Show spaces horizontal bar

### Summary

This merge request adds a horizontal bar at top of room list, which shows spaces. By clicking on a space, user can filter out rooms belonging only to that specific space.

### Pending/ Help needed

#### Segfault when loading active connection on startup

Refer `void SortFilterRoomListModel::cacheSpaceHierarchy()` ([link](8c372800d7 (b969e462c30df43ef3714ea441948d8d8027f6a0_117_126))) in `src/sortfilterroomlistmodel.cpp`.

On [line 129](8c372800d7 (b969e462c30df43ef3714ea441948d8d8027f6a0_117_129)), I have called `connection->allRooms()`, which segfaults if the active connection hasn't been loaded yet. Is there a way to ensure that `Controller::instance().activeConnection()` on line 128 waits till connection is loaded?

#### Avatars

Avatars on space horizontal bar aren't aligned to vertical middle. I'll need help with that. 

Using the code below doesn't help with padding

```qml
delegate: QQC2.Control {
    topPadding: 10
    contentItem: Kirigami.Avatar { ..... }
}
```

This complains about uninitialized properties in `Kirigami.Avatar`. (`id`, `currentRoom`, `avatar`, `index` are properties utilized during run time)

After we get around these two issue, this MR will be ready from my side.

src/CMakeLists.txt

@@ -14,6 +14,8 @@ add_library(neochat STATIC
     messageeventmodel.cpp
     messagefiltermodel.cpp
     roomlistmodel.cpp
+    sortfilterspacelistmodel.cpp
+    spacehierarchycache.cpp
     roommanager.cpp
     neochatroom.cpp
     neochatuser.cpp

src/main.cpp

@@ -69,6 +69,8 @@
 #include "roomlistmodel.h"
 #include "roommanager.h"
 #include "sortfilterroomlistmodel.h"
+#include "sortfilterspacelistmodel.h"
+#include "spacehierarchycache.h"
 #include "urlhelper.h"
 #include "userdirectorylistmodel.h"
 #include "userlistmodel.h"
@@ -177,6 +179,7 @@ int main(int argc, char *argv[])
     Login *login = new Login();
     ChatBoxHelper chatBoxHelper;
     UrlHelper urlHelper;
+    SpaceHierarchyCache spaceHierarchyCache;
 
 #ifdef HAVE_COLORSCHEME
     ColorSchemer colorScheme;
@@ -197,6 +200,7 @@ int main(int argc, char *argv[])
     qmlRegisterSingletonInstance("org.kde.neochat", 1, 0, "EmojiModel", new EmojiModel(&app));
     qmlRegisterSingletonInstance("org.kde.neochat", 1, 0, "CommandModel", new CommandModel(&app));
     qmlRegisterSingletonInstance("org.kde.neochat", 1, 0, "AccountRegistry", &Quotient::AccountRegistry::instance());
+    qmlRegisterSingletonInstance("org.kde.neochat", 1, 0, "SpaceHierarchyCache", &spaceHierarchyCache);
     qmlRegisterType<ActionsHandler>("org.kde.neochat", 1, 0, "ActionsHandler");
     qmlRegisterType<ChatDocumentHandler>("org.kde.neochat", 1, 0, "ChatDocumentHandler");
     qmlRegisterType<RoomListModel>("org.kde.neochat", 1, 0, "RoomListModel");
@@ -209,6 +213,7 @@ int main(int argc, char *argv[])
     qmlRegisterType<PublicRoomListModel>("org.kde.neochat", 1, 0, "PublicRoomListModel");
     qmlRegisterType<UserDirectoryListModel>("org.kde.neochat", 1, 0, "UserDirectoryListModel");
     qmlRegisterType<SortFilterRoomListModel>("org.kde.neochat", 1, 0, "SortFilterRoomListModel");
+    qmlRegisterType<SortFilterSpaceListModel>("org.kde.neochat", 1, 0, "SortFilterSpaceListModel");
     qmlRegisterType<DevicesModel>("org.kde.neochat", 1, 0, "DevicesModel");
     qmlRegisterUncreatableType<RoomMessageEvent>("org.kde.neochat", 1, 0, "RoomMessageEvent", "ENUM");
     qmlRegisterUncreatableType<NeoChatRoomType>("org.kde.neochat", 1, 0, "NeoChatRoomType", "ENUM");

src/neochatroom.cpp

@@ -30,6 +30,7 @@
 #include "events/accountdataevents.h"
 #include "events/reactionevent.h"
 #include "events/roomcanonicalaliasevent.h"
+#include "events/roomcreateevent.h"
 #include "events/roommessageevent.h"
 #include "events/roompowerlevelsevent.h"
 #include "events/typingevent.h"
@@ -869,3 +870,17 @@ void NeoChatRoom::clearInvitationNotification()
 {
     NotificationsManager::instance().clearInvitationNotification(id());
 }
+
+bool NeoChatRoom::isSpace()
+{
+    const auto creationEvent = this->creation();
+    if (!creationEvent) {
+        return false;
+    }
+
+#ifdef QUOTIENT_07
+    return creationEvent->roomType() == RoomType::Space;
+#else
+    return false;
+#endif
+}

src/neochatroom.h

@@ -72,6 +72,8 @@ public:
     /// \see lastEventToString
     [[nodiscard]] QString subtitleText();
 
+    [[nodiscard]] bool isSpace();
+
     bool isEventHighlighted(const Quotient::RoomEvent *e) const;
 
     [[nodiscard]] QString joinRule() const;

src/roomlistmodel.cpp

@@ -408,6 +408,10 @@ QVariant RoomListModel::data(const QModelIndex &index, int role) const
     if (role == IdRole) {
         return room->id();
     }
+    if (role == IsSpaceRole) {
+        return room->isSpace();
+    }
+
     return QVariant();
 }
 
@@ -439,6 +443,8 @@ QHash<int, QByteArray> RoomListModel::roleNames() const
     roles[CurrentRoomRole] = "currentRoom";
     roles[CategoryVisibleRole] = "categoryVisible";
     roles[SubtitleTextRole] = "subtitleText";
+    roles[IsSpaceRole] = "isSpace";
+    roles[IdRole] = "id";
     return roles;
 }
 

src/roomlistmodel.h

@@ -52,6 +52,7 @@ public:
         SubtitleTextRole,
         AvatarImageRole,
         IdRole,
+        IsSpaceRole,
     };
     Q_ENUM(EventRoles)
 
@@ -99,6 +100,7 @@ private:
     QMap<int, bool> m_categoryVisibility;
 
     int m_notificationCount = 0;
+    QString m_activeSpaceId = "";
 
     void connectRoomSignals(NeoChatRoom *room);
     void handleNotifications();

src/sortfilterroomlistmodel.cpp

@@ -76,6 +76,23 @@ QString SortFilterRoomListModel::filterText() const
 bool SortFilterRoomListModel::filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
 {
     Q_UNUSED(source_parent);
-    return sourceModel()->data(sourceModel()->index(source_row, 0), RoomListModel::NameRole).toString().contains(m_filterText, Qt::CaseInsensitive)
-        && sourceModel()->data(sourceModel()->index(source_row, 0), RoomListModel::JoinStateRole).toString() != "upgraded";
+
+    bool acceptRoom = sourceModel()->data(sourceModel()->index(source_row, 0), RoomListModel::NameRole).toString().contains(m_filterText, Qt::CaseInsensitive)
+        && sourceModel()->data(sourceModel()->index(source_row, 0), RoomListModel::JoinStateRole).toString() != "upgraded"
+        && sourceModel()->data(sourceModel()->index(source_row, 0), RoomListModel::IsSpaceRole).toBool() == false;
+
+    if (m_activeSpaceRooms.empty())
+        return acceptRoom;
+    else
+        return std::find(m_activeSpaceRooms.begin(),
+                         m_activeSpaceRooms.end(),
+                         sourceModel()->data(sourceModel()->index(source_row, 0), RoomListModel::IdRole).toString())
+            != m_activeSpaceRooms.end()
+            && acceptRoom;
+}
+
+void SortFilterRoomListModel::setActiveSpaceRooms(QVector<QString> activeSpaceRooms)
+{
+    this->m_activeSpaceRooms = activeSpaceRooms;
+    invalidate();
 }

src/sortfilterroomlistmodel.h

@@ -11,6 +11,7 @@ class SortFilterRoomListModel : public QSortFilterProxyModel
 
     Q_PROPERTY(RoomSortOrder roomSortOrder READ roomSortOrder WRITE setRoomSortOrder NOTIFY roomSortOrderChanged)
     Q_PROPERTY(QString filterText READ filterText READ filterText WRITE setFilterText NOTIFY filterTextChanged)
+    Q_PROPERTY(QVector<QString> activeSpaceRooms WRITE setActiveSpaceRooms)
 
 public:
     enum RoomSortOrder {
@@ -30,6 +31,8 @@ public:
 
     [[nodiscard]] bool lessThan(const QModelIndex &source_left, const QModelIndex &source_right) const override;
 
+    Q_INVOKABLE void setActiveSpaceRooms(QVector<QString> activeSpaceRooms);
+
 protected:
     [[nodiscard]] bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const override;
 
@@ -40,4 +43,5 @@ Q_SIGNALS:
 private:
     RoomSortOrder m_sortOrder = Categories;
     QString m_filterText;
+    QVector<QString> m_activeSpaceRooms;
 };

src/sortfilterspacelistmodel.cpp

@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: 2022 Snehit Sah <hi@snehit.dev>
+// SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+
+#include "sortfilterspacelistmodel.h"
+
+#include "roomlistmodel.h"
+
+SortFilterSpaceListModel::SortFilterSpaceListModel(QObject *parent)
+    : QSortFilterProxyModel{parent}
+{
+    setSortRole(RoomListModel::IdRole);
+    sort(0);
+    invalidateFilter();
+}
+
+bool SortFilterSpaceListModel::filterAcceptsRow(int source_row, const QModelIndex &source_parent) const
+{
+    Q_UNUSED(source_parent);
+    return sourceModel()->data(sourceModel()->index(source_row, 0), RoomListModel::IsSpaceRole).toBool()
+        && sourceModel()->data(sourceModel()->index(source_row, 0), RoomListModel::JoinStateRole).toString() != "upgraded";
+}
+
+bool SortFilterSpaceListModel::lessThan(const QModelIndex &source_left, const QModelIndex &source_right) const
+{
+    const auto idLeft = sourceModel()->data(source_left, RoomListModel::IdRole).toString();
+    const auto idRight = sourceModel()->data(source_right, RoomListModel::IdRole).toString();
+    return idLeft < idRight;
+}

src/sortfilterspacelistmodel.h

@@ -0,0 +1,24 @@
+// SPDX-FileCopyrightText: 2022 Snehit Sah <hi@snehit.dev>
+// SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+
+#pragma once
+
+#include <QSortFilterProxyModel>
+
+class SortFilterSpaceListModel : public QSortFilterProxyModel
+{
+    Q_OBJECT
+
+public:
+    explicit SortFilterSpaceListModel(QObject *parent = nullptr);
+
+    [[nodiscard]] QString activeSpaceId() const;
+
+    [[nodiscard]] bool lessThan(const QModelIndex &source_left, const QModelIndex &source_right) const override;
+
+Q_SIGNALS:
+    void activeSpaceIdChanged(QString &activeSpaceId);
+
+protected:
+    [[nodiscard]] bool filterAcceptsRow(int source_row, const QModelIndex &source_parent) const override;
+};

src/spacehierarchycache.cpp

@@ -0,0 +1,72 @@
+// SPDX-FileCopyrightText: 2022 Snehit Sah <hi@snehit.dev>
+// SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+
+#include "spacehierarchycache.h"
+
+#include "controller.h"
+#ifdef QUOTIENT_07
+#include "csapi/space_hierarchy.h"
+#endif
+#include "neochatroom.h"
+
+SpaceHierarchyCache::SpaceHierarchyCache(QObject *parent)
+    : QObject{parent}
+{
+    cacheSpaceHierarchy();
+    connect(&Controller::instance(), &Controller::activeConnectionChanged, this, [this]() {
+        cacheSpaceHierarchy();
+    });
+}
+
+void SpaceHierarchyCache::cacheSpaceHierarchy()
+{
+#ifdef QUOTIENT_07
+    auto connection = Controller::instance().activeConnection();
+    if (!connection) {
+        return;
+    }
+
+    const auto roomList = connection->allRooms();
+    for (const auto &room : roomList) {
+        const auto neoChatRoom = static_cast<NeoChatRoom *>(room);
+        if (neoChatRoom->isSpace()) {
+            populateSpaceHierarchy(neoChatRoom->id());
+        } else {
+            connect(neoChatRoom, &Room::baseStateLoaded, neoChatRoom, [this, neoChatRoom]() {
+                if (neoChatRoom->isSpace()) {
+                    populateSpaceHierarchy(neoChatRoom->id());
+                }
+            });
+        }
+    }
+#endif
+}
+
+void SpaceHierarchyCache::populateSpaceHierarchy(const QString &spaceId)
+{
+    auto connection = Controller::instance().activeConnection();
+    if (!connection) {
+        return;
+    }
+#ifdef QUOTIENT_07
+    GetSpaceHierarchyJob *job = connection->callApi<GetSpaceHierarchyJob>(spaceId);
+
+    connect(job, &BaseJob::success, this, [this, job, spaceId]() {
+        const auto rooms = job->rooms();
+        QVector<QString> roomList;
+        for (unsigned long i = 0; i < rooms.size(); ++i) {
+            roomList.push_back(rooms.at(i).roomId);
+        }
+        m_spaceHierarchy.insert(spaceId, roomList);
+        Q_EMIT spaceHierarchyChanged();
+    });
+#endif
+}
+
+QVector<QString> SpaceHierarchyCache::getRoomListForSpace(const QString &spaceId, bool updateCache)
+{
+    if (updateCache) {
+        populateSpaceHierarchy(spaceId);
+    }
+    return m_spaceHierarchy[spaceId];
+}

src/spacehierarchycache.h

@@ -0,0 +1,28 @@
+// SPDX-FileCopyrightText: 2022 Snehit Sah <hi@snehit.dev>
+// SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+
+#pragma once
+
+#include <QHash>
+#include <QObject>
+#include <QString>
+#include <QVector>
+
+class SpaceHierarchyCache : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit SpaceHierarchyCache(QObject *parent = nullptr);
+
+    [[nodiscard]] Q_INVOKABLE QVector<QString> getRoomListForSpace(const QString &spaceId, bool updateCache);
+
+Q_SIGNALS:
+    void spaceHierarchyChanged();
+
+private:
+    QVector<QString> m_activeSpaceRooms;
+    QHash<QString, QVector<QString>> m_spaceHierarchy;
+    void cacheSpaceHierarchy();
+    void populateSpaceHierarchy(const QString &spaceId);
+};