The cursor has entered the drop target boundaries.
The following fields in the DropTargetEvent apply:
operations value is determined by the modifier keys pressed by the user.
If no keys are pressed the
event.detail field is set to DND.DROP_DEFAULT.
If the application does not set the
event.detail to something other
DND.DROP_DEFAULT the operation will be set to the platform defined standard
currentDataType is determined by the first transfer agent specified in
setTransfer() that matches a data type provided by the drag source.
It is possible to get a DragEnter event when the drag source does not provide any matching data.
In this case, the default operation is DND.DROP_NONE and the currentDataType is null.
The application can change the operation that will be performed by modifying the
detail field but the choice must be one of the values in the
field or DND.DROP_NONE.
The application can also change the type of data being requested by
currentDataTypes field but the value must be one of the values