[adapters] 增加小游戏适配部分源码

adapters/platforms/baidu/wrapper/builtin/Canvas.js

@@ -0,0 +1,48 @@
+/* eslint-disable */
+import * as Mixin from './util/mixin'
+// import HTMLCanvasElement from './HTMLCanvasElement'
+
+// TODO
+let hasModifiedCanvasPrototype = false
+let hasInit2DContextConstructor = false
+let hasInitWebGLContextConstructor = false
+
+export default function Canvas() {
+    const canvas = swan.createCanvas()
+
+    const _getContext = canvas.getContext;
+
+    // canvas.__proto__.__proto__.__proto__ = new HTMLCanvasElement()
+
+    if (!('tagName' in canvas)) {
+        canvas.tagName = 'CANVAS'
+    }
+
+    canvas.type = 'canvas'
+
+    Mixin.parentNode(canvas);
+    Mixin.style(canvas);
+    Mixin.classList(canvas);
+    Mixin.clientRegion(canvas);
+    Mixin.offsetRegion(canvas);
+
+    canvas.focus = function() {};
+    canvas.blur = function() {};
+
+    canvas.addEventListener = function(type, listener, options = {}) {
+        // console.log('canvas.addEventListener', type);
+        document.addEventListener(type, listener, options);
+    }
+
+    canvas.removeEventListener = function(type, listener) {
+        // console.log('canvas.removeEventListener', type);
+        document.removeEventListener(type, listener);
+    }
+
+    canvas.dispatchEvent = function(event = {}) {
+        console.log('canvas.dispatchEvent', event.type, event);
+        // nothing to do
+    }
+
+    return canvas
+}