Replace ScrollView and Animated with gesturehandler and reanimated

[Naturalclar]

Platforms affected

iOS, Android

What does this PR do?

This PR is part of #632
replaces Animated, Easing, ScrollView, and FlatList provided by react-native with react-native-gesture-handler and react-native-reanimated

What testing has been done on this change?

Ran example App on iOS and Android Simulators

Tested features checklist

• Default setup (example)
• Carousels with and without momentum enabled (prop enableMomentum)
• Vertical carousels (prop vertical)
• Slide alignment (prop activeSlideAlignment)
• Autoplay (prop autoplay)
• Loop mode (prop loop)
• ScrollView/FlatList carousels (prop useScrollView)
• Callback methods
• ParallaxImage component
• Pagination component
• Layouts and custom interpolations

[bd-arc]

Hi @Naturalclar,

Thanks for taking the first step in the right direction for this plugin 👍

Do you mind expanding on the benefits the PR provides? Unless I'm mistaken, there will be no visible effect for the users at this point, am I right?

And please don't forget to ping me when you create a PR, otherwise I will only stumble upon it randomly like I just did ;-)

[CesarGomezTissini]

Agree! For example, some props for Pagination component (like animatedTension) aren't availables for use yet.

[radko93]

Is there any benefit in the migration?

[vamshi9666]

yes. reanimated uses declarative api, rather than .start() and .stop().So all animated values will be declared and manipulated on ui thread and doesn't depend on any js operation.
In this video Varun explains, why reanimated is smoother

[vamshi9666]

reanimated dont have .parllel() method.
Moreover just changing imports isn't gonna do the trick.

[radko93]

I don't think it will be any better with just changing imports especially because of software-mansion/react-native-reanimated#194

[vamshi9666]

@radko93 are you thinking about migrating to reanimated ?

[radko93]

@vamshi9666 not at the moment. It might not be beneficial (look at the link I've posted)

[vamshi9666]

I did. I even tried to repro his hypothesis. To be honest ,i didn't see any lags or framedrops.