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563 lines
17 KiB
JavaScript
563 lines
17 KiB
JavaScript
/*
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* kthoom.js
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*
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* Licensed under the MIT License
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*
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* Copyright(c) 2011 Google Inc.
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* Copyright(c) 2011 antimatter15
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*/
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/* Reference Documentation:
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* Web Workers: http://www.whatwg.org/specs/web-workers/current-work/
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* Web Workers in Mozilla: https://developer.mozilla.org/En/Using_web_workers
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* File API (FileReader): http://www.w3.org/TR/FileAPI/
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* Typed Arrays: http://www.khronos.org/registry/typedarray/specs/latest/#6
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*/
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/* global screenfull */
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if (window.opera) {
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window.console.log = function(str) {
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opera.postError(str);
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};
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}
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var kthoom;
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// gets the element with the given id
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function getElem(id) {
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if (document.documentElement.querySelector) {
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// querySelector lookup
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return document.body.querySelector("#" + id);
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}
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// getElementById lookup
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return document.getElementById(id);
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}
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if (typeof window.kthoom === "undefined" ) {
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kthoom = {};
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}
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// key codes
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kthoom.Key = {
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ESCAPE: 27,
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SPACE: 32,
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LEFT: 37,
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UP: 38,
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RIGHT: 39,
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DOWN: 40,
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A: 65, B: 66, C: 67, D: 68, E: 69, F: 70, G: 71, H: 72, I: 73, J: 74, K: 75, L: 76, M: 77,
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N: 78, O: 79, P: 80, Q: 81, R: 82, S: 83, T: 84, U: 85, V: 86, W: 87, X: 88, Y: 89, Z: 90,
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QUESTION_MARK: 191,
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LEFT_SQUARE_BRACKET: 219,
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RIGHT_SQUARE_BRACKET: 221
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};
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// global variables
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var currentImage = 0;
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var imageFiles = [];
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var imageFilenames = [];
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var totalImages = 0;
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var settings = {
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hflip: false,
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vflip: false,
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rotateTimes: 0,
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fitMode: kthoom.Key.B,
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theme: "light"
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};
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kthoom.saveSettings = function() {
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localStorage.kthoomSettings = JSON.stringify(settings);
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};
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kthoom.loadSettings = function() {
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try {
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if (!localStorage.kthoomSettings) {
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return;
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}
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$.extend(settings, JSON.parse(localStorage.kthoomSettings));
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kthoom.setSettings();
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} catch (err) {
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alert("Error load settings");
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}
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};
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kthoom.setSettings = function() {
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// Set settings control values
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$.each(settings, function(key, value) {
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if (typeof value === "boolean") {
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$("input[name=" + key + "]").prop("checked", value);
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} else {
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$("input[name=" + key + "]").val([value]);
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}
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});
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};
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// Stores an image filename and its data: URI.
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kthoom.ImageFile = function(file) {
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this.filename = file.filename;
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this.dataURI = file.fileData;
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this.data = file;
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};
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function initProgressClick() {
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$("#progress").click(function(e) {
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var page = Math.max(1, Math.ceil((e.offsetX / $(this).width()) * totalImages)) - 1;
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currentImage = page;
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updatePage();
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});
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};
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function loadFromArrayBuffer(ab) {
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var f = [];
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f.fileData = ab.content;
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f.filename = ab.name;
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// add any new pages based on the filename
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if (imageFilenames.indexOf(f.filename) === -1) {
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imageFilenames.push(f.filename);
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imageFiles.push(new kthoom.ImageFile(f));
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// add thumbnails to the TOC list
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$("#thumbnails").append(
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"<li>" +
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"<a data-page='" + imageFiles.length + "'>" +
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"<img src='" + imageFiles[imageFiles.length - 1].dataURI + "'/>" +
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"<span>" + imageFiles.length + "</span>" +
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"</a>" +
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"</li>"
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);
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}
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var percentage = ((ab.page + 1) / (ab.last + 1)) * 100;
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updateProgress(percentage);
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totalImages = ab.last + 1;
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// display first page if we haven't yet
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if (imageFiles.length === currentImage + 1) {
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updatePage();
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}
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}
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function scrollTocToActive() {
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// Scroll to the thumbnail in the TOC on page change
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$('#tocView').stop().animate({
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scrollTop: $('#tocView a.active').position().top
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}, 200);
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}
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function updatePage() {
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$('.page').text((currentImage + 1 ) + "/" + totalImages);
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// Mark the current page in the TOC
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$('#tocView a[data-page]')
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// Remove the currently active thumbnail
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.removeClass('active')
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// Find the new one
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.filter('[data-page='+ (currentImage + 1) +']')
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// Set it to active
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.addClass('active');
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scrollTocToActive();
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updateProgress();
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if (imageFiles[currentImage]) {
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setImage(imageFiles[currentImage].dataURI);
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} else {
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setImage("loading");
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}
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$("body").toggleClass("dark-theme", settings.theme === "dark");
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kthoom.setSettings();
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kthoom.saveSettings();
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}
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function updateProgress(loadPercentage) {
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// Set the load/unzip progress if it's passed in
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if (loadPercentage) {
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$("#progress .bar-load").css({ width: loadPercentage + "%" });
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if (loadPercentage === 100) {
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$("#progress")
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.removeClass('loading')
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.find(".load").text('');
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}
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}
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// Set page progress bar
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$("#progress .bar-read").css({ width: totalImages === 0 ? 0 : Math.round((currentImage + 1) / totalImages * 100) + "%"});
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}
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function setImage(url) {
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var canvas = $("#mainImage")[0];
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var x = $("#mainImage")[0].getContext("2d");
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$("#mainText").hide();
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if (url === "loading") {
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updateScale(true);
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canvas.width = innerWidth - 100;
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canvas.height = 200;
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x.fillStyle = "black";
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x.textAlign = "center";
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x.font = "24px sans-serif";
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x.strokeStyle = "black";
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x.fillText("Loading Page #" + (currentImage + 1), innerWidth / 2, 100);
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} else {
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if (url === "error") {
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updateScale(true);
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canvas.width = innerWidth - 100;
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canvas.height = 200;
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x.fillStyle = "black";
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x.textAlign = "center";
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x.font = "24px sans-serif";
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x.strokeStyle = "black";
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x.fillText("Unable to decompress image #" + (currentImage + 1), innerWidth / 2, 100);
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} else {
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if ($("body").css("scrollHeight") / innerHeight > 1) {
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$("body").css("overflowY", "scroll");
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}
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var img = new Image();
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img.onerror = function() {
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canvas.width = innerWidth - 100;
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canvas.height = 300;
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updateScale(true);
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x.fillStyle = "black";
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x.font = "50px sans-serif";
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x.strokeStyle = "black";
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x.fillText("Page #" + (currentImage + 1) + " (" +
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imageFiles[currentImage].filename + ")", innerWidth / 2, 100);
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x.fillStyle = "black";
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x.fillText("Is corrupt or not an image", innerWidth / 2, 200);
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var xhr = new XMLHttpRequest();
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if (/(html|htm)$/.test(imageFiles[currentImage].filename)) {
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xhr.open("GET", url, true);
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xhr.onload = function() {
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$("#mainText").css("display", "");
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$("#mainText").innerHTML("<iframe style=\"width:100%;height:700px;border:0\" src=\"data:text/html," + escape(xhr.responseText) + "\"></iframe>");
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}
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xhr.send(null);
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} else if (!/(jpg|jpeg|png|gif)$/.test(imageFiles[currentImage].filename) && imageFiles[currentImage].data.uncompressedSize < 10 * 1024) {
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xhr.open("GET", url, true);
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xhr.onload = function() {
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$("#mainText").css("display", "");
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$("#mainText").innerText(xhr.responseText);
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};
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xhr.send(null);
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}
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};
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img.onload = function() {
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var h = img.height,
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w = img.width,
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sw = w,
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sh = h;
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settings.rotateTimes = (4 + settings.rotateTimes) % 4;
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x.save();
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if (settings.rotateTimes % 2 === 1) {
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sh = w;
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sw = h;
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}
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canvas.height = sh;
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canvas.width = sw;
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x.translate(sw / 2, sh / 2);
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x.rotate(Math.PI / 2 * settings.rotateTimes);
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x.translate(-w / 2, -h / 2);
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if (settings.vflip) {
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x.scale(1, -1);
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x.translate(0, -h);
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}
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if (settings.hflip) {
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x.scale(-1, 1);
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x.translate(-w, 0);
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}
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canvas.style.display = "none";
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scrollTo(0, 0);
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x.drawImage(img, 0, 0);
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updateScale(false);
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canvas.style.display = "";
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$("body").css("overflowY", "");
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x.restore();
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};
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img.src = url;
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}
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}
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}
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function showPrevPage() {
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currentImage--;
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if (currentImage < 0) {
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// Freeze on the current page.
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currentImage++;
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} else {
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updatePage();
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}
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}
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function showNextPage() {
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currentImage++;
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if (currentImage >= Math.max(totalImages, imageFiles.length)) {
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// Freeze on the current page.
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currentImage--;
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} else {
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updatePage();
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}
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}
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function updateScale(clear) {
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var mainImageStyle = getElem("mainImage").style;
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mainImageStyle.width = "";
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mainImageStyle.height = "";
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mainImageStyle.maxWidth = "";
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mainImageStyle.maxHeight = "";
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var maxheight = innerHeight - 50;
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if (!clear) {
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switch (settings.fitMode) {
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case kthoom.Key.B:
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mainImageStyle.maxWidth = "100%";
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mainImageStyle.maxHeight = maxheight + "px";
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break;
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case kthoom.Key.H:
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mainImageStyle.height = maxheight + "px";
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break;
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case kthoom.Key.W:
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mainImageStyle.width = "100%";
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break;
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default:
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break;
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}
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}
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$("#mainContent").css({maxHeight: maxheight + 5});
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kthoom.setSettings();
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kthoom.saveSettings();
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}
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function keyHandler(evt) {
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var hasModifier = evt.ctrlKey || evt.shiftKey || evt.metaKey;
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switch (evt.keyCode) {
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case kthoom.Key.LEFT:
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if (hasModifier) break;
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showPrevPage();
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break;
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case kthoom.Key.RIGHT:
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if (hasModifier) break;
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showNextPage();
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break;
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case kthoom.Key.L:
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if (hasModifier) break;
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settings.rotateTimes--;
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if (settings.rotateTimes < 0) {
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settings.rotateTimes = 3;
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}
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updatePage();
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break;
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case kthoom.Key.R:
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if (hasModifier) break;
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settings.rotateTimes++;
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if (settings.rotateTimes > 3) {
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settings.rotateTimes = 0;
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}
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updatePage();
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break;
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case kthoom.Key.F:
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if (hasModifier) break;
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if (!settings.hflip && !settings.vflip) {
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settings.hflip = true;
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} else if (settings.hflip === true && settings.vflip === true) {
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settings.vflip = false;
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settings.hflip = false;
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} else if (settings.hflip === true) {
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settings.vflip = true;
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settings.hflip = false;
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} else if (settings.vflip === true) {
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settings.hflip = true;
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}
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updatePage();
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break;
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case kthoom.Key.W:
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if (hasModifier) break;
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settings.fitMode = kthoom.Key.W;
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updateScale(false);
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break;
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case kthoom.Key.H:
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if (hasModifier) break;
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settings.fitMode = kthoom.Key.H;
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updateScale(false);
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break;
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case kthoom.Key.B:
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if (hasModifier) break;
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settings.fitMode = kthoom.Key.B;
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updateScale(false);
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break;
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case kthoom.Key.N:
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if (hasModifier) break;
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settings.fitMode = kthoom.Key.N;
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updateScale(false);
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break;
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case kthoom.Key.SPACE:
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var container = $('#mainContent');
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var atTop = container.scrollTop() === 0;
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var atBottom = container.scrollTop() >= container[0].scrollHeight - container.height();
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if (evt.shiftKey && atTop) {
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evt.preventDefault();
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// If it's Shift + Space and the container is at the top of the page
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showPrevPage();
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} else if (!evt.shiftKey && atBottom) {
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evt.preventDefault();
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// If you're at the bottom of the page and you only pressed space
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showNextPage();
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container.scrollTop(0);
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}
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break;
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default:
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//console.log('KeyCode', evt.keyCode);
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break;
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}
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}
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function ImageLoadCallback() {
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var jso = this.response;
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// Unable to decompress file, or no response from server
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if (jso === null) {
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setImage("error");
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} else {
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// IE 11 sometimes sees the response as a string
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if (typeof jso !== "object") {
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jso = JSON.parse(jso);
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}
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if (jso.page !== jso.last) {
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this.open("GET", this.fileid + "/" + (jso.page + 1));
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this.addEventListener("load", ImageLoadCallback);
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this.send();
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}
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loadFromArrayBuffer(jso);
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}
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}
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function init(fileid) {
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var request = new XMLHttpRequest();
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request.open("GET", fileid);
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request.responseType = "json";
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request.fileid = fileid.substring(0, fileid.length - 2);
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request.addEventListener("load", ImageLoadCallback);
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request.send();
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initProgressClick();
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document.body.className += /AppleWebKit/.test(navigator.userAgent) ? " webkit" : "";
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kthoom.loadSettings();
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updateScale(true);
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$(document).keydown(keyHandler);
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$(window).resize(function() {
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updateScale(false);
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});
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// Open TOC menu
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$("#slider").click(function() {
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$("#sidebar").toggleClass("open");
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$("#main").toggleClass("closed");
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$(this).toggleClass("icon-menu icon-right");
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// We need this in a timeout because if we call it during the CSS transition, IE11 shakes the page ¯\_(ツ)_/¯
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setTimeout(function(){
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// Focus on the TOC or the main content area, depending on which is open
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$('#main:not(.closed) #mainContent, #sidebar.open #tocView').focus();
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scrollTocToActive();
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}, 500);
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});
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// Open Settings modal
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$("#setting").click(function() {
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$("#settings-modal").toggleClass("md-show");
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});
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// On Settings input change
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$("#settings input").on("change", function() {
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// Get either the checked boolean or the assigned value
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var value = this.type === "checkbox" ? this.checked : this.value;
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// If it's purely numeric, parse it to an integer
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value = /^\d+$/.test(value) ? parseInt(value) : value;
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settings[this.name] = value;
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updatePage();
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updateScale(false);
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});
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// Close modal
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$(".closer, .overlay").click(function() {
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$(".md-show").removeClass("md-show");
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});
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// TOC thumbnail pagination
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$("#thumbnails").on("click", "a", function() {
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currentImage = $(this).data("page") - 1;
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updatePage();
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});
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// Fullscreen mode
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if (typeof screenfull !== "undefined") {
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$("#fullscreen").click(function() {
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screenfull.toggle($("#container")[0]);
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});
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if (screenfull.raw) {
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var $button = $("#fullscreen");
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document.addEventListener(screenfull.raw.fullscreenchange, function() {
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screenfull.isFullscreen
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? $button.addClass("icon-resize-small").removeClass("icon-resize-full")
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: $button.addClass("icon-resize-full").removeClass("icon-resize-small");
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});
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}
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}
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// Focus the scrollable area so that keyboard scrolling work as expected
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$('#mainContent').focus();
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$("#mainImage").click(function(evt) {
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// Firefox does not support offsetX/Y so we have to manually calculate
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// where the user clicked in the image.
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var mainContentWidth = $("#mainContent").width();
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var mainContentHeight = $("#mainContent").height();
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var comicWidth = evt.target.clientWidth;
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var comicHeight = evt.target.clientHeight;
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var offsetX = (mainContentWidth - comicWidth) / 2;
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var offsetY = (mainContentHeight - comicHeight) / 2;
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var clickX = evt.offsetX ? evt.offsetX : (evt.clientX - offsetX);
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var clickY = evt.offsetY ? evt.offsetY : (evt.clientY - offsetY);
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// Determine if the user clicked/tapped the left side or the
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// right side of the page.
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var clickedPrev = false;
|
|
switch (settings.rotateTimes) {
|
|
case 0:
|
|
clickedPrev = clickX < (comicWidth / 2);
|
|
break;
|
|
case 1:
|
|
clickedPrev = clickY < (comicHeight / 2);
|
|
break;
|
|
case 2:
|
|
clickedPrev = clickX > (comicWidth / 2);
|
|
break;
|
|
case 3:
|
|
clickedPrev = clickY > (comicHeight / 2);
|
|
break;
|
|
}
|
|
if (clickedPrev) {
|
|
showPrevPage();
|
|
} else {
|
|
showNextPage();
|
|
}
|
|
});
|
|
}
|