only listen to share menu when a schema is loaded

Author: rueckstiess

src/home/collection.jade

@@ -5,7 +5,7 @@
       .modal-content
         .modal-header
           button.close(type='button', data-dismiss='modal', aria-label='Close')
-            span(aria-hidden='true')×
+            span(aria-hidden='true') ×
           h4.modal-title Share Schema
         .modal-body
           p The schema definition in JSON format has been copied to the clipboard.

src/home/collection.js

@@ -69,11 +69,21 @@ var MongoDBCollectionView = View.extend({
   initialize: function() {
     this.model = new MongoDBCollection();
     app.statusbar.watch(this, this.schema);
-    debug('app', app);
-    app.on('menu-share-schema-json', this.shareSchemaRequested.bind(this));
+    this.listenTo(this.schema, 'sync', this.schemaIsSynced.bind(this));
+    this.listenTo(this.schema, 'request', this.schemaIsRequested.bind(this));
     this.listenToAndRun(this.parent, 'change:ns', this.onCollectionChanged.bind(this));
   },
-  shareSchemaRequested: function() {
+  schemaIsSynced: function() {
+    // only listen to share menu events if we have a sync'ed schema
+    // @todo enable share menu item here
+    this.listenTo(app, 'menu-share-schema-json', this.onShareSchema.bind(this));
+  },
+  schemaIsRequested: function() {
+    // while a new schema is requested, don't let the user share via the menu option
+    // @todo disable share menu item here
+    this.stopListening(app, 'menu-share-schema-json');
+  },
+  onShareSchema: function() {
     var clipboard = window.require('clipboard');
     clipboard.writeText(JSON.stringify(this.schema.serialize(), null, '  '));
     $(this.queryByHook('share-schema-confirmation')).modal('show');