diff --git a/include/timeline/TimelineView.h b/include/timeline/TimelineView.h
new file mode 100644
index 00000000..898a304e
--- /dev/null
+++ b/include/timeline/TimelineView.h
@@ -0,0 +1,310 @@
+/*
+ * nheko Copyright (C) 2017 Konstantinos Sideris <siderisk@auth.gr>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <QApplication>
+#include <QDebug>
+#include <QLayout>
+#include <QList>
+#include <QQueue>
+#include <QScrollArea>
+#include <QSettings>
+#include <QStyle>
+#include <QStyleOption>
+
+#include "Emote.h"
+#include "File.h"
+#include "Image.h"
+#include "MatrixClient.h"
+#include "MessageEvent.h"
+#include "Notice.h"
+#include "Text.h"
+#include "TimelineItem.h"
+
+class FloatingButton;
+class RoomMessages;
+class ScrollBar;
+class Timeline;
+struct DescInfo;
+
+namespace msgs = matrix::events::messages;
+namespace events = matrix::events;
+
+// Contains info about a message shown in the history view
+// but not yet confirmed by the homeserver through sync.
+struct PendingMessage
+{
+ matrix::events::MessageEventType ty;
+ int txn_id;
+ QString body;
+ QString filename;
+ QString event_id;
+ TimelineItem *widget;
+
+ PendingMessage(matrix::events::MessageEventType ty,
+ int txn_id,
+ QString body,
+ QString filename,
+ QString event_id,
+ TimelineItem *widget)
+ : ty(ty)
+ , txn_id(txn_id)
+ , body(body)
+ , filename(filename)
+ , event_id(event_id)
+ , widget(widget)
+ {}
+};
+
+// In which place new TimelineItems should be inserted.
+enum class TimelineDirection
+{
+ Top,
+ Bottom,
+};
+
+class TimelineView : public QWidget
+{
+ Q_OBJECT
+
+public:
+ TimelineView(const Timeline &timeline,
+ QSharedPointer<MatrixClient> client,
+ const QString &room_id,
+ QWidget *parent = 0);
+ TimelineView(QSharedPointer<MatrixClient> client,
+ const QString &room_id,
+ QWidget *parent = 0);
+
+ // Add new events at the end of the timeline.
+ int addEvents(const Timeline &timeline);
+ void addUserMessage(matrix::events::MessageEventType ty, const QString &msg);
+
+ template<class Widget, events::MessageEventType MsgType>
+ void addUserMessage(const QString &url, const QString &filename);
+ void updatePendingMessage(int txn_id, QString event_id);
+ void scrollDown();
+
+public slots:
+ void sliderRangeChanged(int min, int max);
+ void sliderMoved(int position);
+ void fetchHistory();
+
+ // Add old events at the top of the timeline.
+ void addBackwardsEvents(const QString &room_id, const RoomMessages &msgs);
+
+ // Whether or not the initial batch has been loaded.
+ bool hasLoaded() { return scroll_layout_->count() > 1 || isTimelineFinished; }
+
+ void handleFailedMessage(int txnid);
+
+private slots:
+ void sendNextPendingMessage();
+
+signals:
+ void updateLastTimelineMessage(const QString &user, const DescInfo &info);
+ void clearUnreadMessageCount(const QString &room_id);
+
+protected:
+ void paintEvent(QPaintEvent *event) override;
+ void showEvent(QShowEvent *event) override;
+ bool event(QEvent *event) override;
+
+private:
+ void init();
+ void addTimelineItem(TimelineItem *item, TimelineDirection direction);
+ void updateLastSender(const QString &user_id, TimelineDirection direction);
+ void notifyForLastEvent();
+ void readLastEvent() const;
+ QString getLastEventId() const;
+
+ template<class Event, class Widget>
+ TimelineItem *processMessageEvent(const QJsonObject &event, TimelineDirection direction);
+
+ // TODO: Remove this eventually.
+ template<class Event>
+ TimelineItem *processMessageEvent(const QJsonObject &event, TimelineDirection direction);
+
+ // For events with custom display widgets.
+ template<class Event, class Widget>
+ TimelineItem *createTimelineItem(const Event &event, bool withSender);
+
+ // For events without custom display widgets.
+ // TODO: All events should have custom widgets.
+ template<class Event>
+ TimelineItem *createTimelineItem(const Event &event, bool withSender);
+
+ // Used to determine whether or not we should prefix a message with the
+ // sender's name.
+ bool isSenderRendered(const QString &user_id, TimelineDirection direction);
+
+ bool isPendingMessage(const QString &txnid, const QString &sender, const QString &userid);
+ void removePendingMessage(const QString &txnid);
+
+ bool isDuplicate(const QString &event_id) { return eventIds_.contains(event_id); }
+
+ void handleNewUserMessage(PendingMessage msg);
+
+ // Return nullptr if the event couldn't be parsed.
+ TimelineItem *parseMessageEvent(const QJsonObject &event, TimelineDirection direction);
+
+ QVBoxLayout *top_layout_;
+ QVBoxLayout *scroll_layout_;
+
+ QScrollArea *scroll_area_;
+ ScrollBar *scrollbar_;
+ QWidget *scroll_widget_;
+
+ QString lastSender_;
+ QString firstSender_;
+ QString room_id_;
+ QString prev_batch_token_;
+ QString local_user_;
+
+ bool isPaginationInProgress_ = false;
+
+ // Keeps track whether or not the user has visited the view.
+ bool isInitialized = false;
+ bool isTimelineFinished = false;
+ bool isInitialSync = true;
+
+ const int SCROLL_BAR_GAP = 200;
+
+ QTimer *paginationTimer_;
+
+ int scroll_height_ = 0;
+ int previous_max_height_ = 0;
+
+ int oldPosition_;
+ int oldHeight_;
+
+ FloatingButton *scrollDownBtn_;
+
+ TimelineDirection lastMessageDirection_;
+
+ // The events currently rendered. Used for duplicate detection.
+ QMap<QString, bool> eventIds_;
+ QQueue<PendingMessage> pending_msgs_;
+ QList<PendingMessage> pending_sent_msgs_;
+ QSharedPointer<MatrixClient> client_;
+};
+
+template<class Widget, events::MessageEventType MsgType>
+void
+TimelineView::addUserMessage(const QString &url, const QString &filename)
+{
+ QSettings settings;
+ auto user_id = settings.value("auth/user_id").toString();
+ auto with_sender = lastSender_ != user_id;
+
+ auto widget = new Widget(client_, url, filename, this);
+
+ TimelineItem *view_item = new TimelineItem(widget, user_id, with_sender, scroll_widget_);
+ scroll_layout_->addWidget(view_item);
+
+ lastMessageDirection_ = TimelineDirection::Bottom;
+
+ QApplication::processEvents();
+
+ lastSender_ = user_id;
+
+ int txn_id = client_->incrementTransactionId();
+
+ PendingMessage message(MsgType, txn_id, url, filename, "", view_item);
+ handleNewUserMessage(message);
+}
+
+template<class Event>
+TimelineItem *
+TimelineView::createTimelineItem(const Event &event, bool withSender)
+{
+ TimelineItem *item = new TimelineItem(event, withSender, scroll_widget_);
+ return item;
+}
+
+template<class Event, class Widget>
+TimelineItem *
+TimelineView::createTimelineItem(const Event &event, bool withSender)
+{
+ auto eventWidget = new Widget(client_, event);
+ auto item = new TimelineItem(eventWidget, event, withSender, scroll_widget_);
+
+ return item;
+}
+
+template<class Event>
+TimelineItem *
+TimelineView::processMessageEvent(const QJsonObject &data, TimelineDirection direction)
+{
+ Event event;
+
+ try {
+ event.deserialize(data);
+ } catch (const DeserializationException &e) {
+ qWarning() << e.what() << data;
+ return nullptr;
+ }
+
+ if (isDuplicate(event.eventId()))
+ return nullptr;
+
+ eventIds_[event.eventId()] = true;
+
+ QString txnid = event.unsignedData().transactionId();
+ if (!txnid.isEmpty() && isPendingMessage(txnid, event.sender(), local_user_)) {
+ removePendingMessage(txnid);
+ return nullptr;
+ }
+
+ auto with_sender = isSenderRendered(event.sender(), direction);
+
+ updateLastSender(event.sender(), direction);
+
+ return createTimelineItem<Event>(event, with_sender);
+}
+
+template<class Event, class Widget>
+TimelineItem *
+TimelineView::processMessageEvent(const QJsonObject &data, TimelineDirection direction)
+{
+ Event event;
+
+ try {
+ event.deserialize(data);
+ } catch (const DeserializationException &e) {
+ qWarning() << e.what() << data;
+ return nullptr;
+ }
+
+ if (isDuplicate(event.eventId()))
+ return nullptr;
+
+ eventIds_[event.eventId()] = true;
+
+ QString txnid = event.unsignedData().transactionId();
+ if (!txnid.isEmpty() && isPendingMessage(txnid, event.sender(), local_user_)) {
+ removePendingMessage(txnid);
+ return nullptr;
+ }
+
+ auto with_sender = isSenderRendered(event.sender(), direction);
+
+ updateLastSender(event.sender(), direction);
+
+ return createTimelineItem<Event, Widget>(event, with_sender);
+}
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