X-Received: by 10.224.86.200 with SMTP id t8mr9785363qal.0.1370961875646; Tue, 11 Jun 2013 07:44:35 -0700 (PDT)
X-Received: by 10.50.117.106 with SMTP id kd10mr304851igb.14.1370961875611; Tue, 11 Jun 2013 07:44:35 -0700 (PDT)
Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!ch1no4054546qab.0!news-out.google.com!y6ni1724qax.0!nntp.google.com!ch1no4054544qab.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
Newsgroups: comp.lang.java.gui
Date: Tue, 11 Jun 2013 07:44:35 -0700 (PDT)
In-Reply-To: <534db8a1-6fb0-47a4-a532-30e4bbbf0495@googlegroups.com>
Complaints-To: groups-abuse@google.com
Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=130.76.32.78; posting-account=_7xgmwoAAADi7iXKBO-oX5zbCfSzsCV0
NNTP-Posting-Host: 130.76.32.78
References: <83dd7dc7-c9d4-41b2-ada2-be50758aecf3@googlegroups.com> <534db8a1-6fb0-47a4-a532-30e4bbbf0495@googlegroups.com>
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <10095392-e92c-4285-b5f8-dbde7c18cb1a@googlegroups.com>
Subject: Re: TransferHandler exportAsDone called before exportAsDrag returns
From: FredK <fred.l.kleinschmidt@gmail.com>
Injection-Date: Tue, 11 Jun 2013 14:44:35 +0000
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Xref: csiph.com comp.lang.java.gui:5360

On Monday, June 10, 2013 3:14:11 PM UTC-7, Lew wrote:
> FredK wrote: > I have a subclass of JPanel for which I am trying to imple=
ment > drag-and-drop. I add a mouse listener to the component, and in > its=
 mousePressed() method I call > JComponent c =3D (JComponent)event.getSourc=
e(); > TransferHandler th =3D c.getTransferHandler(); > th.exportAsDrag( co=
mp, event, TransferHandler.COPY ); > > The problem is that the handler's ex=
portAsDone() method is > called immediately - before exportAsDrag() returns=
, and > before the mouse is moved or released. Can you provide an SSCCE? ht=
tp://sscce.org/ The problem appears to be in the part of the code you haven=
't shown us. Are you managing events on the EDT properly? -- Lew


I hadn't realized that JPanel (or I guess JComponent) had built-in DnD for =
bean properties - didn't see any mention of it in the Javadoc tutorials.
I now have it working - I had been using "text" as the argument for Transfe=
rHandler, but my component did not have a "text" property.

For example, this does work (and works for "text" when I add a "text" prope=
rty to my panel):

package boeing.geoduck.viewer.swingitems;

import java.awt.BorderLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.TransferHandler;

public class DragTest {

   public static void main( String args[] ) {
      SwingUtilities.invokeLater( new Runnable() {
         public void run() {
            JFrame frame =3D new JFrame();
            frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
            frame.setSize( 300, 150 );

            JPanel w =3D new JPanel();
            frame.add( w, BorderLayout.CENTER );

            w.setTransferHandler( new TransferHandler( "background" ) );

            w.addMouseListener( new MouseAdapter() {
               @Override
               public void mousePressed( MouseEvent me ) {
                  JComponent comp =3D (JComponent) me.getSource();
                  TransferHandler handler =3D comp.getTransferHandler();
                  int actions =3D handler.getSourceActions( comp );
                  System.out.println( actions );
                  handler.exportAsDrag( comp, me, TransferHandler.COPY );
               }
            } );

            frame.setVisible( true );
         }
      } );
   }
}

--=20
Fred K