From 79e08f032dfac30fd663b8a510242eee4795da57 Mon Sep 17 00:00:00 2001
From: Chasen Le Hara <chasen@chasenlehara.com>
Date: Mon, 12 Mar 2018 12:29:57 -0700
Subject: [PATCH] Add helper for listening to jQuery events

This helper can be used when another module registers $.event.special events and you need to listen to those events with can-dom-events.
---
 can-dom-events-test.js            |  1 +
 helpers/add-jquery-events-test.js | 36 +++++++++++++++++
 helpers/add-jquery-events.js      | 65 +++++++++++++++++++++++++++++++
 3 files changed, 102 insertions(+)
 create mode 100644 helpers/add-jquery-events-test.js
 create mode 100644 helpers/add-jquery-events.js

diff --git a/can-dom-events-test.js b/can-dom-events-test.js
index 33a510c..1629b09 100644
--- a/can-dom-events-test.js
+++ b/can-dom-events-test.js
@@ -163,4 +163,5 @@ unit.test('domEvents.addDelegateListener handles document correctly', function (
 require('./helpers/make-event-registry-test');
 require('./helpers/add-event-compat-test');
 require('./helpers/add-event-jquery-test');
+require('./helpers/add-jquery-events-test');
 require('./helpers/util-test');
diff --git a/helpers/add-jquery-events-test.js b/helpers/add-jquery-events-test.js
new file mode 100644
index 0000000..2a6010e
--- /dev/null
+++ b/helpers/add-jquery-events-test.js
@@ -0,0 +1,36 @@
+var unit = require('steal-qunit');
+var $ = require('jquery');
+var addEvents = require('./add-jquery-events');
+var domEvents = require('../can-dom-events');
+
+unit.module('add-jquery-events');
+
+unit.test('should work with the jQuery', function (assert) {
+	assert.expect(1 + 3);
+
+	var divElement = document.createElement('div');
+
+	var eventType = 'draginit';
+	var handler = function (event) {
+		assert.equal(event.target, divElement, 'div should be the target');
+		assert.equal(event.type, eventType, 'event type should match custom event type');
+		assert.equal(event.handleObj.handler, handler, 'callback should be the passed handler');
+	};
+
+	// Set up the special event
+	$.event.special[eventType] = {
+		add: function() {
+			assert.ok(true, 'add handler should be called');
+		}
+	};
+
+	// Bridge can-dom-events + jQuery
+	var removeEvents = addEvents($);
+
+	// Listen to and trigger the event; handler should run
+	domEvents.addEventListener(divElement, eventType, handler);
+	$(divElement).trigger(eventType);
+
+	// Clean up after ourselves :)
+	removeEvents();
+});
diff --git a/helpers/add-jquery-events.js b/helpers/add-jquery-events.js
new file mode 100644
index 0000000..5ebb8b9
--- /dev/null
+++ b/helpers/add-jquery-events.js
@@ -0,0 +1,65 @@
+'use strict';
+
+var domEvents = require('../can-dom-events');
+var namespace = require('can-namespace');
+
+/**
+ * @function can-dom-events/helpers/add-jquery-events ./helpers/add-jquery-events
+ * @parent can-dom-events.helpers
+ * @description Add jQuery’s special events to the global registry.
+ * @signature `addJQueryEvents(jQuery)`
+ * @param {jQuery} jQuery Your instance of jQuery.
+ * @return {function} The callback to remove the jQuery events from the registry.
+ *
+ * @body
+ *
+ * ```js
+ * const $ = require("jquery");
+ * const addJQueryEvents = require("can-dom-events/helpers/add-jquery-events");
+ * const domEvents = require("can-dom-events");
+ * // Require another module that registers itself with jQuery.event.special,
+ * // e.g. jQuery++ registers events such as draginit, dragmove, etc.
+ *
+ * const removeJQueryEvents = addJQueryEvents($);
+ *
+ * // Listen for an event in code; this might also be accomplished through a
+ * // can-stache-binding such as <li on:draginit="listener()">
+ * domEvents.addEventListener(listItemElement, "draginit", function listener() {
+ *   // Will fire after a jQuery draginit event has been fired
+ * });
+ *
+ * // Some other code that fires a jQuery event; this will probably be in the
+ * // package you’re using…
+ * $(listItemElement).trigger("draginit");
+ *
+ * // Later in your code… ready to stop listening for those jQuery events? Call
+ * // the function returned by addJQueryEvents()
+ * removeJQueryEvents();
+ * ```
+ */
+module.exports = namespace.addJQueryEvents = function addJQueryEvents(jQuery) {
+	var jQueryEvents = jQuery.event.special;
+	var removeEvents = [];
+
+	for (var eventType in jQueryEvents) {
+		if (!domEvents._eventRegistry.has(eventType)) {
+			var eventDefinition = {
+				defaultEventType: eventType,
+				addEventListener: function (target, eventType, handler) {
+					$(target).on(eventType, handler);
+				},
+				removeEventListener: function (target, eventType, handler) {
+					$(target).off(eventType, handler);
+				}
+			};
+			var removeEvent = domEvents.addEvent(eventDefinition);
+			removeEvents.push(removeEvent);
+		}
+	}
+
+	return function removeJQueryEvents() {
+		removeEvents.forEach(function(removeEvent) {
+			removeEvent();
+		});
+	};
+};