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Function: GgiViewport

Purpose: Create a Ggi viewport element

Category: USER-INTERFACE

File: ggi.src

Author: J.P. Terlouw

Use:
#include "ggi.h"
ident viewport;
char *name;
int width, height;

viewport = GgiViewport(keyword, width, height);

viewport - 'handle' by which the element can be referenced.
keyword - the viewport's user input keyword.
width - the viewport's horizontal size.
height - the viewport's vertical size.

Description: GgiViewport creates a viewport element. A viewport element can
be used as a container for any number of other Ggi elements.
These elements are positioned relative to the viewport's left
and top edge or relative to other elements within the same
viewport. If the contents of a viewport do not fit in any
dimension, scrollbars will be added to it so that the user
can move to any part of the contents.

If width or height is specified as zero, that dimension of the
viewport will be just large enough to enclose its initial
contents.

The keyword can be used to control or inquire which part of the
viewport's contents is shown. It represents the center of the
displayed part in normalized coordinates from (0,0) to (1,1).
(0,0) is the upper left and (1,1) the lower right corner.
E.g. if the keyword would be VIEWPOS=, then specifying
VIEWPOS= 0.5 0.5 would cause the central part of the contents to
be displayed. After the keyword has been modified at least once,
manipulating the viewport's scrollbars will cause the keyword
to be updated. The keyword can then be read to obtain the current
display position.

If a viewport element is deleted, all elements contained by it
will be deleted automatically.

Related document:
GgiUseShell.dc2

Updates: Nov 2, 1999: JPT, Document created.
Oct 9, 2001: JPT, Implemented keyword.