The source code

    /**
     * @class Ext.slider.Thumb
     * @extends Object
     * Represents a single thumb element on a Slider. This would not usually be created manually and would instead
     * be created internally by an {@link Ext.slider.MultiSlider Ext.Slider}.
     */
    Ext.slider.Thumb = Ext.extend(Object, {

        /**
         * True while the thumb is in a drag operation
         * @type Boolean
         */
        dragging: false,

        /**
         * @constructor
         * @cfg {Ext.slider.MultiSlider} slider The Slider to render to (required)
         */
        constructor: function(config) {
            /**
             * @property slider
             * @type Ext.slider.MultiSlider
             * The slider this thumb is contained within
             */
            Ext.apply(this, config || {}, {
                cls: 'x-slider-thumb',

                /**
                 * @cfg {Boolean} constrain True to constrain the thumb so that it cannot overlap its siblings
                 */
                constrain: false
            });

            Ext.slider.Thumb.superclass.constructor.call(this, config);

            if (this.slider.vertical) {
                Ext.apply(this, Ext.slider.Thumb.Vertical);
            }
        },

        /**
         * Renders the thumb into a slider
         */
        render: function() {
            this.el = this.slider.innerEl.insertFirst({cls: this.cls});

            this.initEvents();
        },

        /**
         * Enables the thumb if it is currently disabled
         */
        enable: function() {
            this.disabled = false;
            this.el.removeClass(this.slider.disabledClass);
        },

        /**
         * Disables the thumb if it is currently enabled
         */
        disable: function() {
            this.disabled = true;
            this.el.addClass(this.slider.disabledClass);
        },

        /**
         * Sets up an Ext.dd.DragTracker for this thumb
         */
        initEvents: function() {
            var el = this.el;

            el.addClassOnOver('x-slider-thumb-over');

            this.tracker = new Ext.dd.DragTracker({
                onBeforeStart: this.onBeforeDragStart.createDelegate(this),
                onStart      : this.onDragStart.createDelegate(this),
                onDrag       : this.onDrag.createDelegate(this),
                onEnd        : this.onDragEnd.createDelegate(this),
                tolerance    : 3,
                autoStart    : 300
            });

            this.tracker.initEl(el);
        },

        /**
         * @private
         * This is tied into the internal Ext.dd.DragTracker. If the slider is currently disabled,
         * this returns false to disable the DragTracker too.
         * @return {Boolean} False if the slider is currently disabled
         */
        onBeforeDragStart : function(e) {
            if (this.disabled) {
                return false;
            } else {
                this.slider.promoteThumb(this);
                return true;
            }
        },

        /**
         * @private
         * This is tied into the internal Ext.dd.DragTracker's onStart template method. Adds the drag CSS class
         * to the thumb and fires the 'dragstart' event
         */
        onDragStart: function(e){
            this.el.addClass('x-slider-thumb-drag');
            this.dragging = true;
            this.dragStartValue = this.value;

            this.slider.fireEvent('dragstart', this.slider, e, this);
        },

        /**
         * @private
         * This is tied into the internal Ext.dd.DragTracker's onDrag template method. This is called every time
         * the DragTracker detects a drag movement. It updates the Slider's value using the position of the drag
         */
        onDrag: function(e) {
            var slider   = this.slider,
                index    = this.index,
                newValue = this.getNewValue();

            if (this.constrain) {
                var above = slider.thumbs[index + 1],
                    below = slider.thumbs[index - 1];

                if (below != undefined && newValue <= below.value) newValue = below.value;
                if (above != undefined && newValue >= above.value) newValue = above.value;
            }

            slider.setValue(index, newValue, false);
            slider.fireEvent('drag', slider, e, this);
        },

        getNewValue: function() {
            var slider   = this.slider,
                pos      = slider.innerEl.translatePoints(this.tracker.getXY());

            return Ext.util.Format.round(slider.reverseValue(pos.left), slider.decimalPrecision);
        },

        /**
         * @private
         * This is tied to the internal Ext.dd.DragTracker's onEnd template method. Removes the drag CSS class and
         * fires the 'changecomplete' event with the new value
         */
        onDragEnd: function(e) {
            var slider = this.slider,
                value  = this.value;

            this.el.removeClass('x-slider-thumb-drag');

            this.dragging = false;
            slider.fireEvent('dragend', slider, e);

            if (this.dragStartValue != value) {
                slider.fireEvent('changecomplete', slider, value, this);
            }
        },

        /**
         * @private
         * Destroys the thumb
         */
        destroy: function(){
            Ext.destroyMembers(this, 'tracker', 'el');
        }
    });

    /**
     * @class Ext.slider.MultiSlider
     * @extends Ext.BoxComponent
     * Slider which supports vertical or horizontal orientation, keyboard adjustments, configurable snapping, axis clicking and animation. Can be added as an item to any container. Example usage:
    <pre>
    new Ext.Slider({
        renderTo: Ext.getBody(),
        width: 200,
        value: 50,
        increment: 10,
        minValue: 0,
        maxValue: 100
    });
    </pre>
     * Sliders can be created with more than one thumb handle by passing an array of values instead of a single one:
    <pre>
    new Ext.Slider({
        renderTo: Ext.getBody(),
        width: 200,
        values: [25, 50, 75],
        minValue: 0,
        maxValue: 100,

        //this defaults to true, setting to false allows the thumbs to pass each other
        {@link #constrainThumbs}: false
    });
    </pre>
     */
    Ext.slider.MultiSlider = Ext.extend(Ext.BoxComponent, {
        /**
         * @cfg {Number} value The value to initialize the slider with. Defaults to minValue.
         */
        /**
         * @cfg {Boolean} vertical Orient the Slider vertically rather than horizontally, defaults to false.
         */
        vertical: false,
        /**
         * @cfg {Number} minValue The minimum value for the Slider. Defaults to 0.
         */
        minValue: 0,
        /**
         * @cfg {Number} maxValue The maximum value for the Slider. Defaults to 100.
         */
        maxValue: 100,
        /**
         * @cfg {Number/Boolean} decimalPrecision.
         * <p>The number of decimal places to which to round the Slider's value. Defaults to 0.</p>
         * <p>To disable rounding, configure as <tt><b>false</b></tt>.</p>
         */
        decimalPrecision: 0,
        /**
         * @cfg {Number} keyIncrement How many units to change the Slider when adjusting with keyboard navigation. Defaults to 1. If the increment config is larger, it will be used instead.
         */
        keyIncrement: 1,
        /**
         * @cfg {Number} increment How many units to change the slider when adjusting by drag and drop. Use this option to enable 'snapping'.
         */
        increment: 0,

        /**
         * @private
         * @property clickRange
         * @type Array
         * Determines whether or not a click to the slider component is considered to be a user request to change the value. Specified as an array of [top, bottom],
         * the click event's 'top' property is compared to these numbers and the click only considered a change request if it falls within them. e.g. if the 'top'
         * value of the click event is 4 or 16, the click is not considered a change request as it falls outside of the [5, 15] range
         */
        clickRange: [5,15],

        /**
         * @cfg {Boolean} clickToChange Determines whether or not clicking on the Slider axis will change the slider. Defaults to true
         */
        clickToChange : true,
        /**
         * @cfg {Boolean} animate Turn on or off animation. Defaults to true
         */
        animate: true,
        /**
         * @cfg {Boolean} constrainThumbs True to disallow thumbs from overlapping one another. Defaults to true
         */
        constrainThumbs: true,

        /**
         * @private
         * @property topThumbZIndex
         * @type Number
         * The number used internally to set the z index of the top thumb (see promoteThumb for details)
         */
        topThumbZIndex: 10000,

        // private override
        initComponent : function(){
            if(!Ext.isDefined(this.value)){
                this.value = this.minValue;
            }

            /**
             * @property thumbs
             * @type Array
             * Array containing references to each thumb
             */
            this.thumbs = [];

            Ext.slider.MultiSlider.superclass.initComponent.call(this);

            this.keyIncrement = Math.max(this.increment, this.keyIncrement);
            this.addEvents(
                /**
                 * @event beforechange
                 * Fires before the slider value is changed. By returning false from an event handler,
                 * you can cancel the event and prevent the slider from changing.
                 * @param {Ext.slider.MultiSlider} slider The slider
                 * @param {Number} newValue The new value which the slider is being changed to.
                 * @param {Number} oldValue The old value which the slider was previously.
                 */
                'beforechange',

                /**
                 * @event change
                 * Fires when the slider value is changed.
                 * @param {Ext.slider.MultiSlider} slider The slider
                 * @param {Number} newValue The new value which the slider has been changed to.
                 * @param {Ext.slider.Thumb} thumb The thumb that was changed
                 */
                'change',

                /**
                 * @event changecomplete
                 * Fires when the slider value is changed by the user and any drag operations have completed.
                 * @param {Ext.slider.MultiSlider} slider The slider
                 * @param {Number} newValue The new value which the slider has been changed to.
                 * @param {Ext.slider.Thumb} thumb The thumb that was changed
                 */
                'changecomplete',

                /**
                 * @event dragstart
                 * Fires after a drag operation has started.
                 * @param {Ext.slider.MultiSlider} slider The slider
                 * @param {Ext.EventObject} e The event fired from Ext.dd.DragTracker
                 */
                'dragstart',

                /**
                 * @event drag
                 * Fires continuously during the drag operation while the mouse is moving.
                 * @param {Ext.slider.MultiSlider} slider The slider
                 * @param {Ext.EventObject} e The event fired from Ext.dd.DragTracker
                 */
                'drag',

                /**
                 * @event dragend
                 * Fires after the drag operation has completed.
                 * @param {Ext.slider.MultiSlider} slider The slider
                 * @param {Ext.EventObject} e The event fired from Ext.dd.DragTracker
                 */
                'dragend'
            );

            /**
             * @property values
             * @type Array
             * Array of values to initalize the thumbs with
             */
            if (this.values == undefined || Ext.isEmpty(this.values)) this.values = [0];

            var values = this.values;

            for (var i=0; i < values.length; i++) {
                this.addThumb(values[i]);
            }

            if(this.vertical){
                Ext.apply(this, Ext.slider.Vertical);
            }
        },

        /**
         * Creates a new thumb and adds it to the slider
         * @param {Number} value The initial value to set on the thumb. Defaults to 0
         */
        addThumb: function(value) {
            var thumb = new Ext.slider.Thumb({
                value    : value,
                slider   : this,
                index    : this.thumbs.length,
                constrain: this.constrainThumbs
            });
            this.thumbs.push(thumb);

            //render the thumb now if needed
            if (this.rendered) thumb.render();
        },

        /**
         * @private
         * Moves the given thumb above all other by increasing its z-index. This is called when as drag
         * any thumb, so that the thumb that was just dragged is always at the highest z-index. This is
         * required when the thumbs are stacked on top of each other at one of the ends of the slider's
         * range, which can result in the user not being able to move any of them.
         * @param {Ext.slider.Thumb} topThumb The thumb to move to the top
         */
        promoteThumb: function(topThumb) {
            var thumbs = this.thumbs,
                zIndex, thumb;

            for (var i = 0, j = thumbs.length; i < j; i++) {
                thumb = thumbs[i];

                if (thumb == topThumb) {
                    zIndex = this.topThumbZIndex;
                } else {
                    zIndex = '';
                }

                thumb.el.setStyle('zIndex', zIndex);
            }
        },

        // private override
        onRender : function() {
            this.autoEl = {
                cls: 'x-slider ' + (this.vertical ? 'x-slider-vert' : 'x-slider-horz'),
                cn : {
                    cls: 'x-slider-end',
                    cn : {
                        cls:'x-slider-inner',
                        cn : [{tag:'a', cls:'x-slider-focus', href:"#", tabIndex: '-1', hidefocus:'on'}]
                    }
                }
            };

            Ext.slider.MultiSlider.superclass.onRender.apply(this, arguments);

            this.endEl   = this.el.first();
            this.innerEl = this.endEl.first();
            this.focusEl = this.innerEl.child('.x-slider-focus');

            //render each thumb
            for (var i=0; i < this.thumbs.length; i++) {
                this.thumbs[i].render();
            }

            //calculate the size of half a thumb
            var thumb      = this.innerEl.child('.x-slider-thumb');
            this.halfThumb = (this.vertical ? thumb.getHeight() : thumb.getWidth()) / 2;

            this.initEvents();
        },

        /**
         * @private
         * Adds keyboard and mouse listeners on this.el. Ignores click events on the internal focus element.
         * Creates a new DragTracker which is used to control what happens when the user drags the thumb around.
         */
        initEvents : function(){
            this.mon(this.el, {
                scope    : this,
                mousedown: this.onMouseDown,
                keydown  : this.onKeyDown
            });

            this.focusEl.swallowEvent("click", true);
        },

        /**
         * @private
         * Mousedown handler for the slider. If the clickToChange is enabled and the click was not on the draggable 'thumb',
         * this calculates the new value of the slider and tells the implementation (Horizontal or Vertical) to move the thumb
         * @param {Ext.EventObject} e The click event
         */
        onMouseDown : function(e){
            if(this.disabled){
                return;
            }

            //see if the click was on any of the thumbs
            var thumbClicked = false;
            for (var i=0; i < this.thumbs.length; i++) {
                thumbClicked = thumbClicked || e.target == this.thumbs[i].el.dom;
            }

            if (this.clickToChange && !thumbClicked) {
                var local = this.innerEl.translatePoints(e.getXY());
                this.onClickChange(local);
            }
            this.focus();
        },

        /**
         * @private
         * Moves the thumb to the indicated position. Note that a Vertical implementation is provided in Ext.slider.Vertical.
         * Only changes the value if the click was within this.clickRange.
         * @param {Object} local Object containing top and left values for the click event.
         */
        onClickChange : function(local) {
            if (local.top > this.clickRange[0] && local.top < this.clickRange[1]) {
                //find the nearest thumb to the click event
                var thumb = this.getNearest(local, 'left'),
                    index = thumb.index;

                this.setValue(index, Ext.util.Format.round(this.reverseValue(local.left), this.decimalPrecision), undefined, true);
            }
        },

        /**
         * @private
         * Returns the nearest thumb to a click event, along with its distance
         * @param {Object} local Object containing top and left values from a click event
         * @param {String} prop The property of local to compare on. Use 'left' for horizontal sliders, 'top' for vertical ones
         * @return {Object} The closest thumb object and its distance from the click event
         */
        getNearest: function(local, prop) {
            var localValue = prop == 'top' ? this.innerEl.getHeight() - local[prop] : local[prop],
                clickValue = this.reverseValue(localValue),
                nearestDistance = (this.maxValue - this.minValue) + 5, //add a small fudge for the end of the slider
                index = 0,
                nearest = null;

            for (var i=0; i < this.thumbs.length; i++) {
                var thumb = this.thumbs[i],
                    value = thumb.value,
                    dist  = Math.abs(value - clickValue);

                if (Math.abs(dist <= nearestDistance)) {
                    nearest = thumb;
                    index = i;
                    nearestDistance = dist;
                }
            }
            return nearest;
        },

        /**
         * @private
         * Handler for any keypresses captured by the slider. If the key is UP or RIGHT, the thumb is moved along to the right
         * by this.keyIncrement. If DOWN or LEFT it is moved left. Pressing CTRL moves the slider to the end in either direction
         * @param {Ext.EventObject} e The Event object
         */
        onKeyDown : function(e){
            /*
             * The behaviour for keyboard handling with multiple thumbs is currently undefined.
             * There's no real sane default for it, so leave it like this until we come up
             * with a better way of doing it.
             */
            if(this.disabled || this.thumbs.length !== 1){
                e.preventDefault();
                return;
            }
            var k = e.getKey(),
                val;
            switch(k){
                case e.UP:
                case e.RIGHT:
                    e.stopEvent();
                    val = e.ctrlKey ? this.maxValue : this.getValue(0) + this.keyIncrement;
                    this.setValue(0, val, undefined, true);
                break;
                case e.DOWN:
                case e.LEFT:
                    e.stopEvent();
                    val = e.ctrlKey ? this.minValue : this.getValue(0) - this.keyIncrement;
                    this.setValue(0, val, undefined, true);
                break;
                default:
                    e.preventDefault();
            }
        },

        /**
         * @private
         * If using snapping, this takes a desired new value and returns the closest snapped
         * value to it
         * @param {Number} value The unsnapped value
         * @return {Number} The value of the nearest snap target
         */
        doSnap : function(value){
            if (!(this.increment && value)) {
                return value;
            }
            var newValue = value,
                inc = this.increment,
                m = value % inc;
            if (m != 0) {
                newValue -= m;
                if (m * 2 >= inc) {
                    newValue += inc;
                } else if (m * 2 < -inc) {
                    newValue -= inc;
                }
            }
            return newValue.constrain(this.minValue,  this.maxValue);
        },

        // private
        afterRender : function(){
            Ext.slider.MultiSlider.superclass.afterRender.apply(this, arguments);

            for (var i=0; i < this.thumbs.length; i++) {
                var thumb = this.thumbs[i];

                if (thumb.value !== undefined) {
                    var v = this.normalizeValue(thumb.value);

                    if (v !== thumb.value) {
                        // delete this.value;
                        this.setValue(i, v, false);
                    } else {
                        this.moveThumb(i, this.translateValue(v), false);
                    }
                }
            };
        },

        /**
         * @private
         * Returns the ratio of pixels to mapped values. e.g. if the slider is 200px wide and maxValue - minValue is 100,
         * the ratio is 2
         * @return {Number} The ratio of pixels to mapped values
         */
        getRatio : function(){
            var w = this.innerEl.getWidth(),
                v = this.maxValue - this.minValue;
            return v == 0 ? w : (w/v);
        },

        /**
         * @private
         * Returns a snapped, constrained value when given a desired value
         * @param {Number} value Raw number value
         * @return {Number} The raw value rounded to the correct d.p. and constrained within the set max and min values
         */
        normalizeValue : function(v){
            v = this.doSnap(v);
            v = Ext.util.Format.round(v, this.decimalPrecision);
            v = v.constrain(this.minValue, this.maxValue);
            return v;
        },

        /**
         * Sets the minimum value for the slider instance. If the current value is less than the
         * minimum value, the current value will be changed.
         * @param {Number} val The new minimum value
         */
        setMinValue : function(val){
            this.minValue = val;
            var i = 0,
                thumbs = this.thumbs,
                len = thumbs.length,
                t;

            for(; i < len; ++i){
                t = thumbs[i];
                t.value = t.value < val ? val : t.value;
            }
            this.syncThumb();
        },

        /**
         * Sets the maximum value for the slider instance. If the current value is more than the
         * maximum value, the current value will be changed.
         * @param {Number} val The new maximum value
         */
        setMaxValue : function(val){
            this.maxValue = val;
            var i = 0,
                thumbs = this.thumbs,
                len = thumbs.length,
                t;

            for(; i < len; ++i){
                t = thumbs[i];
                t.value = t.value > val ? val : t.value;
            }
            this.syncThumb();
        },

        /**
         * Programmatically sets the value of the Slider. Ensures that the value is constrained within
         * the minValue and maxValue.
         * @param {Number} index Index of the thumb to move
         * @param {Number} value The value to set the slider to. (This will be constrained within minValue and maxValue)
         * @param {Boolean} animate Turn on or off animation, defaults to true
         */
        setValue : function(index, v, animate, changeComplete) {
            var thumb = this.thumbs[index],
                el    = thumb.el;

            v = this.normalizeValue(v);

            if (v !== thumb.value && this.fireEvent('beforechange', this, v, thumb.value, thumb) !== false) {
                thumb.value = v;
                if(this.rendered){
                    this.moveThumb(index, this.translateValue(v), animate !== false);
                    this.fireEvent('change', this, v, thumb);
                    if(changeComplete){
                        this.fireEvent('changecomplete', this, v, thumb);
                    }
                }
            }
        },

        /**
         * @private
         */
        translateValue : function(v) {
            var ratio = this.getRatio();
            return (v * ratio) - (this.minValue * ratio) - this.halfThumb;
        },

        /**
         * @private
         * Given a pixel location along the slider, returns the mapped slider value for that pixel.
         * E.g. if we have a slider 200px wide with minValue = 100 and maxValue = 500, reverseValue(50)
         * returns 200
         * @param {Number} pos The position along the slider to return a mapped value for
         * @return {Number} The mapped value for the given position
         */
        reverseValue : function(pos){
            var ratio = this.getRatio();
            return (pos + (this.minValue * ratio)) / ratio;
        },

        /**
         * @private
         * @param {Number} index Index of the thumb to move
         */
        moveThumb: function(index, v, animate){
            var thumb = this.thumbs[index].el;

            if(!animate || this.animate === false){
                thumb.setLeft(v);
            }else{
                thumb.shift({left: v, stopFx: true, duration:.35});
            }
        },

        // private
        focus : function(){
            this.focusEl.focus(10);
        },

        // private
        onResize : function(w, h){
            var thumbs = this.thumbs,
                len = thumbs.length,
                i = 0;

            /*
             * If we happen to be animating during a resize, the position of the thumb will likely be off
             * when the animation stops. As such, just stop any animations before syncing the thumbs.
             */
            for(; i < len; ++i){
                thumbs[i].el.stopFx();
            }
            // check to see if we're using an auto width
            if(Ext.isNumber(w)){
                this.innerEl.setWidth(w - (this.el.getPadding('l') + this.endEl.getPadding('r')));
            }
            this.syncThumb();
            Ext.slider.MultiSlider.superclass.onResize.apply(this, arguments);
        },

        //private
        onDisable: function(){
            Ext.slider.MultiSlider.superclass.onDisable.call(this);

            for (var i=0; i < this.thumbs.length; i++) {
                var thumb = this.thumbs[i],
                    el    = thumb.el;

                thumb.disable();

                if(Ext.isIE){
                    //IE breaks when using overflow visible and opacity other than 1.
                    //Create a place holder for the thumb and display it.
                    var xy = el.getXY();
                    el.hide();

                    this.innerEl.addClass(this.disabledClass).dom.disabled = true;

                    if (!this.thumbHolder) {
                        this.thumbHolder = this.endEl.createChild({cls: 'x-slider-thumb ' + this.disabledClass});
                    }

                    this.thumbHolder.show().setXY(xy);
                }
            }
        },

        //private
        onEnable: function(){
            Ext.slider.MultiSlider.superclass.onEnable.call(this);

            for (var i=0; i < this.thumbs.length; i++) {
                var thumb = this.thumbs[i],
                    el    = thumb.el;

                thumb.enable();

                if (Ext.isIE) {
                    this.innerEl.removeClass(this.disabledClass).dom.disabled = false;

                    if (this.thumbHolder) this.thumbHolder.hide();

                    el.show();
                    this.syncThumb();
                }
            }
        },

        /**
         * Synchronizes the thumb position to the proper proportion of the total component width based
         * on the current slider {@link #value}.  This will be called automatically when the Slider
         * is resized by a layout, but if it is rendered auto width, this method can be called from
         * another resize handler to sync the Slider if necessary.
         */
        syncThumb : function() {
            if (this.rendered) {
                for (var i=0; i < this.thumbs.length; i++) {
                    this.moveThumb(i, this.translateValue(this.thumbs[i].value));
                }
            }
        },

        /**
         * Returns the current value of the slider
         * @param {Number} index The index of the thumb to return a value for
         * @return {Number} The current value of the slider
         */
        getValue : function(index) {
            return this.thumbs[index].value;
        },

        /**
         * Returns an array of values - one for the location of each thumb
         * @return {Array} The set of thumb values
         */
        getValues: function() {
            var values = [];

            for (var i=0; i < this.thumbs.length; i++) {
                values.push(this.thumbs[i].value);
            }

            return values;
        },

        // private
        beforeDestroy : function(){
            var thumbs = this.thumbs;
            for(var i = 0, len = thumbs.length; i < len; ++i){
                thumbs[i].destroy();
                thumbs[i] = null;
            }
            Ext.destroyMembers(this, 'endEl', 'innerEl', 'focusEl', 'thumbHolder');
            Ext.slider.MultiSlider.superclass.beforeDestroy.call(this);
        }
    });

    Ext.reg('multislider', Ext.slider.MultiSlider);

    /**
     * @class Ext.slider.SingleSlider
     * @extends Ext.slider.MultiSlider
     * Slider which supports vertical or horizontal orientation, keyboard adjustments,
     * configurable snapping, axis clicking and animation. Can be added as an item to
     * any container. Example usage:
    <pre><code>
    new Ext.slider.SingleSlider({
        renderTo: Ext.getBody(),
        width: 200,
        value: 50,
        increment: 10,
        minValue: 0,
        maxValue: 100
    });
    </code></pre>
     * The class Ext.slider.SingleSlider is aliased to Ext.Slider for backwards compatibility.
     */
    Ext.slider.SingleSlider = Ext.extend(Ext.slider.MultiSlider, {
        constructor: function(config) {
          config = config || {};

          Ext.applyIf(config, {
              values: [config.value || 0]
          });

          Ext.slider.SingleSlider.superclass.constructor.call(this, config);
        },

        /**
         * Returns the current value of the slider
         * @return {Number} The current value of the slider
         */
        getValue: function() {
            //just returns the value of the first thumb, which should be the only one in a single slider
            return Ext.slider.SingleSlider.superclass.getValue.call(this, 0);
        },

        /**
         * Programmatically sets the value of the Slider. Ensures that the value is constrained within
         * the minValue and maxValue.
         * @param {Number} value The value to set the slider to. (This will be constrained within minValue and maxValue)
         * @param {Boolean} animate Turn on or off animation, defaults to true
         */
        setValue: function(value, animate) {
            var args = Ext.toArray(arguments),
                len  = args.length;

            //this is to maintain backwards compatiblity for sliders with only one thunb. Usually you must pass the thumb
            //index to setValue, but if we only have one thumb we inject the index here first if given the multi-slider
            //signature without the required index. The index will always be 0 for a single slider
            if (len == 1 || (len <= 3 && typeof arguments[1] != 'number')) {
                args.unshift(0);
            }

            return Ext.slider.SingleSlider.superclass.setValue.apply(this, args);
        },

        /**
         * Synchronizes the thumb position to the proper proportion of the total component width based
         * on the current slider {@link #value}.  This will be called automatically when the Slider
         * is resized by a layout, but if it is rendered auto width, this method can be called from
         * another resize handler to sync the Slider if necessary.
         */
        syncThumb : function() {
            return Ext.slider.SingleSlider.superclass.syncThumb.apply(this, [0].concat(arguments));
        },

        // private
        getNearest : function(){
            // Since there's only 1 thumb, it's always the nearest
            return this.thumbs[0];
        }
    });

    //backwards compatibility
    Ext.Slider = Ext.slider.SingleSlider;

    Ext.reg('slider', Ext.slider.SingleSlider);

    // private class to support vertical sliders
    Ext.slider.Vertical = {
        onResize : function(w, h){
            this.innerEl.setHeight(h - (this.el.getPadding('t') + this.endEl.getPadding('b')));
            this.syncThumb();
        },

        getRatio : function(){
            var h = this.innerEl.getHeight(),
                v = this.maxValue - this.minValue;
            return h/v;
        },

        moveThumb: function(index, v, animate) {
            var thumb = this.thumbs[index],
                el    = thumb.el;

            if (!animate || this.animate === false) {
                el.setBottom(v);
            } else {
                el.shift({bottom: v, stopFx: true, duration:.35});
            }
        },

        onClickChange : function(local) {
            if (local.left > this.clickRange[0] && local.left < this.clickRange[1]) {
                var thumb = this.getNearest(local, 'top'),
                    index = thumb.index,
                    value = this.minValue + this.reverseValue(this.innerEl.getHeight() - local.top);

                this.setValue(index, Ext.util.Format.round(value, this.decimalPrecision), undefined, true);
            }
        }
    };

    //private class to support vertical dragging of thumbs within a slider
    Ext.slider.Thumb.Vertical = {
        getNewValue: function() {
            var slider   = this.slider,
                innerEl  = slider.innerEl,
                pos      = innerEl.translatePoints(this.tracker.getXY()),
                bottom   = innerEl.getHeight() - pos.top;

            return slider.minValue + Ext.util.Format.round(bottom / slider.getRatio(), slider.decimalPrecision);
        }
    };