/** * @license * Copyright Google LLC All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ import { coerceNumberProperty } from '@angular/cdk/coercion'; import { Directive, forwardRef, Input } from '@angular/core'; import { Subject } from 'rxjs'; import { distinctUntilChanged } from 'rxjs/operators'; import { VIRTUAL_SCROLL_STRATEGY } from './virtual-scroll-strategy'; /** Virtual scrolling strategy for lists with items of known fixed size. */ export class FixedSizeVirtualScrollStrategy { /** * @param itemSize The size of the items in the virtually scrolling list. * @param minBufferPx The minimum amount of buffer (in pixels) before needing to render more * @param maxBufferPx The amount of buffer (in pixels) to render when rendering more. */ constructor(itemSize, minBufferPx, maxBufferPx) { this._scrolledIndexChange = new Subject(); /** @docs-private Implemented as part of VirtualScrollStrategy. */ this.scrolledIndexChange = this._scrolledIndexChange.pipe(distinctUntilChanged()); /** The attached viewport. */ this._viewport = null; this._itemSize = itemSize; this._minBufferPx = minBufferPx; this._maxBufferPx = maxBufferPx; } /** * Attaches this scroll strategy to a viewport. * @param viewport The viewport to attach this strategy to. */ attach(viewport) { this._viewport = viewport; this._updateTotalContentSize(); this._updateRenderedRange(); } /** Detaches this scroll strategy from the currently attached viewport. */ detach() { this._scrolledIndexChange.complete(); this._viewport = null; } /** * Update the item size and buffer size. * @param itemSize The size of the items in the virtually scrolling list. * @param minBufferPx The minimum amount of buffer (in pixels) before needing to render more * @param maxBufferPx The amount of buffer (in pixels) to render when rendering more. */ updateItemAndBufferSize(itemSize, minBufferPx, maxBufferPx) { if (maxBufferPx < minBufferPx && (typeof ngDevMode === 'undefined' || ngDevMode)) { throw Error('CDK virtual scroll: maxBufferPx must be greater than or equal to minBufferPx'); } this._itemSize = itemSize; this._minBufferPx = minBufferPx; this._maxBufferPx = maxBufferPx; this._updateTotalContentSize(); this._updateRenderedRange(); } /** @docs-private Implemented as part of VirtualScrollStrategy. */ onContentScrolled() { this._updateRenderedRange(); } /** @docs-private Implemented as part of VirtualScrollStrategy. */ onDataLengthChanged() { this._updateTotalContentSize(); this._updateRenderedRange(); } /** @docs-private Implemented as part of VirtualScrollStrategy. */ onContentRendered() { } /** @docs-private Implemented as part of VirtualScrollStrategy. */ onRenderedOffsetChanged() { } /** * Scroll to the offset for the given index. * @param index The index of the element to scroll to. * @param behavior The ScrollBehavior to use when scrolling. */ scrollToIndex(index, behavior) { if (this._viewport) { this._viewport.scrollToOffset(index * this._itemSize, behavior); } } /** Update the viewport's total content size. */ _updateTotalContentSize() { if (!this._viewport) { return; } this._viewport.setTotalContentSize(this._viewport.getDataLength() * this._itemSize); } /** Update the viewport's rendered range. */ _updateRenderedRange() { if (!this._viewport) { return; } const renderedRange = this._viewport.getRenderedRange(); const newRange = { start: renderedRange.start, end: renderedRange.end }; const viewportSize = this._viewport.getViewportSize(); const dataLength = this._viewport.getDataLength(); let scrollOffset = this._viewport.measureScrollOffset(); // Prevent NaN as result when dividing by zero. let firstVisibleIndex = (this._itemSize > 0) ? scrollOffset / this._itemSize : 0; // If user scrolls to the bottom of the list and data changes to a smaller list if (newRange.end > dataLength) { // We have to recalculate the first visible index based on new data length and viewport size. const maxVisibleItems = Math.ceil(viewportSize / this._itemSize); const newVisibleIndex = Math.max(0, Math.min(firstVisibleIndex, dataLength - maxVisibleItems)); // If first visible index changed we must update scroll offset to handle start/end buffers // Current range must also be adjusted to cover the new position (bottom of new list). if (firstVisibleIndex != newVisibleIndex) { firstVisibleIndex = newVisibleIndex; scrollOffset = newVisibleIndex * this._itemSize; newRange.start = Math.floor(firstVisibleIndex); } newRange.end = Math.max(0, Math.min(dataLength, newRange.start + maxVisibleItems)); } const startBuffer = scrollOffset - newRange.start * this._itemSize; if (startBuffer < this._minBufferPx && newRange.start != 0) { const expandStart = Math.ceil((this._maxBufferPx - startBuffer) / this._itemSize); newRange.start = Math.max(0, newRange.start - expandStart); newRange.end = Math.min(dataLength, Math.ceil(firstVisibleIndex + (viewportSize + this._minBufferPx) / this._itemSize)); } else { const endBuffer = newRange.end * this._itemSize - (scrollOffset + viewportSize); if (endBuffer < this._minBufferPx && newRange.end != dataLength) { const expandEnd = Math.ceil((this._maxBufferPx - endBuffer) / this._itemSize); if (expandEnd > 0) { newRange.end = Math.min(dataLength, newRange.end + expandEnd); newRange.start = Math.max(0, Math.floor(firstVisibleIndex - this._minBufferPx / this._itemSize)); } } } this._viewport.setRenderedRange(newRange); this._viewport.setRenderedContentOffset(this._itemSize * newRange.start); this._scrolledIndexChange.next(Math.floor(firstVisibleIndex)); } } /** * Provider factory for `FixedSizeVirtualScrollStrategy` that simply extracts the already created * `FixedSizeVirtualScrollStrategy` from the given directive. * @param fixedSizeDir The instance of `CdkFixedSizeVirtualScroll` to extract the * `FixedSizeVirtualScrollStrategy` from. */ export function _fixedSizeVirtualScrollStrategyFactory(fixedSizeDir) { return fixedSizeDir._scrollStrategy; } /** A virtual scroll strategy that supports fixed-size items. */ export class CdkFixedSizeVirtualScroll { constructor() { this._itemSize = 20; this._minBufferPx = 100; this._maxBufferPx = 200; /** The scroll strategy used by this directive. */ this._scrollStrategy = new FixedSizeVirtualScrollStrategy(this.itemSize, this.minBufferPx, this.maxBufferPx); } /** The size of the items in the list (in pixels). */ get itemSize() { return this._itemSize; } set itemSize(value) { this._itemSize = coerceNumberProperty(value); } /** * The minimum amount of buffer rendered beyond the viewport (in pixels). * If the amount of buffer dips below this number, more items will be rendered. Defaults to 100px. */ get minBufferPx() { return this._minBufferPx; } set minBufferPx(value) { this._minBufferPx = coerceNumberProperty(value); } /** * The number of pixels worth of buffer to render for when rendering new items. Defaults to 200px. */ get maxBufferPx() { return this._maxBufferPx; } set maxBufferPx(value) { this._maxBufferPx = coerceNumberProperty(value); } ngOnChanges() { this._scrollStrategy.updateItemAndBufferSize(this.itemSize, this.minBufferPx, this.maxBufferPx); } } CdkFixedSizeVirtualScroll.decorators = [ { type: Directive, args: [{ selector: 'cdk-virtual-scroll-viewport[itemSize]', providers: [{ provide: VIRTUAL_SCROLL_STRATEGY, useFactory: _fixedSizeVirtualScrollStrategyFactory, deps: [forwardRef(() => CdkFixedSizeVirtualScroll)], }], },] } ]; CdkFixedSizeVirtualScroll.propDecorators = { itemSize: [{ type: Input }], minBufferPx: [{ type: Input }], maxBufferPx: [{ type: Input }] }; //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {\n  coerceNumberProperty,\n  NumberInput\n} from '@angular/cdk/coercion';\nimport {Directive, forwardRef, Input, OnChanges} from '@angular/core';\nimport {Observable, Subject} from 'rxjs';\nimport {distinctUntilChanged} from 'rxjs/operators';\nimport {VIRTUAL_SCROLL_STRATEGY, VirtualScrollStrategy} from './virtual-scroll-strategy';\nimport {CdkVirtualScrollViewport} from './virtual-scroll-viewport';\n\n\n/** Virtual scrolling strategy for lists with items of known fixed size. */\nexport class FixedSizeVirtualScrollStrategy implements VirtualScrollStrategy {\n  private readonly _scrolledIndexChange = new Subject<number>();\n\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  scrolledIndexChange: Observable<number> = this._scrolledIndexChange.pipe(distinctUntilChanged());\n\n  /** The attached viewport. */\n  private _viewport: CdkVirtualScrollViewport | null = null;\n\n  /** The size of the items in the virtually scrolling list. */\n  private _itemSize: number;\n\n  /** The minimum amount of buffer rendered beyond the viewport (in pixels). */\n  private _minBufferPx: number;\n\n  /** The number of buffer items to render beyond the edge of the viewport (in pixels). */\n  private _maxBufferPx: number;\n\n  /**\n   * @param itemSize The size of the items in the virtually scrolling list.\n   * @param minBufferPx The minimum amount of buffer (in pixels) before needing to render more\n   * @param maxBufferPx The amount of buffer (in pixels) to render when rendering more.\n   */\n  constructor(itemSize: number, minBufferPx: number, maxBufferPx: number) {\n    this._itemSize = itemSize;\n    this._minBufferPx = minBufferPx;\n    this._maxBufferPx = maxBufferPx;\n  }\n\n  /**\n   * Attaches this scroll 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equal to minBufferPx');\n    }\n    this._itemSize = itemSize;\n    this._minBufferPx = minBufferPx;\n    this._maxBufferPx = maxBufferPx;\n    this._updateTotalContentSize();\n    this._updateRenderedRange();\n  }\n\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onContentScrolled() {\n    this._updateRenderedRange();\n  }\n\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onDataLengthChanged() {\n    this._updateTotalContentSize();\n    this._updateRenderedRange();\n  }\n\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onContentRendered() { /* no-op */ }\n\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onRenderedOffsetChanged() { /* no-op */ }\n\n  /**\n   * Scroll to the offset for the given index.\n   * @param index The index of the element to scroll to.\n   * @param behavior The ScrollBehavior to use when scrolling.\n   */\n  scrollToIndex(index: number, behavior: ScrollBehavior): void {\n    if (this._viewport) {\n      this._viewport.scrollToOffset(index * this._itemSize, behavior);\n    }\n  }\n\n  /** Update the viewport's total content size. */\n  private _updateTotalContentSize() {\n    if (!this._viewport) {\n      return;\n    }\n\n    this._viewport.setTotalContentSize(this._viewport.getDataLength() * this._itemSize);\n  }\n\n  /** Update the viewport's rendered range. */\n  private _updateRenderedRange() {\n    if (!this._viewport) {\n      return;\n    }\n\n    const renderedRange = this._viewport.getRenderedRange();\n    const newRange = {start: renderedRange.start, end: renderedRange.end};\n    const viewportSize = this._viewport.getViewportSize();\n    const dataLength = this._viewport.getDataLength();\n    let scrollOffset = this._viewport.measureScrollOffset();\n     // Prevent NaN as result when dividing by zero.\n    let firstVisibleIndex = (this._itemSize > 0) ? scrollOffset / this._itemSize : 0;\n\n    // If user scrolls to the bottom of the list and data changes to a smaller list\n    if (newRange.end > dataLength) {\n      // We have to recalculate the first visible index based on new data length and viewport size.\n      const maxVisibleItems = Math.ceil(viewportSize / this._itemSize);\n      const newVisibleIndex = Math.max(0,\n          Math.min(firstVisibleIndex, dataLength - maxVisibleItems));\n\n      // If first visible index changed we must update scroll offset to handle start/end buffers\n      // Current range must also be adjusted to cover the new position (bottom of new list).\n      if (firstVisibleIndex != newVisibleIndex) {\n        firstVisibleIndex = newVisibleIndex;\n        scrollOffset = newVisibleIndex * this._itemSize;\n        newRange.start = Math.floor(firstVisibleIndex);\n      }\n\n      newRange.end = Math.max(0, Math.min(dataLength, newRange.start + maxVisibleItems));\n    }\n\n    const startBuffer = scrollOffset - newRange.start * this._itemSize;\n    if (startBuffer < this._minBufferPx && newRange.start != 0) {\n      const expandStart = Math.ceil((this._maxBufferPx - startBuffer) / this._itemSize);\n      newRange.start = Math.max(0, newRange.start - expandStart);\n      newRange.end = Math.min(dataLength,\n          Math.ceil(firstVisibleIndex + (viewportSize + this._minBufferPx) / this._itemSize));\n    } else {\n      const endBuffer = newRange.end * this._itemSize - (scrollOffset + viewportSize);\n      if (endBuffer < this._minBufferPx && newRange.end != dataLength) {\n        const expandEnd = Math.ceil((this._maxBufferPx - endBuffer) / this._itemSize);\n        if (expandEnd > 0) {\n          newRange.end = Math.min(dataLength, newRange.end + expandEnd);\n          newRange.start = Math.max(0,\n              Math.floor(firstVisibleIndex - this._minBufferPx / this._itemSize));\n        }\n      }\n    }\n\n    this._viewport.setRenderedRange(newRange);\n    this._viewport.setRenderedContentOffset(this._itemSize * newRange.start);\n    this._scrolledIndexChange.next(Math.floor(firstVisibleIndex));\n  }\n}\n\n\n/**\n * Provider factory for `FixedSizeVirtualScrollStrategy` that simply extracts the already created\n * `FixedSizeVirtualScrollStrategy` from the given directive.\n * @param fixedSizeDir The instance of `CdkFixedSizeVirtualScroll` to extract the\n *     `FixedSizeVirtualScrollStrategy` from.\n */\nexport function _fixedSizeVirtualScrollStrategyFactory(fixedSizeDir: CdkFixedSizeVirtualScroll) {\n  return fixedSizeDir._scrollStrategy;\n}\n\n\n/** A virtual scroll strategy that supports fixed-size items. */\n@Directive({\n  selector: 'cdk-virtual-scroll-viewport[itemSize]',\n  providers: [{\n    provide: VIRTUAL_SCROLL_STRATEGY,\n    useFactory: _fixedSizeVirtualScrollStrategyFactory,\n    deps: [forwardRef(() => CdkFixedSizeVirtualScroll)],\n  }],\n})\nexport class CdkFixedSizeVirtualScroll implements OnChanges {\n  /** The size of the items in the list (in pixels). */\n  @Input()\n  get itemSize(): number { return this._itemSize; }\n  set itemSize(value: number) { this._itemSize = coerceNumberProperty(value); }\n  _itemSize = 20;\n\n  /**\n   * The minimum amount of buffer rendered beyond the viewport (in pixels).\n   * If the amount of buffer dips below this number, more items will be rendered. Defaults to 100px.\n   */\n  @Input()\n  get minBufferPx(): number { return this._minBufferPx; }\n  set minBufferPx(value: number) { this._minBufferPx = coerceNumberProperty(value); }\n  _minBufferPx = 100;\n\n  /**\n   * The number of pixels worth of buffer to render for when rendering new items. Defaults to 200px.\n   */\n  @Input()\n  get maxBufferPx(): number { return this._maxBufferPx; }\n  set maxBufferPx(value: number) { this._maxBufferPx = coerceNumberProperty(value); }\n  _maxBufferPx = 200;\n\n  /** The scroll strategy used by this directive. */\n  _scrollStrategy =\n      new FixedSizeVirtualScrollStrategy(this.itemSize, this.minBufferPx, this.maxBufferPx);\n\n  ngOnChanges() {\n    this._scrollStrategy.updateItemAndBufferSize(this.itemSize, this.minBufferPx, this.maxBufferPx);\n  }\n\n  static ngAcceptInputType_itemSize: NumberInput;\n  static ngAcceptInputType_minBufferPx: NumberInput;\n  static ngAcceptInputType_maxBufferPx: NumberInput;\n}\n"]}