{"version":3,"file":"ng-cw-v20-virtual-scroll.mjs","sources":["../../../projects/components/virtual-scroll/virtual-scroll.component.ts","../../../projects/components/virtual-scroll/virtual-scroll.component.html","../../../projects/components/virtual-scroll/virtual-scroll.module.ts","../../../projects/components/virtual-scroll/ng-cw-v20-virtual-scroll.ts"],"sourcesContent":["import { NgTemplateOutlet } from '@angular/common';\nimport {\n AfterViewInit,\n ChangeDetectionStrategy,\n ChangeDetectorRef,\n Component,\n DestroyRef,\n ElementRef,\n NgZone,\n OnChanges,\n Renderer2,\n SimpleChanges,\n TemplateRef,\n inject,\n input,\n signal,\n viewChild,\n} from '@angular/core';\n\ninterface VirtualItem {\n index: number;\n data: T;\n}\n\nfunction ncNumberAttribute(value: unknown, fallback = 0): number {\n if (value === null || value === undefined || value === '') {\n return fallback;\n }\n\n const parsed = Number(value);\n return Number.isNaN(parsed) ? fallback : parsed;\n}\n\n@Component({\n selector: 'nc-virtual-scroll',\n imports: [NgTemplateOutlet],\n templateUrl: './virtual-scroll.component.html',\n styleUrl: './virtual-scroll.component.less',\n changeDetection: ChangeDetectionStrategy.OnPush,\n})\nexport class VirtualScrollComponent implements AfterViewInit, OnChanges {\n private readonly viewport = viewChild.required>('viewport'); // 视窗\n private readonly templateContainer = viewChild>('templateContainer'); // 用于获取传入的item高度，设置itemHeight值\n\n /** 列表数据 */\n ncItems = input([]);\n /** 列表项模板 */\n ncItemTemplate = input | null>(null); // 传入的item模板\n /** 缓冲item数量，前后各2项 */\n ncBufferCount = input(2, { transform: (value: unknown) => ncNumberAttribute(value, 2) });\n\n readonly initialized = signal(false); // 标记 itemHeight 是否已初始化（模板中 @if 使用，需为 public）\n readonly visibleItems = signal>>([]); // 显示items\n readonly totalPadding = signal(0); // 总填充高度\n readonly topPadding = signal(0);\n readonly scrollTop = signal(0); // 已滚动高度\n\n itemHeight = 1; // 若设为0，下方代码获取不到this.templateContainer\n viewportHeight = 0; // 视窗可视高度\n\n private readonly cdr = inject(ChangeDetectorRef);\n private readonly destroyRef = inject(DestroyRef);\n private readonly ngZone = inject(NgZone);\n private readonly renderer = inject(Renderer2);\n\n private viewInitialized = false; // 标记 ngAfterViewInit 是否已执行（templateContainer 才可用）\n private resizeObserver: ResizeObserver | null = null; // 监听 viewport 容器尺寸变化\n private measureTimer: number | null = null;\n\n /**\n * 场景\t触发行\t原因\n * 初始就有值（同步）\t第 49 行measureAndUpdate\tngOnChanges 先执行但 viewInitialized=false 跳过，由 ngAfterViewInit 补调\n * 初始无值，后续赋值（异步）\t第 75 行measureAndUpdate\tngAfterViewInit 时无数据跳过，数据到达时 ngOnChanges 直接调用\n */\n constructor() {\n this.destroyRef.onDestroy(() => this.cleanup());\n }\n\n ngAfterViewInit(): void {\n this.viewportHeight = this.viewport().nativeElement.clientHeight;\n this.viewInitialized = true;\n // 若 ncItems 在 ngAfterViewInit 之前就已同步赋值，则在此补充执行初始化\n if (!this.initialized() && this.ncItems().length > 0) {\n this.measureAndUpdate();\n }\n // 监听 viewport 容器高度变化，在 Angular 区域外观察以避免频繁触发变更检测\n this.ngZone.runOutsideAngular(() => {\n this.resizeObserver = new ResizeObserver(entries => {\n const newHeight = entries[0]?.contentRect.height ?? 0;\n if (newHeight !== this.viewportHeight) {\n this.ngZone.run(() => {\n this.viewportHeight = newHeight;\n this.updateVisibleItems();\n this.cdr.markForCheck();\n });\n }\n });\n this.resizeObserver.observe(this.viewport().nativeElement);\n });\n }\n\n ngOnChanges(changes: SimpleChanges): void {\n if (changes['ncItems']) {\n if (this.ncItems().length === 0) {\n this.clearItemsState();\n return;\n }\n\n if (!this.initialized()) {\n // templateContainer 仅在 ngAfterViewInit 后可用，未初始化则等待\n if (this.viewInitialized) {\n this.measureAndUpdate();\n }\n // 否则由 ngAfterViewInit 补调，无需处理\n } else {\n this.updateTotalPadding();\n this.updateVisibleItems();\n }\n }\n }\n\n onScroll(): void {\n this.ngZone.run(() => {\n this.scrollTop.set(this.viewport().nativeElement.scrollTop);\n this.updateVisibleItems();\n });\n }\n\n updateVisibleItems(): void {\n const items = this.ncItems();\n const firstVisibleIndex = Math.floor(this.scrollTop() / this.itemHeight);\n const startIndex = Math.max(0, firstVisibleIndex - this.ncBufferCount());\n const visibleItemsCount = Math.ceil(this.viewportHeight / this.itemHeight);\n const endIndex = Math.min(firstVisibleIndex + visibleItemsCount + this.ncBufferCount(), items.length - 1);\n\n const nextVisibleItems: Array> = [];\n for (let i = startIndex; i <= endIndex; i++) {\n nextVisibleItems.push({ index: i, data: items[i] });\n }\n\n this.visibleItems.set(nextVisibleItems);\n this.topPadding.set(startIndex * this.itemHeight);\n }\n\n updateTotalPadding(): void {\n this.totalPadding.set(this.ncItems().length * this.itemHeight);\n }\n\n private clearItemsState(): void {\n this.clearMeasureTimer();\n this.visibleItems.set([]);\n this.totalPadding.set(0);\n this.topPadding.set(0);\n this.scrollTop.set(0);\n if (this.viewInitialized) {\n this.viewport().nativeElement.scrollTop = 0;\n }\n this.cdr.markForCheck();\n }\n\n // 采用track提升性能，只渲染改变的dom\n trackByIndex(item: VirtualItem): number {\n return item.index;\n }\n\n /** 测量 itemHeight 并更新列表（需在 ngAfterViewInit 之后调用） */\n private measureAndUpdate(): void {\n this.clearMeasureTimer();\n // setTimeout(0) 确保 Angular 已完成本次 DOM 渲染\n this.measureTimer = window.setTimeout(() => {\n this.measureTimer = null;\n const element = this.templateContainer()?.nativeElement.firstElementChild as HTMLElement | null;\n if (element) {\n const styles = getComputedStyle(element);\n this.itemHeight = element.offsetHeight + parseFloat(styles.marginTop) + parseFloat(styles.marginBottom);\n this.initialized.set(true);\n }\n this.updateTotalPadding();\n this.updateVisibleItems();\n this.cdr.markForCheck();\n });\n }\n\n private cleanup(): void {\n this.clearMeasureTimer();\n this.resizeObserver?.disconnect();\n this.resizeObserver = null;\n }\n\n private clearMeasureTimer(): void {\n if (this.measureTimer !== null) {\n window.clearTimeout(this.measureTimer);\n this.measureTimer = null;\n }\n }\n}\n","\n@if (!initialized() && ncItems().length > 0) {\n
\n \n
\n}\n\n
\n
\n
\n @for (item of visibleItems(); track trackByIndex(item)) {\n
\n \n
\n }\n
\n
\n
\n","import { NgModule } from '@angular/core';\r\nimport { CommonModule } from '@angular/common';\r\nimport { VirtualScrollComponent } from './virtual-scroll.component';\r\n\r\n@NgModule({\r\n imports: [\r\n VirtualScrollComponent,\r\n CommonModule\r\n ],\r\n exports: [\r\n VirtualScrollComponent\r\n ]\r\n})\r\nexport class NcVirtualScrollModule { }","/**\n * Generated bundle index. 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