How do I detect an F1 keypress?

[Mark]

At the moment I have this (using the rust bindings):

```rust

    main_window.handle(move |_, event| match event {
        fltk::enums::Event::KeyUp => {
            match fltk::app::event_key() {
                // TODO | F1
                fltk::enums::Key::Help => sender.send(WindowAction::Help),
                _ => {}
            }
            false
        }
        _ => false,
    });
```

But I can't figure out what I need to do to detect F1.

[Albrecht Schlosser]

I can't speak for the Rust bindings, but in C++ you would use 'FL_F+n'
for Fn where 'n' is a numeric value, hence F1 would be FL_F+1.

Key values are defined in FL/Enumerations.H, specifically here:
https://github.com/fltk/fltk/blob/36af6a57295a5f3c674134cab60dc644c96e97fa/FL/Enumerations.H#L477

[Mark]

You can't convert between enums (which is how the keys are defined in fltk-rs) and ints so I've reported it as a bug and asked the maintainer to add Key::F1 etc.

Thanks.

[Bill Spitzak]

Could Rust support some kind of inline function, like FL_F(1)? It would be useful to be able to convert from an integer to a function key number.

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[Mo_Al_]

I've added function keys from F1 thru F12. I understand there are some keyboards with more function keys, so I've also added a const function (like C++ constexpr) to generate a function key. Key::fn_key(n), These can't be used in match statements since Rust disallows function calls in the match, however they can be defined beforehand and used in the match:

win.handle(|w, ev| match ev {

        Event::KeyUp => match app::event_key() {

            Key::F2 => {

                dbg!("F2");

                true

            }

            _ => false,

        },

        _ => false,

    });

using fn_key():

    const F12: Key = Key::fn_key(12); // the value can be inlined in the match

    win.handle(|w, ev| match ev {

        Event::KeyUp => match app::event_key() {

            F12 => {

                dbg!("F12");

                true

            }

            _ => false,

        },

        _ => false,

    });