fix widget class

src/core/widget.ts

@@ -1,10 +1,11 @@
 import QWeb from "./qweb_vdom";
 
-// import {init} from "../libs/snabbdom/src/snabbdom"
-// import sdProps from "../libs/snabbdom/src/modules/props"
-// import sdListeners from "../libs/snabbdom/src/modules/eventlisteners"
+import {init} from "../libs/snabbdom/src/snabbdom"
+import sdProps from "../libs/snabbdom/src/modules/props"
+import sdListeners from "../libs/snabbdom/src/modules/eventlisteners"
+import { VNode } from "../libs/snabbdom/src/vnode";
 
-// const patch = init([sdProps, sdListeners]);
+const patch = init([sdProps, sdListeners]);
 
 export interface Env {
   qweb: QWeb;
@@ -15,11 +16,12 @@ export interface Env {
 export default class Widget {
   name: string = "widget";
   template: string = "<div></div>";
+  vnode: VNode | null = null;
 
   parent: Widget | null;
   children: Widget[] = [];
   env: Env | null = null;
-  el: ChildNode | null = null;
+  el: HTMLElement | null = null;
   state: Object = {};
   refs: { [key: string]: Widget } = {};
 
@@ -53,6 +55,8 @@ export default class Widget {
     this.env!.qweb.addTemplate(this.name, this.template);
     delete this.template;
     await this.render();
+    
+
     target.appendChild(this.el!);
   }
 
@@ -82,10 +86,13 @@ export default class Widget {
   //--------------------------------------------------------------------------
 
   async render() {
-    // const vnode = await this.env!.qweb.render(this.name, this);
-    // patch(this.el, vnode);
-    
-    // this._setElement(fragment.firstChild!);
+    let vnode = await this.env!.qweb.render(this.name, this);
+    if (!this.el) {
+      this.el = document.createElement(vnode.sel!);
+    }
+    patch(this.vnode || this.el, vnode);
+    this.vnode = vnode;
+
   }
 
   // private _setElement(el: ChildNode) {