/**
+ * @class Ext.grid.feature.Summary
+ * @extends Ext.grid.feature.AbstractSummary
+ *
+ * This feature is used to place a summary row at the bottom of the grid. If using a grouping,
+ * see {@link Ext.grid.feature.GroupingSummary}. There are 2 aspects to calculating the summaries,
+ * calculation and rendering.
+ *
+ * ## Calculation
+ * The summary value needs to be calculated for each column in the grid. This is controlled
+ * by the summaryType option specified on the column. There are several built in summary types,
+ * which can be specified as a string on the column configuration. These call underlying methods
+ * on the store:
+ *
+ * - {@link Ext.data.Store#count count}
+ * - {@link Ext.data.Store#sum sum}
+ * - {@link Ext.data.Store#min min}
+ * - {@link Ext.data.Store#max max}
+ * - {@link Ext.data.Store#average average}
+ *
+ * Alternatively, the summaryType can be a function definition. If this is the case,
+ * the function is called with an array of records to calculate the summary value.
+ *
+ * ## Rendering
+ * Similar to a column, the summary also supports a summaryRenderer function. This
+ * summaryRenderer is called before displaying a value. The function is optional, if
+ * not specified the default calculated value is shown. The summaryRenderer is called with:
+ *
+ * - value {Object} - The calculated value.
+ * - data {Object} - Contains all raw summary values for the row.
+ * - field {String} - The name of the field we are calculating
+ *
+ * ## Example Usage
+ *
+ * Ext.define('TestResult', {
+ * extend: 'Ext.data.Model',
+ * fields: ['student', {
+ * name: 'mark',
+ * type: 'int'
+ * }]
+ * });
+ *
+ * Ext.create('Ext.grid.Panel', {
+ * width: 200,
+ * height: 140,
+ * renderTo: document.body,
+ * features: [{
+ * ftype: 'summary'
+ * }],
+ * store: {
+ * model: 'TestResult',
+ * data: [{
+ * student: 'Student 1',
+ * mark: 84
+ * },{
+ * student: 'Student 2',
+ * mark: 72
+ * },{
+ * student: 'Student 3',
+ * mark: 96
+ * },{
+ * student: 'Student 4',
+ * mark: 68
+ * }]
+ * },
+ * columns: [{
+ * dataIndex: 'student',
+ * text: 'Name',
+ * summaryType: 'count',
+ * summaryRenderer: function(value){
+ * return Ext.String.format('{0} student{1}', value, value !== 1 ? 's' : '');
+ * }
+ * }, {
+ * dataIndex: 'mark',
+ * text: 'Mark',
+ * summaryType: 'average'
+ * }]
+ * });
+ */
+Ext.define('Ext.grid.feature.Summary', {
+
+ /* Begin Definitions */
+
+ extend: 'Ext.grid.feature.AbstractSummary',
+
+ alias: 'feature.summary',
+
+ /* End Definitions */
+
+ /**
+ * Gets any fragments needed for the template.
+ * @private
+ * @return {Object} The fragments
+ */
+ getFragmentTpl: function() {
+ // this gets called before render, so we'll setup the data here.
+ this.summaryData = this.generateSummaryData();
+ return this.getSummaryFragments();
+ },
+
+ /**
+ * Overrides the closeRows method on the template so we can include our own custom
+ * footer.
+ * @private
+ * @return {Object} The custom fragments
+ */
+ getTableFragments: function(){
+ if (this.showSummaryRow) {
+ return {
+ closeRows: this.closeRows
+ };
+ }
+ },
+
+ /**
+ * Provide our own custom footer for the grid.
+ * @private
+ * @return {String} The custom footer
+ */
+ closeRows: function() {
+ return '</tpl>{[this.printSummaryRow()]}';
+ },
+
+ /**
+ * Gets the data for printing a template row
+ * @private
+ * @param {Number} index The index in the template
+ * @return {Array} The template values
+ */
+ getPrintData: function(index){
+ var me = this,
+ columns = me.view.headerCt.getColumnsForTpl(),
+ i = 0,
+ length = columns.length,
+ data = [],
+ active = me.summaryData,
+ column;
+
+ for (; i < length; ++i) {
+ column = columns[i];
+ column.gridSummaryValue = this.getColumnValue(column, active);
+ data.push(column);
+ }
+ return data;
+ },
+
+ /**
+ * Generates all of the summary data to be used when processing the template
+ * @private
+ * @return {Object} The summary data
+ */
+ generateSummaryData: function(){
+ var me = this,
+ data = {},
+ store = me.view.store,
+ columns = me.view.headerCt.getColumnsForTpl(),
+ i = 0,
+ length = columns.length,
+ fieldData,
+ key,
+ comp;
+
+ for (i = 0, length = columns.length; i < length; ++i) {
+ comp = Ext.getCmp(columns[i].id);
+ data[comp.dataIndex] = me.getSummary(store, comp.summaryType, comp.dataIndex, false);
+ }
+ return data;
+ }
+});