[Pharo-users] More Morphic snags

[Markus Stumptner]

I have been trying to replicate the behaviour of an existing (non-Pharo, 
non-Smalltalk) application with Morphic. This provides grouping images 
in a workspace, and then switching between laying them out separately or 
"stacked" by double clicking on the group (or an image in it). When the 
group is stacked, it can be moved around as a single drag and drop 
operation. When the group is separated, dragging an image out of it 
removes it from the group.

On the surface this looked like a perfect fit to the submorph tree.  
Unfortunately, as both the Morphic chapter in Pharo by Example and the 
intro document by Maloney make clear, if you enable double clicking (by 
answering true to #handlesMouseDown:), you are interfering with what 
Maloney calls the "default behaviour" of being able to drag a Morph around.

How do I reinstate that behaviour if a group is clicked on and the 
double click does not happen? Neither document helps in explaining where 
that "default" can be found in the code.

Thanks
Markus