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) applications 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 command.
The other user interface toolkit, tk(2), provides facilities for key‐
board- 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 sec‐
tions 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 ALSOdraw-intro(2), ir(2)PREFAB-INTRO(2)
