feat: support canvas universal api

packages/canvas/README-zh_CN.md

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+# universal-canvas [![npm](https://img.shields.io/npm/v/universal-canvas.svg)](https://www.npmjs.com/package/universal-canvas)
+
+一个适配多端的 canvas api。
+
+## 支持
+
+**icon_miniapp_mp** **icon_miniapp_wx** **icon_web**
+
+## 安装
+
+```bash
+$ npm install universal-canvas --save
+```
+
+## 使用
+
+```js
+import { createElement, useEffect, Fragment } from 'rax';
+import { createContext } from 'universal-canvas';
+
+function App() {
+  useEffect({
+    createContext('canvas', '2d').then(context => {
+      context.fillStyle = 'red';
+      context.fillRect(0, 0, 100, 100);
+      context.draw();
+    });
+  }, []);
+
+  return (<>
+    <canvas id='canvas'></canvas>
+  </>)
+}
+```
+
+## 方法
+
+### `createContext(canvasId, type, options)`
+
+只有在阿里系小程序中，返回的 `context` 中才含有有实际作用的 `draw` 方法。
+
+```js
+createContext("canvas").then((context) => {
+  context.fillStyle = 'red';
+  context.fillRect(0, 0, 100, 100);
+  // 在除了阿里小程序的其它容器中，draw 方法是一个空函数
+	context.draw();
+});
+```

packages/canvas/README.md

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+# universal-canvas [![npm](https://img.shields.io/npm/v/universal-canvas.svg)](https://www.npmjs.com/package/universal-canvas)
+
+Universal canvas api.
+
+## Support
+
+**icon_miniapp_mp** **icon_miniapp_wx** **icon_web**
+
+## Install
+
+```bash
+$ npm install universal-canvas --save
+```
+
+## Usage
+
+```js
+import { createElement, useEffect, Fragment } from 'rax';
+import { createContext } from 'universal-canvas';
+
+function App() {
+  useEffect({
+    createContext('canvas', '2d').then(context => {
+      context.fillStyle = 'red';
+      context.fillRect(0, 0, 100, 100);
+      context.draw();
+    });
+  }, []);
+
+  return (<>
+    <canvas id='canvas'></canvas>
+  </>)
+}
+```
+
+## Methods
+
+### `createContext(canvasId, type, options)`
+
+Only in MiniApp, the return `context` has valid `draw` method.
+
+```js
+createContext("canvas").then((context) => {
+  context.fillStyle = 'red';
+  context.fillRect(0, 0, 100, 100);
+  // Only in alibaba miniapp, draw isn't an empty function
+	context.draw();
+});
+```

packages/canvas/build.json

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+{
+  "plugins": [
+    [
+      "build-plugin-rax-component",
+      {
+        "type": "rax",
+        "targets": ["web"]
+      }
+    ]
+  ]
+}

packages/canvas/demo/index.js

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+import { createElement, useEffect, render } from 'rax';
+import UniversalDriver from 'driver-universal';
+import View from 'rax-view';
+import { createContext } from '../src/index';
+
+function App() {
+  useEffect(() => {
+    createContext('canvas', '2d').then((canvasContext) => {
+      canvasContext.fillStyle = 'red';
+      canvasContext.fillRect(0, 0, 100, 100);
+      // Only valid in miniapp
+      canvasContext.draw();
+    });
+  }, []);
+  return (
+    <View>
+      <canvas id="canvas" width="400" height="400" />
+    </View>
+  );
+}
+
+render(<App />, document.body, { driver: UniversalDriver });

packages/canvas/docs-template/README-zh_CN.md

@@ -0,0 +1,49 @@
+# universal-canvas [![npm](https://img.shields.io/npm/v/universal-canvas.svg)](https://www.npmjs.com/package/universal-canvas)
+
+一个适配多端的 canvas api。
+
+## 支持
+
+**icon_miniapp_mp** **icon_miniapp_wx** **icon_web**
+
+## 安装
+
+```bash
+$ npm install universal-canvas --save
+```
+
+## 使用
+
+```js
+import { createElement, useEffect, Fragment } from 'rax';
+import { createContext } from 'universal-canvas';
+
+function App() {
+  useEffect({
+    createContext('canvas', '2d').then(context => {
+      context.fillStyle = 'red';
+      context.fillRect(0, 0, 100, 100);
+      context.draw();
+    });
+  }, []);
+
+  return (<>
+    <canvas id='canvas'></canvas>
+  </>)
+}
+```
+
+## 方法
+
+### `createContext(canvasId, type, options)`
+
+只有在阿里系小程序中，返回的 `context` 中才含有有实际作用的 `draw` 方法。
+
+```js
+createContext("canvas").then((context) => {
+  context.fillStyle = 'red';
+  context.fillRect(0, 0, 100, 100);
+  // 在除了阿里小程序的其它容器中，draw 方法是一个空函数
+	context.draw();
+});
+```

packages/canvas/docs-template/README.md

@@ -0,0 +1,49 @@
+# universal-canvas [![npm](https://img.shields.io/npm/v/universal-canvas.svg)](https://www.npmjs.com/package/universal-canvas)
+
+Universal canvas api.
+
+## Support
+
+**icon_miniapp_mp** **icon_miniapp_wx** **icon_web**
+
+## Install
+
+```bash
+$ npm install universal-canvas --save
+```
+
+## Usage
+
+```js
+import { createElement, useEffect, Fragment } from 'rax';
+import { createContext } from 'universal-canvas';
+
+function App() {
+  useEffect({
+    createContext('canvas', '2d').then(context => {
+      context.fillStyle = 'red';
+      context.fillRect(0, 0, 100, 100);
+      context.draw();
+    });
+  }, []);
+
+  return (<>
+    <canvas id='canvas'></canvas>
+  </>)
+}
+```
+
+## Methods
+
+### `createContext(canvasId, type, options)`
+
+Only in MiniApp, the return `context` has valid `draw` method.
+
+```js
+createContext("canvas").then((context) => {
+  context.fillStyle = 'red';
+  context.fillRect(0, 0, 100, 100);
+  // Only in alibaba miniapp, draw isn't an empty function
+	context.draw();
+});
+```

packages/canvas/package.json

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+{
+  "name": "universal-canvas",
+  "author": "Rax Team",
+  "version": "1.0.0",
+  "description": "Universal canvas api",
+  "main": "lib/index.js",
+  "files": [
+    "src",
+    "lib",
+    "dist"
+  ],
+  "scripts": {
+    "start": "build-scripts start",
+    "build": "build-scripts build"
+  },
+  "pre-commit": ["lint"],
+  "keywords": [
+    "Rax",
+    "canvas"
+  ],
+  "engines": {
+    "npm": ">=3.0.0"
+  },
+  "devDependencies": {
+    "typescript": "^3.7.5",
+    "driver-universal": "^3.0.0",
+    "rax": "^1.1.0",
+    "rax-text": "^1.0.1",
+    "rax-view": "^1.0.2",
+    "build-plugin-rax-component": "^0.2.0",
+    "@alib/build-scripts": "^0.1.0"
+  }
+}

packages/canvas/src/ali-miniapp/index.ts

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+import { CanvasContext } from '../types'
+
+declare const my: any;
+
+function createContext(selector: string): Promise<CanvasContext> {
+  return new Promise((resolve) => {
+    const context = my.createCanvasContext(selector);
+    Object.defineProperty(context, 'fillStyle', {
+      get() {
+        return context.setFillStyle;
+      },
+      set(value) {
+        context.setFillStyle(value);
+      },
+    });
+    resolve(context);
+  });
+}
+
+export default {
+  createContext,
+};

packages/canvas/src/index.ts

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+// eslint-disable-next-line import/no-extraneous-dependencies
+import { isWeb, isMiniApp, isWeChatMiniProgram } from 'universal-env';
+import aliMiniApp from './ali-miniapp';
+import wechatMiniProgram from './wechat-miniprogram';
+import web from './web';
+import { Canvas } from './types';
+
+let canvas: Canvas;
+
+if (isMiniApp && !isWeb) {
+  // For cased that import wechat or miniapp sdk in web
+  canvas = aliMiniApp;
+} else if (isWeChatMiniProgram && !isWeb) {
+  canvas = wechatMiniProgram;
+} else {
+  // Web as default
+  canvas = web;
+}
+
+const createContext = canvas.createContext;
+
+export {
+  createContext
+};

packages/canvas/src/types.ts

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+export type CanvasContext = { draw?: () => void } & RenderingContext;
+export interface Canvas {
+  createContext: (
+    selector: string,
+    type: string,
+    options: object
+  ) => Promise<CanvasContext>;
+}
+
+export interface ContextAttributes {
+  antialias?: boolean,
+  depth?: boolean,
+  alpha?: boolean,
+  willReadFrequently?: boolean,
+  storage?: string,
+  failIfMajorPerformanceCaveat?: boolean,
+  powerPreference?: string,
+  premultipliedAlpha?: string,
+  preserveDrawingBuffer?: string,
+  stencil?: string
+}

packages/canvas/src/web/index.ts

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+import { CanvasContext, ContextAttributes } from '../types'
+
+function createContext(
+  selector: string,
+  type: string = '2d',
+  options: ContextAttributes = {}
+): Promise<CanvasContext> {
+  return new Promise((resolve, reject) => {
+    const canvasNode: HTMLCanvasElement = document.getElementById(
+      selector
+    ) as HTMLCanvasElement;
+    if (!canvasNode) reject('The canvas node may not exist.');
+    const context :CanvasContext = canvasNode.getContext(type, options);
+    // For fallback
+    context.draw = function() {};
+    resolve(context);
+  });
+}
+
+export default {
+  createContext,
+};

packages/canvas/src/wechat-miniprogram/index.ts

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+import { CanvasContext, ContextAttributes } from '../types'
+
+declare const wx: any;
+
+function createContext(
+  selector: string,
+  type: string = '2d',
+  options: ContextAttributes = {}
+): Promise<CanvasContext> {
+  return new Promise((resolve, reject) => {
+    const query = wx.createSelectorQuery();
+    query
+      .select(`#${selector}`)
+      .fields({ node: true, size: true })
+      .exec((res) => {
+        if (!res[0] || !res[0].node) reject('The canvas node may not exist.');
+        const canvasNode :HTMLCanvasElement = res[0].node;
+        const context :CanvasContext = canvasNode.getContext(type, options);
+        // For fallback
+        context.draw = function() {};
+        resolve(context);
+      });
+  });
+}
+
+export default {
+  createContext,
+};