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dialog box to confirm delete [message #508736]

Wed, 20 January 2010 03:24

John Ye

Messages: 20
Registered: July 2009

Junior Member

I am customizing an emf generated editor with tables and trees. I would like to add a dialog box to confirm delete and give user a chance to cancel. What is the best way to do it?

I can override Command's execute function to launch a MessageBox, but this creates coupling with UI. Besides, editor is marked as dirty already.

A related question is how to provide feedback on how many objects by type are deleted through statusLineManager, especially when delete cascade.

Thanks a lot.

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Re: dialog box to confirm delete [message #508798 is a reply to message #508736]

Wed, 20 January 2010 06:32

Ed Merks

Messages: 30646
Registered: July 2009

Senior Member

John,

Comments below.

John Ye wrote:
> I am customizing an emf generated editor with tables and trees. I
> would like to add a dialog box to confirm delete and give user a
> chance to cancel. What is the best way to do it?
Does delete have some permanent impact that's not undoable?
>
> I can override Command's execute function to launch a MessageBox, but
> this creates coupling with UI. Besides, editor is marked as dirty
> already.
And by then it's already been tested if it's executable and is expected
to execute properly.
>
> A related question is how to provide feedback on how many objects by
> type are deleted through statusLineManager, especially when delete
> cascade.
For all these things you'd need to override DeleteAction itself.
> Thanks a lot.
>

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Re: dialog box to confirm delete [message #508903 is a reply to message #508798]

Wed, 20 January 2010 16:39

John Ye

Messages: 20
Registered: July 2009

Junior Member

Ed,

Thanks a lot for your help. I will override DeleteAction's createCommand function to implement cascade deletion. I ran into problems when overriding ItemProviderAdapter's createRemoveCommand function.

I guess I can override run() function of DeleteAction to provide UI feedback.

The delete action is undoable. I plan to show a dialog box with "Do not show this dialog again" checkbox so that the dialog box is only shown the first time.

Thanks again,
John

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