Merge pull request #3403 from turnercode/master

Fixed centering logic when using swipe

Author: kenwheeler

slick/slick.js

@@ -1238,13 +1238,25 @@
     Slick.prototype.getSlideCount = function() {
 
         var _ = this,
-            slidesTraversed, swipedSlide, centerOffset;
+            slidesTraversed, swipedSlide, swipeTarget, centerOffset;
 
-        centerOffset = _.options.centerMode === true ? _.slideWidth * Math.floor(_.options.slidesToShow / 2) : 0;
+        centerOffset = _.options.centerMode === true ? Math.floor(_.$list.width() / 2) : 0;
+        swipeTarget = (_.swipeLeft * -1) + centerOffset;
 
         if (_.options.swipeToSlide === true) {
+
             _.$slideTrack.find('.slick-slide').each(function(index, slide) {
-                if (slide.offsetLeft - centerOffset + ($(slide).outerWidth() / 2) > (_.swipeLeft * -1)) {
+
+                var slideOuterWidth, slideOffset, slideRightBoundary;
+                slideOuterWidth = $(slide).outerWidth();
+                slideOffset = slide.offsetLeft;
+                if (_.options.centerMode !== true) {
+                    slideOffset += (slideOuterWidth / 2);
+                }
+
+                slideRightBoundary = slideOffset + (slideOuterWidth);
+
+                if (swipeTarget < slideRightBoundary) {
                     swipedSlide = slide;
                     return false;
                 }