public interface RecordDropHandler
extends com.google.gwt.event.shared.EventHandler
| Modifier and Type | Method and Description |
|---|---|
void |
onRecordDrop(RecordDropEvent event)
Process a drop of one or more records on a ListGrid record.
|
void onRecordDrop(RecordDropEvent event)
This method can be overridden to provide custom drop
behaviors, and is a more appropriate override point than the lower level Canvas.drop() handler.
If this is a self-drop, records are simply reordered.
For a drop from another widget,
transferDragData() is called, which depending on the
dragDataAction specified on the source widget, may
either remove the source records from the original list (dragDataAction:"move") or just provide a copy to
this list (dragDataAction:"copy").
If this grid is databound, the new records will be added to the
dataset by calling DataSource.addData(). Further, if the new
records were dragged from another databound component, and addDropValues is true, getDropValues will be called for every item being dropped.
For multi-record drops, Queuing is automatically used to combine all DSRequests into a single HTTP Request (see QuickStart Guide, Server Framework chapter). This allows the server to persist all changes caused by the drop in a single transaction (and this is automatically done when using the built-in server DataSources with Power Edition and above).
Note that reordering records has no effect on a databound grid.
The newly dropped data is then selected automatically.
If these default persistence behaviors are undesirable, Call RecordDropEvent.cancel() from within onRecordDrop(com.smartgwt.client.widgets.grid.events.RecordDropEvent) to cancel them, then and
implement your own behavior, typically by using grid.updateData() or addData() to add new records.
NOTE: the
records you receive in this event are the actual Records from the source component. Use DataSource.copyRecords() to create a copy before modifying the records
or using them with updateData() or addData().
NOTE: for a drop beyond the last visible record of a ListGrid,
targetRecord will be null and the index will be one higher than the last record. This
includes a drop into an empty ListGrid, where index will be 0.
event - the event