By Mr. Brian J. Keller
A realistic consultant to X Window Programming is a easy advisor that takes readers step-by-step via constructing functions utilizing X-Windows™. The ebook covers the Xt Intrinsics part of the X-Window procedure intimately and discusses the MIT Athena and OSF/Motif Widget units which are utilized in a number of the examples. themes coated comprise C programming basics, textual content dealing with utilizing X, fonts, occasion dealing with in Xt, extending the Widget units (building on box Editor Widget), designing and developing an program, construction menus, printing support, OSF/Motif (including the window arranger) and interclient communique. 3 wide appendices are integrated: Widgets, Classing, and Exported capabilities; speedy Xt Reference consultant (X11R4); and speedy consultant to OSF/Motif Widgets. Any purposes dressmaker drawn to constructing purposes with Xt will locate this publication a worthwhile and enlightening source.
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Extra resources for A Practical Guide To X Window Programming: Developing Applications with the XT Intrinsics and OSF/Motif
If the superclass had a superclass, its CorePart would point to it, and so on. html (2 of 4) [13/12/02 18:08:43] A Practical Guide to X Window Programming: Developing Applications with ... 4. A Windowless Object: The OSF/Motif Gadget As of X11R4, the Core widget has been split into two components: Object and RectObj. , destruction methods). , x,y coordinates and height). There is also a third part often referred to as WindowObj, which is used by many widget sets, although it is not defined by the X11R4 Intrinsics.
The ones we care most about are fid, direction, min_bounds, max_bounds, ascent, descent, and per_char. The “fid” is the font id used to refer to the font, “direction” indicates which way the characters are defined, “mill_bounds” is the bounding box of the smallest character, “max_bounds” is the bounding box of the largest character, “ascent” tells how far above the baseline the font is, “descent” tells how far below the baseline the font is, and “per_char” is the array of XCharStruct structures for each character in the font.
It implies that writing new widgets can be simply a matter of adding a few things rather than rewriting the entire code. In Chapter 2 you reviewed how pointers and structures work — a pointer is nothing more than a place in memory, an address. With this address you can peer into the actual locations to get and update the information stored there. Since a structure is nothing more than an organization of members in a contiguous block, if you have a pointer to a structure and the structure’s definition, you can access each member.
A Practical Guide To X Window Programming: Developing Applications with the XT Intrinsics and OSF/Motif by Mr. Brian J. Keller