front/src/components/InvitePoster.vue

<script lang="ts" setup>
import { onMounted, onBeforeUnmount, ref, watch } from 'vue';
import { useI18n } from 'vue-i18n';
import { Message } from '@arco-design/web-vue';
import { buildInvitePosterDataUrl } from '@/utils/invitePoster';

defineOptions({ name: 'InvitePoster' });

const props = withDefaults(
  defineProps<{
    value: string;
    inviteCode?: string;
    /** 展示宽度（高度按海报比例自适应） */
    displayWidth?: number | string;
    showDownload?: boolean;
    alt?: string;
  }>(),
  {
    inviteCode: '',
    displayWidth: '100%',
    showDownload: true,
    alt: 'invite-poster',
  },
);

const emit = defineEmits<{
  ready: [dataUrl: string];
  fail: [];
}>();

const { t } = useI18n();
const dataUrl = ref('');
const loading = ref(false);
const failed = ref(false);
let renderSeq = 0;

async function render() {
  const seq = ++renderSeq;
  failed.value = false;
  dataUrl.value = '';
  if (!props.value) return;
  loading.value = true;
  try {
    const url = await buildInvitePosterDataUrl({
      inviteUrl: props.value,
      inviteCode: props.inviteCode,
    });
    if (seq !== renderSeq) return;
    dataUrl.value = url;
    emit('ready', url);
  } catch {
    if (seq !== renderSeq) return;
    failed.value = true;
    emit('fail');
  } finally {
    if (seq === renderSeq) {
      loading.value = false;
    }
  }
}

function downloadPoster() {
  if (!dataUrl.value) return;
  const a = document.createElement('a');
  a.href = dataUrl.value;
  a.download = 'invite-poster.jpg';
  a.rel = 'noopener';
  document.body.appendChild(a);
  a.click();
  a.remove();
  Message.success(t('h5.invite.posterSaved'));
}

onMounted(() => {
  void render();
});

onBeforeUnmount(() => {
  renderSeq += 1;
});

watch(
  () => [props.value, props.inviteCode] as const,
  () => {
    void render();
  },
);

defineExpose({
  getDataUrl: () => dataUrl.value,
  refresh: render,
  download: downloadPoster,
});
</script>

<template>
  <div class="invite-poster">
    <div v-if="loading" class="invite-poster__loading">
      <a-spin :size="28" />
      <p>{{ t('h5.invite.posterLoading') }}</p>
    </div>
    <template v-else-if="dataUrl">
      <img
        :src="dataUrl"
        :alt="alt"
        class="invite-poster__img"
        :style="{ width: typeof displayWidth === 'number' ? `${displayWidth}px` : displayWidth }"
      />
      <button
        v-if="showDownload"
        type="button"
        class="invite-poster__save"
        @click="downloadPoster"
      >
        {{ t('h5.invite.savePoster') }}
      </button>
      <p class="invite-poster__tip">{{ t('h5.invite.posterTip') }}</p>
    </template>
    <div v-else-if="failed" class="invite-poster__fail">
      <p>{{ t('h5.invite.posterFailed') }}</p>
      <button type="button" class="invite-poster__retry" @click="render">
        {{ t('h5.invite.posterRetry') }}
      </button>
    </div>
  </div>
</template>

<style scoped lang="less">
.invite-poster {
  text-align: center;
}

.invite-poster__img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 0 auto;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(8, 52, 115, 0.14);
  background: var(--app-card-bg);
}

.invite-poster__loading,
.invite-poster__fail {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 160px;
  padding: 28px 12px;
  font-size: 13px;
  color: var(--color-text-3);
}

.invite-poster__loading p,
.invite-poster__fail p {
  margin: 0;
}

.invite-poster__retry {
  height: 32px;
  padding: 0 14px;
  border: 1px solid color-mix(in srgb, var(--app-primary-color) 35%, var(--color-border-2));
  border-radius: 8px;
  background: var(--app-card-bg);
  color: var(--app-primary-color);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.invite-poster__save {
  margin-top: 12px;
  height: 36px;
  padding: 0 18px;
  border: none;
  border-radius: 10px;
  background: var(--app-primary-color);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}

.invite-poster__tip {
  margin: 10px 0 0;
  font-size: 12px;
  color: var(--color-text-3);
  line-height: 1.5;
}
</style>