DnDSupport.java 文件源码

private boolean handleDropImpl(Transferable t) {       
    try {
        Object o;
        if( t.isDataFlavorSupported( actionDataFlavor ) ) {
            o = t.getTransferData( actionDataFlavor );
            if( o instanceof Node ) {
                DataObject dobj = ((Node)o).getLookup().lookup( DataObject.class );
                return addButton( dobj, dropTargetButtonIndex, insertBefore );
            }
        } else {
            o = t.getTransferData( buttonDataFlavor );
            if( o instanceof DataObject ) {
                return moveButton( (DataObject)o, dropTargetButtonIndex, insertBefore );
            }
        }
    } catch( UnsupportedFlavorException e ) {
        log.log( Level.INFO, null, e );
    } catch( IOException ioE ) {
        log.log( Level.INFO, null, ioE );
    }
    return false;
}