[Issue] review function naming

[m50S79sM6SRNp8Jn]

It's important to use consistent and accurate naming conventions in programming to make code more understandable and maintainable.

on_date_change is really on_date_changed on_progress_change is really on_progress_changed on_view_change is really on_view_changed <other?>

Actually, I prefer to have both the on...change and the on...changed functions (not a simple renaming).

Anyhow, you will have a breaking change.