ui/src/form/button.js

/**
 * {按钮组件}
 * @author yutent<yutent.io@gmail.com>
 * @date 2023/03/06 15:17:25
 */

import { css, html, Component, nextTick, styleMap } from '@bd/core'
import '../icon/index.js'

class Button extends Component {
  static props = {
    type: 'primary',
    icon: '',
    size: 'l',
    autofocus: false,
    loading: {
      type: Boolean,
      default: false,
      observer(val) {
        if (val) {
          this.cacheIcon = this.icon
          this.icon = 'loading'
        } else {
          this.icon = this.cacheIcon === void 0 ? this.icon : this.cacheIcon
        }
      }
    },
    disabled: false,
    lazy: 0 // 并发拦截时间, 单位毫秒
  }

  static styles = [
    // 基础样式
    css`
      :host {
        overflow: hidden;
        display: inline-flex;
        border: 0;
        border-radius: 3px;
        user-select: none;
        -moz-user-select: none;
        color: var(--color-dark-1);
        font-size: 14px;
        cursor: pointer;
        transition: box-shadow 0.15s linear;

        button {
          display: flex;
          justify-content: center;
          align-items: center;
          width: 100%;
          min-width: 1px;
          height: inherit;
          padding: var(--button-padding, 0 4px);
          line-height: 1;
          border: 1px solid transparent;
          border-radius: inherit;
          white-space: nowrap;
          background: #fff;
          font-size: inherit;
          font-family: inherit;
          outline: none;
          color: inherit;
          cursor: inherit;
          transition: background 0.15s linear, color 0.15s linear;

          &::-moz-focus-inner {
            border: none;
          }
        }

        .icon {
          --size: var(--icon-size, 14px);
        }
      }
      :host(:focus-within) {
        box-shadow: 0 0 0 2px var(--color-plain-a);
      }
    `,
    // 尺寸
    css`
      @use 'sass:map';
      $sizes: (
        s: (
          w: 52px,
          h: 20px,
          f: 12px
        ),
        m: (
          w: 72px,
          h: 24px,
          f: 12px
        ),
        l: (
          w: 108px,
          h: 32px,
          f: 14px
        ),
        xl: (
          w: 132px,
          h: 36px,
          f: 14px
        ),
        xxl: (
          w: 160px,
          h: 44px,
          f: 14px
        ),
        xxxl: (
          w: 192px,
          h: 52px,
          f: 16px
        )
      );

      @loop $s, $v in $sizes {
        :host([size='#{$s}']) {
          min-width: map.get($v, 'w');
          height: map.get($v, 'h');
          font-size: map.get($v, 'f');

          .icon {
            --size: var(--icon-size, #{map.get($v, 'f')});
          }
        }
        :host([size='#{$s}'][circle]) {
          width: map.get($v, 'h');
          height: map.get($v, 'h');
        }
      }

      :host([dashed]) button {
        border-style: dashed;
      }

      :host([round]) {
        border-radius: 32px;
      }
      :host([circle]) {
        min-width: 0;
        border-radius: 50%;
        button {
          padding: 0;
        }
        .icon {
          margin-right: 0;
        }

        slot {
          display: none;
        }
      }
    `,
    // 配色
    css`
      $colors: (
        primary: 'teal',
        info: 'blue',
        success: 'green',
        warning: 'orange',
        danger: 'red',
        secondary: 'dark',
        help: 'grey',
        plain: 'plain'
      );

      @loop $t, $c in $colors {
        :host([type='#{$t}']) {
          button {
            color: var(--color-#{$c}-2);
            border-color: var(--color-#{$c}-1);

            &:hover {
              color: var(--color-#{$c}-1);
              border-color: var(--color-#{$c}-2);
            }
            &:active {
              color: var(--color-#{$c}-3);
            }
            &:disabled {
              color: var(--color-#{$c}-2);
            }
          }

          &:host([solid]) button {
            border: 0;
            @if $t == 'plain' {
              color: var(--color-dark-1);
            } @else {
              color: #fff;
            }
            background: var(--color-#{$c}-2);

            &:hover {
              background: var(--color-#{$c}-1);
            }
            &:active {
              background: var(--color-#{$c}-3);
            }

            &:disabled {
              background: var(--color-#{$c}-2);
            }
          }

          &:host(:focus-within) {
            box-shadow: 0 0 0 2px var(--color-#{$c}-a);
          }
        }
      }
    `,
    // 状态
    css`
      :host([loading]),
      :host([disabled]) {
        cursor: not-allowed;
        opacity: 0.6;
      }
    `
  ]

  #empty = true

  fixStyle() {
    this.#empty = this.$refs.cont?.assignedNodes().length === 0
    this.$requestUpdate()
  }

  created() {
    this.stamp = 0

    this._clickFn = this.$on(
      'click',
      ev => {
        let { loading, disabled, lazy } = this
        let now = Date.now()

        if (loading || disabled) {
          return ev.stopPropagation()
        }
        // 并发拦截
        if (lazy > 0 && now - this.stamp < lazy) {
          return ev.stopPropagation()
        }
        this.stamp = now
      },
      true
    )
  }

  mounted() {
    if (this.autofocus) {
      nextTick(_ => this.$refs.btn.focus())
    }
    nextTick(_ => this.fixStyle())
  }

  render() {
    let style = styleMap({ 'margin-right': this.#empty ? 0 : '4px' })
    return html`
      <button ref="btn" disabled=${this.disabled || this.loading}>
        <wc-icon class="icon" name=${this.icon} style=${style}></wc-icon>
        <slot ref="cont"></slot>
      </button>
    `
  }
}

Button.reg('button')