Mr. Brian J. Keller's A Practical Guide To X Window Programming: Developing PDF

By Mr. Brian J. Keller

ISBN-10: 0849374065

ISBN-13: 9780849374067

A pragmatic consultant to X Window Programming is a easy consultant that takes readers step-by-step via constructing functions utilizing X-Windows™. The booklet covers the Xt Intrinsics component of the X-Window process intimately and discusses the MIT Athena and OSF/Motif Widget units which are utilized in a few of the examples. issues coated contain 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 verbal exchange. 3 broad appendices are integrated: Widgets, Classing, and Exported features; fast Xt Reference consultant (X11R4); and speedy advisor to OSF/Motif Widgets. Any purposes dressmaker drawn to constructing purposes with Xt will locate this ebook a useful and enlightening source.

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Extra info for A Practical Guide To X Window Programming: Developing Applications with the XT Intrinsics and OSF/Motif

Sample text

The Class Part of a Widget The class (ClassPart) is the thing that binds the mechanism together. It allows for inheritance of superclass methods and data via a pointer to the superclass’s class record. Through this pointer, new widgets may use the superclass’s code as if it were their own. This notion is quite powerful. 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.

M, p, c 98, etc. iso8859, etc. 1, etc. The registry is an X registered name that tells you who owns the remaining part of the syntax and semantics that make up the remainder of the name; the foundry tells who provided it; family is the typeface; weight is the appearance; slant is either r (upright), o (oblique), i (italic), ri (reverse italic), ro (reverse oblique), or ot (other); pointsize tells how big it is, spacing is either m (mono), p (proportional), or c (charcell); avgwidth tells the average width of the characters; and charsetregistry tells what body the font is registered with.

4. Loading Fonts Most of the Xt Intrinsics hide the details of many of the graphic elements, either through the resource management or via the built-in converters (see Chapter 6). Though these conveniences are nice, you should be aware of some of the routines for loading and unloading fonts. To load a font, use one of the following: XLoadFont(dpy,name); or XLoadQueryFont(dpy,name); XLoadFont()returns a font id to be used. It will look for the font and have it loaded. XLoadQueryFont() does the same thing except that it will return an XFontStruct.

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A Practical Guide To X Window Programming: Developing Applications with the XT Intrinsics and OSF/Motif by Mr. Brian J. Keller


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