Method _packNodes

src/gridstack-engine.ts:457–492

@internal called to top gravity pack the items back OR revert back to original Y positions when floating

()

  /** @internal called to top gravity pack the items back OR revert back to original Y positions when floating */
  protected _packNodes(): GridStackEngine {
    if (this.batchMode) { return this; }
    this.sortNodes(); // first to last

    if (this.float) {
      // restore original Y pos
      this.nodes.forEach(n => {
        if (n._updating || n._orig === undefined || n.y === n._orig.y) return;
        let newY = n.y;
        while (newY > n._orig.y) {
          --newY;
          const collide = this.collide(n, {x: n.x, y: newY, w: n.w, h: n.h});
          if (!collide) {
            n._dirty = true;
            n.y = newY;
          }
        }
      });
    } else {
      // top gravity pack
      this.nodes.forEach((n, i) => {
        if (n.locked) return;
        while (n.y > 0) {
          const newY = i === 0 ? 0 : n.y - 1;
          const canBeMoved = i === 0 || !this.collide(n, {x: n.x, y: newY, w: n.w, h: n.h});
          if (!canBeMoved) break;
          // Note: must be dirty (from last position) for GridStack::OnChange CB to update positions
          // and move items back. The user 'change' CB should detect changes from the original
          // starting position instead.
          n._dirty = (n.y !== newY);
          n.y = newY;
        }
      });
    }
    return this;
  }

  /**
   * Prepare and validate a node's coordinates and values for the current grid.