wx/src/views/chat/ChatModeSelector.vue

<template>
  <div class="mode-selector">
    <div class="mode-header">
      <h3 class="mode-title">对话场景</h3>
      <el-dropdown trigger="hover" @command="handleHistorySelect">
        <el-button class="history-btn" :icon="Document" text bg>
          历史会话
        </el-button>
        <template #dropdown>
          <el-dropdown-menu>
            <template v-if="currentModeHistory.length">
              <el-dropdown-item 
                v-for="chat in currentModeHistory" 
                :key="chat.conversationId"
                :command="chat.conversationId"
                class="history-item"
              >
                <div class="history-content">
                  <span class="history-title">{{ formatChatTitle(chat) }}</span>
                  <el-button
                    class="delete-btn"
                    :icon="Delete"
                    link
                    @click.stop="handleDelete(chat.conversationId)"
                  />
                </div>
              </el-dropdown-item>
            </template>
            <el-dropdown-item v-else disabled>暂无历史会话</el-dropdown-item>
          </el-dropdown-menu>
        </template>
      </el-dropdown>
    </div>
    <div class="mode-list">
      <div
        v-for="mode in chatModes"
        :key="mode.id"
        :class="['mode-item', { active: chatStore.currentMode === mode.id }]"
        @click="selectMode(mode.id)"
      >
        <i :class="mode.icon"></i>
        <span>{{ mode.name }}</span>
      </div>
    </div>
  </div>
</template>

<script setup>
import { useChatStore } from '@/store/chat'
import { computed, ref } from 'vue'
import { Document, Delete } from '@element-plus/icons-vue'
import { ElDropdown, ElDropdownMenu, ElDropdownItem, ElButton, ElMessageBox } from 'element-plus'

const chatStore = useChatStore()

const chatModes = computed(() => {
  return Object.keys(chatStore.chatModes).map(key => ({
    id: key,
    name: chatStore.chatModes[key].name,
    icon: chatStore.chatModes[key].icon
  }))
})

// 获取当前模式下的历史会话
const currentModeHistory = computed(() => {
  return chatStore.conversations.filter(chat => chat.mode === chatStore.currentMode)
})

// 格式化会话标题
const formatChatTitle = (chat) => {
  // 使用第一条消息作为标题，如果没有则使用默认标题
  if (chat.messages && chat.messages.length > 0) {
    const firstMessage = chat.messages[0].question
    return firstMessage.length > 20 ? firstMessage.substring(0, 20) + '...' : firstMessage
  }
  return `会话 ${chat.conversationId.substring(0, 8)}`
}

const selectMode = (modeId) => {
  chatStore.setCurrentMode(modeId)
}

const handleHistorySelect = (conversationId) => {
  chatStore.switchConversation(conversationId)
}

const handleDelete = async (conversationId) => {
  try {
    await ElMessageBox.confirm(
      '确定要删除这个会话吗？删除后无法恢复。',
      '删除确认',
      {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning',
      }
    )
    chatStore.deleteConversation(conversationId)
  } catch {
    // 用户取消删除
  }
}
</script>

<style lang="scss" scoped>
$primary-color: #4CAF50;
$text-color: #333;
$text-color-dark: #fff;
$background-color: #ffffff;
$background-color-dark: #1e1e1e;
$border-color: #e0e0e0;
$border-color-dark: #333;
$hover-color: #f5f5f5;
$hover-color-dark: #2d2d2d;

.mode-selector {
  width: 240px;
  min-width: 240px;
  background: $background-color;
  border-right: 1px solid $border-color;
  height: 100%;
  padding: 20px 0;
  box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);

  .mode-header {
    padding: 0 20px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;

    .mode-title {
      color: $text-color;
      font-size: 16px;
      font-weight: bold;
      margin: 0;
    }

    .history-btn {
      font-size: 14px;
      height: 32px;
      padding: 4px 12px;
      color: $text-color;
      transition: all 0.3s ease;
      
      &:hover {
        color: $primary-color;
        background: rgba($primary-color, 0.1);
      }

      &:focus-visible {
        outline: none;
        box-shadow: none;
      }

      &:focus {
        outline: none;
        box-shadow: none;
      }

      :deep(.el-icon) {
        font-size: 16px;
        margin-right: 4px;
      }
    }
  }

  .mode-list {
    display: flex;
    flex-direction: column;
    gap: 5px;
  }

  .mode-item {
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    color: $text-color;

    &:hover {
      background: $hover-color;
    }

    &.active {
      background: $primary-color;
      color: white;
    }

    i {
      font-size: 18px;
      width: 24px;
      text-align: center;
    }

    span {
      font-size: 14px;
    }
  }
}

:deep(.el-dropdown-menu__item) {
  font-size: 13px;
  padding: 8px 16px;
  line-height: 1.4;
  max-width: 300px;
  overflow-x: hidden;

  &:hover .delete-btn {
    opacity: 1;
    transform: translateX(0);
  }
}

:deep(.el-dropdown-menu) {
  min-width: 200px;
  max-width: 300px;
}

.history-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  position: relative;
  min-width: 0;
}

.history-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-right: 24px;
  min-width: 0;
}

.delete-btn {
  position: absolute;
  right: -8px;
  opacity: 0;
  transform: translateX(10px);
  transition: all 0.3s ease;
  height: 24px;
  width: 24px;
  padding: 0;
  color: #f56c6c;
  flex-shrink: 0;
  
  &:hover {
    color: #f56c6c;
    background-color: rgba(245, 108, 108, 0.1);
  }
  
  :deep(.el-icon) {
    font-size: 14px;
  }
}

@media (prefers-color-scheme: dark) {
  .mode-selector {
    background: $background-color-dark;
    border-right-color: $border-color-dark;

    .mode-title {
      color: $text-color-dark;
    }

    .mode-item {
      color: $text-color-dark;

      &:hover {
        background: $hover-color-dark;
      }
    }

    .history-btn {
      color: $text-color-dark;
      
      &:hover {
        color: $primary-color;
        background: rgba($primary-color, 0.15);
      }
    }
  }

  .delete-btn {
    &:hover {
      background-color: rgba(245, 108, 108, 0.15);
    }
  }
}
</style>