Le service de configuration avertit ses observateurs lorsque le fichier de config JSON est chargé

src/app/components/app-setup/app-setup.component.ts

@@ -41,6 +41,7 @@ export class ApplicationSetupComponent extends BaseComponent implements Observer
         private intlService: InternationalisationService
     ) {
         super();
+        this.appSetupService.addObserver(this);
     }
 
     public get currentLanguageLabel(): string {
@@ -90,19 +91,26 @@ export class ApplicationSetupComponent extends BaseComponent implements Observer
 
     // interface Observer
     public update(sender: any, data: any): void {
-        const p: NgBaseParam = sender;
-        switch (p.symbol) {
-            case "dp":
-                this.appSetupService.displayPrecision = +data;
-                break;
-
-            case "cp":
-                this.appSetupService.computePrecision = +data;
-                break;
-
-            case "nmi":
-                this.appSetupService.newtonMaxIterations = +data;
-                break;
+        if (sender instanceof NgBaseParam) {
+            // someone typed a new value in the app-setup form
+            const p: NgBaseParam = sender;
+            switch (p.symbol) {
+                case "dp":
+                    this.appSetupService.displayPrecision = +data;
+                    break;
+
+                case "cp":
+                    this.appSetupService.computePrecision = +data;
+                    break;
+
+                case "nmi":
+                    this.appSetupService.newtonMaxIterations = +data;
+                    break;
+            }
+        }
+        if (sender instanceof ApplicationSetupService) {
+            // if app starts on /setup page, wait for config file to be (re)loaded by app-setup service
+            this.init();
         }
     }
 }

src/app/services/app-setup/app-setup.service.ts

 import { HttpService } from "../http/http.service";
 import { Injectable } from "@angular/core";
+import { Observable } from "jalhyd";
 
 /**
  * Stores app preferences
  */
 @Injectable()
-export class ApplicationSetupService {
+export class ApplicationSetupService extends Observable {
 
     private CONFIG_FILE_PATH = "app/config.json";
 
@@ -19,6 +20,8 @@ export class ApplicationSetupService {
 
     public constructor(
         private httpService: HttpService) {
+
+        super();
         this.readValuesFromConfig();
     }
 
@@ -28,9 +31,7 @@ export class ApplicationSetupService {
 
     // @TODO save preferences in cookie / localStorage ?
 
-    // read default values from config
-    // @TODO notify (?) so that if a user starts the app on the /setup page the values are correct
-    // (atm the default builtin values will be visible until the user changes page and goes back to /setup)
+    // read default values from config and notify observers
     private readValuesFromConfig() {
         this.httpService.httpGetRequestPromise(this.CONFIG_FILE_PATH).then((data: any) => {
             this.displayPrecision = data.params.displayPrecision;
@@ -38,6 +39,8 @@ export class ApplicationSetupService {
             this.newtonMaxIterations = data.params.newtonMaxIterations;
             this.language = data.params.language;
             this.themes = data.themes;
+
+            this.notifyObservers(null);
         });
     }
 }