/**
 * @class Ext.view.AbstractView
 * This is an abstract superclass and should not be used directly. Please see {@link Ext.view.View}.
 * @private
 */
Ext.define('Ext.view.AbstractView', {
    extend: 'Ext.Component',
    requires: [
        'Ext.LoadMask',
        'Ext.data.StoreManager',
        'Ext.CompositeElementLite',
        'Ext.DomQuery',
        'Ext.selection.DataViewModel'
    ],
    mixins: {
        bindable: 'Ext.util.Bindable'
    },

    inheritableStatics: {
        getRecord: function(node) {
            return this.getBoundView(node).getRecord(node);
        },

        getBoundView: function(node) {
            return Ext.getCmp(node.boundView);
        }
    },

    /**
     * @cfg {String/String[]/Ext.XTemplate} tpl (required)
     * The HTML fragment or an array of fragments that will make up the template used by this DataView.  This should
     * be specified in the same format expected by the constructor of {@link Ext.XTemplate}.
     */
    /**
     * @cfg {Ext.data.Store} store (required)
     * The {@link Ext.data.Store} to bind this DataView to.
     */

    /**
     * @cfg {Boolean} deferInitialRefresh
     * <p>Defaults to <code>true</code> to defer the initial refresh of the view.</p>
     * <p>This allows the View to execute its render and initial layout more quickly because the process will not be encumbered
     * by the expensive update of the view structure.</p>
     * <p><b>Important: </b>Be aware that this will mean that the View's item elements will not be available immediately upon render, so
     * <i>selection</i> may not take place at render time. To access a View's item elements as soon as possible, use the {@link #viewready} event.
     * Or set <code>deferInitialrefresh</code> to false, but this will be at the cost of slower rendering.</p>
     */
    deferInitialRefresh: true,

    /**
     * @cfg {String} itemSelector (required)
     * <b>This is a required setting</b>. A simple CSS selector (e.g. <tt>div.some-class</tt> or
     * <tt>span:first-child</tt>) that will be used to determine what nodes this DataView will be
     * working with. The itemSelector is used to map DOM nodes to records. As such, there should
     * only be one root level element that matches the selector for each record.
     */

    /**
     * @cfg {String} itemCls
     * Specifies the class to be assigned to each element in the view when used in conjunction with the
     * {@link #itemTpl} configuration.
     */
    itemCls: Ext.baseCSSPrefix + 'dataview-item',

    /**
     * @cfg {String/String[]/Ext.XTemplate} itemTpl
     * The inner portion of the item template to be rendered. Follows an XTemplate
     * structure and will be placed inside of a tpl.
     */

    /**
     * @cfg {String} overItemCls
     * A CSS class to apply to each item in the view on mouseover.
     * Setting this will automatically set {@link #trackOver} to `true`.
     */

    //<locale>
    /**
     * @cfg {String} loadingText
     * A string to display during data load operations.  If specified, this text will be
     * displayed in a loading div and the view's contents will be cleared while loading, otherwise the view's
     * contents will continue to display normally until the new data is loaded and the contents are replaced.
     */
    loadingText: 'Loading...',
    //</locale>

    /**
     * @cfg {Boolean/Object} loadMask
     * False to disable a load mask from displaying while the view is loading. This can also be a
     * {@link Ext.LoadMask} configuration object.
     */
    loadMask: true,

    /**
     * @cfg {String} loadingCls
     * The CSS class to apply to the loading message element. Defaults to Ext.LoadMask.prototype.msgCls "x-mask-loading".
     */

    /**
     * @cfg {Boolean} loadingUseMsg
     * Whether or not to use the loading message.
     * @private
     */
    loadingUseMsg: true,


    /**
     * @cfg {Number} loadingHeight
     * If specified, gives an explicit height for the data view when it is showing the {@link #loadingText},
     * if that is specified. This is useful to prevent the view's height from collapsing to zero when the
     * loading mask is applied and there are no other contents in the data view.
     */

    /**
     * @cfg {String} selectedItemCls
     * A CSS class to apply to each selected item in the view.
     */
    selectedItemCls: Ext.baseCSSPrefix + 'item-selected',

    //<locale>
    /**
     * @cfg {String} emptyText
     * The text to display in the view when there is no data to display.
     * Note that when using local data the emptyText will not be displayed unless you set
     * the {@link #deferEmptyText} option to false.
     */
    emptyText: "",
    //</locale>

    /**
     * @cfg {Boolean} deferEmptyText
     * True to defer emptyText being applied until the store's first load.
     */
    deferEmptyText: true,

    /**
     * @cfg {Boolean} trackOver
     * When `true` the {@link #overItemCls} will be applied to rows when hovered over.
     * This in return will also cause {@link Ext.view.View#highlightitem highlightitem} and
     * {@link Ext.view.View#unhighlightitem unhighlightitem} events to be fired.
     *
     * Enabled automatically when the {@link #overItemCls} config is set.
     */
    trackOver: false,

    /**
     * @cfg {Boolean} blockRefresh
     * Set this to true to ignore refresh events on the bound store. This is useful if
     * you wish to provide custom transition animations via a plugin
     */
    blockRefresh: false,

    /**
     * @cfg {Boolean} disableSelection
     * True to disable selection within the DataView. This configuration will lock the selection model
     * that the DataView uses.
     */

    /**
     * @cfg {Boolean} preserveScrollOnRefresh=false
     * True to preserve scroll position across refresh operations.
     */
    preserveScrollOnRefresh: false,

    //private
    last: false,

    triggerEvent: 'itemclick',
    triggerCtEvent: 'containerclick',

    addCmpEvents: function() {

    },

    // private
    initComponent : function(){
        var me = this,
            isDef = Ext.isDefined,
            itemTpl = me.itemTpl,
            memberFn = {};

        if (itemTpl) {
            if (Ext.isArray(itemTpl)) {
                // string array
                itemTpl = itemTpl.join('');
            } else if (Ext.isObject(itemTpl)) {
                // tpl instance
                memberFn = Ext.apply(memberFn, itemTpl.initialConfig);
                itemTpl = itemTpl.html;
            }

            if (!me.itemSelector) {
                me.itemSelector = '.' + me.itemCls;
            }

            itemTpl = Ext.String.format('<tpl for="."><div class="{0}">{1}</div></tpl>', me.itemCls, itemTpl);
            me.tpl = new Ext.XTemplate(itemTpl, memberFn);
        }

        //<debug>
        if (!isDef(me.tpl) || !isDef(me.itemSelector)) {
            Ext.Error.raise({
                sourceClass: 'Ext.view.View',
                tpl: me.tpl,
                itemSelector: me.itemSelector,
                msg: "DataView requires both tpl and itemSelector configurations to be defined."
            });
        }
        //</debug>

        me.callParent();
        if(Ext.isString(me.tpl) || Ext.isArray(me.tpl)){
            me.tpl = new Ext.XTemplate(me.tpl);
        }

        //<debug>
        // backwards compat alias for overClass/selectedClass
        // TODO: Consider support for overCls generation Ext.Component config
        if (isDef(me.overCls) || isDef(me.overClass)) {
            if (Ext.isDefined(Ext.global.console)) {
                Ext.global.console.warn('Ext.view.View: Using the deprecated overCls or overClass configuration. Use overItemCls instead.');
            }
            me.overItemCls = me.overCls || me.overClass;
            delete me.overCls;
            delete me.overClass;
        }

        if (me.overItemCls) {
            me.trackOver = true;
        }

        if (isDef(me.selectedCls) || isDef(me.selectedClass)) {
            if (Ext.isDefined(Ext.global.console)) {
                Ext.global.console.warn('Ext.view.View: Using the deprecated selectedCls or selectedClass configuration. Use selectedItemCls instead.');
            }
            me.selectedItemCls = me.selectedCls || me.selectedClass;
            delete me.selectedCls;
            delete me.selectedClass;
        }
        //</debug>

        me.addEvents(
            /**
             * @event beforerefresh
             * Fires before the view is refreshed
             * @param {Ext.view.View} this The DataView object
             */
            'beforerefresh',
            /**
             * @event refresh
             * Fires when the view is refreshed
             * @param {Ext.view.View} this The DataView object
             */
            'refresh',
            /**
             * @event viewready
             * Fires when the View's item elements representing Store items has been rendered. If the {@link #deferInitialRefresh} flag
             * was set (and it is <code>true</code> by default), this will be <b>after</b> initial render, and no items will be available
             * for selection until this event fires.
             * @param {Ext.view.View} this
             */
            'viewready',
            /**
             * @event itemupdate
             * Fires when the node associated with an individual record is updated
             * @param {Ext.data.Model} record The model instance
             * @param {Number} index The index of the record/node
             * @param {HTMLElement} node The node that has just been updated
             */
            'itemupdate',
            /**
             * @event itemadd
             * Fires when the nodes associated with an recordset have been added to the underlying store
             * @param {Ext.data.Model[]} records The model instance
             * @param {Number} index The index at which the set of record/nodes starts
             * @param {HTMLElement[]} node The node that has just been updated
             */
            'itemadd',
            /**
             * @event itemremove
             * Fires when the node associated with an individual record is removed
             * @param {Ext.data.Model} record The model instance
             * @param {Number} index The index of the record/node
             */
            'itemremove'
        );

        me.addCmpEvents();

        // Look up the configured Store. If none configured, use the fieldless, empty Store defined in Ext.data.Store.
        me.store = Ext.data.StoreManager.lookup(me.store || 'ext-empty-store');
        me.bindStore(me.store, true);
        me.all = new Ext.CompositeElementLite();

        // We track the scroll position
        me.scrollState = {
            top: 0,
            left: 0
        };
        me.on({
            scroll: me.onViewScroll,
            element: 'el',
            scope: me
        });
    },

    onRender: function() {
        var me = this,
            mask = me.loadMask,
            cfg = {
                msg: me.loadingText,
                msgCls: me.loadingCls,
                useMsg: me.loadingUseMsg,
                // The store gets bound in initComponent, so while
                // rendering let's push on the store
                store: me.getMaskStore()
            };

        me.callParent(arguments);

        if (mask) {
            // either a config object 
            if (Ext.isObject(mask)) {
                cfg = Ext.apply(cfg, mask);
            }
            // Attach the LoadMask to a *Component* so that it can be sensitive to resizing during long loads.
            // If this DataView is floating, then mask this DataView.
            // Otherwise, mask its owning Container (or this, if there *is* no owning Container).
            // LoadMask captures the element upon render.
            me.loadMask = new Ext.LoadMask(me, cfg);
            me.loadMask.on({
                scope: me,
                beforeshow: me.onMaskBeforeShow,
                hide: me.onMaskHide
            });
        }
    },
    
    finishRender: function(){
        var me = this;
        me.callParent(arguments);
        // Kick off the refresh before layouts are resumed after the render 
        // completes, but after afterrender is fired on the view
        if (!me.up('[collapsed],[hidden]')) {
            me.doFirstRefresh(me.store);
        }
    },

    onBoxReady: function() {
        var me = this;

        me.callParent(arguments);

        // If the refresh was not kicked off on render due to a collapsed or hidden ancestor,
        // kick it off as soon as we get layed out
        if (!me.firstRefreshDone) {
            me.doFirstRefresh(me.store);
        }
    },
    
    getMaskStore: function(){
        return this.store;    
    },
    
    onMaskBeforeShow: function(){
        var me = this,
            loadingHeight = me.loadingHeight;

        me.getSelectionModel().deselectAll();
        me.all.clear();
        if (loadingHeight && loadingHeight > me.getHeight()) {
            me.hasLoadingHeight = true;
            me.oldMinHeight = me.minHeight;
            me.minHeight = loadingHeight;
            me.updateLayout();
        }
    },

    onMaskHide: function(){
        var me = this;

        if (!me.destroying && me.hasLoadingHeight) {
            me.minHeight = me.oldMinHeight;
            me.updateLayout();
            delete me.hasLoadingHeight;
        }
    },

    beforeRender: function() {
        this.callParent(arguments);
        this.getSelectionModel().beforeViewRender(this);
    },

    afterRender: function() {
        this.callParent(arguments);

        // Init the SelectionModel after any on('render') listeners have been added.
        // Drag plugins create a DragDrop instance in a render listener, and that needs
        // to see an itemmousedown event first.
        this.getSelectionModel().bindComponent(this);
    },

    /**
     * Gets the selection model for this view.
     * @return {Ext.selection.Model} The selection model
     */
    getSelectionModel: function(){
        var me = this,
            mode = 'SINGLE';

        if (!me.selModel) {
            me.selModel = {};
        }

        if (me.simpleSelect) {
            mode = 'SIMPLE';
        } else if (me.multiSelect) {
            mode = 'MULTI';
        }

        Ext.applyIf(me.selModel, {
            allowDeselect: me.allowDeselect,
            mode: mode
        });

        if (!me.selModel.events) {
            me.selModel = new Ext.selection.DataViewModel(me.selModel);
        }

        if (!me.selModel.hasRelaySetup) {
            me.relayEvents(me.selModel, [
                'selectionchange', 'beforeselect', 'beforedeselect', 'select', 'deselect', 'focuschange'
            ]);
            me.selModel.hasRelaySetup = true;
        }

        // lock the selection model if user
        // has disabled selection
        if (me.disableSelection) {
            me.selModel.locked = true;
        }

        return me.selModel;
    },

    /**
     * Refreshes the view by reloading the data from the store and re-rendering the template.
     */
    refresh: function() {
        var me = this,
            targetEl,
            targetParent,
            oldDisplay,
            nextSibling,
            dom,
            records;

        if (!me.rendered || me.isDestroyed) {
            return;
        }

        if (!me.hasListeners.beforerefresh || me.fireEvent('beforerefresh', me) !== false) {
            targetEl = me.getTargetEl();
            records = me.store.getRange();
            dom = targetEl.dom;

            // Updating is much quicker if done when the targetEl is detached from the document, and not displayed.
            // But this resets the scroll position, so when preserving scroll position, this cannot be done.
            if (!me.preserveScrollOnRefresh) {
                targetParent = dom.parentNode;
                oldDisplay = dom.style.display;
                dom.style.display = 'none';
                nextSibling = dom.nextSibling;
                targetParent.removeChild(dom);
            }

            if (me.refreshCounter) {
                me.clearViewEl();
            } else {
                me.fixedNodes = targetEl.dom.childNodes.length;
                me.refreshCounter = 1;
            }

            // Always attempt to create the required markup after the fixedNodes.
            // Usually, for an empty record set, this would be blank, but when the Template
            // Creates markup outside of the record loop, this must still be honoured even if there are no
            // records.
            me.tpl.append(targetEl, me.collectData(records, 0));

            // The emptyText is now appended to the View's element
            // after any fixedNodes.
            if (records.length < 1) {
                if (!me.deferEmptyText || me.hasSkippedEmptyText) {
                    Ext.core.DomHelper.insertHtml('beforeEnd', targetEl.dom, me.emptyText);
                }
                me.all.clear();
            } else {
                me.all.fill(Ext.query(me.getItemSelector(), targetEl.dom));
                me.updateIndexes(0);
            }

            me.selModel.refresh();
            me.hasSkippedEmptyText = true;

            if (!me.preserveScrollOnRefresh) {
                targetParent.insertBefore(dom, nextSibling);
                dom.style.display = oldDisplay;
            }

            // Ensure layout system knows about new content size
            this.refreshSize();

            me.fireEvent('refresh', me);

            // Upon first refresh, fire the viewready event.
            // Reconfiguring the grid "renews" this event.
            if (!me.viewReady) {
                // Fire an event when deferred content becomes available.
                // This supports grid Panel's deferRowRender capability
                me.viewReady = true;
                me.fireEvent('viewready', me);
            }
        }
    },

    /**
     * @private
     * Called by the framework when the view is refreshed, or when rows are added or deleted.
     * 
     * These operations may cause the view's dimensions to change, and if the owning container
     * is shrinkwrapping this view, then the layout must be updated to accommodate these new dimensions.
     */
    refreshSize: function() {
        var sizeModel = this.getSizeModel();
        if (sizeModel.height.shrinkWrap || sizeModel.width.shrinkWrap) {
            this.updateLayout();
        }
    },

    clearViewEl: function(){
        // The purpose of this is to allow boilerplate HTML nodes to remain in place inside a View
        // while the transient, templated data can be discarded and recreated.
        // The first time through this code, we take a count of the number of existing child nodes.
        // Subsequent refreshes then do not clear the entire element, but remove all nodes
        // *after* the fixedNodes count.
        // In particular, this is used in infinite grid scrolling: A very tall "stretcher" element is
        // inserted into the View's element to create a scrollbar of the correct proportion.

        var me = this,
            el = me.getTargetEl();

        if (me.fixedNodes) {
            while (el.dom.childNodes[me.fixedNodes]) {
                el.dom.removeChild(el.dom.childNodes[me.fixedNodes]);
            }
        } else {
            el.update('');
        }
        me.refreshCounter++;
    },

    // Private template method to be overridden in subclasses.
    onViewScroll: Ext.emptyFn,

    /**
     * Saves the scrollState in a private variable. Must be used in conjunction with restoreScrollState.
     * @private
     */
    saveScrollState: function() {
        if (this.rendered) {
            var dom = this.el.dom,
                state = this.scrollState;

            state.left = dom.scrollLeft;
            state.top = dom.scrollTop;
        }
    },

    /**
     * Restores the scrollState.
     * Must be used in conjunction with saveScrollState
     * @private
     */
    restoreScrollState: function() {
        if (this.rendered) {
            var dom = this.el.dom, 
                state = this.scrollState;

            dom.scrollLeft = state.left;
            dom.scrollTop = state.top;
        }
    },

    /**
     * Function which can be overridden to provide custom formatting for each Record that is used by this
     * DataView's {@link #tpl template} to render each node.
     * @param {Object/Object[]} data The raw data object that was used to create the Record.
     * @param {Number} recordIndex the index number of the Record being prepared for rendering.
     * @param {Ext.data.Model} record The Record being prepared for rendering.
     * @return {Array/Object} The formatted data in a format expected by the internal {@link #tpl template}'s overwrite() method.
     * (either an array if your params are numeric (i.e. {0}) or an object (i.e. {foo: 'bar'}))
     */
    prepareData: function(data, index, record) {
        var associatedData, attr;
        if (record) {
            associatedData = record.getAssociatedData();
            for (attr in associatedData) {
                if (associatedData.hasOwnProperty(attr)) {
                    data[attr] = associatedData[attr];
                }
            }
        }
        return data;
    },

    /**
     * <p>Function which can be overridden which returns the data object passed to this
     * DataView's {@link #tpl template} to render the whole DataView.</p>
     * <p>This is usually an Array of data objects, each element of which is processed by an
     * {@link Ext.XTemplate XTemplate} which uses <tt>'&lt;tpl for="."&gt;'</tt> to iterate over its supplied
     * data object as an Array. However, <i>named</i> properties may be placed into the data object to
     * provide non-repeating data such as headings, totals etc.</p>
     * @param {Ext.data.Model[]} records An Array of {@link Ext.data.Model}s to be rendered into the DataView.
     * @param {Number} startIndex the index number of the Record being prepared for rendering.
     * @return {Object[]} An Array of data objects to be processed by a repeating XTemplate. May also
     * contain <i>named</i> properties.
     */
    collectData : function(records, startIndex){
        var data = [],
            i = 0,
            len = records.length,
            record;

        for (; i < len; i++) {
            record = records[i];
            data[i] = this.prepareData(record.data, startIndex + i, record);
        }
        return data;
    },

    // private
    bufferRender : function(records, index){
        var me = this,
            div = me.renderBuffer || (me.renderBuffer = document.createElement('div'));

        me.tpl.overwrite(div, me.collectData(records, index));
        return Ext.query(me.getItemSelector(), div);
    },

    // private
    onUpdate : function(ds, record){
        var me = this,
            index,
            node;

        if (me.viewReady) {
            index = me.store.indexOf(record);
            if (index > -1) {
                node = me.bufferRender([record], index)[0];
                // ensure the node actually exists in the DOM
                if (me.getNode(record)) {
                    me.all.replaceElement(index, node, true);
                    me.updateIndexes(index, index);
                    // Maintain selection after update
                    // TODO: Move to approriate event handler.
                    me.selModel.refresh();
                    if (me.hasListeners.itemupdate) {
                        me.fireEvent('itemupdate', record, index, node);
                    }
                    return node;
                }
            }
        }

    },

    // private
    onAdd : function(ds, records, index) {
        var me = this,
            nodes;

        if (me.rendered) {
            // If we are adding into an empty view, we must refresh in order that the *full tpl* is applied
            // which might create boilerplate content *around* the record nodes.
            if (me.all.getCount() === 0) {
                me.refresh();
                return;
            }

            nodes = me.bufferRender(records, index);
            me.doAdd(nodes, records, index);

            me.selModel.refresh();
            me.updateIndexes(index);

            // Ensure layout system knows about new content size
            me.refreshSize();

            if (me.hasListeners.itemadd) {
                me.fireEvent('itemadd', records, index, nodes);
            }
        }

    },

    doAdd: function(nodes, records, index) {
        var all = this.all,
            count = all.getCount();

        if (count === 0) {
            this.clearViewEl();
            this.getTargetEl().appendChild(nodes);
        } else if (index < count) {
            if (index === 0) {
                all.item(index).insertSibling(nodes, 'before', true);
            } else {
                all.item(index - 1).insertSibling(nodes, 'after', true);
            }
        } else {
            all.last().insertSibling(nodes, 'after', true);
        }

        Ext.Array.insert(all.elements, index, nodes);
    },

    // private
    onRemove : function(ds, record, index) {
        var me = this;

        if (me.all.getCount()) {
            if (me.store.getCount() === 0) {
                // Refresh so emptyText can be applied if necessary
                me.refresh();
            } else {
                // Just remove the element which corresponds to the removed record
                // The tpl's full HTML will still be in place.
                me.doRemove(record, index);
                if (me.selModel.refreshOnRemove) {
                    me.selModel.refresh();
                }
                me.updateIndexes(index);
            }

            // Ensure layout system knows about new content height
            this.refreshSize();

            if (me.hasListeners.itemremove) {
                me.fireEvent('itemremove', record, index);
            }
        }
    },

    doRemove: function(record, index) {
        this.all.removeElement(index, true);
    },

    /**
     * Refreshes an individual node's data from the store.
     * @param {Number} index The item's data index in the store
     */
    refreshNode : function(index){
        this.onUpdate(this.store, this.store.getAt(index));
    },

    // private
    updateIndexes : function(startIndex, endIndex) {
        var ns = this.all.elements,
            records = this.store.getRange(),
            i;

        startIndex = startIndex || 0;
        endIndex = endIndex || ((endIndex === 0) ? 0 : (ns.length - 1));
        for (i = startIndex; i <= endIndex; i++) {
            ns[i].viewIndex = i;
            ns[i].viewRecordId = records[i].internalId;
            if (!ns[i].boundView) {
                ns[i].boundView = this.id;
            }
        }
    },

    /**
     * Returns the store associated with this DataView.
     * @return {Ext.data.Store} The store
     */
    getStore : function() {
        return this.store;
    },

    /**
     * Changes the data store bound to this view and refreshes it.
     * @param {Ext.data.Store} store The store to bind to this view
     */
    bindStore : function(store, initial) {
        var me = this;
        me.mixins.bindable.bindStore.apply(me, arguments);

        // Bind the store to our selection model unless it's the initial bind.
        // Initial bind takes place afterRender
        if (!initial) {
            me.getSelectionModel().bindStore(me.store);
        }

        // If we have already achieved our first layout, refresh immediately.
        // If we have bound to the Store before the first layout, then onBoxReady will
        // call doFirstRefresh
        if (me.componentLayoutCounter) {
            me.doFirstRefresh(store);
        }
    },

    /**
     * @private
     * Perform the first refresh of the View from a newly bound store.
     * 
     * This is called when this View has been sized for the first time.
     */
    doFirstRefresh: function(store) {
        var me = this;

        // Flag to prevent a second "first" refresh from onBoxReady
        me.firstRefreshDone = true;

        // 4.1.0: If we have a store, and the Store is *NOT* already loading (a refresh is on the way), then
        // on first layout, refresh regardless of record count.
        // Template may contain boilerplate HTML outside of record iteration loop.
        // Also, emptyText is appended by the refresh method.
        // We call refresh on a defer if this is the initial call, and we are configured to defer the initial refresh.
        if (store && !store.loading) {
            if (me.deferInitialRefresh) {
                me.applyFirstRefresh();
            } else {
                me.refresh();
            }
        }
    },
    
    applyFirstRefresh: function(){
        var me = this;
        if (me.isDestroyed) {
            return;
        }
        
        // In the case of an animated collapse/expand, the layout will
        // be marked as though it's complete, yet the element itself may
        // still be animating, which means we could trigger a layout while
        // everything is not in the correct place. As such, wait until the
        // animation has finished before kicking off the refresh. The problem
        // occurs because both the refresh and the animation are running on
        // a timer which makes it impossible to control the order of when
        // the refresh is fired.
        if (me.up('[isCollapsingOrExpanding]')) {
            Ext.Function.defer(me.applyFirstRefresh, 100, me);
        } else {
            Ext.Function.defer(function () {
                if (!me.isDestroyed) {
                    me.refresh();
                }
            }, 1);
        }
    },

    onUnbindStore: function(store) {
        this.setMaskBind(null);
    },

    onBindStore: function(store) {
        this.setMaskBind(store);
    },

    setMaskBind: function(store) {
        var mask = this.loadMask;
        if (mask && mask.bindStore) {
            mask.bindStore(store);
        }
    },

    getStoreListeners: function() {
        var me = this;
        return {
            refresh: me.onDataRefresh,
            add: me.onAdd,
            remove: me.onRemove,
            update: me.onUpdate,
            clear: me.refresh
        };
    },

    /**
     * @private
     * Calls this.refresh if this.blockRefresh is not true
     */
    onDataRefresh: function() {
        var me = this,
            // If we have an ancestor in a non-boxready state (collapsed or in-transition, or hidden), and we are still waiting
            // for the first refresh, then block the refresh because that first visible, expanded layout will trigger the refresh
            blockedByAncestor = !me.firstRefreshDone && (!me.rendered || me.up('[collapsed],[isCollapsingOrExpanding],[hidden]'));

        // If are blocking *an initial refresh* because of an ancestor in a non-boxready state,
        // then cancel any defer on the initial refresh that is going to happen on boxReady - that will be a data-driven refresh, NOT
        // a render-time, delayable refresh. This is particularly important if the boxready occurs because of the "preflight" layout
        // of an animated expand. If refresh is delayed it occur during the expand animation and cause errors.
        if (blockedByAncestor) {
            me.deferInitialRefresh = false;
        } else if (me.blockRefresh !== true) {
            me.firstRefreshDone = true;
            me.refresh.apply(me, arguments);
        }

    },

    /**
     * Returns the template node the passed child belongs to, or null if it doesn't belong to one.
     * @param {HTMLElement} node
     * @return {HTMLElement} The template node
     */
    findItemByChild: function(node){
        return Ext.fly(node).findParent(this.getItemSelector(), this.getTargetEl());
    },

    /**
     * Returns the template node by the Ext.EventObject or null if it is not found.
     * @param {Ext.EventObject} e
     */
    findTargetByEvent: function(e) {
        return e.getTarget(this.getItemSelector(), this.getTargetEl());
    },


    /**
     * Gets the currently selected nodes.
     * @return {HTMLElement[]} An array of HTMLElements
     */
    getSelectedNodes: function(){
        var nodes   = [],
            records = this.selModel.getSelection(),
            ln = records.length,
            i  = 0;

        for (; i < ln; i++) {
            nodes.push(this.getNode(records[i]));
        }

        return nodes;
    },

    /**
     * Gets an array of the records from an array of nodes
     * @param {HTMLElement[]} nodes The nodes to evaluate
     * @return {Ext.data.Model[]} records The {@link Ext.data.Model} objects
     */
    getRecords: function(nodes) {
        var records = [],
            i = 0,
            len = nodes.length,
            data = this.store.data;

        for (; i < len; i++) {
            records[records.length] = data.getByKey(nodes[i].viewRecordId);
        }

        return records;
    },

    /**
     * Gets a record from a node
     * @param {Ext.Element/HTMLElement} node The node to evaluate
     *
     * @return {Ext.data.Model} record The {@link Ext.data.Model} object
     */
    getRecord: function(node){
        return this.store.data.getByKey(Ext.getDom(node).viewRecordId);
    },


    /**
     * Returns true if the passed node is selected, else false.
     * @param {HTMLElement/Number/Ext.data.Model} node The node, node index or record to check
     * @return {Boolean} True if selected, else false
     */
    isSelected : function(node) {
        // TODO: El/Idx/Record
        var r = this.getRecord(node);
        return this.selModel.isSelected(r);
    },

    /**
     * Selects a record instance by record instance or index.
     * @param {Ext.data.Model[]/Number} records An array of records or an index
     * @param {Boolean} keepExisting
     * @param {Boolean} suppressEvent Set to false to not fire a select event
     * @deprecated 4.0 Use {@link Ext.selection.Model#select} instead.
     */
    select: function(records, keepExisting, suppressEvent) {
        this.selModel.select(records, keepExisting, suppressEvent);
    },

    /**
     * Deselects a record instance by record instance or index.
     * @param {Ext.data.Model[]/Number} records An array of records or an index
     * @param {Boolean} suppressEvent Set to false to not fire a deselect event
     */
    deselect: function(records, suppressEvent) {
        this.selModel.deselect(records, suppressEvent);
    },

    /**
     * Gets a template node.
     * @param {HTMLElement/String/Number/Ext.data.Model} nodeInfo An HTMLElement template node, index of a template node,
     * the id of a template node or the record associated with the node.
     * @return {HTMLElement} The node or null if it wasn't found
     */
    getNode : function(nodeInfo) {
        if ((!nodeInfo && nodeInfo !== 0) || !this.rendered) {
            return null;
        }

        if (Ext.isString(nodeInfo)) {
            return document.getElementById(nodeInfo);
        }
        if (Ext.isNumber(nodeInfo)) {
            return this.all.elements[nodeInfo];
        }
        if (nodeInfo.isModel) {
            return this.getNodeByRecord(nodeInfo);
        }
        return nodeInfo; // already an HTMLElement
    },

    /**
     * @private
     */
    getNodeByRecord: function(record) {
        var ns = this.all.elements,
            ln = ns.length,
            i = 0;

        for (; i < ln; i++) {
            if (ns[i].viewRecordId === record.internalId) {
                return ns[i];
            }
        }

        return null;
    },

    /**
     * Gets a range nodes.
     * @param {Number} start (optional) The index of the first node in the range
     * @param {Number} end (optional) The index of the last node in the range
     * @return {HTMLElement[]} An array of nodes
     */
    getNodes: function(start, end) {
        var ns = this.all.elements;

        if (end === undefined) {
            end = ns.length;
        } else {
            end++;
        }
        return this.all.elements.slice(start||0, end);
    },

    /**
     * Finds the index of the passed node.
     * @param {HTMLElement/String/Number/Ext.data.Model} nodeInfo An HTMLElement template node, index of a template node, the id of a template node
     * or a record associated with a node.
     * @return {Number} The index of the node or -1
     */
    indexOf: function(node) {
        node = this.getNode(node);
        if (!node && node !== 0) {
            return -1;
        }
        if (Ext.isNumber(node.viewIndex)) {
            return node.viewIndex;
        }
        return this.all.indexOf(node);
    },

    onDestroy : function() {
        var me = this;

        me.all.clear();
        me.callParent();
        me.bindStore(null);
        me.selModel.destroy();
    },

    // invoked by the selection model to maintain visual UI cues
    onItemSelect: function(record) {
        var node = this.getNode(record);

        if (node) {
            Ext.fly(node).addCls(this.selectedItemCls);
        }
    },

    // invoked by the selection model to maintain visual UI cues
    onItemDeselect: function(record) {
        var node = this.getNode(record);

        if (node) {
            Ext.fly(node).removeCls(this.selectedItemCls);
        }
    },

    getItemSelector: function() {
        return this.itemSelector;
    }
}, function() {
    // all of this information is available directly
    // from the SelectionModel itself, the only added methods
    // to DataView regarding selection will perform some transformation/lookup
    // between HTMLElement/Nodes to records and vice versa.
    Ext.deprecate('extjs', '4.0', function() {
        Ext.view.AbstractView.override({
            /**
             * @cfg {Boolean} [multiSelect=false]
             * True to allow selection of more than one item at a time, false to allow selection of only a single item
             * at a time or no selection at all, depending on the value of {@link #singleSelect}.
             * @deprecated 4.1.1 Use {@link Ext.selection.Model#mode} 'MULTI' instead.
             */
            /**
             * @cfg {Boolean} [singleSelect]
             * Allows selection of exactly one item at a time. As this is the default selection mode anyway, this config
             * is completely ignored.
             * @removed 4.1.1 Use {@link Ext.selection.Model#mode} 'SINGLE' instead.
             */
            /**
             * @cfg {Boolean} [simpleSelect=false]
             * True to enable multiselection by clicking on multiple items without requiring the user to hold Shift or Ctrl,
             * false to force the user to hold Ctrl or Shift to select more than on item.
             * @deprecated 4.1.1 Use {@link Ext.selection.Model#mode} 'SIMPLE' instead.
             */

            /**
             * Gets the number of selected nodes.
             * @return {Number} The node count
             * @deprecated 4.0 Use {@link Ext.selection.Model#getCount} instead.
             */
            getSelectionCount : function(){
                if (Ext.global.console) {
                    Ext.global.console.warn("DataView: getSelectionCount will be removed, please interact with the Ext.selection.DataViewModel");
                }
                return this.selModel.getSelection().length;
            },

            /**
             * Gets an array of the selected records
             * @return {Ext.data.Model[]} An array of {@link Ext.data.Model} objects
             * @deprecated 4.0 Use {@link Ext.selection.Model#getSelection} instead.
             */
            getSelectedRecords : function(){
                if (Ext.global.console) {
                    Ext.global.console.warn("DataView: getSelectedRecords will be removed, please interact with the Ext.selection.DataViewModel");
                }
                return this.selModel.getSelection();
            },

            select: function(records, keepExisting, supressEvents) {
                if (Ext.global.console) {
                    Ext.global.console.warn("DataView: select will be removed, please access select through a DataView's SelectionModel, ie: view.getSelectionModel().select()");
                }
                var sm = this.getSelectionModel();
                return sm.select.apply(sm, arguments);
            },

            /**
             * Deselects all selected records.
             * @deprecated 4.0 Use {@link Ext.selection.Model#deselectAll} instead.
             */
            clearSelections: function() {
                if (Ext.global.console) {
                    Ext.global.console.warn("DataView: clearSelections will be removed, please access deselectAll through DataView's SelectionModel, ie: view.getSelectionModel().deselectAll()");
                }
                var sm = this.getSelectionModel();
                return sm.deselectAll();
            }
        });
    });
});
