كيفية عمل دليل خطوة بخطوة لتطبيقك (إذا كان مشروعك على Angular)

هندسة معمارية

npm i @angular/cdk @angular/material -S

@import '~@angular/cdk/overlay-prebuilt.css';
@import '~@angular/material/prebuilt-themes/deeppurple-amber.css';

ng generate library intro-lib

ng generate directive intro-trigger

@Directive({
  selector: '[libIntroTrigger]'
})
export class IntroTriggerDirective {
  @Input() libIntroTrigger: string;

  constructor(private introLibService: IntroLibService, private elementRef: ElementRef) {}

  @HostListener('click') showGuideMessage(): void {
    this.introLibService.show$.emit([this.libIntroTrigger, this.elementRef]);
  }
}

show$ = new EventEmitter<[string, ElementRef]>();

@Injectable({
  providedIn: 'root'
})
export class IntroLibService {
  private overlayRef: OverlayRef;
  show$ = new EventEmitter<[string, ElementRef]>();

  constructor(private readonly overlay: Overlay, private readonly ngZone: NgZone, private readonly injector: Injector) {
    this.show$.subscribe(([description, elementRef]: [string, ElementRef]) => {
      this.attach(elementRef, description);
    });
  }
}

• إغلاق التراكب الحالي (إن وجد)
• إنشاء إستراتيجية PositionStrong
• إنشاء OverlayRef
• إنشاء PortalInjector
• إرفاق مكون بطبقة

1. FlexibleConnectedPositionStr Strategy
2. الاستراتيجية العالمية

{
 ...
private getPositionStrategy(elementRef: ElementRef): PositionStrategy {
    return this.overlay
      .position()
      .flexibleConnectedTo(elementRef)
      .withViewportMargin(8) //     
      .withGrowAfterOpen(true) //           (, exspansion panel  )
      .withPositions([ //   ,            
        {
          originX: 'start',
          originY: 'bottom',
          overlayX: 'start',
          overlayY: 'top'
        },
        {
          originX: 'start',
          originY: 'top',
          overlayX: 'start',
          overlayY: 'bottom'
        },
        {
          originX: 'end',
          originY: 'bottom',
          overlayX: 'end',
          overlayY: 'top'
        },
        {
          originX: 'end',
          originY: 'top',
          overlayX: 'end',
          overlayY: 'bottom'
        }
      ]);
  }
...
}

createOverlay(elementRef: ElementRef): OverlayRef {
    const config = new OverlayConfig({
      positionStrategy: this.getPositionStrategy(elementRef),
      scrollStrategy: this.overlay.scrollStrategies.reposition()
    });

    return this.overlay.create(config);
  }

  attach(elementRef: ElementRef, description: string): void {
    if (this.overlayRef && this.overlayRef.hasAttached()) {
      this.overlayRef.dispose();
    }

    this.overlayRef = this.createOverlay(elementRef);

    const dataRef = this.ngZone.run(
      () => new DataRef(this.overlay, this.injector, this.overlayRef, elementRef, description)
    ); //   ,      ,    ,  CD    -  

    const injector = new PortalInjector(this.injector, new WeakMap([[DATA_TOKEN, dataRef]]));

    dataRef.overlayRef.attach(new ComponentPortal(IntroLibComponent, null, injector));
  }

@Component({
  selector: 'lib-intro-lib',
  template: `
    <mat-card>
      <mat-card-content> {{ data.description }}</mat-card-content>
    </mat-card>
  `,
  styles: ['mat-card {width: 300px; margin: 32px;}']
})
export class IntroLibComponent {
  constructor(@Inject(DATA_TOKEN) public data: DataRef) {}
}

export class DataRef {
  shadowOverlayRef: OverlayRef;

  constructor(
    private overlay: Overlay,
    private injector: Injector,
    public overlayRef: OverlayRef,
    public elementRef: ElementRef,
    public description: string
  ) {
    const config = new OverlayConfig({
      positionStrategy: this.overlay.position().global(),
      scrollStrategy: this.overlay.scrollStrategies.block()
    });

    this.shadowOverlayRef = this.overlay.create(config);

    this.shadowOverlayRef.attach(
      new ComponentPortal(
        ShadowOverlayComponent,
        null,
        new PortalInjector(this.injector, new WeakMap([[DATA_TOKEN, this.elementRef]]))
      )
    );
  }
}

مجموع