From 48fa4b4a5e89a901b234959e3daa986294a54c05 Mon Sep 17 00:00:00 2001
From: Don Mitchell <dmitchell@edx.org>
Date: Tue, 22 Jan 2013 09:49:12 -0500
Subject: [PATCH] Cache in order to try updated sortable lib

---
 cms/static/js/hesitate.js | 50 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 cms/static/js/hesitate.js

diff --git a/cms/static/js/hesitate.js b/cms/static/js/hesitate.js
new file mode 100644
index 0000000000..06107f3f4e
--- /dev/null
+++ b/cms/static/js/hesitate.js
@@ -0,0 +1,50 @@
+/*
+ * Create a HesitateEvent and assign it as the event to execute:
+ *   $(el).on('mouseEnter', CMS.HesitateEvent( expand, 'mouseLeave').trigger);
+ *   It calls the executeOnTimeOut function with the event.currentTarget after the configurable timeout IFF the cancelSelector event
+ *   did not occur on the event.currentTarget. 
+ *   
+ *   More specifically, when trigger is called (triggered by the event you bound it to), it starts a timer 
+ *   which the cancelSelector event will cancel or if the timer finished, it executes the executeOnTimeOut function
+ *   passing it the original event (whose currentTarget s/b the specific ele). It never accumulates events; however, it doesn't hurt for your
+ *   code to minimize invocations of trigger by binding to mouseEnter v mouseOver and such.
+ *   
+ *   NOTE: if something outside of this wants to cancel the event, invoke cachedhesitation.untrigger(null | anything);
+ */
+
+CMS.HesitateEvent = function(executeOnTimeOut, cancelSelector, onlyOnce = false) {
+	this.executeOnTimeOut = executeOnTimeOut;
+	this.cancelSelector = cancelSelector;
+	this.timeoutEventId = null;
+	this.originalEvent = null;
+	this.onlyOnce = onlyOnce;
+}
+
+CMS.HesitateEvent.DURATION = 400;
+
+CMS.HesitateEvent.prototype.trigger = function(event) {
+console.log('trigger');
+	if (this.timeoutEventId === null) {
+		this.timeoutEventId = window.setTimeout(this.fireEvent, CMS.HesitateEvent.DURATION);
+		this.originalEvent = event;
+		// is it wrong to bind to the below v $(event.currentTarget)?
+		$(this.originalEvent.delegateTarget).on(this.cancelSelector, this.untrigger);
+	}
+}
+
+CMS.HesitateEvent.prototype.fireEvent = function(event) {
+console.log('fire');
+	this.timeoutEventId = null;
+	$(this.originalEvent.delegateTarget).off(this.cancelSelector, this.untrigger);
+	if (this.onlyOnce) $(this.originalEvent.delegateTarget).off(this.originalEvent.type, this.trigger);
+	this.executeOnTimeOut(this.originalEvent);
+}
+
+CMS.HesitateEvent.prototype.untrigger = function(event) {
+console.log('untrigger');
+	if (this.timeoutEventId) {
+		window.clearTimeout(this.timeoutEventId);
+		$(this.originalEvent.delegateTarget).off(this.cancelSelector, this.untrigger);
+	}
+	this.timeoutEventId = null;
+}
\ No newline at end of file