Open-ILS/src/eg2/src/app/share/util/can-deactivate.guard.ts

   1 import {Injectable} from '@angular/core';
   2 import {CanDeactivate} from '@angular/router';
   3 import {Observable} from 'rxjs';
   4
   5 /**
   6  * https://angular.io/guide/router#candeactivate-handling-unsaved-changes
   7  *
   8  * routing:
   9  * {
  10  *   path: 'record/:id/:tab',
  11  *   component: MyComponent,
  12  *   canDeactivate: [CanDeactivateGuard]
  13  * }
  14  *
  15  * export class MyComponent {
  16  *   canDeactivate() ... {
  17  *      ...
  18  *   }
  19  * }
  20  */
  21
  22 export interface CanComponentDeactivate {
  23     canDeactivate: () => Observable<boolean> | Promise<boolean> | boolean;
  24 }
  25
  26 @Injectable({providedIn: 'root'})
  27 export class CanDeactivateGuard
  28     implements CanDeactivate<CanComponentDeactivate> {
  29
  30     canDeactivate(component: CanComponentDeactivate) {
  31         return component.canDeactivate ? component.canDeactivate() : true;
  32     }
  33 }