use proxy to intercept view's property

js-framework/index.ts

@@ -12,6 +12,6 @@ v.config = {
 }
 console.log(v.toModel())
 
-const layout = new Text
-
+const layout = new VLayout
+layout.space = 10
 console.log(layout.toModel())

js-framework/package-lock.json

@@ -1,5 +1,13 @@
 {
   "name": "hego-jsframework",
   "version": "0.1.0",
-  "lockfileVersion": 1
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "reflect-metadata": {
+      "version": "0.1.13",
+      "resolved": "https://registry.npmjs.org/reflect-metadata/-/reflect-metadata-0.1.13.tgz",
+      "integrity": "sha512-Ts1Y/anZELhSsjMcU605fU9RE4Oi3p5ORujwbIKXfWa+0Zxs510Qrmrce5/Jowq3cHSZSJqBjypxmHarc+vEWg=="
+    }
+  }
 }

js-framework/package.json

@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "dev": "tsc -p .&& node ../build/index.js"
+    "dev": "tsc -p .&& node ./build/index.js"
   },
   "repository": {
     "type": "git",
@@ -16,5 +16,8 @@
   "bugs": {
     "url": "https://github.com/penfeizhou/hego/issues"
   },
-  "homepage": "https://github.com/penfeizhou/hego#readme"
+  "homepage": "https://github.com/penfeizhou/hego#readme",
+  "dependencies": {
+    "reflect-metadata": "^0.1.13"
+  }
 }

js-framework/tsconfig.json

@@ -13,7 +13,7 @@
     // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
     // "sourceMap": true,                     /* Generates corresponding '.map' file. */
     // "outFile": "./",                       /* Concatenate and emit output to single file. */
-    "outDir": "../build/", /* Redirect output structure to the directory. */
+    "outDir": "build/", /* Redirect output structure to the directory. */
     // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
     // "composite": true,                     /* Enable project compilation */
     // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */

js-framework/util/types.ts

@@ -1,24 +1,3 @@
-export interface IWatcher {
-    onPropertyChanged(propKey: string, oldV: any, newV: any): void
-}
-
-
-export function Property(target: IWatcher, propKey: string) {
-    const key = Symbol(propKey)
-    Reflect.defineProperty(target, propKey, {
-        configurable: false,
-        enumerable: true,
-        get: () => {
-            return Reflect.get(target, key)
-        },
-        set: (v: any) => {
-            const oldV = Reflect.get(target, key)
-            Reflect.set(target, key, v)
-            target.onPropertyChanged(propKey, oldV, v)
-        }
-    })
-}
-
 export interface Modeling {
     toModel(): Model
 }

js-framework/view/view.ts

@@ -1,8 +1,12 @@
 import { Color, GradientColor } from "../util/color"
-import { Property, IWatcher, Modeling, Model } from "../util/types";
+import { Modeling, Model } from "../util/types";
+import "reflect-metadata"
 
+export function Property(target: Object, propKey: string) {
+    Reflect.defineMetadata(propKey, true, target)
+}
 
-export abstract class View implements IWatcher, Modeling {
+export abstract class View implements Modeling {
     @Property
     width: number = 0
 
@@ -29,7 +33,21 @@ export abstract class View implements IWatcher, Modeling {
 
     @Property
     alpha?: number
-
+    constructor() {
+        return new Proxy(this, {
+            get: (target, p) => {
+                return Reflect.get(target, p)
+            },
+            set: (target, p, v) => {
+                const oldV = Reflect.get(target, p)
+                const ret = Reflect.set(target, p, v)
+                if (Reflect.getMetadata(p, target)) {
+                    this.onPropertyChanged(p.toString(), oldV, v)
+                }
+                return ret
+            }
+        })
+    }
     /** Anchor start*/
     get left() {
         return this.x
@@ -62,13 +80,9 @@ export abstract class View implements IWatcher, Modeling {
     }
     /** Anchor end*/
 
-    __dirty_props__?: { [index: string]: Model | undefined }
+    __dirty_props__: { [index: string]: Model | undefined } = {}
 
     onPropertyChanged(propKey: string, oldV: Model, newV: Model): void {
-        //console.log(`onPropertyChanged:${propKey},old value is ${oldV},new value is ${newV}`)
-        if (this.__dirty_props__ === undefined) {
-            this.__dirty_props__ = {}
-        }
         if (newV instanceof Object
             && Reflect.has(newV, 'toModel')
             && Reflect.get(newV, 'toModel') instanceof Function) {