Method update

packages/@react-spectrum/ai/src/ListLayout.ts:408–452

(invalidationContext: InvalidationContext<O>)

  }

  update(invalidationContext: InvalidationContext<O>): void {
    let collection = this.virtualizer!.collection;

    // Reset valid rect if we will have to invalidate everything.
    // Otherwise we can reuse cached layout infos outside the current visible rect.
    this.invalidateEverything = this.shouldInvalidateEverything(invalidationContext);
    if (this.invalidateEverything) {
      this.requestedRect = this.virtualizer!.visibleRect.copy();
      this.layoutNodes.clear();
    }

    let options = invalidationContext.layoutOptions;
    this.rowSize = options?.rowSize ?? options?.rowHeight ?? this.rowSize;
    this.orientation = options?.orientation ?? this.orientation;
    this.anchorTo = options?.anchorTo ?? this.anchorTo;
    this.scrollEndThreshold = options?.scrollEndThreshold ?? this.scrollEndThreshold;
    this.estimatedRowSize =
      options?.estimatedRowSize ?? options?.estimatedRowHeight ?? this.estimatedRowSize;
    this.headingSize = options?.headingSize ?? options?.headingHeight ?? this.headingSize;
    this.estimatedHeadingSize =
      options?.estimatedHeadingSize ?? options?.estimatedHeadingHeight ?? this.estimatedHeadingSize;
    this.loaderSize = options?.loaderSize ?? options?.loaderHeight ?? this.loaderSize;
    this.dropIndicatorThickness = options?.dropIndicatorThickness ?? this.dropIndicatorThickness;
    this.gap = options?.gap ?? this.gap;
    this.padding = options?.padding ?? this.padding;
    this.warnIfReversedHorizontal();

    this.rootNodes = this.buildCollection();

    // Remove deleted layout nodes
    if (this.lastCollection && collection !== this.lastCollection) {
      for (let key of this.lastCollection.getKeys()) {
        if (!collection.getItem(key)) {
          let layoutNode = this.layoutNodes.get(key);
          if (layoutNode) {
            this.layoutNodes.delete(key);
          }
        }
      }
    }

    this.lastCollection = collection;
    this.invalidateEverything = false;
    this.validRect = this.requestedRect.copy();
  }

  protected buildCollection(offset: number = this.padding): LayoutNode[] {
    if (this.anchorTo === 'end' && this.orientation === 'vertical') {