Replacing studyListContextMenu for dropdown

Packages/ohif-core/client/ui/dropdown/class.js

@@ -0,0 +1,38 @@
+import { Tracker } from 'meteor/tracker';
+import { _ } from 'meteor/underscore';
+import { OHIF } from 'meteor/ohif:core';
+
+class Dropdown {
+    constructor() {
+        this.observer = new Tracker.Dependency();
+        this._items = [];
+        this.observer.changed();
+    }
+
+    clearItems() {
+        this._items = [];
+        this.observer.changed();
+    }
+
+    setItems(items) {
+        this._items = items;
+        this.observer.changed();
+    }
+
+    addItem(item) {
+        this._items.push(item);
+        this.observer.changed();
+    }
+
+    removeItem(item) {
+        this._items = _.without(this._items, item);
+        this.observer.changed();
+    }
+
+    getItems() {
+        this.observer.depend();
+        return this._items;
+    }
+}
+
+OHIF.ui.Dropdown = Dropdown;