diff --git a/src/CommunitiesList.cc b/src/CommunitiesList.cc
new file mode 100644
index 00000000..c40155e5
--- /dev/null
+++ b/src/CommunitiesList.cc
@@ -0,0 +1,150 @@
+#include "CommunitiesList.h"
+
+#include <QLabel>
+
+CommunitiesList::CommunitiesList(QSharedPointer<MatrixClient> client, QWidget *parent)
+ : QWidget(parent)
+ , client_(client)
+{
+ QSizePolicy sizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
+ sizePolicy.setHorizontalStretch(0);
+ sizePolicy.setVerticalStretch(1);
+ setSizePolicy(sizePolicy);
+
+ setStyleSheet("border-style: none;");
+
+ topLayout_ = new QVBoxLayout(this);
+ topLayout_->setSpacing(0);
+ topLayout_->setMargin(0);
+
+ setFixedWidth(ui::sidebar::CommunitiesSidebarSize);
+
+ scrollArea_ = new QScrollArea(this);
+ scrollArea_->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+ scrollArea_->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+ scrollArea_->setSizeAdjustPolicy(QAbstractScrollArea::AdjustToContents);
+ scrollArea_->setWidgetResizable(true);
+ scrollArea_->setAlignment(Qt::AlignLeading | Qt::AlignTop | Qt::AlignVCenter);
+
+ scrollAreaContents_ = new QWidget();
+
+ contentsLayout_ = new QVBoxLayout(scrollAreaContents_);
+ contentsLayout_->setSpacing(0);
+ contentsLayout_->setMargin(0);
+
+ WorldCommunityListItem *world_list_item = new WorldCommunityListItem();
+ contentsLayout_->addWidget(world_list_item);
+ communities_.insert("world", QSharedPointer<CommunitiesListItem>(world_list_item));
+ connect(world_list_item,
+ &WorldCommunityListItem::clicked,
+ this,
+ &CommunitiesList::highlightSelectedCommunity);
+ contentsLayout_->addStretch(1);
+
+ scrollArea_->setWidget(scrollAreaContents_);
+ topLayout_->addWidget(scrollArea_);
+
+ connect(client_.data(),
+ &MatrixClient::communityProfileRetrieved,
+ this,
+ [=](QString communityId, QJsonObject profile) {
+ client_->fetchCommunityAvatar(communityId,
+ QUrl(profile["avatar_url"].toString()));
+ });
+ connect(client_.data(),
+ SIGNAL(communityAvatarRetrieved(const QString &, const QPixmap &)),
+ this,
+ SLOT(updateCommunityAvatar(const QString &, const QPixmap &)));
+}
+
+CommunitiesList::~CommunitiesList() {}
+
+void
+CommunitiesList::setCommunities(const QMap<QString, QSharedPointer<Community>> &communities)
+{
+ communities_.clear();
+
+ // TODO: still not sure how to handle the "world" special-case
+ WorldCommunityListItem *world_list_item = new WorldCommunityListItem();
+ communities_.insert("world", QSharedPointer<CommunitiesListItem>(world_list_item));
+ connect(world_list_item,
+ &WorldCommunityListItem::clicked,
+ this,
+ &CommunitiesList::highlightSelectedCommunity);
+ contentsLayout_->insertWidget(0, world_list_item);
+
+ for (auto it = communities.constBegin(); it != communities.constEnd(); it++) {
+ const auto community_id = it.key();
+ const auto community = it.value();
+
+ addCommunity(community, community_id);
+
+ client_->fetchCommunityProfile(community_id);
+ client_->fetchCommunityRooms(community_id);
+ }
+
+ world_list_item->setPressedState(true);
+ emit communityChanged("world");
+}
+
+void
+CommunitiesList::clear()
+{
+ communities_.clear();
+}
+
+void
+CommunitiesList::addCommunity(QSharedPointer<Community> community, const QString &community_id)
+{
+ CommunitiesListItem *list_item =
+ new CommunitiesListItem(community, community_id, scrollArea_);
+
+ communities_.insert(community_id, QSharedPointer<CommunitiesListItem>(list_item));
+
+ client_->fetchCommunityAvatar(community_id, community->getAvatar());
+
+ contentsLayout_->insertWidget(contentsLayout_->count() - 1, list_item);
+
+ connect(list_item,
+ &CommunitiesListItem::clicked,
+ this,
+ &CommunitiesList::highlightSelectedCommunity);
+}
+
+void
+CommunitiesList::removeCommunity(const QString &community_id)
+{
+ communities_.remove(community_id);
+}
+
+void
+CommunitiesList::updateCommunityAvatar(const QString &community_id, const QPixmap &img)
+{
+ if (!communities_.contains(community_id)) {
+ qWarning() << "Avatar update on nonexistent community" << community_id;
+ return;
+ }
+
+ communities_.value(community_id)->setAvatar(img.toImage());
+}
+
+void
+CommunitiesList::highlightSelectedCommunity(const QString &community_id)
+{
+ emit communityChanged(community_id);
+
+ if (!communities_.contains(community_id)) {
+ qDebug() << "CommunitiesList: clicked unknown community";
+ return;
+ }
+
+ for (auto it = communities_.constBegin(); it != communities_.constEnd(); it++) {
+ if (it.key() != community_id) {
+ it.value()->setPressedState(false);
+ } else {
+ it.value()->setPressedState(true);
+ scrollArea_->ensureWidgetVisible(
+ qobject_cast<QWidget *>(it.value().data()));
+ }
+ }
+}
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