88 lines
2.2 KiB
XML
88 lines
2.2 KiB
XML
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<sect1 id="Private_Header_File">
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<title>Private Header File</title>
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<para>
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<!-- .LP -->
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The private header file contains the complete declaration of the class
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and instance structures for the widget and any additional private data
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that will be required by anticipated subclasses of the widget.
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Information in the private header file is normally hidden from the
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application and is designed to be accessed only through other public
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procedures; e.g.
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<function>XtSetValues .</function>
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</para>
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<para>
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<!-- .LP -->
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The contents of the Template private header file,
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<function>< X11/Xaw/TemplateP.h >, </function>
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are:
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</para>
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<!-- .CB -->
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<!-- .\".so ../../lib/Xaw/TemplateP.h -->
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<literallayout class="monospaced">
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/* Copyright (c) X Consortium 1987, 1988
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*/
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#ifndef _TemplateP_h
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#define _TemplateP_h
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#include <X11/Xaw/Template.h>
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/* include superclass private header file */
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#include <X11/CoreP.h>
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/* define unique representation types not found in <X11/StringDefs.h> */
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#define XtRTemplateResource "TemplateResource"
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typedef struct {
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int empty;
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} TemplateClassPart;
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typedef struct _TemplateClassRec {
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CoreClassPart core_class;
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TemplateClassPart template_class;
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} TemplateClassRec;
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extern TemplateClassRec templateClassRec;
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typedef struct {
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/* resources */
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char* resource;
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/* private state */
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} TemplatePart;
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typedef struct _TemplateRec {
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CorePart core;
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TemplatePart template;
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} TemplateRec;
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#endif /* _TemplateP_h */
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<!-- .CE -->
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</literallayout>
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<para>
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The private header file includes the private header file of its
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superclass, thereby exposing the entire internal structure of the widget.
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It may not always be advantageous to do this; your own project
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development style will dictate the appropriate level of detail to expose
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in each module.
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</para>
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<para>
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The "WindowWidget" needs to declare two fields in its instance structure to
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hold the drawing colors, a resource field for the font and a field for the
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expose and user input callback lists:
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</para>
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<literallayout class="monospaced">
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typedef struct {
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/* resources */
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Pixel color_1;
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Pixel color_2;
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XFontStruct* font;
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XtCallbackList expose_callback;
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XtCallbackList input_callback;
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/* private state */
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/* (none) */
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} WindowPart;
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</literallayout>
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</sect1>
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