compound - windows for ITV toolkit — Inferno 1ed

compound - windows for ITV toolkit

include "draw.m";
include "prefab.m";
prefab:= load Prefab Prefab->PATH;
Compound: adt
{
  image:   ref Draw->Image;
  environ: ref Environ;
  r:       Draw->Rect;
  title:   ref Element;
  contents:ref Element;
 
  iconbox:  fn(env: ref Environ,
               p: Draw->Point, title: string, icon,
               mask: ref Draw->Image) :ref Compound;
  textbox:  fn(env: ref Environ,
               r: Draw->Rect, title, text: string):
                      ref Compound;
  layoutbox: fn(env: ref Environ,
               r: Draw->Rect, title: string, lay: 
                    list of Layout) :ref Compound;
  box:    fn(env: ref Environ, p: Draw->Point, title, elist:
                    ref Element):ref Compound;
  draw:   fn(comp: self ref Compound);
  redraw: fn(comp: self ref Compound, r: Draw->Rect);
  scroll: fn(comp: self ref Compound, elem: ref Element, 
                       d: Draw->Point);
  show: fn(comp: self ref Compound, elem: ref Element): int;
  select:  fn(comp: self ref Compound,
             elem: ref Element, i: int, c: chan of int):
             (int, int, ref Element);
  tagselect: fn(comp: self ref Compound,
             elem: ref Element, i: int, c: chan of int):
            (int, int, ref Element);
  highlight: fn(comp: self ref Compound,
       elem: ref Element, on: int);
};

Description

Compound is the abstract data type that defines boxes drawn on the screen. Each appears in a new window, Compound.image, and holds a (possibly nil) title and contents. Element. It occupies the space on the screen defined by Compound.r. Allocating a Compound creates a window but does not draw it; after the Compound is built, Compound.draw must be called to make it visible. Compounds have a border around them, drawn in Style.edgecolor and contain, from top-to-bottom, the title (if any), a horizontal line (if there is a title), and the contents.

Compound.iconbox (env, p, title, icon, mask)

Creates a Compound whose contents are made by calling Element.icon (see elem - elementary functions of applied mathematics in Chapter 14) using the icon and mask. The Compound 's upper left corner is at p. Its size is determined by the size of the icon and mask.


element	The element is contained in the Compound, and may be at any level of its structure. It is most usefully a list, but may be a singleton, in which case it behaves like a list of one element.
index	The number of the element on the list
c	The channel, c, is a chan of int connected to an IR remote control interface, typically acquired through the program's Context (see context - graphics environment in Chapter 11).

The arrow keys on the remote control scroll through the members of the list, using the Style.highlightcolor associated with each member element to indicate selection. A Select key on the remote control triggers select to return a tuple (key, index, elem), where:


key	The key member is the key code of the action (here Select).
index	The index member is the number of the element in the list (ignoring separators).
elem	The elem member is the list member highlighted when the key was hit.