278 lines
8.6 KiB
Vue
278 lines
8.6 KiB
Vue
<!-- =====================================================================
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FilePreviewDrawer.vue — 附件右侧抽屉预览
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图片/视频直接 ObjectURL 预览；PDF/DOCX 提取文本；MD 走 renderMd；
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其余类型展示元数据和下载。双击内容或点击放大按钮可占满窗口。
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===================================================================== -->
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<script setup lang="ts">
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import { computed, ref, onMounted, onBeforeUnmount, watch } from 'vue'
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import { attachmentState, closePreview, downloadAttachment, getAttachment, loadPreviewText } from '../../core/attachments'
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import { renderMd } from '../../core/markdown'
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import Icon from './Icon.vue'
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const activeAttachment = computed(() => getAttachment(attachmentState.activeId.value))
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const renderedMarkdown = computed(() => renderMd(activeAttachment.value?.text || ''))
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/* 媒体 ObjectURL：每个附件只创建一份，切换/关闭/卸载时统一回收，防泄漏 */
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const mediaUrl = ref('')
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function revokeMedia() {
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if (mediaUrl.value) { URL.revokeObjectURL(mediaUrl.value); mediaUrl.value = '' }
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}
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watch(() => attachmentState.activeId.value, () => {
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revokeMedia()
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const att = activeAttachment.value
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if (att && (att.kind === 'image' || att.kind === 'video')) {
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mediaUrl.value = URL.createObjectURL(att.file)
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}
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void loadPreviewText(att)
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}, { immediate: true })
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onBeforeUnmount(revokeMedia)
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function toggleMaximize() {
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attachmentState.maximized.value = !attachmentState.maximized.value
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}
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function onKeydown(e: KeyboardEvent) {
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if (e.key === 'Escape') {
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if (attachmentState.maximized.value) attachmentState.maximized.value = false
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else closePreview()
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}
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}
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onMounted(() => document.addEventListener('keydown', onKeydown))
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onBeforeUnmount(() => document.removeEventListener('keydown', onKeydown))
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</script>
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<template>
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<Teleport to="body">
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<div
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v-if="activeAttachment"
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class="file-preview-mask"
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:class="{ maximized: attachmentState.maximized.value }"
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>
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<aside class="file-preview-drawer" role="dialog" aria-modal="true" :aria-label="`${activeAttachment.name} 预览`">
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<header class="file-preview-head">
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<div class="file-preview-title" :title="activeAttachment.name">
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<span class="file-preview-title-icon"><Icon name="paperclip" :size="14" /></span>
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<span>{{ activeAttachment.name }}</span>
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</div>
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<div class="file-preview-actions">
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<button class="file-preview-btn" :title="attachmentState.maximized.value ? '退出放大' : '放大预览'" @click="toggleMaximize">
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{{ attachmentState.maximized.value ? '↙' : '↗' }}
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</button>
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<button class="file-preview-btn close" title="关闭预览" @click="closePreview">×</button>
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</div>
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</header>
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<main class="file-preview-body" @dblclick="toggleMaximize">
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<!-- 图片 -->
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<img
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v-if="activeAttachment.kind === 'image'"
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class="file-preview-image"
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:src="mediaUrl"
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:alt="activeAttachment.name"
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/>
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<!-- 视频 -->
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<video
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v-else-if="activeAttachment.kind === 'video'"
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class="file-preview-video"
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:src="mediaUrl"
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controls
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>你的浏览器不支持视频预览。</video>
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<!-- Markdown -->
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<article
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v-else-if="activeAttachment.kind === 'markdown' && activeAttachment.textState === 'done'"
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class="file-preview-markdown"
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v-html="renderedMarkdown"
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/>
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<!-- PDF / DOC / TXT：统一纯文本阅读 -->
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<pre
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v-else-if="(activeAttachment.kind === 'pdf' || activeAttachment.kind === 'doc' || activeAttachment.kind === 'text') && activeAttachment.textState === 'done'"
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class="file-preview-text"
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>{{ activeAttachment.text }}</pre>
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<!-- 文本加载 / 错误 -->
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<div v-else-if="activeAttachment.textState === 'loading'" class="file-preview-status">正在提取文件内容…</div>
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<div v-else-if="activeAttachment.textState === 'error'" class="file-preview-status error">
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预览读取失败：{{ activeAttachment.textError }}
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</div>
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<!-- 无结构化预览的文件 -->
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<div v-else class="file-preview-meta">
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<span class="file-preview-meta-icon"><Icon name="paperclip" :size="12" /></span>
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<strong>{{ activeAttachment.name }}</strong>
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<span>{{ activeAttachment.file.type || '未知文件类型' }}</span>
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<span>{{ activeAttachment.size.toLocaleString() }} B</span>
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<button class="file-preview-download" @click="downloadAttachment(activeAttachment)">下载文件</button>
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</div>
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</main>
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<footer class="file-preview-foot">
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<span>{{ activeAttachment.file.type || '未知类型' }}</span>
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<button class="file-preview-download link" @click="downloadAttachment(activeAttachment)">下载</button>
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</footer>
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</aside>
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</div>
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</Teleport>
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</template>
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<style scoped>
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.file-preview-mask {
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position: fixed;
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inset: 0;
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z-index: 80;
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pointer-events: none;
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}
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.file-preview-drawer {
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position: absolute;
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top: 0;
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right: 0;
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width: min(480px, 100vw);
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height: 100%;
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display: flex;
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flex-direction: column;
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background: var(--ui-panel);
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border-left: 1px solid var(--ui-border);
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box-shadow: var(--shadow-lg);
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pointer-events: auto;
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animation: drawer-enter .18s ease-out;
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}
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.file-preview-mask.maximized .file-preview-drawer {
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width: 100vw;
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border-left: none;
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}
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@keyframes drawer-enter {
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from { transform: translateX(28px); opacity: 0; }
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to { transform: translateX(0); opacity: 1; }
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}
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.file-preview-head,
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.file-preview-foot {
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display: flex;
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align-items: center;
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gap: 8px;
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flex: 0 0 auto;
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padding: 10px 12px;
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border-bottom: 1px solid var(--ui-border);
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}
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.file-preview-title {
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display: flex;
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align-items: center;
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min-width: 0;
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gap: 7px;
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flex: 1;
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color: var(--ui-text);
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font-size: 14px;
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font-weight: 600;
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}
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.file-preview-title span:last-child {
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overflow: hidden;
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white-space: nowrap;
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text-overflow: ellipsis;
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}
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.file-preview-title-icon { font-size: 17px; }
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.file-preview-actions { display: flex; gap: 4px; }
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.file-preview-btn {
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width: 28px;
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height: 28px;
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border: none;
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border-radius: var(--radius-sm);
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background: transparent;
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color: var(--ui-muted);
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font-size: 18px;
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line-height: 1;
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cursor: pointer;
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}
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.file-preview-btn:hover { background: var(--ui-hover); color: var(--ui-text); }
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.file-preview-btn.close:hover { color: var(--ui-danger); }
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.file-preview-body {
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flex: 1;
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min-height: 0;
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overflow: auto;
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padding: 16px;
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background: var(--ui-bg);
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}
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.file-preview-image,
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.file-preview-video {
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display: block;
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width: 100%;
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max-height: 100%;
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object-fit: contain;
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margin: auto;
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}
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.file-preview-image { min-height: 200px; }
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.file-preview-text {
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margin: 0;
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white-space: pre-wrap;
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overflow-wrap: anywhere;
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color: var(--ui-text);
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font: 13px/1.7 var(--mono);
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}
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.file-preview-markdown {
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color: var(--ui-text);
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font-size: 14px;
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line-height: 1.7;
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overflow-wrap: anywhere;
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}
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.file-preview-markdown :deep(h1),
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.file-preview-markdown :deep(h2),
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.file-preview-markdown :deep(h3) { margin: 1.1em 0 .5em; }
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.file-preview-markdown :deep(p),
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.file-preview-markdown :deep(ul),
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.file-preview-markdown :deep(ol) { margin: .6em 0; }
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.file-preview-markdown :deep(pre) {
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padding: 10px;
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overflow: auto;
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background: #0f172a;
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color: #e2e8f0;
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border-radius: var(--radius-sm);
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}
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.file-preview-markdown :deep(code) { font-family: var(--mono); }
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.file-preview-status {
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display: grid;
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place-items: center;
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height: 100%;
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color: var(--ui-muted);
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font-size: 14px;
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text-align: center;
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}
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.file-preview-status.error { color: var(--ui-danger); }
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.file-preview-meta {
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display: flex;
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flex-direction: column;
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align-items: center;
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justify-content: center;
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gap: 10px;
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min-height: 100%;
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color: var(--ui-muted);
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font-size: 13px;
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text-align: center;
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}
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.file-preview-meta strong { color: var(--ui-text); overflow-wrap: anywhere; }
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.file-preview-meta-icon { font-size: 44px; }
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.file-preview-download {
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padding: 7px 12px;
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border: 1px solid var(--ui-primary);
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border-radius: var(--radius-sm);
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background: var(--ui-primary);
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color: #fff;
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font-size: 13px;
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cursor: pointer;
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}
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.file-preview-download:hover { filter: brightness(.94); }
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.file-preview-foot {
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justify-content: space-between;
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border-top: 1px solid var(--ui-border);
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border-bottom: none;
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color: var(--ui-muted);
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font-size: 12px;
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}
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.file-preview-download.link {
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padding: 3px 6px;
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border: none;
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background: transparent;
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color: var(--ui-primary);
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}
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</style>
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