Skip to Main Content
Volume 7A: XView Programming Manual
book

Volume 7A: XView Programming Manual

by Dan Heller
October 1994
Intermediate to advanced content levelIntermediate to advanced
770 pages
22h 58m
English
O'Reilly Media, Inc.
Content preview from Volume 7A: XView Programming Manual
25.4 XView Packages
Earlier, we introduced the concept of XView methods and how they are used to define the in-
teraction between a particular class and the XView intrinsics. These methods, along with a
set of attributes, macros, types, and functions, collectively make up an XView package. The
XView library is made up of statically subclassed (pre-built) packages representing user in-
terface objects.
25.4.1 The Xv_pkg Type
Packages (and thus, classes) are declared by creating a global variable of type Xv_pkg. This
package is defined in <xview/pkg_public.h> as:
typedef struct _xview_pkg {
char *name;
Attr_attribute attr_id;
unsigned size_of_object;
struct _xview_pkg *parent_pkg;
int (*init)();
Xv_opaque (*set)();
Xv_opaque (*get)();
int (*destroy)();
Xv_object (*find)();
} Xv_pkg;
The fields of the Xv_pkg type are declared and used as follows:
name The name of the package is a unique, descriptive string. This is useful
for debugging the ERROR package, and it may also be used in the fu-
ture to implement resource handling from the resource database.
Therefore, it should not contain whitespace or dots (periods). Under-
scores and hyphens are allowed, but should be avoided for aesthetic
reasons. A combination of uppercase and lowercase letters should be
used to imply multi-word names (e.g., “DigitalClock”).
attr_id This is the ID of the package. It is set to a unique number and is used
in attributes’ values to ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Volume 6A: Motif Programming Manual

Volume 6A: Motif Programming Manual

David Brennan, Dan Heller, Paula Ferguson
Java™ Media APIs: Cross-Platform Imaging, Media, and Visualization

Java™ Media APIs: Cross-Platform Imaging, Media, and Visualization

Alejandro Terrazas, John Ostuni, Michael Barlow

Publisher Resources

ISBN: 9780937175873