ng-cdk-table-virtual-scroll
Version:
Virtual scroll for for Angular Cdk Table
168 lines • 22.7 kB
JavaScript
var TableItemSizeDirective_1;
import { __decorate } from "tslib";
import { AfterContentInit, ContentChild, Directive, forwardRef, Input, NgZone, OnChanges, OnDestroy, } from '@angular/core';
import { distinctUntilChanged, filter, map, switchMap, takeUntil, takeWhile, tap, } from 'rxjs/operators';
import { Subject } from 'rxjs';
import { VIRTUAL_SCROLL_STRATEGY } from '@angular/cdk/scrolling';
import { CdkTable } from '@angular/cdk/table';
import { TableVirtualScrollDataSource } from './table-data-source';
import { FixedSizeTableVirtualScrollStrategy } from './fixed-size-table-virtual-scroll-strategy';
export function _tableVirtualScrollDirectiveStrategyFactory(tableDir) {
return tableDir.scrollStrategy;
}
const stickyHeaderSelector = '.cdk-header-row .cdk-table-sticky';
const stickyFooterSelector = '.cdk-footer-row .cdk-table-sticky';
const defaults = {
rowHeight: 48,
headerHeight: 56,
headerEnabled: true,
footerHeight: 48,
footerEnabled: false,
bufferMultiplier: 0.7,
};
let TableItemSizeDirective = TableItemSizeDirective_1 = class TableItemSizeDirective {
constructor(zone) {
this.zone = zone;
this.alive = true;
// tslint:disable-next-line:no-input-rename
this.rowHeight = defaults.rowHeight;
this.headerEnabled = defaults.headerEnabled;
this.headerHeight = defaults.headerHeight;
this.footerEnabled = defaults.footerEnabled;
this.footerHeight = defaults.footerHeight;
this.bufferMultiplier = defaults.bufferMultiplier;
this.scrollStrategy = new FixedSizeTableVirtualScrollStrategy();
this.dataSourceChanges = new Subject();
}
ngOnDestroy() {
this.alive = false;
this.dataSourceChanges.complete();
}
isAlive() {
return () => this.alive;
}
isStickyEnabled() {
return (!!this.scrollStrategy.viewport &&
this.table['_headerRowDefs']
.map((def) => def.sticky)
.reduce((prevState, state) => prevState && state, true));
}
ngAfterContentInit() {
const switchDataSourceOrigin = this.table['_switchDataSource'];
this.table['_switchDataSource'] = (dataSource) => {
switchDataSourceOrigin.call(this.table, dataSource);
this.connectDataSource(dataSource);
};
this.connectDataSource(this.table.dataSource);
this.scrollStrategy.stickyChange
.pipe(filter(() => this.isStickyEnabled()), tap(() => {
if (!this.stickyPositions) {
this.initStickyPositions();
}
}), takeWhile(this.isAlive()))
.subscribe((stickyOffset) => {
this.setSticky(stickyOffset);
});
}
connectDataSource(dataSource) {
this.dataSourceChanges.next();
if (dataSource instanceof TableVirtualScrollDataSource) {
dataSource.dataToRender$
.pipe(distinctUntilChanged(), takeUntil(this.dataSourceChanges), takeWhile(this.isAlive()), tap((data) => (this.scrollStrategy.dataLength = data.length)), switchMap((data) => this.scrollStrategy.renderedRangeStream.pipe(map(({ start, end }) => typeof start !== 'number' || typeof end !== 'number'
? data
: data.slice(start, end)))))
.subscribe((data) => {
this.zone.run(() => {
dataSource.dataOfRange$.next(data);
});
});
}
else {
throw new Error('[tvsItemSize] requires TableVirtualScrollDataSource be set as [dataSource] of [cdk-table]');
}
}
ngOnChanges() {
const config = {
rowHeight: +this.rowHeight || defaults.rowHeight,
headerHeight: this.headerEnabled
? +this.headerHeight || defaults.headerHeight
: 0,
footerHeight: this.footerEnabled
? +this.footerHeight || defaults.footerHeight
: 0,
bufferMultiplier: +this.bufferMultiplier || defaults.bufferMultiplier,
};
this.scrollStrategy.setConfig(config);
}
setSticky(offset) {
this.scrollStrategy.viewport.elementRef.nativeElement
.querySelectorAll(stickyHeaderSelector)
.forEach((el) => {
const parent = el.parentElement;
let baseOffset = 0;
if (this.stickyPositions.has(parent)) {
baseOffset = this.stickyPositions.get(parent);
}
el.style.top = `${baseOffset - offset}px`;
});
this.scrollStrategy.viewport.elementRef.nativeElement
.querySelectorAll(stickyFooterSelector)
.forEach((el) => {
const parent = el.parentElement;
let baseOffset = 0;
if (this.stickyPositions.has(parent)) {
baseOffset = this.stickyPositions.get(parent);
}
el.style.bottom = `${-baseOffset + offset}px`;
});
}
initStickyPositions() {
this.stickyPositions = new Map();
this.scrollStrategy.viewport.elementRef.nativeElement
.querySelectorAll(stickyHeaderSelector)
.forEach((el) => {
const parent = el.parentElement;
if (!this.stickyPositions.has(parent)) {
this.stickyPositions.set(parent, parent.offsetTop);
}
});
}
};
TableItemSizeDirective.ctorParameters = () => [
{ type: NgZone }
];
__decorate([
Input('tvsItemSize')
], TableItemSizeDirective.prototype, "rowHeight", void 0);
__decorate([
Input()
], TableItemSizeDirective.prototype, "headerEnabled", void 0);
__decorate([
Input()
], TableItemSizeDirective.prototype, "headerHeight", void 0);
__decorate([
Input()
], TableItemSizeDirective.prototype, "footerEnabled", void 0);
__decorate([
Input()
], TableItemSizeDirective.prototype, "footerHeight", void 0);
__decorate([
Input()
], TableItemSizeDirective.prototype, "bufferMultiplier", void 0);
__decorate([
ContentChild(CdkTable, { static: false })
], TableItemSizeDirective.prototype, "table", void 0);
TableItemSizeDirective = TableItemSizeDirective_1 = __decorate([
Directive({
selector: 'cdk-virtual-scroll-viewport[tvsItemSize]',
providers: [
{
provide: VIRTUAL_SCROLL_STRATEGY,
useFactory: _tableVirtualScrollDirectiveStrategyFactory,
deps: [forwardRef(() => TableItemSizeDirective_1)],
},
],
})
], TableItemSizeDirective);
export { TableItemSizeDirective };
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{\r\n  AfterContentInit,\r\n  ContentChild,\r\n  Directive,\r\n  forwardRef,\r\n  Input,\r\n  NgZone,\r\n  OnChanges,\r\n  OnDestroy,\r\n} from '@angular/core';\r\nimport {\r\n  distinctUntilChanged,\r\n  filter,\r\n  map,\r\n  switchMap,\r\n  takeUntil,\r\n  takeWhile,\r\n  tap,\r\n} from 'rxjs/operators';\r\nimport { Subject } from 'rxjs';\r\nimport { VIRTUAL_SCROLL_STRATEGY } from '@angular/cdk/scrolling';\r\nimport { CdkHeaderRowDef, CdkTable } from '@angular/cdk/table';\r\n\r\nimport { TableVirtualScrollDataSource } from './table-data-source';\r\nimport { FixedSizeTableVirtualScrollStrategy } from './fixed-size-table-virtual-scroll-strategy';\r\n\r\nexport function _tableVirtualScrollDirectiveStrategyFactory(\r\n  tableDir: TableItemSizeDirective\r\n) {\r\n  return tableDir.scrollStrategy;\r\n}\r\n\r\nconst stickyHeaderSelector = '.cdk-header-row .cdk-table-sticky';\r\nconst stickyFooterSelector = '.cdk-footer-row .cdk-table-sticky';\r\n\r\nconst defaults = {\r\n  rowHeight: 48,\r\n  headerHeight: 56,\r\n  headerEnabled: true,\r\n  footerHeight: 48,\r\n  footerEnabled: false,\r\n  bufferMultiplier: 0.7,\r\n};\r\n\r\n@Directive({\r\n  selector: 'cdk-virtual-scroll-viewport[tvsItemSize]',\r\n  providers: [\r\n    {\r\n      provide: VIRTUAL_SCROLL_STRATEGY,\r\n      useFactory: _tableVirtualScrollDirectiveStrategyFactory,\r\n      deps: [forwardRef(() => TableItemSizeDirective)],\r\n    },\r\n  ],\r\n})\r\nexport class TableItemSizeDirective\r\n  implements OnChanges, AfterContentInit, OnDestroy {\r\n  private alive = true;\r\n\r\n  // tslint:disable-next-line:no-input-rename\r\n  @Input('tvsItemSize')\r\n  rowHeight = defaults.rowHeight;\r\n\r\n  @Input()\r\n  headerEnabled = defaults.headerEnabled;\r\n\r\n  @Input()\r\n  headerHeight = defaults.headerHeight;\r\n\r\n  @Input()\r\n  footerEnabled = defaults.footerEnabled;\r\n\r\n  @Input()\r\n  footerHeight = defaults.footerHeight;\r\n\r\n  @Input()\r\n  bufferMultiplier = defaults.bufferMultiplier;\r\n\r\n  @ContentChild(CdkTable, { static: false })\r\n  table: CdkTable<any>;\r\n\r\n  scrollStrategy = new FixedSizeTableVirtualScrollStrategy();\r\n\r\n  dataSourceChanges = new Subject<void>();\r\n\r\n  private stickyPositions: Map<HTMLElement, number>;\r\n\r\n  constructor(private zone: NgZone) {}\r\n\r\n  ngOnDestroy() {\r\n    this.alive = false;\r\n    this.dataSourceChanges.complete();\r\n  }\r\n\r\n  private isAlive() {\r\n    return () => this.alive;\r\n  }\r\n\r\n  private isStickyEnabled(): boolean {\r\n    return (\r\n      !!this.scrollStrategy.viewport &&\r\n      (this.table['_headerRowDefs'] as CdkHeaderRowDef[])\r\n        .map((def) => def.sticky)\r\n        .reduce((prevState, state) => prevState && state, true)\r\n    );\r\n  }\r\n\r\n  ngAfterContentInit() {\r\n    const switchDataSourceOrigin = this.table['_switchDataSource'];\r\n    this.table['_switchDataSource'] = (dataSource: any) => {\r\n      switchDataSourceOrigin.call(this.table, dataSource);\r\n      this.connectDataSource(dataSource);\r\n    };\r\n\r\n    this.connectDataSource(this.table.dataSource);\r\n\r\n    this.scrollStrategy.stickyChange\r\n      .pipe(\r\n        filter(() => this.isStickyEnabled()),\r\n        tap(() => {\r\n          if (!this.stickyPositions) {\r\n            this.initStickyPositions();\r\n          }\r\n        }),\r\n        takeWhile(this.isAlive())\r\n      )\r\n      .subscribe((stickyOffset) => {\r\n        this.setSticky(stickyOffset);\r\n      });\r\n  }\r\n\r\n  connectDataSource(dataSource: any) {\r\n    this.dataSourceChanges.next();\r\n    if (dataSource instanceof TableVirtualScrollDataSource) {\r\n      dataSource.dataToRender$\r\n        .pipe(\r\n          distinctUntilChanged(),\r\n          takeUntil(this.dataSourceChanges),\r\n          takeWhile(this.isAlive()),\r\n          tap((data) => (this.scrollStrategy.dataLength = data.length)),\r\n          switchMap((data) =>\r\n            this.scrollStrategy.renderedRangeStream.pipe(\r\n              map(({ start, end }) =>\r\n                typeof start !== 'number' || typeof end !== 'number'\r\n                  ? data\r\n                  : data.slice(start, end)\r\n              )\r\n            )\r\n          )\r\n        )\r\n        .subscribe((data) => {\r\n          this.zone.run(() => {\r\n            dataSource.dataOfRange$.next(data);\r\n          });\r\n        });\r\n    } else {\r\n      throw new Error(\r\n        '[tvsItemSize] requires TableVirtualScrollDataSource be set as [dataSource] of [cdk-table]'\r\n      );\r\n    }\r\n  }\r\n\r\n  ngOnChanges() {\r\n    const config = {\r\n      rowHeight: +this.rowHeight || defaults.rowHeight,\r\n      headerHeight: this.headerEnabled\r\n        ? +this.headerHeight || defaults.headerHeight\r\n        : 0,\r\n      footerHeight: this.footerEnabled\r\n        ? +this.footerHeight || defaults.footerHeight\r\n        : 0,\r\n      bufferMultiplier: +this.bufferMultiplier || defaults.bufferMultiplier,\r\n    };\r\n    this.scrollStrategy.setConfig(config);\r\n  }\r\n\r\n  setSticky(offset) {\r\n    this.scrollStrategy.viewport.elementRef.nativeElement\r\n      .querySelectorAll(stickyHeaderSelector)\r\n      .forEach((el: HTMLElement) => {\r\n        const parent = el.parentElement;\r\n        let baseOffset = 0;\r\n        if (this.stickyPositions.has(parent)) {\r\n          baseOffset = this.stickyPositions.get(parent);\r\n        }\r\n        el.style.top = `${baseOffset - offset}px`;\r\n      });\r\n    this.scrollStrategy.viewport.elementRef.nativeElement\r\n      .querySelectorAll(stickyFooterSelector)\r\n      .forEach((el: HTMLElement) => {\r\n        const parent = el.parentElement;\r\n        let baseOffset = 0;\r\n        if (this.stickyPositions.has(parent)) {\r\n          baseOffset = this.stickyPositions.get(parent);\r\n        }\r\n        el.style.bottom = `${-baseOffset + offset}px`;\r\n      });\r\n  }\r\n\r\n  private initStickyPositions() {\r\n    this.stickyPositions = new Map<HTMLElement, number>();\r\n    this.scrollStrategy.viewport.elementRef.nativeElement\r\n      .querySelectorAll(stickyHeaderSelector)\r\n      .forEach((el) => {\r\n        const parent = el.parentElement;\r\n        if (!this.stickyPositions.has(parent)) {\r\n          this.stickyPositions.set(parent, parent.offsetTop);\r\n        }\r\n      });\r\n  }\r\n}\r\n"]}