Function compactItemVertical

src/core/compactors.ts:90–116

(
  compareWith: Layout,
  l: LayoutItem,
  fullLayout: Layout,
  maxY: number
)

 * @returns The compacted item
 */
export function compactItemVertical(
  compareWith: Layout,
  l: LayoutItem,
  fullLayout: Layout,
  maxY: number
): LayoutItem {
  // Correct negative positions first
  (l as Mutable<LayoutItem>).x = Math.max(l.x, 0);
  (l as Mutable<LayoutItem>).y = Math.max(l.y, 0);

  // Limit Y to the current bottom
  (l as Mutable<LayoutItem>).y = Math.min(maxY, l.y);

  // Move up as far as possible
  while (l.y > 0 && !getFirstCollision(compareWith, l)) {
    (l as Mutable<LayoutItem>).y--;
  }

  // Resolve collisions by moving down
  let collision: LayoutItem | undefined;
  while ((collision = getFirstCollision(compareWith, l)) !== undefined) {
    resolveCompactionCollision(fullLayout, l, collision.y + collision.h, "y");
  }

  (l as Mutable<LayoutItem>).y = Math.max(l.y, 0);
  return l;
}

/**
 * Compact a single item horizontally (move left).