feat:add view tag and findViewByTag

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

@@ -41,6 +41,7 @@ export declare abstract class View implements Modeling {
     alpha?: number;
     hidden?: boolean;
     viewId: string;
+    tag?: string;
     padding?: {
         left?: number;
         right?: number;
@@ -53,6 +54,7 @@ export declare abstract class View implements Modeling {
     callbacks: Map<String, Function>;
     private callback2Id;
     private id2Callback;
+    findViewByTag(tag: string): View | undefined;
     constructor();
     /** Anchor start*/
     get left(): number;
@@ -130,6 +132,8 @@ export declare abstract class View implements Modeling {
 }
 export declare abstract class Superview extends View {
     subviewById(id: string): View | undefined;
+    findViewByTag(tag: string): View | undefined;
+    private findViewTraversal;
     abstract allSubviews(): Iterable<View>;
     isDirty(): boolean;
     clean(): void;

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

@@ -54,6 +54,12 @@ export class View {
         }
         return f;
     }
+    findViewByTag(tag) {
+        if (tag === this.tag) {
+            return this;
+        }
+        return undefined;
+    }
     /** Anchor start*/
     get left() {
         return this.x;
@@ -290,6 +296,21 @@ export class Superview extends View {
             }
         }
     }
+    findViewByTag(tag) {
+        if (tag === this.tag) {
+            return this;
+        }
+        return this.findViewTraversal(this, tag);
+    }
+    findViewTraversal(view, tag) {
+        for (let v of view.allSubviews()) {
+            let find = v.findViewByTag(tag);
+            if (find) {
+                return find;
+            }
+        }
+        return undefined;
+    }
     isDirty() {
         if (super.isDirty()) {
             return true;