<?xml version="1.0" encoding="utf-8"?>
  <!--
          HistoryGrid
          
          The HistoryGrid is a DataGrid used to display unique search terms.
    -->
  <mx:DataGrid xmlns:mx="http://www.adobe.com/2006/mxml" xmlns="*"
                  showHeaders="false"
                  editable="false"
                  verticalGridLines="false"
                  dataProvider="{__ac}"
                  creationComplete="initComp()"
                  labelFunction="printCriteria">
          
          <mx:Script>
          <![CDATA[
                  import mx.collections.ArrayCollection;
                  import com.adobe.flickr.SearchCriteria;
                  import com.adobe.flickr.UserData;
                  import com.adobe.flickr.events.TrashcanEvent;
                  
                  private var __userData:UserData;
                  
                  [Bindable]
                  private var __ac:ArrayCollection;
                  
                  private function initComp() : void
                  {
                          __userData = new UserData();
                          var items:Array = __userData.loadHistory();
                          if( items != null ) {
                                  __ac = new ArrayCollection(items);
                          } else {
                                  __ac = new ArrayCollection();
                          }
                  }
                  
                  // Adds the criteria to the grid. The criteria must be unique.
                  
                  public function addSearchTerm( criteria:SearchCriteria ) : void
                  {
                          for(var i:Number=0; i < __ac.length; i++) {
                                  var item:SearchCriteria = SearchCriteria(__ac.getItemAt(i));
                                  if( criteria.isEqual(item) ) return; // found
                          }
                          
                          var criteria_copy:SearchCriteria = criteria.copy();
                          __ac.addItem( criteria_copy );
                          
                          __userData.saveHistory( __ac );
                  }        
                  
                  // label function - simply calls the SearchCriteria.toString() method
                  
                  private function printCriteria( item:Object, column:* ) : String
                  {
                          var criteria:SearchCriteria = SearchCriteria(item);
                          return criteria.toString();
                  }
                  
                  // deletes the item which has been dragged from the grid
                  // to the trash
                  
                  public function deleteItems( event:TrashcanEvent ) : void
                  {
                          for(var i:int=0; i < __ac.length; i++) {
                                  var item:* = __ac.getItemAt(i);
                                  if( item.tags == event.items[0].tags ) {
                                          __ac.removeItemAt(i);
                                          break;
                                  }
                          }
                  }
                  
                  // deletes the item selected
                  
                  public function deleteSelectedItem() : void
                  {
                          var item:* = selectedItem;
                          if( item != null ) {
                                  __ac.removeItemAt( selectedIndex );
                          }
                  }
          ]]>
          </mx:Script>
          
          <mx:columns>
                  <mx:DataGridColumn 
                          dataField="tags" 
                          headerText="Tags"
                          editable="false" />
          </mx:columns>
          
  </mx:DataGrid>