[Bugs] #3565 sugar-artwork UNSP: Theme scroll button in the tray

[Sugar Labs Bugs]

#3565: Theme scroll button in the tray
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    Reporter:  erikos                     |          Owner:  manuq            
        Type:  defect                     |         Status:  assigned         
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98             
   Component:  sugar-artwork              |        Version:  Git as of bugdate
    Severity:  Major                      |       Keywords:                   
Distribution:  Unspecified                |   Status_field:  New              
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Comment(by manuq):

 Sugar trays are gtk boxes that pack buttons in both ends, and a gtk
 viewport in the middle.  The viewport packs a gtk toolbar.

 What we need here is 1. paint the background of those boxes, and 2. style
 the buttons.

 For 2 we just need to add the __gtype_name__ and the attached patch does
 so.

 For 1 we have to convert the boxes to EventBoxes because otherwise the
 background is not themeable:
 https://bugzilla.gnome.org/show_bug.cgi?id=678790

 I did so in the attached patch but now I have an issue in the
 _size_allocate_cb of _TrayViewport:

 {{{
 (tray.py:18161): Gtk-WARNING **: gtk_widget_size_allocate(): attempt to
 allocate widget with width -1280350453 and height 1
 }}}

 So I need fix that.  Then, a patch for artwork is trivial.

 Runing the testcase in toolkit-gtk3 tests/graphics/test.py is being useful
 to work on this.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3565#comment:3>
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