1 LayoutManager

     2   VerticalLayout

     3   HorizontalLayout

     4   TileLayout

     5 

     6 

     7 events:

     8 

     9   draw()

    10     - caller

    11   on_draw()

    12     - core handler, for overloading

    13   connect('draw', my_draw)

    14     - additional handler

    15 

    16 

    17 Focus

    18 -----

    19 

    20  * only one node in hierarchy can have focus

    21  * all parent containers have focus, so they can relay events to child

    22  * top container has always focus

    23 

    24  * grab_focus() on any node will clean old focus and set focus to this child

    25  * global shortcuts can be handled in keypress handler of top widget