New Reanimated API

[kirillzyusko]

Is your feature request related to a problem?

Right now Reanimated API just copies standard Animated API (just returns an Animated/Reanimated value). Though Reanimated can offer more powerful API like useAnimatedScrollHandler which allows you to gradually control every aspect of animation.

Having such API could help to create more powerful animations (like "step behind animation" (to create kind of parallax effect) - when you skip first frame, and then runs your animation one frame behind). Especially it could be useful on older Android devices, when keyboard is not perfectly synchronised with animated values - just theoretically we could use withTiming in each frame and thus animation could look much smoother (just theoretically 😄)

Describe the solution you'd like

Would be good to introduce new hook useKeyboardHandler/useAnimatedKeyboard (didn't think about the name a lot) with following API:

useKeyboardHandler({
  onStart: (e, ctx) => {},
  onProgress: (e, ctx) => {}, // or `onMove`
  // onChange: (e, ctx) => {}, <-- optional, when on Android keyboard is already shown and just changes its size, because of the change of the mode (i. e. you typed text and then decided to put an emoji- keyboard may changeits size)
  onEnd: (e, ctx) => {}
});

Describe alternatives you've considered

There is no known alternatives at the moment, but it's just rough idea. During the implementation it could be polish and adopted to real use cases.

Additional context

I think theoretically it shouldn't be too difficult to add such API. Just need to understand whether it brings additional benefits. Maybe would be good to create a small demo in example to show the difference, between the standard approach and new one.

[kirillzyusko]

This feature was added in 1.4.0 😊