Function gtk::idle_add

pub fn idle_add<F>(func: F) -> SourceId where
    F: FnMut() -> Continue + 'static, 

Adds a closure to be called by the default main loop when it's idle.

func will be called repeatedly until it returns Continue(false).

Similar to glib::idle_add but only callable from the main thread and doesn't require Send. It is the same as glib::idle_add_local.