为jeecgboot的JModal增加拖动窗体功能

<template>
  <a-modal
    ref="modal"
    :class="getClass(modalClass)"
    :style="getStyle(modalStyle)"
    :visible="visible"
    v-bind="_attrs"
    v-on="$listeners"
    @ok="handleOk"
    @cancel="handleCancel"
  >
 
    <slot></slot>
 
    <template v-if="!isNoTitle" slot="title">
      <a-row class="j-modal-title-row" type="flex">
        <a-col class="left">
          <slot name="title">{{ title }}</slot>
        </a-col>
        <a-col v-if="switchFullscreen" class="right" @click="toggleFullscreen">
          <a-button class="ant-modal-close ant-modal-close-x" ghost type="link" :icon="fullscreenButtonIcon"/>
        </a-col>
      </a-row>
    </template>
 
    <!-- 处理 scopedSlots -->
    <template v-for="slotName of scopedSlotsKeys" :slot="slotName">
      <slot :name="slotName"></slot>
    </template>
 
    <!-- 处理 slots -->
    <template v-for="slotName of slotsKeys" v-slot:[slotName]>
      <slot :name="slotName"></slot>
    </template>
 
  </a-modal>
</template>
 
<script>
 
  import { getClass, getStyle } from '@/utils/props-util'
  import { triggerWindowResizeEvent } from '@/utils/util'
  var mouseDownX = 0
  var mouseDownY = 0
  var deltaX = 0
  var deltaY = 0
  var sumX = 0
  var sumY = 0
 
  var header = null
  var contain = null
  var modalContent = null
 
  var onmousedown = false
  export default {
    name: 'JModal',
    props: {
      title: String,
      // 可使用 .sync 修饰符
      visible: Boolean,
      // 是否全屏弹窗，当全屏时无论如何都会禁止 body 滚动。可使用 .sync 修饰符
      fullscreen: {
        type: Boolean,
        default: false
      },
      // 是否允许切换全屏（允许后右上角会出现一个按钮）
      switchFullscreen: {
        type: Boolean,
        default: false
      },
      // 点击确定按钮的时候是否关闭弹窗
      okClose: {
        type: Boolean,
        default: true
      },
    },
    data() {
      return {
        // 内部使用的 slots ，不再处理
        usedSlots: ['title'],
        // 实际控制是否全屏的参数
        innerFullscreen: this.fullscreen,
      }
    },
    computed: {
      // 一些未处理的参数或特殊处理的参数绑定到 a-modal 上
      _attrs() {
        let attrs = { ...this.$attrs }
        // 如果全屏就将宽度设为 100%
        if (this.innerFullscreen) {
          attrs['width'] = '100%'
        }
        return attrs
      },
      modalClass() {
        return {
          'j-modal-box': true,
          'fullscreen': this.innerFullscreen,
          'no-title': this.isNoTitle,
          'no-footer': this.isNoFooter,
        }
      },
      modalStyle() {
        let style = {}
        // 如果全屏就将top设为 0
        if (this.innerFullscreen) {
          style['top'] = '0'
        }
        return style
      },
      isNoTitle() {
        return !this.title && !this.allSlotsKeys.includes('title')
      },
      isNoFooter() {
        return this._attrs['footer'] === null
      },
      slotsKeys() {
        return Object.keys(this.$slots).filter(key => !this.usedSlots.includes(key))
      },
      scopedSlotsKeys() {
        return Object.keys(this.$scopedSlots).filter(key => !this.usedSlots.includes(key))
      },
      allSlotsKeys() {
        return Object.keys(this.$slots).concat(Object.keys(this.$scopedSlots))
      },
      // 切换全屏的按钮图标
      fullscreenButtonIcon() {
        return this.innerFullscreen ? 'fullscreen-exit' : 'fullscreen'
      },
    },
    watch: {
      visible() {
        if (this.visible) {
          this.innerFullscreen = this.fullscreen
        }
        this.$nextTick(() => {
          this.initialEvent(this.visible)
        })
 
      },
      innerFullscreen(val) {
        this.$emit('update:fullscreen', val)
      },
    },
    mounted () {
      this.$nextTick(() => {
        this.initialEvent(this.visible)
      })
    },
    beforeDestroy () {
      this.removeMove()
      window.removeEventListener('mouseup', this.removeUp, false)
    },
    methods: {
 
      getClass(clazz) {
        return { ...getClass(this), ...clazz }
      },
      getStyle(style) {
        return { ...getStyle(this), ...style }
      },
 
      close() {
        this.$emit('update:visible', false)
      },
 
      handleOk() {
        this.resetNum()
        if (this.okClose) {
          this.close()
        }
      },
      handleCancel() {
        this.resetNum()
        this.close()
      },
      resetNum () {
        mouseDownX = 0
        mouseDownY = 0
        deltaX = 0
        deltaY = 0
        sumX = 0
        sumY = 0
      },
      handleMove (event) {
        const delta1X = event.pageX - mouseDownX
        const delta1Y = event.pageY - mouseDownY
 
        deltaX = delta1X
        deltaY = delta1Y
        // console.log('delta1X:' + delta1X, 'sumX:' + sumX, 'delta1Y:' + delta1Y, 'sumY:' + sumY)
        modalContent.style.transform = `translate(${delta1X + sumX}px, ${delta1Y + sumY}px)`
      },
      initialEvent (visible) {
        // console.log('--------- 初始化')
        // console.log('simpleClass===>', this.simpleClass)
        // console.log('document===>', document)
        if (visible) {
          setTimeout(() => {
            window.removeEventListener('mouseup', this.removeUp, false)
            contain = document.getElementsByClassName('j-modal-box')[0]
            header = contain.getElementsByClassName('ant-modal-header')[0]
            modalContent = contain.getElementsByClassName('ant-modal-content')[0]
 
            modalContent.style.left = 0
            modalContent.style.transform = 'translate(0px,0px)'
 
            // console.log('初始化-header:', header)
            // console.log('初始化-contain:', contain)
            // console.log('初始化-modalContent:', modalContent)
 
            header.style.cursor = 'all-scroll'
 
            // contain.onmousedown = (e) => {
            header.onmousedown = (e) => {
              onmousedown = true
              mouseDownX = e.pageX
              mouseDownY = e.pageY
              document.body.onselectstart = () => false
              window.addEventListener('mousemove', this.handleMove, false)
            }
 
            window.addEventListener('mouseup', this.removeUp, false)
          }, 0)
        }
      },
      removeMove () {
        window.removeEventListener('mousemove', this.handleMove, false)
      },
      removeUp (e) {
        // console.log('removeUp')
        document.body.onselectstart = () => true
 
        if (onmousedown && !(e.pageX === mouseDownX && e.pageY === mouseDownY)) {
          onmousedown = false
          sumX = sumX + deltaX
          sumY = sumY + deltaY
          // console.log('sumX:' + sumX, 'sumY:' + sumY)
        }
 
        this.removeMove()
        // this.checkMove()
      },
      /** 切换全屏 */
      toggleFullscreen() {
        this.innerFullscreen = !this.innerFullscreen
        triggerWindowResizeEvent()
      },
 
    }
  }
</script>
 
<style lang="less">
  .j-modal-box {
 
    &.fullscreen {
      top: 0;
      left: 0;
      padding: 0;
 
      // 兼容1.6.2版本的antdv
      & .ant-modal {
        top: 0;
        padding: 0;
        height: 100vh;
      
      }
 
      & .ant-modal-content {
        height: 100vh;
        border-radius: 0;
 
        & .ant-modal-body {
          /* title 和 footer 各占 55px */
          height: calc(100% - 55px - 55px);
          overflow: auto;
        }
      }
 
      &.no-title, &.no-footer {
        .ant-modal-body {
          height: calc(100% - 55px);
        }
      }
 
      &.no-title.no-footer {
        .ant-modal-body {
          height: 100%;
        }
      }
    }
 
    .j-modal-title-row {
      .left {
         calc(100% - 56px - 56px);
      }
 
      .right {
         56px;
        position: inherit;
 
        .ant-modal-close {
          right: 56px;
          color: rgba(0, 0, 0, 0.45);
 
          &:hover {
            color: rgba(0, 0, 0, 0.75);
          }
        }
      }
    }
  }
 
  @media (max- 767px) {
    .j-modal-box.fullscreen {
      margin: 0;
      max- 100vw;
    }
  }
</style>
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版权声明：本文为CSDN博主「78」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/78/article/details/114967142