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Filename : bootstrap-colorpicker.js
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/*!
 * Bootstrap Colorpicker
 * http://mjolnic.github.io/bootstrap-colorpicker/
 *
 * Originally written by (c) 2012 Stefan Petre
 * Licensed under the Apache License v2.0
 * http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 * @todo Update DOCS
 */
(function($) {
    'use strict';

    // Color object
    var Color = function(val) {
        this.value = {
            h: 0,
            s: 0,
            b: 0,
            a: 1
        };
        this.origFormat = null; // original string format
        if (val) {
            if (val.toLowerCase !== undefined) {
                this.setColor(val);
            } else if (val.h !== undefined) {
                this.value = val;
            }
        }
    };

    Color.prototype = {
        constructor: Color,
        _sanitizeNumber: function(val) {
            if (typeof val === 'number') {
                return val;
            }
            if (isNaN(val) || (val === null) || (val === '') || (val === undefined)) {
                return 1;
            }
            if (val.toLowerCase !== undefined) {
                return parseFloat(val);
            }
            return 1;
        },
        //parse a string to HSB
        setColor: function(strVal) {
            strVal = strVal.toLowerCase();
            this.value = this.stringToHSB(strVal) ||  {
                h: 0,
                s: 0,
                b: 0,
                a: 1
            };
        },
        stringToHSB: function(strVal) {
            strVal = strVal.toLowerCase();
            var that = this,
                result = false;
            $.each(this.stringParsers, function(i, parser) {
                var match = parser.re.exec(strVal),
                    values = match && parser.parse.apply(that, [match]),
                    format = parser.format || 'rgba';
                if (values) {
                    if (format.match(/hsla?/)) {
                        result = that.RGBtoHSB.apply(that, that.HSLtoRGB.apply(that, values));
                    } else {
                        result = that.RGBtoHSB.apply(that, values);
                    }
                    that.origFormat = format;
                    return false;
                }
                return true;
            });
            return result;
        },
        setHue: function(h) {
            this.value.h = 1 - h;
        },
        setSaturation: function(s) {
            this.value.s = s;
        },
        setBrightness: function(b) {
            this.value.b = 1 - b;
        },
        setAlpha: function(a) {
            this.value.a = parseInt((1 - a) * 100, 10) / 100;
        },
        toRGB: function(h, s, v, a) {
            h = h || this.value.h;
            s = s || this.value.s;
            v = v || this.value.b;
            a = a || this.value.a;

            var r, g, b, i, f, p, q, t;
            if (h && s === undefined && v === undefined) {
                s = h.s, v = h.v, h = h.h;
            }
            i = Math.floor(h * 6);
            f = h * 6 - i;
            p = v * (1 - s);
            q = v * (1 - f * s);
            t = v * (1 - (1 - f) * s);
            switch (i % 6) {
                case 0:
                    r = v, g = t, b = p;
                    break;
                case 1:
                    r = q, g = v, b = p;
                    break;
                case 2:
                    r = p, g = v, b = t;
                    break;
                case 3:
                    r = p, g = q, b = v;
                    break;
                case 4:
                    r = t, g = p, b = v;
                    break;
                case 5:
                    r = v, g = p, b = q;
                    break;
            }
            return {
                r: Math.floor(r * 255),
                g: Math.floor(g * 255),
                b: Math.floor(b * 255),
                a: a
            };
        },
        toHex: function(h, s, b, a) {
            var rgb = this.toRGB(h, s, b, a);
            return '#' + ((1 << 24) | (parseInt(rgb.r) << 16) | (parseInt(rgb.g) << 8) | parseInt(rgb.b)).toString(16).substr(1);
        },
        toHSL: function(h, s, b, a) {
            h = h || this.value.h;
            s = s || this.value.s;
            b = b || this.value.b;
            a = a || this.value.a;

            var H = h,
                L = (2 - s) * b,
                S = s * b;
            if (L > 0 && L <= 1) {
                S /= L;
            } else {
                S /= 2 - L;
            }
            L /= 2;
            if (S > 1) {
                S = 1;
            }
            return {
                h: H,
                s: S,
                l: L,
                a: a
            };
        },
        RGBtoHSB: function(r, g, b, a) {
            r /= 255;
            g /= 255;
            b /= 255;

            var H, S, V, C;
            V = Math.max(r, g, b);
            C = V - Math.min(r, g, b);
            H = (C === 0 ? null :
                V === r ? (g - b) / C :
                V === g ? (b - r) / C + 2 :
                (r - g) / C + 4
            );
            H = ((H + 360) % 6) * 60 / 360;
            S = C === 0 ? 0 : C / V;
            return {
                h: this._sanitizeNumber(H),
                s: S,
                b: V,
                a: this._sanitizeNumber(a)
            };
        },
        HueToRGB: function(p, q, h) {
            if (h < 0) {
                h += 1;
            } else if (h > 1) {
                h -= 1;
            }
            if ((h * 6) < 1) {
                return p + (q - p) * h * 6;
            } else if ((h * 2) < 1) {
                return q;
            } else if ((h * 3) < 2) {
                return p + (q - p) * ((2 / 3) - h) * 6;
            } else {
                return p;
            }
        },
        HSLtoRGB: function(h, s, l, a) {
            if (s < 0) {
                s = 0;
            }
            var q;
            if (l <= 0.5) {
                q = l * (1 + s);
            } else {
                q = l + s - (l * s);
            }

            var p = 2 * l - q;

            var tr = h + (1 / 3);
            var tg = h;
            var tb = h - (1 / 3);

            var r = Math.round(this.HueToRGB(p, q, tr) * 255);
            var g = Math.round(this.HueToRGB(p, q, tg) * 255);
            var b = Math.round(this.HueToRGB(p, q, tb) * 255);
            return [r, g, b, this._sanitizeNumber(a)];
        },
        toString: function(format) {
            format = format ||  'rgba';
            switch (format) {
                case 'rgb':
                    {
                        var rgb = this.toRGB();
                        return 'rgb(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ')';
                    }
                    break;
                case 'rgba':
                    {
                        var rgb = this.toRGB();
                        return 'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + rgb.a + ')';
                    }
                    break;
                case 'hsl':
                    {
                        var hsl = this.toHSL();
                        return 'hsl(' + Math.round(hsl.h * 360) + ',' + Math.round(hsl.s * 100) + '%,' + Math.round(hsl.l * 100) + '%)';
                    }
                    break;
                case 'hsla':
                    {
                        var hsl = this.toHSL();
                        return 'hsla(' + Math.round(hsl.h * 360) + ',' + Math.round(hsl.s * 100) + '%,' + Math.round(hsl.l * 100) + '%,' + hsl.a + ')';
                    }
                    break;
                case 'hex':
                    {
                        return this.toHex();
                    }
                    break;
                default:
                    {
                        return false;
                    }
                    break;
            }
        },
        // a set of RE's that can match strings and generate color tuples.
        // from John Resig color plugin
        // https://github.com/jquery/jquery-color/
        stringParsers: [{
            re: /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})/,
            format: 'hex',
            parse: function(execResult) {
                return [
                    parseInt(execResult[1], 16),
                    parseInt(execResult[2], 16),
                    parseInt(execResult[3], 16),
                    1
                ];
            }
        }, {
            re: /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])/,
            format: 'hex',
            parse: function(execResult) {
                return [
                    parseInt(execResult[1] + execResult[1], 16),
                    parseInt(execResult[2] + execResult[2], 16),
                    parseInt(execResult[3] + execResult[3], 16),
                    1
                ];
            }
        }, {
            re: /rgb\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*?\)/,
            format: 'rgb',
            parse: function(execResult) {
                return [
                    execResult[1],
                    execResult[2],
                    execResult[3],
                    1
                ];
            }
        }, {
            re: /rgb\(\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*?\)/,
            format: 'rgb',
            parse: function(execResult) {
                return [
                    2.55 * execResult[1],
                    2.55 * execResult[2],
                    2.55 * execResult[3],
                    1
                ];
            }
        }, {
            re: /rgba\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*(?:,\s*(\d+(?:\.\d+)?)\s*)?\)/,
            format: 'rgba',
            parse: function(execResult) {
                return [
                    execResult[1],
                    execResult[2],
                    execResult[3],
                    execResult[4]
                ];
            }
        }, {
            re: /rgba\(\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*(?:,\s*(\d+(?:\.\d+)?)\s*)?\)/,
            format: 'rgba',
            parse: function(execResult) {
                return [
                    2.55 * execResult[1],
                    2.55 * execResult[2],
                    2.55 * execResult[3],
                    execResult[4]
                ];
            }
        }, {
            re: /hsl\(\s*(\d+(?:\.\d+)?)\s*,\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*?\)/,
            format: 'hsl',
            parse: function(execResult) {
                return [
                    execResult[1] / 360,
                    execResult[2] / 100,
                    execResult[3] / 100,
                    execResult[4]
                ];
            }
        }, {
            re: /hsla\(\s*(\d+(?:\.\d+)?)\s*,\s*(\d+(?:\.\d+)?)\%\s*,\s*(\d+(?:\.\d+)?)\%\s*(?:,\s*(\d+(?:\.\d+)?)\s*)?\)/,
            format: 'hsla',
            parse: function(execResult) {
                return [
                    execResult[1] / 360,
                    execResult[2] / 100,
                    execResult[3] / 100,
                    execResult[4]
                ];
            }
        }, {
            //predefined color name
            re: /^([a-z]{3,})$/,
            format: 'alias',
            parse: function(execResult) {
                var hexval = this.colorNameToHex(execResult[0]) ||  '#000000';
                var match = this.stringParsers[0].re.exec(hexval),
                    values = match && this.stringParsers[0].parse.apply(this, [match]);
                return values;
            }
        }],
        colorNameToHex: function(name) {
            // 140 predefined colors from the HTML Colors spec
            var colors = {
                "aliceblue": "#f0f8ff",
                "antiquewhite": "#faebd7",
                "aqua": "#00ffff",
                "aquamarine": "#7fffd4",
                "azure": "#f0ffff",
                "beige": "#f5f5dc",
                "bisque": "#ffe4c4",
                "black": "#000000",
                "blanchedalmond": "#ffebcd",
                "blue": "#0000ff",
                "blueviolet": "#8a2be2",
                "brown": "#a52a2a",
                "burlywood": "#deb887",
                "cadetblue": "#5f9ea0",
                "chartreuse": "#7fff00",
                "chocolate": "#d2691e",
                "coral": "#ff7f50",
                "cornflowerblue": "#6495ed",
                "cornsilk": "#fff8dc",
                "crimson": "#dc143c",
                "cyan": "#00ffff",
                "darkblue": "#00008b",
                "darkcyan": "#008b8b",
                "darkgoldenrod": "#b8860b",
                "darkgray": "#a9a9a9",
                "darkgreen": "#006400",
                "darkkhaki": "#bdb76b",
                "darkmagenta": "#8b008b",
                "darkolivegreen": "#556b2f",
                "darkorange": "#ff8c00",
                "darkorchid": "#9932cc",
                "darkred": "#8b0000",
                "darksalmon": "#e9967a",
                "darkseagreen": "#8fbc8f",
                "darkslateblue": "#483d8b",
                "darkslategray": "#2f4f4f",
                "darkturquoise": "#00ced1",
                "darkviolet": "#9400d3",
                "deeppink": "#ff1493",
                "deepskyblue": "#00bfff",
                "dimgray": "#696969",
                "dodgerblue": "#1e90ff",
                "firebrick": "#b22222",
                "floralwhite": "#fffaf0",
                "forestgreen": "#228b22",
                "fuchsia": "#ff00ff",
                "gainsboro": "#dcdcdc",
                "ghostwhite": "#f8f8ff",
                "gold": "#ffd700",
                "goldenrod": "#daa520",
                "gray": "#808080",
                "green": "#008000",
                "greenyellow": "#adff2f",
                "honeydew": "#f0fff0",
                "hotpink": "#ff69b4",
                "indianred ": "#cd5c5c",
                "indigo ": "#4b0082",
                "ivory": "#fffff0",
                "khaki": "#f0e68c",
                "lavender": "#e6e6fa",
                "lavenderblush": "#fff0f5",
                "lawngreen": "#7cfc00",
                "lemonchiffon": "#fffacd",
                "lightblue": "#add8e6",
                "lightcoral": "#f08080",
                "lightcyan": "#e0ffff",
                "lightgoldenrodyellow": "#fafad2",
                "lightgrey": "#d3d3d3",
                "lightgreen": "#90ee90",
                "lightpink": "#ffb6c1",
                "lightsalmon": "#ffa07a",
                "lightseagreen": "#20b2aa",
                "lightskyblue": "#87cefa",
                "lightslategray": "#778899",
                "lightsteelblue": "#b0c4de",
                "lightyellow": "#ffffe0",
                "lime": "#00ff00",
                "limegreen": "#32cd32",
                "linen": "#faf0e6",
                "magenta": "#ff00ff",
                "maroon": "#800000",
                "mediumaquamarine": "#66cdaa",
                "mediumblue": "#0000cd",
                "mediumorchid": "#ba55d3",
                "mediumpurple": "#9370d8",
                "mediumseagreen": "#3cb371",
                "mediumslateblue": "#7b68ee",
                "mediumspringgreen": "#00fa9a",
                "mediumturquoise": "#48d1cc",
                "mediumvioletred": "#c71585",
                "midnightblue": "#191970",
                "mintcream": "#f5fffa",
                "mistyrose": "#ffe4e1",
                "moccasin": "#ffe4b5",
                "navajowhite": "#ffdead",
                "navy": "#000080",
                "oldlace": "#fdf5e6",
                "olive": "#808000",
                "olivedrab": "#6b8e23",
                "orange": "#ffa500",
                "orangered": "#ff4500",
                "orchid": "#da70d6",
                "palegoldenrod": "#eee8aa",
                "palegreen": "#98fb98",
                "paleturquoise": "#afeeee",
                "palevioletred": "#d87093",
                "papayawhip": "#ffefd5",
                "peachpuff": "#ffdab9",
                "peru": "#cd853f",
                "pink": "#ffc0cb",
                "plum": "#dda0dd",
                "powderblue": "#b0e0e6",
                "purple": "#800080",
                "red": "#ff0000",
                "rosybrown": "#bc8f8f",
                "royalblue": "#4169e1",
                "saddlebrown": "#8b4513",
                "salmon": "#fa8072",
                "sandybrown": "#f4a460",
                "seagreen": "#2e8b57",
                "seashell": "#fff5ee",
                "sienna": "#a0522d",
                "silver": "#c0c0c0",
                "skyblue": "#87ceeb",
                "slateblue": "#6a5acd",
                "slategray": "#708090",
                "snow": "#fffafa",
                "springgreen": "#00ff7f",
                "steelblue": "#4682b4",
                "tan": "#d2b48c",
                "teal": "#008080",
                "thistle": "#d8bfd8",
                "tomato": "#ff6347",
                "turquoise": "#40e0d0",
                "violet": "#ee82ee",
                "wheat": "#f5deb3",
                "white": "#ffffff",
                "whitesmoke": "#f5f5f5",
                "yellow": "#ffff00",
                "yellowgreen": "#9acd32"
            };

            if (typeof colors[name.toLowerCase()] !== 'undefined') {
                return colors[name.toLowerCase()];
            }
            return false;
        }
    };


    var defaults = {
        horizontal: false, // horizontal mode layout ?
        inline: false, //forces to show the colorpicker as an inline element
        color: false, //forces a color
        format: false, //forces a format
        input: 'input', // children input selector
        container: false, // container selector
        component: '.add-on, .input-group-addon', // children component selector
        sliders: {
            saturation: {
                maxLeft: 100,
                maxTop: 100,
                callLeft: 'setSaturation',
                callTop: 'setBrightness'
            },
            hue: {
                maxLeft: 0,
                maxTop: 100,
                callLeft: false,
                callTop: 'setHue'
            },
            alpha: {
                maxLeft: 0,
                maxTop: 100,
                callLeft: false,
                callTop: 'setAlpha'
            }
        },
        slidersHorz: {
            saturation: {
                maxLeft: 100,
                maxTop: 100,
                callLeft: 'setSaturation',
                callTop: 'setBrightness'
            },
            hue: {
                maxLeft: 100,
                maxTop: 0,
                callLeft: 'setHue',
                callTop: false
            },
            alpha: {
                maxLeft: 100,
                maxTop: 0,
                callLeft: 'setAlpha',
                callTop: false
            }
        },
        template: '<div class="colorpicker dropdown-menu">' +
            '<div class="colorpicker-saturation"><i><b></b></i></div>' +
            '<div class="colorpicker-hue"><i></i></div>' +
            '<div class="colorpicker-alpha"><i></i></div>' +
            '<div class="colorpicker-color"><div /></div>' +
            '</div>'
    };

    var Colorpicker = function(element, options) {
        this.element = $(element).addClass('colorpicker-element');
        this.options = $.extend({}, defaults, this.element.data(), options);
        this.component = this.options.component;
        this.component = (this.component !== false) ? this.element.find(this.component) : false;
        if (this.component && (this.component.length === 0)) {
            this.component = false;
        }
        this.container = (this.options.container === true) ? this.element : this.options.container;
        this.container = (this.container !== false) ? $(this.container) : false;

        // Is the element an input? Should we search inside for any input?
        this.input = this.element.is('input') ? this.element : (this.options.input ?
            this.element.find(this.options.input) : false);
        if (this.input && (this.input.length === 0)) {
            this.input = false;
        }
        // Set HSB color
        this.color = new Color(this.options.color !== false ? this.options.color : this.getValue());
        this.format = this.options.format !== false ? this.options.format : this.color.origFormat;

        // Setup picker
        this.picker = $(this.options.template);
        if (this.options.inline) {
            this.picker.addClass('colorpicker-inline colorpicker-visible');
        } else {
            this.picker.addClass('colorpicker-hidden');
        }
        if (this.options.horizontal) {
            this.picker.addClass('colorpicker-horizontal');
        }
        if (this.format === 'rgba' || this.format === 'hsla') {
            this.picker.addClass('colorpicker-with-alpha');
        }
        this.picker.on('mousedown.colorpicker', $.proxy(this.mousedown, this));
        this.picker.appendTo(this.container ? this.container : $('body'));

        // Bind events
        if (this.input !== false) {
            this.input.on({
                'keyup.colorpicker': $.proxy(this.keyup, this)
            });
            if (this.component === false) {
                this.element.on({
                    'focus.colorpicker': $.proxy(this.show, this)
                });
            }
            if (this.options.inline === false) {
                this.element.on({
                    'focusout.colorpicker': $.proxy(this.hide, this)
                });
            }
        }

        if (this.component !== false) {
            this.component.on({
                'click.colorpicker': $.proxy(this.show, this)
            });
        }

        if ((this.input === false) && (this.component === false)) {
            this.element.on({
                'click.colorpicker': $.proxy(this.show, this)
            });
        }
        this.update();

        $($.proxy(function() {
            this.element.trigger('create');
        }, this));
    };

    Colorpicker.version = '2.0.0-beta';

    Colorpicker.Color = Color;

    Colorpicker.prototype = {
        constructor: Colorpicker,
        destroy: function() {
            this.picker.remove();
            this.element.removeData('colorpicker').off('.colorpicker');
            if (this.input !== false) {
                this.input.off('.colorpicker');
            }
            if (this.component !== false) {
                this.component.off('.colorpicker');
            }
            this.element.removeClass('colorpicker-element');
            this.element.trigger({
                type: 'destroy'
            });
        },
        reposition: function() {
            if (this.options.inline !== false) {
                return false;
            }
            var offset = this.component ? this.component.offset() : this.element.offset();
            this.picker.css({
                top: offset.top + (this.component ? this.component.outerHeight() : this.element.outerHeight()),
                left: offset.left
            });
        },
        show: function(e) {
            if (this.isDisabled()) {
                return false;
            }
            this.picker.addClass('colorpicker-visible').removeClass('colorpicker-hidden');
            this.reposition();
            $(window).on('resize.colorpicker', $.proxy(this.reposition, this));
            if (!this.hasInput() && e) {
                if (e.stopPropagation && e.preventDefault) {
                    e.stopPropagation();
                    e.preventDefault();
                }
            }
            if (this.options.inline === false) {
                $(window.document).on({
                    'mousedown.colorpicker': $.proxy(this.hide, this)
                });
            }
            this.element.trigger({
                type: 'showPicker',
                color: this.color
            });
        },
        hide: function() {
            this.picker.addClass('colorpicker-hidden').removeClass('colorpicker-visible');
            $(window).off('resize.colorpicker', this.reposition);
            $(document).off({
                'mousedown.colorpicker': this.hide
            });
            this.update();
            this.element.trigger({
                type: 'hidePicker',
                color: this.color
            });
        },
        updateData: function(val) {
            val = val ||  this.color.toString(this.format);
            this.element.data('color', val);
            return val;
        },
        updateInput: function(val) {
            val = val ||  this.color.toString(this.format);
            if (this.input !== false) {
                this.input.prop('value', val);
            }
            return val;
        },
        updatePicker: function(val) {
            if (val !== undefined) {
                this.color = new Color(val);
            }
            var sl = (this.options.horizontal === false) ? this.options.sliders : this.options.slidersHorz;
            var icns = this.picker.find('i');
            if (icns.length === 0) {
                return;
            }
            if (this.options.horizontal === false) {
                sl = this.options.sliders;
                icns.eq(1).css('top', sl.hue.maxTop * (1 - this.color.value.h)).end()
                    .eq(2).css('top', sl.alpha.maxTop * (1 - this.color.value.a));
            } else {
                sl = this.options.slidersHorz;
                icns.eq(1).css('left', sl.hue.maxLeft * (1 - this.color.value.h)).end()
                    .eq(2).css('left', sl.alpha.maxLeft * (1 - this.color.value.a));
            }
            icns.eq(0).css({
                'top': sl.saturation.maxTop - this.color.value.b * sl.saturation.maxTop,
                'left': this.color.value.s * sl.saturation.maxLeft
            });
            this.picker.find('.colorpicker-saturation').css('backgroundColor', this.color.toHex(this.color.value.h, 1, 1, 1));
            this.picker.find('.colorpicker-alpha').css('backgroundColor', this.color.toHex());
            this.picker.find('.colorpicker-color, .colorpicker-color div').css('backgroundColor', this.color.toString(this.format));
            return val;
        },
        updateComponent: function(val) {
            val = val ||  this.color.toString(this.format);
            if (this.component !== false) {
                var icn = this.component.find('i').eq(0);
                if (icn.length > 0) {
                    icn.css({
                        'backgroundColor': val
                    });
                } else {
                    this.component.css({
                        'backgroundColor': val
                    });
                }
            }
            return val;
        },
        update: function(force) {
            var val = this.updateComponent();
            if ((this.getValue(false) !== false) || (force === true)) {
                // Update input/data only if the current value is not blank
                this.updateInput(val);
                this.updateData(val);
            }
            this.updatePicker();
            return val;

        },
        setValue: function(val) { // set color manually
            this.color = new Color(val);
            this.update();
            this.element.trigger({
                type: 'changeColor',
                color: this.color,
                value: val
            });
        },
        getValue: function(defaultValue) {
            defaultValue = (defaultValue === undefined) ? '#000000' : defaultValue;
            var val;
            if (this.hasInput()) {
                val = this.input.val();
            } else {
                val = this.element.data('color');
            }
            if ((val === undefined) || (val === '') || (val === null)) {
                // if not defined or empty, return default
                val = defaultValue;
            }
            return val;
        },
        hasInput: function() {
            return (this.input !== false);
        },
        isDisabled: function() {
            if (this.hasInput()) {
                return (this.input.prop('disabled') === true);
            }
            return false;
        },
        disable: function() {
            if (this.hasInput()) {
                this.input.prop('disabled', true);
                return true;
            }
            return false;
        },
        enable: function() {
            if (this.hasInput()) {
                this.input.prop('disabled', false);
                return true;
            }
            return false;
        },
        currentSlider: null,
        mousePointer: {
            left: 0,
            top: 0
        },
        mousedown: function(e) {
            e.stopPropagation();
            e.preventDefault();

            var target = $(e.target);

            //detect the slider and set the limits and callbacks
            var zone = target.closest('div');
            var sl = this.options.horizontal ? this.options.slidersHorz : this.options.sliders;
            if (!zone.is('.colorpicker')) {
                if (zone.is('.colorpicker-saturation')) {
                    this.currentSlider = $.extend({}, sl.saturation);
                } else if (zone.is('.colorpicker-hue')) {
                    this.currentSlider = $.extend({}, sl.hue);
                } else if (zone.is('.colorpicker-alpha')) {
                    this.currentSlider = $.extend({}, sl.alpha);
                } else {
                    return false;
                }
                var offset = zone.offset();
                //reference to guide's style
                this.currentSlider.guide = zone.find('i')[0].style;
                this.currentSlider.left = e.pageX - offset.left;
                this.currentSlider.top = e.pageY - offset.top;
                this.mousePointer = {
                    left: e.pageX,
                    top: e.pageY
                };
                //trigger mousemove to move the guide to the current position
                $(document).on({
                    'mousemove.colorpicker': $.proxy(this.mousemove, this),
                    'mouseup.colorpicker': $.proxy(this.mouseup, this)
                }).trigger('mousemove');
            }
            return false;
        },
        mousemove: function(e) {
            e.stopPropagation();
            e.preventDefault();
            var left = Math.max(
                0,
                Math.min(
                    this.currentSlider.maxLeft,
                    this.currentSlider.left + ((e.pageX || this.mousePointer.left) - this.mousePointer.left)
                )
            );
            var top = Math.max(
                0,
                Math.min(
                    this.currentSlider.maxTop,
                    this.currentSlider.top + ((e.pageY || this.mousePointer.top) - this.mousePointer.top)
                )
            );
            this.currentSlider.guide.left = left + 'px';
            this.currentSlider.guide.top = top + 'px';
            if (this.currentSlider.callLeft) {
                this.color[this.currentSlider.callLeft].call(this.color, left / 100);
            }
            if (this.currentSlider.callTop) {
                this.color[this.currentSlider.callTop].call(this.color, top / 100);
            }
            this.update(true);

            this.element.trigger({
                type: 'changeColor',
                color: this.color
            });
            return false;
        },
        mouseup: function(e) {
            e.stopPropagation();
            e.preventDefault();
            $(document).off({
                'mousemove.colorpicker': this.mousemove,
                'mouseup.colorpicker': this.mouseup
            });
            return false;
        },
        keyup: function(e) {
            if ((e.keyCode === 38)) {
                if (this.color.value.a < 1) {
                    this.color.value.a = Math.round((this.color.value.a + 0.01) * 100) / 100;
                }
                this.update(true);
            } else if ((e.keyCode === 40)) {
                if (this.color.value.a > 0) {
                    this.color.value.a = Math.round((this.color.value.a - 0.01) * 100) / 100;
                }
                this.update(true);
            } else {
                var val = this.input.val();
                this.color = new Color(val);
                if (this.getValue(false) !== false) {
                    this.updateData();
                    this.updateComponent();
                    this.updatePicker();
                }
            }
            this.element.trigger({
                type: 'changeColor',
                color: this.color,
                value: val
            });
        }
    };

    $.colorpicker = Colorpicker;

    $.fn.colorpicker = function(option) {
        return this.each(function() {
            var $this = $(this),
                inst = $this.data('colorpicker'),
                options = ((typeof option === 'object') ? option : {});
            if ((!inst) && (typeof option !== 'string')) {
                $this.data('colorpicker', new Colorpicker(this, options));
            } else {
                if (typeof option === 'string') {
                    inst[option].apply(inst, Array.prototype.slice.call(arguments, 1));
                }
            }
        });
    };

    $.fn.colorpicker.constructor = Colorpicker;

})(window.jQuery);