startAnimation method

void startAnimation(bool isDraggingInSameRow)

Start the rolling animation

Implementation

void startAnimation(bool isDraggingInSameRow) {
  bool isSlideToRight = destinationIndex > sourceIndex;
  bool isSlideToLeft = destinationIndex < sourceIndex;
  TickerFuture? animationFuture;
  if (isSlideToRight) {
    /// slide to right, use 'reverse', offset.x: -1.0 -> 0.0
    animationFuture = slideToLeftController.reverse(from: 1.0);
  } else if (isSlideToLeft) {
    /// slide to left, use 'reverse', offset.x: 1.0 -> 0.0
    animationFuture = slideToRightController.reverse(from: 1.0);
  }

  /// dragging in the same row/line, just return
  if (isDraggingInSameRow) return;

  /// TODO ... Hit the first/last one, in this case animation effect issue ...
  /// TODO ... Dragging one is the first/last one, in this case animation effect issue

  /// stick a ghost for the last/first position element
  if (isSlideToRight) {
    if (element.isTheLastOne) {
      setGhostType(GhostType.Next);
    }
  } else if (isSlideToLeft) {
    if (element.isTheFirstOne) {
      setGhostType(GhostType.Previous);
    }
  }
  if (ghostType != GhostType.None) {
    animationFuture?.then((value) {
      setGhostType(GhostType.None);
    });
  }
}