The generic function calculate-layout is called by the CAPI to layout the children of a layout. When defining a new class of layout using define-layout, a calculate-layout method must be provided that sets the
x
,
y
,
width
and
height
of each of the layout's children. This method must try to obey the constraints specified by its children (its minimum and maximum size) and should only break them when it becomes impossible to fit the constraints of all of the children.
To set the
x
,
y
,
width
and
height
of the layout, use the macro with-geometry which works in a similar way as with-slots.
CAPI User Guide and Reference Manual (Macintosh version) - 3 Aug 2017