[wxpython-users] Catching user leaving the window

[Werner F. Bruhin]

Robin,

Robin Dunn wrote:
...
> Personally I think your users will hate you if you do something like 
> this.  Given the multi-process nature of modern operating systems and 
> GUI environments it is *very* common to be doing more than one thing 
> at a time, in my case it is usually a dozen or so things at one time.  
> For example, suppose the phone rings while your user is entering data, 
> and they have to switch to their calendar application to look 
> something up, and then they switch back to your application only to 
> find that their data entry work was thrown away and rolled back to the 
> prior state.  It would only take one such occurrence for me to 
> uninstall the app and never look at it again.
You are absolutely right.  Thanks for hitting me with this!
>
> Instead, let them do other things and only worry about rolling back, 
> or asking the user to save, or whatever, if they change the state in 
> your application such that it would cause the currently "dirty" data 
> entry forms to be closed, cleared, or reloaded with new data.
So, instead of depending on an event here I should set a flag/variable 
which I then need to check when loading new data (or doing other tasks 
which will have a problem with the dirty data).  I am already using 
pubsub to inform listeners that data needs saving, so I guess I just 
need to extend the listener for that to set this flag and do another 
pubsub when data is saved.

Or is there some other technique/pattern I should look out/read up on?

Werner