Add utils.showFloatingGamepadTextInput()

[dfabulich]

This one was pretty weird, due to the callback.

Unlike all other callbacks in steamworks-rs, the show_gamepad_text_input and show_floating_gamepad_text_input functions expect a dismissed_cb callback as an argument to the function.

https://github.com/Noxime/steamworks-rs/blob/e9cdf88f1c436871e2f72d9726da6eceac0679d4/src/utils.rs#L281

    /// Opens a floating keyboard over the game content and sends OS keyboard keys directly to the game.
    ///
    /// The text field position is specified in pixels relative the origin of the game window and is used to
    /// position the floating keyboard in a way that doesn't cover the text field.
    ///
    /// Callback is triggered when user dismisses the text input
    pub fn show_floating_gamepad_text_input<F>(
        &self,
        keyboard_mode: FloatingGamepadTextInputMode,
        x: i32,
        y: i32,
        width: i32,
        height: i32,
        mut dismissed_cb: F,
    ) -> bool
    where
        F: FnMut() + 'static + Send, // TODO: Support FnOnce callbacks
    {
        unsafe {
            register_callback(&self._inner, move |_: FloatingGamepadTextInputDismissed| {
                dismissed_cb();
            });
            sys::SteamAPI_ISteamUtils_ShowFloatingGamepadTextInput(
                self.utils,
                keyboard_mode.into(),
                x,
                y,
                width,
                height,
            )
        }
    }

The FloatingGamepadTextInputDismissed struct simply doesn't have #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))] as other callback structs do, so when I tried adding FloatingGamepadTextInputDismissed to callback.rs here in steamworks.js, the compile failed when I tried to register_callback::<steamworks::FloatingGamepadTextInputDismissed>(threadsafe_handler).

I guess I could investigate fixing that as a bug in steamworks-rs, but I don't actually happen to need the FloatingGamepadTextInputDismissed callback, myself, so, in this PR, I'm just passing show_floating_gamepad_text_input an empty callback, just to satisfy the compiler. Presumably, if someone needs the FloatingGamepadTextInputDismissed callback, they can implement it themselves (perhaps adding serde support to FloatingGamepadTextInputDismissed in steamworks-rs first, then getting that merged, and then adding it to callback.rs here.

[dfabulich]

Would it be possible to implement a JS-based callback parameter in this case? It'd be awesome if the end user could write code like this:

showFloatingGamepadTextInput(FloatingGamepadTextInputMode.SingleLine, x, y, width, number, () => {
    console.log('callback, input dismissed');
});

My NAPI skills are still pretty weak. (I mostly write these PRs by copying and pasting! 🫠)

Implementing that would also be necessary in order to implement the non-floating showGamepadTextInput method, which returns the typed text in a callback as a string.

[ceifa]

Would it be possible to implement a JS-based callback parameter in this case? It'd be awesome if the end user could write code like this:

showFloatingGamepadTextInput(FloatingGamepadTextInputMode.SingleLine, x, y, width, number, () => {
    console.log('callback, input dismissed');
});

Agreed. We can do it with a threadsafe function on napi. I can work on it later

[vsobotka]

If I understand correctly, this will enable us to open virtual keyboard on Steam Deck, when an input is clicked, is that correct? What is the current state? Is there some workaround until this is released?

[dfabulich]

There's no workaround; we just have to wait. (Unless you know enough NAPI to fix callbacks in my PR…?)