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Drag and Drop - one more time [message #194742]

Mon, 05 September 2005 12:00

Eclipse User

Originally posted by: greg.gigon.tugulu.com

Hello.
I'm trying to build custom Editor plugin for Eclipse. I manage get
throught doc for GEF and fiew web sites with examples.
I tried to set up some simple editor with one element moving on an
graphical editor page.(Simple Drag and Drop without any action taken).
In doc is an information that I shouldnt Use
/AbstractTransferDragSourceListener/ from
*org.eclipse.gef.dnd.AbstractTransferDragSourceListener *package and
instead of it I should use
the interface from jFace package /TransferDragSourceListener.
/I've created simple class

ElementsDragSourceListener.java
/*
package dnd;

import org.eclipse.jface.util.TransferDragSourceListener;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.Transfer;

public class ElementsDragSourceListener implements
TransferDragSourceListener
{

public Transfer getTransfer()
{
return null;
}

public void dragStart(DragSourceEvent event)
{
}

public void dragSetData(DragSourceEvent event)
{
event.data = event.getSource().toString();
}

public void dragFinished(DragSourceEvent event)
{
}

}
/*/

/and added it to ElementEditPart in createFigure() Method:
protected IFigure createFigure()
{
IFigure f = new MenuViewElement();
getViewer().addDragSourceListener(new ElementsDragSourceListener());
return f;
}

When I run project I got my element on page and when I start to drag it
I got :
*
Unhandled event loop exception
Reason:
java.lang.NullPointerException

*and element is not Dragging around :(

Can anyone please point me to new GOOD direction???

Greg

Re: Drag and Drop - one more time [message #194781 is a reply to message #194742]

Tue, 06 September 2005 04:13

Eclipse User

Originally posted by: greg.gigon.tugulu.com

Guys, I'm in serious need.
Please help me a little :)

Greg

Re: Drag and Drop - one more time [message #194789 is a reply to message #194781]

Tue, 06 September 2005 04:56

Eclipse User

Originally posted by: greg.gigon.tugulu.com

Hey guys, maybe You know good working example with dragable elements. I
just need to move it on a screen, that's it :)

Greg

> Guys, I'm in serious need.
> Please help me a little :)
>
> Greg

Re: Drag and Drop - one more time [message #194803 is a reply to message #194742]

Tue, 06 September 2005 09:25

Eclipse User

Originally posted by: none.unknown.com

You should look at the NPE stack trace. Bring up the Error View in Eclipse
to see it.

"Greg" <greg.gigon@tugulu.com> wrote in message
news:dfhq26$3oh$1@news.eclipse.org...
> Hello.
> I'm trying to build custom Editor plugin for Eclipse. I manage get
> throught doc for GEF and fiew web sites with examples.
> I tried to set up some simple editor with one element moving on an
> graphical editor page.(Simple Drag and Drop without any action taken).
> In doc is an information that I shouldnt Use
> /AbstractTransferDragSourceListener/ from
> *org.eclipse.gef.dnd.AbstractTransferDragSourceListener *package and
> instead of it I should use
> the interface from jFace package /TransferDragSourceListener.
> /I've created simple class
>
> ElementsDragSourceListener.java
> /*
> package dnd;
>
> import org.eclipse.jface.util.TransferDragSourceListener;
> import org.eclipse.swt.dnd.DragSourceEvent;
> import org.eclipse.swt.dnd.Transfer;
>
> public class ElementsDragSourceListener implements
> TransferDragSourceListener
> {
>
> public Transfer getTransfer()
> {
> return null;
> }
>
> public void dragStart(DragSourceEvent event)
> {
> }
>
> public void dragSetData(DragSourceEvent event)
> {
> event.data = event.getSource().toString();
> }
>
> public void dragFinished(DragSourceEvent event)
> {
> }
>
> }
> /*/
>
> /and added it to ElementEditPart in createFigure() Method:
> protected IFigure createFigure()
> {
> IFigure f = new MenuViewElement();
> getViewer().addDragSourceListener(new
ElementsDragSourceListener());
> return f;
> }
>
> When I run project I got my element on page and when I start to drag it
> I got :
> *
> Unhandled event loop exception
> Reason:
> java.lang.NullPointerException
>
> *and element is not Dragging around :(
>
> Can anyone please point me to new GOOD direction???
>
> Greg

Re: Drag and Drop - one more time [message #194839 is a reply to message #194789]

Tue, 06 September 2005 10:11

Eclipse User

Originally posted by: harsh.ti.com

Greg,

You can download the logic editor example from the GEF home page (download
section). It should give you a good starting point. The logic edtior
does all the basic things you might need.

Harsh

Re: Drag and Drop - one more time [message #194896 is a reply to message #194839]

Tue, 06 September 2005 11:38

Eclipse User

Originally posted by: greg.gigon.tugulu.com

I have this example but it's quite complex for someone who started with
GEF.

Documentation for this project is not the best in the world. GEF seems
like helping a lot, but not for newbies :-/

I'll give this example one more try anyway :)

Cheers, Mate

Greg

> Greg,
>
> You can download the logic editor example from the GEF home page
> (download section). It should give you a good starting point. The
> logic edtior does all the basic things you might need.
>
> Harsh
>
>
>

Re: Drag and Drop - one more time [message #194908 is a reply to message #194896]

Tue, 06 September 2005 11:45

Eclipse User

Originally posted by: harsh.ti.com

I have a very simple example that I can email to you.

Please send me your email address.

Thank you,

Harsh

Re: Drag and Drop - one more time [message #194935 is a reply to message #194839]

Tue, 06 September 2005 14:05

Eclipse User

Originally posted by: none.us.ibm.com

Please download the latest maintenance build and look at the improved
documentation.

Are you sure you need native DND, or just plain dragging?

"Harsh" <harsh@ti.com> wrote in message
news:829e59e5f60e1facafee7851592e60ae$1@www.eclipse.org...
> Greg,
>
> You can download the logic editor example from the GEF home page (download
> section). It should give you a good starting point. The logic edtior
> does all the basic things you might need.
>
> Harsh
>
>
>

Attachment: help.gif
(Size: 53.88KB, Downloaded 173 times)

Re: Drag and Drop - one more time [message #194983 is a reply to message #194935]

Wed, 07 September 2005 05:09

Eclipse User

Originally posted by: greg.gigon.tugulu.com

Well, I need to add this functionality to and editor:
- tree Items needs to be dragable to palette in order to customize it.
- I need to drag elements on screen editor to rearange it.
- I need to snap elements to grid on diagram.

I don't know what should I use. If GEF provides support for all that I'm
trying to achive I'll be more then happy to use it.

Cheers, Greg

Randy Hudson wrote:
> Please download the latest maintenance build and look at the improved
> documentation.
>
> Are you sure you need native DND, or just plain dragging?
>

Re: Drag and Drop - one more time [message #195212 is a reply to message #194983]

Thu, 08 September 2005 13:08

Eclipse User

Originally posted by: none.unknown.com

Yes, GEF logic example already does 2 and 3. I think you can make 1 work
without too much trouble.

"Greg" <greg.gigon@tugulu.com> wrote in message
news:dfmane$p91$1@news.eclipse.org...
> Well, I need to add this functionality to and editor:
> - tree Items needs to be dragable to palette in order to customize it.
> - I need to drag elements on screen editor to rearange it.
> - I need to snap elements to grid on diagram.
>
> I don't know what should I use. If GEF provides support for all that I'm
> trying to achive I'll be more then happy to use it.
>
> Cheers, Greg
>
>
>
> Randy Hudson wrote:
> > Please download the latest maintenance build and look at the improved
> > documentation.
> >
> > Are you sure you need native DND, or just plain dragging?
> >

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