Merge branch 'feature_prevent_swipe' of https://github.com/Calyhre/re…

…veal.js into dev

js/reveal.js

@@ -3954,6 +3954,8 @@
 	 */
 	function onTouchStart( event ) {
 
+		if(preventSwipe(event.target)) return true;
+
 		touch.startX = event.touches[0].clientX;
 		touch.startY = event.touches[0].clientY;
 		touch.startCount = event.touches.length;
@@ -3977,6 +3979,8 @@
 	 */
 	function onTouchMove( event ) {
 
+		if(preventSwipe(event.target)) return true;
+
 		// Each touch should only trigger one action
 		if( !touch.captured ) {
 			onUserInput( event );
@@ -4267,6 +4271,15 @@
 
 	}
 
+	function preventSwipe(target) {
+		while( target && typeof target.hasAttribute === 'function' ) {
+			if(target.hasAttribute('prevent-swipe')) return true;
+			target = target.parentNode;
+		}
+
+		return false;
+	}
+
 
 	// --------------------------------------------------------------------//
 	// ------------------------ PLAYBACK COMPONENT ------------------------//