release method

Future<void> release(Release plan)

Implementation

Future<void> release(Release plan) async {
  final scaleHasMotion =
      plan.scale.decay.isNotEmpty || plan.scale.settle != null;
  if (!scaleHasMotion) {
    // No scale animation → axes are independent.
    setRect(rect.value);
    await Future.wait([
      _runAxis(plan.x, animateCenterX),
      _runAxis(plan.y, animateCenterY),
      _runAxis(plan.scale, animateWidth),
    ]);
    return;
  }
  // Decomposed-release: scale drives the proportional center; X/Y add a
  // translation offset on top. Each axis keeps its own curve/duration and
  // the displayed center stays consistent mid-frame.
  final initialRect = rect.value;
  final wFinal = plan.scale.settle?.to ?? plan.scale.decay.last.to;
  final scaleRatio = initialRect.width == 0 ? 1.0 : wFinal / initialRect.width;
  final xPropFinal = display.rect.center.dx
      + (initialRect.center.dx - display.rect.center.dx) * scaleRatio;
  final yPropFinal = display.rect.center.dy
      + (initialRect.center.dy - display.rect.center.dy) * scaleRatio;
  final xAbsTarget = plan.x.settle?.to
      ?? (plan.x.decay.isNotEmpty ? plan.x.decay.last.to : initialRect.center.dx);
  final yAbsTarget = plan.y.settle?.to
      ?? (plan.y.decay.isNotEmpty ? plan.y.decay.last.to : initialRect.center.dy);
  final xOffsetTarget = xAbsTarget - xPropFinal;
  final yOffsetTarget = yAbsTarget - yPropFinal;

  setReleaseDecomposed(
    initialX: initialRect.center.dx,
    initialY: initialRect.center.dy,
    initialWidth: initialRect.width,
    displayCenter: display.rect.center,
  );
  try {
    await Future.wait([
      animateCenterX(
        to: xOffsetTarget,
        duration: plan.x.settle?.duration,
        curve: plan.x.settle?.curve ?? Curves.easeOut,
      ),
      animateCenterY(
        to: yOffsetTarget,
        duration: plan.y.settle?.duration,
        curve: plan.y.settle?.curve ?? Curves.easeOut,
      ),
      _runAxis(plan.scale, animateWidth),
    ]);
  } finally {
    clearReleaseDecomposed();
  }
}