void AddChatState(MessageModel msg)
{
DeleteOldChatState();
var buffer = OutputMessageTextView.Buffer;
buffer.AddMark(ChatStateStartPosition, buffer.EndIter);
OutputMessageTextView.AddMessage(msg, false, false);
ChatStatePositionValid = true;
}
void DeleteOldChatState()
{
if (!ChatStatePositionValid)
{
return;
}
var buffer = OutputMessageTextView.Buffer;
var start = buffer.GetIterAtMark(ChatStateStartPosition);
var end = buffer.EndIter;
buffer.Delete(ref start, ref end);
buffer.DeleteMark(ChatStateStartPosition);
if (buffer.EndIter.Offset < OutputMessageTextView.MarkerlineBufferPosition)
{
// in the rare case that the markeline is below the dots, move it to the correct position
OutputMessageTextView.UpdateMarkerline();
}
ChatStatePositionValid = false;
}
void UpdateChatState()
{
DeleteOldChatState();
if (LastPresenceMessage == null && TypingDots == null)
{
// nothing to display
return;
}
var buffer = OutputMessageTextView.Buffer;
buffer.AddMark(ChatStateStartPosition, buffer.EndIter);
if (TypingDots != null)
{
OutputMessageTextView.AddMessage(TypingDots, true, false);
}
if (LastPresenceMessage != null)
{
OutputMessageTextView.AddMessage(LastPresenceMessage, false);
}
ChatStatePositionValid = true;
}