@mui/x-data-grid-pro/hooks/features/multiSelect/gridMultiSelectCache.mjs

The Pro plan edition of the MUI X Data Grid components.

import { fastArrayCompare } from '@mui/x-internals/fastArrayCompare';
/**
 * Holds the grid-level `+N` overflow chip metrics. Written by the single `GridMultiSelectMeasurer`
 * and read by every multiSelect chip cell via `useSyncExternalStore`.
 */
export class GridMultiSelectCache {
  overflowMetrics = null;
  metricsSubscribers = new Set();
  notifyMetrics = metrics => {
    this.metricsSubscribers.forEach(cb => cb(metrics));
  };
  getOverflowMetrics = () => {
    return this.overflowMetrics;
  };
  setOverflowMetrics = next => {
    // Skip no-op updates so subscribed cells don't re-render on every measurer ResizeObserver tick.
    const prev = this.overflowMetrics;
    if (prev && prev.gap === next.gap && fastArrayCompare(prev.overflowChipWidths, next.overflowChipWidths)) {
      return;
    }
    this.overflowMetrics = next;
    this.notifyMetrics(next);
  };
  subscribeOverflowMetrics = callback => {
    this.metricsSubscribers.add(callback);
    return () => {
      this.metricsSubscribers.delete(callback);
    };
  };
  teardown = () => {
    this.metricsSubscribers.clear();
    this.overflowMetrics = null;
  };
}