first commit

libraries/fancybox3/js/wheel.js

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+// ==========================================================================
+//
+// Wheel
+// Basic mouse weheel support for gallery navigation
+//
+// ==========================================================================
+(function (document, $) {
+  "use strict";
+
+  var prevTime = new Date().getTime();
+
+  $(document).on({
+    "onInit.fb": function (e, instance, current) {
+      instance.$refs.stage.on("mousewheel DOMMouseScroll wheel MozMousePixelScroll", function (e) {
+        var current = instance.current,
+          currTime = new Date().getTime();
+
+        if (instance.group.length < 2 || current.opts.wheel === false || (current.opts.wheel === "auto" && current.type !== "image")) {
+          return;
+        }
+
+        e.preventDefault();
+        e.stopPropagation();
+
+        if (current.$slide.hasClass("fancybox-animated")) {
+          return;
+        }
+
+        e = e.originalEvent || e;
+
+        if (currTime - prevTime < 250) {
+          return;
+        }
+
+        prevTime = currTime;
+
+        instance[(-e.deltaY || -e.deltaX || e.wheelDelta || -e.detail) < 0 ? "next" : "previous"]();
+      });
+    }
+  });
+})(document, jQuery);