/** * @class Ext.util.BufferedCollection * @extends Ext.util.Collection * Description */Ext.define('Ext.util.BufferedCollection', { extend: 'Ext.util.Collection', mixins: [ 'Ext.mixin.Observable' ], config: { totalCount: 0, autoSort: false, autoFilter: false, pageSize: 0 }, updateTotalCount: function(totalCount) { this.length = totalCount; this.all = this.items = Array.apply(null, new Array(totalCount)); }, addPage: function(page, records) { var pageSize = this.getPageSize(), start = (page - 1) * pageSize, limit = pageSize; this.all.splice.apply(this.all, [start, limit].concat(records)); this.fireEvent('pageadded', page, records, this.items); }, hasRange: function(start, end) { var items = this.items, i; for (i = start; i <= end; i++) { if (!items[i]) { return false; } } return true; }});