react-native-jsmodal/src/animations/SlideAnimation.js

React Native Modals Library for IOS & Android.

// @flow

import { Animated, Dimensions } from 'react-native';
import Animation, { type AnimationConfig } from './Animation';

const {
  width: SCREEN_WIDTH,
  height: SCREEN_HEIGHT,
} = Dimensions.get('window');

type SlideFrom = 'top' | 'bottom' | 'left' | 'right';
type SlideAnimationConfig = AnimationConfig & {
  slideFrom?: SlideFrom,
}

export default class SlideAnimation extends Animation {
  slideFrom: SlideFrom;

  static SLIDE_FROM_TOP = 'top';
  static SLIDE_FROM_BOTTOM = 'bottom';
  static SLIDE_FROM_LEFT = 'left';
  static SLIDE_FROM_RIGHT = 'right';

  constructor({
    initialValue = 0,
    useNativeDriver = true,
    slideFrom = SlideAnimation.SLIDE_FROM_BOTTOM,
  }: SlideAnimationConfig = {}) {
    super({ initialValue, useNativeDriver });
    this.slideFrom = slideFrom;
  }

  in(onFinished?: Function = () => {}, options = {}): void {
    Animated.spring(this.animate, {
      toValue: 1,
      velocity: 0,
      tension: 65,
      friction: 11,
      useNativeDriver: this.useNativeDriver,
      ...options,
    }).start(onFinished);
  }

  out(onFinished?: Function = () => {}, options = {}): void {
    Animated.spring(this.animate, {
      toValue: 0,
      velocity: 0,
      tension: 65,
      friction: 11,
      useNativeDriver: this.useNativeDriver,
      ...options,
    }).start(onFinished);
  }

  getAnimations(): Object {
    const transform = [];
    if (this.slideFrom === SlideAnimation.SLIDE_FROM_TOP) {
      transform.push({
        translateY: this.animate.interpolate({
          inputRange: [0, 1],
          outputRange: [-SCREEN_HEIGHT, 0],
        }),
      });
    } else if (this.slideFrom === SlideAnimation.SLIDE_FROM_BOTTOM) {
      transform.push({
        translateY: this.animate.interpolate({
          inputRange: [0, 1],
          outputRange: [SCREEN_HEIGHT, 0],
        }),
      });
    } else if (this.slideFrom === SlideAnimation.SLIDE_FROM_LEFT) {
      transform.push({
        translateX: this.animate.interpolate({
          inputRange: [0, 1],
          outputRange: [-SCREEN_WIDTH, 0],
        }),
      });
    } else if (this.slideFrom === SlideAnimation.SLIDE_FROM_RIGHT) {
      transform.push({
        translateX: this.animate.interpolate({
          inputRange: [0, 1],
          outputRange: [SCREEN_WIDTH, 0],
        }),
      });
    } else {
      throw new Error(`
        slideFrom: ${this.slideFrom} not supported. 'slideFrom' must be 'top' | 'bottom' | 'left' | 'right'
      `);
    }
    return {
      transform,
    };
  }
}