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101
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     1  | 
LayoutManager
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     2  | 
  VerticalLayout
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     3  | 
  HorizontalLayout
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     4  | 
  TileLayout
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     5  | 
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     6  | 
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     7  | 
events:
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     8  | 
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     9  | 
  draw()
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    10  | 
    - caller
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    11  | 
  on_draw()
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    12  | 
    - core handler, for overloading
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    13  | 
  connect('draw', my_draw)
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    14  | 
    - additional handler
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    15  | 
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    16  | 
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    17  | 
Focus
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    18  | 
-----
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    19  | 
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    20  | 
 * only one node in hierarchy can have focus
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    21  | 
 * all parent containers have focus, so they can relay events to child
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    22  | 
 * top container has always focus
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    23  | 
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    24  | 
 * grab_focus() on any node will clean old focus and set focus to this child
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    25  | 
 * global shortcuts can be handled in keypress handler of top widget
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