diff --git a/lib/solid/index.jsx b/lib/solid/index.jsx index 029201a2c8..e3c4c0ca3a 100644 --- a/lib/solid/index.jsx +++ b/lib/solid/index.jsx @@ -1085,6 +1085,7 @@ const createResizer = (store, isHorizontal) => { let viewportElement; const sizeKey = isHorizontal ? "width" : "height"; const mountedIndexes = new WeakMap(); + const mountedItems = new Map(); const resizeObserver = createResizeObserver((entries) => { const resizes = []; for (const { target, contentRect } of entries) { @@ -1111,12 +1112,27 @@ const createResizer = (store, isHorizontal) => { }, $observeItem: (el, i) => { mountedIndexes.set(el, i); + mountedItems.set(i, el); resizeObserver._observe(el); return () => { mountedIndexes.delete(el); + if (mountedItems.get(i) === el) { + mountedItems.delete(i); + } resizeObserver._unobserve(el); }; }, + $measureItems: () => { + const resizes = []; + mountedItems.forEach((el, index) => { + if (!el.offsetParent) + return; + resizes.push([index, el.getBoundingClientRect()[sizeKey]]); + }); + if (resizes.length) { + store.$update(ACTION_ITEM_RESIZE, resizes); + } + }, $dispose: resizeObserver._dispose, }; }; @@ -1380,6 +1396,7 @@ const Virtualizer = (props) => { findItemIndex: store.$findItemIndex, getItemOffset: store.$getItemOffset, getItemSize: store.$getItemSize, + measure: resizer.$measureItems, scrollToIndex: scroller.$scrollToIndex, scrollTo: scroller.$scrollTo, scrollBy: scroller.$scrollBy, diff --git a/lib/solid/Virtualizer.d.ts b/lib/solid/Virtualizer.d.ts index 144dd7fba8..819aab92c5 100644 --- a/lib/solid/Virtualizer.d.ts +++ b/lib/solid/Virtualizer.d.ts @@ -38,6 +38,10 @@ export interface VirtualizerHandle { * @param index index of item */ getItemSize(index: number): number; + /** + * Synchronously measure currently mounted items and update cached item sizes. + */ + measure(): void; /** * Scroll to the item specified by index. * @param index index of item