Re: CellTable:: Deselecting an already selected row

public class MyDataGrid<T> extends DataGrid<T> {

 private Set<T> priorSelectionSet_;

 ....

 /**
  * Allows User To Deselect A DataGrid Row By Clicking A Second Time On The Prior Selection
  */
 private void addDeselectMechanism(){
   /*
     NOTES:  
     1. ClickHandler() fires every time the grid is clicked. 
    2. selectionModel SelectionChangeHandler() does NOT fire when clicking
       a row that is already selected.
    3. Generally, ClickHandler() fires and then SelectionChangeHandler() fires,
       but testing showed some exceptions to this order and duplicate firings.
    4. The Current SelectedSet is Updated AFTER the ClickHandler() fires, so "natural"
       ClickHandler() timing does not permit current SelectedSet inspections. 
    5. In this case, the scheduleDeferred() code will ALWAYS fires when a grid is clicked,
       it will fire at a PREDICTABLE time, and AFTER the current SelectedSet has been updated.       
  */  
  super.addHandler(new ClickHandler(){
         @Override
         public void onClick(ClickEvent event) {
          Scheduler.get().scheduleDeferred(new ScheduledCommand() {   
           @Override
           public void execute() {
            Set<T> currentSelectedSet = selectionModel_.getSelectedSet();
            if( (currentSelectedSet.size() == 1) &&
             (priorSelectionSet_ != null) ){
             if( (currentSelectedSet.size() == priorSelectionSet_.size()) &&            
                (currentSelectedSet.containsAll( priorSelectionSet_ ) ) ){         
              selectionModel_.clear();
             }
              }
           priorSelectionSet_ = new HashSet<T>();
           priorSelectionSet_.addAll( selectionModel_.getSelectedSet() );                       
           }
          });          
          
         }
     }, ClickEvent.getType());
 }

 .....

}

 

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