File size: 14,706 Bytes
2c1d035 a8c921b cfb1971 a8c921b cfb1971 21669e9 a8c921b 122c37b a8c921b 122c37b a8c921b 2c1d035 a8c921b 2c1d035 9ebca63 2c1d035 9ebca63 2c1d035 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 | export function createReaderToc(readerContext) {
function updateNavigationState(patch) {
return readerContext.readerRuntime.update("navigation", patch);
}
function headingTocEntries(root) {
return [...root.querySelectorAll("h1,h2,h3,h4,h5,h6")]
.filter((heading) => heading.textContent.trim())
.map((target) => ({
label: target.textContent.trim(),
depth: Number(target.tagName.slice(1)) - 1,
target,
activate: () => target.scrollIntoView({ block: "start" })
}));
}
function createHeadingLocationCache(root, entries) {
let positions = null, targets = [], width = -1, extent = -1, zoom = -1, wasAnimating = false, live = false;
const invalidate = () => { positions = null; };
const mutations = new MutationObserver(invalidate), resize = new ResizeObserver(invalidate);
mutations.observe(root, {subtree:true, childList:true, characterData:true,
attributes:true, attributeFilter:["style", "class", "hidden", "width", "height"]});
resize.observe(root);
root.addEventListener("load", invalidate, true);
root.ownerDocument.fonts?.addEventListener("loadingdone", invalidate);
return { root, entries,
at(marker, scroll) {
if (mutations.takeRecords().length) invalidate();
const nextWidth = root.clientWidth, nextExtent = root.scrollHeight, nextZoom = readerContext.documentState.zoom;
const animating = root.getAnimations?.({subtree:true}).some(animation => animation.playState === "running" || animation.pending) || false;
if (live || animating || wasAnimating || nextWidth !== width || nextExtent !== extent || nextZoom !== zoom ||
targets.some(row => row.target !== row.entry.target || row.connected !== !!row.target?.isConnected)) invalidate();
wasAnimating = animating;
if (!positions) {
targets = entries.map((entry, index) => ({entry, index, target:entry.target, connected:!!entry.target?.isConnected}));
const fixed = new WeakMap();
const scrollDependent = target => {
const ancestors = [];
let value = false;
for (let node = target; node; node = node.parentElement) {
if (fixed.has(node)) { value = fixed.get(node); break; }
ancestors.push(node);
const position = root.ownerDocument.defaultView?.getComputedStyle(node).position;
if (position === "fixed" || position === "sticky") { value = true; break; }
if (node === root) break;
}
for (const node of ancestors) fixed.set(node, value);
return value;
};
// Source CSS may pin headings while scrolling; keep their live geometry.
live = targets.some(row => row.connected && scrollDependent(row.target));
positions = targets.filter(row => row.connected).map(row => ({index:row.index,
top:row.target.getBoundingClientRect().top + scroll - marker})).sort((a,b) => a.top-b.top || a.index-b.index);
width = root.clientWidth; extent = root.scrollHeight; zoom = nextZoom;
}
let low = 0, high = positions.length;
while (low < high) {
const middle = (low + high) >> 1;
if (positions[middle].top <= scroll) low = middle + 1;
else high = middle;
}
return positions[low ? low - 1 : 0]?.index ?? -1;
},
dispose() {
mutations.disconnect(); resize.disconnect();
root.removeEventListener("load", invalidate, true);
root.ownerDocument.fonts?.removeEventListener("loadingdone", invalidate);
positions = null; targets = [];
}
};
}
function syncHeadingLocation() {
const marker = readerContext.htmlFrame ? 8 : readerContext.viewport.getBoundingClientRect().top + 8;
const root = readerContext.htmlFrame?.contentDocument?.body || readerContext.content;
if (!["foliate", "epub-chapters"].includes(readerContext.capability.mode)) {
if (readerContext.headingLocationCache?.root !== root || readerContext.headingLocationCache?.entries !== readerContext.navigationState.tocEntries) {
readerContext.headingLocationCache?.dispose();
readerContext.headingLocationCache = readerContext.createHeadingLocationCache(root, readerContext.navigationState.tocEntries);
}
const current = readerContext.headingLocationCache.at(marker, readerContext.htmlFrame ? readerContext.htmlFrame.contentWindow.scrollY : readerContext.viewport.scrollTop);
if (current >= 0 && current !== readerContext.navigationState.currentChapterIndex) {
readerContext.updateNavigationState({currentChapterIndex:current});
readerContext.updateTocCurrentMark();
}
return;
}
let current = -1,
currentPosition = -Infinity,
first = -1,
firstPosition = Infinity;
for (const [index, entry] of readerContext.navigationState.tocEntries.entries()) {
if (!entry.target?.isConnected) continue;
const position = entry.target.getBoundingClientRect().top;
if (position <= marker && (position > currentPosition || (position === currentPosition && index > current))) {
current = index;
currentPosition = position;
}
if (position > marker && position < firstPosition) {
first = index;
firstPosition = position;
}
}
if (current < 0) current = first;
if (current >= 0 && current !== readerContext.navigationState.currentChapterIndex) {
readerContext.updateNavigationState({ currentChapterIndex: current });
readerContext.updateTocCurrentMark();
}
}
async function navigateTocEntry(index) {
if (index < 0 || index >= readerContext.navigationState.tocEntries.length) return;
if (readerContext.navigationState.tocEntries[index].group) return;
const generation = readerContext.beginReaderNavigation(),
entry = readerContext.navigationState.tocEntries[index];
try {
const activated = readerContext.foliateContinuous
? await readerContext.activateFoliateTocEntry(entry, generation)
: await entry.activate(generation);
if (activated === false || !readerContext.isReaderGenerationCurrent("navigation", generation)) return;
readerContext.updateNavigationState({ currentChapterIndex: index });
readerContext.updateTocCurrentMark();
readerContext.updateProgressTools();
readerContext.setReaderPanelOpen(false, true);
} catch (error) {
readerContext.reportNavigationError(error, generation);
}
}
function createTocRow(entry, index) {
const row = document.createElement("div");
row.className = "panel-item toc-item";
row.dataset.tocIndex = String(index);
row.style.setProperty("--toc-depth", String(entry.depth || 0));
const link = document.createElement("div");
link.className = "panel-item-main";
link.textContent = entry.label;
link.title = entry.label;
if (entry.group) {
row.classList.add("toc-group");
link.setAttribute("role", "heading");
link.setAttribute("aria-level", String(Math.min(6, (entry.depth || 0) + 1)));
row.appendChild(link);
return row;
}
link.tabIndex = 0;
link.setAttribute("role", "link");
const activate = (event) => {
const selection = getSelection();
if (event?.type === "click" && selection?.toString() && selection.containsNode(link, true)) return;
readerContext.navigateTocEntry(index);
};
link.addEventListener("click", activate);
link.addEventListener("keydown", (event) => {
if (event.key === "Enter" || event.key === " ") {
event.preventDefault();
activate();
}
});
row.appendChild(link);
return row;
}
function renderVirtualToc() {
const state = readerContext.tocVirtualState;
if (!state) return;
const height = Math.max(320, state.panelView.clientHeight),
start = Math.max(0, Math.floor(state.panelView.scrollTop / readerContext.TOC_VIRTUAL_ROW_HEIGHT) - 12),
end = Math.min(state.entries.length, start + Math.ceil(height / readerContext.TOC_VIRTUAL_ROW_HEIGHT) + 24),
fragment = document.createDocumentFragment();
state.list.replaceChildren();
for (let index = start; index < end; index++) {
const row = readerContext.createTocRow(state.entries[index], index);
row.classList.add("toc-virtual-row");
row.style.top = `${index * readerContext.TOC_VIRTUAL_ROW_HEIGHT}px`;
fragment.appendChild(row);
}
state.list.appendChild(fragment);
readerContext.updateTocCurrentMark();
}
let tocHintShown = false, tocHintPending = false, tocHintTimer = 0;
const cancelTocHint = () => {
clearTimeout(tocHintTimer);
tocHintTimer = 0;
tocHintPending = false;
};
const finishTocHint = () => {
tocHintTimer = 0;
if (readerContext.readerLifecycle.disposed || readerContext.readerAbortController.signal.aborted || !tocHintPending) return;
tocHintPending = false;
if (!readerContext.navigationState.tocEntries.length ||
readerContext.panelState.open || readerContext.readerPanelInteractionSerial > 0 ||
readerContext.readerUiHistoryState !== "base") {
tocHintShown = true;
return;
}
tocHintShown = true;
// Keep the directory open using the normal panel owner: toolbar, Escape,
// system Back and aria-expanded must all agree with the visible drawer.
readerContext.setReaderPanelOpen(true);
readerContext.selectPanel("toc");
};
let phaseCleanup = null;
function ensureTocHintPhaseListener() {
if (phaseCleanup) return;
phaseCleanup = readerContext.readerRuntime.events.on("phase", ({ phase }) => {
if (phase === "failed" || phase === "disposed") {
cancelTocHint();
phaseCleanup?.();
phaseCleanup = null;
}
});
readerContext.readerRuntime.track(() => { cancelTocHint(); phaseCleanup?.(); phaseCleanup = null; });
}
function hintReaderToc() {
if (tocHintShown || tocHintPending || !readerContext.navigationState.tocEntries.length) return;
ensureTocHintPhaseListener();
tocHintPending = true;
// Do not wait for the overall Reader phase: TOC availability itself is the
// useful signal, and the hint should be visible near the opening moment.
tocHintTimer = setTimeout(finishTocHint, 0);
}
function setToc(entries) {
const normalizedEntries = (entries || []).map((entry) => ({
...entry,
href: String(entry.href || ""),
label: readerContext.cleanTocLabel(entry.label)
}));
readerContext.updateNavigationState({
tocEntries: normalizedEntries,
currentChapterIndex: normalizedEntries.findIndex((entry) => !entry.group)
});
const tocTab = document.querySelector("#toc-tab");
tocTab.hidden = false;
tocTab.textContent = normalizedEntries.length ? "目录" : "阅读";
const previousList = document.querySelector("#toc-list"),
list = previousList.cloneNode(false);
readerContext.tocVirtualState?.destroy();
readerContext.tocVirtualState = null;
previousList.replaceWith(list);
const virtualizationThreshold = readerContext.chapterManifestUrl ? 2000 : readerContext.TOC_VIRTUALIZATION_THRESHOLD;
if (normalizedEntries.length > virtualizationThreshold) {
const panelView = list.parentElement;
list.classList.add("toc-list-virtualized");
list.style.height = `${normalizedEntries.length * readerContext.TOC_VIRTUAL_ROW_HEIGHT}px`;
let frame = 0;
const onScroll = () => {
if (frame) return;
frame = requestAnimationFrame(() => {
frame = 0;
readerContext.renderVirtualToc();
});
};
panelView.addEventListener("scroll", onScroll, { passive: true });
readerContext.tocVirtualState = {
entries: normalizedEntries,
list,
panelView,
render: readerContext.renderVirtualToc,
destroy: () => {
panelView.removeEventListener("scroll", onScroll);
if (frame) cancelAnimationFrame(frame);
}
};
readerContext.renderVirtualToc();
} else {
for (const [index, entry] of normalizedEntries.entries())
list.appendChild(readerContext.createTocRow(entry, index));
}
readerContext.updateTocCurrentMark();
hintReaderToc();
}
function cleanTocLabel(value) {
return (
String(value || "未命名章节")
.replace(/[\uFFFD\u2610-\u2612\u25a1\u0000-\u001F\u007F]/gu, "")
.replace(/\s{2,}/gu, " ")
.trim() || "未命名章节"
);
}
function updateTocCurrentMark() {
const rows = [...document.querySelectorAll("#toc-list .toc-item")];
if (readerContext.documentState.pageCount > 1 && readerContext.documentState.page > 0) {
let pageIndex = -1;
for (const [index, entry] of readerContext.navigationState.tocEntries.entries()) {
const match = entry.label.match(/第\s*(\d+)\s*页/u);
if (match && Number(match[1]) <= readerContext.documentState.page) pageIndex = index;
}
if (pageIndex >= 0) readerContext.updateNavigationState({ currentChapterIndex: pageIndex });
}
for (const row of rows) {
const index = Number(row.dataset.tocIndex);
let mark = row.querySelector(".toc-current-mark");
if (!mark) {
mark = document.createElement("span");
mark.className = "toc-current-mark";
mark.setAttribute("aria-hidden", "true");
mark.textContent = "✓";
row.appendChild(mark);
}
mark.hidden = index !== readerContext.navigationState.currentChapterIndex;
row.classList.toggle("is-current", index === readerContext.navigationState.currentChapterIndex);
const link = row.querySelector('[role="link"]');
if (index === readerContext.navigationState.currentChapterIndex) link?.setAttribute("aria-current", "location");
else link?.removeAttribute("aria-current");
}
}
function syncTocTab() {
const tab = document.querySelector("#toc-tab");
if (!tab) return;
tab.hidden = !readerContext.navigationState.tocEntries.length;
if (readerContext.navigationState.tocEntries.length && readerContext.navigationState.currentChapterIndex < 0)
readerContext.updateNavigationState({ currentChapterIndex: readerContext.navigationState.tocEntries.findIndex((entry) => !entry.group) });
}
return {
updateNavigationState,
headingTocEntries,
createHeadingLocationCache,
syncHeadingLocation,
navigateTocEntry,
createTocRow,
renderVirtualToc,
setToc,
cleanTocLabel,
updateTocCurrentMark,
syncTocTab
};
}
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