@tanstack/lit-virtual/dist/esm/index.js

Headless UI for virtualizing scrollable elements in Lit

import { elementScroll, observeElementOffset, observeElementRect, windowScroll, observeWindowOffset, observeWindowRect, Virtualizer } from "@tanstack/virtual-core";
class VirtualizerControllerBase {
  constructor(host, options) {
    this.cleanup = () => {
    };
    const resolvedOptions = {
      ...options,
      onChange: (instance, sync) => {
        var _a;
        this.host.updateComplete.then(() => this.host.requestUpdate());
        (_a = options.onChange) == null ? void 0 : _a.call(options, instance, sync);
      }
    };
    this.virtualizer = new Virtualizer(resolvedOptions);
    (this.host = host).addController(this);
  }
  getVirtualizer() {
    return this.virtualizer;
  }
  hostConnected() {
    this.cleanup = this.virtualizer._didMount();
  }
  hostUpdated() {
    this.virtualizer._willUpdate();
  }
  hostDisconnected() {
    this.cleanup();
  }
}
class VirtualizerController extends VirtualizerControllerBase {
  constructor(host, options) {
    super(host, {
      observeElementRect,
      observeElementOffset,
      scrollToFn: elementScroll,
      ...options
    });
  }
}
class WindowVirtualizerController extends VirtualizerControllerBase {
  constructor(host, options) {
    super(host, {
      getScrollElement: () => typeof document !== "undefined" ? window : null,
      observeElementRect: observeWindowRect,
      observeElementOffset: observeWindowOffset,
      scrollToFn: windowScroll,
      initialOffset: () => typeof document !== "undefined" ? window.scrollY : 0,
      ...options
    });
  }
}
export {
  VirtualizerController,
  WindowVirtualizerController
};
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