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[news.eclipse.modeling.gmf] Re: copy paste issue 
Never give up, guys ;-)

So first of all:
Did you both make sure to use uuids for your semantic model as I described earlier in step 1?

If so, copy paste should at least work for elements placed directly on the canvas.

So you must add the following extension to your plugin-xml:
<extension point="org.eclipse.emf.ecore.extension_parser">
<parser type="MY_SEMANTIC_MODEL_FILE_EXTENSION" class="org.eclipse.gmf.runtime.emf.core.resources.GMFResourceFactory">
</parser>
</extension>

Where MY_SEMANTIC_MODEL_FILE_EXTENSION seriously only is the file-extension of your editor-files.

Step 2 was the solution to make copy/paste work in compartments (container-elements).


Regards, Thomas


Am 20.02.2009 16:06, schrieb Tobias: 
Hello Marc,

it seems you have the same problem I had (and still have). The point is,
that the elements do not disappear after they have been copied, but that
only their views are copied, I guesss. To verify this, please copy-paste
an element and then modify it. If I'm right, the original element will
get changed, too.

However, this is not a solution to your problem (I wish it were, as then
my problem would be solved as well), but maybe it gives you some idea of
where to begin. For me, I tried a few days to solve it before I finally
gave up... :-(

Regards, and good luck,
Tobias



markitus schrieb: 
Hi Thomas,

Perhaps I misunderstood or I missed something. But wouldn't the result
be the same (or similar) if we extend AbstractClipboardSupport (which
implements IClipboardSupport) and rewrite these methods?
Anyway, I'm clearly confused, as you see.
My problem is not pasting into compartments , I didn't even get that
far yet :( . I've enabled the copy/Paste option so it shows up in the
contextual menu. I'm being able to copy or paste whatever elements I
want to(graphically), but when I try to make these changes persistent
these new copied elements simply disappear. Even if I add an original
object from the palette after a copy/paste action, the previously
copied elements disappear from the canvas. It is so weird!!

So I'm not sure if i have to rewrite anything since I'm not trying to
do anything special, just a simple copy paste action with simple
elements (not compartments).
Should I expect this to work straight, or should I rewrite some code ?

Thanks for your help.

Marc.

El dia Thu, 19 Feb 2009 19:22:49 +0100, en/na Thomas Beyer va escriure:

Hi Markitus,

I really struggled a long time with cut, copy & paste, especially
pasting into compartments.

From what I can tell, GMF provides everything you need and implements a
very powerful framework around copy-paste. If you see all the related
classes, its a quiet complex job.
Marios approach might also work for your use-case, unfortunately I never
got it working for my editors.

There is just two little hints, I'd like to give you: 1. Make sure to
use uuids for your semantic model as described in this post:
http://serdom.eu/ser/2008/07/02/eclipse-gmf-enabling-uuids-in-semantic-
model-the-simplest-way 
There are lots of others threats in this group, adressing exactly this
issue as well.

2. Fork the class NotationClipboardOperationHelper(in plugin
org.eclipse.gmf.runtime.notation.providers)
and modify the following methods:
a)
static EObject getSemanticPasteTarget(View view) {
View parent = (View) view.eContainer(); return
parent.getElement(); 
}

b)
private boolean shouldAllowPaste(
PasteChildOperation overriddenChildPasteOperation) {
EObject eObject = overriddenChildPasteOperation.getEObject();
EObject parentEObject = overriddenChildPasteOperation
.getParentEObject();
//implement your logic here, that checks, if eObject is allowed
zo be 
can be pasted in the parentEObject
}

I got the clue from this page:
http://wiki.eclipse.org/
GMF_Newsgroup_Q_and_A#How_to_make_copy.2Fpaste_work_on_compartments.3F 
, which contains so many useful solutions!!!

Forking basically means, you import the plugin above from the eclipse
cvs base, modify the code and use your customized plugin for your
application, rcp or whatever. (just in case you struggle with the term,
like I used to)
Let me know, if you need any further help.


HTH
Regards,
Thomas



markitus schrieb: 
Hi,

I'm trying to copy and paste single elements from a model into a new
model. Apparently it looks like it's done, since I can see a graphical
copy of that element, but if I try to save the diagram and open it back
it just disappears.

any ideas?? this is starting to drive me crazy. I haven't been able to
find any complete and clear example of a simple copy paste action on
GMF. Many people has already asked this issue on this list before me
but it seems like there aren't any convincing solution.

Please, help!

thank you!