TouchRippleSpreadingEffect constructor

TouchRippleSpreadingEffect({ required TouchRippleContext context, required VoidCallback callback, required bool isRejectable, required Offset baseOffset, required TouchRippleBehavior behavior, })

Implementation

TouchRippleSpreadingEffect({
  required this.context,
  required this.callback,
  required this.isRejectable,
  required this.baseOffset,
  required this.behavior,
}) {
  assert(behavior.spreadDuration != null);
  assert(behavior.spreadCurve != null);
  _spreadAnimation = AnimationController(vsync: context.vsync, duration: behavior.spreadDuration!);
  _spreadCurved = CurvedAnimation(parent: _spreadAnimation, curve: behavior.spreadCurve!);

  // Calls the event callback function when the current animation
  // progress can call the event callback function.
  void checkEventCallBack() {
    assert(behavior.lowerPercent != null, "Lower percent of touch ripple behavior was not initialized.");
    assert(behavior.upperPercent != null, "Upper percent of touch ripple behavior was not initialized.");
    final lowerPercent = behavior.lowerPercent ?? 0;

    if (this.isRejectable) return;
    if (this.isAttached && spreadPercent >= (behavior.eventCallBackableMinPercent ?? lowerPercent)) {
      callback.call();
      // Deregisters the listener as there is no longer a need to know
      // when to invoke the event callback function.
      _spreadAnimation.removeListener(checkEventCallBack);
    }
  }

  _spreadAnimation.addListener(checkEventCallBack);
  _spreadAnimation.addStatusListener((status) {
    if (status == AnimationStatus.forward) {
      _fadeAnimation.forward();
    }

    if (status == AnimationStatus.completed && isRejectable == false) {
      _fadeAnimation.reverse();
    }
  });

  assert(behavior.fadeInDuration != null);
  assert(behavior.fadeInCurve != null);
  _fadeAnimation = AnimationController(
    vsync: context.vsync,
    duration: behavior.fadeInDuration!,
    reverseDuration: behavior.fadeOutDuration!
  );
  _fadeCurved = CurvedAnimation(
    parent: _fadeAnimation,
    curve: behavior.fadeInCurve!,
    reverseCurve: behavior.fadeOutCurve!
  );

  _fadeAnimation.addStatusListener((status) {
    if (status == AnimationStatus.dismissed) dispose();
  });

  isInitialized = true;
}