feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/workflow/fabric-canvas/src/hooks/use-schema-change.tsx

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+import { useEffect, useState } from 'react';
+
+import { type Canvas, type FabricObject } from 'fabric';
+
+import { setElementAfterLoad } from '../utils';
+import { type FabricSchema } from '../typings';
+
+/**
+ * 监听 schema 变化，reload canvas
+ * 仅只读态需要
+ */
+export const useSchemaChange = ({
+  canvas,
+  schema,
+  readonly,
+}: {
+  canvas: Canvas | undefined;
+  schema: FabricSchema;
+  readonly: boolean;
+}) => {
+  const [loading, setLoading] = useState(false);
+  useEffect(() => {
+    setLoading(true);
+    canvas
+      ?.loadFromJSON(JSON.stringify(schema), (elementSchema, element) => {
+        // 这里是 schema 中每个元素被加载后的回调
+        setElementAfterLoad({
+          element: element as FabricObject,
+          options: { readonly },
+          canvas,
+        });
+      })
+      .then(() => {
+        setLoading(false);
+        canvas?.requestRenderAll();
+      });
+  }, [schema, canvas]);
+
+  return {
+    loading,
+  };
+};