initially reduced form rerenders

app/src/modules/server/AdminController.tsx

@@ -191,6 +191,10 @@ export class AdminController extends Controller {
                   />
                   <link rel="icon" href={favicon} type="image/x-icon" />
                   <title>BKND</title>
+                  <script
+                     crossOrigin="anonymous"
+                     src="//unpkg.com/react-scan/dist/auto.global.js"
+                  />
                   {isProd ? (
                      <Fragment>
                         <script

app/src/ui/components/form/json-schema-form/Field.tsx

@@ -1,6 +1,7 @@
 import type { JSONSchema } from "json-schema-to-ts";
 import type { ChangeEvent, ComponentPropsWithoutRef } from "react";
 import * as Formy from "ui/components/form/Formy";
+import { useEvent } from "ui/hooks/use-event";
 import { ArrayField } from "./ArrayField";
 import { FieldWrapper } from "./FieldWrapper";
 import { useFieldContext } from "./Form";
@@ -32,7 +33,7 @@ export const Field = ({ name, schema: _schema, onChange, label: _label, hidden }
    const disabled = schema.readOnly ?? "const" in schema ?? false;
    //console.log("field", name, disabled, schema, ctx.schema, _schema);
 
-   function handleChange(e: ChangeEvent<HTMLInputElement>) {
+   const handleChange = useEvent((e: ChangeEvent<HTMLInputElement>) => {
       // don't remove for now, causes issues in anyOf
       /*const value = coerce(e.target.value, schema as any);
       setValue(pointer, value as any);*/
@@ -45,7 +46,7 @@ export const Field = ({ name, schema: _schema, onChange, label: _label, hidden }
          //console.log("setValue", pointer, value);
          setValue(pointer, value);
       }
-   }
+   });
 
    return (
       <FieldWrapper

app/src/ui/components/form/json-schema-form/Form.tsx

@@ -1,3 +1,5 @@
+import { atom, useAtom, useAtomValue, useSetAtom } from "jotai";
+import { selectAtom } from "jotai/utils";
 import { Draft2019, type JsonError } from "json-schema-library";
 import type { TemplateOptions as LibTemplateOptions } from "json-schema-library/dist/lib/getTemplate";
 import type { JsonSchema as LibJsonSchema } from "json-schema-library/dist/lib/types";
@@ -9,16 +11,32 @@ import {
    type FormEvent,
    type ReactNode,
    createContext,
+   useCallback,
    useContext,
    useEffect,
+   useMemo,
    useRef,
    useState
 } from "react";
 import { JsonViewer } from "ui/components/code/JsonViewer";
+import { useEvent } from "ui/hooks/use-event";
 import { Field } from "./Field";
 import { isRequired, normalizePath, omitSchema, prefixPointer } from "./utils";
 
 type JSONSchema = Exclude<$JSONSchema, boolean>;
+type FormState<Data = any> = {
+   dirty: boolean;
+   submitting: boolean;
+   errors: JsonError[];
+   data: Data;
+};
+
+const formStateAtom = atom<FormState>({
+   dirty: false,
+   submitting: false,
+   errors: [] as JsonError[],
+   data: {} as any
+});
 
 export type FormProps<
    Schema extends JSONSchema = JSONSchema,
@@ -72,19 +90,22 @@ export function Form<
    ...props
 }: FormProps<Schema, Data>) {
    const [schema, initial] = omitSchema(_schema, ignoreKeys, _initialValues);
-   const lib = new Draft2019(schema);
+   const lib = useMemo(() => new Draft2019(schema), [JSON.stringify(schema)]);
    const initialValues = initial ?? lib.getTemplate(undefined, schema, initialOpts);
-   const [data, setData] = useState<Partial<Data>>(initialValues);
-   const [dirty, setDirty] = useState<boolean>(false);
-   const [errors, setErrors] = useState<JsonError[]>([]);
-   const [submitting, setSubmitting] = useState<boolean>(false);
+   const [formState, setFormState] = useAtom<FormState<Data>>(formStateAtom);
    const formRef = useRef<HTMLFormElement | null>(null);
 
+   useEffect(() => {
+      console.log("setting data");
+      setFormState((prev) => ({ ...prev, data: initialValues }));
+   }, []);
+
    // @ts-ignore
    async function handleSubmit(e: FormEvent<HTMLFormElement>) {
       if (onSubmit) {
          e.preventDefault();
-         setSubmitting(true);
+         setFormState((prev) => ({ ...prev, submitting: true }));
+         //setSubmitting(true);
 
          try {
             const { data, errors } = validate();
@@ -97,72 +118,89 @@ export function Form<
          } catch (e) {
             console.warn(e);
          }
+         setFormState((prev) => ({ ...prev, submitting: false }));
 
-         setSubmitting(false);
+         //setSubmitting(false);
          return false;
       }
    }
 
-   function setValue(pointer: string, value: any) {
+   const setValue = useEvent((pointer: string, value: any) => {
       const normalized = normalizePath(pointer);
       //console.log("setValue", { pointer, normalized, value });
       const key = normalized.substring(2).replace(/\//g, ".");
-      setData((prev) => {
+      setFormState((state) => {
+         const prev = state.data;
+         const changed = immutable.set(prev, key, value);
+         onChange?.(changed, key, value);
+         //console.log("changed", prev, changed, { key, value });
+         return { ...state, data: changed };
+      });
+      /*setData((prev) => {
          const changed = immutable.set(prev, key, value);
          onChange?.(changed, key, value);
          //console.log("changed", prev, changed, { key, value });
          return changed;
+      });*/
    });
-   }
 
-   function deleteValue(pointer: string) {
+   const deleteValue = useEvent((pointer: string) => {
       const normalized = normalizePath(pointer);
       const key = normalized.substring(2).replace(/\//g, ".");
-      setData((prev) => {
+      setFormState((state) => {
+         const prev = state.data;
+         const changed = immutable.del(prev, key);
+         onChange?.(changed, key, undefined);
+         //console.log("changed", prev, changed, { key, value });
+         return { ...state, data: changed };
+      });
+      /*setData((prev) => {
          const changed = immutable.del(prev, key);
          onChange?.(changed, key, undefined);
          //console.log("changed", prev, changed, { key });
          return changed;
+      });*/
    });
-   }
 
    useEffect(() => {
-      setDirty(!isEqual(initialValues, data));
+      //setDirty(!isEqual(initialValues, data));
+      //setFormState((prev => ({ ...prev, dirty: !isEqual(initialValues, data) })));
 
       if (validateOn === "change") {
          validate();
-      } else if (errors.length > 0) {
+      } else if (formState?.errors?.length > 0) {
          validate();
       }
-   }, [data]);
+   }, [formState?.data]);
 
    function validate(_data?: Partial<Data>) {
-      const actual = _data ?? data;
+      const actual = _data ?? formState?.data;
       const errors = lib.validate(actual, schema);
       //console.log("errors", errors);
-      setErrors(errors);
+      setFormState((prev) => ({ ...prev, errors }));
+      //setErrors(errors);
       return { data: actual, errors };
    }
 
-   const context = {
-      data: data ?? {},
-      dirty,
-      submitting,
-      setData,
+   const context = useMemo(
+      () => ({
          setValue,
          deleteValue,
-      errors,
          schema,
          lib,
          options
-   } as any;
+      }),
+      []
+   ) as any;
    //console.log("context", context);
 
+   const Component = useMemo(() => {
+      return children ? children : <Field name="" />;
+   }, []);
+
    return (
       <form {...props} ref={formRef} onSubmit={handleSubmit}>
-         <FormContext.Provider value={context}>
-            {children ? children : <Field name="" />}
-         </FormContext.Provider>
+         <FormContext.Provider value={context}>{Component}</FormContext.Provider>
          {hiddenSubmit && (
             <button style={{ visibility: "hidden" }} type="submit">
                Submit
@@ -210,28 +248,62 @@ export function FormContextOverride({
    return <FormContext.Provider value={context}>{children}</FormContext.Provider>;
 }
 
+export function useFormValue(name: string) {
+   const pointer = normalizePath(name);
+   const isRootPointer = pointer === "#/";
+   const selected = selectAtom(
+      formStateAtom,
+      useCallback(
+         (state) => {
+            const data = state.data;
+            console.log("data", data);
+            return isRootPointer ? data : get(data, pointer.substring(2).replace(/\//g, "."));
+         },
+         [pointer]
+      ),
+      isEqual
+   );
+   return useAtom(selected)[0];
+}
+
 export function useFieldContext(name: string) {
-   const { data, lib, schema, errors: formErrors, ...rest } = useFormContext();
+   const { lib, schema, errors: formErrors = [], ...rest } = useFormContext();
    const pointer = normalizePath(name);
    const isRootPointer = pointer === "#/";
    //console.log("pointer", pointer);
-   const value = isRootPointer ? data : get(data, pointer.substring(2).replace(/\//g, "."));
-   const errors = formErrors.filter((error) => error.data.pointer.startsWith(pointer));
-   const fieldSchema = isRootPointer
-      ? (schema as LibJsonSchema)
-      : lib.getSchema({ pointer, data, schema });
-   const required = isRequired(pointer, schema, data);
+   const data = {};
 
-   return {
+   const value = useFormValue(name);
+   console.log("value", pointer, value);
+   //const value = isRootPointer ? data : get(data, pointer.substring(2).replace(/\//g, "."));
+   const errors = useMemo(
+      () => formErrors.filter((error) => error.data.pointer.startsWith(pointer)),
+      [name]
+   );
+   const fieldSchema = useMemo(
+      () => (isRootPointer ? (schema as LibJsonSchema) : lib.getSchema({ pointer, data, schema })),
+      [name]
+   );
+   const required = false; // isRequired(pointer, schema, data);
+   const options = useMemo(() => ({}), []);
+
+   return useMemo(
+      () => ({
          ...rest,
+         dirty: false,
+         submitting: false,
+         options,
          lib,
          value,
          errors,
          schema: fieldSchema,
          pointer,
          required
-   };
+      }),
+      [JSON.stringify([value])]
+   );
 }
+useFieldContext.displayName = "useFieldContext";
 
 export function Subscribe({ children }: { children: (ctx: FormContext<any>) => ReactNode }) {
    const ctx = useFormContext();
@@ -244,3 +316,21 @@ export function FormDebug() {
 
    return <JsonViewer json={{ dirty, submitting, data, errors }} expand={99} />;
 }
+
+function useFieldContext2(name: string) {
+   const ctx = useRef(useFormContext());
+   const pointer = normalizePath(name);
+   const isRootPointer = pointer === "#/";
+   //console.log("pointer", pointer);
+   const data = {};
+   const options = useMemo(() => ({}), []);
+   const required = false;
+
+   const value = useFormValue(name);
+   return { value, options, dirty: false, submitting: false, required, pointer };
+}
+
+export function FormDebug2({ name }: any) {
+   const { ...ctx } = useFieldContext2(name);
+   return <pre>{JSON.stringify({ ctx })}</pre>;
+}

app/src/ui/routes/test/tests/json-schema-form3.tsx

@@ -6,18 +6,12 @@ import {
    Form,
    FormContextOverride,
    FormDebug,
+   FormDebug2,
    ObjectField
 } from "ui/components/form/json-schema-form";
 import { Scrollable } from "ui/layouts/AppShell/AppShell";
 
-export default function JsonSchemaForm3() {
-   const { schema, config } = useBknd();
-
-   return (
-      <Scrollable>
-         <div className="flex flex-col p-3">
-            {/*<Form
-               schema={{
+const schema2 = {
    type: "object",
    properties: {
       name: { type: "string", default: "Peter" },
@@ -34,14 +28,21 @@ export default function JsonSchemaForm3() {
       }
    },
    required: ["age"]
-               }}
-               className="flex flex-col gap-3"
-            >
+};
+
+export default function JsonSchemaForm3() {
+   const { schema, config } = useBknd();
+
+   return (
+      <Scrollable>
+         <div className="flex flex-col p-3">
+            <Form schema={schema2} className="flex flex-col gap-3">
+               <div>random thing</div>
                <Field name="name" />
                <Field name="age" />
-               <Field name="gender" />
-               <Field name="deep" />
-            </Form>*/}
+               <FormDebug />
+               <FormDebug2 name="name" />
+            </Form>
 
             {/*<Form
             schema={{
@@ -90,7 +91,7 @@ export default function JsonSchemaForm3() {
          >
             <AutoForm />
          </Form>*/}
-            <Form
+            {/*<Form
                schema={{
                   type: "object",
                   properties: {
@@ -118,7 +119,7 @@ export default function JsonSchemaForm3() {
             >
                <Field name="" />
                <FormDebug />
-            </Form>
+            </Form>*/}
 
             {/*<Form
                schema={{