feat:fix when call build and onShow at once,then onRenderFinishedCallback maybe called before the render action finished

doric-js/lib/src/ui/panel.d.ts

@@ -13,6 +13,7 @@ export declare abstract class Panel {
     private __root__;
     private headviews;
     private onRenderFinishedCallback;
+    private __rendering__;
     addHeadView(type: string, v: View): void;
     allHeadViews(): IterableIterator<Map<string, View>>;
     removeHeadView(type: string, v: View | string): void;

doric-js/lib/src/ui/panel.js

@@ -38,6 +38,7 @@ export class Panel {
         this.__root__ = new Root;
         this.headviews = new Map;
         this.onRenderFinishedCallback = [];
+        this.__rendering__ = false;
     }
     onCreate() { }
     onDestroy() { }
@@ -187,9 +188,18 @@ export class Panel {
                 }
             });
         }
-        Promise.all(promises).then(_ => {
-            this.onRenderFinished();
-        });
+        if (this.__rendering__) {
+            //skip
+            Promise.all(promises).then(_ => {
+            });
+        }
+        else {
+            this.__rendering__ = true;
+            Promise.all(promises).then(_ => {
+                this.__rendering__ = false;
+                this.onRenderFinished();
+            });
+        }
     }
     onRenderFinished() {
         this.onRenderFinishedCallback.forEach(e => {