bring keyboard navigation back to the content screen

refs https://github.com/TryGhost/Ghost/issues/7860
- restores the previous up/down/enter/cmd+backspace functionality
- modifies the `delete-post` modal to accept a hash with an `onSuccess` action

app/components/gh-posts-list-item.js

@@ -14,9 +14,10 @@ const ObjectPromiseProxy = ObjectProxy.extend(PromiseProxyMixin);
 export default Component.extend({
     tagName: 'li',
     classNames: ['gh-posts-list-item'],
+    classNameBindings: ['active'],
 
     post: null,
-    previewIsHidden: false,
+    active: false,
 
     isFeatured: alias('post.featured'),
     isPage: alias('post.page'),
@@ -63,11 +64,40 @@ export default Component.extend({
         return htmlSafe(`${text.slice(0, 80)}…`);
     }),
 
+    didReceiveAttrs() {
+        if (this.get('active')) {
+            this.scrollIntoView();
+        }
+    },
+
     click() {
         this.sendAction('onClick', this.get('post'));
     },
 
     doubleClick() {
         this.sendAction('onDoubleClick', this.get('post'));
+    },
+
+    scrollIntoView() {
+        let element = this.$();
+        let offset = element.offset().top;
+        let elementHeight = element.height();
+        let container = $('.content-list');
+        let containerHeight = container.height();
+        let currentScroll = container.scrollTop();
+        let isBelowTop, isAboveBottom, isOnScreen;
+
+        isAboveBottom = offset < containerHeight;
+        isBelowTop = offset > elementHeight;
+
+        isOnScreen = isBelowTop && isAboveBottom;
+
+        if (!isOnScreen) {
+            // Scroll so that element is centered in container
+            // 40 is the amount of padding on the container
+            container.clearQueue().animate({
+                scrollTop: currentScroll + offset - 40 - containerHeight / 2
+            });
+        }
     }
 });

app/components/modals/delete-post.js

@@ -5,7 +5,8 @@ import {task} from 'ember-concurrency';
 
 export default ModalComponent.extend({
 
-    post: alias('model'),
+    post: alias('model.post'),
+    onSuccess: alias('model.onSuccess'),
 
     notifications: injectService(),
     routing: injectService('-routing'),
@@ -24,8 +25,10 @@ export default ModalComponent.extend({
         // clear any previous error messages
         this.get('notifications').closeAlerts('post.delete');
 
-        // redirect to content screen
-        this.get('routing').transitionTo('posts');
+        // trigger the success action
+        if (this.get('onSuccess')) {
+            this.get('onSuccess')();
+        }
     },
 
     _failure(error) {

app/routes/editor/edit.js

@@ -49,6 +49,10 @@ export default AuthenticatedRoute.extend(base, {
     actions: {
         authorizationFailed() {
             this.get('controller').send('toggleReAuthenticateModal');
+        },
+
+        redirectToContentScreen() {
+            this.transitionTo('posts');
         }
     }
 });

app/routes/posts/index.js

@@ -12,6 +12,7 @@ export default AuthenticatedRoute.extend(InfinityRoute, ShortcutsRoute, {
     totalPagesParam: 'meta.pagination.pages',
 
     _type: null,
+    _selectedPostIndex: null,
 
     model(params) {
         this.set('_type', params.type);
@@ -60,10 +61,18 @@ export default AuthenticatedRoute.extend(InfinityRoute, ShortcutsRoute, {
     }),
 
     stepThroughPosts(step) {
-        let currentPost = this.get('controller.currentPost');
-        let posts = this.get('controller.sortedPosts');
+        let currentPost = this.get('controller.selectedPost');
+        let posts = this.get('controller.model');
         let length = posts.get('length');
-        let newPosition = posts.indexOf(currentPost) + step;
+        let newPosition;
+
+        // when the currentPost is deleted we won't be able to use indexOf.
+        // we keep track of the index locally so we can select next after deletion
+        if (this._selectedPostIndex !== null && length) {
+            newPosition = this._selectedPostIndex + step;
+        } else {
+            newPosition = posts.indexOf(currentPost) + step;
+        }
 
         // if we are on the first or last item
         // just do nothing (desired behavior is to not
@@ -74,20 +83,40 @@ export default AuthenticatedRoute.extend(InfinityRoute, ShortcutsRoute, {
             return;
         }
 
-        // TODO: highlight post
-        // this.transitionTo('posts.post', posts.objectAt(newPosition));
+        this._selectedPostIndex = newPosition;
+        this.set('controller.selectedPost', posts.objectAt(newPosition));
     },
 
     shortcuts: {
         'up, k': 'moveUp',
         'down, j': 'moveDown',
-        c: 'newPost'
+        'enter': 'editPost',
+        'c': 'newPost',
+        'command+backspace, ctrl+backspace': 'deletePost'
+    },
+
+    resetController() {
+        this.set('controller.selectedPost', null);
+        this.set('controller.showDeletePostModal', false);
     },
 
     actions: {
+        willTransition() {
+            this._selectedPostIndex = null;
+
+            if (this.get('controller')) {
+                this.resetController();
+            }
+        },
+
         queryParamsDidChange() {
-            this.refresh();
-            // reset the scroll position
+            // on direct page load controller won't exist so we want to
+            // avoid a double transition
+            if (this.get('controller')) {
+                this.refresh();
+            }
+
+            // scroll back to the top
             $('.content-list').scrollTop(0);
         },
 
@@ -101,6 +130,23 @@ export default AuthenticatedRoute.extend(InfinityRoute, ShortcutsRoute, {
 
         moveDown() {
             this.stepThroughPosts(1);
+        },
+
+        editPost() {
+            let selectedPost = this.get('controller.selectedPost');
+
+            if (selectedPost) {
+                this.transitionTo('editor.edit', selectedPost.get('id'));
+            }
+        },
+
+        deletePost() {
+            this.get('controller').send('toggleDeletePostModal');
+        },
+
+        onPostDeletion() {
+            // select next post (re-select the current index)
+            this.stepThroughPosts(0);
         }
     }
 });

app/templates/editor/edit.hbs

@@ -58,7 +58,7 @@
 
 {{#if showDeletePostModal}}
     {{gh-fullscreen-modal "delete-post"
-                          model=model
+                          model=(hash post=model onSuccess=(route-action 'redirectToContentScreen'))
                           close=(action "toggleDeletePostModal")
                           modifier="action wide"}}
 {{/if}}

app/templates/posts/index.hbs

@@ -3,6 +3,7 @@
         {{#each model as |post|}}
             {{gh-posts-list-item
                 post=post
+                active=(eq post selectedPost)
                 onDoubleClick="openEditor"
                 data-test-posts-list-item-id=post.id}}
         {{else}}
@@ -28,7 +29,10 @@
 
 {{#if showDeletePostModal}}
     {{gh-fullscreen-modal "delete-post"
-                          model=currentPost
+                          model=(hash
+                              post=selectedPost
+                              onSuccess=(route-action 'onPostDeletion')
+                          )
                           close=(action "toggleDeletePostModal")
                           modifier="action wide"}}
 {{/if}}