diff --git a/src/CommunitiesList.cpp b/src/CommunitiesList.cpp
new file mode 100644
index 00000000..c271be89
--- /dev/null
+++ b/src/CommunitiesList.cpp
@@ -0,0 +1,195 @@
+#include "CommunitiesList.h"
+#include "Cache.h"
+#include "Logging.h"
+#include "MatrixClient.h"
+
+#include <QLabel>
+
+CommunitiesList::CommunitiesList(QWidget *parent)
+ : QWidget(parent)
+{
+ 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);
+
+ addGlobalItem();
+ contentsLayout_->addStretch(1);
+
+ scrollArea_->setWidget(scrollAreaContents_);
+ topLayout_->addWidget(scrollArea_);
+
+ connect(
+ this, &CommunitiesList::avatarRetrieved, this, &CommunitiesList::updateCommunityAvatar);
+}
+
+void
+CommunitiesList::setCommunities(const mtx::responses::JoinedGroups &response)
+{
+ communities_.clear();
+
+ addGlobalItem();
+
+ for (const auto &group : response.groups)
+ addCommunity(group);
+
+ communities_["world"]->setPressedState(true);
+ emit communityChanged("world");
+}
+
+void
+CommunitiesList::addCommunity(const std::string &group_id)
+{
+ const auto id = QString::fromStdString(group_id);
+
+ CommunitiesListItem *list_item = new CommunitiesListItem(id, scrollArea_);
+ communities_.emplace(id, QSharedPointer<CommunitiesListItem>(list_item));
+ contentsLayout_->insertWidget(contentsLayout_->count() - 1, list_item);
+
+ connect(this,
+ &CommunitiesList::groupProfileRetrieved,
+ this,
+ [this](const QString &id, const mtx::responses::GroupProfile &profile) {
+ if (communities_.find(id) == communities_.end())
+ return;
+
+ communities_.at(id)->setName(QString::fromStdString(profile.name));
+
+ if (!profile.avatar_url.empty())
+ fetchCommunityAvatar(id,
+ QString::fromStdString(profile.avatar_url));
+ });
+ connect(this,
+ &CommunitiesList::groupRoomsRetrieved,
+ this,
+ [this](const QString &id, const std::vector<QString> &rooms) {
+ if (communities_.find(id) == communities_.end())
+ return;
+
+ communities_.at(id)->setRooms(rooms);
+ });
+ connect(list_item,
+ &CommunitiesListItem::clicked,
+ this,
+ &CommunitiesList::highlightSelectedCommunity);
+
+ http::client()->group_profile(
+ group_id, [id, this](const mtx::responses::GroupProfile &res, mtx::http::RequestErr err) {
+ if (err) {
+ return;
+ }
+
+ emit groupProfileRetrieved(id, res);
+ });
+
+ http::client()->group_rooms(
+ group_id, [id, this](const nlohmann::json &res, mtx::http::RequestErr err) {
+ if (err) {
+ return;
+ }
+
+ std::vector<QString> room_ids;
+ for (const auto &room : res.at("chunk"))
+ room_ids.push_back(QString::fromStdString(room.at("room_id")));
+
+ emit groupRoomsRetrieved(id, room_ids);
+ });
+}
+
+void
+CommunitiesList::updateCommunityAvatar(const QString &community_id, const QPixmap &img)
+{
+ if (!communityExists(community_id)) {
+ qWarning() << "Avatar update on nonexistent community" << community_id;
+ return;
+ }
+
+ communities_.at(community_id)->setAvatar(img.toImage());
+}
+
+void
+CommunitiesList::highlightSelectedCommunity(const QString &community_id)
+{
+ if (!communityExists(community_id)) {
+ qDebug() << "CommunitiesList: clicked unknown community";
+ return;
+ }
+
+ emit communityChanged(community_id);
+
+ for (const auto &community : communities_) {
+ if (community.first != community_id) {
+ community.second->setPressedState(false);
+ } else {
+ community.second->setPressedState(true);
+ scrollArea_->ensureWidgetVisible(community.second.data());
+ }
+ }
+}
+
+void
+CommunitiesList::fetchCommunityAvatar(const QString &id, const QString &avatarUrl)
+{
+ auto savedImgData = cache::client()->image(avatarUrl);
+ if (!savedImgData.isNull()) {
+ QPixmap pix;
+ pix.loadFromData(savedImgData);
+ emit avatarRetrieved(id, pix);
+ return;
+ }
+
+ if (avatarUrl.isEmpty())
+ return;
+
+ mtx::http::ThumbOpts opts;
+ opts.mxc_url = avatarUrl.toStdString();
+ http::client()->get_thumbnail(
+ opts, [this, opts, id](const std::string &res, mtx::http::RequestErr err) {
+ if (err) {
+ nhlog::net()->warn("failed to download avatar: {} - ({} {})",
+ opts.mxc_url,
+ mtx::errors::to_string(err->matrix_error.errcode),
+ err->matrix_error.error);
+ return;
+ }
+
+ cache::client()->saveImage(opts.mxc_url, res);
+
+ auto data = QByteArray(res.data(), res.size());
+
+ QPixmap pix;
+ pix.loadFromData(data);
+
+ emit avatarRetrieved(id, pix);
+ });
+}
+
+std::vector<QString>
+CommunitiesList::roomList(const QString &id) const
+{
+ if (communityExists(id))
+ return communities_.at(id)->rooms();
+
+ return {};
+}
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