frontend/src/components/Discussion/DiscussionArea.vue

<template>
  <div class="discussion-area">
    <h1 class="sub-title vertical-center">
      讨论区
      <c-button theme="green" :left="12" :icon="focus ? 'unfold_less' : 'edit'" text @click="handleFocusButtonClick">
        {{focus ? '隐藏编辑器' : '讨论｜笔记'}}
      </c-button>
      <c-button :no-bold="personal" text :theme="personal ? 'blue' : ''"
                :icon="personal ? 'check_box' : 'check_box_outline_blank'"
                title="如果设置为私人笔记，则这条讨论仅自己可见"
                @click="handleSetPersonal">笔记模式
      </c-button>
    </h1>
    <div class="discussion-area-content">
      <show-transition>
        <write-new-comment :show="personal" v-show="focus" class="mb-8" ref="writeComment"
                           @comment-submit="handleCommentSubmit"
                           :placeholder="writingAreaPlaceholder"></write-new-comment>
      </show-transition>
      <div v-show="notes.length">
        <div class="line"><span>私人笔记</span></div>
        <template v-for="comment of notes">
          <c-comment :key="'note' + comment.id" :comment="comment" personal
                     @need-refresh="updateComments"
          >
          </c-comment>
        </template>
      </div>
      <div class="line"><span>公共讨论区</span></div>
      <div class="no-content-warning" v-if="comments === null">
        <div class="no-content-warning-tip">加载中...</div>
      </div>
      <div class="no-content-warning" v-else-if="comments.length === 0 && wsComments.length === 0">
        本页还没有讨论
      </div>
      <template v-for="comment of wsComments">
        <c-comment v-if="comment.pageNumber === currentPage" :key="comment.id" :comment="comment" is-new
                   @need-refresh="updateComments"
        >
        </c-comment>
      </template>
      <template v-for="comment of comments">
        <c-comment :key="comment.id" :comment="comment"
                   @need-refresh="updateComments"
        >
        </c-comment>
      </template>
    </div>
  </div>
</template>

<script>
import CComment from '@/components/Discussion/CComment'
import WriteNewComment from '@/components/Discussion/WriteNewComment'
import { mapState } from 'vuex'
import { createComment, getComments, getSelfCommentsBySlide } from '@/server/comment'
import WebsocketPublisher from '@/server/websocket/ws'
import { useCommentWsServer } from '@/config/server-info'
import CButton from '@/components/Basic/CButton'
import ShowTransition from '@/animations/ShowTransition'
import { FOCUS_ON_INPUT, SET_PERSONAL, USE_FOCUS } from '@/store/types/pdf-types'

export default {
  components: { ShowTransition, CButton, WriteNewComment, CComment },
  data () {
    return {
      comments: null,
      notes: [],
      wsComments: [],
      slideId: this.$route.params.slideId
    }
  },
  mounted () {
    this.initWs()
    this.updateComments()
  },
  computed: {
    ...mapState({
      userInfo: state => state.main.userInfo,
      currentPage: state => state.pdf.currentPage,
      focus: state => state.pdf.focus,
      personal: state => state.pdf.personal
    }),
    writingAreaPlaceholder () {
      return '主题'
    }
  },
  watch: {
    currentPage () {
      this.comments = null
      this.updateComments()
    }
  },
  beforeDestroy () {
    this._ws.close()
  },
  methods: {
    initWs () {
      this._ws = new WebsocketPublisher(useCommentWsServer('/slide/') + this.$route.params.slideId)
      this._ws.subscribe({
        onNext: data => {
          this.wsComments.unshift(data)
        },
        onError: err => {
          this.$setErrorMessage(err)
        },
        onClose: () => {}
      })
    },
    updateComments () {
      this.getComments(1000)
      this.getNote(1000)
    },
    getComments (size) {
      return getComments({
        slideId: this.slideId,
        size,
        pageNumber: this.currentPage,
        sort: ['topNumber,desc', 'createAt,desc']
      }).then(res => {
        this.wsComments = []
        this.comments = res.data
      }).catch(err => {
        this.$setErrorMessage('获取本页评论区的过程中：' + err.response.data.msg)
      })
    },
    getNote (size) {
      return getSelfCommentsBySlide({
        slideId: this.slideId,
        pageNumber: this.currentPage,
        show: false,
        size: 1000,
        sort: ['createAt,desc']
      })
        .then(res => {
          this.notes = []
          this.notes = res.data
        })
        .catch(err => this.$setErrorMessage(err.response.data.msg))
    },
    handleCommentSubmit (comment) {
      createComment({
        slideId: this.slideId,
        pageNumber: this.currentPage,
        title: comment.title,
        content: comment.content,
        show: !this.personal
      }).then(res => {
        this.$refs.writeComment.resetContent()
        this.$setSuccessMessage('您的讨论帖发表成功')
        if (this.personal) {
          this.getNote(1000)
        }
      }).catch(err => {
        this.$setErrorMessage(err.response.data.msg)
      })
    },
    handleFocusButtonClick () {
      this.focus ? this.$store.commit(USE_FOCUS) : this.$store.commit(FOCUS_ON_INPUT)
    },
    handleSetPersonal () {
      this.$store.commit(SET_PERSONAL, { personal: !this.personal })
    }
  }
}
</script>

<style lang="scss" scoped>
.discussion-area {
  max-width: 410px;
  padding: 12px 12px 0 12px;
  box-sizing: border-box;

  position: fixed;
  min-width: 405px;
  max-height: calc(100vh - 76px);
  overflow: auto;
  overflow-x: hidden;
  bottom: 0;
  right: 0;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  background-color: white;
  border: 1px solid #e8e8e8;
}

.no-content-warning {
  height: 50px;
}

.c-comment:nth-child(2n-1) {
  background-color: #f9f9f9;
}

.c-comment:nth-child(2n) {
  background-color: white;
}

@media (max-width: 500px) {
  .discussion-area {
    min-width: unset;
    max-width: unset;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 1);
  }
}

.line {
  position: relative;
  font-size: 12px;
  font-weight: normal;
  text-align: center;
  line-height: 0;
  margin: 4px 0;

  & > span {
    color: #5a6a7a;
    display: inline-block;
    background-color: white;
    padding: 4px 12px;
    line-height: 12px;
  }

  &:before {
    z-index: -1;
    content: '';
    width: 100%;
    position: absolute;
    left: 0;
    top: 6px;
    border-bottom: 1px solid #aabaca;
  }
}
</style>