@yoozly/ngx-parallax/esm2022/lib/ngx-parallax-standalone.directive.mjs

Use parallax effect with Angular 16-17 compatible universal (standalone and ngModule)

import { Directive, Input } from '@angular/core';
import { fromEvent, of, Subject } from 'rxjs';
import { takeUntil, filter, map, debounceTime, mergeMap } from 'rxjs/operators';
import * as i0 from "@angular/core";
import * as i1 from "./services/windowref.service";
export class ParallaxStandaloneDirective {
    hostElement;
    renderer;
    wr;
    speed = 30;
    axe = 'y';
    property = 'transform';
    propertyValue = 'translate3d';
    active = true;
    inViewport = true;
    observer;
    element;
    initialPosition;
    componentDestroy$ = new Subject();
    windowScroll$;
    windowResize$;
    constructor(hostElement, renderer, wr) {
        this.hostElement = hostElement;
        this.renderer = renderer;
        this.wr = wr;
    }
    ngAfterViewInit() {
        this.element = this.hostElement.nativeElement;
        if (this.element && this.wr.nativeWindow && !this.observer) {
            this.initParallax();
        }
    }
    initParallax() {
        this.observer = this.createObserver(0);
        this.observer.observe(this.element);
        const parallax$ = of('').pipe(takeUntil(this.componentDestroy$), filter(() => this.active && this.inViewport), map(() => {
            const coef = this.calculateCoef();
            this.renderParallax(coef);
            return coef;
        }));
        this.windowScroll$ = fromEvent(this.wr.nativeWindow, 'scroll').pipe(mergeMap(() => parallax$));
        this.windowResize$ = fromEvent(this.wr.nativeWindow, 'resize').pipe(debounceTime(500), mergeMap(() => parallax$));
    }
    startParallax() {
        this.inViewport = true;
        if (this.wr.nativeWindow && this.initialPosition === undefined) {
            this.initialPosition = this.wr.nativeWindow.pageYOffset;
            this.windowScroll$.subscribe();
            this.windowResize$.subscribe();
        }
    }
    destroyParallax() {
        this.inViewport = false;
    }
    calculateCoef() {
        return ((this.wr.nativeWindow.pageYOffset - this.initialPosition) *
            (this.speed / 100));
    }
    renderParallax(coef) {
        this.renderer.setStyle(this.element, this.property, this.getPropertyValue(coef));
    }
    getPropertyValue(coef) {
        let result = `${coef}px`;
        if (this.property === 'transform') {
            switch (this.propertyValue) {
                case 'translate3d':
                    result = `translate3d(${this.getAxe(coef)})`;
                    break;
                case 'scale':
                    result = `scale(${coef})`;
                    break;
                case 'rotate':
                    result = `rotate(${coef}deg)`;
                    break;
            }
        }
        switch (this.property) {
            case 'opacity':
                result = `${coef}`;
                break;
        }
        return result;
    }
    getAxe(coef) {
        let axe = [0, coef, 0];
        if (this.axe === 'x') {
            axe = [coef, 0, 0];
        }
        else if (this.axe === 'z') {
            axe = [0, 0, coef];
        }
        return `${axe[0]}px, ${axe[1]}px, ${axe[2]}px`;
    }
    createObserver(pourcent) {
        const options = {
            rootMargin: '0px',
            threshold: pourcent / 100
        };
        const isIntersecting = (entry) => entry.isIntersecting || entry.intersectionRatio > 0;
        return new IntersectionObserver((entries, observer) => {
            entries.forEach((entry) => {
                if (isIntersecting(entry)) {
                    this.startParallax();
                }
                else {
                    this.destroyParallax();
                }
            });
        }, options);
    }
    ngOnDestroy() {
        this.componentDestroy$.next(false);
        this.componentDestroy$.complete();
        if (this.wr.nativeWindow) {
            this.observer.disconnect();
        }
    }
    static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.2.3", ngImport: i0, type: ParallaxStandaloneDirective, deps: [{ token: i0.ElementRef }, { token: i0.Renderer2 }, { token: i1.BrowserWindowRef }], target: i0.ɵɵFactoryTarget.Directive });
    static ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "17.2.3", type: ParallaxStandaloneDirective, isStandalone: true, selector: "[ngx-parallax]", inputs: { speed: "speed", axe: "axe", property: "property", propertyValue: "propertyValue", active: "active" }, ngImport: i0 });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.2.3", ngImport: i0, type: ParallaxStandaloneDirective, decorators: [{
            type: Directive,
            args: [{
                    selector: '[ngx-parallax]',
                    standalone: true
                }]
        }], ctorParameters: () => [{ type: i0.ElementRef }, { type: i0.Renderer2 }, { type: i1.BrowserWindowRef }], propDecorators: { speed: [{
                type: Input
            }], axe: [{
                type: Input
            }], property: [{
                type: Input
            }], propertyValue: [{
                type: Input
            }], active: [{
                type: Input
            }] } });
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{\n  Directive,\n  Input,\n  ElementRef,\n  Renderer2,\n  OnDestroy,\n  AfterViewInit\n} from '@angular/core';\nimport { fromEvent, Observable, of, Subject } from 'rxjs';\nimport { takeUntil, filter, map, debounceTime, mergeMap } from 'rxjs/operators';\n\nimport { BrowserWindowRef } from './services/windowref.service';\n\n@Directive({\n  selector: '[ngx-parallax]',\n  standalone: true\n})\nexport class ParallaxStandaloneDirective implements OnDestroy, AfterViewInit {\n  @Input() speed = 30;\n  @Input() axe = 'y';\n  @Input() property = 'transform';\n  @Input() propertyValue = 'translate3d';\n  @Input() active = true;\n\n  private inViewport = true;\n  private observer: IntersectionObserver;\n  private element: HTMLElement;\n  private initialPosition: number;\n  private componentDestroy$ = new Subject<boolean>();\n  private windowScroll$: Observable<number>;\n  private windowResize$: Observable<number>;\n\n  constructor(\n    private hostElement: ElementRef,\n    private renderer: Renderer2,\n    private wr: BrowserWindowRef\n  ) {}\n\n  ngAfterViewInit() {\n    this.element = this.hostElement.nativeElement;\n\n    if (this.element && this.wr.nativeWindow && !this.observer) {\n      this.initParallax();\n    }\n  }\n\n  private initParallax(): void {\n    this.observer = this.createObserver(0);\n    this.observer.observe(this.element);\n\n    const parallax$ = of('').pipe(\n      takeUntil(this.componentDestroy$),\n      filter(() => this.active && this.inViewport),\n      map(() => {\n        const coef = this.calculateCoef();\n        this.renderParallax(coef);\n        return coef;\n      })\n    );\n\n    this.windowScroll$ = fromEvent(this.wr.nativeWindow, 'scroll').pipe(\n      mergeMap(() => parallax$)\n    );\n\n    this.windowResize$ = fromEvent(this.wr.nativeWindow, 'resize').pipe(\n      debounceTime(500),\n      mergeMap(() => parallax$)\n    );\n  }\n\n  private startParallax(): void {\n    this.inViewport = true;\n\n    if (this.wr.nativeWindow && this.initialPosition === undefined) {\n      this.initialPosition = this.wr.nativeWindow.pageYOffset;\n      this.windowScroll$.subscribe();\n      this.windowResize$.subscribe();\n    }\n  }\n\n  private destroyParallax(): void {\n    this.inViewport = false;\n  }\n\n  private calculateCoef(): number {\n    return (\n      (this.wr.nativeWindow.pageYOffset - this.initialPosition) *\n      (this.speed / 100)\n    );\n  }\n\n  private renderParallax(coef: number): void {\n    this.renderer.setStyle(\n      this.element,\n      this.property,\n      this.getPropertyValue(coef)\n    );\n  }\n\n  private getPropertyValue(coef: number): string {\n    let result = `${coef}px`;\n\n    if (this.property === 'transform') {\n      switch (this.propertyValue) {\n        case 'translate3d':\n          result = `translate3d(${this.getAxe(coef)})`;\n          break;\n        case 'scale':\n          result = `scale(${coef})`;\n          break;\n        case 'rotate':\n          result = `rotate(${coef}deg)`;\n          break;\n      }\n    }\n\n    switch (this.property) {\n      case 'opacity':\n        result = `${coef}`;\n        break;\n    }\n\n    return result;\n  }\n\n  private getAxe(coef: number): string {\n    let axe = [0, coef, 0];\n\n    if (this.axe === 'x') {\n      axe = [coef, 0, 0];\n    } else if (this.axe === 'z') {\n      axe = [0, 0, coef];\n    }\n\n    return `${axe[0]}px, ${axe[1]}px, ${axe[2]}px`;\n  }\n\n  private createObserver(pourcent: number) {\n    const options = {\n      rootMargin: '0px',\n      threshold: pourcent / 100\n    };\n\n    const isIntersecting = (entry: IntersectionObserverEntry) =>\n      entry.isIntersecting || entry.intersectionRatio > 0;\n\n    return new IntersectionObserver((entries, observer) => {\n      entries.forEach((entry) => {\n        if (isIntersecting(entry)) {\n          this.startParallax();\n        } else {\n          this.destroyParallax();\n        }\n      });\n    }, options);\n  }\n\n  ngOnDestroy() {\n    this.componentDestroy$.next(false);\n    this.componentDestroy$.complete();\n    if (this.wr.nativeWindow) {\n      this.observer.disconnect();\n    }\n  }\n}\n"]}