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Howto intercept deletion of figures [message #223563]

Tue, 31 March 2009 10:43

Robert Wloch

Messages: 109
Registered: July 2009

Senior Member

Hello everyone,

Already for days I'm trying to find a way to hook into the process of
deleting selected figures when the delete key is pressed.

I digged deep into GMF down to PromptingDeleteAction and its
createCommand(List). Is there any way to subclass that class and hook the
subclass back into my generated GMF editor?

I need to semantically analyze the list of selected objects and optionally
show a dialog to abort the delete command. From what I've seen and
debugged the last week my guess is, there's no better way than subclassing
PromptingDeleteAction and override createCommand(List).

Any idea is appreciated.

Cheers,
Rob

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Re: Howto intercept deletion of figures [message #223619 is a reply to message #223563]

Tue, 31 March 2009 11:49

Eclipse User

Originally posted by: cayla_sha.gmx.net

there are this EditHelpers where you could overwrite
getDestroyElementCommand, but I think that`s too late in the
deletion-process for you.

Robert Wloch schrieb:
> Hello everyone,
>
> Already for days I'm trying to find a way to hook into the process of
> deleting selected figures when the delete key is pressed.
>
> I digged deep into GMF down to PromptingDeleteAction and its
> createCommand(List). Is there any way to subclass that class and hook
> the subclass back into my generated GMF editor?
>
> I need to semantically analyze the list of selected objects and
> optionally show a dialog to abort the delete command. From what I've
> seen and debugged the last week my guess is, there's no better way than
> subclassing PromptingDeleteAction and override createCommand(List).
>
> Any idea is appreciated.
>
> Cheers,
> Rob
>

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Re: Howto intercept deletion of figures [message #223626 is a reply to message #223619]

Tue, 31 March 2009 12:18

Robert Wloch

Messages: 109
Registered: July 2009

Senior Member

Yes, that's too late. It was my second try :-(
Right now, I'm trying to put a new delete command to the diagram viewer's
key handler. However, originally the getKeyHandler() method uses an
internal ActionRegistry to store the initially created action. This
probably won't work either.

Cayla Sha wrote:

> there are this EditHelpers where you could overwrite
> getDestroyElementCommand, but I think that`s too late in the
> deletion-process for you.

> Robert Wloch schrieb:
>> Hello everyone,
>>
>> Already for days I'm trying to find a way to hook into the process of
>> deleting selected figures when the delete key is pressed.
>>
>> I digged deep into GMF down to PromptingDeleteAction and its
>> createCommand(List). Is there any way to subclass that class and hook
>> the subclass back into my generated GMF editor?
>>
>> I need to semantically analyze the list of selected objects and
>> optionally show a dialog to abort the delete command. From what I've
>> seen and debugged the last week my guess is, there's no better way than
>> subclassing PromptingDeleteAction and override createCommand(List).
>>
>> Any idea is appreciated.
>>
>> Cheers,
>> Rob
>>

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