File indexing completed on 2024-05-05 05:38:30

 /*
     SPDX-FileCopyrightText: 2019 Kai Uwe Broulik <kde@privat.broulik.de>
 
     SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
 #include "notifications.h"
 
 #include <QConcatenateTablesProxyModel>
 #include <QDebug>
 #include <QMetaEnum>
 #include <memory>
 
 #include <KDescendantsProxyModel>
 
 #include "limitedrowcountproxymodel_p.h"
 #include "notificationfilterproxymodel_p.h"
 #include "notificationgroupcollapsingproxymodel_p.h"
 #include "notificationgroupingproxymodel_p.h"
 #include "notificationsmodel.h"
 #include "notificationsortproxymodel_p.h"
 
 #include "jobsmodel.h"
 
 #include "settings.h"
 
 #include "notification.h"
 
 #include "utils_p.h"
 
 #include "debug.h"
 
 using namespace NotificationManager;
 
 class Q_DECL_HIDDEN Notifications::Private
 {
 public:
     explicit Private(Notifications *q);
     ~Private();
 
     void initSourceModels();
     void initProxyModels();
 
     void updateCount();
 
     bool showNotifications = true;
     bool showJobs = false;
 
     Notifications::GroupMode groupMode = Notifications::GroupDisabled;
     int groupLimit = 0;
     bool expandUnread = false;
 
     int activeNotificationsCount = 0;
     int expiredNotificationsCount = 0;
 
     int unreadNotificationsCount = 0;
 
     int activeJobsCount = 0;
     int jobsPercentage = 0;
 
     static bool isGroup(const QModelIndex &idx);
     static uint notificationId(const QModelIndex &idx);
     QModelIndex mapFromModel(const QModelIndex &idx) const;
 
     // NOTE when you add or re-arrange models make sure to update mapFromModel()!
     NotificationsModel::Ptr notificationsModel;
     JobsModel::Ptr jobsModel;
     std::shared_ptr<Settings> settings() const;
 
     QConcatenateTablesProxyModel *notificationsAndJobsModel = nullptr;
 
     NotificationFilterProxyModel *filterModel = nullptr;
     NotificationSortProxyModel *sortModel = nullptr;
     NotificationGroupingProxyModel *groupingModel = nullptr;
     NotificationGroupCollapsingProxyModel *groupCollapsingModel = nullptr;
     KDescendantsProxyModel *flattenModel = nullptr;
 
     LimitedRowCountProxyModel *limiterModel = nullptr;
 
 private:
     Notifications *q;
 };
 
 Notifications::Private::Private(Notifications *q)
     : q(q)
 {
 }
 
 Notifications::Private::~Private()
 {
 }
 
 void Notifications::Private::initSourceModels()
 {
     Q_ASSERT(notificationsAndJobsModel); // initProxyModels must be called before initSourceModels
 
     if (showNotifications && !notificationsModel) {
         notificationsModel = NotificationsModel::createNotificationsModel();
         notificationsAndJobsModel->addSourceModel(notificationsModel.get());
         connect(notificationsModel.get(), &NotificationsModel::lastReadChanged, q, [this] {
             updateCount();
             Q_EMIT q->lastReadChanged();
         });
     } else if (!showNotifications && notificationsModel) {
         notificationsAndJobsModel->removeSourceModel(notificationsModel.get());
         disconnect(notificationsModel.get(), nullptr, q, nullptr); // disconnect all
         notificationsModel = nullptr;
     }
 
     if (showJobs && !jobsModel) {
         jobsModel = JobsModel::createJobsModel();
         notificationsAndJobsModel->addSourceModel(jobsModel.get());
         jobsModel->init();
     } else if (!showJobs && jobsModel) {
         notificationsAndJobsModel->removeSourceModel(jobsModel.get());
         jobsModel = nullptr;
     }
 }
 
 void Notifications::Private::initProxyModels()
 {
     /* The data flow is as follows:
      * NOTE when you add or re-arrange models make sure to update mapFromModel()!
      *
      * NotificationsModel      JobsModel
      *        \\                 /
      *         \\               /
      *     QConcatenateTablesProxyModel
      *               |||
      *               |||
      *     NotificationFilterProxyModel
      *     (filters by urgency, whitelist, etc)
      *                |
      *                |
      *      NotificationSortProxyModel
      *      (sorts by urgency, date, etc)
      *                |
      * --- BEGIN: Only when grouping is enabled ---
      *                |
      *    NotificationGroupingProxyModel
      *    (turns list into tree grouped by app)
      *               //\\
      *               //\\
      *   NotificationGroupCollapsingProxyModel
      *   (limits number of tree leaves for expand/collapse feature)
      *                /\
      *                /\
      *       KDescendantsProxyModel
      *       (flattens tree back into a list for consumption in ListView)
      *                |
      * --- END: Only when grouping is enabled ---
      *                |
      *    LimitedRowCountProxyModel
      *    (limits the total number of items in the model)
      *                |
      *                |
      *               \o/ <- Happy user seeing their notifications
      */
 
     if (!notificationsAndJobsModel) {
         notificationsAndJobsModel = new QConcatenateTablesProxyModel(q);
     }
 
     if (!filterModel) {
         filterModel = new NotificationFilterProxyModel();
         connect(filterModel, &NotificationFilterProxyModel::urgenciesChanged, q, &Notifications::urgenciesChanged);
         connect(filterModel, &NotificationFilterProxyModel::showExpiredChanged, q, &Notifications::showExpiredChanged);
         connect(filterModel, &NotificationFilterProxyModel::showDismissedChanged, q, &Notifications::showDismissedChanged);
         connect(filterModel, &NotificationFilterProxyModel::blacklistedDesktopEntriesChanged, q, &Notifications::blacklistedDesktopEntriesChanged);
         connect(filterModel, &NotificationFilterProxyModel::blacklistedNotifyRcNamesChanged, q, &Notifications::blacklistedNotifyRcNamesChanged);
 
         filterModel->setSourceModel(notificationsAndJobsModel);
 
         connect(filterModel, &QAbstractItemModel::rowsInserted, q, [this] {
             updateCount();
         });
         connect(filterModel, &QAbstractItemModel::rowsRemoved, q, [this] {
             updateCount();
         });
         connect(filterModel, &QAbstractItemModel::dataChanged, q, [this](const QModelIndex &topLeft, const QModelIndex &bottomRight, const QList<int> &roles) {
             Q_UNUSED(topLeft);
             Q_UNUSED(bottomRight);
             if (roles.isEmpty() || roles.contains(Notifications::UpdatedRole) || roles.contains(Notifications::ExpiredRole)
                 || roles.contains(Notifications::JobStateRole) || roles.contains(Notifications::PercentageRole) || roles.contains(Notifications::ReadRole)) {
                 updateCount();
             }
         });
     }
 
     if (!sortModel) {
         sortModel = new NotificationSortProxyModel(q);
         connect(sortModel, &NotificationSortProxyModel::sortModeChanged, q, &Notifications::sortModeChanged);
         connect(sortModel, &NotificationSortProxyModel::sortOrderChanged, q, &Notifications::sortOrderChanged);
     }
 
     if (!limiterModel) {
         limiterModel = new LimitedRowCountProxyModel(q);
         connect(limiterModel, &LimitedRowCountProxyModel::limitChanged, q, &Notifications::limitChanged);
     }
 
     if (groupMode == GroupApplicationsFlat) {
         if (!groupingModel) {
             groupingModel = new NotificationGroupingProxyModel(q);
             groupingModel->setSourceModel(filterModel);
         }
 
         if (!groupCollapsingModel) {
             groupCollapsingModel = new NotificationGroupCollapsingProxyModel(q);
             groupCollapsingModel->setLimit(groupLimit);
             groupCollapsingModel->setExpandUnread(expandUnread);
             groupCollapsingModel->setLastRead(q->lastRead());
             groupCollapsingModel->setSourceModel(groupingModel);
         }
 
         sortModel->setSourceModel(groupCollapsingModel);
 
         flattenModel = new KDescendantsProxyModel(q);
         flattenModel->setSourceModel(sortModel);
 
         limiterModel->setSourceModel(flattenModel);
     } else {
         sortModel->setSourceModel(filterModel);
         limiterModel->setSourceModel(sortModel);
         delete flattenModel;
         flattenModel = nullptr;
         delete groupingModel;
         groupingModel = nullptr;
     }
 
     q->setSourceModel(limiterModel);
 }
 
 void Notifications::Private::updateCount()
 {
     int active = 0;
     int expired = 0;
     int unread = 0;
 
     int jobs = 0;
     int totalPercentage = 0;
 
     // We want to get the numbers after main filtering (urgencies, whitelists, etc)
     // but before any limiting or group limiting, hence asking the filterModel for advice
     // at which point notifications and jobs also have already been merged
     for (int i = 0; i < filterModel->rowCount(); ++i) {
         const QModelIndex idx = filterModel->index(i, 0);
 
         if (idx.data(Notifications::ExpiredRole).toBool()) {
             ++expired;
         } else {
             ++active;
         }
 
         const bool read = idx.data(Notifications::ReadRole).toBool();
         if (!active && !read) {
             QDateTime date = idx.data(Notifications::UpdatedRole).toDateTime();
             if (!date.isValid()) {
                 date = idx.data(Notifications::CreatedRole).toDateTime();
             }
 
             if (notificationsModel && date > notificationsModel->lastRead()) {
                 ++unread;
             }
         }
 
         if (idx.data(Notifications::TypeRole).toInt() == Notifications::JobType) {
             if (idx.data(Notifications::JobStateRole).toInt() != Notifications::JobStateStopped) {
                 ++jobs;
 
                 totalPercentage += idx.data(Notifications::PercentageRole).toInt();
             }
         }
     }
 
     if (activeNotificationsCount != active) {
         activeNotificationsCount = active;
         Q_EMIT q->activeNotificationsCountChanged();
     }
     if (expiredNotificationsCount != expired) {
         expiredNotificationsCount = expired;
         Q_EMIT q->expiredNotificationsCountChanged();
     }
     if (unreadNotificationsCount != unread) {
         unreadNotificationsCount = unread;
         Q_EMIT q->unreadNotificationsCountChanged();
     }
     if (activeJobsCount != jobs) {
         activeJobsCount = jobs;
         Q_EMIT q->activeJobsCountChanged();
     }
 
     const int percentage = (jobs > 0 ? totalPercentage / jobs : 0);
     if (jobsPercentage != percentage) {
         jobsPercentage = percentage;
         Q_EMIT q->jobsPercentageChanged();
     }
 
     // TODO don't Q_EMIT in dataChanged
     Q_EMIT q->countChanged();
 }
 
 bool Notifications::Private::isGroup(const QModelIndex &idx)
 {
     return idx.data(Notifications::IsGroupRole).toBool();
 }
 
 uint Notifications::Private::notificationId(const QModelIndex &idx)
 {
     return idx.data(Notifications::IdRole).toUInt();
 }
 
 QModelIndex Notifications::Private::mapFromModel(const QModelIndex &idx) const
 {
     QModelIndex resolvedIdx = idx;
 
     QAbstractItemModel *models[] = {
         notificationsAndJobsModel,
         filterModel,
         sortModel,
         groupingModel,
         groupCollapsingModel,
         flattenModel,
         limiterModel,
     };
 
     // TODO can we do this with a generic loop like mapFromModel
     while (resolvedIdx.isValid() && resolvedIdx.model() != q) {
         const auto *idxModel = resolvedIdx.model();
 
         // HACK try to find the model that uses the index' model as source
         bool found = false;
         for (QAbstractItemModel *model : models) {
             if (!model) {
                 continue;
             }
 
             if (auto *proxyModel = qobject_cast<QAbstractProxyModel *>(model)) {
                 if (proxyModel->sourceModel() == idxModel) {
                     resolvedIdx = proxyModel->mapFromSource(resolvedIdx);
                     found = true;
                     break;
                 }
             } else if (auto *concatenateModel = qobject_cast<QConcatenateTablesProxyModel *>(model)) {
                 if (idxModel == notificationsModel.get() || idxModel == jobsModel.get()) {
                     resolvedIdx = concatenateModel->mapFromSource(resolvedIdx);
                     found = true;
                     break;
                 }
             }
         }
 
         if (!found) {
             break;
         }
     }
     return resolvedIdx;
 }
 
 std::shared_ptr<Settings> Notifications::Private::settings() const
 {
     static std::weak_ptr<Settings> s_instance;
     if (!s_instance.expired()) {
         std::shared_ptr<Settings> ptr(new Settings());
         s_instance = ptr;
         return ptr;
     }
     return s_instance.lock();
 }
 
 Notifications::Notifications(QObject *parent)
     : QSortFilterProxyModel(parent)
     , d(new Private(this))
 {
     // The proxy models are always the same, just with different
     // properties set whereas we want to avoid loading a source model
     // e.g. notifications or jobs when we're not actually using them
     d->initProxyModels();
 
     // init source models when used from C++
     QMetaObject::invokeMethod(
         this,
         [this] {
             d->initSourceModels();
         },
         Qt::QueuedConnection);
 }
 
 Notifications::~Notifications() = default;
 
 void Notifications::classBegin()
 {
 }
 
 void Notifications::componentComplete()
 {
     // init source models when used from QML
     d->initSourceModels();
 }
 
 int Notifications::limit() const
 {
     return d->limiterModel->limit();
 }
 
 void Notifications::setLimit(int limit)
 {
     d->limiterModel->setLimit(limit);
 }
 
 int Notifications::groupLimit() const
 {
     return d->groupLimit;
 }
 
 void Notifications::setGroupLimit(int limit)
 {
     if (d->groupLimit == limit) {
         return;
     }
 
     d->groupLimit = limit;
     if (d->groupCollapsingModel) {
         d->groupCollapsingModel->setLimit(limit);
     }
     Q_EMIT groupLimitChanged();
 }
 
 bool Notifications::expandUnread() const
 {
     return d->expandUnread;
 }
 
 void Notifications::setExpandUnread(bool expand)
 {
     if (d->expandUnread == expand) {
         return;
     }
 
     d->expandUnread = expand;
     if (d->groupCollapsingModel) {
         d->groupCollapsingModel->setExpandUnread(expand);
     }
     Q_EMIT expandUnreadChanged();
 }
 
 QWindow *Notifications::window() const
 {
     return d->notificationsModel ? d->notificationsModel->window() : nullptr;
 }
 
 void Notifications::setWindow(QWindow *window)
 {
     if (d->notificationsModel) {
         d->notificationsModel->setWindow(window);
     } else {
         qCWarning(NOTIFICATIONMANAGER) << "Setting window before initialising the model" << this << window;
     }
 }
 
 bool Notifications::showExpired() const
 {
     return d->filterModel->showExpired();
 }
 
 void Notifications::setShowExpired(bool show)
 {
     d->filterModel->setShowExpired(show);
 }
 
 bool Notifications::showDismissed() const
 {
     return d->filterModel->showDismissed();
 }
 
 void Notifications::setShowDismissed(bool show)
 {
     d->filterModel->setShowDismissed(show);
 }
 
 QStringList Notifications::blacklistedDesktopEntries() const
 {
     return d->filterModel->blacklistedDesktopEntries();
 }
 
 void Notifications::setBlacklistedDesktopEntries(const QStringList &blacklist)
 {
     d->filterModel->setBlackListedDesktopEntries(blacklist);
 }
 
 QStringList Notifications::blacklistedNotifyRcNames() const
 {
     return d->filterModel->blacklistedNotifyRcNames();
 }
 
 void Notifications::setBlacklistedNotifyRcNames(const QStringList &blacklist)
 {
     d->filterModel->setBlacklistedNotifyRcNames(blacklist);
 }
 
 QStringList Notifications::whitelistedDesktopEntries() const
 {
     return d->filterModel->whitelistedDesktopEntries();
 }
 
 void Notifications::setWhitelistedDesktopEntries(const QStringList &whitelist)
 {
     d->filterModel->setWhiteListedDesktopEntries(whitelist);
 }
 
 QStringList Notifications::whitelistedNotifyRcNames() const
 {
     return d->filterModel->whitelistedNotifyRcNames();
 }
 
 void Notifications::setWhitelistedNotifyRcNames(const QStringList &whitelist)
 {
     d->filterModel->setWhitelistedNotifyRcNames(whitelist);
 }
 
 bool Notifications::showNotifications() const
 {
     return d->showNotifications;
 }
 
 void Notifications::setShowNotifications(bool show)
 {
     if (d->showNotifications == show) {
         return;
     }
 
     d->showNotifications = show;
     d->initSourceModels();
     Q_EMIT showNotificationsChanged();
 }
 
 bool Notifications::showJobs() const
 {
     return d->showJobs;
 }
 
 void Notifications::setShowJobs(bool show)
 {
     if (d->showJobs == show) {
         return;
     }
 
     d->showJobs = show;
     d->initSourceModels();
     Q_EMIT showJobsChanged();
 }
 
 Notifications::Urgencies Notifications::urgencies() const
 {
     return d->filterModel->urgencies();
 }
 
 void Notifications::setUrgencies(Urgencies urgencies)
 {
     d->filterModel->setUrgencies(urgencies);
 }
 
 Notifications::SortMode Notifications::sortMode() const
 {
     return d->sortModel->sortMode();
 }
 
 void Notifications::setSortMode(SortMode sortMode)
 {
     d->sortModel->setSortMode(sortMode);
 }
 
 Qt::SortOrder Notifications::sortOrder() const
 {
     return d->sortModel->sortOrder();
 }
 
 void Notifications::setSortOrder(Qt::SortOrder sortOrder)
 {
     d->sortModel->setSortOrder(sortOrder);
 }
 
 Notifications::GroupMode Notifications::groupMode() const
 {
     return d->groupMode;
 }
 
 void Notifications::setGroupMode(GroupMode groupMode)
 {
     if (d->groupMode != groupMode) {
         d->groupMode = groupMode;
         d->initProxyModels();
         Q_EMIT groupModeChanged();
     }
 }
 
 int Notifications::count() const
 {
     return rowCount(QModelIndex());
 }
 
 int Notifications::activeNotificationsCount() const
 {
     return d->activeNotificationsCount;
 }
 
 int Notifications::expiredNotificationsCount() const
 {
     return d->expiredNotificationsCount;
 }
 
 QDateTime Notifications::lastRead() const
 {
     if (d->notificationsModel) {
         return d->notificationsModel->lastRead();
     }
     return QDateTime();
 }
 
 void Notifications::setLastRead(const QDateTime &lastRead)
 {
     // TODO jobs could also be unread?
     if (d->notificationsModel) {
         d->notificationsModel->setLastRead(lastRead);
     }
     if (d->groupCollapsingModel) {
         d->groupCollapsingModel->setLastRead(lastRead);
     }
 }
 
 void Notifications::resetLastRead()
 {
     setLastRead(QDateTime::currentDateTimeUtc());
 }
 
 int Notifications::unreadNotificationsCount() const
 {
     return d->unreadNotificationsCount;
 }
 
 int Notifications::activeJobsCount() const
 {
     return d->activeJobsCount;
 }
 
 int Notifications::jobsPercentage() const
 {
     return d->jobsPercentage;
 }
 
 QPersistentModelIndex Notifications::makePersistentModelIndex(const QModelIndex &idx) const
 {
     return QPersistentModelIndex(idx);
 }
 
 void Notifications::expire(const QModelIndex &idx)
 {
     switch (static_cast<Notifications::Type>(idx.data(Notifications::TypeRole).toInt())) {
     case Notifications::NotificationType:
         d->notificationsModel->expire(Private::notificationId(idx));
         break;
     case Notifications::JobType:
         d->jobsModel->expire(Utils::mapToModel(idx, d->jobsModel.get()));
         break;
     default:
         Q_UNREACHABLE();
     }
 }
 
 void Notifications::close(const QModelIndex &idx)
 {
     if (idx.data(Notifications::IsGroupRole).toBool()) {
         const QModelIndex groupIdx = Utils::mapToModel(idx, d->groupingModel);
         if (!groupIdx.isValid()) {
             qCWarning(NOTIFICATIONMANAGER) << "Failed to find group model index for this item";
             return;
         }
 
         Q_ASSERT(groupIdx.model() == d->groupingModel);
 
         const int childCount = d->groupingModel->rowCount(groupIdx);
         for (int i = childCount - 1; i >= 0; --i) {
             const QModelIndex childIdx = d->groupingModel->index(i, 0, groupIdx);
             close(childIdx);
         }
         return;
     }
 
     if (!idx.data(Notifications::ClosableRole).toBool()) {
         return;
     }
 
     switch (static_cast<Notifications::Type>(idx.data(Notifications::TypeRole).toInt())) {
     case Notifications::NotificationType:
         d->notificationsModel->close(Private::notificationId(idx));
         break;
     case Notifications::JobType:
         d->jobsModel->close(Utils::mapToModel(idx, d->jobsModel.get()));
         break;
     default:
         Q_UNREACHABLE();
     }
 }
 
 void Notifications::configure(const QModelIndex &idx)
 {
     if (!d->notificationsModel) {
         return;
     }
 
     // For groups just configure the application, not the individual event
     if (Private::isGroup(idx)) {
         const QString desktopEntry = idx.data(Notifications::DesktopEntryRole).toString();
         const QString notifyRcName = idx.data(Notifications::NotifyRcNameRole).toString();
 
         d->notificationsModel->configure(desktopEntry, notifyRcName, QString() /*eventId*/);
         return;
     }
 
     d->notificationsModel->configure(Private::notificationId(idx));
 }
 
 void Notifications::invokeDefaultAction(const QModelIndex &idx, InvokeBehavior behavior)
 {
     if (d->notificationsModel) {
         d->notificationsModel->invokeDefaultAction(Private::notificationId(idx), behavior);
     }
 }
 
 void Notifications::invokeAction(const QModelIndex &idx, const QString &actionId, InvokeBehavior behavior)
 {
     if (d->notificationsModel) {
         d->notificationsModel->invokeAction(Private::notificationId(idx), actionId, behavior);
     }
 }
 
 void Notifications::reply(const QModelIndex &idx, const QString &text, InvokeBehavior behavior)
 {
     if (d->notificationsModel) {
         d->notificationsModel->reply(Private::notificationId(idx), text, behavior);
     }
 }
 
 void Notifications::startTimeout(const QModelIndex &idx)
 {
     startTimeout(Private::notificationId(idx));
 }
 
 void Notifications::startTimeout(uint notificationId)
 {
     if (d->notificationsModel) {
         d->notificationsModel->startTimeout(notificationId);
     }
 }
 
 void Notifications::stopTimeout(const QModelIndex &idx)
 {
     if (d->notificationsModel) {
         d->notificationsModel->stopTimeout(Private::notificationId(idx));
     }
 }
 
 void Notifications::suspendJob(const QModelIndex &idx)
 {
     if (d->jobsModel) {
         d->jobsModel->suspend(Utils::mapToModel(idx, d->jobsModel.get()));
     }
 }
 
 void Notifications::resumeJob(const QModelIndex &idx)
 {
     if (d->jobsModel) {
         d->jobsModel->resume(Utils::mapToModel(idx, d->jobsModel.get()));
     }
 }
 
 void Notifications::killJob(const QModelIndex &idx)
 {
     if (d->jobsModel) {
         d->jobsModel->kill(Utils::mapToModel(idx, d->jobsModel.get()));
     }
 }
 
 void Notifications::clear(ClearFlags flags)
 {
     if (d->notificationsModel) {
         d->notificationsModel->clear(flags);
     }
     if (d->jobsModel) {
         d->jobsModel->clear(flags);
     }
 }
 
 QModelIndex Notifications::groupIndex(const QModelIndex &idx) const
 {
     if (idx.data(Notifications::IsGroupRole).toBool()) {
         return idx;
     }
 
     if (idx.data(Notifications::IsInGroupRole).toBool()) {
         QModelIndex groupingIdx = Utils::mapToModel(idx, d->groupingModel);
         return d->mapFromModel(groupingIdx.parent());
     }
 
     qCWarning(NOTIFICATIONMANAGER) << "Cannot get group index for item that isn't a group or inside one";
     return QModelIndex();
 }
 
 void Notifications::collapseAllGroups()
 {
     if (d->groupCollapsingModel) {
         d->groupCollapsingModel->collapseAll();
     }
 }
 
 QVariant Notifications::data(const QModelIndex &index, int role) const
 {
     return QSortFilterProxyModel::data(index, role);
 }
 
 bool Notifications::setData(const QModelIndex &index, const QVariant &value, int role)
 {
     return QSortFilterProxyModel::setData(index, value, role);
 }
 
 bool Notifications::filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
 {
     return QSortFilterProxyModel::filterAcceptsRow(source_row, source_parent);
 }
 
 bool Notifications::lessThan(const QModelIndex &source_left, const QModelIndex &source_right) const
 {
     return QSortFilterProxyModel::lessThan(source_left, source_right);
 }
 
 int Notifications::rowCount(const QModelIndex &parent) const
 {
     return QSortFilterProxyModel::rowCount(parent);
 }
 
 QHash<int, QByteArray> Notifications::roleNames() const
 {
     return Utils::roleNames();
 }