feat(example): example done

package.json

@@ -4,7 +4,7 @@
   "version": "1.0.0",
   "scripts": {
     "build": "rsbuild build",
-    "dev": "rsbuild dev --open",
+    "dev": "rsbuild dev",
     "format": "prettier --write .",
     "lint": "eslint .",
     "preview": "rsbuild preview"

src/App.css

@@ -1,8 +1,10 @@
 body {
   margin: 0;
-  color: #fff;
   font-family: Inter, Avenir, Helvetica, Arial, sans-serif;
-  background-image: linear-gradient(to bottom, #020917, #101725);
+
+  --color-parent: #61a5c2;
+  --color-child: #89c2d9;
+  --color-grandchild: #a9d6e5;
 }
 
 .content {
@@ -12,15 +14,48 @@ body {
   text-align: center;
   flex-direction: column;
   justify-content: center;
+  align-items: center;
 }
 
-.content h1 {
+.version__toggle {
-  font-size: 3.6rem;
+  text-transform: capitalize;
-  font-weight: 700;
 }
 
-.content p {
+.parent {
+  width: fit-content;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+  background-color: var(--color-parent);
+  padding: 2rem;
+  border-radius: 8px;
+}
+
+.child {
+  display: flex;
+  flex-direction: column;
+  gap: 1rem;
+  padding: 2rem;
+  border-radius: 8px;
+  background: var(--color-child);
+  position: relative;
+}
+
+.card__label {
+  padding: 0;
+  margin: 0;
+  position: absolute;
   font-size: 1.2rem;
-  font-weight: 400;
+  line-height: 1.2rem;
-  opacity: 0.5;
+  top: 0.4rem;
+  left: 0.4rem;
+  color: white;
+}
+
+.grandson {
+  position: relative;
+  padding: 1rem;
+  border-radius: 8px;
+  background: var(--color-grandchild);
 }

src/App.tsx

@@ -1,10 +1,27 @@
+import { useState } from 'react';
 import './App.css';
 import { Parent } from './children-render/parent';
+import { ParentFixed } from './children-render-fixed/parent-fixed';
+import { FamilyContextProvider } from './children-render-fixed/family-context';
 
 const App = () => {
+  const [version, setVersion] = useState<'normal' | 'fixed'>('normal');
+
   return (
     <div className="content">
+      <button
+        className="version__toggle"
+        onClick={() => setVersion(version === 'normal' ? 'fixed' : 'normal')}
+      >
+        Go to {version === 'normal' ? 'fixed' : 'normal'}
+      </button>
+      {version === 'normal' ? (
         <Parent />
+      ) : (
+        <FamilyContextProvider>
+          <ParentFixed />
+        </FamilyContextProvider>
+      )}
     </div>
   );
 };

src/children-render-fixed/child-fixed.tsx

@@ -0,0 +1,12 @@
+import { GrandsonFixed } from './grandson-fixed';
+
+export const ChildFixed = () => {
+  console.log('__children render');
+
+  return (
+    <div className="child">
+      <h6 className="card__label">Child</h6>
+      <GrandsonFixed />
+    </div>
+  );
+};

src/children-render-fixed/context-input.tsx

@@ -0,0 +1,13 @@
+import { useFamily } from './family-context';
+
+export const ContextInput = () => {
+  const { name, setName } = useFamily();
+  return (
+    <input
+      name="name"
+      type="text"
+      defaultValue={name}
+      onChange={(e) => setName(e.target.value)}
+    />
+  );
+};

src/children-render-fixed/family-context.tsx

@@ -0,0 +1,28 @@
+import { createContext, useContext, useState } from 'react';
+
+interface FamilyContextType {
+  name: string;
+  setName: (newName: string) => void;
+}
+
+const FamilyContext = createContext<FamilyContextType | undefined>(undefined);
+
+const FamilyContextProvider: React.FC<React.PropsWithChildren> = ({
+  children,
+}) => {
+  const [name, setName] = useState<string>('');
+  return (
+    <FamilyContext.Provider value={{ name, setName }}>
+      {children}
+    </FamilyContext.Provider>
+  );
+};
+
+const useFamily = () => {
+  const context = useContext(FamilyContext);
+  if (!context)
+    throw new Error('useFamily must be used within a FamilyContextProvider');
+  return context;
+};
+
+export { FamilyContextProvider, useFamily };

src/children-render-fixed/grandson-fixed.tsx

@@ -0,0 +1,14 @@
+import { useFamily } from './family-context';
+
+export const GrandsonFixed = () => {
+  console.log('__grandson render');
+
+  const { name } = useFamily();
+
+  return (
+    <div className="grandson">
+      <h6 className="card__label">Grandson</h6>
+      <p>Name: {name}</p>
+    </div>
+  );
+};

src/children-render-fixed/parent-fixed.tsx

@@ -0,0 +1,14 @@
+import { ChildFixed } from './child-fixed';
+import { ContextInput } from './context-input';
+
+export const ParentFixed = () => {
+  console.log('__parent render');
+
+  return (
+    <div className="parent">
+      <h4>I'm the parent</h4>
+      <ContextInput />
+      <ChildFixed />
+    </div>
+  );
+};

src/children-render/children.tsx

@@ -1,13 +1,29 @@
+import { useRef, useState } from 'react';
+import { Grandson } from './grandson';
+
 type ChildrenProps = {
   counter: number;
 };
 
 export const Children = (props: ChildrenProps) => {
   console.log('__children render');
+  const [myOwnState, setMyOwnState] = useState(0);
+  const myRef = useRef(0);
+
   return (
-    <div>
+    <div className="child">
-      <h6>I'm its child</h6>
+      <h6 className="card__label">Child</h6>
-      <p>My counter is {props.counter}</p>
+      <p>My parent counter is {props.counter}</p>
+      <label>My own counter ir {myOwnState}</label>
+      <button onClick={() => setMyOwnState((prev) => prev + 1)}>
+        +1 own state
+      </button>
+      <label>My ref {myRef.current}</label>
+      <button onClick={() => (myRef.current = myRef.current + 1)}>
+        +1 own ref
+      </button>
+
+      <Grandson parentState={myOwnState} grandparentState={props.counter} />
     </div>
   );
 };

src/children-render/grandson.tsx

@@ -0,0 +1,15 @@
+type GrandsonProps = {
+  grandparentState: number;
+  parentState: number;
+};
+
+export const Grandson = (props: GrandsonProps) => {
+  console.log('__grandson render');
+  return (
+    <div className="grandson">
+      <h6 className="card__label">Grandson</h6>
+      <p>Parent state: {props.parentState}</p>
+      <p>Grandparent state: {props.grandparentState}</p>
+    </div>
+  );
+};

src/children-render/parent.tsx

@@ -3,21 +3,28 @@ import { Children } from './children';
 
 export const Parent = () => {
   console.log('__parent render');
-  const [counter, setCounter] = useState(0);
+  const [ownState, setOwnState] = useState(0);
-  const [childrenCounter, setChildrenCounter] = useState(0);
+  const [childrenPropState, setChildrenPropState] = useState(0);
+  const [name, setName] = useState<string>('');
 
   return (
-    <div>
+    <div className="parent">
       <h4>I'm the parent</h4>
-      <button onClick={() => setCounter((prev) => prev + 1)}>
+      <input
-        Change own state! {counter}
+        name="name"
+        type="text"
+        defaultValue={name}
+        onChange={(e) => setName(e.target.value)}
+      />
+      <p>{name}</p>
+      <button onClick={() => setOwnState((prev) => prev + 1)}>
+        Change own state! {ownState}
       </button>
-      <button onClick={() => setChildrenCounter((prev) => prev + 1)}>
+      <button onClick={() => setChildrenPropState((prev) => prev + 1)}>
-        Change children state!
+        Change children state prop!
       </button>
       <div>
-        <h5>These are my children</h5>
+        <Children counter={childrenPropState} />
-        <Children counter={childrenCounter} />
       </div>
     </div>
   );