[Bugs] #3981 sugar UNSP: Global gesture to hide/show frame

[Sugar Labs Bugs]

#3981: Global gesture to hide/show frame
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    Reporter:  erikos                     |          Owner:  erikos  
        Type:  task                       |         Status:  new     
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98    
   Component:  sugar                      |        Version:  0.97.x  
    Severity:  Blocker                    |       Keywords:          
Distribution:  OLPC                       |   Status_field:  Assigned
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 Two parts are needed for that:

 ===toolkit===
 We need to add API to allow for tracking global gestures, this will be in
 the sugar-toolkit-gtk3, the API will be available through SugarExt,
 similar to the KeyGrabber we listen on the root window for the events. We
 then filter for gestures recognized by
 an event controller.

 You can add any event controller of the ones recently
 added to the toolkit to be tracked and can pass a
 specific area where the starting point of the gesture
 should be, it's then allowed to go out of bounds as
 it moves.

 ===shell===
 We need to listen on the gesture grabber and hide/show the Frame
 accordingly. See view/keyhandler.py

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3981>
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