added scroll and wheel evens

src/event/on.js

@@ -24,6 +24,14 @@ export const change = (param, element, node) => {
   node.addEventListener('change', event => param(event, element, node), true)
 }
 
+export const scroll = (param, element, node) => {
+  node.addEventListener('scroll', event => param(event, element, node), true)
+}
+
+export const wheel = (param, element, node) => {
+  node.addEventListener('wheel', event => param(event, element, node), true)
+}
+
 export const mouseDown = (param, element, node) => {
   node.addEventListener('mousedown', event => param(event, element, node), true)
 }

src/event/wrappers.js

@@ -0,0 +1,14 @@
+'use strict'
+
+export const getScrollPositions = () => {
+  if (window.pageYOffset !== undefined) {
+    return [window.pageXOffset, window.pageYOffset]
+  } else {
+    var d = document
+    var r = d.documentElement
+    var b = d.body
+    var sx = r.scrollLeft || b.scrollLeft || 0
+    var sy = r.scrollTop || b.scrollTop || 0
+    return [sx, sy]
+  }
+}