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jetpack-compose-is-like-reactjs.html
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<!DOCTYPE html><html><head><title>Jetpack Compose is like React.js</title><meta charset="utf-8"><style>body {
font-family: "Helvetica Neue", sans-serif;
margin: 0;
}
body * {
box-sizing: border-box;
}
.section {
background-color: #f4f4f4;
padding: 4em 3em;
}
.section:nth-child(2n) {
background-color: white;
}
.title {
font-size: 2.7em;
color: #888;
font-weight: 100;
letter-spacing: 0.2em;
text-align: center;
}
.case {}
.name {
font-size: 1.8em;
color: #444;
font-weight: 300;
text-align: center;
margin: 60px;
}
.pair {
display: flex;
display: -webkit-flex;
display: -ms-flexbox;
justify-content: center;
-webkit-justify-content: center;
-ms-box-pack: center;
-ms-box-align: center;
}
.card {
flex: 1;
-webkit-flex: 1;
-ms-flex: 1;
max-width: 590px;
margin: 0 10px;
}
.lang {
font-size: 1.3em;
color: #666;
padding-bottom: 0;
font-weight: 200;
letter-spacing: 0.07em;
}
.code {
font-size: 1.15em;
background-color: white;
margin: 0.4em 0 0 0;
padding: 0.4em;
line-height: 1.3em;
}
.section:nth-child(2n) .code {
background-color: #f4f4f4;
}
#fork-me {
position: absolute;
right: 0;
}
#note {
font-size: 1.5em;
color: #fff;
text-align: center;
padding: 0.6em;
background: #414141;
font-weight: 300;
letter-spacing: 0.05em;
}
</style><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.18.1/styles/github.min.css"><script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.18.1/highlight.min.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body><a target="_blank" href="https://github.com/linux-china/jetpack-compose-is-like-reactjs"><img id="fork-me" src="http://nilhcem.github.io/swift-is-like-kotlin/fork-me.png"></a><div id="note">Jetpack Compose is like React.js</div><div class="section"><div class="title">BASICS</div><div class="case"><div class="name">Hello World</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
Text("Hello world!")
}
}
}
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>const element = <h1>Hello, React.js</h1>;
ReactDOM.render(
element,
document.getElementById('root')
);
</code></pre></div></div></div><div class="case"><div class="name">Component</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>@Composable
fun Greeting(name: String) {
Text (text = "Hello $name!")
}
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>function Greeting({name}) {
return <p>Hello {name}</p>
}
</code></pre></div></div></div><div class="case"><div class="name">List</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>@Composable
fun MessageList(messages: List<Message>) {
Column {
messages.forEach { message ->
MessageRow(message)
}
}
}
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>function TodoList({items}) {
return <ul>
{items.map(item =>
<TodoItem item={item} key={item.key}/>)}
</ul>
}
</code></pre></div></div></div><div class="case"><div class="name">State</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>@Composable
fun Greeting(name: String) {
var text by remember { mutableStateOf("Hello, $name") }
Column {
Text(text = text)
Button(onClick = {
text = "Hello, Clicked!"
}) {
Text(text = "Click me");
}
}
}
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>import {useState} from "react";
export function Hello({name}) {
const [text, setText] = useState(name);
return <div>
<p>{text}</p>
<button onClick={event => {
setText("Hello, Clicked!");
}
}>Click me
</button>
</div>
}
</code></pre></div></div></div><div class="case"><div class="name">State for SubComponent</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>@Composable
fun Greeting(name: String) {
var text by remember { mutableStateOf("Hello, $name") }
Column {
Text(text = text)
Welcome {
text = it
}
}
}
@Composable
fun Welcome(setText: (text: String) -> Unit) {
}
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>import {useState} from "react";
export function Hello() {
const [year, setYear] = useState(2017);
return <div>Year: {year} <Welcome year={year} setYear={setYear}/></div>
}
export function Welcome({year, setYear}) {
return <button onClick={event => {
setYear(year + 1);
}
}>{year}</button>
}
</code></pre></div></div></div></div><div class="section"><div class="title">Coroutines/Async</div><div class="case"><div class="name">Coroutines/Promise</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>// Side-effects in Compose https://developer.android.google.cn/jetpack/compose/side-effects
@Composable
fun MoviesScreen(scaffoldState: ScaffoldState = rememberScaffoldState()) {
val scope = rememberCoroutineScope()
Scaffold(scaffoldState = scaffoldState) {
Column {
Button(
onClick = {
// Create a new coroutine in the event handler to show a snackbar
scope.launch {
scaffoldState.snackbarHostState.showSnackbar("Something happened!")
}
}
) {
Text("Press me")
}
}
}
}
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>export function Welcome({year, setYear}) {
return <button onClick={ async event => {
setYear(year + 1);
}
}>{year}</button>
}
</code></pre></div></div></div><div class="case"><div class="name">Side Effect</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>@Composable
fun LandingScreen(onTimeout: () -> Unit) {
// This will always refer to the latest onTimeout function that
// LandingScreen was recomposed with
val currentOnTimeout by rememberUpdatedState(onTimeout)
// Create an effect that matches the lifecycle of LandingScreen.
// If LandingScreen recomposes, the delay shouldn't start again.
LaunchedEffect(true) {
delay(SplashWaitTimeMillis)
currentOnTimeout()
}
/* Landing screen content */
}
</code></pre></div><div class="card"><div class="lang">TypeScript</div><pre class="code"><code>import React, { useState, useEffect } from 'react';
function Example() {
const [count, setCount] = useState(0);
// Similar to componentDidMount and componentDidUpdate:
useEffect(() => {
// Update the document title using the browser API
document.title = `You clicked ${count} times`;
}, [count]);
return (
<div>
<p>You clicked {count} times</p>
<button onClick={() => setCount(count + 1)}>
Click me
</button>
</div>
);
}
</code></pre></div></div></div></div><div class="section"><div class="title">Material UI</div><div class="case"><div class="name">Button</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>// https://material.io/
setContent {
MaterialTheme {
Text(
text = "Hello theming",
color = MaterialTheme.colors.primary
)
}
}
</code></pre></div><div class="card"><div class="lang">jsx</div><pre class="code"><code>// https://material-ui.com/
import React from 'react';
import ReactDOM from 'react-dom';
import Button from '@material-ui/core/Button';
function App() {
return (
<Button variant="contained" color="primary">
你好，世界
</Button>
);
}
ReactDOM.render(<App />, document.querySelector('#app'));
</code></pre></div></div></div></div><div class="section"><div class="title">Layout</div><div class="case"><div class="name">Box</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>@Composable
fun MatchParentSizeComposable() {
Box {
Spacer(Modifier.matchParentSize().background(Color.LightGray))
ArtistCard()
}
}
</code></pre></div><div class="card"><div class="lang">xml</div><pre class="code"><code><Box component="span" m={1}>
<Button />
</Box>
</code></pre></div></div></div><div class="case"><div class="name">Grid/Column</div><div class="pair"><div class="card"><div class="lang">Kotlin</div><pre class="code"><code>@Composable
fun ArtistCard() {
Column {
Text("Alfred Sisley")
Text("3 minutes ago")
}
}
</code></pre></div><div class="card"><div class="lang">xml</div><pre class="code"><code><Grid container spacing={1}>
<Grid container item xs={12} spacing={3}>
<FormRow />
</Grid>
<Grid container item xs={12} spacing={3}>
<FormRow />
</Grid>
<Grid container item xs={12} spacing={3}>
<FormRow />
</Grid>
</Grid>
</code></pre></div></div></div></div></body></html>