<template>
  <v-tooltip bottom>
    <template v-slot:activator="{ on, attrs }">
      <v-btn
        icon
        v-bind="attrs"
        class="d-none d-md-flex"
        @click="click"
        v-on="on"
      >
        <v-icon v-text="isFullscreen?'mdi-fullscreen-exit':'mdi-fullscreen'" />
      </v-btn>
    </template>
    <span>全屏</span>
  </v-tooltip>
</template>

<script>
import screenfull from 'screenfull'

export default {
  name: 'Screenfull',
  data() {
    return {
      isFullscreen: false
    }
  },
  mounted() {
    this.init()
  },
  beforeDestroy() {
    this.destroy()
  },
  methods: {
    click() {
      if (!screenfull.isEnabled) {
        this.$message.warning('浏览器不支持全屏模式')
        return false
      }
      screenfull.toggle()
    },
    change() {
      this.isFullscreen = screenfull.isFullscreen
    },
    init() {
      if (screenfull.isEnabled) {
        screenfull.on('change', this.change)
      }
    },
    destroy() {
      if (screenfull.enabled) {
        screenfull.off('change', this.change)
      }
    }
  }
}
</script>