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@quarkd/core

v1.0.2

Published

Web components quark-element

Downloads

4

Readme

Quark Core

Quark Core 是一个优化 web components 开发体验的轻量级框架。部分实现思路参考Lit

使用

import QuarkElement, {
  Fragment,
  property,
  state,
  createRef,
  customElement
} from '@quarkd/core';
import style from './style.css';

@customElement({tag: 'quark-noticebar', style})
class QuarkNoticebar extends QuarkElement {
  @property()
  title: string = '';

  @property({type: Boolean})
  righthide: boolean = false;

  @state()
  count: number = 1

  rightSlotRef = createRef();

  handleRightClick = () => {
    this.$emit('rightclick');

    // 演示state装饰器
    this.count += 1;
  };

  handleRightSlotChange = () => {
    const { current } = this.rightSlotRef;
    if (current) {
      const hasChild = current.assignedNodes().length;
      current.style.paddingRight = hasChild ? '0px' : '11px';
    }
  };

  render() {
    return (
      <Fragment>
        <span>{this.title}</span>
        <span>{this.count}</span>
        <slot
          name="right"
          ref={this.rightSlotRef}
          onslotchange={this.handleRightSlotChange}
        >
          {!this.righthide && (
            <quark-icon
              name="right"
              size="15"
              onClick={this.handleRightClick}
            />
          )}
        </slot>
      </Fragment>
    );
  }
}

export default QuarkNoticebar;

API

  1. 装饰器:customElement(componentName: string) - 封装了customElements.define能力;
  2. 装饰器:property(options: Options)
    • observed
      • 类型:boolean
      • 默认值:true
      • 说明:标记当前属性是否接收外部的参数变化,会自动加入到observedAttributes数组中。
    • type
      • 值:Boolean | Number | String
      • 默认值:String
      • 说明:标记当前属性的类型,主要用于Boolean以及Number类型值的转换处理。
    • converter
      • 声明:(val: any, type?: typeof Boolean | typeof Number | typeof String) => any
      • 说明:从外部获取到属性时的值转换方法。
  3. 实例方法:render
    • 声明:() => string
    • 说明:返回的字符串用于赋值给shadowRoot.innerHTML,触发时机为QuarkElement基类的connectedCallback执行时。
  4. 生命周期方法:componentDidMount
    • 声明:() => void
    • 说明:connectedCallback触发时执行,此时组件dom已渲染完毕。相当于connectedCallback() { super.connectedCallback(); }
  5. 生命周期方法:shouldComponentUpdate
    • 声明:(propName: string, oldValue, newValue) => boolean
    • 说明:attributeChangedCallback触发时执行,用于控制当前属性变化是否导致组件更新渲染
  6. 生命周期方法:componentDidUpdate
    • 声明:(propName: string, oldValue, newValue) => void
    • 说明:attributeChangedCallback触发,render执行后触发,此时可拿到更新后的dom做相关操作
  7. 生命周期方法:componentWillUnmount
    • 声明:() => void
    • 说明:disconnectedCallback触发时、dom移除前执行,等同于disconnectedCallback() { super.disconnectedCallback(); }
  8. 实例方法:$on
    • 声明:(eventName: string, eventHandler: EventHandler, el?: Element) => void
    • 说明:支持为指定元素增加事件监听,并会在组件销毁时自动移除
  9. 实例方法:$emit
    • 声明:(eventName: string, customEventInit: CustomEventInit) => void
    • 说明:在当前组件中抛出自定义事件,相当于this.dispatchEvent(new CustomEvent(eventName, customEventInit))。

其他说明

  1. 无需再实现static get observedAttributes() {}
  2. 所有属性都建议增加默认值。
  3. 无需再手动执行 this.attachShadow({ mode: 'open' })。
  4. 旧的upgradeProperty方法能力已内置,代码中可以省略。
  5. Fragment的使用不是必须的,当你的render需要返回标签数组时使用,相当于react的<></>
  6. event需要全小写,例如ontouchstart、ontouchend、onclick