Support resized event

Author: tangbc

README.md

@@ -159,6 +159,12 @@ More usages or getting start you can refer to these clearly [examples](https://g
       <td>0</td>
       <td>Setting scroll stay offset.</td>
     </tr>
+    <tr>
+      <td><code>scroll</code></td>
+      <td>Function</td>
+      <td></td>
+      <td>Emited when scrolling, param <code>(event, range)</code>.</td>
+    </tr>
     <tr>
       <td><code>totop</code></td>
       <td>Function</td>
@@ -172,10 +178,10 @@ More usages or getting start you can refer to these clearly [examples](https://g
       <td>Emited when scrolled to bottom or right, param <code>(event, range)</code>.</td>
     </tr>
     <tr>
-      <td><code>scroll</code></td>
+      <td><code>resized</code></td>
       <td>Function</td>
       <td></td>
-      <td>Emited when scrolling, param <code>(event, range)</code>.</td>
+      <td>Emited when each item resized (mounted), param <code>(id, size)</code>.</td>
     </tr>
   </table>
 </details>

src/index.js

@@ -160,6 +160,7 @@ const VirtualList = Vue.component('virtual-list', {
     // event called when each item mounted or size changed
     onItemResized (id, size) {
       this.virtual.saveSize(id, size)
+      this.$emit('resized', id, size)
     },
 
     // event called when slot mounted or size changed