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+Sencha Documentation Project/**
+ * @class Ext.view.BoundListKeyNav
+ * @extends Ext.util.KeyNav
+ * A specialized {@link Ext.util.KeyNav} implementation for navigating a {@link Ext.view.BoundList} using
+ * the keyboard. The up, down, pageup, pagedown, home, and end keys move the active highlight
+ * through the list. The enter key invokes the selection model's select action using the highlighted item.
+ */
+Ext.define('Ext.view.BoundListKeyNav', {
+ extend: 'Ext.util.KeyNav',
+ requires: 'Ext.view.BoundList',
+
+ /**
+ * @cfg {Ext.view.BoundList} boundList
+ * @required
+ * The {@link Ext.view.BoundList} instance for which key navigation will be managed. This is required.
+ */
+
+ constructor: function(el, config) {
+ var me = this;
+ me.boundList = config.boundList;
+ me.callParent([el, Ext.apply({}, config, me.defaultHandlers)]);
+ },
+
+ defaultHandlers: {
+ up: function() {
+ var me = this,
+ boundList = me.boundList,
+ allItems = boundList.all,
+ oldItem = boundList.highlightedItem,
+ oldItemIdx = oldItem ? boundList.indexOf(oldItem) : -1,
+ newItemIdx = oldItemIdx > 0 ? oldItemIdx - 1 : allItems.getCount() - 1; //wraps around
+ me.highlightAt(newItemIdx);
+ },
+
+ down: function() {
+ var me = this,
+ boundList = me.boundList,
+ allItems = boundList.all,
+ oldItem = boundList.highlightedItem,
+ oldItemIdx = oldItem ? boundList.indexOf(oldItem) : -1,
+ newItemIdx = oldItemIdx < allItems.getCount() - 1 ? oldItemIdx + 1 : 0; //wraps around
+ me.highlightAt(newItemIdx);
+ },
+
+ pageup: function() {
+ //TODO
+ },
+
+ pagedown: function() {
+ //TODO
+ },
+
+ home: function() {
+ this.highlightAt(0);
+ },
+
+ end: function() {
+ var me = this;
+ me.highlightAt(me.boundList.all.getCount() - 1);
+ },
+
+ enter: function(e) {
+ this.selectHighlighted(e);
+ }
+ },
+
+ /**
+ * Highlights the item at the given index.
+ * @param {Number} index
+ */
+ highlightAt: function(index) {
+ var boundList = this.boundList,
+ item = boundList.all.item(index);
+ if (item) {
+ item = item.dom;
+ boundList.highlightItem(item);
+ boundList.getTargetEl().scrollChildIntoView(item, false);
+ }
+ },
+
+ /**
+ * Triggers selection of the currently highlighted item according to the behavior of
+ * the configured SelectionModel.
+ */
+ selectHighlighted: function(e) {
+ var me = this,
+ boundList = me.boundList,
+ highlighted = boundList.highlightedItem,
+ selModel = boundList.getSelectionModel();
+ if (highlighted) {
+ selModel.selectWithEvent(boundList.getRecord(highlighted), e);
+ }
+ }
+
+});
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