react-native-reanimated#lessThan TypeScript Examples

The following examples show how to use react-native-reanimated#lessThan. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: useTiming.ts    From react-native-paper-onboarding with MIT License 4 votes vote down vote up 
useTiming = ({
  animatedStaticIndex,
  animatedOverrideIndex,
  value,
  velocity,
  state,
  size,
  screenWidth,
}: useTimingProps) => {
  const clock = useClock();
  const isManuallyAnimated = useValue(0);

  const config = useMemo(
    () => ({
      toValue: new Animated.Value(0),
      duration: 500,
      easing: Easing.out(Easing.exp),
    }),
    []
  );

  const animationState = useMemo(
    () => ({
      finished: new Animated.Value(0),
      position: new Animated.Value(0),
      frameTime: new Animated.Value(0),
      time: new Animated.Value(0),
    }),
    []
  );

  const valueClamp = useMemo(
    () =>
      interpolate(value, {
        inputRange: [screenWidth * -1, 0, screenWidth],
        outputRange: I18nManager.isRTL ? [-1, 0, 1] : [1, 0, -1],
        extrapolate: Animated.Extrapolate.CLAMP,
      }),
    [value, screenWidth]
  );

  const velocityClamp = useMemo(
    () =>
      interpolate(velocity, {
        inputRange: [screenWidth * -2, 0, screenWidth * 2],
        outputRange: I18nManager.isRTL ? [-0.5, 0, 0.5] : [0.5, 0, -0.5],
        extrapolate: Animated.Extrapolate.CLAMP,
      }),
    [screenWidth, velocity]
  );

  const isTimingInterrupted = and(eq(state, State.BEGAN), clockRunning(clock));
  const finishTiming = useMemo(
    () => [
      set(animatedStaticIndex, config.toValue),
      set(animatedOverrideIndex, config.toValue),
      set(animationState.frameTime, 0),
      set(animationState.time, 0),
      set(state, State.UNDETERMINED),
      set(isManuallyAnimated, 0),
      stopClock(clock),
    ],
    [
      state,
      animatedOverrideIndex,
      animatedStaticIndex,
      animationState.frameTime,
      animationState.time,
      clock,
      config.toValue,
      isManuallyAnimated,
    ]
  );

  const shouldAnimate = useMemo(
    () =>
      and(
        not(and(eq(animatedStaticIndex, 0), lessThan(valueClamp, 0))),
        not(and(eq(animatedStaticIndex, size - 1), greaterThan(valueClamp, 0)))
      ),
    [animatedStaticIndex, size, valueClamp]
  );
  const shouldReset = useMemo(
    () => not(greaterThan(add(abs(valueClamp), abs(velocityClamp)), 0.5)),
    [valueClamp, velocityClamp]
  );
  const shouldAnimateNext = useMemo(
    () =>
      greaterThan(
        add(animationState.position, velocityClamp),
        animatedStaticIndex
      ),
    [animatedStaticIndex, animationState.position, velocityClamp]
  );

  const animatedPosition = useMemo(
    () =>
      block([
        cond(isTimingInterrupted, finishTiming),
        cond(
          eq(state, State.ACTIVE),
          cond(
            and(
              not(and(eq(animatedStaticIndex, 0), lessThan(valueClamp, 0))),
              not(
                and(
                  eq(animatedStaticIndex, size - 1),
                  greaterThan(valueClamp, 0)
                )
              )
            ),
            [
              set(animationState.finished, 0),
              set(
                animationState.position,
                add(animatedStaticIndex, valueClamp)
              ),
            ]
          )
        ),

        onChange(animatedOverrideIndex, [
          set(isManuallyAnimated, 1),
          set(animationState.finished, 0),
        ]),

        cond(or(eq(state, State.END), isManuallyAnimated), [
          cond(and(not(clockRunning(clock)), not(animationState.finished)), [
            cond(
              isManuallyAnimated,
              set(config.toValue, animatedOverrideIndex),
              cond(
                or(shouldReset, not(shouldAnimate)),
                set(config.toValue, animatedStaticIndex),
                cond(
                  shouldAnimateNext,
                  set(config.toValue, add(animatedStaticIndex, 1)),
                  set(config.toValue, sub(animatedStaticIndex, 1))
                )
              )
            ),
            set(animationState.finished, 0),
            set(animationState.frameTime, 0),
            set(animationState.time, 0),
            startClock(clock),
          ]),
          timing(clock, animationState, config),
          cond(animationState.finished, finishTiming),
        ]),

        animationState.position,
      ]),
    [
      size,
      state,
      animatedOverrideIndex,
      animatedStaticIndex,
      animationState,
      clock,
      config,
      finishTiming,
      isManuallyAnimated,
      isTimingInterrupted,
      shouldAnimate,
      shouldAnimateNext,
      shouldReset,
      valueClamp,
    ]
  );
  return animatedPosition;
}