source: extensions/regenerateThumbnails/js/jquery.progressbar.js @ 31202

/*
 * jQuery Progress Bar plugin
 * Version 2.0 (06/22/2009)
 * @requires jQuery v1.2.1 or later
 *
 * Copyright (c) 2008 Gary Teo
 * http://t.wits.sg

USAGE:
        $(".someclass").progressBar();
        $("#progressbar").progressBar();
        $("#progressbar").progressBar(45);                                                      // percentage
        $("#progressbar").progressBar({showText: false });                      // percentage with config
        $("#progressbar").progressBar(45, {showText: false });          // percentage with config
*/
(function($) {
        $.extend({
                progressBar: new function() {

                        this.defaults = {
                                steps                   : 20,                                                                                   // steps taken to reach target
                                stepDuration    : 20,                                                                                   
                                max                             : 100,                                                                                  // Upon 100% i'd assume, but configurable
                                showText                : true,                                                                                 // show text with percentage in next to the progressbar? - default : true
                                textFormat              : 'percentage',                                                                 // Or otherwise, set to 'fraction'
                                width                   : 120,                                                                                  // Width of the progressbar - don't forget to adjust your image too!!!                                                                                          // Image to use in the progressbar. Can be a single image too: 'images/progressbg_green.gif'
                                height                  : 12,                                                                                   // Height of the progressbar - don't forget to adjust your image too!!!
                                callback                : null,                                                                                 // Calls back with the config object that has the current percentage, target percentage, current image, etc
                                boxImage                : 'images/progressbar.gif',                                             // boxImage : image around the progress bar
                                barImage                : {
                                                                        0:      'images/progressbg_red.gif',
                                                                        30: 'images/progressbg_orange.gif',
                                                                        70: 'images/progressbg_green.gif'
                                                                },
                                
                                
                                // Internal use
                                running_value   : 0,
                                value                   : 0,
                                image                   : null
                        };
                        
                        /* public methods */
                        this.construct = function(arg1, arg2) {
                                var argvalue    = null;
                                var argconfig   = null;
                                
                                if (arg1 != null) {
                                        if (!isNaN(arg1)) {
                                                argvalue = arg1;
                                                if (arg2 != null) {
                                                        argconfig = arg2;
                                                }
                                        } else {
                                                argconfig = arg1; 
                                        }
                                }
                                
                                return this.each(function(child) {
                                        var pb          = this;
                                        var config      = this.config;
                                        
                                        if (argvalue != null && this.bar != null && this.config != null) {
                                                this.config.value               = parseInt(argvalue)
                                                if (argconfig != null)
                                                        pb.config                       = $.extend(this.config, argconfig);
                                                config  = pb.config;
                                        } else {
                                                var $this                               = $(this);
                                                var config                              = $.extend({}, $.progressBar.defaults, argconfig);
                                                config.id                               = $this.attr('id') ? $this.attr('id') : Math.ceil(Math.random() * 100000);      // random id, if none provided
                                                
                                                if (argvalue == null)
                                                        argvalue        = $this.html().replace("%","")  // parse percentage
                                                
                                                config.value                    = parseInt(argvalue);
                                                config.running_value    = 0;
                                                config.image                    = getBarImage(config);
                                                
                                                var numeric = ['steps', 'stepDuration', 'max', 'width', 'height', 'running_value', 'value'];
                                                for (var i=0; i<numeric.length; i++) 
                                                        config[numeric[i]] = parseInt(config[numeric[i]]);
                                                
                                                $this.html("");
                                                var bar                                 = document.createElement('img');
                                                var text                                = document.createElement('span');
                                                var $bar                                = $(bar);
                                                var $text                               = $(text);
                                                pb.bar                                  = $bar;
                                                
                                                $bar.attr('id', config.id + "_pbImage");
                                                $text.attr('id', config.id + "_pbText");
                                                $text.html(getText(config));
                                                $bar.attr('title', getText(config));
                                                $bar.attr('alt', getText(config));
                                                $bar.attr('src', config.boxImage);
                                                $bar.attr('width', config.width);
                                                $bar.css("width", config.width + "px");
                                                $bar.css("height", config.height + "px");
                                                $bar.css("background-image", "url(" + config.image + ")");
                                                $bar.css("background-position", ((config.width * -1)) + 'px 50%');
                                                $bar.css("padding", "0");
                                                $bar.css("margin", "0");
                                                $this.append($bar);
                                                $this.append($text);
                                        }

                                        function getPercentage(config) {
                                                return config.running_value * 100 / config.max;
                                        }

                                        function getBarImage(config) {
                                                var image = config.barImage;
                                                if (typeof(config.barImage) == 'object') {
                                                        for (var i in config.barImage) {
                                                                if (config.running_value >= parseInt(i)) {
                                                                        image = config.barImage[i];
                                                                } else { break; }
                                                        }
                                                }
                                                return image;
                                        }
                                        
                                        function getText(config) {
                                                if (config.showText) {
                                                        if (config.textFormat == 'percentage') {
                                                                return " " + Math.round(config.running_value) + "%";
                                                        } else if (config.textFormat == 'fraction') {
                                                                return " " + config.running_value + '/' + config.max;
                                                        }
                                                }
                                        }
                                        
                                        config.increment = Math.round((config.value - config.running_value)/config.steps);
                                        if (config.increment < 0)
                                                config.increment *= -1;
                                        if (config.increment < 1)
                                                config.increment = 1;
                                        
                                        var t = setInterval(function() {
                                                var pixels      = config.width / 100;                   // Define how many pixels go into 1%
                                                
                                                if (config.running_value > config.value) {
                                                        if (config.running_value - config.increment  < config.value) {
                                                                config.running_value = config.value;
                                                        } else {
                                                                config.running_value -= config.increment;
                                                        }
                                                }
                                                else if (config.running_value < config.value) {
                                                        if (config.running_value + config.increment  > config.value) {
                                                                config.running_value = config.value;
                                                        } else {
                                                                config.running_value += config.increment;
                                                        }
                                                }
                                                
                                                if (config.running_value == config.value)
                                                        clearInterval(t);
                                                
                                                var $bar        = $("#" + config.id + "_pbImage");
                                                var $text       = $("#" + config.id + "_pbText");
                                                var image       = getBarImage(config);
                                                if (image != config.image) {
                                                        $bar.css("background-image", "url(" + image + ")");
                                                        config.image = image;
                                                }
                                                $bar.css("background-position", (((config.width * -1)) + (getPercentage(config) * pixels)) + 'px 50%');
                                                $bar.attr('title', getText(config));
                                                $text.html(getText(config));
                                                
                                                if (config.callback != null && typeof(config.callback) == 'function')
                                                        config.callback(config);
                                                
                                                pb.config = config;
                                        }, config.stepDuration); 
                                });
                        };
                }
        });
                
        $.fn.extend({
        progressBar: $.progressBar.construct
        });
        
})(jQuery);