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@lcui/react

v0.6.0

Published

A React library for LCUI development

Readme

@lcui/react

(中文/English)

一个用于 LCUI 应用程序开发的 React 库,提供 TypeScript 类型声明、React 版预置组件,配合 @lcui/cli 使用。

安装

npm install -D @lcui/react

使用

import { useState, useRef, TextInput, Button } from "@lcui/react";
import styles from "./app.module.css";

export default function App() {
  const inputRef = useRef();
  const [name, setName] = useState("World");

  return (
    <div className={styles.app}>
      Hello, {name}!
      <TextInput ref={inputRef} placeholder="Please input..." />
      <Button onClick={() => setName(inputRef.current.value)}>Change</Button>
    </div>
  );
}

LCUI 并不是浏览器引擎,像按钮、文本输入框等原生控件需要由特定的 LCUI 组件实现,因此,在 JSX 写法上会有如下差异:

  <div className={styles.app}>
    Hello, World!
-   <input placeholder="Please input..." />
+   <TextInput placeholder="Please input..." />
-   <button>Click here</button>
+   <Button>Click here</Button>
  <div>

字符串形态的事件处理器

在 LCUI 项目里,事件处理器可以直接是 C 函数名而不是 JavaScript 回调。 @lcui/react 对 React 的 JSX 类型做了类型扩展,让 LCUI 真正派发的那些 on* 事件属性额外接受 string

<button onClick="handle_button_click">Run</button>
<button onDoubleClick="handle_button_dblclick">Run</button>
<TextInput onChange="handle_text_change" />

@lcui/cli 的 ts-loader 在编译期识别这种写法,并在生成的头文件中产出:

static void handle_button_click(ui_widget_t *w, ui_event_t *e, void *arg);
/* ... */
ui_widget_on(w, "click", handle_button_click, w);

handle_button_click 的实现需要你在配套的 .c 业务代码中自行编写。 传统的 JavaScript 回调写法(onClick={() => { ... }})依然可用,类型检查 照旧。

覆盖范围来自 LCUI 的 ui_event_type_t

  • 鼠标:onClickonDoubleClickonMouseDownonMouseUponMouseMoveonMouseOveronMouseOutonWheel
  • 键盘:onKeyDownonKeyUponKeyPress
  • 焦点:onFocusonBlur
  • 剪贴板:onPaste
  • 值变化:onChange(textinput 等 widget 在内部值更新后对外派发的语义 事件 "change"

有少数 React 习惯名与 LCUI 实际事件名不一致,React 编译器会自动重映射:

  • onDoubleClick"dblclick"

LCUI 不派发的事件(drag / pointer / animation / transition / contextmenu, 以及命名不一致的 touch 系列)以及 SVGAttributes 命名空间这里都 放开 string——传字符串时 tsc 会直接报错,避免编出来跑不起来的代码。

许可

MIT