[add] highlight position node on start & on resize (easier to find your place)
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5d9c0804bd
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d8ee1f0747
@ -7,6 +7,7 @@ class EBookReader {
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pages: 0,
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percentage: 0,
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progress: "",
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progressElement: null,
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readActivity: [],
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words: 0,
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};
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@ -15,9 +16,11 @@ class EBookReader {
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// Set Variables
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Object.assign(this.bookState, bookState);
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// Load Settings
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this.loadSettings();
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// Load EPUB
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this.book = ePub(file, { openAs: "epub" });
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window.book = this.book;
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// Render
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this.rendition = this.book.renderTo("viewer", {
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@ -30,9 +33,6 @@ class EBookReader {
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// Setup Reader
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this.book.ready.then(this.setupReader.bind(this));
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// Load Settings
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this.loadSettings();
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// Initialize
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this.initDevice();
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this.initWakeLock();
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@ -46,9 +46,8 @@ class EBookReader {
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**/
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async setupReader() {
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// Load Progress
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let currentCFI = await this.fromProgress(this.bookState.progress);
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if (!currentCFI) this.bookState.currentWord = 0;
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await this.rendition.display(currentCFI);
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let { cfi } = await this.getCFIFromXPath(this.bookState.progress);
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if (!cfi) this.bookState.currentWord = 0;
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let getStats = function () {
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// Start Timer
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@ -64,7 +63,12 @@ class EBookReader {
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// Register Content Hook
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this.rendition.hooks.content.register(getStats);
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getStats();
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await this.rendition.display(cfi);
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// Highlight Element - DOM Has Element
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let { element } = await this.getCFIFromXPath(this.bookState.progress);
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this.bookState.progressElement = element;
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this.highlightPositionMarker();
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}
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initDevice() {
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@ -144,19 +148,19 @@ class EBookReader {
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/**
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* Set theme & meta theme color
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**/
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setTheme(themeName) {
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setTheme(newTheme) {
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// Update Settings
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this.readerSettings.theme = themeName;
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this.readerSettings.theme = newTheme;
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this.saveSettings();
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// Set Reader Theme
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this.rendition.themes.select(themeName);
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this.rendition.themes.select(newTheme);
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// Get Reader Theme
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let themeColorEl = document.querySelector("[name='theme-color']");
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let themeStyleSheet = document.querySelector("#themes").sheet;
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let themeStyleRule = Array.from(themeStyleSheet.cssRules).find(
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(item) => item.selectorText == "." + themeName
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(item) => item.selectorText == "." + newTheme
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);
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// Match Reader Theme
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@ -164,6 +168,41 @@ class EBookReader {
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let backgroundColor = themeStyleRule.style.backgroundColor;
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themeColorEl.setAttribute("content", backgroundColor);
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document.body.style.backgroundColor = backgroundColor;
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// Update Position Highlight Theme
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this.rendition.getContents().forEach((item) => {
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item.document.querySelectorAll(".highlight").forEach((el) => {
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Object.assign(el.style, {
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background: backgroundColor,
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});
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});
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});
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}
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highlightPositionMarker() {
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if (!this.bookState.progressElement) return;
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// Remove Existing
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this.rendition.getContents().forEach((item) => {
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item.document.querySelectorAll(".highlight").forEach((el) => {
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el.removeAttribute("style");
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el.classList.remove("highlight");
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});
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});
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// Compute Style
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let backgroundColor = getComputedStyle(
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this.bookState.progressElement.ownerDocument.body
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).backgroundColor;
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// Set Style
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Object.assign(this.bookState.progressElement.style, {
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background: backgroundColor,
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filter: "invert(0.2)",
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});
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// Update Class
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this.bookState.progressElement.classList.add("highlight");
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}
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/**
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@ -196,12 +235,17 @@ class EBookReader {
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let topBar = document.querySelector("#top-bar");
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let bottomBar = document.querySelector("#bottom-bar");
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// Local Functions
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let getCFIFromXPath = this.getCFIFromXPath.bind(this);
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let highlightPositionMarker = this.highlightPositionMarker.bind(this);
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let nextPage = this.nextPage.bind(this);
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let prevPage = this.prevPage.bind(this);
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let saveSettings = this.saveSettings.bind(this);
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// Font Scaling
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// Local Vars
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let readerSettings = this.readerSettings;
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let bookState = this.bookState;
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this.rendition.hooks.render.register(function (doc, data) {
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let renderDoc = doc.document;
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@ -227,15 +271,10 @@ class EBookReader {
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// ------------------------------------------------ //
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// ---------------- Resize Helpers ---------------- //
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// ------------------------------------------------ //
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let isScaling = false;
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let lastScale = 1;
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let lastLocation = undefined;
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let debounceID = undefined;
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let debounceGesture = () => {
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this.display(lastLocation.start.cfi);
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lastLocation = undefined;
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isScaling = false;
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};
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let isScaling = false;
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let timeoutID = undefined;
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let cfiLocation = undefined;
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// Gesture Listener
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renderDoc.addEventListener(
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@ -244,16 +283,15 @@ class EBookReader {
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e.preventDefault();
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isScaling = true;
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clearTimeout(debounceID);
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clearTimeout(timeoutID);
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if (!cfiLocation)
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({ cfi: cfiLocation } = await getCFIFromXPath(bookState.progress));
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if (!lastLocation) {
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lastLocation = await this.currentLocation();
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} else {
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// Damped Scale
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readerSettings.fontSize =
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(readerSettings.fontSize || 1) + (e.scale - lastScale) / 5;
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lastScale = e.scale;
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saveSettings();
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// Update Font Size
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renderDoc.documentElement.style.setProperty(
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@ -261,8 +299,20 @@ class EBookReader {
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(readerSettings.fontSize || 1) + "em"
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);
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debounceID = setTimeout(debounceGesture, 200);
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}
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timeoutID = setTimeout(() => {
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// Display Position
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this.display(cfiLocation);
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// Reset Variables
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isScaling = false;
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cfiLocation = undefined;
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// Highlight Location
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highlightPositionMarker();
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// Save Settings (Font Size)
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saveSettings();
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}, 250);
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}.bind(this),
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true
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);
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@ -486,7 +536,11 @@ class EBookReader {
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this.updateBookStats(stats);
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// Update & Flush Progress
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this.bookState.progress = await this.toProgress();
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let currentCFI = await this.rendition.currentLocation();
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let { element, xpath } = await this.getXPathFromCFI(currentCFI.start.cfi);
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this.bookState.progress = xpath;
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this.bookState.progressElement = element;
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this.flushProgress();
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}
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@ -512,7 +566,10 @@ class EBookReader {
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this.updateBookStats(stats);
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// Update & Flush Progress
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this.bookState.progress = await this.toProgress();
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let currentCFI = await this.rendition.currentLocation();
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let { element, xpath } = await this.getXPathFromCFI(currentCFI.start.cfi);
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this.bookState.progress = xpath;
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this.bookState.progressElement = element;
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this.flushProgress();
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}
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@ -690,17 +747,21 @@ class EBookReader {
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/**
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* Get XPath from current location
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**/
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async toProgress() {
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async getXPathFromCFI(cfi) {
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// Get DocFragment (current book spline index)
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let currentPos = await this.rendition.currentLocation();
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let docFragmentIndex = currentPos.start.index + 1;
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let startCFI = cfi.replace("epubcfi(", "");
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let docFragmentIndex =
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this.book.spine.spineItems.find((item) =>
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startCFI.startsWith(item.cfiBase)
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).index + 1;
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// Base Progress
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let newPos = "/body/DocFragment[" + docFragmentIndex + "]/body";
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// Get first visible node
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let contents = this.rendition.getContents()[0];
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let node = contents.range(currentPos.start.cfi).startContainer;
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let node = contents.range(cfi).startContainer;
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let element = null;
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// Walk upwards and build progress until body
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let childPos = "";
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@ -709,6 +770,8 @@ class EBookReader {
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switch (node.nodeType) {
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case Node.ELEMENT_NODE:
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// Store First Element Node
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if (!element) element = node;
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let relativeIndex =
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Array.from(node.parentNode.children)
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.filter((item) => item.nodeName == node.nodeName)
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@ -742,44 +805,51 @@ class EBookReader {
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node = node.parentNode;
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}
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let xpath = newPos + childPos;
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// Return derived progress
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return newPos + childPos;
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return { xpath, element };
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}
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/**
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* Get CFI from XPath
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* Get CFI from current location
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**/
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async fromProgress(progress) {
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// Progress Reference - Example: /body/DocFragment[15]/body/div[10]/text().184
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async getCFIFromXPath(xpath) {
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// XPath Reference - Example: /body/DocFragment[15]/body/div[10]/text().184
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//
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// - /body/DocFragment[15] = 15th item in book spline
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// - [...]/body/div[10] = 10th child div under body (direct descendents only)
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// - [...]/text().184 = text node of parent, character offset @ 184 chars?
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// No Progress
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if (!progress || progress == "") return;
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// No XPath
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if (!xpath || xpath == "") return;
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// Match Document Fragment Index
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let fragMatch = progress.match(/^\/body\/DocFragment\[(\d+)\]/);
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let fragMatch = xpath.match(/^\/body\/DocFragment\[(\d+)\]/);
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if (!fragMatch) {
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console.warn("No Progress Match");
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console.warn("No XPath Match");
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return;
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}
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// Match Item Index
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let indexMatch = progress.match(/\.(\d+)$/);
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let indexMatch = xpath.match(/\.(\d+)$/);
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let itemIndex = indexMatch ? parseInt(indexMatch[1]) : 0;
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// Get Spine Item
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let spinePosition = parseInt(fragMatch[1]) - 1;
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let docItem = this.book.spine.get(spinePosition);
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let sectionItem = this.book.spine.get(spinePosition);
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await sectionItem.load(this.book.load.bind(this.book));
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// Required for docItem.document Access
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await docItem.load(this.book.load.bind(this.book));
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// Document Rendered > Document Not Rendered
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let docItem =
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this.rendition
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.getContents()
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.find((item) => item.sectionIndex == spinePosition)?.document ||
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sectionItem.document;
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// Derive XPath & Namespace
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let namespaceURI = docItem.document.documentElement.namespaceURI;
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let remainingXPath = progress
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let namespaceURI = docItem.documentElement.namespaceURI;
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let remainingXPath = xpath
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// Replace with new base
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.replace(fragMatch[0], "/html")
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// Replace `.0` Ending Indexes
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@ -791,9 +861,9 @@ class EBookReader {
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if (namespaceURI) remainingXPath = remainingXPath.replaceAll("/", "/ns:");
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// Perform XPath
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let docSearch = docItem.document.evaluate(
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let docSearch = docItem.evaluate(
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remainingXPath,
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docItem.document,
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docItem,
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function (prefix) {
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if (prefix === "ns") {
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return namespaceURI;
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@ -804,11 +874,14 @@ class EBookReader {
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);
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// Get Element & CFI
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let matchedItem = docSearch.iterateNext();
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let matchedCFI = docItem.cfiFromElement(matchedItem);
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return matchedCFI;
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let element = docSearch.iterateNext();
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let cfi = sectionItem.cfiFromElement(element);
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return { cfi, element };
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}
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// getElementFromXPath(xpath)
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/**
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* Get visible word count - used for reading stats
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**/
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@ -22,7 +22,7 @@
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}
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html {
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height: 100vh;
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height: calc(100% + env(safe-area-inset-bottom));
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padding: env(safe-area-inset-top) env(safe-area-inset-right)
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0 env(safe-area-inset-left);
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}
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@ -2,7 +2,7 @@
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<a href="../">Documents</a>
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{{end}} {{define "content"}}
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<div id="viewer" class="w-full h-screen"></div>
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<div id="viewer" class="w-full h-full"></div>
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<script src="../../assets/reader/platform.js"></script>
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<script src="../../assets/reader/jszip.min.js"></script>
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