man(1) Manual page archive


     PREFAB-INTRO(2)                                   PREFAB-INTRO(2)

     NAME
          Prefab: intro - Interactive TV tookit

     SYNOPSIS
          include "draw.m";
          include "prefab.m";
          prefab := load Prefab Prefab->PATH;

     DESCRIPTION
          The Prefab module contains components for building graphics
          objects suitable for Interactive Television (ITV) applica-
          tions using infrared remote controls.  Using the Draw
          module's operations for simple text and images (see draw-
          intro(2)), the toolkit can group individual items, treat
          those groups as units, and then activate the items on com-
          mand.  The other user interface toolkit, tk(2), provides
          facilities for keyboard- and mouse-driven applications.

          The objects on the screen are of type Compound, each of
          which occupies a unique window on the display and contains
          objects of type Element.  An Element may be a single object
          or a list of further Elements, to build hierarchically
          structured components.

          Prefab defines Environ and Style types that specify the
          appearance of objects: their colours, fonts, backgrounds,
          and so on.  A Style gives font and colour information, while
          an Environ identifies the Screen upon which the items will
          be displayed and the Style in which they will be drawn.

          Applications should allocate Elements and Compounds only
          through the appropriate member functions, as described in
          the corresponding sections of the manual.  Items created
          with regular Limbo definitions will not work properly.
          Moreover, except where indicated, applications should not
          modify the data members directly.  Although the type defini-
          tions make data members visible, the members should usually
          be treated as read-only data.

     SOURCE
          /libinterp/prefab.c
          /libprefab/*.c

     SEE ALSO
          draw-intro(2), ir(2)