Add scroll to bottom FAB.

matrix/roomlistmodel.cpp

@@ -9,16 +9,23 @@ RoomListModel::RoomListModel(QObject* parent) : QAbstractListModel(parent) {}
 RoomListModel::~RoomListModel() {}
 
 void RoomListModel::setConnection(QMatrixClient::Connection* connection) {
+  Q_ASSERT(connection);
+
+  using QMatrixClient::Connection;
+  using QMatrixClient::Room;
   beginResetModel();
   m_connection = connection;
-  m_rooms.clear();
-  connect(connection, &QMatrixClient::Connection::newRoom, this,
-          &RoomListModel::addRoom);
-  for (QMatrixClient::Room* room : connection->roomMap().values()) {
-    connect(room, &QMatrixClient::Room::namesChanged, this,
-            &RoomListModel::namesChanged);
-    m_rooms.append(room);
-  }
+  connect(connection, &Connection::loggedOut, this,
+          [=] { setConnection(connection); });
+//  connect(connection, &Connection::invitedRoom, this,
+//          &RoomListModel::updateRoom);
+//  connect(connection, &Connection::joinedRoom, this,
+//          &RoomListModel::updateRoom);
+//  connect(connection, &Connection::leftRoom, this, &RoomListModel::updateRoom);
+  connect(connection, &Connection::aboutToDeleteRoom, this,
+          &RoomListModel::deleteRoom);
+
+  for (auto r : connection->roomMap()) addRoom(r);
   endResetModel();
 }
 
@@ -32,6 +39,15 @@ void RoomListModel::addRoom(QMatrixClient::Room* room) {
   endInsertRows();
 }
 
+void RoomListModel::deleteRoom(QMatrixClient::Room* room) {
+  const auto it = std::find(m_rooms.begin(), m_rooms.end(), room);
+  if (it == m_rooms.end()) return;  // Already deleted, nothing to do
+  const int row = it - m_rooms.begin();
+  beginRemoveRows(QModelIndex(), row, row);
+  m_rooms.erase(it);
+  endRemoveRows();
+}
+
 int RoomListModel::rowCount(const QModelIndex& parent) const {
   if (parent.isValid()) return 0;
   return m_rooms.count();

matrix/roomlistmodel.h

@@ -30,6 +30,7 @@ class RoomListModel : public QAbstractListModel {
   void namesChanged(QMatrixClient::Room* room);
   void unreadMessagesChanged(QMatrixClient::Room* room);
   void addRoom(QMatrixClient::Room* room);
+  void deleteRoom(QMatrixClient::Room* room);
 
  private:
   QMatrixClient::Connection* m_connection = nullptr;

qml/form/RoomForm.qml

@@ -144,8 +144,37 @@ Item {
 
                 ScrollBar.vertical: ScrollBar { /*anchors.left: messageListView.right*/ }
 
-                onAtYBeginningChanged: {
-                    if(currentRoom && atYBeginning) currentRoom.getPreviousContent(50)
+                Behavior on contentY {
+                    PropertyAnimation { easing.type: Easing.InOutCubic; duration: 200 }
+                }
+
+                RoundButton {
+                    id: goTopFab
+                    width: height
+                    height: !parent.atYEnd ? 64 : 0
+
+                    anchors.verticalCenter: parent.bottom
+                    anchors.verticalCenterOffset: -48
+                    anchors.horizontalCenter: parent.right
+                    anchors.horizontalCenterOffset: -48
+
+                    contentItem: MaterialIcon {
+                        anchors.fill: parent
+                        icon: "\ue313"
+                        color: "white"
+                    }
+
+                    opacity: hovered ? 1 : 0.5
+                    Material.background: Qt.lighter(Material.accent)
+
+                    onClicked: parent.positionViewAtBeginning()
+
+                    Behavior on height {
+                        PropertyAnimation { easing.type: Easing.InOutCubic; duration: 200 }
+                    }
+                    Behavior on opacity {
+                        PropertyAnimation { easing.type: Easing.InOutCubic; duration: 200 }
+                    }
                 }
             }