DEBUG)
     Q_ASSERT(!parent.isValid());
 #else
     Q_UNUSED(parent)
 #endif
     return tweets.size();
 }

 QVariant TwitterTimelineModel::data(const QModelIndex &index, int role) const
 {
     if (role != Qt::DisplayRole)
         return QVariant();

     auto it = tweets.begin();
     std::advance(it, index.row());
     switch (index.column())
     {
     case 0:
         return QString::number(it->id);
     case 1:
         return it->createdAt.toString(Qt::SystemLocaleShortDate);
     case 2:
         return it->user;
     case 3:
         return it->text;
     }
     return QVariant();
 }

 int TwitterTimelineModel::columnCount(const QModelIndex &) const
 {
     return 4;
 }

 QVariant TwitterTimelineModel::headerData(int section, Qt::Orientation orientation, int role) const
 {
     if (role != Qt::DisplayRole)
         return QVariant();

     if (orientation == Qt::Horizontal) {
         switch (section) {
         case 0:
             return QStringLiteral("Id");
         case 1:
             return QStringLiteral("Created at");
         case 2:
             return QStringLiteral("User");
         case 3:
             return QStringLiteral("Text");
         }
     }
     return section;
 }

 void TwitterTimelineModel::authenticate(const QPair<QString, QString> &clientCredentials)
 {
     twitter.setClientCredentials(clientCredentials);
     twitter.grant();
 }

 QAbstractOAuth::Status TwitterTimelineModel::status() const
 {
     return twitter.status();
 }

 void TwitterTimelineModel::updateTimeline()
 {
     if (twitter.status() != Twitter::Status::Granted)
         QMessageBox::warning(nullptr, qApp->applicationName(), "Not authenticated");

     QUrl url("https://api.twitter.com/1.1/statuses/home_timeline.json");
     QVariantMap parameters;
     if (tweets.size()) {
         // Tweets are time-ordered, newest first.  Pass the most recent
         // ID we have to request everything more recent than it:
         parameters.insert("since_id", QString::number(tweets.first().id));
         // From https://dev.twitter.com/rest/reference/get/search/tweets:
         // Returns results with an ID greater than (that is, more recent than)
         // the specified ID. There are limits to the number of Tweets which can
         // be accessed through the API. If the limit of Tweets has occurred
         // since the since_id, the since_id will be forced to the oldest ID
         // available.
     }
     QNetworkReply *reply = twitter.get(url, parameters);
     connect(reply, &QNetworkReply::finished, this, &TwitterTimelineModel::parseJson);
 }

 void TwitterTimelineModel::parseJson()
 {
     QJsonParseError parseError;
     auto reply = qobject_cast<QNetworkReply*>(sender());
     Q_ASSERT(reply);
     const auto data = reply->readAll();
     const auto document = QJsonDocument::fromJson(data, &parseError);
     if (parseError.error) {
         qCritical() << "TwitterTimelineModel::parseJson. Error at:" << parseError.offset
                     << parseError.errorString();
         return;
     } else if (document.isObject()) {
         // Error received :(
         const auto object = document.object();
         const auto errorArray = object.value("errors").toArray();
         Q_ASSERT_X(errorArray.size(), "parse", data);
         QStringList errors;
         for (const auto error : errorArray) {
             Q_ASSERT(error.isObject());
             Q_ASSERT(error.toObject().contains("message"));
             errors.append(error.toObject().value("message").toString());
         }
         QMessageBox::warning(nullptr, qApp->applicationName(), errors.join("<br />"));
         return;
     }

     Q_ASSERT_X(document.isArray(), "parse", data);
     const auto array = document.array();
     if (array.size()) {
         beginInsertRows(QModelIndex(), 0, array.size() - 1);
         auto before = tweets.begin();
         for (const auto &value : array) {
             Q_ASSERT(value.isObject());
             const auto object = value.toObject();
             const auto createdAt = QDateTime::fromString(object.value("created_at").toString(),
                                                          "ddd MMM dd HH:mm:ss +0000 yyyy");
             before = tweets.insert(before, Tweet{
                                        object.value("id").toVariant().toULongLong(),
                                        createdAt,
                                        object.value("user").toObject().value("name").toString(),
                                        object.value("text").toString()
                                    });
             std::advance(before, 1);
         }
         endInsertRows();
     }
 }