[kepler-dev] Problems for closing unchanged workflows

Matthew Brooke brooke at nceas.ucsb.edu
Tue Apr 11 16:40:55 PDT 2006

I think I know why this is happening (and may be indirectly to blame :-)

As part of the new svg rendering, it is necessary to update/redraw the 
workflow canvas, which I do by issuing an empty ChangeRequest to get the 
canvas to update itself.

However, I think the listener that monitors changes must be treating 
this change request is an actual change (even though it is empty) - so 
it thinks the WF has been changed.

So... we need to either come up with a way of updating/redrawing the 
canvas without using empty change requests (which, I believe Christopher 
and Edward said wasn't a good way to do it anyway), or we need to alter 
the listener so it doesn't count an empty change request as an actual 
change. Or both.


Matthew Brooke, Ph.D.
Marine Sciences Research Building, Room #3407
University of California
Santa Barbara, CA  93106-6150
ph: (805) 893-7108   fx: 805-893-8062
brooke at nceas.ucsb.edu

Matt Jones wrote:
> Definitely.  I've noticed this too.  Please go ahead and fix it and let 
> us know how it goes.  If you can't fix it now you might enter a bug for 
> it so that it gets done eventually.  thanks for catching this.
> Matt
> Zhijie Guan wrote:
>> Hi, All,
>> I am not sure if it is a problem. Just to present here to see if  
>> anyone gets the same feeling with me.
>> If I open a workflow in Kepler, and I close it immediately without  
>> making any changes, the system will prompt me to "cancel/discard  
>> changes/save" the workflow. It seems the system does not know if I  
>> made changes to the workflow -- it is just to be polite to remind me  
>> to save the workflow. While I usually appreciate the reminder,  
>> sometimes I feel annoying to save an unchanged workflow. I know MS  
>> word sometimes does the same thing (force the user to save unchanged  
>> doc) for long documentations. But can we make our Keper a little bit  
>> smarter than M$ Word? ;-)
>> Our Kepler do behave differently from Word on the  "Save As"  
>> operation. If I open workflow A and save it as workflow B using the  
>> "save as" operation, Kepler actually keeps the window for A open and  
>> initialize a new window for B. As you can expect, when you close the  
>> window B that you just "saved as" without making any changes, the  
>> system will pop up a dialog to remind you to save it. Kepler will  
>> also give you the opportunity to save the original workflow A though  
>> you did not even touch it after the "save as".
>> I am not sure how hard it would be to fix these problems, if necessary.
>> Thanks!
>> Zhijie
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