ontimize-web-ngx
Version:
Ontimize Web framework using Angular 15
86 lines • 12.7 kB
JavaScript
import { Injectable } from "@angular/core";
import { Subject } from "rxjs";
import { distinctUntilChanged } from "rxjs/operators";
import * as i0 from "@angular/core";
export class OTableVirtualScrollStrategy {
constructor() {
this.indexChange = new Subject();
this.scrolledIndexChange = this.indexChange.pipe(distinctUntilChanged());
this.stickyChange = new Subject();
this.bufferMultiplier = 1;
this._dataLength = 0;
}
get dataLength() {
return this._dataLength;
}
set dataLength(value) {
this._dataLength = value;
this.onDataLengthChanged();
}
attach(viewport) {
this.viewport = viewport;
this.onDataLengthChanged();
this.updateContent();
}
detach() {
}
destroy() {
this.indexChange.complete();
this.stickyChange.complete();
}
onContentRendered() {
}
onRenderedOffsetChanged() {
}
scrollToIndex(index, behavior) {
}
onContentScrolled() {
this.updateContent();
}
setConfig(rowHeight, headerHeight, footerHeight) {
if (this.rowHeight === rowHeight
&& this.headerHeight === headerHeight
&& this.footerHeight === footerHeight) {
return;
}
this.rowHeight = rowHeight;
this.headerHeight = headerHeight;
this.footerHeight = footerHeight;
this.onDataLengthChanged();
}
onDataLengthChanged() {
if (this.viewport) {
this.viewport.setTotalContentSize(this.dataLength * this.rowHeight + this.headerHeight + this.footerHeight);
this.viewport.scrollToOffset(0);
this.updateContent();
}
}
updateContent() {
if (!this.viewport || !this.rowHeight || this.dataLength === 0) {
return;
}
const scrollOffset = this.viewport.measureScrollOffset();
const itemsDisplayed = Math.ceil(this.viewport.getViewportSize() / this.rowHeight);
const renderedOffset = this.viewport.getOffsetToRenderedContentStart();
const start = renderedOffset / this.rowHeight;
const bufferItems = Math.ceil(itemsDisplayed * this.bufferMultiplier);
const bufferOffset = renderedOffset + bufferItems * this.rowHeight;
const relativeScrollOffset = scrollOffset - bufferOffset;
const rowsScrolled = relativeScrollOffset / this.rowHeight;
const displayed = scrollOffset / this.rowHeight;
this.indexChange.next(displayed);
const rowsToMove = Math.sign(rowsScrolled) * Math.floor(Math.abs(rowsScrolled));
const adjustedRenderedOffset = Math.max(0, renderedOffset + rowsToMove * this.rowHeight);
this.viewport.setRenderedContentOffset(adjustedRenderedOffset);
const adjustedStart = Math.max(0, start + rowsToMove);
const adjustedEnd = adjustedStart + itemsDisplayed + bufferItems;
this.viewport.setRenderedRange({ start: adjustedStart, end: adjustedEnd });
this.stickyChange.next(adjustedRenderedOffset);
}
}
OTableVirtualScrollStrategy.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.2.10", ngImport: i0, type: OTableVirtualScrollStrategy, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
OTableVirtualScrollStrategy.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.2.10", ngImport: i0, type: OTableVirtualScrollStrategy });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.2.10", ngImport: i0, type: OTableVirtualScrollStrategy, decorators: [{
type: Injectable
}] });
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{ CdkVirtualScrollViewport, VirtualScrollStrategy } from \"@angular/cdk/scrolling\";\nimport { Injectable } from \"@angular/core\";\nimport { Observable, Subject } from \"rxjs\";\nimport { distinctUntilChanged } from \"rxjs/operators\";\n\n@Injectable()\nexport class OTableVirtualScrollStrategy implements VirtualScrollStrategy {\n  private viewport: CdkVirtualScrollViewport;\n\n  private rowHeight!: number;\n  private headerHeight!: number;\n  private footerHeight!: number;\n  private readonly indexChange = new Subject<number>();\n  public scrolledIndexChange: Observable<number> = this.indexChange.pipe(distinctUntilChanged());\n  public readonly stickyChange = new Subject<number>();\n  private bufferMultiplier: number = 1;\n\n  get dataLength(): number {\n    return this._dataLength;\n  }\n\n  set dataLength(value: number) {\n    this._dataLength = value;\n    this.onDataLengthChanged();\n  }\n\n  private _dataLength = 0;\n\n  public attach(viewport: CdkVirtualScrollViewport): void {\n    this.viewport = viewport;\n    this.onDataLengthChanged();\n    this.updateContent();\n  }\n\n  public detach(): void {\n    //no-op\n  }\n\n  public destroy(): void {\n    this.indexChange.complete();\n    this.stickyChange.complete();\n  }\n\n  public onContentRendered(): void {\n    // no-op\n  }\n\n  public onRenderedOffsetChanged(): void {\n    // no-op\n  }\n\n  public scrollToIndex(index: number, behavior?: ScrollBehavior): void {\n    // no-op\n  }\n\n  public onContentScrolled(): void {\n    this.updateContent();\n  }\n\n  public setConfig(rowHeight: number, headerHeight: number, footerHeight: number) {\n\n    if (\n      this.rowHeight === rowHeight\n      && this.headerHeight === headerHeight\n      && this.footerHeight === footerHeight\n    ) {\n      return;\n    }\n    this.rowHeight = rowHeight;\n    this.headerHeight = headerHeight;\n    this.footerHeight = footerHeight;\n    //if change heights, then update content size\n    this.onDataLengthChanged();\n  }\n\n  public onDataLengthChanged(): void {\n    if (this.viewport) {\n      this.viewport.setTotalContentSize(this.dataLength * this.rowHeight + this.headerHeight + this.footerHeight);\n      this.viewport.scrollToOffset(0);//set scroll up\n      this.updateContent();\n    }\n  }\n\n  private updateContent() {\n    if (!this.viewport || !this.rowHeight || this.dataLength === 0) {\n      return;\n    }\n    const scrollOffset = this.viewport.measureScrollOffset();\n    const itemsDisplayed = Math.ceil(this.viewport.getViewportSize() / this.rowHeight);\n    const renderedOffset = this.viewport.getOffsetToRenderedContentStart();\n    const start = renderedOffset / this.rowHeight;\n    const bufferItems = Math.ceil(itemsDisplayed * this.bufferMultiplier);\n    const bufferOffset = renderedOffset + bufferItems * this.rowHeight;\n\n    const relativeScrollOffset = scrollOffset - bufferOffset;// How far the scroll offset is from the lower buffer, which is usually where items start being displayed\n    const rowsScrolled = relativeScrollOffset / this.rowHeight;\n\n    const displayed = scrollOffset / this.rowHeight;\n    this.indexChange.next(displayed);\n\n    const rowsToMove = Math.sign(rowsScrolled) * Math.floor(Math.abs(rowsScrolled));\n\n    const adjustedRenderedOffset = Math.max(0, renderedOffset + rowsToMove * this.rowHeight);\n    this.viewport.setRenderedContentOffset(adjustedRenderedOffset);\n\n    const adjustedStart = Math.max(0, start + rowsToMove);\n    const adjustedEnd = adjustedStart + itemsDisplayed + bufferItems;\n    this.viewport.setRenderedRange({ start: adjustedStart, end: adjustedEnd });\n    this.stickyChange.next(adjustedRenderedOffset);\n  }\n}"]}