Jon, please clarify...
1. Where selectionModel_ declared and instantiated?
2. Do you have a constructor? In the code-as-is this private method is
never called.
Thanks!
Alicia
On Friday, September 6, 2013 8:18:12 AM UTC-5, Jon T wrote:
>
> 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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