Athena Widget Set - C Language Interface - X Consortium ... - X.Org

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Creating New Widgets(Subclassing)* Template widget*****************************************************************//* Resources:Name Class RepType Default Value---- ----- ------- -------------background Background Pixel XtDefaultBackgroundborder BorderColor Pixel XtDefaultForegroundborderWidth BorderWidth Dimension 1destroyCallback Callback Pointer NULLheight Height Dimension 0mappedWhenManaged MappedWhenManaged Boolean Truesensitive Sensitive Boolean Truewidth Width Dimension 0x Position Position 0y Position Position 0*//* define any special resource names here that are not in */#define XtNtemplateResource "templateResource"#define XtCTemplateResource "TemplateResource"/* declare specific TemplateWidget class and instance datatypes */typedef struct _TemplateClassRec* TemplateWidgetClass;typedef struct _TemplateRec* TemplateWidget;/* declare the class constant */extern WidgetClass templateWidgetClass;#endif /* _Template_h */You will notice that most of this file is documentation. The crucial parts are the last8 lines where macros for any private resource names and classes are defined andwhere the widget class datatypes and class record pointer are declared.For the "WindowWidget", we want 2 drawing colors, a callback list for user input andan exposeCallback callback list, and we will declare three convenience procedures,so we need to add/* Resources:...callback Callback Callback NULL129
Creating New Widgets(Subclassing)drawingColor1 Color Pixel XtDefaultForegrounddrawingColor2 Color Pixel XtDefaultForegroundexposeCallback Callback Callback NULLfont Font XFontStruct* XtDefaultFont...*/#define XtNdrawingColor1 "drawingColor1"#define XtNdrawingColor2 "drawingColor2"#define XtNexposeCallback "exposeCallback"extern Pixel WindowColor1(\|/* Widget */\|);extern Pixel WindowColor2(\|/* Widget */\|);extern Font\ \ WindowFont(\|/* Widget */\|);Note that we have chosen to call the input callback list by the generic name, callback,rather than a specific name. If widgets that define a single user-input actionall choose the same resource name then there is greater possibility for an applicationto switch between widgets of different types.Private Header FileThe private header file contains the complete declaration of the class and instancestructures for the widget and any additional private data that will be required byanticipated subclasses of the widget. Information in the private header file is normallyhidden from the application and is designed to be accessed only through otherpublic procedures; e.g. XtSetValues .The contents of the Template private header file, < X11/Xaw/TemplateP.h >, are:/* Copyright (c) X Consortium 1987, 1988*/#ifndef _TemplateP_h#define _TemplateP_h#include /* include superclass private header file */#include /* define unique representation types not found in */#define XtRTemplateResource "TemplateResource"typedef struct {int empty;} TemplateClassPart;typedef struct _TemplateClassRec {CoreClassPart core_class;TemplateClassPart template_class;} TemplateClassRec;130
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Athena Widget Set -C Language Inter
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Table of Contents1. Athena Widgets
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Athena Widget Set -C Language Inter
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Athena Widgetsand The Intrinsicswid
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Athena Widgetsand The Intrinsics•
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Athena Widgetsand The IntrinsicsDRD
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Using Widgetsapplication_classoptio
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Using WidgetsName Class Type Defaul
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Using Widgetsapp_contextSpecifies t
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Using Widgetsnum_argsSpecifies the
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Using Widgets6. When the argument l
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Using Widgetseither the name used t
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Using WidgetsArg arglist[10];arglis
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Simple WidgetsSuperclass LabelResou
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Simple Widgets• Processing applic
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Simple WidgetsName Class Type Notes
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Simple WidgetsResourceswill allow i
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Simple WidgetsResourcesWhen creatin
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Simple WidgetsforegroundA pixel val
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Simple WidgetsresizeSpecifies a Boo
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Simple WidgetssliderWidthPanner Act
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Simple WidgetsRepeater ActionsThe R
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Simple Widgetsbacks and passes eith
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Simple WidgetsSimple Widget\ * reso
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Simple WidgetsResourcesThe StripCha
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Simple Widgetsvoid(*getValueProc)(
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Simple Widgetsnotify()When the Togg
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Chapter 4. MenusThe Athena widget s
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MenusNotify(\|)Called when the user
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MenusleftBitmaprightBitmapThis is a
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Chapter 5. Text WidgetsThe Text wid
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Text Widgetswill be insensitive and
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Text WidgetsTwoThreeFourFiveSelect
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Text Widgetsscroll-one-line-up()scr
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Text Widgetskill-to-end-of-paragrap
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Text Widgetsreconnect-im()The popup
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Text WidgetsText FunctionsLeft: bac
Page 83 and 84: Text Widgetsint XawTextReplace( w,
Page 85 and 86: Text WidgetsCalling this function i
Page 87 and 88: Text WidgetsClass Header fileClassC
Page 89 and 90: Text WidgetsResourcesClass Name Tex
Page 91 and 92: Text WidgetsClearing Portions of th
Page 93 and 94: Text WidgetsFinding the Size of the
Page 95 and 96: Text WidgetsXawTextPosition Read( w
Page 97 and 98: Text Widgetstypevalue_returnlength_
Page 99 and 100: Text WidgetsResourcesSuperclass Tex
Page 101 and 102: Text WidgetsBoolean XawAsciiSaveAsF
Page 103 and 104: Text WidgetsName Class Type Notes D
Page 105 and 106: Chapter 6. Composite and Constraint
Page 107 and 108: Composite and ConstraintWidgetsName
Page 111 and 112: Composite and ConstraintWidgetsLayo
Page 113 and 114: Composite and ConstraintWidgets{Wid
Page 117 and 118: Composite and ConstraintWidgetsAppl
Page 123 and 124: Composite and ConstraintWidgets: Gr
Page 125 and 126: Composite and ConstraintWidgetsReso
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Page 131 and 132: Composite and ConstraintWidgetsLayo
Page 133: Creating New Widgets(Subclassing)It
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Page 139 and 140: Creating New Widgets(Subclassing)In
Page 141: AcknowledgmentsDonna ConverseMIT X
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Athena Widget Set - C Language Interface - X Consortium ... - X.Org

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