feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

frontend/packages/workflow/playground/src/utils/create-slots/index.tsx

@@ -0,0 +1,126 @@
+/*
+ * 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 React, { useLayoutEffect } from 'react';
+
+import { useForceUpdate } from './use-force-update';
+
+/** createSlots is a factory that can create a
+ *  typesafe Slots + Slot pair to use in a component definition
+ *  For example: ActionList.Item uses createSlots to get a Slots wrapper
+ *  + Slot component that is used by LeadingVisual, Description
+ */
+const createSlots = <SlotNames extends string>(slotNames: SlotNames[]) => {
+  type Slots = {
+    [key in SlotNames]?: React.ReactNode;
+  };
+
+  interface ContextProps {
+    registerSlot: (name: SlotNames, contents: React.ReactNode) => void;
+    unregisterSlot: (name: SlotNames) => void;
+    context: Record<string, unknown>;
+  }
+  const SlotsContext = React.createContext<ContextProps>({
+    registerSlot: () => null,
+    unregisterSlot: () => null,
+    context: {},
+  });
+
+  // maintain a static reference to avoid infinite render loop
+  const defaultContext = Object.freeze({});
+
+  /** Slots uses a Double render strategy inspired by [reach-ui/descendants](https://github.com/reach/reach-ui/tree/develop/packages/descendants)
+   *  Slot registers themself with the Slots parent.
+   *  When all the children have mounted = registered themselves in slot,
+   *  we re-render the parent component to render with slots
+   */
+  const Slots: React.FC<{
+    context?: ContextProps['context'];
+    children: (slots: Slots) => React.ReactNode;
+  }> = ({ context = defaultContext, children }) => {
+    // initialise slots
+    const slotsDefinition: Slots = {};
+    slotNames.map(name => (slotsDefinition[name] = null));
+    const slotsRef = React.useRef<Slots>(slotsDefinition);
+
+    const rerenderWithSlots = useForceUpdate();
+    const [isMounted, setIsMounted] = React.useState(false);
+
+    // fires after all the effects in children
+    useLayoutEffect(() => {
+      rerenderWithSlots();
+      setIsMounted(true);
+    }, [rerenderWithSlots]);
+
+    const registerSlot = React.useCallback(
+      (name: SlotNames, contents: React.ReactNode) => {
+        slotsRef.current[name] = contents;
+
+        // don't render until the component mounts = all slots are registered
+        if (isMounted) {
+          rerenderWithSlots();
+        }
+      },
+      [isMounted, rerenderWithSlots],
+    );
+
+    // Slot can be removed from the tree as well,
+    // we need to unregister them from the slot
+    const unregisterSlot = React.useCallback(
+      (name: SlotNames) => {
+        slotsRef.current[name] = null;
+        rerenderWithSlots();
+      },
+      [rerenderWithSlots],
+    );
+
+    /**
+     * Slots uses a render prop API so abstract the
+     * implementation detail of using a context provider.
+     */
+    const slots = slotsRef.current;
+
+    return (
+      <SlotsContext.Provider value={{ registerSlot, unregisterSlot, context }}>
+        {children(slots)}
+      </SlotsContext.Provider>
+    );
+  };
+
+  const Slot: React.FC<{
+    name: SlotNames;
+    children:
+      | React.ReactNode
+      | ((context: ContextProps['context']) => React.ReactNode);
+  }> = ({ name, children }) => {
+    const { registerSlot, unregisterSlot, context } =
+      React.useContext(SlotsContext);
+
+    useLayoutEffect(() => {
+      registerSlot(
+        name,
+        typeof children === 'function' ? children(context) : children,
+      );
+      return () => unregisterSlot(name);
+    }, [name, children, registerSlot, unregisterSlot, context]);
+
+    return null;
+  };
+
+  return { Slots, Slot };
+};
+
+export default createSlots;