(Navigation) Improved navigation service for easier navigation management

src/@fuse/components/navigation/navigation.service.ts

@@ -1,25 +1,139 @@
 import { Injectable } from '@angular/core';
-import { Subject } from 'rxjs';
+import { BehaviorSubject, Observable, Subject } from 'rxjs';
 
 @Injectable()
 export class FuseNavigationService
 {
     flatNavigation: any[] = [];
 
-    onItemCollapsed: Subject<any> = new Subject;
-    onItemCollapseToggled: Subject<any> = new Subject;
+    onItemCollapsed: Subject<any>;
+    onItemCollapseToggled: Subject<any>;
+
+    // Private
+    private _onNavigationChanged: BehaviorSubject<any>;
+    private _onNavigationRegistered: BehaviorSubject<any>;
+    private _onNavigationUnregistered: BehaviorSubject<any>;
+
+    private _currentNavigationKey: string;
+    private _registry: { [key: string]: any } = {};
 
     /**
      * Constructor
      */
     constructor()
     {
+        // Set the defaults
+        this.onItemCollapsed = new Subject();
+        this.onItemCollapseToggled = new Subject();
+
+        // Set the private defaults
+        this._currentNavigationKey = null;
+        this._onNavigationChanged = new BehaviorSubject(null);
+        this._onNavigationRegistered = new BehaviorSubject(null);
+        this._onNavigationUnregistered = new BehaviorSubject(null);
+    }
+
+    // -----------------------------------------------------------------------------------------------------
+    // @ Accessors
+    // -----------------------------------------------------------------------------------------------------
+
+    /**
+     * Get onNavigationChanged
+     *
+     * @returns {Observable<any>}
+     */
+    get onNavigationChanged(): Observable<any>
+    {
+        return this._onNavigationChanged.asObservable();
+    }
+
+    /**
+     * Get onNavigationRegistered
+     *
+     * @returns {Observable<any>}
+     */
+    get onNavigationRegistered(): Observable<any>
+    {
+        return this._onNavigationRegistered.asObservable();
+    }
+
+    /**
+     * Get onNavigationUnregistered
+     *
+     * @returns {Observable<any>}
+     */
+    get onNavigationUnregistered(): Observable<any>
+    {
+        return this._onNavigationUnregistered.asObservable();
     }
 
     // -----------------------------------------------------------------------------------------------------
     // @ Public methods
     // -----------------------------------------------------------------------------------------------------
 
+    /**
+     * Register the given navigation
+     * with the given key
+     *
+     * @param key
+     * @param navigation
+     */
+    register(key, navigation): void
+    {
+        // Check if the key already being used
+        if ( this._registry[key] )
+        {
+            console.error(`The navigation with the key '${key}' already exists. Either unregister it first or use a unique key.`);
+
+            return;
+        }
+
+        // Add to the registry
+        this._registry[key] = navigation;
+
+        // Notify the subject
+        this._onNavigationRegistered.next([key, navigation]);
+    }
+
+    /**
+     * Unregister the navigation from the registry
+     * @param key
+     */
+    unregister(key): void
+    {
+        // Check if the navigation exists
+        if ( !this._registry[key] )
+        {
+            console.warn(`The navigation with the key '${key}' doesn't exist in the registry.`);
+        }
+
+        // Unregister the sidebar
+        delete this._registry[key];
+
+        // Notify the subject
+        this._onNavigationUnregistered.next(key);
+    }
+
+    /**
+     * Get navigation from registry by key
+     *
+     * @param key
+     * @returns {any}
+     */
+    getNavigation(key): any
+    {
+        // Check if the navigation exists
+        if ( !this._registry[key] )
+        {
+            console.warn(`The navigation with the key '${key}' doesn't exist in the registry.`);
+
+            return;
+        }
+
+        // Return the sidebar
+        return this._registry[key];
+    }
+
     /**
      * Get flattened navigation array
      *
@@ -33,10 +147,15 @@ export class FuseNavigationService
             if ( navItem.type === 'item' )
             {
                 this.flatNavigation.push({
-                    title: navItem.title,
-                    type : navItem.type,
-                    icon : navItem.icon || false,
-                    url  : navItem.url
+                    id        : navItem.id || null,
+                    title     : navItem.title || null,
+                    translate : navItem.translate || null,
+                    type      : navItem.type,
+                    icon      : navItem.icon || null,
+                    url       : navItem.url || null,
+                    function  : navItem.function || null,
+                    exactMatch: navItem.exactMatch || false,
+                    badge     : navItem.badge || null
                 });
 
                 continue;
@@ -53,4 +172,117 @@ export class FuseNavigationService
 
         return this.flatNavigation;
     }
+
+    /**
+     * Get the current navigation
+     *
+     * @returns {any}
+     */
+    getCurrentNavigation(): any
+    {
+        if ( !this._currentNavigationKey )
+        {
+            console.warn(`The current navigation is not set.`);
+
+            return;
+        }
+
+        return this.getNavigation(this._currentNavigationKey);
+    }
+
+    /**
+     * Set the navigation with the key
+     * as the current navigation
+     *
+     * @param key
+     */
+    setCurrentNavigation(key): void
+    {
+        // Check if the sidebar exists
+        if ( !this._registry[key] )
+        {
+            console.warn(`The navigation with the key '${key}' doesn't exist in the registry.`);
+
+            return;
+        }
+
+        // Set the current navigation key
+        this._currentNavigationKey = key;
+
+        // Notify the subject
+        this._onNavigationChanged.next(key);
+    }
+
+    /**
+     * Get navigation item by id from the
+     * current navigation
+     *
+     * @param id
+     * @param {any} navigation
+     * @returns {any | boolean}
+     */
+    getNavigationItem(id, navigation = null): any | boolean
+    {
+        if ( !navigation )
+        {
+            navigation = this.getCurrentNavigation();
+        }
+
+        for ( const item of navigation )
+        {
+            if ( item.id === id )
+            {
+                return item;
+            }
+
+            if ( item.children )
+            {
+                this.getNavigationItem(id, item.children);
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Add a navigation item to the specified location
+     *
+     * @param item
+     * @param id
+     */
+    addNavigationItem(item, id): void
+    {
+        // Get the current navigation
+        const navigation: any[] = this.getCurrentNavigation();
+
+        // Add to the end of the navigation
+        if ( id === 'end' )
+        {
+            navigation.push(item);
+
+            return;
+        }
+
+        // Add to the start of the navigation
+        if ( id === 'start' )
+        {
+            navigation.unshift(item);
+        }
+
+        // Add it to a specific location
+        const parent: any = this.getNavigationItem(id);
+
+        if ( parent )
+        {
+            // Check if parent has a children entry,
+            // and add it if it doesn't
+            if ( !parent.children )
+            {
+                parent.children = [];
+            }
+
+            // Add the item
+            parent.children.push(item);
+        }
+    }
 }