845 lines
23 KiB
JavaScript
Executable file
845 lines
23 KiB
JavaScript
Executable file
/* exported ComicBook */
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/*
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TODOs:
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Fo sho:
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- create onclose callback, show close button only if set
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_ fix progress bar css
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- only trigger navigate event on page change (not resize, etc.)
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- fix manga mode
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- trigger preload if requesting valid but not loaded images (can happen if network was interupted)
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- loading and generally hackiness of pointer is buggy, fix.
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- check for html5 feature support where used: diveintohtml5.org/everything.html or www.modernizr.com
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- full browser test - IE9 / FF3.6+ / Chrome / Safari / Opera
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Nice 2 have:
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- remove image inhancement lag when navigating by pre-applying enhancements to other pages
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- jump to page?
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- make page draggable with the cursor
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- enable menu items via config, allow for custom items
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- split out classes into seperate files
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- thumbnail browser
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- refactor so we are not using all these loose shared variables and other nastyness
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- use custom event emitters instead of hacky code
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- properly bind 'this' so we don't have to keep using 'self'
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- allow toolbar to be sticky
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*/
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var ComicBook = (function ($) {
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'use strict';
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/**
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* Merge two arrays. Any properties in b will replace the same properties in
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* a. New properties from b will be added to a.
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*
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* @param a {Object}
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* @param b {Object}
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*/
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function merge(a, b) {
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var prop;
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if (typeof b === 'undefined') { b = {}; }
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for (prop in a) {
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if (a.hasOwnProperty(prop)) {
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if (prop in b) { continue; }
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b[prop] = a[prop];
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}
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}
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return b;
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}
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/**
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* Exception class. Always throw an instance of this when throwing exceptions.
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*
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* @param {String} type
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* @param {Object} object
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* @returns {ComicBookException}
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*/
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var ComicBookException = {
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INVALID_ACTION: 'invalid action',
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INVALID_PAGE: 'invalid page',
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INVALID_PAGE_TYPE: 'invalid page type',
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UNDEFINED_CONTROL: 'undefined control',
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INVALID_ZOOM_MODE: 'invalid zoom mode',
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INVALID_NAVIGATION_EVENT: 'invalid navigation event'
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};
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function ComicBook(id, srcs, opts) {
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var self = this;
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var canvas_id = id; // canvas element id
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this.srcs = srcs; // array of image srcs for pages
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var defaults = {
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displayMode: 'double', // single / double
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zoomMode: 'fitWidth', // manual / fitWidth
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manga: false, // true / false
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enhance: {},
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keyboard: {
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next: 78,
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previous: 80,
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toolbar: 84,
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toggleLayout: 76
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},
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libPath: '/lib/'
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};
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this.isMobile = false;
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// mobile enhancements
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if (navigator.userAgent.match(/mobile/i)) {
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this.isMobile = true;
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document.body.classList.add('mobile');
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defaults.displayMode = 'single';
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window.addEventListener('load', function () {
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setTimeout(function () {
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window.scrollTo(0, 1);
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}, 0);
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});
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}
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var options = merge(defaults, opts); // options array for internal use
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var no_pages = srcs.length;
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var pages = []; // array of preloaded Image objects
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var canvas; // the HTML5 canvas object
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var context; // the 2d drawing context
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var loaded = []; // the images that have been loaded so far
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var scale = 1; // page zoom scale, 1 = 100%
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var is_double_page_spread = false;
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var controlsRendered = false; // have the user controls been inserted into the dom yet?
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var page_requested = false; // used to request non preloaded pages
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var shiv = false;
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/**
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* Gets the window.innerWidth - scrollbars
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*/
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function windowWidth() {
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var height = window.innerHeight + 1;
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if (shiv === false) {
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shiv = $(document.createElement('div'))
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.attr('id', 'cb-width-shiv')
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.css({
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width: '100%',
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position: 'absolute',
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top: 0,
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zIndex: '-1000'
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});
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$('body').append(shiv);
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}
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shiv.height(height);
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return shiv.innerWidth();
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}
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/**
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* enables the back button
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*/
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function checkHash() {
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var hash = getHash();
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if (hash !== pointer && loaded.indexOf(hash) > -1) {
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pointer = hash;
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self.draw();
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}
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}
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function getHash() {
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var hash = parseInt(location.hash.substring(1),10) - 1 || 0;
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if (hash < 0) {
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setHash(0);
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hash = 0;
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}
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return hash;
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}
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function setHash(pageNo) {
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location.hash = pageNo;
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}
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// page hash on first load
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var hash = getHash();
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// the current page, can pass a default as a url hash
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var pointer = (hash < srcs.length) ? hash : 0;
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/**
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* Setup the canvas element for use throughout the class.
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*
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* @see #ComicBook.prototype.draw
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* @see #ComicBook.prototype.enhance
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*/
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function init() {
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// setup canvas
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canvas = document.getElementById(canvas_id);
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context = canvas.getContext('2d');
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// render user controls
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if (controlsRendered === false) {
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self.renderControls();
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controlsRendered = true;
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}
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// add page controls
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window.addEventListener('keydown', self.navigation, false);
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window.addEventListener('hashchange', checkHash, false);
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}
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window.addEventListener('touchstart', function (e) {
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var $el = $(e.target);
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if ($el.data('toggle') === 'dropdown' ) {
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$el.siblings('.dropdown').toggle();
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}
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}, false);
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/**
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* Render Handlebars templates. Templates with data-trigger & data-action will
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* have the specified events bound.
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*/
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ComicBook.prototype.renderControls = function () {
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var controls = {};
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$.each(Handlebars.templates, function (name, template) {
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var $template = $(template().trim());
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controls[name] = $template;
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// add event listeners to controls that specify callbacks
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$template.find('*').andSelf().filter('[data-action][data-trigger]').each(function () {
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var $this = $(this);
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var trigger = $this.data('trigger');
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var action = $this.data('action');
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// trigger a direct method if exists
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if (typeof self[$this.data('action')] === 'function') {
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$this.on(trigger, self[action]);
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}
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// throw an event to be caught outside if the app code
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$this.on(trigger, function (e) {
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$(self).trigger(trigger, e);
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});
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});
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$(canvas).before($template);
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});
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this.controls = controls;
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};
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ComicBook.prototype.getControl = function (control) {
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if (typeof this.controls[control] !== 'object') {
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throw ComicBookException.UNDEFINED_CONTROL + ' ' + control;
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}
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return this.controls[control];
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};
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ComicBook.prototype.showControl = function (control) {
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this.getControl(control).show().addClass('open');
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};
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ComicBook.prototype.hideControl = function (control) {
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this.getControl(control).removeClass('open').hide();
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};
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ComicBook.prototype.toggleControl = function (control) {
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this.getControl(control).toggle().toggleClass('open');
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};
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ComicBook.prototype.toggleLayout = function() {
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var $control = self.getControl('toolbar').find('[data-action=toggleLayout]');
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var displayMode = (options.displayMode === 'single') ? 'double' : 'single';
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$control.removeClass(options.displayMode);
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$control.addClass(displayMode);
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options.displayMode = displayMode;
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self.drawPage();
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};
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/**
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* Get the image for a given page.
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*
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* @return Image
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*/
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ComicBook.prototype.getPage = function (i) {
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if (i < 0 || i > srcs.length-1) {
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throw ComicBookException.INVALID_PAGE + ' ' + i;
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}
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if (typeof pages[i] === 'object') {
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return pages[i];
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} else {
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page_requested = i;
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this.showControl('loadingOverlay');
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}
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};
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/**
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* @see #preload
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*/
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ComicBook.prototype.draw = function () {
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init();
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// resize navigation controls
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$('.navigate').outerHeight(window.innerHeight);
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$('#cb-loading-overlay').outerWidth(windowWidth()).height(window.innerHeight);
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// preload images if needed
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if (pages.length !== no_pages) {
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this.preload();
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} else {
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this.drawPage();
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}
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};
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/**
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* Zoom the canvas
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*
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* @param new_scale {Number} Scale the canvas to this ratio
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*/
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ComicBook.prototype.zoom = function (new_scale) {
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options.zoomMode = 'manual';
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scale = new_scale;
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if (typeof this.getPage(pointer) === 'object') { this.drawPage(); }
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};
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ComicBook.prototype.zoomIn = function () {
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self.zoom(scale + 0.1);
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};
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ComicBook.prototype.zoomOut = function () {
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self.zoom(scale - 0.1);
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};
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ComicBook.prototype.fitWidth = function () {
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options.zoomMode = 'fitWidth';
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ComicBook.prototype.drawPage();
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};
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/**
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* Preload all images, draw the page only after a given number have been loaded.
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*
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* @see #drawPage
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*/
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ComicBook.prototype.preload = function () {
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var i = pointer; // the current page counter for this method
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var rendered = false;
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var queue = [];
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this.showControl('loadingOverlay');
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function loadImage(i) {
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var page = new Image();
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page.src = srcs[i];
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page.onload = function () {
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pages[i] = this;
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loaded.push(i);
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$('#cb-progress-bar .progressbar-value').css('width', Math.floor((loaded.length / no_pages) * 100) + '%');
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// double page mode needs an extra page added
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var buffer = (options.displayMode === 'double' && pointer < srcs.length-1) ? 1 : 0;
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// start rendering the comic when the requested page is ready
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if ((rendered === false && ($.inArray(pointer + buffer, loaded) !== -1) ||
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(typeof page_requested === 'number' && $.inArray(page_requested, loaded) !== -1))
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) {
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// if the user is waiting for a page to be loaded, render that one instead of the default pointer
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if (typeof page_requested === 'number') {
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pointer = page_requested-1;
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page_requested = false;
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}
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self.drawPage();
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self.hideControl('loadingOverlay');
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rendered = true;
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}
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if (queue.length) {
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loadImage(queue[0]);
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queue.splice(0,1);
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} else {
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$('#cb-status').delay(500).fadeOut();
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}
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};
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}
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// loads pages in both directions so you don't have to wait for all pages
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// to be loaded before you can scroll backwards
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function preload(start, stop) {
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var forward_buffer = 3; // TODO: make this into a config option?
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var j = 0;
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var count = 1;
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var forward = start;
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var backward = start-1;
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while (forward <= stop) {
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if (count > forward_buffer && backward > -1) {
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queue.push(backward);
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backward--;
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count = 0;
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} else {
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queue.push(forward);
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forward++;
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}
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count++;
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}
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while (backward > -1) {
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queue.push(backward);
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backward--;
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}
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loadImage(queue[j]);
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}
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preload(i, srcs.length-1);
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};
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ComicBook.prototype.pageLoaded = function (page_no) {
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return (typeof loaded[page_no-1] !== 'undefined');
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};
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/**
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* Draw the current page in the canvas
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*/
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ComicBook.prototype.drawPage = function(page_no, reset_scroll) {
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var scrollY;
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reset_scroll = (typeof reset_scroll !== 'undefined') ? reset_scroll : true;
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scrollY = reset_scroll ? 0 : window.scrollY;
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// if a specific page is given try to render it, if not bail and wait for preload() to render it
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if (typeof page_no === 'number' && page_no < srcs.length && page_no > 0) {
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pointer = page_no-1;
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if (!this.pageLoaded(page_no)) {
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this.showControl('loadingOverlay');
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return;
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}
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}
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if (pointer < 0) { pointer = 0; }
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var zoom_scale;
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var offsetW = 0, offsetH = 0;
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var page = self.getPage(pointer);
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var page2 = false;
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if (options.displayMode === 'double' && pointer < srcs.length-1) {
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page2 = self.getPage(pointer + 1);
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}
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if (typeof page !== 'object') {
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throw ComicBookException.INVALID_PAGE_TYPE + ' ' + typeof page;
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}
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var width = page.width;
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// reset the canvas to stop duplicate pages showing
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canvas.width = 0;
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canvas.height = 0;
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// show double page spreads on a single page
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is_double_page_spread = (
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typeof page2 === 'object' &&
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(page.width > page.height || page2.width > page2.height) &&
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options.displayMode === 'double'
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);
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if (is_double_page_spread) { options.displayMode = 'single'; }
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if (options.displayMode === 'double') {
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// for double page spreads, factor in the width of both pages
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if (typeof page2 === 'object') { width += page2.width; }
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// if this is the last page and there is no page2, still keep the canvas wide
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else { width += width; }
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}
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// update the page scale if a non manual mode has been chosen
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switch (options.zoomMode) {
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case 'manual':
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document.body.style.overflowX = 'auto';
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zoom_scale = (options.displayMode === 'double') ? scale * 2 : scale;
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break;
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case 'fitWidth':
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document.body.style.overflowX = 'hidden';
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// scale up if the window is wider than the page, scale down if the window
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// is narrower than the page
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zoom_scale = (windowWidth() > width) ? ((windowWidth() - width) / windowWidth()) + 1 : windowWidth() / width;
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// update the interal scale var so switching zoomModes while zooming will be smooth
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scale = zoom_scale;
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break;
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default:
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throw ComicBookException.INVALID_ZOOM_MODE + ' ' + options.zoomMode;
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}
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var canvas_width = page.width * zoom_scale;
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var canvas_height = page.height * zoom_scale;
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var page_width = (options.zoomMode === 'manual') ? page.width * scale : canvas_width;
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var page_height = (options.zoomMode === 'manual') ? page.height * scale : canvas_height;
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canvas_height = page_height;
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// make sure the canvas is always at least full screen, even if the page is more narrow than the screen
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canvas.width = (canvas_width < windowWidth()) ? windowWidth() : canvas_width;
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canvas.height = (canvas_height < window.innerHeight) ? window.innerHeight : canvas_height;
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// work out a horizontal position that will keep the pages always centred
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if (canvas_width < windowWidth() && options.zoomMode === 'manual') {
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offsetW = (windowWidth() - page_width) / 2;
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if (options.displayMode === 'double') { offsetW = offsetW - page_width / 2; }
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}
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// work out a vertical position that will keep the pages always centred
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if (canvas_height < window.innerHeight && options.zoomMode === 'manual') {
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offsetH = (window.innerHeight - page_height) / 2;
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}
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// in manga double page mode reverse the page(s)
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if (options.manga && options.displayMode === 'double' && typeof page2 === 'object') {
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var tmpPage = page;
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var tmpPage2 = page2;
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page = tmpPage2;
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page2 = tmpPage;
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}
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// draw the page(s)
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context.drawImage(page, offsetW, offsetH, page_width, page_height);
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if (options.displayMode === 'double' && typeof page2 === 'object') {
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context.drawImage(page2, page_width + offsetW, offsetH, page_width, page_height);
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}
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this.pixastic = new Pixastic(context, options.libPath + 'pixastic/');
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// apply any image enhancements previously defined
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$.each(options.enhance, function(action, options) {
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self.enhance[action](options);
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});
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var current_page =
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(options.displayMode === 'double' &&
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pointer + 2 <= srcs.length) ? (pointer + 1) + '-' + (pointer + 2) : pointer + 1;
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this.getControl('toolbar')
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.find('#current-page').text(current_page)
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.end()
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.find('#page-count').text(srcs.length);
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// revert page mode back to double if it was auto switched for a double page spread
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if (is_double_page_spread) { options.displayMode = 'double'; }
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// disable the fit width button if needed
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$('button.cb-fit-width').attr('disabled', (options.zoomMode === 'fitWidth'));
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// disable prev/next buttons if not needed
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$('.navigate').show();
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if (pointer === 0) {
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$('.navigate-left').hide();
|
|
$('.navigate-right').show();
|
|
}
|
|
|
|
if (pointer === srcs.length-1 || (typeof page2 === 'object' && pointer === srcs.length-2)) {
|
|
$('.navigate-left').show();
|
|
$('.navigate-right').hide();
|
|
}
|
|
|
|
$(this).trigger('navigate');
|
|
|
|
// update hash location
|
|
if (getHash() !== pointer) {
|
|
setHash(pointer + 1);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Increment the counter and draw the page in the canvas
|
|
*
|
|
* @see #drawPage
|
|
*/
|
|
ComicBook.prototype.drawNextPage = function () {
|
|
|
|
var page;
|
|
|
|
try {
|
|
page = self.getPage(pointer+1);
|
|
} catch (e) {}
|
|
|
|
if (!page) { return false; }
|
|
|
|
if (pointer + 1 < pages.length) {
|
|
pointer += (options.displayMode === 'single' || is_double_page_spread) ? 1 : 2;
|
|
try {
|
|
self.drawPage();
|
|
} catch (e) {}
|
|
}
|
|
|
|
// make sure the top of the page is in view
|
|
window.scroll(0, 0);
|
|
};
|
|
|
|
/**
|
|
* Decrement the counter and draw the page in the canvas
|
|
*
|
|
* @see #drawPage
|
|
*/
|
|
ComicBook.prototype.drawPrevPage = function () {
|
|
|
|
var page;
|
|
|
|
try {
|
|
page = self.getPage(pointer-1);
|
|
} catch (e) {}
|
|
|
|
if (!page) { return false; }
|
|
|
|
is_double_page_spread = (page.width > page.height); // need to run double page check again here as we are going backwards
|
|
|
|
if (pointer > 0) {
|
|
pointer -= (options.displayMode === 'single' || is_double_page_spread) ? 1 : 2;
|
|
self.drawPage();
|
|
}
|
|
|
|
// make sure the top of the page is in view
|
|
window.scroll(0, 0);
|
|
};
|
|
|
|
ComicBook.prototype.brightness = function () {
|
|
self.enhance.brightness({ brightness: $(this).val() });
|
|
};
|
|
|
|
ComicBook.prototype.contrast = function () {
|
|
self.enhance.brightness({ contrast: $(this).val() });
|
|
};
|
|
|
|
ComicBook.prototype.sharpen = function () {
|
|
self.enhance.sharpen({ strength: $(this).val() });
|
|
};
|
|
|
|
ComicBook.prototype.desaturate = function () {
|
|
if ($(this).is(':checked')) {
|
|
self.enhance.desaturate();
|
|
} else {
|
|
self.enhance.resaturate();
|
|
}
|
|
};
|
|
|
|
ComicBook.prototype.resetEnhancements = function () {
|
|
self.enhance.reset();
|
|
};
|
|
|
|
/**
|
|
* Apply image enhancements to the canvas.
|
|
*
|
|
* Powered by the awesome Pixastic: http://www.pixastic.com/
|
|
*
|
|
* TODO: reset & apply all image enhancements each time before applying new one
|
|
* TODO: abstract this into an 'Enhance' object, separate from ComicBook?
|
|
*/
|
|
ComicBook.prototype.enhance = {
|
|
|
|
/**
|
|
* Reset enhancements.
|
|
* This can reset a specific enhancement if the method name is passed, or
|
|
* it will reset all.
|
|
*
|
|
* @param method {string} the specific enhancement to reset
|
|
*/
|
|
reset: function (method) {
|
|
if (!method) {
|
|
options.enhance = {};
|
|
} else {
|
|
delete options.enhance[method];
|
|
}
|
|
self.drawPage(null, false);
|
|
},
|
|
|
|
/**
|
|
* Pixastic progress callback
|
|
* @param {float} progress
|
|
*/
|
|
// progress: function (progress) {
|
|
progress: function () {
|
|
// console.info(Math.floor(progress * 100));
|
|
},
|
|
|
|
/**
|
|
* Pixastic on complete callback
|
|
*/
|
|
done: function () {
|
|
|
|
},
|
|
|
|
/**
|
|
* Adjust brightness / contrast
|
|
*
|
|
* params
|
|
* brightness (int) -150 to 150
|
|
* contrast: (float) -1 to infinity
|
|
*
|
|
* @param {Object} params Brightness & contrast levels
|
|
* @param {Boolean} reset Reset before applying more enhancements?
|
|
*/
|
|
brightness: function (params, reset) {
|
|
|
|
if (reset !== false) { this.reset('brightness'); }
|
|
|
|
// merge user options with defaults
|
|
var opts = merge({ brightness: 0, contrast: 0 }, params);
|
|
|
|
// remember options for later
|
|
options.enhance.brightness = opts;
|
|
|
|
// run the enhancement
|
|
self.pixastic.brightness({
|
|
brightness: opts.brightness,
|
|
contrast: opts.contrast
|
|
}).done(this.done, this.progress);
|
|
},
|
|
|
|
/**
|
|
* Force black and white
|
|
*/
|
|
desaturate: function () {
|
|
options.enhance.desaturate = {};
|
|
self.pixastic.desaturate().done(this.done, this.progress);
|
|
},
|
|
|
|
/**
|
|
* Undo desaturate
|
|
*/
|
|
resaturate: function() {
|
|
delete options.enhance.desaturate;
|
|
self.drawPage(null, false);
|
|
},
|
|
|
|
/**
|
|
* Sharpen
|
|
*
|
|
* options:
|
|
* strength: number (-1 to infinity)
|
|
*
|
|
* @param {Object} options
|
|
*/
|
|
sharpen: function (params) {
|
|
|
|
this.desharpen();
|
|
|
|
var opts = merge({ strength: 0 }, params);
|
|
|
|
options.enhance.sharpen = opts;
|
|
|
|
self.pixastic.sharpen3x3({
|
|
strength: opts.strength
|
|
}).done(this.done, this.progress);
|
|
},
|
|
|
|
desharpen: function() {
|
|
delete options.enhance.sharpen;
|
|
self.drawPage(null, false);
|
|
}
|
|
};
|
|
|
|
ComicBook.prototype.navigation = function (e) {
|
|
|
|
// disable navigation when the overlay is showing
|
|
if ($('#cb-loading-overlay').is(':visible')) { return false; }
|
|
|
|
var side = false;
|
|
|
|
switch (e.type) {
|
|
|
|
case 'keydown':
|
|
|
|
// navigation
|
|
if (e.keyCode === options.keyboard.previous) { side = 'left'; }
|
|
if (e.keyCode === options.keyboard.next) { side = 'right'; }
|
|
|
|
// display controls
|
|
if (e.keyCode === options.keyboard.toolbar) {
|
|
self.toggleToolbar();
|
|
}
|
|
if (e.keyCode === options.keyboard.toggleLayout) {
|
|
self.toggleLayout();
|
|
}
|
|
break;
|
|
|
|
default:
|
|
throw ComicBookException.INVALID_NAVIGATION_EVENT + ' ' + e.type;
|
|
}
|
|
|
|
if (side) {
|
|
|
|
e.stopPropagation();
|
|
|
|
// western style (left to right)
|
|
if (!options.manga) {
|
|
if (side === 'left') { self.drawPrevPage(); }
|
|
if (side === 'right') { self.drawNextPage(); }
|
|
}
|
|
// manga style (right to left)
|
|
else {
|
|
if (side === 'left') { self.drawNextPage(); }
|
|
if (side === 'right') { self.drawPrevPage(); }
|
|
}
|
|
|
|
return false;
|
|
}
|
|
};
|
|
|
|
ComicBook.prototype.destroy = function () {
|
|
|
|
$.each(this.controls, function (name, $control) {
|
|
$control.remove();
|
|
});
|
|
|
|
canvas.width = 0;
|
|
canvas.height = 0;
|
|
|
|
window.removeEventListener('keydown', this.navigation, false);
|
|
window.removeEventListener('hashchange', checkHash, false);
|
|
|
|
setHash('');
|
|
|
|
// $(this).trigger('destroy');
|
|
};
|
|
|
|
}
|
|
|
|
return ComicBook;
|
|
|
|
})(jQuery);
|