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YUI.add('scrollview-scrollbars', function (Y, NAME) {

/**
 * Provides a plugin, which adds support for a scroll indicator to ScrollView instances
 *
 * @module scrollview
 * @submodule scrollview-scrollbars
 */

var getClassName = Y.ClassNameManager.getClassName,
    _classNames,

Transition = Y.Transition,
    NATIVE_TRANSITIONS = Transition.useNative,
    SCROLLBAR = 'scrollbar',
    SCROLLVIEW = 'scrollview',

VERTICAL_NODE = "verticalNode",
    HORIZONTAL_NODE = "horizontalNode",

CHILD_CACHE = "childCache",

TOP = "top",
    LEFT = "left",
    WIDTH = "width",
    HEIGHT = "height",

HORIZ_CACHE = "_sbh",
    VERT_CACHE = "_sbv",

TRANSITION_PROPERTY = Y.ScrollView._TRANSITION.PROPERTY,
    TRANSFORM = "transform",

TRANSLATE_X = "translateX(",
    TRANSLATE_Y = "translateY(",

SCALE_X = "scaleX(",
    SCALE_Y = "scaleY(",

SCROLL_X = "scrollX",
    SCROLL_Y = "scrollY",

PX = "px",
    CLOSE = ")",
    PX_CLOSE = PX + CLOSE;

/**
 * ScrollView plugin that adds scroll indicators to ScrollView instances
 *
 * @class ScrollViewScrollbars
 * @namespace Plugin
 * @extends Plugin.Base
 * @constructor
 */
function ScrollbarsPlugin() {
    ScrollbarsPlugin.superclass.constructor.apply(this, arguments);
}

ScrollbarsPlugin.CLASS_NAMES = {
    showing: getClassName(SCROLLVIEW, SCROLLBAR, 'showing'),
    scrollbar: getClassName(SCROLLVIEW, SCROLLBAR),
    scrollbarV: getClassName(SCROLLVIEW, SCROLLBAR, 'vert'),
    scrollbarH: getClassName(SCROLLVIEW, SCROLLBAR, 'horiz'),
    scrollbarVB: getClassName(SCROLLVIEW, SCROLLBAR, 'vert', 'basic'),
    scrollbarHB: getClassName(SCROLLVIEW, SCROLLBAR, 'horiz', 'basic'),
    child: getClassName(SCROLLVIEW, 'child'),
    first: getClassName(SCROLLVIEW, 'first'),
    middle: getClassName(SCROLLVIEW, 'middle'),
    last: getClassName(SCROLLVIEW, 'last')
};

_classNames = ScrollbarsPlugin.CLASS_NAMES;

/**
 * The identity of the plugin
 *
 * @property NAME
 * @type String
 * @default 'pluginScrollViewScrollbars'
 * @static
 */
ScrollbarsPlugin.NAME = 'pluginScrollViewScrollbars';

/**
 * The namespace on which the plugin will reside.
 *
 * @property NS
 * @type String
 * @default 'scrollbars'
 * @static
 */
ScrollbarsPlugin.NS = 'scrollbars';

/**
 * HTML template for the scrollbar
 *
 * @property SCROLLBAR_TEMPLATE
 * @type Object
 * @static
 */
ScrollbarsPlugin.SCROLLBAR_TEMPLATE = [
    '<div>',
    '<span class="' + _classNames.child + ' ' + _classNames.first + '"></span>',
    '<span class="' + _classNames.child + ' ' + _classNames.middle + '"></span>',
    '<span class="' + _classNames.child + ' ' + _classNames.last + '"></span>',
    '</div>'
].join('');

/**
 * The default attribute configuration for the plugin
 *
 * @property ATTRS
 * @type Object
 * @static
 */
ScrollbarsPlugin.ATTRS = {

/**
     * Vertical scrollbar node
     *
     * @attribute verticalNode
     * @type Y.Node
     */
    verticalNode: {
        setter: '_setNode',
        valueFn: '_defaultNode'
    },

/**
     * Horizontal scrollbar node
     *
     * @attribute horizontalNode
     * @type Y.Node
     */
    horizontalNode: {
        setter: '_setNode',
        valueFn: '_defaultNode'
    }
};

Y.namespace("Plugin").ScrollViewScrollbars = Y.extend(ScrollbarsPlugin, Y.Plugin.Base, {

/**
     * Designated initializer
     *
     * @method initializer
     */
    initializer: function() {
        this._host = this.get("host");

this.afterHostEvent('scrollEnd', this._hostScrollEnd);
        this.afterHostMethod('scrollTo', this._update);
        this.afterHostMethod('_uiDimensionsChange', this._hostDimensionsChange);
    },

/**
     * Set up the DOM nodes for the scrollbars. This method is invoked whenever the
     * host's _uiDimensionsChange fires, giving us the opportunity to remove un-needed
     * scrollbars, as well as add one if necessary.
     *
     * @method _hostDimensionsChange
     * @protected
     */
    _hostDimensionsChange: function() {
        var host = this._host,
            axis = host._cAxis,
            scrollX = host.get(SCROLL_X),
            scrollY = host.get(SCROLL_Y);

this._dims = host._getScrollDims();

if (axis && axis.y) {
            this._renderBar(this.get(VERTICAL_NODE), true, 'vert');
        }

if (axis && axis.x) {
            this._renderBar(this.get(HORIZONTAL_NODE), true, 'horiz');
        }

this._update(scrollX, scrollY);

Y.later(500, this, 'flash', true);
    },

/**
     * Handler for the scrollEnd event fired by the host. Default implementation flashes the scrollbar
     *
     * @method _hostScrollEnd
     * @param {EventFacade} e The event facade.
     * @protected
     */
    _hostScrollEnd : function() {
        var host = this._host,
            scrollX = host.get(SCROLL_X),
            scrollY = host.get(SCROLL_Y);

this.flash();

this._update(scrollX, scrollY);
    },

/**
     * Adds or removes a scrollbar node from the document.
     *
     * @method _renderBar
     * @private
     * @param {Node} bar The scrollbar node
     * @param {boolean} add true, to add the node, false to remove it
     */
    _renderBar: function(bar, add) {
        var inDoc = bar.inDoc(),
            bb = this._host._bb,
            className = bar.getData("isHoriz") ? _classNames.scrollbarHB : _classNames.scrollbarVB;

if (add && !inDoc) {
            bb.append(bar);
            bar.toggleClass(className, this._basic);
            this._setChildCache(bar);
        } else if(!add && inDoc) {
            bar.remove();
            this._clearChildCache(bar);
        }
    },

/**
     * Caches scrollbar child element information,
     * to optimize _update implementation
     *
     * @method _setChildCache
     * @private
     * @param {Node} node
     */
    _setChildCache : function(node) {
        var c = node.get("children"),
            fc = c.item(0),
            mc = c.item(1),
            lc = c.item(2),
            size = node.getData("isHoriz") ? "offsetWidth" : "offsetHeight";

node.setStyle(TRANSITION_PROPERTY, TRANSFORM);
        mc.setStyle(TRANSITION_PROPERTY, TRANSFORM);
        lc.setStyle(TRANSITION_PROPERTY, TRANSFORM);

node.setData(CHILD_CACHE, {
            fc : fc,
            lc : lc,
            mc : mc,
            fcSize : fc && fc.get(size),
            lcSize : lc && lc.get(size)
        });
    },

/**
     * Clears child cache
     *
     * @method _clearChildCache
     * @private
     * @param {Node} node
     */
    _clearChildCache : function(node) {
        node.clearData(CHILD_CACHE);
    },

/**
     * Utility method, to move/resize either vertical or horizontal scrollbars
     *
     * @method _updateBar
     * @private
     *
     * @param {Node} scrollbar The scrollbar node.
     * @param {Number} current The current scroll position.
     * @param {Number} duration The transition duration.
     * @param {boolean} horiz true if horizontal, false if vertical.
     */
    _updateBar : function(scrollbar, current, duration, horiz) {

var host = this._host,
            basic = this._basic,

scrollbarSize = 0,
            scrollbarPos = 1,

childCache = scrollbar.getData(CHILD_CACHE),
            lastChild = childCache.lc,
            middleChild = childCache.mc,
            firstChildSize = childCache.fcSize,
            lastChildSize = childCache.lcSize,
            middleChildSize,
            lastChildPosition,

transition,
            translate,
            scale,

dim,
            dimOffset,
            dimCache,
            widgetSize,
            contentSize;

if (horiz) {
            dim = WIDTH;
            dimOffset = LEFT;
            dimCache = HORIZ_CACHE;
            widgetSize = this._dims.offsetWidth;
            contentSize = this._dims.scrollWidth;
            translate = TRANSLATE_X;
            scale = SCALE_X;
            current = (current !== undefined) ? current : host.get(SCROLL_X);
        } else {
            dim = HEIGHT;
            dimOffset = TOP;
            dimCache = VERT_CACHE;
            widgetSize = this._dims.offsetHeight;
            contentSize = this._dims.scrollHeight;
            translate = TRANSLATE_Y;
            scale = SCALE_Y;
            current = (current !== undefined) ? current : host.get(SCROLL_Y);
        }

scrollbarSize = Math.floor(widgetSize * (widgetSize/contentSize));
        scrollbarPos = Math.floor((current/(contentSize - widgetSize)) * (widgetSize - scrollbarSize));
        if (scrollbarSize > widgetSize) {
            scrollbarSize = 1;
        }

if (scrollbarPos > (widgetSize - scrollbarSize)) {
            scrollbarSize = scrollbarSize - (scrollbarPos - (widgetSize - scrollbarSize));
        } else if (scrollbarPos < 0) {
            scrollbarSize = scrollbarPos + scrollbarSize;
            scrollbarPos = 0;
        } else if (isNaN(scrollbarPos)) {
            scrollbarPos = 0;
        }

middleChildSize = (scrollbarSize - (firstChildSize + lastChildSize));

if (middleChildSize < 0) {
            middleChildSize = 0;
        }

if (middleChildSize === 0 && scrollbarPos !== 0) {
            scrollbarPos = widgetSize - (firstChildSize + lastChildSize) - 1;
        }

if (duration !== 0) {
            // Position Scrollbar
            transition = {
                duration : duration
            };

if (NATIVE_TRANSITIONS) {
                transition.transform = translate + scrollbarPos + PX_CLOSE;
            } else {
                transition[dimOffset] = scrollbarPos + PX;
            }

scrollbar.transition(transition);

} else {
            if (NATIVE_TRANSITIONS) {
                scrollbar.setStyle(TRANSFORM, translate + scrollbarPos + PX_CLOSE);
            } else {
                scrollbar.setStyle(dimOffset, scrollbarPos + PX);
            }
        }

// Resize Scrollbar Middle Child
        if (this[dimCache] !== middleChildSize) {
            this[dimCache] = middleChildSize;

if (middleChildSize > 0) {

if (duration !== 0) {
                    transition = {
                        duration : duration
                    };

if(NATIVE_TRANSITIONS) {
                        transition.transform = scale + middleChildSize + CLOSE;
                    } else {
                        transition[dim] = middleChildSize + PX;
                    }

middleChild.transition(transition);
                } else {
                    if (NATIVE_TRANSITIONS) {
                        middleChild.setStyle(TRANSFORM, scale + middleChildSize + CLOSE);
                    } else {
                        middleChild.setStyle(dim, middleChildSize + PX);
                    }
                }

// Position Last Child
                if (!horiz || !basic) {

lastChildPosition = scrollbarSize - lastChildSize;

if(duration !== 0) {
                        transition = {
                            duration : duration
                        };

if (NATIVE_TRANSITIONS) {
                            transition.transform = translate + lastChildPosition + PX_CLOSE;
                        } else {
                            transition[dimOffset] = lastChildPosition;
                        }

lastChild.transition(transition);
                    } else {
                        if (NATIVE_TRANSITIONS) {
                            lastChild.setStyle(TRANSFORM, translate + lastChildPosition + PX_CLOSE);
                        } else {
                            lastChild.setStyle(dimOffset, lastChildPosition + PX);
                        }
                    }
                }
            }
        }
    },

/**
     * AOP method, invoked after the host's _uiScrollTo method,
     *  to position and resize the scroll bars
     *
     * @method _update
     * @param x {Number} The current scrollX value
     * @param y {Number} The current scrollY value
     * @param duration {Number} Number of ms of animation (optional) - used when snapping to bounds
     * @param easing {String} Optional easing equation to use during the animation, if duration is set
     * @protected
     */
    _update: function(x, y, duration) {
        var vNode = this.get(VERTICAL_NODE),
            hNode = this.get(HORIZONTAL_NODE),
            host = this._host,
            axis = host._cAxis;

duration = (duration || 0)/1000;

if (!this._showing) {
            this.show();
        }

if (axis && axis.y && vNode && y !== null) {
            this._updateBar(vNode, y, duration, false);
        }

if (axis && axis.x && hNode && x !== null) {
            this._updateBar(hNode, x, duration, true);
        }
    },

/**
     * Show the scroll bar indicators
     *
     * @method show
     * @param animated {Boolean} Whether or not to animate the showing
     */
    show: function(animated) {
        this._show(true, animated);
    },

/**
     * Hide the scroll bar indicators
     *
     * @method hide
     * @param animated {Boolean} Whether or not to animate the hiding
     */
    hide: function(animated) {
        this._show(false, animated);
    },

/**
     * Internal hide/show implementation utility method
     *
     * @method _show
     * @param {boolean} show Whether to show or hide the scrollbar
     * @param {bolean} animated Whether or not to animate while showing/hide
     * @protected
     */
    _show : function(show, animated) {

var verticalNode = this.get(VERTICAL_NODE),
            horizontalNode = this.get(HORIZONTAL_NODE),

duration = (animated) ? 0.6 : 0,
            opacity = (show) ? 1 : 0,

transition;

this._showing = show;

if (this._flashTimer) {
            this._flashTimer.cancel();
        }

transition = {
            duration : duration,
            opacity : opacity
        };

if (verticalNode && verticalNode._node) {
            verticalNode.transition(transition);
        }

if (horizontalNode && horizontalNode._node) {
            horizontalNode.transition(transition);
        }
    },

/**
     * Momentarily flash the scroll bars to indicate current scroll position
     *
     * @method flash
     */
    flash: function() {
        this.show(true);
        this._flashTimer = Y.later(800, this, 'hide', true);
    },

/**
     * Setter for the verticalNode and horizontalNode attributes
     *
     * @method _setNode
     * @param node {Node} The Y.Node instance for the scrollbar
     * @param name {String} The attribute name
     * @return {Node} The Y.Node instance for the scrollbar
     *
     * @protected
     */
    _setNode: function(node, name) {
        var horiz = (name === HORIZONTAL_NODE);
            node = Y.one(node);

if (node) {
            node.addClass(_classNames.scrollbar);
            node.addClass( (horiz) ? _classNames.scrollbarH : _classNames.scrollbarV );
            node.setData("isHoriz", horiz);
        }

return node;
    },

/**
     * Creates default node instances for scrollbars
     *
     * @method _defaultNode
     * @return {Node} The Y.Node instance for the scrollbar
     *
     * @protected
     */
    _defaultNode: function() {
        return Y.Node.create(ScrollbarsPlugin.SCROLLBAR_TEMPLATE);
    },

_basic: Y.UA.ie && Y.UA.ie <= 8

});

}, '3.18.1', {"requires": ["classnamemanager", "transition", "plugin"], "skinnable": true});

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