mirror of
https://github.com/moku-project/Moku.git
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Youwes09
492 lines
17 KiB
Svelte
492 lines
17 KiB
Svelte
<script lang="ts">
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import { CircleNotch } from "phosphor-svelte";
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import { store } from "@store/state.svelte";
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import { readerState } from "../store/readerState.svelte";
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import type { StripChapter } from "../lib/scrollHandler";
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import { createPinchTracker } from "../lib/pinchZoom";
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import type { PinchTracker } from "../lib/pinchZoom";
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interface Props {
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style: string;
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imgCls: string;
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effectiveWidth: number | undefined;
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loading: boolean;
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error: string | null;
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pageReady: boolean;
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pageGroups: number[][];
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currentGroup: number[];
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stripToRender: StripChapter[];
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fadingOut: boolean;
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tapToToggleBar: boolean;
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pinchZoomEnabled: boolean;
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chapterEpoch: number;
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onGetZoom: () => number;
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onSetZoom: (z: number) => void;
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resolveUrl: (url: string, priority?: number) => Promise<string>;
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onTap: (e: MouseEvent) => void;
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onWheel: (e: WheelEvent) => void;
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onToggleUi: () => void;
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bindContainer: (el: HTMLDivElement) => void;
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}
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const {
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style, imgCls, effectiveWidth, loading, error, pageReady,
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pageGroups, currentGroup, stripToRender, fadingOut,
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tapToToggleBar, pinchZoomEnabled, chapterEpoch, onGetZoom, onSetZoom,
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resolveUrl, onTap, onWheel, onToggleUi, bindContainer,
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}: Props = $props();
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const LOAD_RADIUS = 5;
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const UNLOAD_RADIUS = 10;
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type FlatPage = { chapterId: number; chapterName: string; localIndex: number; url: string; total: number };
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const flatPages = $derived.by<FlatPage[]>(() => {
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const out: FlatPage[] = [];
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for (const chunk of stripToRender) {
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for (let i = 0; i < chunk.urls.length; i++) {
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out.push({ chapterId: chunk.chapterId, chapterName: chunk.chapterName, localIndex: i, url: chunk.urls[i], total: chunk.urls.length });
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}
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}
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return out;
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});
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let loadedSet = $state(new Set<number>());
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let resolvedSrc = $state<Record<number, string>>({});
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let revokeQueue: string[] = [];
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let observer: IntersectionObserver | null = null;
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const elementIndex = new Map<Element, number>();
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let viewportCenter = $state(0);
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function scheduleRevoke(src: string) {
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if (!src || !src.startsWith("blob:")) return;
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revokeQueue.push(src);
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requestAnimationFrame(() => {
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const url = revokeQueue.shift();
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if (url) {
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try { URL.revokeObjectURL(url); } catch { }
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}
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});
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}
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function loadPage(idx: number) {
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if (loadedSet.has(idx)) return;
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const page = flatPages[idx];
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if (!page) return;
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const newSet = new Set(loadedSet);
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newSet.add(idx);
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loadedSet = newSet;
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const priority = (page.localIndex < 8 && page.chapterId === flatPages[0]?.chapterId) ? 8 - page.localIndex : 0;
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resolveUrl(page.url, priority).then(src => {
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if (loadedSet.has(idx)) {
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resolvedSrc = { ...resolvedSrc, [idx]: src };
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} else {
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scheduleRevoke(src);
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}
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});
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}
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function unloadPage(idx: number) {
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if (!loadedSet.has(idx)) return;
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const newSet = new Set(loadedSet);
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newSet.delete(idx);
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loadedSet = newSet;
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const oldSrc = resolvedSrc[idx];
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if (oldSrc) {
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const next = { ...resolvedSrc };
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delete next[idx];
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resolvedSrc = next;
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scheduleRevoke(oldSrc);
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}
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}
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function recalcWindow() {
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const center = viewportCenter;
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const lo = center - LOAD_RADIUS;
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const hi = center + LOAD_RADIUS;
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const evictLo = center - UNLOAD_RADIUS;
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const evictHi = center + UNLOAD_RADIUS;
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for (let i = 0; i < flatPages.length; i++) {
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if (i >= lo && i <= hi) {
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loadPage(i);
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} else if (i < evictLo || i > evictHi) {
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unloadPage(i);
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}
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}
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}
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$effect(() => {
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void viewportCenter;
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recalcWindow();
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});
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$effect(() => {
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void flatPages.length;
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recalcWindow();
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});
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function setupObserver(containerEl: HTMLElement) {
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observer?.disconnect();
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elementIndex.clear();
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observer = new IntersectionObserver(
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(entries) => {
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let best = -1;
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let bestRatio = -1;
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for (const entry of entries) {
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const idx = elementIndex.get(entry.target);
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if (idx === undefined) continue;
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if (entry.isIntersecting && entry.intersectionRatio > bestRatio) {
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bestRatio = entry.intersectionRatio;
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best = idx;
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}
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}
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if (best >= 0 && best !== viewportCenter) {
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viewportCenter = best;
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}
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},
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{
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root: containerEl,
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rootMargin: "0px",
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threshold: [0, 0.1, 0.5, 1.0],
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}
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);
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}
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function observePage(el: HTMLDivElement, idx: number) {
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elementIndex.set(el, idx);
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observer?.observe(el);
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return {
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update(newIdx: number) {
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elementIndex.set(el, newIdx);
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},
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destroy() {
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observer?.unobserve(el);
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elementIndex.delete(el);
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}
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};
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}
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$effect(() => {
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void chapterEpoch;
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loadedSet = new Set<number>();
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resolvedSrc = {};
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const resume = readerState.resumePage;
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viewportCenter = resume > 1 ? resume - 1 : 0;
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});
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const INSPECT_ZOOM_STEP = 0.15;
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const INSPECT_ZOOM_MAX = 8;
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let containerEl: HTMLDivElement;
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function getInspectImageEl(): HTMLElement | null {
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if (!containerEl) return null;
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return (
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containerEl.querySelector<HTMLElement>(".inspect-wrap .double-wrap") ??
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containerEl.querySelector<HTMLElement>(".inspect-wrap img")
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);
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}
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function clampInspectPan(scale: number, px: number, py: number): [number, number] {
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const img = getInspectImageEl();
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if (!img) return [px, py];
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const maxX = Math.max(0, (img.offsetWidth * (scale - 1)) / 2);
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const maxY = Math.max(0, (img.offsetHeight * (scale - 1)) / 2);
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return [Math.max(-maxX, Math.min(maxX, px)), Math.max(-maxY, Math.min(maxY, py))];
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}
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let inspectDragging = false;
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let inspectDragMoved = false;
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let inspectDragStartX = 0;
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let inspectDragStartY = 0;
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let inspectPanStartX = 0;
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let inspectPanStartY = 0;
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let stripDragging = $state(false);
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let stripDragMoved = false;
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let stripDragStartY = 0;
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let stripScrollStart = 0;
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let pinch: PinchTracker | null = null;
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$effect(() => {
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if (pinchZoomEnabled) {
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pinch = createPinchTracker({
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getZoom: onGetZoom,
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setZoom: onSetZoom,
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getInspectScale: () => readerState.inspectScale,
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setInspectScale: (s) => { readerState.inspectScale = s; },
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resetInspectPan: () => { readerState.inspectPanX = 0; readerState.inspectPanY = 0; },
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isLongstrip: () => style === "longstrip",
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});
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} else {
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pinch = null;
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}
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});
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export function onInspectMouseDown(e: MouseEvent) {
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if ((e.target as Element).closest(".bar")) return;
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if (style === "longstrip") {
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stripDragging = true;
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stripDragMoved = false;
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stripDragStartY = e.clientY;
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stripScrollStart = containerEl?.scrollTop ?? 0;
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e.preventDefault();
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return;
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}
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if (readerState.inspectScale <= 1) return;
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inspectDragging = true;
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inspectDragMoved = false;
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inspectDragStartX = e.clientX;
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inspectDragStartY = e.clientY;
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inspectPanStartX = readerState.inspectPanX;
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inspectPanStartY = readerState.inspectPanY;
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e.preventDefault();
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}
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export function onInspectMouseMove(e: MouseEvent) {
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if (stripDragging) {
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const dy = e.clientY - stripDragStartY;
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if (!stripDragMoved && Math.abs(dy) > 4) stripDragMoved = true;
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if (containerEl) containerEl.scrollTop = stripScrollStart - dy;
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return;
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}
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if (!inspectDragging) return;
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if (!inspectDragMoved && Math.abs(e.clientX - inspectDragStartX) + Math.abs(e.clientY - inspectDragStartY) > 4) inspectDragMoved = true;
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const rawX = inspectPanStartX + (e.clientX - inspectDragStartX);
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const rawY = inspectPanStartY + (e.clientY - inspectDragStartY);
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const [cx, cy] = clampInspectPan(readerState.inspectScale, rawX, rawY);
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readerState.inspectPanX = cx;
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readerState.inspectPanY = cy;
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}
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export function onInspectMouseUp() {
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stripDragging = false;
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inspectDragging = false;
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}
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export function onPointerDown(e: PointerEvent) {
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if ((e.target as Element).closest(".bar")) return;
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pinch?.onPointerDown(e);
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}
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export function onPointerMove(e: PointerEvent) {
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if (pinch?.isPinching()) {
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pinch.onPointerMove(e);
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return;
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}
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if (stripDragging) {
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const dy = e.clientY - stripDragStartY;
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if (!stripDragMoved && Math.abs(dy) > 4) stripDragMoved = true;
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if (containerEl) containerEl.scrollTop = stripScrollStart - dy;
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}
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if (inspectDragging) {
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if (!inspectDragMoved && Math.abs(e.clientX - inspectDragStartX) + Math.abs(e.clientY - inspectDragStartY) > 4) inspectDragMoved = true;
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const rawX = inspectPanStartX + (e.clientX - inspectDragStartX);
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const rawY = inspectPanStartY + (e.clientY - inspectDragStartY);
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const [cx, cy] = clampInspectPan(readerState.inspectScale, rawX, rawY);
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readerState.inspectPanX = cx;
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readerState.inspectPanY = cy;
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}
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}
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export function onPointerUp(e: PointerEvent) {
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pinch?.onPointerUp(e);
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if (!pinch?.isPinching()) {
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stripDragging = false;
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inspectDragging = false;
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}
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}
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export function handleWheel(e: WheelEvent) {
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if (style === "longstrip") {
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if (e.ctrlKey) { onWheel(e); }
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return;
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}
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if (!e.ctrlKey) { onWheel(e); return; }
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e.preventDefault();
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const delta = e.deltaY < 0 ? INSPECT_ZOOM_STEP : -INSPECT_ZOOM_STEP;
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const next = Math.max(1, Math.min(INSPECT_ZOOM_MAX, readerState.inspectScale + delta));
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if (next === readerState.inspectScale) return;
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if (next === 1) { readerState.inspectScale = 1; readerState.inspectPanX = 0; readerState.inspectPanY = 0; return; }
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const img = getInspectImageEl();
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const anchor = img ?? containerEl;
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const rect = anchor?.getBoundingClientRect();
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const cx = rect ? e.clientX - rect.left - rect.width / 2 : 0;
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const cy = rect ? e.clientY - rect.top - rect.height / 2 : 0;
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const ratio = next / readerState.inspectScale;
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const rawPanX = cx + (readerState.inspectPanX - cx) * ratio;
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const rawPanY = cy + (readerState.inspectPanY - cy) * ratio;
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const [clampedX, clampedY] = clampInspectPan(next, rawPanX, rawPanY);
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readerState.inspectScale = next;
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readerState.inspectPanX = clampedX;
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readerState.inspectPanY = clampedY;
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}
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function handleTap(e: MouseEvent) {
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if (style === "longstrip") return;
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if (inspectDragMoved) { inspectDragMoved = false; return; }
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if (stripDragMoved) { stripDragMoved = false; return; }
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onTap(e);
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}
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function setContainer(el: HTMLDivElement) {
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containerEl = el;
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bindContainer(el);
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if (style === "longstrip") setupObserver(el);
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}
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$effect(() => {
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if (style === "longstrip" && containerEl) {
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setupObserver(containerEl);
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} else if (style !== "longstrip") {
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observer?.disconnect();
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observer = null;
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}
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});
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</script>
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<div
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use:setContainer
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class="viewer"
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class:strip={style === "longstrip"}
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class:inspect-active={readerState.inspectScale > 1}
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style={effectiveWidth != null ? `--effective-width:${effectiveWidth}px` : ""}
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role="presentation"
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tabindex="-1"
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onclick={handleTap}
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ondblclick={(e) => { if (tapToToggleBar) { const x = e.clientX / window.innerWidth; if (x >= 0.3 && x <= 0.7) onToggleUi(); } }}
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onmousedown={onInspectMouseDown}
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onpointerdown={pinchZoomEnabled ? onPointerDown : undefined}
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onwheel={(e) => { if (e.ctrlKey || style !== "longstrip") e.preventDefault(); }}
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style:cursor={style === "longstrip" ? (stripDragging ? "grabbing" : "grab") : undefined}
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onkeydown={(e) => { if (e.key === " " && style === "longstrip") { e.preventDefault(); containerEl?.scrollBy({ top: containerEl.clientHeight * 0.85, behavior: "smooth" }); } }}
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>
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{#if loading}
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<div class="center-overlay"><CircleNotch size={20} weight="light" class="anim-spin" style="color:var(--text-faint)" /></div>
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{/if}
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{#if error}
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<div class="center-overlay"><p class="error-msg">{error}</p></div>
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{/if}
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{#key chapterEpoch}
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{#if style === "longstrip"}
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{#each flatPages as page, gi}
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{@const src = resolvedSrc[gi]}
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{@const isLoaded = loadedSet.has(gi)}
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<div
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class="strip-slot"
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use:observePage={gi}
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data-gi={gi}
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>
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{#if isLoaded}
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<img
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src={src ?? ""}
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alt="{page.chapterName} – Page {page.localIndex + 1}"
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data-local-page={page.localIndex + 1}
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data-chapter={page.chapterId}
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data-total={page.total}
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class="{imgCls}{store.settings.pageGap ? ' strip-gap' : ''}"
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loading="eager"
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decoding="async"
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draggable="false"
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onload={(e) => {
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const img = e.currentTarget as HTMLImageElement;
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const slot = img.closest<HTMLElement>(".strip-slot");
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if (slot && img.naturalWidth > 0) {
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slot.style.setProperty("--aspect", String(img.naturalWidth / img.naturalHeight));
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}
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}}
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/>
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{:else}
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<div class="strip-placeholder"></div>
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{/if}
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</div>
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{/each}
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<div style="height:1px;flex-shrink:0"></div>
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{:else if style === "fade" && pageReady}
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<div class="inspect-wrap" style="transform:scale({readerState.inspectScale}) translate({readerState.inspectPanX / readerState.inspectScale}px,{readerState.inspectPanY / readerState.inspectScale}px)">
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{#await resolveUrl(store.pageUrls[store.pageNumber - 1], 999)}
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<img src="" alt="Page {store.pageNumber}" class={imgCls} decoding="async" style="opacity:0" draggable="false" />
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{:then src}
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<img {src} alt="Page {store.pageNumber}" class={imgCls} decoding="async" style="opacity: {fadingOut ? 0 : 1}; transition: opacity 0.1s ease;" draggable="false" />
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{/await}
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</div>
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{:else if style === "double" && pageReady}
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<div class="inspect-wrap" style="transform:scale({readerState.inspectScale}) translate({readerState.inspectPanX / readerState.inspectScale}px,{readerState.inspectPanY / readerState.inspectScale}px)">
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{#if pageGroups.length}
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<div class="double-wrap">
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{#each currentGroup as pg, i}
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{#await resolveUrl(store.pageUrls[pg - 1], 999)}
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<img src="" alt="Page {pg}" class="{imgCls} page-half {i === 0 ? 'gap-left' : 'gap-right'}" decoding="async" draggable="false" />
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{:then src}
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<img {src} alt="Page {pg}" class="{imgCls} page-half {i === 0 ? 'gap-left' : 'gap-right'}" decoding="async" draggable="false" />
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{/await}
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{/each}
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</div>
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{:else}
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<div class="center-overlay"><CircleNotch size={20} weight="light" class="anim-spin" style="color:var(--text-faint)" /></div>
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{/if}
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</div>
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{:else if pageReady}
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<div class="inspect-wrap" style="transform:scale({readerState.inspectScale}) translate({readerState.inspectPanX / readerState.inspectScale}px,{readerState.inspectPanY / readerState.inspectScale}px)">
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{#await resolveUrl(store.pageUrls[store.pageNumber - 1], 999)}
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<img src="" alt="Page {store.pageNumber}" class={imgCls} decoding="async" draggable="false" />
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{:then src}
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<img {src} alt="Page {store.pageNumber}" class={imgCls} decoding="async" draggable="false" />
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{/await}
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</div>
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{/if}
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{/key}
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</div>
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<style>
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.viewer { flex: 1; overflow-y: auto; overflow-x: hidden; display: flex; flex-direction: column; align-items: center; justify-content: center; -webkit-overflow-scrolling: touch; position: relative; touch-action: pan-x pan-y; }
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.viewer.strip { justify-content: flex-start; padding: var(--sp-4) 0; }
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.viewer:focus { outline: none; }
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.viewer.inspect-active { cursor: grab; overflow: hidden; }
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.viewer.inspect-active:active { cursor: grabbing; }
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:global(.pinch-active) .viewer { touch-action: none; }
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.inspect-wrap { display: flex; align-items: center; justify-content: center; transform-origin: center center; will-change: transform; }
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.strip-slot {
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width: 100%;
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display: flex;
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flex-direction: column;
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align-items: center;
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}
|
||
|
||
.strip-placeholder {
|
||
width: var(--effective-width, 100%);
|
||
max-width: var(--effective-width, 100%);
|
||
aspect-ratio: var(--aspect, 0.667);
|
||
background: transparent;
|
||
}
|
||
|
||
.img { display: block; user-select: none; image-rendering: auto; }
|
||
.img:global(.optimize-contrast) { image-rendering: -webkit-optimize-contrast; }
|
||
:global(.fit-width) { max-width: var(--effective-width, 100%); width: 100%; height: auto; }
|
||
:global(.fit-height) { max-height: calc(100vh - 80px); width: auto; max-width: var(--effective-width, 100%); height: auto; }
|
||
:global(.fit-screen) { max-width: var(--effective-width, 100%); max-height: calc(100vh - 80px); object-fit: contain; height: auto; }
|
||
:global(.fit-original) { max-width: 100%; width: auto; height: auto; }
|
||
:global(.strip-gap) { margin-bottom: 8px; }
|
||
|
||
.double-wrap { display: flex; align-items: flex-start; justify-content: center; max-width: calc(var(--effective-width, 100%) * 2); width: 100%; }
|
||
.page-half { flex: 1; min-width: 0; object-fit: contain; }
|
||
.gap-left { margin-right: 2px; }
|
||
.gap-right { margin-left: 2px; }
|
||
|
||
.center-overlay { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; }
|
||
.error-msg { color: var(--color-error); font-size: var(--text-base); }
|
||
</style> |