Convert preview menu buld to function

Signed-off-by: Justin Georgi <justin.georgi@gmail.com>

modules/glmv-prev.js

@@ -1,3 +1,9 @@
+/**
+ * Use the OOui js library to create wikis-style menu
+ * options on the preview edits page for interaction
+ * with the model
+ */
+buildPreviewMenu = function() {
     let [_, origMetadata] = extractMetadata()
 
     //Annotation Edit Controls
@@ -172,6 +178,7 @@ selectVC.getMenu().on( 'choose', selSet => {
         selectViewConfig(selSet.data)
     })
     selectVC.setDisabled(true)
+    console.log(selectVC)
 
     const cameraButtons = new OO.ui.ButtonGroupWidget({
         items: [ downloadViewerImage, setControl, setView, setLims, selectVC ]
@@ -188,8 +195,27 @@ const modelMenu = new OO.ui.HorizontalLayout({
 
     $('#wikiPreview').after(modelMenu.$element)
 
+    return [modelMenu, selectVC]
+}
+
+/**
+ * Enable all the preview menu widgets (called by
+ * model load event)
+ */
 enableMenu = function() {
     modelMenu.items.forEach(group => {
         group.items.forEach(el => el.setDisabled(false))
     });
 }
+
+/**
+ * Add a selection option to a ButtonMenuSelectWidget
+ * 
+ * @param {ButtonMenuSelectWidget} menuWidget
+ */
+addMenuOption = function(menuWidget) {
+    menuWidget.menu.addItems([new OO.ui.MenuOptionWidget({data: 'New option', label: 'New option'})])
+}
+
+//Initialize the menu and get required global objects
+const [modelMenu, viewSelector] = buildPreviewMenu()