initializer method

void initializer(TickerProvider ticker)

animation initializer

Implementation

void initializer(TickerProvider ticker) {
  if (_controller != null) {
    return;
  }
  _controller = AnimationController(
    vsync: ticker,
    duration: duration,
    reverseDuration: reverseDuration,
    value: initialValue,
    lowerBound: lowerBound,
    upperBound: upperBound,
    animationBehavior: animationBehavior,
  );

  repeatStatusListenerListener = (status) {
    if (status != AnimationStatus.completed &&
        status != AnimationStatus.dismissed) {
      _reverseCurvedAnimation = null;
      return;
    }
    // if (repeats == null) {
    //   isAnimating = false;
    //   endAnimationListener?.call();
    //   return;
    // }
    if (skipDismissStatus) {
      return;
    }
    repeatCount ??= repeats ?? 1;

    if (repeatCount == 1) {
      isAnimating = false;
      if (animationEndFuture?.isCompleted == false) {
        animationEndFuture!.complete();
        animationEndFuture = null;
      }
      endAnimationListener?.call();
      repeatCount = null;
      WidgetsBinding.instance.scheduleFrameCallback((_) {
        notify(); //TODO Check me. Used to trigger a rebuild after animation ends
      });
    } else {
      if (status == AnimationStatus.completed) {
        if (repeatCount! > 1) repeatCount = repeatCount! - 1;
        if (shouldReverseRepeats) {
          _controller!.reverse();
        } else {
          skipDismissStatus = true;
          _controller!.value = lowerBound;
          skipDismissStatus = false;
          _controller!.forward();
        }
      } else if (status == AnimationStatus.dismissed) {
        if (repeatCount! > 1) repeatCount = repeatCount! - 1;
        if (shouldReverseRepeats) {
          _controller!.forward();
        } else {
          skipDismissStatus = true;
          _controller!.value = upperBound;
          skipDismissStatus = false;
          _controller!.reverse();
        }
      }
    }
  };

  _controller!
    ..addListener(() {
      snapValue = snapValue.copyToHasData(_controller!.value);
      notify();
    })
    ..addStatusListener(repeatStatusListenerListener);
  onInitialized?.call(this);
  if (shouldAutoStart) {
    triggerAnimation();
  }
}