
<template>
  <div id='mapZoomSlider' ref='mapZoomSlider'>
    <div id='zoomout' @click="zoomOut">-</div>
    <div id='zoomBarContainer'>
      <div id='zoomBarBackground' ref='zoomBarBackground' v-bind:style="{ height: conf.levels *conf.levelBarHeight+'px' }"></div>
      <ul id='zoomBar' style="padding-left:0px;margin:0px;">
        <li v-for="n in conf.levels" :key="n" style="margin-top:0px;" v-bind:style="{ height: conf.levelBarHeight+'px' }" @click="setLevel(n)">-</li>
      </ul>
      <div id='zoomHandler' ref='zoomHandler' v-bind:style="{ top: top+'px' }"></div>
    </div>
    <div id='zoomin' v-bind:style="{ top: pos+'px' }" @click="zoomIn">+</div>
  </div>
</template>
<script>
import $ from 'jquery'
import { target, cloneTarget } from '@/base/Drag.js'
export default {
  name: 'bs-zoombar',
  render () { },
  data () {
    return {
      conf: {
        levels: 6,
        levelBarHeight: 15,
        levelStart: -1,
        levelEnd: -1
      },
      top: 0
    }
  },
  props: {
  },
  computed: {
    pos () {
      return this.conf.levels * this.conf.levelBarHeight + 30
    }
  },
  watch: {
  },
  methods: {
    drag (e) {
      cloneTarget(e)
    },
    setLevel (index) {
      var { levels, levelBarHeight } = this.conf
      this.$parent.setLevel(levels - index)
      this.top = index * levelBarHeight - 7
    },
    zoomIn () {
      this.$parent.zoomIn()
    },
    zoomOut () {
      this.$parent.zoomOut()
    },
    load () {
      const { $parent } = this
      let nowIndex = 0
      let currentLevel = $parent.getLevel()
      var { levels, levelStart, levelBarHeight, levelEnd } = this.conf
      if (levelStart >= 0 && levelEnd > 0) {
        currentLevel = currentLevel < levelStart ? levelStart : currentLevel
        levelEnd = levelEnd > levels - 1 ? levels - 1 : levelEnd
        currentLevel = currentLevel > levelEnd ? levelEnd : currentLevel
        levels = levelEnd - levelStart + 1
        $parent.setLevel(currentLevel)
      }
      const _container = $('#mapZoomSlider')
      const _zoomHandler = $('#zoomHandler')
      let zoomBarHeight = levels * levelBarHeight
      target('zoomHandler', {
        seed: 'zoomSlider',
        onlyY: true,
        minY: _container.position().top,
        maxY: zoomBarHeight,
        isCapture: true,
        captureArea: 'zoomBar',
        captureCallFunc: function (o) {
          _zoomHandler.css({
            top: o.position.top - 116
          })
          nowIndex = o.index
        },
        mouseUpCallFunc: function () {
          $parent.setLevel(levels - nowIndex + levelStart - 1)
        }
      })
      _zoomHandler.css({
        top: zoomBarHeight - currentLevel * levelBarHeight - 4
      })
      this.top = zoomBarHeight - currentLevel * levelBarHeight - 7
      $parent.$on('zoom', (config) => {
        var zoom = config.zoom
        this.top = zoomBarHeight - zoom * levelBarHeight - 7
      })
    }
  },
  mounted () {
    this.$parent.$on('ready', (config) => {
      this.load()
    })
  }
}
</script>
 <style scoped>
#mapZoomSlider {
  position: absolute;
  margin-top: 115px;
  margin-left: 38px;
  z-index: 1500;
}

#zoomBarContainer {
  position: absolute;
  top: 25px;
}

#zoomBarContainer #zoomBar {
  position: absolute;
}

#zoomBarContainer #zoomBar li {
  width: 12px;
  display: block;
  line-height: 20px;
  text-align: right;
  font-size: 12px;
  cursor: pointer;
}

#zoomBarContainer #zoomBarBackground {
  width: 5px;
  background: #99CCFF;
  position: absolute;
  border: 1px solid #b5bcc7;
  height: 100%;
  font-size: 0px;
  display: inline;
}

#zoomBarContainer #zoomHandler {
  position: absolute;
  width: 16px;
  height: 15px;
  cursor: pointer;
  margin-left: -4px;
  background: url("data:image/png;base64,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") no-repeat;
  top: 4px;
}

#zoomin {
  width: 18px;
  height: 18px;
  cursor: pointer;
  left: -6px;
  background: #99CCFF;
  position: absolute;
  border: 1px solid #b5bcc7;
  line-height: 15px;
  text-align: center;
}

#zoomout {
  width: 18px;
  height: 18px;
  cursor: pointer;
  left: -6px;
  background: #99CCFF;
  position: absolute;
  border: 1px solid #b5bcc7;
  line-height: 15px;
  text-align: center;
}
</style>
