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venv/Lib/site-packages/notebook/static/base/js/events.js

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+// Copyright (c) Jupyter Development Team.
+// Distributed under the terms of the Modified BSD License.
+
+// Give us an object to bind all events to. This object should be created
+// before all other objects so it exists when others register event handlers.
+// To register an event handler:
+//
+// requirejs(['base/js/events'], function (events) {
+//     events.on("event.Namespace", function () { do_stuff(); });
+// });
+
+define(['jquery', 'base/js/namespace'], function($, Jupyter) {
+    "use strict";
+    
+    // Events singleton
+    if (!window._Events) {
+        window._Events = function () {};
+        window._events = new window._Events();
+    }
+    
+    // Backwards compatibility.
+    Jupyter.Events = window._Events;
+    Jupyter.events = window._events;
+    
+    var events = $([window._events]);
+
+    // catch and log errors in triggered events
+    events._original_trigger = events.trigger;
+    events.trigger = function (name, data) {
+        try {
+            this._original_trigger.apply(this, arguments);
+        } catch (e) {
+            console.error("Exception in event handler for " + name, e, arguments);
+        }
+    }
+    return events;
+});