From d489ec2f9ddddb9e502c3cccbfe277f84c22963b Mon Sep 17 00:00:00 2001
From: hakimel
Date: Mon, 21 Jan 2013 12:45:52 -0500
Subject: add overviewshown and overviewhidden events (closes #298)

---
 js/reveal.js | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

(limited to 'js/reveal.js')

diff --git a/js/reveal.js b/js/reveal.js
index 93b14f7..b3d1d7f 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -622,14 +622,16 @@ var Reveal = (function(){
 		// Only proceed if enabled in config
 		if( config.overview ) {
 
+			var wasActive = dom.wrapper.classList.contains( 'overview' );
+
 			dom.wrapper.classList.add( 'overview' );
 			dom.wrapper.classList.remove( 'exit-overview' );
 
 			clearTimeout( activateOverviewTimeout );
 			clearTimeout( deactivateOverviewTimeout );
 
-			// Not the pretties solution, but need to let the overview 
-			// class apply first so that slides are measured accurately 
+			// Not the pretties solution, but need to let the overview
+			// class apply first so that slides are measured accurately
 			// before we can position them
 			activateOverviewTimeout = setTimeout( function(){
 
@@ -681,6 +683,15 @@ var Reveal = (function(){
 
 				layout();
 
+				if( !wasActive ) {
+					// Notify observers of the overview showing
+					dispatchEvent( 'overviewshown', {
+						'indexh': indexh,
+						'indexv': indexv,
+						'currentSlide': currentSlide
+					} );
+				}
+
 			}, 10 );
 
 		}
@@ -730,6 +741,13 @@ var Reveal = (function(){
 
 			slide( indexh, indexv );
 
+			// Notify observers of the overview hiding
+			dispatchEvent( 'overviewhidden', {
+				'indexh': indexh,
+				'indexv': indexv,
+				'currentSlide': currentSlide
+			} );
+
 		}
 	}
 
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