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

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},{ /* template fields *//* empty */ 0}};Creating New Widgets(Subclassing)WidgetClass templateWidgetClass = (WidgetClass)&templateClassRec;The resource list for the "WindowWidget" might look like the following:static XtResource resources[] = {#define offset(field) XtOffsetOf(WindowWidgetRec, window.field)/* {name, class, type, size, offset, default_type, default_addr}, */{ XtNdrawingColor1, XtCColor, XtRPixel, sizeof(Pixel),offset(color_1), XtRString, XtDefaultForeground },{ XtNdrawingColor2, XtCColor, XtRPixel, sizeof(Pixel),offset(color_2), XtRString, XtDefaultForeground },{ XtNfont, XtCFont, XtRFontStruct, sizeof(XFontStruct*),offset(font), XtRString, XtDefaultFont },{ XtNexposeCallback, XtCCallback, XtRCallback, sizeof(XtCallbackList),offset(expose_callback), XtRCallback, NULL },{ XtNcallback, XtCCallback, XtRCallback, sizeof(XtCallbackList),offset(input_callback), XtRCallback, NULL },#undef offset};The user input callback will be implemented by an action procedure which passesthe event pointer as call_data. The action procedure is declared as:/* ARGSUSED */static void InputAction(w, event, params, num_params)Widget w;XEvent *event;String *params; /* unused */Cardinal *num_params; /* unused */{XtCallCallbacks(w, XtNcallback, (XtPointer)event);}static XtActionsRec actions[] ={/* {name, procedure}, */{"input", InputAction},};and the default input binding will be to execute the input callbacks on KeyPressand ButtonPress :static char translations[] =" : input(\|) \\n\\: input(\|) \\";133
Creating New Widgets(Subclassing)In the class record declaration and initialization, the only field that is different fromthe Template is the expose procedure:/* ARGSUSED */static void Redisplay(w, event, region)Widget w;XEvent *event; /* unused */Region region;{XtCallCallbacks(w, XtNexposeCallback, (XtPointer)region);}WindowClassRec windowClassRec = {.../* expose */ Redisplay,The "WindowWidget" will also declare three public procedures to return the drawingcolors and the font id, saving the application the effort of constructing an argumentlist for a call to XtGetValues :Pixel WindowColor1(w)Widget w;{return ((WindowWidget)w)->window.color_1;}Pixel WindowColor2(w)Widget w;{return ((WindowWidget)w)->window.color_2;}Font WindowFont(w)Widget w;{return ((WindowWidget)w)->window.font->fid;}The "WindowWidget" is now complete. The application can retrieve the two drawingcolors from the widget instance by calling either XtGetValues , or the WindowColorfunctions. The actual window created for the "WindowWidget" is available by callingthe XtWindow function.134
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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
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Text Widgetsint XawTextReplace( w,
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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 and 134: Creating New Widgets(Subclassing)It
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Page 137: Creating New Widgets(Subclassing)st
Page 141: AcknowledgmentsDonna ConverseMIT X
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Athena Widget Set - C Language Interface - X Consortium ... - X.Org

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