[Bugs] #4403 sugar UNSP: Swipe left - right on the top side of the frame to change zoom?

[Sugar Labs Bugs]

#4403: Swipe left - right on the top side of the frame to change zoom?
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    Reporter:  manuq                      |          Owner:  erikos     
        Type:  enhancement                |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  1.0        
   Component:  sugar                      |        Version:  Unspecified
    Severity:  Unspecified                |       Keywords:             
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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Comment(by erikos):

 Replying to [comment:6 sridhar]:
 > Replying to [comment:4 erikos]:
 > > As Gary pointed out, the gesture should be available in all the view,
 not only in the upper 'toolbar area'. The patch above does add a gesture
 handler that does so.
 >
 > Understood; that sounds like a good idea. As Gary has pointed out, that
 does mean that Sugar Shell gestures shouldn't work when inside an activity
 (leaving the activity to implement its own touch events). On further
 consideration, I think that's fine for our users.

 You need to get out of the activity view as well. The activity view is
 just another zoom level. Currently the patch would display the current
 focused activity when swiping to the activity view.

 I think Gary meant the case where you switch from one open activity to
 another open activity (what you would normally do with tab). Handling
 those two cases cleanly (a) switching the zoom levels and (b) switching
 between open activities gets even more tricky.

 From the technical point of view, the current patch is a global gesture
 handler. It will listen for all the gestures and change the zoom level
 accordingly (a). This works fine in activities like Memorize but in Paint,
 some events do not get through and drawing is laggy. We came across this
 when implementing #3981 already. We should check the root cause of that
 issue.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4403#comment:7>
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