frontend/src/components/Discussion/WriteNewComment.vue

<template>
  <div class="write-new-comment">
    <label>
      <input ref="title" @keydown="handleTitleKey" type="text" v-model="title" :placeholder="placeholder || '讨论主题'" maxlength="100">
    </label>
    <label>
      <textarea @keyup="handleContentKey" ref="content" v-model="content" placeholder="详细内容"></textarea>
    </label>
    <icon-button class="send-button" theme="green" @click="handleSubmitComment" :size="32">send</icon-button>
  </div>
</template>

<script>
import IconButton from '@/components/Basic/IconButton'
import { mapState } from 'vuex'

export default {
  props: ['placeholder'],
  components: { IconButton },
  computed: {
    ...mapState({
      focus: state => state.pdf.focus
    })
  },
  watch: {
    focus: {
      handler () {
        this.focus && this.$refs.title.focus()
      }
    }
  },
  data () {
    return {
      title: '',
      content: ''
    }
  },
  methods: {
    handleSubmitComment () {
      if (!(this.title && this.content)) {
        this.$setInfoMessage('主题和内容均需要填写')
        return
      }
      this.$emit('comment-submit', { title: this.title, content: this.content })
    },
    resetContent () {
      this.title = ''
      this.content = ''
    },
    handleTitleKey (e) {
      if (this.title && !e.isComposing && e.key === 'Enter') {
        this.$refs.content.focus()
        e.preventDefault()
      }
      if (e.shiftKey && !e.isComposing && e.key === 'Enter') {
        e.preventDefault()
        this.handleSubmitComment()
      }
    },
    handleContentKey (e) {
      if (e.shiftKey && !e.isComposing && e.key === 'Enter') {
        e.preventDefault()
        this.handleSubmitComment()
      }
    }
  }
}
</script>

<style lang="scss" scoped>
@import '~@/style/theme.scss';

.write-new-comment {
  position: relative;
}

input, textarea {
  box-sizing: border-box;
  font-size: 14px;
  color: #3a4a5a;
  border-radius: 4px;
  border: none;
  outline: none;
  width: 100%;
  height: 36px;
  line-height: 1.6;
  padding: 8px;
  transition: .2s;
  background-color: transparent;
  &:hover {
    border-color: #6a7a8a;
    transform: translateY(-1px);
  }
  &::placeholder {
    color: #9aaaba;
  }
}

input {
  border-radius: 4px 4px 0 0;
  border: 1px solid #bacada;
}

textarea {
  transform: translateY(-1px);
  border-radius: 0 0 4px 4px;
  border: 1px solid #bacada;
  min-height: 96px;
  padding-bottom: 32px;
  height: 100%;
  resize: vertical;
}

.send-button {
  position: absolute;
  bottom: 12px;
  right: 12px;
  background: white;

  &:hover {
    background: lighten($theme-green-light, 2);
  }
}
</style>