459 lines
14 KiB
Vue
459 lines
14 KiB
Vue
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<script setup lang="ts">
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import { computed, onBeforeUnmount, onMounted, reactive, ref, watch } from 'vue';
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import { useI18n } from 'vue-i18n';
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import type { PhotoSequence } from '../feed/sequence';
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import { MIN_SCALE, panBy, resetZoom, wheelFactor, zoomAt, type ZoomState } from '../viewer/zoom';
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// 大图查看器（Task 8）：browse URL 全屏展示 + 左右切换（保持列表浏览序列，越过
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// 末尾且 hasMore 时取下一页扩展）+ 滚轮/双指缩放与平移（受控 CSS transform，数学
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// 见 viewer/zoom.ts）+ 签名过期静默重取（复用 sequence.refreshPhotoUrls）。
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//
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// 状态归属：序列数据/分页在 ActivityPage 创建的 PhotoSequence（共享 composable），
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// 本组件只持视图态（缩放/平移、加载失败标记、扩展中标记）；当前照片以 photoId
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// （v-model）为准而非下标——序列追加/solo 归位/条目移除都会移动下标，photoId 键
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// 控让重排自动保持指向同一张照片。
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//
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// 手势（Pointer Events，无第三方依赖）：
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// · 双指：捏合缩放（transform 不动点 = 手势中心）+ 中点漂移平移；
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// · 单指且 scale>1：拖拽平移；scale=1：横向轻扫切换上一张/下一张；
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// · 双击（鼠标 dblclick / 触控双 tap）：复位缩放；
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// · 滚轮（无需 ctrl）：以光标为不动点缩放；Esc/关闭按钮/背景点击关闭。
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//
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// 关闭回位（滚动锚点）与 URL 同步由 ActivityPage 负责（见 ActivityPage 注释）。
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const props = defineProps<{
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sequence: PhotoSequence;
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photoId: string;
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}>();
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const emit = defineEmits<{
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'update:photoId': [photoId: string];
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/** 当前照片经刷新确认已下线（404）：neighborIndex 为移除前下标，供回退邻居。 */
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removed: [photoId: string, neighborIndex: number];
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close: [];
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}>();
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const { t } = useI18n();
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const photos = computed(() => props.sequence.photos);
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const index = computed(() => photos.value.findIndex((photo) => photo.photoId === props.photoId));
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const photo = computed(() => photos.value[index.value] ?? null);
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const total = computed(() => photos.value.length);
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const hasPrev = computed(() => index.value > 0);
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// 末张且仍有下一页 → 允许继续向右（导航触发序列扩展）。
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const hasNext = computed(() => index.value < total.value - 1 || props.sequence.hasMore);
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// —— 视图状态（按 photoId；切换照片即复位） ——
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/** 图片单次重试的缓存击穿键：重试按钮点击后 +1 强制 <img> 重挂载重触发加载。 */
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const retryCount = ref(0);
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const failedIds = reactive(new Set<string>());
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const retriedIds = reactive(new Set<string>());
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const extending = ref(false);
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watch(
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() => props.photoId,
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() => {
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failedIds.clear();
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retriedIds.clear();
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retryCount.value = 0;
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Object.assign(zoom, resetZoom());
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},
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);
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// —— 缩放/平移 ——
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const zoom = reactive<ZoomState>({ ...resetZoom() });
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const rootEl = ref<HTMLElement | null>(null);
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const imgStyle = computed(() => ({
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transform: `translate(${zoom.tx}px, ${zoom.ty}px) scale(${zoom.scale})`,
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}));
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/** 手势中心（相对图片未变换时中心的坐标）：图片经 flex 居中，未变换中心 = 容器中心。 */
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function center(): { x: number; y: number } {
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const rect = rootEl.value?.getBoundingClientRect();
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if (rect === undefined) return { x: 0, y: 0 };
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return { x: rect.left + rect.width / 2, y: rect.top + rect.height / 2 };
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}
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function onWheel(event: WheelEvent): void {
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const { x, y } = center();
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Object.assign(zoom, zoomAt({ ...zoom }, wheelFactor(event.deltaY), event.clientX - x, event.clientY - y));
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}
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function onDblClick(): void {
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Object.assign(zoom, resetZoom());
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}
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// —— 指针手势（双指捏合 / 单指平移 / 单指轻扫 / 双 tap 复位） ——
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const pointers = new Map<number, { x: number; y: number }>();
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let pinchDistance = 0;
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let pinchMid = { x: 0, y: 0 };
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let swipe: { x: number; y: number; dx: number; dy: number } | null = null;
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let lastTap = { time: 0, x: 0, y: 0 };
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/** 手势期间发生过位移：抑制手势收尾时的背景 click 误关闭。 */
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let dragged = false;
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const SWIPE_MIN_DISTANCE = 50;
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function pointerPair(): { a: { x: number; y: number }; b: { x: number; y: number } } | null {
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if (pointers.size < 2) return null;
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const [first, second] = pointers.values();
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if (first === undefined || second === undefined) return null;
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return { a: first, b: second };
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}
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function distance(a: { x: number; y: number }, b: { x: number; y: number }): number {
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return Math.hypot(a.x - b.x, a.y - b.y);
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}
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function onPointerDown(event: PointerEvent): void {
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pointers.set(event.pointerId, { x: event.clientX, y: event.clientY });
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dragged = false;
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// 触控双 tap：400ms 内同点两落 → 复位缩放。
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if (event.pointerType === 'touch' && pointers.size === 1) {
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const now = performance.now();
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if (now - lastTap.time < 400 && Math.hypot(event.clientX - lastTap.x, event.clientY - lastTap.y) < 40) {
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Object.assign(zoom, resetZoom());
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lastTap = { time: 0, x: 0, y: 0 };
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} else {
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lastTap = { time: now, x: event.clientX, y: event.clientY };
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}
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}
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const pair = pointerPair();
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if (pair !== null) {
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pinchDistance = distance(pair.a, pair.b);
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pinchMid = { x: (pair.a.x + pair.b.x) / 2, y: (pair.a.y + pair.b.y) / 2 };
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swipe = null;
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} else if (zoom.scale <= MIN_SCALE) {
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swipe = { x: event.clientX, y: event.clientY, dx: 0, dy: 0 };
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}
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}
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function onPointerMove(event: PointerEvent): void {
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const previous = pointers.get(event.pointerId);
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if (previous === undefined) return;
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const current = { x: event.clientX, y: event.clientY };
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pointers.set(event.pointerId, current);
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const pair = pointerPair();
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if (pair !== null) {
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// 双指：距离比 → 缩放因子（不动点 = 当前中点）；中点位移 → 平移。
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const nextDistance = distance(pair.a, pair.b);
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const mid = { x: (pair.a.x + pair.b.x) / 2, y: (pair.a.y + pair.b.y) / 2 };
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const { x, y } = center();
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const factor = pinchDistance > 0 ? nextDistance / pinchDistance : 1;
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Object.assign(zoom, zoomAt({ ...zoom }, factor, mid.x - x, mid.y - y));
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Object.assign(zoom, panBy({ ...zoom }, mid.x - pinchMid.x, mid.y - pinchMid.y));
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pinchDistance = nextDistance;
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pinchMid = mid;
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dragged = true;
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return;
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}
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if (zoom.scale > MIN_SCALE) {
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// 单指平移（scale>1）。
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Object.assign(zoom, panBy({ ...zoom }, current.x - previous.x, current.y - previous.y));
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dragged = true;
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} else if (swipe !== null) {
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swipe.dx = current.x - swipe.x;
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swipe.dy = current.y - swipe.y;
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if (Math.abs(swipe.dx) > 10 || Math.abs(swipe.dy) > 10) dragged = true;
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}
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}
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/** 手势结束（抬起/取消/离开全屏层）。不使用 setPointerCapture：捕获会把后续
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* click 重定向到捕获元素，按钮（关闭/切换）将收不到点击。 */
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function onPointerEnd(event: PointerEvent): void {
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pointers.delete(event.pointerId);
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if (pointers.size < 2) pinchDistance = 0;
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if (pointers.size === 1) {
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// 双指 → 单指：剩余指针重新作为平移/轻扫基线。
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const [remaining] = pointers.values();
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if (remaining !== undefined) {
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swipe = zoom.scale <= MIN_SCALE ? { x: remaining.x, y: remaining.y, dx: 0, dy: 0 } : null;
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}
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return;
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}
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if (pointers.size > 0) return;
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const gesture = swipe;
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swipe = null;
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if (gesture === null) return;
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// 以抬起坐标结算总位移（最后一帧 move 可能早于抬起点）。
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gesture.dx = event.clientX - gesture.x;
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gesture.dy = event.clientY - gesture.y;
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if (Math.abs(gesture.dx) > SWIPE_MIN_DISTANCE && Math.abs(gesture.dx) > Math.abs(gesture.dy) * 1.2) {
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if (gesture.dx < 0) void goTo(index.value + 1);
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else void goTo(index.value - 1);
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}
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}
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function onBackdropClick(): void {
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if (dragged) return; // 手势收尾的 click 不关闭
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emit('close');
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}
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// —— 键盘 ——
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function onKeydown(event: KeyboardEvent): void {
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if (event.key === 'Escape') {
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event.preventDefault();
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emit('close');
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} else if (event.key === 'ArrowLeft') {
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event.preventDefault();
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void goTo(index.value - 1);
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} else if (event.key === 'ArrowRight') {
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event.preventDefault();
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void goTo(index.value + 1);
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}
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}
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// —— 导航（保持列表浏览序列；越过末尾且 hasMore → 扩展） ——
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async function goTo(targetIndex: number): Promise<void> {
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if (targetIndex < 0 || targetIndex === index.value) return;
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if (targetIndex >= total.value) {
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if (!props.sequence.hasMore) return;
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extending.value = true;
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try {
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await props.sequence.loadMore();
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} finally {
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extending.value = false;
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}
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if (targetIndex >= photos.value.length) return; // 翻页失败/无新增：留在原处
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}
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const target = photos.value[targetIndex];
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if (target === undefined || target.photoId === props.photoId) return;
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emit('update:photoId', target.photoId);
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}
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// 相邻预取（±1 browse URL）+ 临近末尾预拉下一页，让右切更顺滑。
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watch(
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() => [props.photoId, photos.value] as const,
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() => {
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if (index.value === -1) return;
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for (const neighbor of [index.value - 1, index.value + 1]) {
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const target = photos.value[neighbor];
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if (target !== undefined) void preload(target.browse.url);
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}
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if (index.value >= photos.value.length - 2 && props.sequence.hasMore && !props.sequence.loadingMore) {
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void props.sequence.loadMore();
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}
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},
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{ immediate: true },
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);
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function preload(url: string): void {
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const img = new Image();
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img.src = url;
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}
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// —— 签名过期/下线处理 ——
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/** 大图加载失败：静默重取单图接口换新签名 URL；404 → 通知父级移除；其他失败可重试。 */
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async function onImgError(): Promise<void> {
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const current = photo.value;
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if (current === null) return;
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const { photoId } = current;
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if (retriedIds.has(photoId)) {
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failedIds.add(photoId);
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return;
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}
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retriedIds.add(photoId);
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const neighborIndex = index.value;
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const result = await props.sequence.refreshPhotoUrls(photoId);
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if (result === 'replaced') return; // 新签名 URL 换绑后 <img> 自动重载
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if (result === 'removed') {
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if (props.photoId === photoId) emit('removed', photoId, neighborIndex);
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return;
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}
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failedIds.add(photoId); // 网络等其他失败：收起图片，展示可重试占位
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}
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function retryFailed(): void {
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const current = photo.value;
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if (current === null) return;
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failedIds.delete(current.photoId);
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retriedIds.delete(current.photoId);
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retryCount.value += 1; // 强制 <img> 重挂载，重新触发加载/错误链
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}
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onMounted(() => {
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window.addEventListener('keydown', onKeydown);
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});
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onBeforeUnmount(() => {
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window.removeEventListener('keydown', onKeydown);
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});
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</script>
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<template>
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<div
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v-if="photo !== null"
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ref="rootEl"
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class="lightbox"
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role="dialog"
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aria-modal="true"
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:aria-label="t('viewer.title')"
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@wheel.prevent="onWheel"
|
|||
|
|
@pointerdown="onPointerDown"
|
|||
|
|
@pointermove="onPointerMove"
|
|||
|
|
@pointerup="onPointerEnd"
|
|||
|
|
@pointercancel="onPointerEnd"
|
|||
|
|
@pointerleave="onPointerEnd"
|
|||
|
|
@dblclick="onDblClick"
|
|||
|
|
>
|
|||
|
|
<div class="backdrop" @click="onBackdropClick" />
|
|||
|
|
|
|||
|
|
<img
|
|||
|
|
v-if="!failedIds.has(photo.photoId)"
|
|||
|
|
:key="`${photo.photoId}:${retryCount}`"
|
|||
|
|
class="photo"
|
|||
|
|
:src="photo.browse.url"
|
|||
|
|
:alt="t('route.photoLabel')"
|
|||
|
|
:style="imgStyle"
|
|||
|
|
draggable="false"
|
|||
|
|
@error="onImgError"
|
|||
|
|
>
|
|||
|
|
<div v-else class="img-failed" role="alert">
|
|||
|
|
<p>{{ t('viewer.loadFailed') }}</p>
|
|||
|
|
<button type="button" @click="retryFailed">{{ t('album.retry') }}</button>
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
<header class="bar">
|
|||
|
|
<span class="counter">{{ t('viewer.counter', { current: index + 1, total }) }}</span>
|
|||
|
|
<span class="likes">{{ t('viewer.likeCount', { count: photo.likeCount }) }}</span>
|
|||
|
|
<!-- P4a 预留：下载 / 分享操作位（P1b 不实现）。 -->
|
|||
|
|
<button type="button" class="control close" :aria-label="t('viewer.close')" @click="emit('close')">
|
|||
|
|
✕
|
|||
|
|
</button>
|
|||
|
|
</header>
|
|||
|
|
|
|||
|
|
<button
|
|||
|
|
type="button"
|
|||
|
|
class="control nav prev"
|
|||
|
|
:disabled="!hasPrev"
|
|||
|
|
:aria-label="t('viewer.previous')"
|
|||
|
|
@click="goTo(index - 1)"
|
|||
|
|
>
|
|||
|
|
‹
|
|||
|
|
</button>
|
|||
|
|
<button
|
|||
|
|
type="button"
|
|||
|
|
class="control nav next"
|
|||
|
|
:disabled="!hasNext"
|
|||
|
|
:aria-label="t('viewer.next')"
|
|||
|
|
@click="goTo(index + 1)"
|
|||
|
|
>
|
|||
|
|
›
|
|||
|
|
</button>
|
|||
|
|
|
|||
|
|
<p v-if="extending" class="loading">{{ t('album.loading') }}</p>
|
|||
|
|
</div>
|
|||
|
|
</template>
|
|||
|
|
|
|||
|
|
<style scoped>
|
|||
|
|
/* 极简基线样式：视觉打磨留待 P4a。 */
|
|||
|
|
.lightbox {
|
|||
|
|
position: fixed;
|
|||
|
|
inset: 0;
|
|||
|
|
z-index: 100;
|
|||
|
|
display: flex;
|
|||
|
|
align-items: center;
|
|||
|
|
justify-content: center;
|
|||
|
|
touch-action: none;
|
|||
|
|
user-select: none;
|
|||
|
|
}
|
|||
|
|
.backdrop {
|
|||
|
|
position: absolute;
|
|||
|
|
inset: 0;
|
|||
|
|
background: rgba(17, 24, 39, 0.92);
|
|||
|
|
}
|
|||
|
|
.photo {
|
|||
|
|
position: relative;
|
|||
|
|
max-width: 100%;
|
|||
|
|
max-height: 100%;
|
|||
|
|
object-fit: contain;
|
|||
|
|
transform-origin: center;
|
|||
|
|
will-change: transform;
|
|||
|
|
}
|
|||
|
|
.img-failed {
|
|||
|
|
position: relative;
|
|||
|
|
color: #f3f4f6;
|
|||
|
|
text-align: center;
|
|||
|
|
}
|
|||
|
|
.img-failed button {
|
|||
|
|
margin-top: 8px;
|
|||
|
|
border: 1px solid #4b5563;
|
|||
|
|
border-radius: 6px;
|
|||
|
|
background: transparent;
|
|||
|
|
color: #e5e7eb;
|
|||
|
|
padding: 4px 12px;
|
|||
|
|
cursor: pointer;
|
|||
|
|
}
|
|||
|
|
.bar {
|
|||
|
|
position: absolute;
|
|||
|
|
top: 0;
|
|||
|
|
left: 0;
|
|||
|
|
right: 0;
|
|||
|
|
display: flex;
|
|||
|
|
align-items: center;
|
|||
|
|
gap: 16px;
|
|||
|
|
padding: 10px 16px;
|
|||
|
|
color: #f9fafb;
|
|||
|
|
background: linear-gradient(rgba(0, 0, 0, 0.45), transparent);
|
|||
|
|
}
|
|||
|
|
.counter {
|
|||
|
|
font-variant-numeric: tabular-nums;
|
|||
|
|
}
|
|||
|
|
.likes {
|
|||
|
|
color: #d1d5db;
|
|||
|
|
font-size: 0.875rem;
|
|||
|
|
}
|
|||
|
|
.control {
|
|||
|
|
border: none;
|
|||
|
|
background: rgba(17, 24, 39, 0.55);
|
|||
|
|
color: #f9fafb;
|
|||
|
|
cursor: pointer;
|
|||
|
|
}
|
|||
|
|
.control:disabled {
|
|||
|
|
opacity: 0.35;
|
|||
|
|
cursor: default;
|
|||
|
|
}
|
|||
|
|
.control.close {
|
|||
|
|
margin-left: auto;
|
|||
|
|
font-size: 1.1rem;
|
|||
|
|
border-radius: 6px;
|
|||
|
|
padding: 4px 10px;
|
|||
|
|
}
|
|||
|
|
.control.nav {
|
|||
|
|
position: absolute;
|
|||
|
|
top: 50%;
|
|||
|
|
transform: translateY(-50%);
|
|||
|
|
font-size: 2rem;
|
|||
|
|
line-height: 1;
|
|||
|
|
border-radius: 999px;
|
|||
|
|
width: 44px;
|
|||
|
|
height: 44px;
|
|||
|
|
}
|
|||
|
|
.control.nav.prev {
|
|||
|
|
left: 12px;
|
|||
|
|
}
|
|||
|
|
.control.nav.next {
|
|||
|
|
right: 12px;
|
|||
|
|
}
|
|||
|
|
.loading {
|
|||
|
|
position: absolute;
|
|||
|
|
bottom: 16px;
|
|||
|
|
left: 50%;
|
|||
|
|
transform: translateX(-50%);
|
|||
|
|
margin: 0;
|
|||
|
|
color: #d1d5db;
|
|||
|
|
}
|
|||
|
|
</style>
|