Refactor post components and controls

js/forum/src/components/post.js

@@ -0,0 +1,31 @@
+import Component from 'flarum/component';
+import SubtreeRetainer from 'flarum/utils/subtree-retainer';
+import DropdownButton from 'flarum/components/dropdown-button';
+
+export default class Post extends Component {
+  constructor(props) {
+    super(props);
+
+    this.subtree = new SubtreeRetainer(
+      () => this.props.post.freshness,
+      () => {
+        var user = this.props.post.user();
+        return user && user.freshness;
+      }
+    );
+  }
+
+  view(content, attrs) {
+    var controls = this.props.post.controls(this).toArray();
+
+    return m('article.post', attrs, this.subtree.retain() || m('div', [
+      controls.length ? DropdownButton.component({
+        items: controls,
+        className: 'contextual-controls',
+        buttonClass: 'btn btn-default btn-icon btn-sm btn-naked',
+        menuClass: 'pull-right'
+      }) : '',
+      content
+    ]));
+  }
+}