UControl,  UControlInteractor  - base classes for menu and
       button interfaces that work with ControlInfo objects

SYNOPSIS

       #include <Unidraw/uctrl.h>

DESCRIPTION

       UControl is an abstract class  that  augments  InterViews'
       Control  base  class  to  deal  with Unidraw's ControlInfo
       objects, which define a keyboard equivalent for  the  con-
       trol.   UControlInteractor  is  an abstract base class for
       interactors that base their appearance on the  information
       in  a  ControlInfo  object.   UControl  subclasses can use
       UControlInteractor subclasses to define their  appearance.

       Unidraw-based applications needn't use UControls and UCon-
       trolInteractors to help define  their  look  and  feel  if
       Unidraw's keyboard equivalent mechanism is not needed.

UCONTROL PUBLIC OPERATIONS

       virtual void SetControlInfo(ControlInfo*)
       ControlInfo* GetControlInfo()
              Assign  and  retrieve  the  UControl's  ControlInfo
              object.

UCONTROL PROTECTED OPERATIONS

       UControl(ControlInfo*)
       UControl(const char*, ControlInfo*)
              UControl provides protected constructors  that  let
              subclasses  initialize  the  ControlInfo object and
              optionally specify their instance name.

UCONTROLINTERACTOR PUBLIC OPERATIONS

       virtual void SetControlInfo(ControlInfo*)
       ControlInfo* GetControlInfo()
              Assign and retrieve the  UControlInteractor's  Con-
              trolInfo object.

       virtual void Highlight(boolean)
              The UControlInteractor's appearance is defined by a
              Graphic object, which it builds from information in
              its ControlInfo object.  By default, UControlInter-
              actor highlights itself  by  drawing  this  graphic
              with its foreground and background colors reversed.

UCONTROLINTERACTOR PROTECTED OPERATIONS

       UControlInteractor(ControlInfo*)
       UControlInteractor()
              UControlInteractor defines two protected  construc-
              tors.   One  takes the ControlInfo object to use as
              an argument.  This constructor also initializes the
              UControlInteractor's  _label  protected  member  by
              initializes _label to nil.  Both constructors  ini-
              tialize the UControlInteractor's _picture protected
              member to point to an instance of a Picture object,
              which  defines the UControlInteractor's appearance.

       virtual void Invert()
              Invert reverses _picture's colors  without  drawing
              it.

       Graphic* InitLabel(ControlInfo*)
              Create  a  graphic from the information stored in a
              ControlInfo object that defines the  UControlInter-
              actor's   appearance.   This  operation  creates  a
              GraphicView of the  ControlInfo's  GraphicComp  and
              returns a copy of the view's graphic.

SEE ALSO

       Control(3I),    ControlInfo(3U),   Graphic(3U),   Graphic-
       Comp(3U), GraphicView(3U), KeyMap(3U)