Pass source index to item

Author: tangbc

src/index.js

@@ -221,6 +221,7 @@ const VirtualList = Vue.component('virtual-list', {
             slots.push(h(Item, {
               class: itemClass,
               props: {
+                index,
                 tag: itemTag,
                 event: EVENT_TYPE.ITEM,
                 horizontal: isHorizontal,

src/item.js

@@ -55,8 +55,9 @@ export const Item = Vue.component('virtual-list-item', {
   props: ItemProps,
 
   render (h) {
-    const { tag, component, extraProps = {} } = this
+    const { tag, component, extraProps = {}, index } = this
     extraProps.source = this.source
+    extraProps.index = index
 
     return h(tag, {
       role: 'item'

src/props.js

@@ -95,6 +95,9 @@ export const VirtualProps = {
 }
 
 export const ItemProps = {
+  index: {
+    type: Number
+  },
   event: {
     type: String
   },