Hi everyone, is it possible to allow shiny to show some messages while user are waiting for the result of the computation? For example, for a function that would take a long time, a user would see this, which is something gray. However, I want to user to know more about what is going on, such as showing "Computing XXX", like what we would see on a well designed web app. I know an error or a warning would be shown on the screen, but is there any other way besides them?

It would be even better if some loading anime can be shown.