ng-cdk-table-virtual-scroll
Version:
Virtual scroll for for Angular Cdk Table
88 lines • 12.8 kB
JavaScript
import { __decorate } from "tslib";
import { Injectable } from '@angular/core';
import { distinctUntilChanged } from 'rxjs/operators';
import { BehaviorSubject, Subject } from 'rxjs';
let FixedSizeTableVirtualScrollStrategy = class FixedSizeTableVirtualScrollStrategy {
constructor() {
this.indexChange = new Subject();
this.stickyChange = new Subject();
this.renderedRangeStream = new BehaviorSubject({ start: 0, end: 0 });
this.scrolledIndexChange = this.indexChange.pipe(distinctUntilChanged());
this._dataLength = 0;
}
get dataLength() {
return this._dataLength;
}
set dataLength(value) {
this._dataLength = value;
this.onDataLengthChanged();
}
attach(viewport) {
this.viewport = viewport;
this.viewport.renderedRangeStream.subscribe(this.renderedRangeStream);
this.onDataLengthChanged();
}
detach() {
this.indexChange.complete();
this.stickyChange.complete();
this.renderedRangeStream.complete();
}
onContentScrolled() {
this.updateContent();
}
onDataLengthChanged() {
if (this.viewport) {
this.viewport.setTotalContentSize(this.dataLength * this.rowHeight + this.headerHeight + this.footerHeight);
}
this.updateContent();
}
onContentRendered() {
// no-op
}
onRenderedOffsetChanged() {
// no-op
}
scrollToIndex(index, behavior) {
if (!this.viewport || !this.rowHeight) {
return;
}
this.viewport.scrollToOffset((index - 1) * this.rowHeight + this.headerHeight);
}
setConfig(configs) {
const { rowHeight, headerHeight, footerHeight, bufferMultiplier } = configs;
if (this.rowHeight === rowHeight
&& this.headerHeight === headerHeight
&& this.footerHeight === footerHeight
&& this.bufferMultiplier === bufferMultiplier) {
return;
}
this.rowHeight = rowHeight;
this.headerHeight = headerHeight;
this.footerHeight = footerHeight;
this.bufferMultiplier = bufferMultiplier;
this.onDataLengthChanged();
}
updateContent() {
if (!this.viewport || !this.rowHeight) {
return;
}
const scrollOffset = this.viewport.measureScrollOffset();
const amount = Math.ceil(this.viewport.getViewportSize() / this.rowHeight);
const offset = Math.max(scrollOffset - this.headerHeight, 0);
const buffer = Math.ceil(amount * this.bufferMultiplier);
const skip = Math.round(offset / this.rowHeight);
const index = Math.max(0, skip);
const start = Math.max(0, index - buffer);
const end = Math.min(this.dataLength, index + amount + buffer);
const renderedOffset = start * this.rowHeight;
this.viewport.setRenderedContentOffset(renderedOffset);
this.viewport.setRenderedRange({ start, end });
this.indexChange.next(index);
this.stickyChange.next(renderedOffset);
}
};
FixedSizeTableVirtualScrollStrategy = __decorate([
Injectable()
], FixedSizeTableVirtualScrollStrategy);
export { FixedSizeTableVirtualScrollStrategy };
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{ Injectable } from '@angular/core';\r\nimport { distinctUntilChanged } from 'rxjs/operators';\r\nimport { BehaviorSubject, Subject } from 'rxjs';\r\nimport { CdkVirtualScrollViewport, VirtualScrollStrategy } from '@angular/cdk/scrolling';\r\nimport { ListRange } from '@angular/cdk/collections';\r\n\r\nexport interface TSVStrategyConfigs {\r\n  rowHeight: number;\r\n  headerHeight: number;\r\n  footerHeight: number;\r\n  bufferMultiplier: number;\r\n}\r\n\r\n@Injectable()\r\nexport class FixedSizeTableVirtualScrollStrategy implements VirtualScrollStrategy {\r\n  private rowHeight!: number;\r\n  private headerHeight!: number;\r\n  private footerHeight!: number;\r\n  private bufferMultiplier!: number;\r\n  private indexChange = new Subject<number>();\r\n  public stickyChange = new Subject<number>();\r\n\r\n  public viewport: CdkVirtualScrollViewport;\r\n\r\n  public renderedRangeStream = new BehaviorSubject<ListRange>({start: 0, end: 0});\r\n\r\n  public scrolledIndexChange = this.indexChange.pipe(distinctUntilChanged());\r\n\r\n  get dataLength(): number {\r\n    return this._dataLength;\r\n  }\r\n\r\n  set dataLength(value: number) {\r\n    this._dataLength = value;\r\n    this.onDataLengthChanged();\r\n  }\r\n\r\n  private _dataLength = 0;\r\n\r\n  public attach(viewport: CdkVirtualScrollViewport): void {\r\n    this.viewport = viewport;\r\n    this.viewport.renderedRangeStream.subscribe(this.renderedRangeStream);\r\n    this.onDataLengthChanged();\r\n  }\r\n\r\n  public detach(): void {\r\n    this.indexChange.complete();\r\n    this.stickyChange.complete();\r\n    this.renderedRangeStream.complete();\r\n  }\r\n\r\n  public onContentScrolled(): void {\r\n    this.updateContent();\r\n  }\r\n\r\n  public onDataLengthChanged(): void {\r\n    if (this.viewport) {\r\n      this.viewport.setTotalContentSize(this.dataLength * this.rowHeight + this.headerHeight + this.footerHeight);\r\n    }\r\n    this.updateContent();\r\n  }\r\n\r\n  public onContentRendered(): void {\r\n    // no-op\r\n  }\r\n\r\n  public onRenderedOffsetChanged(): void {\r\n    // no-op\r\n  }\r\n\r\n  public scrollToIndex(index: number, behavior?: ScrollBehavior): void {\r\n    if (!this.viewport || !this.rowHeight) {\r\n      return;\r\n    }\r\n    this.viewport.scrollToOffset((index - 1 ) * this.rowHeight + this.headerHeight);\r\n  }\r\n\r\n  public setConfig(configs: TSVStrategyConfigs) {\r\n    const {rowHeight, headerHeight, footerHeight, bufferMultiplier} = configs;\r\n    if (\r\n      this.rowHeight === rowHeight\r\n      && this.headerHeight === headerHeight\r\n      && this.footerHeight === footerHeight\r\n      && this.bufferMultiplier === bufferMultiplier\r\n    ) {\r\n      return;\r\n    }\r\n    this.rowHeight = rowHeight;\r\n    this.headerHeight = headerHeight;\r\n    this.footerHeight = footerHeight;\r\n    this.bufferMultiplier = bufferMultiplier;\r\n    this.onDataLengthChanged();\r\n  }\r\n\r\n  private updateContent() {\r\n    if (!this.viewport || !this.rowHeight) {\r\n      return;\r\n    }\r\n    const scrollOffset = this.viewport.measureScrollOffset();\r\n    const amount = Math.ceil(this.viewport.getViewportSize() / this.rowHeight);\r\n    const offset = Math.max(scrollOffset - this.headerHeight, 0);\r\n    const buffer = Math.ceil(amount * this.bufferMultiplier);\r\n\r\n    const skip = Math.round(offset / this.rowHeight);\r\n    const index = Math.max(0, skip);\r\n    const start = Math.max(0, index - buffer);\r\n    const end = Math.min(this.dataLength, index + amount + buffer);\r\n    const renderedOffset = start * this.rowHeight;\r\n    this.viewport.setRenderedContentOffset(renderedOffset);\r\n    this.viewport.setRenderedRange({start, end});\r\n    this.indexChange.next(index);\r\n    this.stickyChange.next(renderedOffset);\r\n  }\r\n}\r\n"]}