{@link updateBuffer}.
+ */
+ autoReload : true,
+ /**
+ * @cfg {Boolean} encode
+ * Specify true for {@link #buildQuery} to use Ext.util.JSON.encode to
+ * encode the filter query parameter sent with a remote request.
+ * Defaults to false.
+ */
+ /**
+ * @cfg {Array} filters
+ * An Array of filters config objects. Refer to each filter type class for
+ * configuration details specific to each filter type. Filters for Strings,
+ * Numeric Ranges, Date Ranges, Lists, and Boolean are the standard filters
+ * available.
+ */
+ /**
+ * @cfg {String} filterCls
+ * The css class to be applied to column headers with active filters.
+ * Defaults to 'ux-filterd-column'.
+ */
+ filterCls : 'ux-filtered-column',
+ /**
+ * @cfg {Boolean} local
+ * true to use Ext.data.Store filter functions (local filtering)
+ * instead of the default (false) server side filtering.
+ */
+ local : false,
+ /**
+ * @cfg {String} menuFilterText
+ * defaults to 'Filters'.
+ */
+ menuFilterText : 'Filters',
+ /**
+ * @cfg {String} paramPrefix
+ * The url parameter prefix for the filters.
+ * Defaults to 'filter'.
+ */
+ paramPrefix : 'filter',
+ /**
+ * @cfg {Boolean} showMenu
+ * Defaults to true, including a filter submenu in the default header menu.
+ */
+ showMenu : true,
+ /**
+ * @cfg {String} stateId
+ * Name of the value to be used to store state information.
+ */
+ stateId : undefined,
+ /**
+ * @cfg {Integer} updateBuffer
+ * Number of milliseconds to defer store updates since the last filter change.
+ */
+ updateBuffer : 500,
+
+ // doesn't handle grid body events
+ hasFeatureEvent: false,
+
+
+ /** @private */
+ constructor : function (config) {
+ var me = this;
+
+ config = config || {};
+ Ext.apply(me, config);
+
+ me.deferredUpdate = Ext.create('Ext.util.DelayedTask', me.reload, me);
+
+ // Init filters
+ me.filters = Ext.create('Ext.util.MixedCollection', false, function (o) {
+ return o ? o.dataIndex : null;
+ });
+ me.filterConfigs = config.filters;
+ },
+
+
+ attachEvents: function() {
+ var me = this,
+ view = me.view,
+ headerCt = view.headerCt,
+ grid = me.getGridPanel();
+
+ me.bindStore(view.getStore(), true);
+
+ // Listen for header menu being created
+ headerCt.on('menucreate', me.onMenuCreate, me);
+
+ view.on('refresh', me.onRefresh, me);
+ grid.on({
+ scope: me,
+ beforestaterestore: me.applyState,
+ beforestatesave: me.saveState,
+ beforedestroy: me.destroy
+ });
+
+ // Add event and filters shortcut on grid panel
+ grid.filters = me;
+ grid.addEvents('filterupdate');
+ },
+
+ /**
+ * @private Create the Filter objects for the current configuration, destroying any existing ones first.
+ */
+ createFilters: function() {
+ var me = this,
+ filterConfigs = me.filterConfigs,
+ hadFilters = me.filters.getCount(),
+ state;
+ if (hadFilters) {
+ state = {};
+ me.saveState(null, state);
+ }
+ me.removeAll();
+ me.addFilters(Ext.isEmpty(filterConfigs) ? me.view.headerCt.items.items : filterConfigs);
+ if (hadFilters) {
+ me.applyState(null, state);
+ }
+ },
+
+ /**
+ * @private Handle creation of the grid's header menu. Initializes the filters and listens
+ * for the menu being shown.
+ */
+ onMenuCreate: function(headerCt, menu) {
+ var me = this;
+ me.createFilters();
+ menu.on('beforeshow', me.onMenuBeforeShow, me);
+ },
+
+ /**
+ * @private Handle showing of the grid's header menu. Sets up the filter item and menu
+ * appropriate for the target column.
+ */
+ onMenuBeforeShow: function(menu) {
+ var me = this,
+ menuItem, filter;
+
+ if (me.showMenu) {
+ menuItem = me.menuItem;
+ if (!menuItem || menuItem.isDestroyed) {
+ me.createMenuItem(menu);
+ menuItem = me.menuItem;
+ }
+
+ filter = me.getMenuFilter();
+
+ if (filter) {
+ menuItem.menu = filter.menu;
+ menuItem.setChecked(filter.active);
+ // disable the menu if filter.disabled explicitly set to true
+ menuItem.setDisabled(filter.disabled === true);
+ }
+ menuItem.setVisible(!!filter);
+ this.sep.setVisible(!!filter);
+ }
+ },
+
+
+ createMenuItem: function(menu) {
+ var me = this;
+ me.sep = menu.add('-');
+ me.menuItem = menu.add({
+ checked: false,
+ itemId: 'filters',
+ text: me.menuFilterText,
+ listeners: {
+ scope: me,
+ checkchange: me.onCheckChange,
+ beforecheckchange: me.onBeforeCheck
+ }
+ });
+ },
+
+ getGridPanel: function() {
+ return this.view.up('gridpanel');
+ },
+
+ /**
+ * @private
+ * Handler for the grid's beforestaterestore event (fires before the state of the
+ * grid is restored).
+ * @param {Object} grid The grid object
+ * @param {Object} state The hash of state values returned from the StateProvider.
+ */
+ applyState : function (grid, state) {
+ var key, filter;
+ this.applyingState = true;
+ this.clearFilters();
+ if (state.filters) {
+ for (key in state.filters) {
+ filter = this.filters.get(key);
+ if (filter) {
+ filter.setValue(state.filters[key]);
+ filter.setActive(true);
+ }
+ }
+ }
+ this.deferredUpdate.cancel();
+ if (this.local) {
+ this.reload();
+ }
+ delete this.applyingState;
+ delete state.filters;
+ },
+
+ /**
+ * Saves the state of all active filters
+ * @param {Object} grid
+ * @param {Object} state
+ * @return {Boolean}
+ */
+ saveState : function (grid, state) {
+ var filters = {};
+ this.filters.each(function (filter) {
+ if (filter.active) {
+ filters[filter.dataIndex] = filter.getValue();
+ }
+ });
+ return (state.filters = filters);
+ },
+
+ /**
+ * @private
+ * Handler called by the grid 'beforedestroy' event
+ */
+ destroy : function () {
+ var me = this;
+ Ext.destroyMembers(me, 'menuItem', 'sep');
+ me.removeAll();
+ me.clearListeners();
+ },
+
+ /**
+ * Remove all filters, permanently destroying them.
+ */
+ removeAll : function () {
+ if(this.filters){
+ Ext.destroy.apply(Ext, this.filters.items);
+ // remove all items from the collection
+ this.filters.clear();
+ }
+ },
+
+
+ /**
+ * Changes the data store bound to this view and refreshes it.
+ * @param {Store} store The store to bind to this view
+ */
+ bindStore : function(store, initial){
+ if(!initial && this.store){
+ if (this.local) {
+ store.un('load', this.onLoad, this);
+ } else {
+ store.un('beforeload', this.onBeforeLoad, this);
+ }
+ }
+ if(store){
+ if (this.local) {
+ store.on('load', this.onLoad, this);
+ } else {
+ store.on('beforeload', this.onBeforeLoad, this);
+ }
+ }
+ this.store = store;
+ },
+
+
+ /**
+ * @private
+ * Get the filter menu from the filters MixedCollection based on the clicked header
+ */
+ getMenuFilter : function () {
+ var header = this.view.headerCt.getMenu().activeHeader;
+ return header ? this.filters.get(header.dataIndex) : null;
+ },
+
+ /** @private */
+ onCheckChange : function (item, value) {
+ this.getMenuFilter().setActive(value);
+ },
+
+ /** @private */
+ onBeforeCheck : function (check, value) {
+ return !value || this.getMenuFilter().isActivatable();
+ },
+
+ /**
+ * @private
+ * Handler for all events on filters.
+ * @param {String} event Event name
+ * @param {Object} filter Standard signature of the event before the event is fired
+ */
+ onStateChange : function (event, filter) {
+ if (event !== 'serialize') {
+ var me = this,
+ grid = me.getGridPanel();
+
+ if (filter == me.getMenuFilter()) {
+ me.menuItem.setChecked(filter.active, false);
+ }
+
+ if ((me.autoReload || me.local) && !me.applyingState) {
+ me.deferredUpdate.delay(me.updateBuffer);
+ }
+ me.updateColumnHeadings();
+
+ if (!me.applyingState) {
+ grid.saveState();
+ }
+ grid.fireEvent('filterupdate', me, filter);
+ }
+ },
+
+ /**
+ * @private
+ * Handler for store's beforeload event when configured for remote filtering
+ * @param {Object} store
+ * @param {Object} options
+ */
+ onBeforeLoad : function (store, options) {
+ options.params = options.params || {};
+ this.cleanParams(options.params);
+ var params = this.buildQuery(this.getFilterData());
+ Ext.apply(options.params, params);
+ },
+
+ /**
+ * @private
+ * Handler for store's load event when configured for local filtering
+ * @param {Object} store
+ * @param {Object} options
+ */
+ onLoad : function (store, options) {
+ store.filterBy(this.getRecordFilter());
+ },
+
+ /**
+ * @private
+ * Handler called when the grid's view is refreshed
+ */
+ onRefresh : function () {
+ this.updateColumnHeadings();
+ },
+
+ /**
+ * Update the styles for the header row based on the active filters
+ */
+ updateColumnHeadings : function () {
+ var me = this,
+ headerCt = me.view.headerCt;
+ if (headerCt) {
+ headerCt.items.each(function(header) {
+ var filter = me.getFilter(header.dataIndex);
+ header[filter && filter.active ? 'addCls' : 'removeCls'](me.filterCls);
+ });
+ }
+ },
+
+ /** @private */
+ reload : function () {
+ var me = this,
+ store = me.view.getStore(),
+ start;
+
+ if (me.local) {
+ store.clearFilter(true);
+ store.filterBy(me.getRecordFilter());
+ } else {
+ me.deferredUpdate.cancel();
+ store.loadPage(1);
+ }
+ },
+
+ /**
+ * Method factory that generates a record validator for the filters active at the time
+ * of invokation.
+ * @private
+ */
+ getRecordFilter : function () {
+ var f = [], len, i;
+ this.filters.each(function (filter) {
+ if (filter.active) {
+ f.push(filter);
+ }
+ });
+
+ len = f.length;
+ return function (record) {
+ for (i = 0; i < len; i++) {
+ if (!f[i].validateRecord(record)) {
+ return false;
+ }
+ }
+ return true;
+ };
+ },
+
+ /**
+ * Adds a filter to the collection and observes it for state change.
+ * @param {Object/Ext.ux.grid.filter.Filter} config A filter configuration or a filter object.
+ * @return {Ext.ux.grid.filter.Filter} The existing or newly created filter object.
+ */
+ addFilter : function (config) {
+ var Cls = this.getFilterClass(config.type),
+ filter = config.menu ? config : (new Cls(config));
+ this.filters.add(filter);
+
+ Ext.util.Observable.capture(filter, this.onStateChange, this);
+ return filter;
+ },
+
+ /**
+ * Adds filters to the collection.
+ * @param {Array} filters An Array of filter configuration objects.
+ */
+ addFilters : function (filters) {
+ if (filters) {
+ var i, len, filter;
+ for (i = 0, len = filters.length; i < len; i++) {
+ filter = filters[i];
+ // if filter config found add filter for the column
+ if (filter) {
+ this.addFilter(filter);
+ }
+ }
+ }
+ },
+
+ /**
+ * Returns a filter for the given dataIndex, if one exists.
+ * @param {String} dataIndex The dataIndex of the desired filter object.
+ * @return {Ext.ux.grid.filter.Filter}
+ */
+ getFilter : function (dataIndex) {
+ return this.filters.get(dataIndex);
+ },
+
+ /**
+ * Turns all filters off. This does not clear the configuration information
+ * (see {@link #removeAll}).
+ */
+ clearFilters : function () {
+ this.filters.each(function (filter) {
+ filter.setActive(false);
+ });
+ },
+
+ /**
+ * Returns an Array of the currently active filters.
+ * @return {Array} filters Array of the currently active filters.
+ */
+ getFilterData : function () {
+ var filters = [], i, len;
+
+ this.filters.each(function (f) {
+ if (f.active) {
+ var d = [].concat(f.serialize());
+ for (i = 0, len = d.length; i < len; i++) {
+ filters.push({
+ field: f.dataIndex,
+ data: d[i]
+ });
+ }
+ }
+ });
+ return filters;
+ },
+
+ /**
+ * Function to take the active filters data and build it into a query.
+ * The format of the query depends on the {@link #encode}
+ * configuration:
+ * {@link #paramPrefix}='filters':
+ *
+filters[0][field]="someDataIndex"&
+filters[0][data][comparison]="someValue1"&
+filters[0][data][type]="someValue2"&
+filters[0][data][value]="someValue3"&
+ *
+filters[0][field]="someDataIndex"&
+filters[0][data][comparison]="someValue1"&
+filters[0][data][type]="someValue2"&
+filters[0][data][value]="someValue3"&
+ *