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       Box, HBox, VBox - tile interactors in a box


       #include <InterViews/box.h>


       A  box  is  a  scene  of  interactors  that are tiled side-by-side in the available space.
       Interactors are placed left-to-right in a horizontal box, and top-to-bottom in a  vertical

       A  box will try to stretch or shrink the interactors inside it to fit the available space.
       The natural size of a box is the sum of its elements along the major axis, and the maximum
       along  its  minor axis.  A box's stretchability (shrinkability) is the sum of its elements
       along its major axis and the minimum of its elements along its minor axis.


              Create a new box.  Zero to seven  interactors  may  be  passed  as  arguments;  the
              interactors are inserted into the box.

       void Align(Alignment)
              Set  the  alignment  mode that the box uses to place elements along the minor axis.
              The default alignment for an hbox is Bottom; other choices are Top and Center.  The
              default alignment for a vbox is Left; other choices are Right and Center.

       void Insert(Interactor*)
              Append an interactor to the box.  Components of an hbox (vbox) will appear left-to-
              right (top-to-bottom) in the order in which they are inserted.

       void Change(Interactor*)
              Notify  the  box  that  the  given  interactor's  shape  has  changed.   If  change
              propagation  is  true,  the box will modify its own shape to reflect the change and
              notify its parent.  Regardless of propagation, the box will recompute the positions
              of the component interactors and update any that have changed.

       void Remove(Interactor*)
              Take  an  element  of out a box.  Remove does not cause any immediate change to the
              other components in the box; the Change operation must be called after one or  more
              Removes to update the component positions.


       Glue(3I), Interactor(3I), Scene(3I), Shape(3I)