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

       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 control.  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 UControlInteractors to help define their look and
       feel if Unidraw's keyboard equivalent mechanism is not needed.

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

Control(3I), ControlInfo(3U), Graphic(3U), GraphicComp(3U), GraphicView(3U), KeyMap(3U)

Unidraw                                         20 November 1990                                    UControl(3U)

#include<Unidraw/uctrl.h>

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

virtualvoidSetControlInfo(ControlInfo*)ControlInfo*GetControlInfo()
              Assign and retrieve the UControl's ControlInfo object.

UControlInteractor(ControlInfo*)UControlInteractor()
              UControlInteractor defines two protected constructors.  One takes the ControlInfo object to use as
              an argument.  This constructor also initializes the UControlInteractor's _label  protected  member
              by calling InitLabel (described below) with the ControlInfo object.  The parameterless constructor
              initializes  _label  to  nil.   Both  constructors  initialize  the  UControlInteractor's _picture
              protected  member  to  point  to  an  instance  of   a   Picture   object,   which   defines   the
              UControlInteractor's appearance.

       virtualvoidInvert()
              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
              UControlInteractor's appearance.  This  operation  creates  a  GraphicView  of  the  ControlInfo's
              GraphicComp and returns a copy of the view's graphic.

virtualvoidSetControlInfo(ControlInfo*)ControlInfo*GetControlInfo()
              Assign and retrieve the UControlInteractor's ControlInfo object.

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