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parallel-library/cps/static/js/kthoom.js

593 lines
19 KiB
JavaScript

/*
* kthoom.js
*
* Licensed under the MIT License
*
* Copyright(c) 2011 Google Inc.
* Copyright(c) 2011 antimatter15
*/
/* Reference Documentation:
* Web Workers: http://www.whatwg.org/specs/web-workers/current-work/
* Web Workers in Mozilla: https://developer.mozilla.org/En/Using_web_workers
* File API (FileReader): http://www.w3.org/TR/FileAPI/
* Typed Arrays: http://www.khronos.org/registry/typedarray/specs/latest/#6
*/
/* global bitjs */
if (window.opera) {
window.console.log = function(str) {
opera.postError(str);
};
}
var kthoom;
// gets the element with the given id
function getElem(id) {
if (document.documentElement.querySelector) {
// querySelector lookup
return document.body.querySelector("#" + id);
}
// getElementById lookup
return document.getElementById(id);
}
if (window.kthoom === undefined) {
kthoom = {};
}
// key codes
kthoom.Key = {
ESCAPE: 27,
LEFT: 37,
UP: 38,
RIGHT: 39,
DOWN: 40,
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,
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,
QUESTION_MARK: 191,
LEFT_SQUARE_BRACKET: 219,
RIGHT_SQUARE_BRACKET: 221
};
// The rotation orientation of the comic.
kthoom.rotateTimes = 0;
// global variables
var unarchiver = null;
var currentImage = 0;
var imageFiles = [];
var imageFilenames = [];
var totalImages = 0;
var lastCompletion = 0;
var hflip = false, vflip = false, fitMode = kthoom.Key.B;
var canKeyNext = true, canKeyPrev = true;
kthoom.saveSettings = function() {
localStorage.kthoomSettings = JSON.stringify({
rotateTimes: kthoom.rotateTimes,
hflip: hflip,
vflip: vflip,
fitMode: fitMode
});
};
kthoom.loadSettings = function() {
try {
if (localStorage.kthoomSettings.length < 10){
return;
}
var s = JSON.parse(localStorage.kthoomSettings);
kthoom.rotateTimes = s.rotateTimes;
hflip = s.hflip;
vflip = s.vflip;
fitMode = s.fitMode;
} catch (err) {
alert("Error load settings");
}
};
var createURLFromArray = function(array, mimeType) {
var offset = array.byteOffset, len = array.byteLength;
var url;
var blob;
// TODO: Move all this browser support testing to a common place
// and do it just once.
// Blob constructor, see http://dev.w3.org/2006/webapi/FileAPI/#dfn-Blob.
if (typeof Blob === "function") {
blob = new Blob([array], {type: mimeType});
} else {
throw "Browser support for Blobs is missing.";
}
if (blob.slice) {
blob = blob.slice(offset, offset + len, mimeType);
} else {
throw "Browser support for Blobs is missing.";
}
if ((typeof URL !== "function" && typeof URL !== "object") ||
typeof URL.createObjectURL !== "function") {
throw "Browser support for Object URLs is missing";
}
return URL.createObjectURL(blob);
};
// Stores an image filename and its data: URI.
// TODO: investigate if we really need to store as base64 (leave off ;base64 and just
// non-safe URL characters are encoded as %xx ?)
// This would save 25% on memory since base64-encoded strings are 4/3 the size of the binary
kthoom.ImageFile = function(file) {
this.filename = file.filename;
var fileExtension = file.filename.split(".").pop().toLowerCase();
var mimeType = fileExtension === "png" ? "image/png" :
(fileExtension === "jpg" || fileExtension === "jpeg") ? "image/jpeg" :
fileExtension === "gif" ? "image/gif" : null;
this.dataURI = createURLFromArray(file.fileData, mimeType);
this.data = file;
};
kthoom.initProgressMeter = function() {
var svgns = "http://www.w3.org/2000/svg";
var pdiv = $("#progress")[0];
var svg = document.createElementNS(svgns, "svg");
svg.style.width = "100%";
svg.style.height = "100%";
var defs = document.createElementNS(svgns, "defs");
var patt = document.createElementNS(svgns, "pattern");
patt.id = "progress_pattern";
patt.setAttribute("width", "30");
patt.setAttribute("height", "20");
patt.setAttribute("patternUnits", "userSpaceOnUse");
var rect = document.createElementNS(svgns, "rect");
rect.setAttribute("width", "100%");
rect.setAttribute("height", "100%");
rect.setAttribute("fill", "#cc2929");
var poly = document.createElementNS(svgns, "polygon");
poly.setAttribute("fill", "yellow");
poly.setAttribute("points", "15,0 30,0 15,20 0,20");
patt.appendChild(rect);
patt.appendChild(poly);
defs.appendChild(patt);
svg.appendChild(defs);
var g = document.createElementNS(svgns, "g");
var outline = document.createElementNS(svgns, "rect");
outline.setAttribute("y", "1");
outline.setAttribute("width", "100%");
outline.setAttribute("height", "15");
outline.setAttribute("fill", "#777");
outline.setAttribute("stroke", "white");
outline.setAttribute("rx", "5");
outline.setAttribute("ry", "5");
g.appendChild(outline);
var title = document.createElementNS(svgns, "text");
title.id = "progress_title";
title.appendChild(document.createTextNode("0%"));
title.setAttribute("y", "13");
title.setAttribute("x", "99.5%");
title.setAttribute("fill", "white");
title.setAttribute("font-size", "12px");
title.setAttribute("text-anchor", "end");
g.appendChild(title);
var meter = document.createElementNS(svgns, "rect");
meter.id = "meter";
meter.setAttribute("width", "0%");
meter.setAttribute("height", "17");
meter.setAttribute("fill", "url(#progress_pattern)");
meter.setAttribute("rx", "5");
meter.setAttribute("ry", "5");
var meter2 = document.createElementNS(svgns, "rect");
meter2.id = "meter2";
meter2.setAttribute("width", "0%");
meter2.setAttribute("height", "17");
meter2.setAttribute("opacity", "0.8");
meter2.setAttribute("fill", "#007fff");
meter2.setAttribute("rx", "5");
meter2.setAttribute("ry", "5");
g.appendChild(meter);
g.appendChild(meter2);
var page = document.createElementNS(svgns, "text");
page.id = "page";
page.appendChild(document.createTextNode("0/0"));
page.setAttribute("y", "13");
page.setAttribute("x", "0.5%");
page.setAttribute("fill", "white");
page.setAttribute("font-size", "12px");
g.appendChild(page);
svg.appendChild(g);
pdiv.appendChild(svg);
var l;
svg.onclick = function(e) {
for (var x = pdiv, l = 0; x !== document.documentElement; x = x.parentNode) l += x.offsetLeft;
var page = Math.max(1, Math.ceil(((e.clientX - l) / pdiv.offsetWidth) * totalImages)) - 1;
currentImage = page;
updatePage();
};
}
kthoom.setProgressMeter = function(pct, optLabel) {
pct = (pct * 100);
var part = 1 / totalImages;
var remain = ((pct - lastCompletion) / 100) / part;
var fract = Math.min(1, remain);
var smartpct = ((imageFiles.length / totalImages) + (fract * part)) * 100;
if (totalImages === 0) smartpct = pct;
// + Math.min((pct - lastCompletion), 100/totalImages * 0.9 + (pct - lastCompletion - 100/totalImages)/2, 100/totalImages);
var oldval = parseFloat(getElem("meter").getAttribute("width"));
if (isNaN(oldval)) oldval = 0;
var weight = 0.5;
smartpct = ((weight * smartpct) + ((1 - weight) * oldval));
if (pct === 100) smartpct = 100;
if (!isNaN(smartpct)) {
getElem("meter").setAttribute("width", smartpct + "%");
}
var title = getElem("progress_title");
while (title.firstChild) title.removeChild(title.firstChild);
var labelText = pct.toFixed(2) + "% " + imageFiles.length + "/" + totalImages + "";
if (optLabel) {
labelText = optLabel + " " + labelText;
}
title.appendChild(document.createTextNode(labelText));
getElem("meter2").setAttribute("width",
100 * (totalImages === 0 ? 0 : ((currentImage + 1) / totalImages)) + "%");
var titlePage = getElem("page");
while (titlePage.firstChild) titlePage.removeChild(titlePage.firstChild);
titlePage.appendChild(document.createTextNode( (currentImage + 1) + "/" + totalImages ));
if (pct > 0) {
//getElem('nav').className = '';
getElem("progress").className = "";
}
}
function loadFromArrayBuffer(ab) {
var start = (new Date).getTime();
var h = new Uint8Array(ab, 0, 10);
var pathToBitJS = "../../static/js/";
if (h[0] === 0x52 && h[1] === 0x61 && h[2] === 0x72 && h[3] === 0x21) { //Rar!
unarchiver = new bitjs.archive.Unrarrer(ab, pathToBitJS);
} else if (h[0] === 80 && h[1] === 75) { //PK (Zip)
unarchiver = new bitjs.archive.Unzipper(ab, pathToBitJS);
} else { // Try with tar
unarchiver = new bitjs.archive.Untarrer(ab, pathToBitJS);
}
// Listen for UnarchiveEvents.
if (unarchiver) {
unarchiver.addEventListener(bitjs.archive.UnarchiveEvent.Type.PROGRESS,
function(e) {
var percentage = e.currentBytesUnarchived / e.totalUncompressedBytesInArchive;
totalImages = e.totalFilesInArchive;
kthoom.setProgressMeter(percentage, "Unzipping");
// display nav
lastCompletion = percentage * 100;
});
unarchiver.addEventListener(bitjs.archive.UnarchiveEvent.Type.EXTRACT,
function(e) {
// convert DecompressedFile into a bunch of ImageFiles
if (e.unarchivedFile) {
var f = e.unarchivedFile;
// add any new pages based on the filename
if (imageFilenames.indexOf(f.filename) === -1) {
imageFilenames.push(f.filename);
imageFiles.push(new kthoom.ImageFile(f));
}
}
// display first page if we haven't yet
if (imageFiles.length === currentImage + 1) {
updatePage();
}
});
unarchiver.addEventListener(bitjs.archive.UnarchiveEvent.Type.FINISH,
function() {
var diff = ((new Date).getTime() - start) / 1000;
console.log("Unarchiving done in " + diff + "s");
});
unarchiver.start();
} else {
alert("Some error");
}
}
function updatePage() {
var title = getElem("page");
while (title.firstChild) title.removeChild(title.firstChild);
title.appendChild(document.createTextNode( (currentImage + 1 ) + "/" + totalImages ));
getElem("meter2").setAttribute("width",
100 * (totalImages === 0 ? 0 : ((currentImage + 1 ) / totalImages)) + "%");
if (imageFiles[currentImage]) {
setImage(imageFiles[currentImage].dataURI);
} else {
setImage("loading");
}
}
function setImage(url) {
var canvas = $("#mainImage")[0];
var x = $("#mainImage")[0].getContext("2d");
$("#mainText").hide();
if (url === "loading") {
updateScale(true);
canvas.width = innerWidth - 100;
canvas.height = 200;
x.fillStyle = "red";
x.font = "50px sans-serif";
x.strokeStyle = "black";
x.fillText("Loading Page #" + (currentImage + 1), 100, 100);
} else {
if ($("body").css("scrollHeight") / innerHeight > 1) {
$("body").css("overflowY", "scroll");
}
var img = new Image();
img.onerror = function() {
canvas.width = innerWidth - 100;
canvas.height = 300;
updateScale(true);
x.fillStyle = "orange";
x.font = "50px sans-serif";
x.strokeStyle = "black";
x.fillText("Page #" + (currentImage + 1) + " (" +
imageFiles[currentImage].filename + ")", 100, 100);
x.fillStyle = "red";
x.fillText("Is corrupt or not an image", 100, 200);
var xhr = new XMLHttpRequest();
if (/(html|htm)$/.test(imageFiles[currentImage].filename)) {
xhr.open("GET", url, true);
xhr.onload = function() {
//document.getElementById('mainText').style.display = '';
$("#mainText").css("display", "");
$("#mainText").innerHTML("<iframe style=\"width:100%;height:700px;border:0\" src=\"data:text/html," + escape(xhr.responseText) + "\"></iframe>");
}
xhr.send(null);
} else if (!/(jpg|jpeg|png|gif)$/.test(imageFiles[currentImage].filename) && imageFiles[currentImage].data.uncompressedSize < 10 * 1024) {
xhr.open("GET", url, true);
xhr.onload = function() {
$("#mainText").css("display", "");
$("#mainText").innerText(xhr.responseText);
};
xhr.send(null);
}
};
img.onload = function() {
var h = img.height,
w = img.width,
sw = w,
sh = h;
kthoom.rotateTimes = (4 + kthoom.rotateTimes) % 4;
x.save();
if (kthoom.rotateTimes % 2 === 1) {
sh = w;
sw = h;
}
canvas.height = sh;
canvas.width = sw;
x.translate(sw / 2, sh / 2);
x.rotate(Math.PI / 2 * kthoom.rotateTimes);
x.translate(-w / 2, -h / 2);
if (vflip) {
x.scale(1, -1);
x.translate(0, -h);
}
if (hflip) {
x.scale(-1, 1);
x.translate(-w, 0);
}
canvas.style.display = "none";
scrollTo(0, 0);
x.drawImage(img, 0, 0);
updateScale();
canvas.style.display = "";
$("body").css("overflowY", "");
x.restore();
};
img.src = url;
}
}
function showPrevPage() {
currentImage--;
if (currentImage < 0) {
// Freeze on the current page.
currentImage++;
} else {
updatePage();
}
}
function showNextPage() {
currentImage++;
if (currentImage >= Math.max(totalImages, imageFiles.length)) {
// Freeze on the current page.
currentImage--;
} else {
updatePage();
}
}
function updateScale(clear) {
var mainImageStyle = getElem("mainImage").style;
mainImageStyle.width = "";
mainImageStyle.height = "";
mainImageStyle.maxWidth = "";
mainImageStyle.maxHeight = "";
var maxheight = innerHeight - 15;
if (!/main/.test(getElem("titlebar").className)) {
maxheight -= 25;
}
if (clear || fitMode === kthoom.Key.N) {
} else if (fitMode === kthoom.Key.B) {
mainImageStyle.maxWidth = "100%";
mainImageStyle.maxHeight = maxheight + "px";
} else if (fitMode === kthoom.Key.H) {
mainImageStyle.height = maxheight + "px";
} else if (fitMode === kthoom.Key.W) {
mainImageStyle.width = "100%";
}
kthoom.saveSettings();
}
function keyHandler(evt) {
var code = evt.keyCode;
if ($("#progress").css("display") === "none"){
return;
}
canKeyNext = (($("body").css("offsetWidth") + $("body").css("scrollLeft")) / $("body").css("scrollWidth")) >= 1;
canKeyPrev = (scrollX <= 0);
if (evt.ctrlKey || evt.shiftKey || evt.metaKey) return;
switch (code) {
case kthoom.Key.LEFT:
if (canKeyPrev) showPrevPage();
break;
case kthoom.Key.RIGHT:
if (canKeyNext) showNextPage();
break;
case kthoom.Key.L:
kthoom.rotateTimes--;
if (kthoom.rotateTimes < 0) {
kthoom.rotateTimes = 3;
}
updatePage();
break;
case kthoom.Key.R:
kthoom.rotateTimes++;
if (kthoom.rotateTimes > 3) {
kthoom.rotateTimes = 0;
}
updatePage();
break;
case kthoom.Key.F:
if (!hflip && !vflip) {
hflip = true;
} else if (hflip === true) {
vflip = true;
hflip = false;
} else if (vflip === true) {
vflip = false;
}
updatePage();
break;
case kthoom.Key.W:
fitMode = kthoom.Key.W;
updateScale();
break;
case kthoom.Key.H:
fitMode = kthoom.Key.H;
updateScale();
break;
case kthoom.Key.B:
fitMode = kthoom.Key.B;
updateScale();
break;
case kthoom.Key.N:
fitMode = kthoom.Key.N;
updateScale();
break;
default:
//console.log('KeyCode = ' + code);
break;
}
}
function init(filename) {
if (!window.FileReader) {
alert("Sorry, kthoom will not work with your browser because it does not support the File API. Please try kthoom with Chrome 12+ or Firefox 7+");
} else {
var request = new XMLHttpRequest();
request.open("GET", filename);
request.responseType = "arraybuffer";
request.setRequestHeader("X-Test", "test1");
request.setRequestHeader("X-Test", "test2");
request.addEventListener("load", function(event) {
if (request.status >= 200 && request.status < 300) {
loadFromArrayBuffer(request.response);
} else {
console.warn(request.statusText, request.responseText);
}
});
request.send();
kthoom.initProgressMeter();
document.body.className += /AppleWebKit/.test(navigator.userAgent) ? " webkit" : "";
updateScale(true);
kthoom.loadSettings();
$(document).keydown(keyHandler);
$(window).resize(function() {
var f = (screen.width - innerWidth < 4 && screen.height - innerHeight < 4);
getElem("titlebar").className = f ? "main" : "";
updateScale();
});
$("#mainImage").click(function(evt) {
// Firefox does not support offsetX/Y so we have to manually calculate
// where the user clicked in the image.
var mainContentWidth = $("#mainContent").width();
var mainContentHeight = $("#mainContent").height();
var comicWidth = evt.target.clientWidth;
var comicHeight = evt.target.clientHeight;
var offsetX = (mainContentWidth - comicWidth) / 2;
var offsetY = (mainContentHeight - comicHeight) / 2;
var clickX = !!evt.offsetX ? evt.offsetX : (evt.clientX - offsetX);
var clickY = !!evt.offsetY ? evt.offsetY : (evt.clientY - offsetY);
// Determine if the user clicked/tapped the left side or the
// right side of the page.
var clickedPrev = false;
switch (kthoom.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();
}
});
}
}