#2713 HIGH Trial-3: Add paging arrows to the activities frame

[Zarro Boogs per Child]

#2713: Add paging arrows to the activities frame
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  Reporter:  tomeu             |       Owner:  marco  
      Type:  defect            |      Status:  new    
  Priority:  high              |   Milestone:  Trial-3
 Component:  interface-design  |     Version:         
Resolution:                    |    Keywords:  review-
  Verified:  0                 |  
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Comment (by marco):

 I'm going to list several high level issue. Let's address these and then
 we can review the patch in the detail.

  * I don't think we need item-width, item-height, page-limit. We should
 just scroll the viewport of one page, regardless from his content.
  * set_content is not the kind of API we want. Given Eben explanations in
 previous comments, I'd say to create a TrayButton object (which inherits
 from ToolButton). The viewport should contain a Toolbar and we should have
 add_item(item, index), remove_item(index) which will pack TrayButtons into
 it. Later we might want to add TrayObject/TrayItem for non clickable
 objects.
  * We should use Animation/Animator for the animation. Should end up with
 cleaner code and we can tweak animation ease as suggested by Eben.
  * Packing ToolItems inside a HBox is probably bad, they are supposed to
 be packed only inside toolbars afaik. We can just create two toolbars
 (let/right) and add those to the box.
  * Please add a test for this widget to tests/
  * Forget about the empty space at the end problem you mentioned by mail
 for now. I have a couple of ideas about it but it's going to be tricky, we
 can address that in a second step. Just scroll to the end of the viewport
 for the last page.

 I think the code should end up being pretty simple. Please follow up if
 you have any question or doubt.

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Ticket URL: <http://dev.laptop.org/ticket/2713#comment:7>
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