twittertimelinemodel.cpp Example File

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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(""); 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 // 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(); } }

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