MOBILE-2938 core: Fix race condition with open page in main menu

src/core/login/providers/helper.ts

@@ -78,6 +78,7 @@ export class CoreLoginHelperProvider {
     protected logger;
     protected isSSOConfirmShown = false;
     protected isOpenEditAlertShown = false;
+    protected pageToLoad: {page: string, params: any, time: number}; // Page to load once main menu is opened.
     waitingForBrowser = false;
 
     constructor(logger: CoreLoggerProvider, private sitesProvider: CoreSitesProvider, private domUtils: CoreDomUtilsProvider,
@@ -87,6 +88,15 @@ export class CoreLoginHelperProvider {
             private initDelegate: CoreInitDelegate, private sitePluginsProvider: CoreSitePluginsProvider,
             private location: Location, private alertCtrl: AlertController, private courseProvider: CoreCourseProvider) {
         this.logger = logger.getInstance('CoreLoginHelper');
+
+        this.eventsProvider.on(CoreEventsProvider.MAIN_MENU_OPEN, () => {
+            /* If there is any page pending to be opened, do it now. Don't open pages stored more than 5 seconds ago, probably
+               the function to open the page was called when it shouldn't. */
+            if (this.pageToLoad && Date.now() - this.pageToLoad.time < 5000) {
+                this.loadPageInMainMenu(this.pageToLoad.page, this.pageToLoad.params);
+                delete this.pageToLoad;
+            }
+        });
     }
 
     /**
@@ -620,6 +630,17 @@ export class CoreLoginHelperProvider {
      * @param {any} params Params to pass to the page.
      */
     protected loadPageInMainMenu(page: string, params: any): void {
+        if (!this.appProvider.isMainMenuOpen()) {
+            // Main menu not open. Store the page to be loaded later.
+            this.pageToLoad = {
+                page: page,
+                params: params,
+                time: Date.now()
+            };
+
+            return;
+        }
+
         if (page == CoreLoginHelperProvider.OPEN_COURSE) {
             // Use the openCourse function.
             this.courseProvider.openCourse(undefined, params.course, params);

src/core/mainmenu/pages/menu/menu.ts

@@ -14,6 +14,7 @@
 
 import { Component, OnDestroy, ViewChild, ChangeDetectorRef } from '@angular/core';
 import { IonicPage, NavController, NavParams } from 'ionic-angular';
+import { CoreAppProvider } from '@providers/app';
 import { CoreSitesProvider } from '@providers/sites';
 import { CoreEventsProvider } from '@providers/events';
 import { CoreIonTabsComponent } from '@components/ion-tabs/ion-tabs';
@@ -43,13 +44,16 @@ export class CoreMainMenuPage implements OnDestroy {
     protected redirectObs: any;
     protected pendingRedirect: any;
     protected urlToOpen: string;
+    protected mainMenuId: number;
 
     @ViewChild('mainTabs') mainTabs: CoreIonTabsComponent;
 
     constructor(private menuDelegate: CoreMainMenuDelegate, private sitesProvider: CoreSitesProvider, navParams: NavParams,
             private navCtrl: NavController, private eventsProvider: CoreEventsProvider, private cdr: ChangeDetectorRef,
             private mainMenuProvider: CoreMainMenuProvider, private linksDelegate: CoreContentLinksDelegate,
-            private linksHelper: CoreContentLinksHelperProvider) {
+            private linksHelper: CoreContentLinksHelperProvider, private appProvider: CoreAppProvider) {
+
+        this.mainMenuId = this.appProvider.getMainMenuId();
 
         // Check if the menu was loaded with a redirect.
         const redirectPage = navParams.get('redirectPage');
@@ -105,6 +109,8 @@ export class CoreMainMenuPage implements OnDestroy {
         });
 
         window.addEventListener('resize', this.initHandlers.bind(this));
+
+        this.appProvider.setMainMenuOpen(this.mainMenuId, true);
     }
 
     /**
@@ -211,5 +217,6 @@ export class CoreMainMenuPage implements OnDestroy {
         this.subscription && this.subscription.unsubscribe();
         this.redirectObs && this.redirectObs.off();
         window.removeEventListener('resize', this.initHandlers.bind(this));
+        this.appProvider.setMainMenuOpen(this.mainMenuId, false);
     }
 }

src/providers/app.ts

@@ -71,9 +71,11 @@ export class CoreAppProvider {
     protected ssoAuthenticationPromise: Promise<any>;
     protected isKeyboardShown = false;
     protected backActions = [];
+    protected mainMenuId = 0;
+    protected mainMenuOpen: number;
 
     constructor(dbProvider: CoreDbProvider, private platform: Platform, private keyboard: Keyboard, private appCtrl: App,
-            private network: Network, logger: CoreLoggerProvider, events: CoreEventsProvider, zone: NgZone,
+            private network: Network, logger: CoreLoggerProvider, private events: CoreEventsProvider, zone: NgZone,
             private menuCtrl: MenuController, private statusBar: StatusBar) {
         this.logger = logger.getInstance('CoreAppProvider');
         this.db = dbProvider.getDB(this.DBNAME);
@@ -138,6 +140,15 @@ export class CoreAppProvider {
         return this.db;
     }
 
+    /**
+     * Get an ID for a main menu.
+     *
+     * @return {number} Main menu ID.
+     */
+    getMainMenuId(): number {
+        return this.mainMenuId++;
+    }
+
     /**
      * Get the app's root NavController.
      *
@@ -213,6 +224,15 @@ export class CoreAppProvider {
         }
     }
 
+    /**
+     * Check if the main menu is open.
+     *
+     * @return {boolean} Whether the main menu is open.
+     */
+    isMainMenuOpen(): boolean {
+        return typeof this.mainMenuOpen != 'undefined';
+    }
+
     /**
      * Checks if the app is running in a mobile or tablet device (Cordova).
      *
@@ -299,6 +319,21 @@ export class CoreAppProvider {
         }
     }
 
+    /**
+     * Set a main menu as open or not.
+     *
+     * @param {number} id Main menu ID.
+     * @param {boolean} open Whether it's open or not.
+     */
+    setMainMenuOpen(id: number, open: boolean): void {
+        if (open) {
+            this.mainMenuOpen = id;
+            this.events.trigger(CoreEventsProvider.MAIN_MENU_OPEN);
+        } else if (this.mainMenuOpen == id) {
+            delete this.mainMenuOpen;
+        }
+    }
+
     /**
      * Start an SSO authentication process.
      * Please notice that this function should be called when the app receives the new token from the browser,

src/providers/events.ts

@@ -59,6 +59,7 @@ export class CoreEventsProvider {
     static ORIENTATION_CHANGE = 'orientation_change';
     static LOAD_PAGE_MAIN_MENU = 'load_page_main_menu';
     static SEND_ON_ENTER_CHANGED = 'send_on_enter_changed';
+    static MAIN_MENU_OPEN = 'main_menu_open';
 
     protected logger;
     protected observables: { [s: string]: Subject<any> } = {};