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* Copyright 2020 Adobe. 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 {ChildView, ReusableView, RootView} from './ReusableView';\nimport {Collection, Key} from '@react-types/shared';\nimport {InvalidationContext, Mutable, VirtualizerDelegate, VirtualizerRenderOptions} from './types';\nimport {isSetEqual} from './utils';\nimport {Layout} from './Layout';\nimport {LayoutInfo} from './LayoutInfo';\nimport {OverscanManager} from './OverscanManager';\nimport {Point} from './Point';\nimport {Rect} from './Rect';\nimport {Size} from './Size';\n\ninterface VirtualizerOptions<T extends object, V> {\n delegate: VirtualizerDelegate<T, V>,\n collection: Collection<T>,\n layout: Layout<T>\n}\n\n/**\n * The Virtualizer class renders a scrollable collection of data using customizable layouts.\n * It supports very large collections by only rendering visible views to the DOM, reusing\n * them as you scroll. Virtualizer can present any type of view, including non-item views\n * such as section headers and footers.\n *\n * Virtualizer uses `Layout` objects to compute what views should be visible, and how\n * to position and style them. This means that virtualizer can have its items arranged in\n * a stack, a grid, a circle, or any other layout you can think of. The layout can be changed\n * dynamically at runtime as well.\n *\n * Layouts produce information on what views should appear in the virtualizer, but do not create\n * the views themselves directly. It is the responsibility of the `VirtualizerDelegate` object\n * to render elements for each layout info. The virtualizer manages a set of `ReusableView` objects,\n * which are reused as the user scrolls by swapping their content with cached elements returned by the delegate.\n */\nexport class Virtualizer<T extends object, V> {\n /**\n * The virtualizer delegate. The delegate is used by the virtualizer\n * to create and configure views.\n */\n delegate: VirtualizerDelegate<T, V>;\n\n /** The current content of the virtualizer. */\n readonly collection: Collection<T>;\n /** The layout object that determines the visible views. */\n readonly layout: Layout<T>;\n /** The size of the scrollable content. */\n readonly contentSize: Size;\n /** The currently visible rectangle. */\n readonly visibleRect: Rect;\n /** The size of the virtualizer scroll view. */\n readonly size: Size;\n /** The set of persisted keys that are always present in the DOM, even if not currently in view. */\n readonly persistedKeys: Set<Key>;\n\n private _visibleViews: Map<Key, ChildView<T, V>>;\n private _renderedContent: WeakMap<T, V>;\n private _rootView: RootView<T, V>;\n private _isScrolling: boolean;\n private _invalidationContext: InvalidationContext;\n private _overscanManager: OverscanManager;\n\n constructor(options: VirtualizerOptions<T, V>) {\n this.delegate = options.delegate;\n this.collection = options.collection;\n this.layout = options.layout;\n this.contentSize = new Size;\n this.visibleRect = new Rect;\n this.size = new Size;\n this.persistedKeys = new Set();\n this._visibleViews = new Map();\n this._renderedContent = new WeakMap();\n this._rootView = new RootView(this);\n this._isScrolling = false;\n this._invalidationContext = {};\n this._overscanManager = new OverscanManager();\n }\n\n /** Returns whether the given key, or an ancestor, is persisted. */\n isPersistedKey(key: Key): boolean {\n // Quick check if the key is directly in the set of persisted keys.\n if (this.persistedKeys.has(key)) {\n return true;\n }\n\n // If not, check if the key is an ancestor of any of the persisted keys.\n for (let k of this.persistedKeys) {\n while (k != null) {\n let layoutInfo = this.layout.getLayoutInfo(k);\n if (!layoutInfo || layoutInfo.parentKey == null) {\n break;\n }\n\n k = layoutInfo.parentKey;\n\n if (k === key) {\n return true;\n }\n }\n }\n\n return false;\n }\n\n private getParentView(layoutInfo: LayoutInfo): ReusableView<T, V> | undefined {\n return layoutInfo.parentKey != null ? this._visibleViews.get(layoutInfo.parentKey) : this._rootView;\n }\n\n private getReusableView(layoutInfo: LayoutInfo): ChildView<T, V> {\n let parentView = this.getParentView(layoutInfo)!;\n let view = parentView.getReusableView(layoutInfo.type);\n view.layoutInfo = layoutInfo;\n this._renderView(view);\n return view;\n }\n\n private _renderView(reusableView: ReusableView<T, V>) {\n if (reusableView.layoutInfo) {\n let {type, key, content} = reusableView.layoutInfo;\n reusableView.content = content || this.collection.getItem(key);\n reusableView.rendered = this._renderContent(type, reusableView.content);\n }\n }\n\n private _renderContent(type: string, content: T | null) {\n let cached = content != null ? this._renderedContent.get(content) : null;\n if (cached != null) {\n return cached;\n }\n\n let rendered = this.delegate.renderView(type, content);\n if (content) {\n this._renderedContent.set(content, rendered);\n }\n return rendered;\n }\n\n /**\n * Returns the key for the item view currently at the given point.\n */\n keyAtPoint(point: Point): Key | null {\n let rect = new Rect(point.x, point.y, 1, 1);\n let layoutInfos = rect.area === 0 ? [] : this.layout.getVisibleLayoutInfos(rect);\n\n // Layout may return multiple layout infos in the case of\n // persisted keys, so find the first one that actually intersects.\n for (let layoutInfo of layoutInfos) {\n if (layoutInfo.rect.intersects(rect)) {\n return layoutInfo.key;\n }\n }\n\n return null;\n }\n\n private relayout(context: InvalidationContext = {}) {\n // Update the layout\n this.layout.update(context);\n (this as Mutable<this>).contentSize = this.layout.getContentSize();\n\n // Constrain scroll position.\n // If the content changed, scroll to the top.\n let visibleRect = this.visibleRect;\n let contentOffsetX = context.contentChanged ? 0 : visibleRect.x;\n let contentOffsetY = context.contentChanged ? 0 : visibleRect.y;\n contentOffsetX = Math.max(0, Math.min(this.contentSize.width - visibleRect.width, contentOffsetX));\n contentOffsetY = Math.max(0, Math.min(this.contentSize.height - visibleRect.height, contentOffsetY));\n\n if (contentOffsetX !== visibleRect.x || contentOffsetY !== visibleRect.y) {\n // If the offset changed, trigger a new re-render.\n let rect = new Rect(contentOffsetX, contentOffsetY, visibleRect.width, visibleRect.height);\n this.delegate.setVisibleRect(rect);\n } else {\n this.updateSubviews();\n }\n }\n\n getVisibleLayoutInfos(): Map<Key, LayoutInfo> {\n let isTestEnv = process.env.NODE_ENV === 'test' && !process.env.VIRT_ON;\n let isClientWidthMocked = isTestEnv && typeof HTMLElement !== 'undefined' && Object.getOwnPropertyNames(HTMLElement.prototype).includes('clientWidth');\n let isClientHeightMocked = isTestEnv && typeof HTMLElement !== 'undefined' && Object.getOwnPropertyNames(HTMLElement.prototype).includes('clientHeight');\n\n let rect: Rect;\n if (isTestEnv && !(isClientWidthMocked && isClientHeightMocked)) {\n rect = new Rect(0, 0, this.contentSize.width, this.contentSize.height);\n } else {\n rect = this._overscanManager.getOverscannedRect();\n }\n let layoutInfos = this.layout.getVisibleLayoutInfos(rect);\n let map = new Map;\n for (let layoutInfo of layoutInfos) {\n map.set(layoutInfo.key, layoutInfo);\n }\n\n return map;\n }\n\n private updateSubviews() {\n let visibleLayoutInfos = this.getVisibleLayoutInfos();\n\n let removed = new Set<ChildView<T, V>>();\n for (let [key, view] of this._visibleViews) {\n let layoutInfo = visibleLayoutInfos.get(key);\n // If a view's parent changed, treat it as a delete and re-create in the new parent.\n if (!layoutInfo || view.parent !== this.getParentView(layoutInfo)) {\n this._visibleViews.delete(key);\n view.parent.reuseChild(view);\n removed.add(view); // Defer removing in case we reuse this view.\n }\n }\n\n for (let [key, layoutInfo] of visibleLayoutInfos) {\n let view = this._visibleViews.get(key);\n if (!view) {\n view = this.getReusableView(layoutInfo);\n view.parent.children.add(view);\n this._visibleViews.set(key, view);\n removed.delete(view);\n } else {\n view.layoutInfo = layoutInfo;\n\n let item = this.collection.getItem(layoutInfo.key);\n if (view.content !== item) {\n if (view.content != null) {\n this._renderedContent.delete(view.content);\n }\n this._renderView(view);\n }\n }\n }\n\n // The remaining views in `removed` were not reused to render new items.\n // They should be removed from the DOM. We also clear the reusable view queue\n // here since there's no point holding onto views that have been removed.\n // Doing so hurts performance in the future when reusing elements due to FIFO order.\n for (let view of removed) {\n view.parent.children.delete(view);\n view.parent.reusableViews.clear();\n }\n\n // Reordering DOM nodes is costly, so we defer this until scrolling stops.\n // DOM order does not affect visual order (due to absolute positioning),\n // but does matter for assistive technology users.\n if (!this._isScrolling) {\n // Layout infos must be in topological order (parents before children).\n for (let key of visibleLayoutInfos.keys()) {\n let view = this._visibleViews.get(key)!;\n view.parent.children.delete(view);\n view.parent.children.add(view);\n }\n }\n }\n\n /** Performs layout and updates visible views as needed. */\n render(opts: VirtualizerRenderOptions<T>): ReusableView<T, V>[] {\n let mutableThis: Mutable<this> = this;\n let needsLayout = false;\n let offsetChanged = false;\n let sizeChanged = false;\n let itemSizeChanged = false;\n let layoutOptionsChanged = false;\n let needsUpdate = false;\n\n if (opts.collection !== this.collection) {\n mutableThis.collection = opts.collection;\n needsLayout = true;\n }\n\n if (opts.layout !== this.layout || this.layout.virtualizer !== this) {\n if (this.layout) {\n this.layout.virtualizer = null;\n }\n\n opts.layout.virtualizer = this;\n mutableThis.layout = opts.layout;\n needsLayout = true;\n }\n\n if (opts.persistedKeys && !isSetEqual(opts.persistedKeys, this.persistedKeys)) {\n mutableThis.persistedKeys = opts.persistedKeys;\n needsUpdate = true;\n }\n\n if (!this.visibleRect.equals(opts.visibleRect) || !this.size.equals(opts.size)) {\n this._overscanManager.setVisibleRect(opts.visibleRect);\n\n // Create a rectangle using the scroll position and layout size of the scroll view. This is not the same\n // as the visibleRect, whose width and height may change during window scrolling.\n let oldRect = new Rect(this.visibleRect.x, this.visibleRect.y, this.size.width, this.size.height);\n let newRect = new Rect(opts.visibleRect.x, opts.visibleRect.y, opts.size.width, opts.size.height);\n let shouldInvalidate = this.layout.shouldInvalidate(newRect, oldRect);\n\n if (shouldInvalidate) {\n offsetChanged = !opts.visibleRect.pointEquals(this.visibleRect);\n sizeChanged = !this.size.equals(opts.size);\n needsLayout = true;\n } else {\n needsUpdate = true;\n }\n\n mutableThis.visibleRect = opts.visibleRect;\n mutableThis.size = opts.size;\n }\n\n if (opts.invalidationContext !== this._invalidationContext) {\n if (opts.invalidationContext) {\n sizeChanged ||= opts.invalidationContext.sizeChanged || false;\n offsetChanged ||= opts.invalidationContext.offsetChanged || false;\n itemSizeChanged ||= opts.invalidationContext.itemSizeChanged || false;\n layoutOptionsChanged ||= opts.invalidationContext.layoutOptions != null\n && this._invalidationContext.layoutOptions != null\n && opts.invalidationContext.layoutOptions !== this._invalidationContext.layoutOptions\n && this.layout.shouldInvalidateLayoutOptions(opts.invalidationContext.layoutOptions, this._invalidationContext.layoutOptions);\n needsLayout ||= itemSizeChanged || sizeChanged || offsetChanged || layoutOptionsChanged;\n }\n this._invalidationContext = opts.invalidationContext;\n }\n\n if (opts.isScrolling !== this._isScrolling) {\n this._isScrolling = opts.isScrolling;\n if (!opts.isScrolling) {\n // Update to fix the DOM order after scrolling.\n needsUpdate = true;\n }\n }\n\n if (needsLayout) {\n this.relayout({\n offsetChanged,\n sizeChanged,\n itemSizeChanged,\n layoutOptionsChanged,\n layoutOptions: this._invalidationContext.layoutOptions\n });\n } else if (needsUpdate) {\n this.updateSubviews();\n }\n\n return Array.from(this._rootView.children);\n }\n\n getVisibleView(key: Key): ReusableView<T, V> | undefined {\n return this._visibleViews.get(key);\n }\n\n invalidate(context: InvalidationContext): void {\n this.delegate.invalidate(context);\n }\n\n updateItemSize(key: Key, size: Size): void {\n if (!this.layout.updateItemSize) {\n return;\n }\n\n let changed = this.layout.updateItemSize(key, size);\n if (changed) {\n this.invalidate({\n itemSizeChanged: true\n });\n }\n }\n}\n"],"names":[],"version":3,"file":"Virtualizer.mjs.map"} |