Add User Mentions Dialog

Add a RoomListItem-like button that opens a dialog
containing all of the messages that would result in a
highlight from the server (for example, the user is mentioned,
or @room is mentioned).

This is VERY rudimentary and will be completely reworked in the future
to take advantage of the existing TimelineView class, instead of
using a dialog like it does now. The button to show the mentions
also needs work.

2 files changed, 85 insertions, 0 deletions

diff --git a/src/dialogs/UserMentions.cpp b/src/dialogs/UserMentions.cpp
new file mode 100644

index 00000000..1a6c17e5
--- /dev/null
+++ b/src/dialogs/UserMentions.cpp
@@ -0,0 +1,59 @@
+#include <QTimer>
+
+#include "UserMentions.h"
+#include "timeline/TimelineItem.h"
+
+using namespace dialogs;
+
+UserMentions::UserMentions(QWidget *parent)
+          : QWidget{parent}
+{
+        top_layout_ = new QVBoxLayout(this);
+        top_layout_->setSpacing(0);
+        top_layout_->setMargin(0);
+
+        scroll_area_ = new QScrollArea(this);
+        scroll_area_->setWidgetResizable(true);
+        scroll_area_->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+
+        scroll_widget_ = new QWidget(this);
+        scroll_widget_->setObjectName("scroll_widget");
+
+        // Height of the typing display.
+        QFont f;
+        f.setPointSizeF(f.pointSizeF() * 0.9);
+        const int bottomMargin = QFontMetrics(f).height() + 6;
+
+        scroll_layout_ = new QVBoxLayout(scroll_widget_);
+        scroll_layout_->setContentsMargins(4, 0, 15, bottomMargin);
+        scroll_layout_->setSpacing(0);
+        scroll_layout_->setObjectName("timelinescrollarea");
+
+        scroll_area_->setWidget(scroll_widget_);
+        scroll_area_->setAlignment(Qt::AlignBottom);
+
+        top_layout_->addWidget(scroll_area_);
+
+        setLayout(top_layout_);
+}
+
+void
+UserMentions::pushItem(const QString &event_id, const QString &user_id, const QString &body, const QString &room_id) {
+        TimelineItem *view_item =
+          new TimelineItem(mtx::events::MessageType::Text,
+                           user_id,
+                           body,
+                           true,
+                           room_id,
+                           scroll_widget_);
+                view_item->setEventId(event_id);
+                setUpdatesEnabled(false);
+                view_item->hide();
+
+                scroll_layout_->addWidget(view_item);
+                QTimer::singleShot(0, this, [view_item, this]() {
+                        view_item->show();
+                        view_item->adjustSize();
+                        setUpdatesEnabled(true);
+                });
+}
\ No newline at end of file
diff --git a/src/dialogs/UserMentions.h b/src/dialogs/UserMentions.h
new file mode 100644

index 00000000..ff68d8c8
--- /dev/null
+++ b/src/dialogs/UserMentions.h
@@ -0,0 +1,26 @@
+#pragma once
+
+#include <QWidget>
+#include <QVBoxLayout>
+#include <QScrollArea>
+#include <QScrollBar>
+
+namespace dialogs {
+
+class UserMentions : public QWidget
+{
+        Q_OBJECT
+public:
+        UserMentions(QWidget *parent = nullptr);
+        void pushItem(const QString &event_id, const QString &user_id, const QString &body, const QString &room_id);
+private:
+        QVBoxLayout *top_layout_;
+        QVBoxLayout *scroll_layout_;
+
+        QScrollArea *scroll_area_;
+        QWidget *scroll_widget_;
+
+
+};
+
+}
\ No newline at end of file