#

API Docs for: 3.10.3
Show: Inherited Protected Private Deprecated

# File: dial/js/Dial.js

    /**
     * Create a circular dial value range input visualized as a draggable handle on a
     * background element.
     *
     * @module dial
     */
        var supportsVML = false;
            //testVMLNode;

        if (Y.UA.ie && Y.UA.ie < 9){
            supportsVML = true;
        }

        var Lang = Y.Lang,
            Widget = Y.Widget,
            Node = Y.Node;

        /**
         * Create a dial to represent an input control capable of representing a
         * series of intermediate states based on the position of the Dial's handle.
         * These states are typically aligned to a value algorithm whereby the angle of the handle's
         * position corresponds to a given value.
         *
         * @class Dial
         * @extends Widget
         * @param config {Object} Configuration object
         * @constructor
         */
        function Dial(config) {
            Dial.superclass.constructor.apply(this, arguments);
        }

        // Y.Dial static properties

        /**
         * The identity of the widget.
         *
         * @property NAME
         * @type String
         * @default 'dial'
         * @readOnly
         * @protected
         * @static
         */
        Dial.NAME = "dial";

        /**
         * Static property used to define the default attribute configuration of
         * the Widget.
         *
         * @property ATTRS
         * @type {Object}
         * @protected
         * @static
         */
        Dial.ATTRS = {

            /**
             * minimum value allowed
             *
             * @attribute min
             * @type {Number}
             * @default -220
             */
            min : {
                value:-220
            },

            /**
             * maximum value allowed
             *
             * @attribute max
             * @type {Number}
             * @default 220
             */
            max : {
                value:220
            },

            /**
             * diameter of the circular background object.
             * Other objects scale accordingly.
             * Set this only before rendering.
             *
             * @attribute diameter
             * @type {Number} the number of px in diameter
             * @default 100
             * @writeOnce
             */
            diameter : {
                value:100
            },

            /**
             * diameter of the handle object which users drag to change the value.
             * Dial sets the pixel dimension of the handle equal to handleDiameter * diameter.
             * Set this only before rendering.
             *
             * @attribute handleDiameter
             * @type {Number}
             * @default 0.2
             * @writeOnce
             */
            handleDiameter : {
                value:0.2
            },

            /**
             * diameter of the marker object which follows the angle of the handle during value changes.
             * Dial sets the pixel dimension of the marker equal to markerDiameter * diameter.
             * Set this only before rendering.
             *
             * @attribute markerDiameter
             * @type {Number}
             * @default 0.1
             * @writeOnce
             */
            markerDiameter : {
                value:0.1
            },

            /**
             * diameter of the center button object.
             * Dial sets the pixel dimension of the centerButton equal to centerButtonDiameter * diameter.
             * Set this only before rendering.
             *
             * @attribute centerButtonDiameter
             * @type {Number}
             * @default 0.1
             * @writeOnce
             */
            centerButtonDiameter : {
                value:0.5
            },

            /**
             * initial value of the Dial
             *
             * @attribute value
             * @type {Number}
             * @default 0
             */
            value : {
                value:0,
                validator: function(val) {
                    return this._validateValue(val);
                }
            },

            /**
             * amount to increment/decrement the dial value
             * when the arrow up/down/left/right keys are pressed
             *
             * @attribute minorStep
             * @type {Number}
             * @default 1
             */
            minorStep : {
                value:1
            },

            /**
             * amount to increment/decrement the dial value
             * when the page up/down keys are pressed
             *
             * @attribute majorStep
             * @type {Number}
             * @default 10
             */
            majorStep : {
                value:10
            },

            /**
             * number of value increments in one 360 degree revolution
             * of the handle around the dial
             *
             * @attribute stepsPerRevolution
             * @type {Number}
             * @default 100
             */
            stepsPerRevolution : {
                value:100
            },

            /**
             * number of decimal places of accuracy in the value
             *
             * @attribute decimalPlaces
             * @type {Number}
             * @default 0
             */
            decimalPlaces : {
                value:0
            },

            /**
             * visible strings for the dial UI. This attribute is
             * defined by the base Widget class but has an empty value. The
             * Dial is simply providing a default value for the attribute.
             * Gets localized strings in the current language
             *
             * @attribute strings
             * @type {Object} the values are HTML strings
             * @default {label: 'My label', resetStr: 'Reset', tooltipHandle: 'Drag to set value'}
             */
            strings: {
                valueFn: function () {
                    return Y.Intl.get('dial');
                }
            },

            /**
             * distance from the center of the dial to the
             * center of the marker and handle, when at rest.
             * The value is a percent of the radius of the dial.
             *
             * @attribute handleDistance
             * @type {number}
             * @default 0.75
             */
            handleDistance:{
                value:0.75
            }

        };

        /**
         * returns a properly formed yui class name
         *
         * @method
         * @param {String} string to be appended at the end of class name
         * @return
         * @private
         */
        function makeClassName(str) {
            return Y.ClassNameManager.getClassName(Dial.NAME, str);
        }

    	 /** array of static constants used to identify the classname applied to the Dial DOM objects
    	 *
         * @property CSS_CLASSES
         * @type {Array}
         * @private
         * @static
         */
        Dial.CSS_CLASSES = {
            label : makeClassName("label"),
            labelString : makeClassName("label-string"),
            valueString : makeClassName("value-string"),
            northMark : makeClassName("north-mark"),
            ring : makeClassName('ring'),
            ringVml : makeClassName('ring-vml'),
            marker : makeClassName("marker"),
            markerVml : makeClassName("marker-vml"),
            markerMaxMin : makeClassName("marker-max-min"),
            centerButton : makeClassName("center-button"),
            centerButtonVml : makeClassName('center-button-vml'),
            resetString : makeClassName("reset-string"),
            handle : makeClassName("handle"),
            handleVml : makeClassName("handle-vml"),
            hidden : makeClassName("hidden"),
            dragging : Y.ClassNameManager.getClassName("dd-dragging")
        };

        /* Static constants used to define the markup templates used to create Dial DOM elements */

        /**
         * template that will contain the Dial's label.
         *
         * @property LABEL_TEMPLATE
         * @type {HTML}
         * @default &lt;div class="[...-label]">&lt;span id="" class="[...-label-string]">{label}&lt;/span>&lt;span class="[...-value-string]">&lt;/span>&lt;/div>
         * @protected
         */

    	Dial.LABEL_TEMPLATE = '<div class="' + Dial.CSS_CLASSES.label + '"><span id="" class="' + Dial.CSS_CLASSES.labelString + '">{label}</span><span class="' + Dial.CSS_CLASSES.valueString + '"></span></div>';

    	if(supportsVML === false){
    		/**
    		 * template that will contain the Dial's background ring.
    		 *
    		 * @property RING_TEMPLATE
    		 * @type {HTML}
    		 * @default &lt;div class="[...-ring]">&lt;div class="[...-northMark]">&lt;/div>&lt;/div>
    		 * @protected
    		 */
    		Dial.RING_TEMPLATE = '<div class="' + Dial.CSS_CLASSES.ring + '"><div class="' + Dial.CSS_CLASSES.northMark + '"></div></div>';

    		/**
    		 * template that will contain the Dial's current angle marker.
    		 *
    		 * @property MARKER_TEMPLATE
    		 * @type {HTML}
    		 * @default &lt;div class="[...-marker] [...-marker-hidden]">&lt;div class="[...-markerUser]">&lt;/div>&lt;/div>
    		 * @protected
    		 */
    		Dial.MARKER_TEMPLATE = '<div class="' + Dial.CSS_CLASSES.marker + ' ' + Dial.CSS_CLASSES.hidden + '"></div>';

    		/**
    		 * template that will contain the Dial's center button.
    		 *
    		 * @property CENTER_BUTTON_TEMPLATE
    		 * @type {HTML}
    		 * @default &lt;div class="[...-centerButton]">&lt;div class="[...-resetString]">' + Y.Lang.sub('{resetStr}', Dial.ATTRS.strings.value) + '&lt;/div>&lt;/div>
    		 * @protected
    		 */
    		Dial.CENTER_BUTTON_TEMPLATE = '<div class="' + Dial.CSS_CLASSES.centerButton + '"><div class="' + Dial.CSS_CLASSES.resetString + ' ' + Dial.CSS_CLASSES.hidden + '">{resetStr}</div></div>';

    		/**
    		 * template that will contain the Dial's handle.
    		 *
    		 * @property HANDLE_TEMPLATE
    		 * @type {HTML}
    		 * @default &lt;div class="[...-handle]">&lt;div class="[...-handleUser]" aria-labelledby="" aria-valuetext="" aria-valuemax="" aria-valuemin="" aria-valuenow="" role="slider"  tabindex="0">&lt;/div>&lt;/div>';// title="{tooltipHandle}"
    		 * @protected
    		 */
    		Dial.HANDLE_TEMPLATE = '<div class="' + Dial.CSS_CLASSES.handle + '" aria-labelledby="" aria-valuetext="" aria-valuemax="" aria-valuemin="" aria-valuenow="" role="slider"  tabindex="0" title="{tooltipHandle}">';

    	}else{ // VML case
    		Dial.RING_TEMPLATE = '<div class="' + Dial.CSS_CLASSES.ring +  ' ' + Dial.CSS_CLASSES.ringVml + '">'+
    								'<div class="' + Dial.CSS_CLASSES.northMark + '"></div>'+
    									'<v:oval strokecolor="#ceccc0" strokeweight="1px"><v:fill type=gradient color="#8B8A7F" color2="#EDEDEB" angle="45"/></v:oval>'+
    								'</div>'+
    								'';
    		Dial.MARKER_TEMPLATE = '<div class="' + Dial.CSS_CLASSES.markerVml + ' ' + Dial.CSS_CLASSES.hidden + '">'+
    										'<v:oval stroked="false">'+
    											'<v:fill opacity="20%" color="#000"/>'+
    										'</v:oval>'+
    								'</div>'+
    								'';
    		Dial.CENTER_BUTTON_TEMPLATE = '<div class="' + Dial.CSS_CLASSES.centerButton + ' ' + Dial.CSS_CLASSES.centerButtonVml + '">'+
    											'<v:oval strokecolor="#ceccc0" strokeweight="1px">'+
    												'<v:fill type=gradient color="#C7C5B9" color2="#fefcf6" colors="35% #d9d7cb, 65% #fefcf6" angle="45"/>'+
    												'<v:shadow on="True" color="#000" opacity="10%" offset="2px, 2px"/>'+
    											'</v:oval>'+
    											'<div class="' + Dial.CSS_CLASSES.resetString + ' ' + Dial.CSS_CLASSES.hidden + '">{resetStr}</div>'+
    									'</div>'+
    									'';
    		Dial.HANDLE_TEMPLATE = '<div class="' + Dial.CSS_CLASSES.handleVml + '" aria-labelledby="" aria-valuetext="" aria-valuemax="" aria-valuemin="" aria-valuenow="" role="slider"  tabindex="0" title="{tooltipHandle}">'+
    										'<v:oval stroked="false">'+
    											'<v:fill opacity="20%" color="#6C3A3A"/>'+
    										'</v:oval>'+
    								'</div>'+
    								'';
    	}

        /* Dial extends the base Widget class */
        Y.extend(Dial, Widget, {

            /**
             * creates the DOM structure for the Dial.
             *
             * @method renderUI
             * @protected
             */
            renderUI : function() {
                this._renderLabel();
                this._renderRing();
                this._renderMarker();
                this._renderCenterButton();
                this._renderHandle();

                // object handles
                this.contentBox = this.get("contentBox");

                // constants
                this._originalValue = this.get('value');
                this._minValue = this.get('min'); // saves doing a .get many times, but we need to remember to update this if/when we allow changing min or max after instantiation
                this._maxValue = this.get('max');
                this._stepsPerRevolution = this.get('stepsPerRevolution');
                this._minTimesWrapped = (Math.floor(this._minValue / this._stepsPerRevolution - 1));
                this._maxTimesWrapped = (Math.floor(this._maxValue / this._stepsPerRevolution + 1));

                // variables
                this._timesWrapped = 0;
                this._angle = this._getAngleFromValue(this.get('value'));
                this._prevAng = this._angle;

                // init
                this._setTimesWrappedFromValue(this._originalValue);
                this._handleNode.set('aria-valuemin', this._minValue);
                this._handleNode.set('aria-valuemax', this._maxValue);
            },

            /**
             * Sets -webkit-border-radius to 50% of width/height of the ring, handle, marker, and center-button.
             * This is needed for iOS 3.x.
             * The objects render square if the radius is > 50% of the width/height
             * @method _setBorderRadius
             * @private
             */
            _setBorderRadius : function(){
                this._ringNode.setStyles({'WebkitBorderRadius':this._ringNodeRadius + 'px',
                                            'MozBorderRadius':this._ringNodeRadius + 'px',
                                            'borderRadius':this._ringNodeRadius + 'px'
                                         });
                this._handleNode.setStyles({'WebkitBorderRadius':this._handleNodeRadius + 'px',
                                            'MozBorderRadius':this._handleNodeRadius + 'px',
                                            'borderRadius':this._handleNodeRadius + 'px'
                                         });
                this._markerNode.setStyles({'WebkitBorderRadius':this._markerNodeRadius + 'px',
                                            'MozBorderRadius':this._markerNodeRadius + 'px',
                                            'borderRadius':this._markerNodeRadius + 'px'
                                         });
                this._centerButtonNode.setStyles({'WebkitBorderRadius':this._centerButtonNodeRadius + 'px',
                                            'MozBorderRadius':this._centerButtonNodeRadius + 'px',
                                            'borderRadius':this._centerButtonNodeRadius + 'px'
                                         });
            },

            /**
             * Handles the mouseenter on the centerButton
             *
             * @method _handleCenterButtonEnter
             * @protected
             */
            _handleCenterButtonEnter : function(){
                this._resetString.removeClass(Dial.CSS_CLASSES.hidden);
            },

            /**
             * Handles the mouseleave on the centerButton
             *
             * @method _handleCenterButtonLeave
             * @protected
             */
            _handleCenterButtonLeave : function(){
                this._resetString.addClass(Dial.CSS_CLASSES.hidden);
            },

            /**
             * Creates the Y.DD.Drag instance used for the handle movement and
             * binds Dial interaction to the configured value model.
             *
             * @method bindUI
             * @protected
             */
            bindUI : function() {

                this.after("valueChange", this._afterValueChange);

                var boundingBox = this.get("boundingBox"),
                    // Looking for a key event which will fire continously across browsers while the key is held down.
                    keyEvent = (!Y.UA.opera) ? "down:" : "press:",
                    // 38, 40 = arrow up/down, 33, 34 = page up/down,  35 , 36 = end/home
                    keyEventSpec = keyEvent + "38,40,33,34,35,36",
                    // 37 , 39 = arrow left/right
                    keyLeftRightSpec = keyEvent + "37,39",
                    // 37 , 39 = arrow left/right + meta (command/apple key) for mac
                    keyLeftRightSpecMeta = keyEvent + "37+meta,39+meta",
                    Drag = Y.DD.Drag;

                Y.on("key", Y.bind(this._onDirectionKey, this), boundingBox, keyEventSpec);
                Y.on("key", Y.bind(this._onLeftRightKey, this), boundingBox, keyLeftRightSpec);
                boundingBox.on("key", this._onLeftRightKeyMeta, keyLeftRightSpecMeta, this);

                Y.on('mouseenter', Y.bind(this._handleCenterButtonEnter, this), this._centerButtonNode);
                Y.on('mouseleave', Y.bind(this._handleCenterButtonLeave, this), this._centerButtonNode);
                // Needed to replace mousedown/up with gesturemovestart/end to make behavior on touch devices work the same.
                Y.on('gesturemovestart', Y.bind(this._resetDial, this), this._centerButtonNode);  //[#2530441]
                Y.on('gesturemoveend', Y.bind(this._handleCenterButtonMouseup, this), this._centerButtonNode);

                Y.on(Drag.START_EVENT, Y.bind(this._handleHandleMousedown, this), this._handleNode);
                Y.on(Drag.START_EVENT, Y.bind(this._handleMousedown, this), this._ringNode); // [#2530766]

                //TODO: Can this be merged this into the drag:end event listener to avoid another registration?
                Y.on('gesturemoveend', Y.bind(this._handleRingMouseup, this), this._ringNode);

                this._dd1 = new Drag({ //// [#2530206] changed global this._dd1 from just var dd1 = new Y.DD.drag so
                    node: this._handleNode,
                    on : {
                        'drag:drag' : Y.bind(this._handleDrag, this),
                        'drag:start' : Y.bind(this._handleDragStart, this),
                        'drag:end' : Y.bind(this._handleDragEnd, this) //,
                    }
                });
                Y.bind(this._dd1.addHandle(this._ringNode), this); // [#2530206] added the ring as a handle to the dd1 (the dd of the handleNode)
            },

            /**
             * Sets _timesWrapped based on Dial value
             * to net integer revolutions the user dragged the handle around the Dial
             *
             * @method _setTimesWrappedFromValue
             * @param val {Number} current value of the Dial
             * @private
             */
            _setTimesWrappedFromValue : function(val){
                if(val % this._stepsPerRevolution === 0){
                    this._timesWrapped = (val / this._stepsPerRevolution);
                }else{
                    this._timesWrapped = Math.floor(val / this._stepsPerRevolution);
                }
            },

            /**
             * gets the angle of the line from the center of the Dial to the center of the handle
             *
             * @method _getAngleFromHandleCenter
             * @param handleCenterX {number}
             * @param handleCenterY {number}
             * @return ang {number} the angle
             * @protected
             */
            _getAngleFromHandleCenter : function(handleCenterX, handleCenterY){
                var ang = Math.atan( (this._dialCenterY - handleCenterY)  /  (this._dialCenterX - handleCenterX)  ) * (180 / Math.PI);
                ang = ((this._dialCenterX - handleCenterX) < 0) ? ang + 90 : ang + 90 + 180; // Compensate for neg angles from Math.atan
                return ang;
            },

            /**
             * calculates the XY of the center of the dial relative to the ring node.
             * This is needed for calculating the angle of the handle
             *
             * @method _calculateDialCenter
             * @protected
             */
            _calculateDialCenter : function(){ // #2531111 value, and marker don't track handle when dial position changes on page (resize when inline)
                this._dialCenterX = this._ringNode.get('offsetWidth') / 2;
                this._dialCenterY = this._ringNode.get('offsetHeight') / 2;
            },

            /**
             * Handles the mouseup on the ring
             *
             * @method _handleRingMouseup
             * @protected
             */
            _handleRingMouseup : function(){
                this._handleNode.focus();  // need to re-focus on the handle so keyboard is accessible [#2530206]
            },

            /**
             * Handles the mouseup on the centerButton
             *
             * @method _handleCenterButtonMouseup
             * @protected
             */
            _handleCenterButtonMouseup : function(){
                this._handleNode.focus();  // need to re-focus on the handle so keyboard is accessible [#2530206]
            },

            /**
             * Handles the mousedown on the handle
             *
             * @method _handleHandleMousedown
             * @protected
             */
            _handleHandleMousedown : function(){
                this._handleNode.focus();  // need to re-focus on the handle so keyboard is accessible [#2530206]
                // this is better done here instead of on _handleDragEnd
                // because we should make the keyboard accessible after a click of the handle
            },

            /**
             * handles the user dragging the handle around the Dial, gets the angle,
             * checks for wrapping around top center.
             * Sets the new value of the Dial
             *
             * @method _handleDrag
             * @param e {DOMEvent} the drag event object
             * @protected
             */
            _handleDrag : function(e){
                var handleCenterX,
                handleCenterY,
                ang,
                newValue;

                // The event was emitted from drag:drag of handle.
                // The center of the handle is top left position of the handle node + radius of handle.
                // This is different than a mousedown on the ring.
                handleCenterX = (parseInt(this._handleNode.getStyle('left'),10) + this._handleNodeRadius);
                handleCenterY = (parseInt(this._handleNode.getStyle('top'),10) + this._handleNodeRadius);
                ang = this._getAngleFromHandleCenter(handleCenterX, handleCenterY);

                // check for need to set timesWrapped
                if((this._prevAng > 270) && (ang < 90)){ // If wrapping, clockwise
                    if(this._timesWrapped < this._maxTimesWrapped){
                        this._timesWrapped = (this._timesWrapped + 1);
                    }
                }else if((this._prevAng < 90) && (ang > 270)){ // if un-wrapping, counter-clockwise
                    if(this._timesWrapped > this._minTimesWrapped){
                       this._timesWrapped = (this._timesWrapped - 1);
                    }
                }
                newValue = this._getValueFromAngle(ang); // This function needs the current _timesWrapped value. That's why it comes after the _timesWrapped code above

                // If you've gone past max more than one full revolution, we decrement the _timesWrapped value
                // This gives the effect of a ratchet mechanism.
                // It feels like you are never more than one revolution past max
                // The effect is the same for min, only in reverse.
                // We can't reset the _timesWrapped to the max or min here.
                // If we did, the next (continuous) drag would reset the value incorrectly.
                if(newValue > (this._maxValue + this._stepsPerRevolution) ){
                    this._timesWrapped --;
                }else if(newValue < (this._minValue - this._stepsPerRevolution) ){
                    this._timesWrapped ++;
                }
                this._prevAng = ang; // need to keep the previous angle in order to check for wrapping on the next drag, click, or keypress

                this._handleValuesBeyondMinMax(e, newValue);
            },

            /**
             * handles a mousedown or gesturemovestart event on the ring node
             *
             * @method _handleMousedown
             * @param e {DOMEvent} the event object
             * @private
             */
            _handleMousedown : function(e){ // #2530306

                if (this._ringNode.compareTo(e.target)) {
                    var minAng = this._getAngleFromValue(this._minValue),
                    maxAng = this._getAngleFromValue(this._maxValue),
                    newValue, oppositeMidRangeAngle,
                    handleCenterX, handleCenterY,
                    ang;

                    // The event was emitted from mousedown on the ring node,
                    // so the center of the handle should be the XY of mousedown.
                    if(Y.UA.ios){  // ios adds the scrollLeft and top onto clientX and Y in a native click
                        handleCenterX = (e.clientX - this._ringNode.getX());
                        handleCenterY = (e.clientY - this._ringNode.getY());
                    }else{
                        handleCenterX = (e.clientX + Y.one('document').get('scrollLeft') - this._ringNode.getX());
                        handleCenterY = (e.clientY + Y.one('document').get('scrollTop') - this._ringNode.getY());
                    }
                    ang = this._getAngleFromHandleCenter(handleCenterX, handleCenterY);

                    /* ///////////////////////////////////////////////////////////////////////////////////////////////////////
                    * The next sections of logic
                    * set this._timesWrapped in the different cases of value range
                    * and value range position,
                    * then the Dial value is set at the end of this method
                    */ ///////////////////////////////////////////////////////////////////////////////////////////////////////

                    ////////////////////////////////////////////////////////////////////////////////////////////////////////////
                    if(this._maxValue - this._minValue > this._stepsPerRevolution){

                    // Case: range min-to-max is greater than stepsPerRevolution (one revolution)

                        // This checks the shortest way around the dial between the prevAng and this ang.
                        if(Math.abs(this._prevAng - ang) > 180){ // this crossed a wrapping

                            // Only change the _timesWrapped if it's between minTimesWrapped and maxTimesWrapped
                            if((this._timesWrapped > this._minTimesWrapped) &&
                               (this._timesWrapped < this._maxTimesWrapped)
                            ){
                                // this checks which direction, clock wise or CCW and incr or decr _timesWrapped
                                this._timesWrapped = ((this._prevAng - ang) > 0) ? (this._timesWrapped + 1) : (this._timesWrapped - 1);
                            }
                        // special case of getting un-stuck from a min value case
                        // where timesWrapped is minTimesWrapped but new ang won't trigger a cross wrap boundry
                        // because prevAng is set to 0 or > 0
                        }else if(
                                (this._timesWrapped === this._minTimesWrapped) &&
                                (ang - this._prevAng < 180)
                        ){
                            this._timesWrapped ++;
                        } //it didn't cross a wrapping boundary

                    } /////////////////////////////////////////////////////////////////////////////////////////////////////////
                    else if(this._maxValue - this._minValue === this._stepsPerRevolution){
                    // Case: range min-to-max === stepsPerRevolution     (one revolution)
                    // This means min and max will be at same angle
                    // This does not mean they are at "north"

                        if(ang < minAng){ // if mousedown angle is < minAng (and maxAng, because they're the same)
                                          // The only way it can be, is if min and max are not at north
                            this._timesWrapped = 1;
                        }else{
                            this._timesWrapped = 0;
                        }

                    } //////////////////////////////////////////////////////////////////////////////////////////////////////////
                    else if(minAng > maxAng){
                    // Case: range includes the wrap point (north)
                    // Because of "else if"...
                    // range is < stepsPerRevolution

                        if(
                           (this._prevAng >= minAng) && // if prev angle was greater than angle of min and...
                           (ang <= (minAng + maxAng) / 2) // the angle of this click is less than
                                                          // the angle opposite the mid-range angle, then...
                        ){
                            this._timesWrapped ++;
                        }else if(
                            (this._prevAng <= maxAng) &&
                            // if prev angle is < max angle and...

                            (ang > (minAng + maxAng) / 2)
                            // the angle of this click is greater than,
                            // the angle opposite the mid-range angle and...

                        ){
                            this._timesWrapped --;
                        }

                    } ////////////////////////////////////////////////////////////////////////////////////////////////////
                    else{
                    // "else" Case: min-to-max range doesn't include the wrap point
                    // Because of "else if"...
                    // range is still < stepsPerRevolution

                        if ((ang < minAng) || (ang > maxAng)){ // angle is out of range
                            oppositeMidRangeAngle = (((minAng + maxAng) / 2) + 180) % 360;
                            // This is the bisection of the min-to-max range + 180.  (opposite the bisection)

                            if(oppositeMidRangeAngle > 180){
                                newValue = ((maxAng < ang) && (ang < oppositeMidRangeAngle)) ? this.get('max') : this.get('min');
                            }else{ //oppositeMidRangeAngle <= 180
                                newValue = ((minAng > ang) && (ang > oppositeMidRangeAngle)) ? this.get('min') : this.get('max');
                            }
                            this._prevAng = this._getAngleFromValue(newValue);
                            this.set('value', newValue);
                            this._setTimesWrappedFromValue(newValue);
                            return;
                        }
                    }

                    // Now that _timesWrapped is set, set newValue .......................................................................
                    newValue = this._getValueFromAngle(ang); // This function needs the correct, current _timesWrapped value.

                    /* updating _prevAng (previous angle)
                     * When past min or max, _prevAng is set to the angle of min or max
                     * Don't do this in a drag method, or it will affect wrapping,
                     * causing the marker to stick at min, when min is 0 degrees (north)
                     * #2532878
                     */
                    if (newValue > this._maxValue) {
                        this._prevAng = this._getAngleFromValue(this._maxValue);  // #2530766 need for mousedown on the ring; causes prob for drag
                    } else if (newValue < this._minValue) {
                        this._prevAng = this._getAngleFromValue(this._minValue);
                    } else {
                        this._prevAng = ang;
                    }

                    this._handleValuesBeyondMinMax(e, newValue);
                }
            },

            /**
             * handles the case where the value is less than min or greater than max
             * This is used both when handle is dragged and when the ring is clicked
             *
             * @method _handleValuesBeyondMinMax
             * @param e {DOMEvent} the event object
             * @param newValue {number} current value of the dial
             * @protected
             */
            _handleValuesBeyondMinMax : function(e, newValue){ // #2530306
                // If _getValueFromAngle() is passed 0, it increments the _timesWrapped value.
                // handle hitting max and min and going beyond, stops at max or min
                if((newValue >= this._minValue) && (newValue <= this._maxValue)) {
                    this.set('value', newValue);
                    // [#2530206] transfer the mousedown event from the _ringNode to the _handleNode drag, so we can mousedown, then continue dragging
                    if(e.currentTarget === this._ringNode){
                        // Delegate to DD's natural behavior
                        this._dd1._handleMouseDownEvent(e);
                    }
                } else if (newValue > this._maxValue) {
                    this.set('value', this._maxValue);
                } else if (newValue < this._minValue) {
                    this.set('value', this._minValue);
                }
            },

            /**
             * handles the user starting to drag the handle around the Dial
             *
             * @method _handleDragStart
             * @param e {DOMEvent} the drag event object
             * @protected
             */
            _handleDragStart : function(e){
                this._markerNode.removeClass(Dial.CSS_CLASSES.hidden);
            },

            /*
             * When handle is handleDragEnd, this animates the return to the fixed dial
             */

            /**
             * handles the end of a user dragging the handle, animates the handle returning to
             * resting position.
             *
             * @method _handleDragEnd
             * @protected
             */
            _handleDragEnd : function(){
                var node = this._handleNode;
                    node.transition({
                        duration: 0.08, // seconds
                        easing: 'ease-in',
                        left: this._setNodeToFixedRadius(this._handleNode, true)[0] + 'px',
                        top: this._setNodeToFixedRadius(this._handleNode, true)[1] + 'px'
                    }, Y.bind(function(){
                            var value = this.get('value');
                            //[#2530206] only hide marker if not at max or min
                            // more persistant user visibility of when the dial is at max or min
                            if((value > this._minValue) && (value < this._maxValue)){
                                this._markerNode.addClass(Dial.CSS_CLASSES.hidden);
                            }else{
                                this._setTimesWrappedFromValue(value);  //#2530766 secondary bug when drag past max + cross wrapping boundry
                                this._prevAng = this._getAngleFromValue(value); //#2530766 secondary bug when drag past max + cross wrapping boundry
                            }
                        }, this)
                    );
            },

            /**
             * returns the XY of the fixed position, handleDistance, from the center of the Dial (resting position).
             * The XY also represents the angle related to the current value.
             * If typeArray is true, [X,Y] is returned.
             * If typeArray is false, the XY of the obj node passed in is set.
             *
             * @method _setNodeToFixedRadius
             * @param obj {Node}
             * @param typeArray {Boolean} true returns an array [X,Y]
             * @protected
             * @return {Array} an array of [XY] is optionally returned
             */
             _setNodeToFixedRadius : function(obj, typeArray){
                var thisAngle = (this._angle - 90),
                rad = (Math.PI / 180),
                newY = Math.round(Math.sin(thisAngle * rad) * this._handleDistance),
                newX = Math.round(Math.cos(thisAngle * rad) * this._handleDistance),
                dia = obj.get('offsetWidth'); //Ticket #2529852

                newY = newY - (dia * 0.5);
                newX = newX - (dia * 0.5);
                if(typeArray){ // just need the style for css transform left and top to animate the handle drag:end
                    return [(this._ringNodeRadius + newX), (this._ringNodeRadius + newY)];
                }else{
                    obj.setStyle('left', (this._ringNodeRadius + newX) + 'px');
                    obj.setStyle('top', (this._ringNodeRadius + newY) + 'px');
                }
             },

            /**
             * Synchronizes the DOM state with the attribute settings.
             *
             * @method syncUI
             */
            syncUI : function() {
                // Make the marker and the resetString display so their placement and borderRadius can be calculated, then hide them again.
                // We would have used visibility:hidden in the css of this class,
                // but IE8 VML never returns to visible after applying visibility:hidden then removing it.
                this._setSizes();
                this._calculateDialCenter(); // #2531111 initialize center of dial
                this._setBorderRadius();
                this._uiSetValue(this.get("value"));
                this._markerNode.addClass(Dial.CSS_CLASSES.hidden);
                this._resetString.addClass(Dial.CSS_CLASSES.hidden);
            },

            /**
             * sets the sizes of ring, center-button, marker, handle, and VML ovals in pixels.
             * Needed only because some IE versions
             * ignore CSS percent sizes/offsets.
             * so these must be set in pixels.
             * Normally these are set in % of the ring.
             *
             * @method _setSizes
             * @protected
             */
            _setSizes : function(){
                var dia = this.get('diameter'),
                offset, offsetResetX, offsetResetY,
                setSize = function(node, dia, percent){
                    var suffix = 'px';
                    node.getElementsByTagName('oval').setStyle('width', (dia * percent) + suffix);
                    node.getElementsByTagName('oval').setStyle('height', (dia * percent) + suffix);
                    node.setStyle('width', (dia * percent) + suffix);
                    node.setStyle('height', (dia * percent) + suffix);
                };
                setSize(this._ringNode, dia, 1.0);
                setSize(this._handleNode, dia, this.get('handleDiameter'));
                setSize(this._markerNode, dia, this.get('markerDiameter'));
                setSize(this._centerButtonNode, dia, this.get('centerButtonDiameter'));

                // Set these (used for trig) this way instead of relative to dia,
                // in case they have borders, have images etc.
                this._ringNodeRadius = this._ringNode.get('offsetWidth') * 0.5;
                this._handleNodeRadius = this._handleNode.get('offsetWidth') * 0.5;
                this._markerNodeRadius = this._markerNode.get('offsetWidth') * 0.5;
                this._centerButtonNodeRadius = this._centerButtonNode.get('offsetWidth') * 0.5;
                this._handleDistance = this._ringNodeRadius * this.get('handleDistance');
                // place the centerButton
                offset = (this._ringNodeRadius - this._centerButtonNodeRadius);
                this._centerButtonNode.setStyle('left', offset + 'px');
                this._centerButtonNode.setStyle('top', offset + 'px');
                /*
                Place the resetString
                This seems like it should be able to be done with CSS,
                But since there is also a VML oval in IE that is absolute positioned,
                The resetString ends up behind the VML oval.
                */
                offsetResetX = (this._centerButtonNodeRadius - (this._resetString.get('offsetWidth') * 0.5));
                offsetResetY = (this._centerButtonNodeRadius - (this._resetString.get('offsetHeight') * 0.5));
                this._resetString.setStyles({'left':offsetResetX + 'px', 'top':offsetResetY + 'px'});
            },

            /**
             * renders the DOM object for the Dial's label
             *
             * @method _renderLabel
             * @protected
             */
            _renderLabel : function() {
                var contentBox = this.get("contentBox"),
                    label = contentBox.one("." + Dial.CSS_CLASSES.label);
                if (!label) {
                    label = Node.create(Y.Lang.sub(Dial.LABEL_TEMPLATE, this.get('strings')));
                    contentBox.append(label);
                }
                this._labelNode = label;
                this._valueStringNode = this._labelNode.one("." + Dial.CSS_CLASSES.valueString);
            },

            /**
             * renders the DOM object for the Dial's background ring
             *
             * @method _renderRing
             * @protected
             */
            _renderRing : function() {
                var contentBox = this.get("contentBox"),
                    ring = contentBox.one("." + Dial.CSS_CLASSES.ring);
                if (!ring) {
                    ring = contentBox.appendChild(Dial.RING_TEMPLATE);
                    ring.setStyles({width:this.get('diameter') + 'px', height:this.get('diameter') + 'px'});
                }
                this._ringNode = ring;
            },

            /**
             * renders the DOM object for the Dial's background marker which
             * tracks the angle of the user dragging the handle
             *
             * @method _renderMarker
             * @protected
             */
            _renderMarker : function() {
                var contentBox = this.get("contentBox"),
                marker = contentBox.one("." + Dial.CSS_CLASSES.marker);
                if (!marker) {
                    marker = contentBox.one('.' + Dial.CSS_CLASSES.ring).appendChild(Dial.MARKER_TEMPLATE);
                }
                this._markerNode = marker;
            },

            /**
             * renders the DOM object for the Dial's center
             *
             * @method _renderCenterButton
             * @protected
             */
            _renderCenterButton : function() {
                var contentBox = this.get("contentBox"),
                    centerButton = contentBox.one("." + Dial.CSS_CLASSES.centerButton);
                if (!centerButton) {
                    centerButton = Node.create(Y.Lang.sub(Dial.CENTER_BUTTON_TEMPLATE, this.get('strings')));
                    contentBox.one('.' + Dial.CSS_CLASSES.ring).append(centerButton);
                }
                this._centerButtonNode = centerButton;
                this._resetString = this._centerButtonNode.one('.' + Dial.CSS_CLASSES.resetString);
            },

            /**
             * renders the DOM object for the Dial's user draggable handle
             *
             * @method _renderHandle
             * @protected
             */
            _renderHandle : function() {
                var labelId = Dial.CSS_CLASSES.label + Y.guid(), //get this unique id once then use for handle and label for ARIA
                    contentBox = this.get("contentBox"),
                    handle = contentBox.one("." + Dial.CSS_CLASSES.handle);
                if (!handle) {
                    handle = Node.create(Y.Lang.sub(Dial.HANDLE_TEMPLATE, this.get('strings')));
                    handle.setAttribute('aria-labelledby', labelId);  // get unique id for specifying a label & handle for ARIA
                    this._labelNode.one('.' + Dial.CSS_CLASSES.labelString).setAttribute('id', labelId);  // When handle gets focus, screen reader will include label text when reading the value.
                    contentBox.one('.' + Dial.CSS_CLASSES.ring).append(handle);
                }
                this._handleNode = handle;
            },

            /**
             * sets the visible UI label HTML string
             *
             * @method _setLabelString
             * @param str {HTML}
             * @protected
             * @deprecated Use DialObjName.set('strings',{'label':'My new label'});   before DialObjName.render();

             */
            _setLabelString : function(str) {
                this.get("contentBox").one("." + Dial.CSS_CLASSES.labelString).setHTML(str);
            },

            /**
             * sets the visible UI label HTML string
             *
             * @method _setResetString
             * @param str {HTML}
             * @protected
             * @deprecated Use DialObjName.set('strings',{'resetStr':'My new reset string'});   before DialObjName.render();
             */
            _setResetString : function(str) {
                 this.get("contentBox").one("." + Dial.CSS_CLASSES.resetString).setHTML(str);
                // this._setXYResetString(); // This used to recenter the string in the button. Done with CSS now. Method has been removed.
                // this._resetString.setHTML(''); //We no longer show/hide the reset string with setHTML but by addClass and removeClass .yui3-dial-reset-string-hidden
            },

            /**
             * sets the tooltip HTML string in the Dial's handle
             *
             * @method _setTooltipString
             * @param str {HTML}
             * @protected
             * @deprecated Use DialObjName.set('strings',{'tooltipHandle':'My new tooltip'});   before DialObjName.render();
             */
            _setTooltipString : function(str) {
                this._handleNode.set('title', str);
            },

            /**
             * sets the Dial's value in response to key events.
             * Left and right keys are in a separate method
             * in case an implementation wants to increment values
             * but needs left and right arrow keys for other purposes.
             *
             * @method _onDirectionKey
             * @param e {Event} the key event
             * @protected
             */
            _onDirectionKey : function(e) {
                e.preventDefault();
                switch (e.charCode) {
                    case 38: // up
                        this._incrMinor();
                        break;
                    case 40: // down
                        this._decrMinor();
                        break;
                    case 36: // home
                        this._setToMin();
                        break;
                    case 35: // end
                        this._setToMax();
                        break;
                    case 33: // page up
                        this._incrMajor();
                        break;
                    case 34: // page down
                        this._decrMajor();
                        break;
                }
            },

            /**
             * sets the Dial's value in response to left or right key events
             *
             * @method _onLeftRightKey
             * @param e {Event} the key event
             * @protected
             */
            _onLeftRightKey : function(e) {
                e.preventDefault();
                switch (e.charCode) {
                    case 37: // left
                        this._decrMinor();
                        break;
                    case 39: // right
                        this._incrMinor();
                        break;
                }
            },

            /**
             * sets the Dial's value in response to left or right key events when a meta (mac command/apple) key is also pressed
             *
             * @method _onLeftRightKeyMeta
             * @param e {Event} the key event
             * @protected
             */
            _onLeftRightKeyMeta : function(e) {
                e.preventDefault();
                switch (e.charCode) {
                    case 37: // left + meta
                        this._setToMin();
                        break;
                    case 39: // right + meta
                        this._setToMax();
                        break;
                }
            },

            /**
             * increments Dial value by a minor increment
             *
             * @method _incrMinor
             * @protected
             */
            _incrMinor : function(){
                    var newVal = (this.get('value') + this.get("minorStep"));
                    newVal = Math.min(newVal, this.get("max"));
                    // [#2530045] .toFixed returns a string.
                    // Dial's value needs a number. -0 makes it a number, but removes trailing zeros.
                    // Added toFixed(...) again in _uiSetValue where content of yui3-dial-value-string is set.
                    // Removing the toFixed here, loses the feature of "snap-to" when for example, stepsPerRevolution is 10 and decimalPlaces is 0.
                    this.set('value', newVal.toFixed(this.get('decimalPlaces')) - 0);
            },

            /**
             * decrements Dial value by a minor increment
             *
             * @method _decrMinor
             * @protected
             */
            _decrMinor : function(){
                    var newVal = (this.get('value') - this.get("minorStep"));
                    newVal = Math.max(newVal, this.get("min"));
                    this.set('value', newVal.toFixed(this.get('decimalPlaces')) - 0);
            },

            /**
             * increments Dial value by a major increment
             *
             * @method _incrMajor
             * @protected
             */
            _incrMajor : function(){
                    var newVal = (this.get('value') + this.get("majorStep"));
                    newVal = Math.min(newVal, this.get("max"));
                    this.set('value', newVal.toFixed(this.get('decimalPlaces')) - 0);
            },

            /**
             * decrements Dial value by a major increment
             *
             * @method _decrMajor
             * @protected
             */
            _decrMajor : function(){
                    var newVal = (this.get('value') - this.get("majorStep"));
                    newVal = Math.max(newVal, this.get("min"));
                    this.set('value', newVal.toFixed(this.get('decimalPlaces')) - 0);
            },

            /**
             * sets Dial value to dial's max attr
             *
             * @method _setToMax
             * @protected
             */
            _setToMax : function(){
                    this.set('value', this.get("max"));
            },

            /**
             * sets Dial value to dial's min attr
             *
             * @method _setToMin
             * @protected
             */
            _setToMin : function(){
                    this.set('value', this.get("min"));
            },

            /**
             * resets Dial value to the orignal initial value.
             *
             * @method _resetDial
             * @protected
             */
            _resetDial : function(e){
                if(e){
                    e.stopPropagation(); //[#2530206] need to add so mousedown doesn't propagate to ring and move the handle
                }
                this.set('value', this._originalValue);
                this._resetString.addClass(Dial.CSS_CLASSES.hidden); //[#2530441]
                this._handleNode.focus();
            },

            /**
             * returns the handle angle associated with the current value of the Dial.
             * Returns a number between 0 and 360.
             *
             * @method _getAngleFromValue
             * @param newVal {Number} the current value of the Dial
             * @return {Number} the angle associated with the current Dial value
             * @protected
             */
            _getAngleFromValue : function(newVal){
                var nonWrappedPartOfValue = newVal % this._stepsPerRevolution,
                angleFromValue = nonWrappedPartOfValue / this._stepsPerRevolution * 360;
                return (angleFromValue < 0) ? (angleFromValue + 360) : angleFromValue;
            },

            /**
             * returns the value of the Dial calculated from the current handle angle
             *
             * @method _getValueFromAngle
             * @param angle {Number} the current angle of the Dial's handle
             * @return {Number} the current Dial value corresponding to the handle position
             * @protected
             */
            _getValueFromAngle : function(angle){
                if(angle < 0){
                    angle = (360 + angle);
                }else if(angle === 0){
                    angle = 360;
                }
                var value = (angle / 360) * this._stepsPerRevolution;
                value = (value + (this._timesWrapped * this._stepsPerRevolution));
                //return Math.round(value * 100) / 100;
                return value.toFixed(this.get('decimalPlaces')) - 0;
            },

            /**
             * calls the method to update the UI whenever the Dial value changes
             *
             * @method _afterValueChange
             * @param e {Event}
             * @protected
             */
            _afterValueChange : function(e) {
                this._uiSetValue(e.newVal);
            },

            /**
             * Changes a value to have the correct decimal places per the attribute decimalPlaces
             *
             * @method _valueToDecimalPlaces
             * @param val {Number} a raw value to set to the Dial
             * @return {Number} the input val changed to have the correct decimal places
             * @protected
             */
            _valueToDecimalPlaces : function(val) { // [#2530206] cleaned up and better user feedback of when it's max or min.

            },

            /**
             * Updates the UI display value of the Dial to reflect
             * the value passed in.
             * Makes all other needed UI display changes
             *
             * @method _uiSetValue
             * @param val {Number} value of the Dial
             * @protected
             */
            _uiSetValue : function(val) { // [#2530206] cleaned up and better user feedback of when it's max or min.
                this._angle = this._getAngleFromValue(val);
                if(this._handleNode.hasClass(Dial.CSS_CLASSES.dragging) === false){
                    this._setTimesWrappedFromValue(val);
                    this._setNodeToFixedRadius(this._handleNode, false);
                    this._prevAng = this._getAngleFromValue(this.get('value'));
                }
                this._valueStringNode.setHTML(val.toFixed(this.get('decimalPlaces'))); // [#2530045]
                this._handleNode.set('aria-valuenow', val);
                this._handleNode.set('aria-valuetext', val);
                this._setNodeToFixedRadius(this._markerNode, false);
                if((val === this._maxValue) || (val === this._minValue)){
                    this._markerNode.addClass(Dial.CSS_CLASSES.markerMaxMin);
                    if(supportsVML === true){
                        this._markerNode.getElementsByTagName('fill').set('color', '#AB3232');
                    }
                    this._markerNode.removeClass(Dial.CSS_CLASSES.hidden);
                }else{ // not max or min
                    if(supportsVML === true){
                        this._markerNode.getElementsByTagName('fill').set('color', '#000');
                    }
                    this._markerNode.removeClass(Dial.CSS_CLASSES.markerMaxMin);
                    if(this._handleNode.hasClass(Dial.CSS_CLASSES.dragging) === false){ // if not max || min, and not dragging handle, hide the marker
                        this._markerNode.addClass(Dial.CSS_CLASSES.hidden);
                    }
                }
            },

            /**
             * value attribute default validator. Verifies that
             * the value being set lies between the min/max value
             *
             * @method _validateValue
             * @param val {Number} value of the Dial
             * @protected
             */
            _validateValue: function(val) {
                var min = this.get("min"),
                    max = this.get("max");
                return (Lang.isNumber(val) && val >= min && val <= max);
            }
        });
        Y.Dial = Dial;