By Keith D. Gregory

About this booklet This booklet is a close advent to programming with the OSF /MotifI'M graphical consumer interface. it's an creation in that it doesn't require the reader to have event programming within the X Window surroundings. it's unique in that it teaches you ways to exploit the interface parts supplied by way of Motif in a posh program. even though it features a good deal of reference fabric, it isn't intended as an authoritative reference - that's the task of the OSF/Motif Programmer's Reference, which makes use of over 900 pages within the method. as a substitute, this e-book offers its reference fabric in a realistic, "how to" demeanour and permits the reader to take advantage of the Programmer's Reference successfully. the objective reader is an skilled C programmer and consumer of the X Window approach less than the UNIX working method. 'the reader may be accustomed to the instruments supplied through UNIX for the compilation and trying out of courses; whereas this publication does learn the method during which a Motif software is compiled, it doesn't clarify that approach. It additionally assumes that the reader understands "x" phrases akin to 'pointer' and 'display'.

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Core provides the basic window functionality, XmPrimitive prOvides appearance details, and XmLabel provides facilities for text or pixmap display. 1. 1 to be most often used. 1. Frequently used resources: XmLabel Name Type Inheritance Default Value alignment XmLabel unsigned char XmALIGNMENT_CENTER fontList XmLabel XmFontL i st "Fixed" labelPixmap XmLabel Pixmap labelString XmLabel XmString XmUNSPECIFIED - PIXMAP dynamic labelType XmLabel unsigned char XmSTRING recomputeSize XmLabel Boolean TRUE string Direction XmLabel XmString Direction foreground XmPrimitive Pixel XmSTRING - DIRECTION - LTO_R dynamic unitType XmPrimitive unsigned char background Core Pi xe 1 XmPIXELS dynamic height Core Dimension 0 width Core Dimension 0 x y Core Pos it ion 0 Core Position 0 Usage: labelType The XmLabel class is capable of displaying two types of labels: text and picture.

10 36 Programming with Motif The third variant includes the Programmer's Workbench library (PW). This library contains regular expression code; it is only needed for System-V-based systems and then only when you are using XmFileSelectionBox, which is described in Chapter 13. If you are using a BSD-derived system (such as Ultrix), the contents of this library are part of the standard C library. The order of library specifications is important because the C compiler will search libraries in the order specified.

Wrtting A Motif Program 31 its parent is realized. This means that you could realize appshell immediately after creating it, and all of its descendents would be realized as they are managed. 6 Tfie drawback to this approach is lower efficiency: realizing all widgets in one step results in less client-server communication than realizing each widget as it is managed. The Event Loop This is the stage where a program spends most of its time. 5, is typically the last statement in a program's rna in function.

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