Subversion Repositories SmartDukaan

/*!jQuery Knob*/

/**

 * Downward compatible, touchable dial

 *

 * Version: 1.2.0 (15/07/2012)

 * Requires: jQuery v1.7+

 *

 * Copyright (c) 2012 Anthony Terrien

 * Under MIT and GPL licenses:

 *  http://www.opensource.org/licenses/mit-license.php

 *  http://www.gnu.org/licenses/gpl.html

 *

 * Thanks to vor, eskimoblood, spiffistan, FabrizioC

 */

(function($) {

    /**

     * Kontrol library

     */

    "use strict";

    /**

     * Definition of globals and core

     */

    var k = {}, // kontrol

        max = Math.max,

        min = Math.min;

    k.c = {};

    k.c.d = $(document);

    k.c.t = function (e) {

        return e.originalEvent.touches.length - 1;

    };

    /**

     * Kontrol Object

     *

     * Definition of an abstract UI control

     *

     * Each concrete component must call this one.

     * <code>

     * k.o.call(this);

     * </code>

     */

    k.o = function () {

        var s = this;

        this.o = null; // array of options

        this.$ = null; // jQuery wrapped element

        this.i = null; // mixed HTMLInputElement or array of HTMLInputElement

        this.g = null; // 2D graphics context for 'pre-rendering'

        this.v = null; // value ; mixed array or integer

        this.cv = null; // change value ; not commited value

        this.x = 0; // canvas x position

        this.y = 0; // canvas y position

        this.$c = null; // jQuery canvas element

        this.c = null; // rendered canvas context

        this.t = 0; // touches index

        this.isInit = false;

        this.fgColor = null; // main color

        this.pColor = null; // previous color

        this.dH = null; // draw hook

        this.cH = null; // change hook

        this.eH = null; // cancel hook

        this.rH = null; // release hook

        this.run = function () {

            var cf = function (e, conf) {

                var k;

                for (k in conf) {

                    s.o[k] = conf[k];

                }

                s.init();

                s._configure()

                 ._draw();

            };

            if(this.$.data('kontroled')) return;

            this.$.data('kontroled', true);

            this.extend();

            this.o = $.extend(

                {

                    // Config

                    min : this.$.data('min') || 0,

                    max : this.$.data('max') || 100,

                    stopper : true,

                    readOnly : this.$.data('readonly'),

                    // UI

                    cursor : (this.$.data('cursor') === true && 30)

                                || this.$.data('cursor')

                                || 0,

                    thickness : this.$.data('thickness') || 0.35,

                    width : this.$.data('width') || 200,

                    height : this.$.data('height') || 200,

                    displayInput : this.$.data('displayinput') == null || this.$.data('displayinput'),

                    displayPrevious : this.$.data('displayprevious'),

                    fgColor : this.$.data('fgcolor') || '#87CEEB',

                    inline : false,

                    // Hooks

                    draw : null, // function () {}

                    change : null, // function (value) {}

                    cancel : null, // function () {}

                    release : null // function (value) {}

                }, this.o

            );

            // routing value

            if(this.$.is('fieldset')) {

                // fieldset = array of integer

                this.v = {};

                this.i = this.$.find('input')

                this.i.each(function(k) {

                    var $this = $(this);

                    s.i[k] = $this;

                    s.v[k] = $this.val();

                    $this.bind(

                        'change'

                        , function () {

                            var val = {};

                            val[k] = $this.val();

                            s.val(val);

                        }

                    );

                });

                this.$.find('legend').remove();

            } else {

                // input = integer

                this.i = this.$;

                this.v = this.$.val();

                (this.v == '') && (this.v = this.o.min);

                this.$.bind(

                    'change'

                    , function () {

                        s.val(s.$.val());

                    }

                );

            }

            (!this.o.displayInput) && this.$.hide();

            this.$c = $('<canvas width="' +

                            this.o.width + 'px" height="' +

                            this.o.height + 'px"></canvas>');

            this.c = this.$c[0].getContext("2d");

            this.$

                .wrap($('<div style="' + (this.o.inline ? 'display:inline;' : '') +

                        'width:' + this.o.width + 'px;height:' +

                        this.o.height + 'px;"></div>'))

                .before(this.$c);

            if (this.v instanceof Object) {

                this.cv = {};

                this.copy(this.v, this.cv);

            } else {

                this.cv = this.v;

            }

            this.$

                .bind("configure", cf)

                .parent()

                .bind("configure", cf);

            this._listen()

                ._configure()

                ._xy()

                .init();

            this.isInit = true;

            this._draw();

            return this;

        };

        this._draw = function () {

            // canvas pre-rendering

            var d = true,

                c = document.createElement('canvas');

            c.width = s.o.width;

            c.height = s.o.height;

            s.g = c.getContext('2d');

            s.clear();

            s.dH

            && (d = s.dH());

            (d !== false) && s.draw();

            s.c.drawImage(c, 0, 0);

            c = null;

        };

        this._touch = function (e) {

            var touchMove = function (e) {

                var v = s.xy2val(

                            e.originalEvent.touches[s.t].pageX,

                            e.originalEvent.touches[s.t].pageY

                            );

                if (v == s.cv) return;

                if (

                    s.cH

                    && (s.cH(v) === false)

                ) return;

                s.change(v);

                s._draw();

            };

            // get touches index

            this.t = k.c.t(e);

            // First touch

            touchMove(e);

            // Touch events listeners

            k.c.d

                .bind("touchmove.k", touchMove)

                .bind(

                    "touchend.k"

                    , function () {

                        k.c.d.unbind('touchmove.k touchend.k');

                        if (

                            s.rH

                            && (s.rH(s.cv) === false)

                        ) return;

                        s.val(s.cv);

                    }

                );

            return this;

        };

        this._mouse = function (e) {

            var mouseMove = function (e) {

                var v = s.xy2val(e.pageX, e.pageY);

                if (v == s.cv) return;

                if (

                    s.cH

                    && (s.cH(v) === false)

                ) return;

                s.change(v);

                s._draw();

            };

            // First click

            mouseMove(e);

            // Mouse events listeners

            k.c.d

                .bind("mousemove.k", mouseMove)

                .bind(

                    // Escape key cancel current change

                    "keyup.k"

                    , function (e) {

                        if (e.keyCode === 27) {

                            k.c.d.unbind("mouseup.k mousemove.k keyup.k");

                            if (

                                s.eH

                                && (s.eH() === false)

                            ) return;

                            s.cancel();

                        }

                    }

                )

                .bind(

                    "mouseup.k"

                    , function (e) {

                        k.c.d.unbind('mousemove.k mouseup.k keyup.k');

                        if (

                            s.rH

                            && (s.rH(s.cv) === false)

                        ) return;

                        s.val(s.cv);

                    }

                );

            return this;

        };

        this._xy = function () {

            var o = this.$c.offset();

            this.x = o.left;

            this.y = o.top;

            return this;

        };

        this._listen = function () {

            if (!this.o.readOnly) {

                this.$c

                    .bind(

                        "mousedown"

                        , function (e) {

                            e.preventDefault();

                            s._xy()._mouse(e);

                         }

                    )

                    .bind(

                        "touchstart"

                        , function (e) {

                            e.preventDefault();

                            s._xy()._touch(e);

                         }

                    );

                this.listen();

            } else {

                this.$.attr('readonly', 'readonly');

            }

            return this;

        };

        this._configure = function () {

            // Hooks

            if (this.o.draw) this.dH = this.o.draw;

            if (this.o.change) this.cH = this.o.change;

            if (this.o.cancel) this.eH = this.o.cancel;

            if (this.o.release) this.rH = this.o.release;

            if (this.o.displayPrevious) {

                this.pColor = this.h2rgba(this.o.fgColor, "0.4");

                this.fgColor = this.h2rgba(this.o.fgColor, "0.6");

            } else {

                this.fgColor = this.o.fgColor;

            }

            return this;

        };

        this._clear = function () {

            this.$c[0].width = this.$c[0].width;

        };

        // Abstract methods

        this.listen = function () {}; // on start, one time

        this.extend = function () {}; // each time configure triggered

        this.init = function () {}; // each time configure triggered

        this.change = function (v) {}; // on change

        this.val = function (v) {}; // on release

        this.xy2val = function (x, y) {}; //

        this.draw = function () {}; // on change / on release

        this.clear = function () { this._clear(); };

        // Utils

        this.h2rgba = function (h, a) {

            var rgb;

            h = h.substring(1,7)

            rgb = [parseInt(h.substring(0,2),16)

                   ,parseInt(h.substring(2,4),16)

                   ,parseInt(h.substring(4,6),16)];

            return "rgba(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "," + a + ")";

        };

        this.copy = function (f, t) {

            for (var i in f) { t[i] = f[i]; }

        };

    };

    /**

     * k.Dial

     */

    k.Dial = function () {

        k.o.call(this);

        this.startAngle = null;

        this.xy = null;

        this.radius = null;

        this.lineWidth = null;

        this.cursorExt = null;

        this.w2 = null;

        this.PI2 = 2*Math.PI;

        this.extend = function () {

            this.o = $.extend(

                {

                    bgColor : this.$.data('bgcolor') || '#EEEEEE',

                    angleOffset : this.$.data('angleoffset') || 0,

                    angleArc : this.$.data('anglearc') || 360,

                    inline : true

                }, this.o

            );

        };

        this.val = function (v) {

            if (null != v) {

                this.cv = this.o.stopper ? max(min(v, this.o.max), this.o.min) : v;

                this.v = this.cv;

                this.$.val(this.v);

                this._draw();

            } else {

                return this.v;

            }

        };

        this.xy2val = function (x, y) {

            var a, ret;

            a = Math.atan2(

                        x - (this.x + this.w2)

                        , - (y - this.y - this.w2)

                    ) - this.angleOffset;

            if(this.angleArc != this.PI2 && (a < 0) && (a > -0.5)) {

                // if isset angleArc option, set to min if .5 under min

                a = 0;

            } else if (a < 0) {

                a += this.PI2;

            }

            ret = ~~ (0.5 + (a * (this.o.max - this.o.min) / this.angleArc))

                    + this.o.min;

            this.o.stopper

            && (ret = max(min(ret, this.o.max), this.o.min));

            return ret;

        };

        this.listen = function () {

            // bind MouseWheel

            var s = this,

                mw = function (e) {

                            e.preventDefault();

                            var ori = e.originalEvent

                                ,deltaX = ori.detail || ori.wheelDeltaX

                                ,deltaY = ori.detail || ori.wheelDeltaY

                                ,v = parseInt(s.$.val()) + (deltaX>0 || deltaY>0 ? 1 : deltaX<0 || deltaY<0 ? -1 : 0);

                            if (

                                s.cH

                                && (s.cH(v) === false)

                            ) return;

                            s.val(v);

                        }

                , kval, to, m = 1, kv = {37:-1, 38:1, 39:1, 40:-1};

            this.$

                .bind(

                    "keydown"

                    ,function (e) {

                        var kc = e.keyCode;

                        // numpad support

                        if(kc >= 96 && kc <= 105) {

                            kc = e.keyCode = kc - 48;

                        }

                        kval = parseInt(String.fromCharCode(kc));

                        if (isNaN(kval)) {

                            (kc !== 13)         // enter

                            && (kc !== 8)       // bs

                            && (kc !== 9)       // tab

                            && (kc !== 189)     // -

                            && e.preventDefault();

                            // arrows

                            if ($.inArray(kc,[37,38,39,40]) > -1) {

                                e.preventDefault();

                                var v = parseInt(s.$.val()) + kv[kc] * m;

                                s.o.stopper

                                && (v = max(min(v, s.o.max), s.o.min));

                                s.change(v);

                                s._draw();

                                // long time keydown speed-up

                                to = window.setTimeout(

                                    function () { m*=2; }

                                    ,30

                                );

                            }

                        }

                    }

                )

                .bind(

                    "keyup"

                    ,function (e) {

                        if (isNaN(kval)) {

                            if (to) {

                                window.clearTimeout(to);

                                to = null;

                                m = 1;

                                s.val(s.$.val());

                            }

                        } else {

                            // kval postcond

                            (s.$.val() > s.o.max && s.$.val(s.o.max))

                            || (s.$.val() < s.o.min && s.$.val(s.o.min));

                        }

                    }

                );

            this.$c.bind("mousewheel DOMMouseScroll", mw);

            this.$.bind("mousewheel DOMMouseScroll", mw)

        };

        this.init = function () {

            if (

                this.v < this.o.min

                || this.v > this.o.max

            ) this.v = this.o.min;

            this.$.val(this.v);

            this.w2 = this.o.width / 2;

            this.cursorExt = this.o.cursor / 100;

            this.xy = this.w2;

            this.lineWidth = this.xy * this.o.thickness;

            this.radius = this.xy - this.lineWidth / 2;

            this.o.angleOffset

            && (this.o.angleOffset = isNaN(this.o.angleOffset) ? 0 : this.o.angleOffset);

            this.o.angleArc

            && (this.o.angleArc = isNaN(this.o.angleArc) ? this.PI2 : this.o.angleArc);

            // deg to rad

            this.angleOffset = this.o.angleOffset * Math.PI / 180;

            this.angleArc = this.o.angleArc * Math.PI / 180;

            // compute start and end angles

            this.startAngle = 1.5 * Math.PI + this.angleOffset;

            this.endAngle = 1.5 * Math.PI + this.angleOffset + this.angleArc;

            var s = max(

                            String(Math.abs(this.o.max)).length

                            , String(Math.abs(this.o.min)).length

                            , 2

                            ) + 2;

            this.o.displayInput

                && this.i.css({

                        'width' : ((this.o.width / 2 + 4) >> 0) + 'px'

                        ,'height' : ((this.o.width / 3) >> 0) + 'px'

                        ,'position' : 'absolute'

                        ,'vertical-align' : 'middle'

                        ,'margin-top' : ((this.o.width / 3) >> 0) + 'px'

                        ,'margin-left' : '-' + ((this.o.width * 3 / 4 + 2) >> 0) + 'px'

                        ,'border' : 0

                        ,'background' : 'none'

                        ,'font' : 'bold ' + ((this.o.width / s) >> 0) + 'px Arial'

                        ,'text-align' : 'center'

                        ,'color' : this.o.fgColor

                        ,'padding' : '0px'

                        ,'-webkit-appearance': 'none'

                        })

                || this.i.css({

                        'width' : '0px'

                        ,'visibility' : 'hidden'

                        });

        };

        this.change = function (v) {

            this.cv = v;

            this.$.val(v);

        };

        this.angle = function (v) {

            return (v - this.o.min) * this.angleArc / (this.o.max - this.o.min);

        };

        this.draw = function () {

            var c = this.g,                 // context

                a = this.angle(this.cv)    // Angle

                , sat = this.startAngle     // Start angle

                , eat = sat + a             // End angle

                , sa, ea                    // Previous angles

                , r = 1;

            c.lineWidth = this.lineWidth;

            this.o.cursor

                && (sat = eat - this.cursorExt)

                && (eat = eat + this.cursorExt);

            c.beginPath();

                c.strokeStyle = this.o.bgColor;

                c.arc(this.xy, this.xy, this.radius, this.endAngle, this.startAngle, true);

            c.stroke();

            if (this.o.displayPrevious) {

                ea = this.startAngle + this.angle(this.v);

                sa = this.startAngle;

                this.o.cursor

                    && (sa = ea - this.cursorExt)

                    && (ea = ea + this.cursorExt);

                c.beginPath();

                    c.strokeStyle = this.pColor;

                    c.arc(this.xy, this.xy, this.radius, sa, ea, false);

                c.stroke();

                r = (this.cv == this.v);

            }

            c.beginPath();

                c.strokeStyle = r ? this.o.fgColor : this.fgColor ;

                c.arc(this.xy, this.xy, this.radius, sat, eat, false);

            c.stroke();

        };

        this.cancel = function () {

            this.val(this.v);

        };

    };

    $.fn.dial = $.fn.knob = function (o) {

        return this.each(

            function () {

                var d = new k.Dial();

                d.o = o;

                d.$ = $(this);

                d.run();

            }

        ).parent();

    };

})(jQuery);