@angular/cdk/esm2020/scrolling/fixed-size-virtual-scroll.mjs

/**
 * @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';
import * as i0 from "@angular/core";
/** 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() {
        /* no-op */
    }
    /** @docs-private Implemented as part of VirtualScrollStrategy. */
    onRenderedOffsetChanged() {
        /* no-op */
    }
    /**
     * 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.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: CdkFixedSizeVirtualScroll, deps: [], target: i0.ɵɵFactoryTarget.Directive });
CdkFixedSizeVirtualScroll.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "14.0.1", type: CdkFixedSizeVirtualScroll, selector: "cdk-virtual-scroll-viewport[itemSize]", inputs: { itemSize: "itemSize", minBufferPx: "minBufferPx", maxBufferPx: "maxBufferPx" }, providers: [
        {
            provide: VIRTUAL_SCROLL_STRATEGY,
            useFactory: _fixedSizeVirtualScrollStrategyFactory,
            deps: [forwardRef(() => CdkFixedSizeVirtualScroll)],
        },
    ], usesOnChanges: true, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: CdkFixedSizeVirtualScroll, decorators: [{
            type: Directive,
            args: [{
                    selector: 'cdk-virtual-scroll-viewport[itemSize]',
                    providers: [
                        {
                            provide: VIRTUAL_SCROLL_STRATEGY,
                            useFactory: _fixedSizeVirtualScrollStrategyFactory,
                            deps: [forwardRef(() => 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 {coerceNumberProperty, NumberInput} 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/** 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 strategy to a viewport.\n   * @param viewport The viewport to attach this strategy to.\n   */\n  attach(viewport: CdkVirtualScrollViewport) {\n    this._viewport = viewport;\n    this._updateTotalContentSize();\n    this._updateRenderedRange();\n  }\n\n  /** Detaches this scroll strategy from the currently attached viewport. */\n  detach() {\n    this._scrolledIndexChange.complete();\n    this._viewport = null;\n  }\n\n  /**\n   * Update the item size and buffer size.\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  updateItemAndBufferSize(itemSize: number, minBufferPx: number, maxBufferPx: number) {\n    if (maxBufferPx < minBufferPx && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw Error('CDK virtual scroll: maxBufferPx must be greater than or 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() {\n    /* no-op */\n  }\n\n  /** @docs-private Implemented as part of VirtualScrollStrategy. */\n  onRenderedOffsetChanged() {\n    /* no-op */\n  }\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(\n        0,\n        Math.min(firstVisibleIndex, dataLength - maxVisibleItems),\n      );\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(\n        dataLength,\n        Math.ceil(firstVisibleIndex + (viewportSize + this._minBufferPx) / this._itemSize),\n      );\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(\n            0,\n            Math.floor(firstVisibleIndex - this._minBufferPx / this._itemSize),\n          );\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 * 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/** A virtual scroll strategy that supports fixed-size items. */\n@Directive({\n  selector: 'cdk-virtual-scroll-viewport[itemSize]',\n  providers: [\n    {\n      provide: VIRTUAL_SCROLL_STRATEGY,\n      useFactory: _fixedSizeVirtualScrollStrategyFactory,\n      deps: [forwardRef(() => CdkFixedSizeVirtualScroll)],\n    },\n  ],\n})\nexport class CdkFixedSizeVirtualScroll implements OnChanges {\n  /** The size of the items in the list (in pixels). */\n  @Input()\n  get itemSize(): number {\n    return this._itemSize;\n  }\n  set itemSize(value: NumberInput) {\n    this._itemSize = coerceNumberProperty(value);\n  }\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 {\n    return this._minBufferPx;\n  }\n  set minBufferPx(value: NumberInput) {\n    this._minBufferPx = coerceNumberProperty(value);\n  }\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 {\n    return this._maxBufferPx;\n  }\n  set maxBufferPx(value: NumberInput) {\n    this._maxBufferPx = coerceNumberProperty(value);\n  }\n  _maxBufferPx = 200;\n\n  /** The scroll strategy used by this directive. */\n  _scrollStrategy = new FixedSizeVirtualScrollStrategy(\n    this.itemSize,\n    this.minBufferPx,\n    this.maxBufferPx,\n  );\n\n  ngOnChanges() {\n    this._scrollStrategy.updateItemAndBufferSize(this.itemSize, this.minBufferPx, this.maxBufferPx);\n  }\n}\n"]}