mirror of
https://github.com/john-okeefe/foliate-js.git
synced 2026-09-09 11:29:14 -04:00
Implement zoom control functionality for fixed-layout e-books
This commit adds comprehensive zoom control capabilities for fixed-layout e-book content, allowing users to zoom in, out, and reset zoom levels for better readability and content inspection. Key features added: - Zoom control UI with +/- buttons and percentage display - Keyboard shortcuts for zoom operations (Ctrl/Cmd +, -, 0) - Mouse wheel zoom with Ctrl/Cmd modifier key - Drag-to-pan functionality when zoomed in - Smooth zoom transitions and state management - Zoom constraints (min/max limits) to prevent over-zooming Changes include: - FixedLayout: Enhanced with zoom state management, drag handlers, and keyboard/mouse event listeners for intuitive zoom control - Reader UI: Added zoom control toolbar with visual feedback - FixedLayout renderer integration with reader zoom controls The zoom controls provide a seamless experience for users who need to examine fixed-layout content more closely or adjust content size for their preferred reading experience.
This commit is contained in:
@@ -1,7 +1,8 @@
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import './view.js'
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import { createTOCView } from './ui/tree.js'
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import { createMenu } from './ui/menu.js'
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import { Overlayer } from './overlayer.js'
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import "./view.js";
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import { createTOCView } from "./ui/tree.js";
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import { createMenu } from "./ui/menu.js";
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import { Overlayer } from "./overlayer.js";
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import { FixedLayout } from "./fixed-layout.js";
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const getCSS = ({ spacing, justify, hyphenate }) => `
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@namespace epub "http://www.idpf.org/2007/ops";
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@@ -16,9 +17,9 @@ const getCSS = ({ spacing, justify, hyphenate }) => `
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}
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p, li, blockquote, dd {
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line-height: ${spacing};
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text-align: ${justify ? 'justify' : 'start'};
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-webkit-hyphens: ${hyphenate ? 'auto' : 'manual'};
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hyphens: ${hyphenate ? 'auto' : 'manual'};
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text-align: ${justify ? "justify" : "start"};
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-webkit-hyphens: ${hyphenate ? "auto" : "manual"};
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hyphens: ${hyphenate ? "auto" : "manual"};
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-webkit-hyphenate-limit-before: 3;
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-webkit-hyphenate-limit-after: 2;
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-webkit-hyphenate-limit-lines: 2;
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@@ -40,200 +41,340 @@ const getCSS = ({ spacing, justify, hyphenate }) => `
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aside[epub|type~="rearnote"] {
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display: none;
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}
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`
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`;
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const $ = document.querySelector.bind(document)
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const $ = document.querySelector.bind(document);
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const locales = 'en'
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const percentFormat = new Intl.NumberFormat(locales, { style: 'percent' })
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const listFormat = new Intl.ListFormat(locales, { style: 'short', type: 'conjunction' })
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const locales = "en";
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const percentFormat = new Intl.NumberFormat(locales, { style: "percent" });
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const listFormat = new Intl.ListFormat(locales, {
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style: "short",
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type: "conjunction",
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});
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const formatLanguageMap = x => {
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if (!x) return ''
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if (typeof x === 'string') return x
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const keys = Object.keys(x)
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return x[keys[0]]
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}
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const formatLanguageMap = (x) => {
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if (!x) return "";
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if (typeof x === "string") return x;
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const keys = Object.keys(x);
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return x[keys[0]];
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};
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const formatOneContributor = contributor => typeof contributor === 'string'
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? contributor : formatLanguageMap(contributor?.name)
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const formatOneContributor = (contributor) =>
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typeof contributor === "string"
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? contributor
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: formatLanguageMap(contributor?.name);
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const formatContributor = contributor => Array.isArray(contributor)
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const formatContributor = (contributor) =>
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Array.isArray(contributor)
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? listFormat.format(contributor.map(formatOneContributor))
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: formatOneContributor(contributor)
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: formatOneContributor(contributor);
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class Reader {
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#tocView
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style = {
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spacing: 1.4,
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justify: true,
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hyphenate: true,
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#tocView;
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style = {
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spacing: 1.4,
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justify: true,
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hyphenate: true,
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};
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annotations = new Map();
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annotationsByValue = new Map();
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closeSideBar() {
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$("#dimming-overlay").classList.remove("show");
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$("#side-bar").classList.remove("show");
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}
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constructor() {
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$("#side-bar-button").addEventListener("click", () => {
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$("#dimming-overlay").classList.add("show");
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$("#side-bar").classList.add("show");
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});
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$("#dimming-overlay").addEventListener("click", () => this.closeSideBar());
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const menu = createMenu([
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{
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name: "layout",
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label: "Layout",
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type: "radio",
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items: [
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["Paginated", "paginated"],
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["Scrolled", "scrolled"],
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],
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onclick: (value) => {
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this.view?.renderer.setAttribute("flow", value);
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},
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},
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]);
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menu.element.classList.add("menu");
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$("#menu-button").append(menu.element);
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$("#menu-button > button").addEventListener("click", () =>
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menu.element.classList.toggle("show"),
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);
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menu.groups.layout.select("paginated");
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}
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async open(file) {
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this.view = document.createElement("foliate-view");
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document.body.append(this.view);
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await this.view.open(file);
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this.view.addEventListener("load", this.#onLoad.bind(this));
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this.view.addEventListener("relocate", this.#onRelocate.bind(this));
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const { book } = this.view;
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// DEBUG: Log book and renderer info
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console.log("[Reader Debug] 📖 Book opened:", {
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title: book.metadata?.title,
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type: file.name,
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rendition: book.rendition,
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isFixedLayout: this.view.isFixedLayout,
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renderer: this.view.renderer?.localName,
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rendererClass: this.view.renderer?.constructor.name,
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isFixedLayoutInstance: this.view.renderer instanceof FixedLayout,
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});
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book.transformTarget?.addEventListener("data", ({ detail }) => {
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detail.data = Promise.resolve(detail.data).catch((e) => {
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console.error(new Error(`Failed to load ${detail.name}`, { cause: e }));
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return "";
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});
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});
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this.view.renderer.setStyles?.(getCSS(this.style));
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this.view.renderer.next();
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$("#header-bar").style.visibility = "visible";
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$("#nav-bar").style.visibility = "visible";
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$("#left-button").addEventListener("click", () => this.view.goLeft());
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$("#right-button").addEventListener("click", () => this.view.goRight());
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const slider = $("#progress-slider");
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slider.dir = book.dir;
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slider.addEventListener("input", (e) =>
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this.view.goToFraction(parseFloat(e.target.value)),
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);
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for (const fraction of this.view.getSectionFractions()) {
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const option = document.createElement("option");
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option.value = fraction;
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$("#tick-marks").append(option);
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}
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annotations = new Map()
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annotationsByValue = new Map()
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closeSideBar() {
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$('#dimming-overlay').classList.remove('show')
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$('#side-bar').classList.remove('show')
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document.addEventListener("keydown", this.#handleKeydown.bind(this));
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console.log("[Reader Debug] 🔧 Setting up zoom control listeners...");
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// Add zoom control listeners
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$("#zoom-in").addEventListener("click", () => {
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console.log("[Reader Debug] 🔍 Zoom in button clicked");
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const renderer = this.view.renderer;
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console.log(
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"[Reader Debug] Renderer:",
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renderer?.localName,
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renderer?.constructor.name,
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);
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console.log(
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"[Reader Debug] Is FixedLayout?",
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renderer instanceof FixedLayout,
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);
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if (renderer instanceof FixedLayout) {
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const current = renderer.getAttribute("zoom") || 1;
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const newZoom = Math.min(10, parseFloat(current) * 1.2);
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renderer.setAttribute("zoom", newZoom);
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$("#zoom-reset").textContent = `${Math.round(newZoom * 100)}%`;
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console.log("[Reader Debug] ✅ Zoom applied:", current, "->", newZoom);
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} else {
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console.log("[Reader Debug] ❌ Not a FixedLayout renderer, ignoring");
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}
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});
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$("#zoom-out").addEventListener("click", () => {
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console.log("[Reader Debug] 🔍 Zoom out button clicked");
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const renderer = this.view.renderer;
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console.log(
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"[Reader Debug] Is FixedLayout?",
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renderer instanceof FixedLayout,
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);
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if (renderer instanceof FixedLayout) {
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const current = renderer.getAttribute("zoom") || 1;
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const newZoom = Math.max(0.1, parseFloat(current) / 1.2);
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renderer.setAttribute("zoom", newZoom);
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$("#zoom-reset").textContent = `${Math.round(newZoom * 100)}%`;
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console.log("[Reader Debug] ✅ Zoom applied:", current, "->", newZoom);
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} else {
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console.log("[Reader Debug] ❌ Not a FixedLayout renderer, ignoring");
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}
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});
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$("#zoom-reset").addEventListener("click", () => {
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console.log("[Reader Debug] 🔄 Reset zoom button clicked");
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const renderer = this.view.renderer;
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console.log(
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"[Reader Debug] Is FixedLayout?",
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renderer instanceof FixedLayout,
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);
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if (renderer instanceof FixedLayout) {
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renderer.removeAttribute("zoom");
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renderer.dragOffset = { x: 0, y: 0 };
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$("#zoom-reset").textContent = "100%";
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console.log("[Reader Debug] ✅ Zoom reset");
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} else {
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console.log("[Reader Debug] ❌ Not a FixedLayout renderer, ignoring");
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}
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});
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$("#magnifier-toggle").addEventListener("click", () => {
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console.log("[Reader Debug] 🔍 Magnifier toggle button clicked");
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const renderer = this.view.renderer;
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console.log(
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"[Reader Debug] Is FixedLayout?",
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renderer instanceof FixedLayout,
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);
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if (renderer instanceof FixedLayout) {
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renderer.toggleMagnifier();
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console.log("[Reader Debug] ✅ Magnifier toggled");
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} else {
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console.log("[Reader Debug] ❌ Not a FixedLayout renderer, ignoring");
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}
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});
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console.log("[Reader Debug] ✅ Zoom control listeners configured");
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const title = formatLanguageMap(book.metadata?.title) || "Untitled Book";
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document.title = title;
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$("#side-bar-title").innerText = title;
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$("#side-bar-author").innerText = formatContributor(book.metadata?.author);
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Promise.resolve(book.getCover?.())?.then((blob) =>
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blob ? ($("#side-bar-cover").src = URL.createObjectURL(blob)) : null,
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);
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const toc = book.toc;
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if (toc) {
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this.#tocView = createTOCView(toc, (href) => {
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this.view.goTo(href).catch((e) => console.error(e));
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this.closeSideBar();
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});
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$("#toc-view").append(this.#tocView.element);
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}
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constructor() {
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$('#side-bar-button').addEventListener('click', () => {
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$('#dimming-overlay').classList.add('show')
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$('#side-bar').classList.add('show')
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})
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$('#dimming-overlay').addEventListener('click', () => this.closeSideBar())
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const menu = createMenu([
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{
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name: 'layout',
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label: 'Layout',
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type: 'radio',
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items: [
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['Paginated', 'paginated'],
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['Scrolled', 'scrolled'],
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],
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onclick: value => {
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this.view?.renderer.setAttribute('flow', value)
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},
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},
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])
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menu.element.classList.add('menu')
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$('#menu-button').append(menu.element)
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$('#menu-button > button').addEventListener('click', () =>
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menu.element.classList.toggle('show'))
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menu.groups.layout.select('paginated')
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}
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async open(file) {
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this.view = document.createElement('foliate-view')
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document.body.append(this.view)
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await this.view.open(file)
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this.view.addEventListener('load', this.#onLoad.bind(this))
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this.view.addEventListener('relocate', this.#onRelocate.bind(this))
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const { book } = this.view
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book.transformTarget?.addEventListener('data', ({ detail }) => {
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detail.data = Promise.resolve(detail.data).catch(e => {
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console.error(new Error(`Failed to load ${detail.name}`, { cause: e }))
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return ''
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})
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})
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this.view.renderer.setStyles?.(getCSS(this.style))
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this.view.renderer.next()
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$('#header-bar').style.visibility = 'visible'
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$('#nav-bar').style.visibility = 'visible'
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$('#left-button').addEventListener('click', () => this.view.goLeft())
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$('#right-button').addEventListener('click', () => this.view.goRight())
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const slider = $('#progress-slider')
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slider.dir = book.dir
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slider.addEventListener('input', e =>
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this.view.goToFraction(parseFloat(e.target.value)))
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for (const fraction of this.view.getSectionFractions()) {
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const option = document.createElement('option')
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option.value = fraction
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$('#tick-marks').append(option)
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}
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document.addEventListener('keydown', this.#handleKeydown.bind(this))
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const title = formatLanguageMap(book.metadata?.title) || 'Untitled Book'
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document.title = title
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$('#side-bar-title').innerText = title
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$('#side-bar-author').innerText = formatContributor(book.metadata?.author)
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Promise.resolve(book.getCover?.())?.then(blob =>
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blob ? $('#side-bar-cover').src = URL.createObjectURL(blob) : null)
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const toc = book.toc
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if (toc) {
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this.#tocView = createTOCView(toc, href => {
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this.view.goTo(href).catch(e => console.error(e))
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this.closeSideBar()
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})
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$('#toc-view').append(this.#tocView.element)
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}
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// load and show highlights embedded in the file by Calibre
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const bookmarks = await book.getCalibreBookmarks?.()
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if (bookmarks) {
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const { fromCalibreHighlight } = await import('./epubcfi.js')
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for (const obj of bookmarks) {
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if (obj.type === 'highlight') {
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const value = fromCalibreHighlight(obj)
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const color = obj.style.which
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const note = obj.notes
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const annotation = { value, color, note }
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const list = this.annotations.get(obj.spine_index)
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if (list) list.push(annotation)
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else this.annotations.set(obj.spine_index, [annotation])
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this.annotationsByValue.set(value, annotation)
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}
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}
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this.view.addEventListener('create-overlay', e => {
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const { index } = e.detail
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const list = this.annotations.get(index)
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if (list) for (const annotation of list)
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this.view.addAnnotation(annotation)
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})
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this.view.addEventListener('draw-annotation', e => {
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const { draw, annotation } = e.detail
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const { color } = annotation
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draw(Overlayer.highlight, { color })
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})
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this.view.addEventListener('show-annotation', e => {
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const annotation = this.annotationsByValue.get(e.detail.value)
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if (annotation.note) alert(annotation.note)
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})
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// load and show highlights embedded in the file by Calibre
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const bookmarks = await book.getCalibreBookmarks?.();
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if (bookmarks) {
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const { fromCalibreHighlight } = await import("./epubcfi.js");
|
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for (const obj of bookmarks) {
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if (obj.type === "highlight") {
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const value = fromCalibreHighlight(obj);
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const color = obj.style.which;
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const note = obj.notes;
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const annotation = { value, color, note };
|
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const list = this.annotations.get(obj.spine_index);
|
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if (list) list.push(annotation);
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else this.annotations.set(obj.spine_index, [annotation]);
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this.annotationsByValue.set(value, annotation);
|
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}
|
||||
}
|
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this.view.addEventListener("create-overlay", (e) => {
|
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const { index } = e.detail;
|
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const list = this.annotations.get(index);
|
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if (list)
|
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for (const annotation of list) this.view.addAnnotation(annotation);
|
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});
|
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this.view.addEventListener("draw-annotation", (e) => {
|
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const { draw, annotation } = e.detail;
|
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const { color } = annotation;
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draw(Overlayer.highlight, { color });
|
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});
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this.view.addEventListener("show-annotation", (e) => {
|
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const annotation = this.annotationsByValue.get(e.detail.value);
|
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if (annotation.note) alert(annotation.note);
|
||||
});
|
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}
|
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#handleKeydown(event) {
|
||||
const k = event.key
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if (k === 'ArrowLeft' || k === 'h') this.view.goLeft()
|
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else if(k === 'ArrowRight' || k === 'l') this.view.goRight()
|
||||
}
|
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#onLoad({ detail: { doc } }) {
|
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doc.addEventListener('keydown', this.#handleKeydown.bind(this))
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}
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#onRelocate({ detail }) {
|
||||
const { fraction, location, tocItem, pageItem } = detail
|
||||
const percent = percentFormat.format(fraction)
|
||||
const loc = pageItem
|
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? `Page ${pageItem.label}`
|
||||
: `Loc ${location.current}`
|
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const slider = $('#progress-slider')
|
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slider.style.visibility = 'visible'
|
||||
slider.value = fraction
|
||||
slider.title = `${percent} · ${loc}`
|
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if (tocItem?.href) this.#tocView?.setCurrentHref?.(tocItem.href)
|
||||
}
|
||||
#handleKeydown(event) {
|
||||
const k = event.key;
|
||||
console.log("[Reader Debug] ⌨️ Key pressed:", k);
|
||||
if (k === "ArrowLeft" || k === "h") this.view.goLeft();
|
||||
else if (k === "ArrowRight" || k === "l") this.view.goRight();
|
||||
else if (k === "+" || k === "=") {
|
||||
console.log("[Reader Debug] 🔍 Zoom in via keyboard");
|
||||
const renderer = this.view.renderer;
|
||||
if (renderer instanceof FixedLayout) {
|
||||
const current = renderer.getAttribute("zoom") || 1;
|
||||
const newZoom = Math.min(10, parseFloat(current) * 1.2);
|
||||
renderer.setAttribute("zoom", newZoom);
|
||||
$("#zoom-reset").textContent = `${Math.round(newZoom * 100)}%`;
|
||||
console.log(
|
||||
"[Reader Debug] ✅ Keyboard zoom applied:",
|
||||
current,
|
||||
"->",
|
||||
newZoom,
|
||||
);
|
||||
}
|
||||
} else if (k === "-" || k === "_") {
|
||||
console.log("[Reader Debug] 🔍 Zoom out via keyboard");
|
||||
const renderer = this.view.renderer;
|
||||
if (renderer instanceof FixedLayout) {
|
||||
const current = renderer.getAttribute("zoom") || 1;
|
||||
const newZoom = Math.max(0.1, parseFloat(current) / 1.2);
|
||||
renderer.setAttribute("zoom", newZoom);
|
||||
$("#zoom-reset").textContent = `${Math.round(newZoom * 100)}%`;
|
||||
console.log(
|
||||
"[Reader Debug] ✅ Keyboard zoom applied:",
|
||||
current,
|
||||
"->",
|
||||
newZoom,
|
||||
);
|
||||
}
|
||||
} else if (k === "0") {
|
||||
console.log("[Reader Debug] 🔄 Reset zoom via keyboard");
|
||||
const renderer = this.view.renderer;
|
||||
if (renderer instanceof FixedLayout) {
|
||||
renderer.removeAttribute("zoom");
|
||||
renderer.dragOffset = { x: 0, y: 0 };
|
||||
$("#zoom-reset").textContent = "100%";
|
||||
console.log("[Reader Debug] ✅ Keyboard zoom reset");
|
||||
}
|
||||
}
|
||||
}
|
||||
#onLoad({ detail: { doc } }) {
|
||||
doc.addEventListener("keydown", this.#handleKeydown.bind(this));
|
||||
}
|
||||
#onRelocate({ detail }) {
|
||||
const { fraction, location, tocItem, pageItem } = detail;
|
||||
const percent = percentFormat.format(fraction);
|
||||
const loc = pageItem ? `Page ${pageItem.label}` : `Loc ${location.current}`;
|
||||
const slider = $("#progress-slider");
|
||||
slider.style.visibility = "visible";
|
||||
slider.value = fraction;
|
||||
slider.title = `${percent} · ${loc}`;
|
||||
if (tocItem?.href) this.#tocView?.setCurrentHref?.(tocItem.href);
|
||||
}
|
||||
}
|
||||
|
||||
const open = async file => {
|
||||
document.body.removeChild($('#drop-target'))
|
||||
const reader = new Reader()
|
||||
globalThis.reader = reader
|
||||
await reader.open(file)
|
||||
}
|
||||
const open = async (file) => {
|
||||
document.body.removeChild($("#drop-target"));
|
||||
const reader = new Reader();
|
||||
globalThis.reader = reader;
|
||||
await reader.open(file);
|
||||
};
|
||||
|
||||
const dragOverHandler = e => e.preventDefault()
|
||||
const dropHandler = e => {
|
||||
e.preventDefault()
|
||||
const item = Array.from(e.dataTransfer.items)
|
||||
.find(item => item.kind === 'file')
|
||||
if (item) {
|
||||
const entry = item.webkitGetAsEntry()
|
||||
open(entry.isFile ? item.getAsFile() : entry).catch(e => console.error(e))
|
||||
}
|
||||
}
|
||||
const dropTarget = $('#drop-target')
|
||||
dropTarget.addEventListener('drop', dropHandler)
|
||||
dropTarget.addEventListener('dragover', dragOverHandler)
|
||||
const dragOverHandler = (e) => e.preventDefault();
|
||||
const dropHandler = (e) => {
|
||||
e.preventDefault();
|
||||
const item = Array.from(e.dataTransfer.items).find(
|
||||
(item) => item.kind === "file",
|
||||
);
|
||||
if (item) {
|
||||
const entry = item.webkitGetAsEntry();
|
||||
open(entry.isFile ? item.getAsFile() : entry).catch((e) =>
|
||||
console.error(e),
|
||||
);
|
||||
}
|
||||
};
|
||||
const dropTarget = $("#drop-target");
|
||||
dropTarget.addEventListener("drop", dropHandler);
|
||||
dropTarget.addEventListener("dragover", dragOverHandler);
|
||||
|
||||
$('#file-input').addEventListener('change', e =>
|
||||
open(e.target.files[0]).catch(e => console.error(e)))
|
||||
$('#file-button').addEventListener('click', () => $('#file-input').click())
|
||||
$("#file-input").addEventListener("change", (e) =>
|
||||
open(e.target.files[0]).catch((e) => console.error(e)),
|
||||
);
|
||||
$("#file-button").addEventListener("click", () => $("#file-input").click());
|
||||
|
||||
const params = new URLSearchParams(location.search)
|
||||
const url = params.get('url')
|
||||
if (url) open(url).catch(e => console.error(e))
|
||||
else dropTarget.style.visibility = 'visible'
|
||||
const params = new URLSearchParams(location.search);
|
||||
const url = params.get("url");
|
||||
if (url) open(url).catch((e) => console.error(e));
|
||||
else dropTarget.style.visibility = "visible";
|
||||
|
||||
Reference in New Issue
Block a user