@angular/cdk
Version:
Angular Material Component Development Kit
189 lines • 26.7 kB
JavaScript
/**
* @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. */
var FixedSizeVirtualScrollStrategy = /** @class */ (function () {
/**
* @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.
*/
function FixedSizeVirtualScrollStrategy(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.
*/
FixedSizeVirtualScrollStrategy.prototype.attach = function (viewport) {
this._viewport = viewport;
this._updateTotalContentSize();
this._updateRenderedRange();
};
/** Detaches this scroll strategy from the currently attached viewport. */
FixedSizeVirtualScrollStrategy.prototype.detach = function () {
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.
*/
FixedSizeVirtualScrollStrategy.prototype.updateItemAndBufferSize = function (itemSize, minBufferPx, maxBufferPx) {
if (maxBufferPx < minBufferPx) {
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. */
FixedSizeVirtualScrollStrategy.prototype.onContentScrolled = function () {
this._updateRenderedRange();
};
/** @docs-private Implemented as part of VirtualScrollStrategy. */
FixedSizeVirtualScrollStrategy.prototype.onDataLengthChanged = function () {
this._updateTotalContentSize();
this._updateRenderedRange();
};
/** @docs-private Implemented as part of VirtualScrollStrategy. */
FixedSizeVirtualScrollStrategy.prototype.onContentRendered = function () { };
/** @docs-private Implemented as part of VirtualScrollStrategy. */
FixedSizeVirtualScrollStrategy.prototype.onRenderedOffsetChanged = function () { };
/**
* 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.
*/
FixedSizeVirtualScrollStrategy.prototype.scrollToIndex = function (index, behavior) {
if (this._viewport) {
this._viewport.scrollToOffset(index * this._itemSize, behavior);
}
};
/** Update the viewport's total content size. */
FixedSizeVirtualScrollStrategy.prototype._updateTotalContentSize = function () {
if (!this._viewport) {
return;
}
this._viewport.setTotalContentSize(this._viewport.getDataLength() * this._itemSize);
};
/** Update the viewport's rendered range. */
FixedSizeVirtualScrollStrategy.prototype._updateRenderedRange = function () {
if (!this._viewport) {
return;
}
var scrollOffset = this._viewport.measureScrollOffset();
var firstVisibleIndex = scrollOffset / this._itemSize;
var renderedRange = this._viewport.getRenderedRange();
var newRange = { start: renderedRange.start, end: renderedRange.end };
var viewportSize = this._viewport.getViewportSize();
var dataLength = this._viewport.getDataLength();
var startBuffer = scrollOffset - newRange.start * this._itemSize;
if (startBuffer < this._minBufferPx && newRange.start != 0) {
var 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 {
var endBuffer = newRange.end * this._itemSize - (scrollOffset + viewportSize);
if (endBuffer < this._minBufferPx && newRange.end != dataLength) {
var 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));
};
return FixedSizeVirtualScrollStrategy;
}());
export { FixedSizeVirtualScrollStrategy };
/**
* 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. */
var CdkFixedSizeVirtualScroll = /** @class */ (function () {
function CdkFixedSizeVirtualScroll() {
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);
}
Object.defineProperty(CdkFixedSizeVirtualScroll.prototype, "itemSize", {
/** The size of the items in the list (in pixels). */
get: function () { return this._itemSize; },
set: function (value) { this._itemSize = coerceNumberProperty(value); },
enumerable: true,
configurable: true
});
Object.defineProperty(CdkFixedSizeVirtualScroll.prototype, "minBufferPx", {
/**
* 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: function () { return this._minBufferPx; },
set: function (value) { this._minBufferPx = coerceNumberProperty(value); },
enumerable: true,
configurable: true
});
Object.defineProperty(CdkFixedSizeVirtualScroll.prototype, "maxBufferPx", {
/**
* The number of pixels worth of buffer to render for when rendering new items. Defaults to 200px.
*/
get: function () { return this._maxBufferPx; },
set: function (value) { this._maxBufferPx = coerceNumberProperty(value); },
enumerable: true,
configurable: true
});
CdkFixedSizeVirtualScroll.prototype.ngOnChanges = function () {
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(function () { return CdkFixedSizeVirtualScroll; })],
}],
},] }
];
CdkFixedSizeVirtualScroll.propDecorators = {
itemSize: [{ type: Input }],
minBufferPx: [{ type: Input }],
maxBufferPx: [{ type: Input }]
};
return CdkFixedSizeVirtualScroll;
}());
export { CdkFixedSizeVirtualScroll };
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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\n/** Virtual scrolling strategy for lists with items of known fixed size. */\nexport class FixedSizeVirtualScrollStrategy implements VirtualScrollStrategy {\n  private _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) {\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() { /* 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 scrollOffset = this._viewport.measureScrollOffset();\n    const firstVisibleIndex = scrollOffset / this._itemSize;\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\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"]}