Create settings-menu-mixin for subview state tracking

Ref #4642
- Move duplicate code from PSM and SettingsTags to a mixin

ghost/admin/controllers/post-settings-menu.js

@@ -1,27 +1,13 @@
 /* global moment */
 import {parseDateString, formatDate} from 'ghost/utils/date-formatting';
+import SettingsMenuMixin from 'ghost/mixins/settings-menu-controller';
 import SlugGenerator from 'ghost/models/slug-generator';
 import boundOneWay from 'ghost/utils/bound-one-way';
 import isNumber from 'ghost/utils/isNumber';
 
-var PostSettingsMenuController = Ember.ObjectController.extend({
-    // State for if the user is viewing a tab's pane.
-    needs: 'application',
-
+var PostSettingsMenuController = Ember.ObjectController.extend(SettingsMenuMixin, {
     lastPromise: null,
 
-    isViewingSubview: Ember.computed('controllers.application.showSettingsMenu', function (key, value) {
-        // Not viewing a subview if we can't even see the PSM
-        if (!this.get('controllers.application.showSettingsMenu')) {
-            return false;
-        }
-        if (arguments.length > 1) {
-            return value;
-        }
-
-        return false;
-    }),
-
     selectedAuthor: null,
     initializeSelectedAuthor: function () {
         var self = this;
@@ -449,14 +435,6 @@ var PostSettingsMenuController = Ember.ObjectController.extend({
             });
         },
 
-        showSubview: function () {
-            this.set('isViewingSubview', true);
-        },
-
-        closeSubview: function () {
-            this.set('isViewingSubview', false);
-        },
-
         resetUploader: function () {
             var uploader = this.get('uploaderReference');
 

ghost/admin/controllers/settings/tags.js

@@ -1,11 +1,10 @@
 import PaginationMixin from 'ghost/mixins/pagination-controller';
+import SettingsMenuMixin from 'ghost/mixins/settings-menu-controller';
 import boundOneWay from 'ghost/utils/bound-one-way';
 
-var TagsController = Ember.ArrayController.extend(PaginationMixin, {
+var TagsController = Ember.ArrayController.extend(PaginationMixin, SettingsMenuMixin, {
     tags: Ember.computed.alias('model'),
 
-    needs: 'application',
-
     activeTag: null,
     activeTagNameScratch: boundOneWay('activeTag.name'),
     activeTagSlugScratch: boundOneWay('activeTag.slug'),
@@ -19,18 +18,6 @@ var TagsController = Ember.ArrayController.extend(PaginationMixin, {
         this._super(options);
     },
 
-    isViewingSubview: Ember.computed('controllers.application.showSettingsMenu', function (key, value) {
-        // Not viewing a subview if we can't even see the PSM
-        if (!this.get('controllers.application.showSettingsMenu')) {
-            return false;
-        }
-        if (arguments.length > 1) {
-            return value;
-        }
-
-        return false;
-    }),
-
     showErrors: function (errors) {
         errors = Ember.isArray(errors) ? errors : [errors];
         this.notifications.showErrors(errors);
@@ -147,14 +134,6 @@ var TagsController = Ember.ArrayController.extend(PaginationMixin, {
             this.saveActiveTagProperty('meta_description', metaDescription);
         },
 
-        showSubview: function () {
-            this.set('isViewingSubview', true);
-        },
-
-        closeSubview: function () {
-            this.set('isViewingSubview', false);
-        },
-
         setCoverImage: function (image) {
             this.saveActiveTagProperty('image', image);
         },

ghost/admin/mixins/settings-menu-controller.js

@@ -0,0 +1,27 @@
+var SettingsMenuControllerMixin = Ember.Mixin.create({
+    needs: 'application',
+
+    isViewingSubview: Ember.computed('controllers.application.showSettingsMenu', function (key, value) {
+        // Not viewing a subview if we can't even see the PSM
+        if (!this.get('controllers.application.showSettingsMenu')) {
+            return false;
+        }
+        if (arguments.length > 1) {
+            return value;
+        }
+
+        return false;
+    }),
+
+    actions: {
+        showSubview: function () {
+            this.set('isViewingSubview', true);
+        },
+
+        closeSubview: function () {
+            this.set('isViewingSubview', false);
+        }
+    }
+});
+
+export default SettingsMenuControllerMixin;