fltk 1.3.28

//!A counter using event handling.
//!
//!The code can be found in the `examples` directory next to the `src` directory in the source distribution.
//!
//!### Description
//!Contains a button for increment and decrement each. Uses an
//![`Event`](crate::enums::Event) based approach calling
//![`handle`](crate::prelude::WidgetBase::handle) on the
//![`frame`](crate::frame::Frame) that contains the counter string.