Method cacheRects

src/gridstack-engine.ts:287–298

* Cache the pixel rectangles for all nodes used for collision detection during drag operations. * This optimization converts grid coordinates to pixel coordinates for faster collision detection. * * @param w width of a single grid cell in pixels * @param h height of a single grid cell in

(w: number, h: number, top: number, right: number, bottom: number, left: number)

   * @internal This is typically called by GridStack during resize events
   */
  public cacheRects(w: number, h: number, top: number, right: number, bottom: number, left: number): GridStackEngine
  {
    this.nodes.forEach(n =>
      n._rect = {
        y: n.y * h + top,
        x: n.x * w + left,
        w: n.w * w - left - right,
        h: n.h * h - top - bottom
      }
    );
    return this;
  }

  /**
   * Attempt to swap the positions of two nodes if they meet swapping criteria.