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All rights reserved.\n * This file is licensed to you under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License. You may obtain a copy\n * of the License at http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software distributed under\n * the License is distributed on an \"AS IS\" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS\n * OF ANY KIND, either express or implied. See the License for the specific language\n * governing permissions and limitations under the License.\n */\n\nimport {Collection, Key} from '@react-types/shared';\nimport {InvalidationContext} from './types';\nimport {Layout} from './Layout';\nimport React, {useCallback, useMemo, useRef, useState} from 'react';\nimport {Rect} from './Rect';\nimport {ReusableView} from './ReusableView';\nimport {Size} from './Size';\nimport {Virtualizer} from './Virtualizer';\n\n// During SSR, React emits a warning when calling useLayoutEffect.\n// Since neither useLayoutEffect nor useEffect run on the server,\n// we can suppress this by replace it with a noop on the server.\nexport const useLayoutEffect: typeof React.useLayoutEffect = typeof document !== 'undefined'\n ? React.useLayoutEffect\n : () => {};\n\ninterface VirtualizerProps<T extends object, V, O> {\n renderView(type: string, content: T | null): V,\n layout: Layout<T>,\n collection: Collection<T>,\n onVisibleRectChange(rect: Rect): void,\n persistedKeys?: Set<Key> | null,\n layoutOptions?: O,\n allowsWindowScrolling?: boolean\n}\n\nexport interface VirtualizerState<T extends object, V> {\n visibleViews: ReusableView<T, V>[],\n setVisibleRect: (rect: Rect) => void,\n size: Size,\n setSize: (size: Size) => void,\n contentSize: Size,\n virtualizer: Virtualizer<T, V>,\n isScrolling: boolean,\n startScrolling: () => void,\n endScrolling: () => void\n}\n\nexport function useVirtualizerState<T extends object, V, O = any>(opts: VirtualizerProps<T, V, O>): VirtualizerState<T, V> {\n let [visibleRect, setVisibleRect] = useState(new Rect(0, 0, 0, 0));\n let [size, setSize] = useState(new Size());\n let [isScrolling, setScrolling] = useState(false);\n let [invalidationContext, setInvalidationContext] = useState<InvalidationContext>({});\n let visibleRectChanged = useRef(false);\n let [virtualizer] = useState(() => new Virtualizer<T, V>({\n collection: opts.collection,\n layout: opts.layout,\n delegate: {\n setVisibleRect(rect) {\n setVisibleRect(rect);\n visibleRectChanged.current = true;\n },\n // TODO: should changing these invalidate the entire cache?\n renderView: opts.renderView,\n invalidate: setInvalidationContext\n }\n }));\n\n // onVisibleRectChange must be called from an effect, not during render.\n useLayoutEffect(() => {\n if (visibleRectChanged.current) {\n visibleRectChanged.current = false;\n opts.onVisibleRectChange(visibleRect);\n }\n });\n\n let mergedInvalidationContext = useMemo(() => {\n if (opts.layoutOptions != null) {\n return {...invalidationContext, layoutOptions: opts.layoutOptions};\n }\n return invalidationContext;\n }, [invalidationContext, opts.layoutOptions]);\n\n let visibleViews = virtualizer.render({\n layout: opts.layout,\n collection: opts.collection,\n persistedKeys: opts.persistedKeys,\n layoutOptions: opts.layoutOptions,\n visibleRect,\n size: opts.allowsWindowScrolling ? size : visibleRect,\n invalidationContext: mergedInvalidationContext,\n isScrolling\n });\n\n let contentSize = virtualizer.contentSize;\n\n let startScrolling = useCallback(() => {\n setScrolling(true);\n }, []);\n let endScrolling = useCallback(() => {\n setScrolling(false);\n }, []);\n\n let state = useMemo(() => ({\n virtualizer,\n visibleViews,\n setVisibleRect,\n size,\n setSize,\n contentSize,\n isScrolling,\n startScrolling,\n endScrolling\n }), [\n virtualizer,\n visibleViews,\n setVisibleRect,\n size,\n setSize,\n contentSize,\n isScrolling,\n startScrolling,\n endScrolling\n ]);\n\n return state;\n}\n"],"names":[],"version":3,"file":"useVirtualizerState.cjs.map"} |