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authormarha <marha@users.sourceforge.net>2009-11-06 06:59:46 +0000
committermarha <marha@users.sourceforge.net>2009-11-06 06:59:46 +0000
commitace7902333b6f61aab5a6035dbcb222763bff186 (patch)
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+.\" $Xorg: Template,v 1.3 2000/08/17 19:42:28 cpqbld Exp $
+All Athena widgets have three separate files associated with them:
+.LP
+.IP \(bu 3
+A \*Qpublic\*U header file containing declarations needed by
+applications programmers
+.IP \(bu 3
+A \*Qprivate\*U header file containing additional declarations needed by the
+widget and any subclasses
+.IP \(bu 3
+A source code file containing the implementation of the widget
+.LP
+This separation of functions into three files is suggested for all
+widgets, but nothing in the Toolkit actually requires this format. In
+particular, a private widget created for a single application may easily
+combine the \*Qpublic\*U and \*Qprivate\*U header files into a single file, or
+merge the contents into another application header file. Similarly, the
+widget implementation can be merged into other application code.
+.LP
+.sp
+In the following example, the public header file
+.Pn < X11/Xaw/Template.h >,
+the private header file
+.Pn < X11/Xaw/TemplateP.h >
+and the source code file
+.Pn < X11/Xaw/Template.c >
+will be modified to produce the \*QWindowWidget\*U described above.
+In each case, the files have been designed so that a global string
+replacement of ``Template'' and ``template''
+with the name of your new widget, using
+the appropriate case, can be done.
+.NH 2
+Public Header File
+.LP
+The public header file contains declarations that will be required by any
+application module that needs to refer to the widget; whether to create
+an instance of the class, to perform an
+.PN XtSetValues
+operation, or to call a public routine implemented by the widget class.
+.LP
+The contents of the Template public header file,
+.Pn < X11/Xaw/Template.h >,
+are:
+.de CB
+.sp
+.Ds 0
+.SM
+.vs 10
+.in +.25i
+.TA .25i 1.4i 2.4i 2.75i 3.5i
+.ta .25i 1.4i 2.4i 2.75i 3.5i
+..
+.de CE
+.NL
+.vs 13
+.De
+.\".in -.25i
+..
+.CB
+.\".so ../../lib/Xaw/Template.h
+/* XConsortium: Template.h,v 1.2 88/10/25 17:22:09 swick Exp $ */
+/* Copyright (c) X Consortium 1987, 1988 */
+
+#ifndef _Template_h
+#define _Template_h
+
+/****************************************************************
+ *
+ * Template widget
+ *
+ ****************************************************************/
+
+/* Resources:
+
+ Name Class RepType Default Value
+ ---- ----- ------- -------------
+ background Background Pixel XtDefaultBackground
+ border BorderColor Pixel XtDefaultForeground
+ borderWidth BorderWidth Dimension 1
+ destroyCallback Callback Pointer NULL
+ height Height Dimension 0
+ mappedWhenManaged MappedWhenManaged Boolean True
+ sensitive Sensitive Boolean True
+ width Width Dimension 0
+ x Position Position 0
+ y Position Position 0
+
+*/
+
+/* define any special resource names here that are not in <X11/StringDefs.h> */
+
+#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 */
+.CE
+.LP
+.sp
+You will notice that most of this file is documentation. The crucial
+parts are the last 8 lines where macros for any private resource names
+and classes are defined and where the widget class datatypes and class
+record pointer are declared.
+.LP
+For the \*QWindowWidget\*U, we want 2 drawing colors, a callback list for
+user input and an
+\fBexposeCallback\fP callback list, and we will declare three
+convenience procedures, so we need to add
+.LP
+.sp
+.CB
+/* Resources:
+ ...
+ callback Callback Callback NULL
+ drawingColor1 Color Pixel XtDefaultForeground
+ drawingColor2 Color Pixel XtDefaultForeground
+ exposeCallback Callback Callback NULL
+ font Font XFontStruct* XtDefaultFont
+ ...
+ */
+
+#define XtNdrawingColor1 "drawingColor1"
+#define XtNdrawingColor2 "drawingColor2"
+#define XtNexposeCallback "exposeCallback"
+
+extern Pixel WindowColor1(\|/* Widget */\|);
+extern Pixel WindowColor2(\|/* Widget */\|);
+extern Font\ \ WindowFont(\|/* Widget */\|);
+.CE
+.LP
+Note that we have chosen to call the input callback list by the generic
+name, \fBcallback\fP, rather than a specific name. If widgets that define
+a single user-input action all choose the same resource name then there
+is greater possibility for an application to switch between widgets of
+different types.
+.NH 2
+Private Header File
+.LP
+The private header file contains the complete declaration of the class
+and instance structures for the widget and any additional private data
+that will be required by anticipated subclasses of the widget.
+Information in the private header file is normally hidden from the
+application and is designed to be accessed only through other public
+procedures; e.g.
+.PN XtSetValues .
+.LP
+The contents of the Template private header file,
+.Pn < X11/Xaw/TemplateP.h >,
+are:
+.CB
+.\".so ../../lib/Xaw/TemplateP.h
+/* XConsortium: TemplateP.h,v 1.2 88/10/25 17:31:47 swick Exp $ */
+
+/* Copyright (c) X Consortium 1987, 1988
+ */
+
+#ifndef _TemplateP_h
+#define _TemplateP_h
+
+#include <X11/Xaw/Template.h>
+/* include superclass private header file */
+#include <X11/CoreP.h>
+
+/* define unique representation types not found in <X11/StringDefs.h> */
+
+#define XtRTemplateResource "TemplateResource"
+
+typedef struct {
+ int empty;
+} TemplateClassPart;
+
+typedef struct _TemplateClassRec {
+ CoreClassPart core_class;
+ TemplateClassPart template_class;
+} TemplateClassRec;
+
+extern TemplateClassRec templateClassRec;
+
+typedef struct {
+ /* resources */
+ char* resource;
+ /* private state */
+} TemplatePart;
+
+typedef struct _TemplateRec {
+ CorePart core;
+ TemplatePart template;
+} TemplateRec;
+
+#endif /* _TemplateP_h */
+.CE
+.LP
+.sp
+The private header file includes the private header file of its
+superclass, thereby exposing the entire internal structure of the widget.
+It may not always be advantageous to do this; your own project
+development style will dictate the appropriate level of detail to expose
+in each module.
+.LP
+The \*QWindowWidget\*U needs to declare two fields in its instance structure to
+hold the drawing colors, a resource field for the font and a field for the
+expose and user input callback lists:
+.CB
+typedef struct {
+ /* resources */
+ Pixel color_1;
+ Pixel color_2;
+ XFontStruct* font;
+ XtCallbackList expose_callback;
+ XtCallbackList input_callback;
+ /* private state */
+ /* (none) */
+} WindowPart;
+.CE
+.NH 2
+Widget Source File
+.LP
+The source code file implements the widget class itself. The unique
+part of this file is the declaration and initialization of the
+widget class record structure and the declaration of all resources and
+action routines added by the widget class.
+.LP
+The contents of the Template implementation file,
+.Pn < X11/Xaw/Template.c >,
+are:
+.CB
+.\".so ../../lib/Xaw/Template.c
+/* XConsortium: Template.c,v 1.2 88/10/25 17:40:25 swick Exp $ */
+
+/* Copyright (c) X Consortium 1987, 1988
+ */
+
+#include <X11/IntrinsicP.h>
+#include <X11/StringDefs.h>
+#include "TemplateP.h"
+
+static XtResource resources[] = {
+#define offset(field) XtOffsetOf(TemplateRec, template.field)
+ /* {name, class, type, size, offset, default_type, default_addr}, */
+ { XtNtemplateResource, XtCTemplateResource, XtRTemplateResource,
+ sizeof(char*), offset(resource), XtRString, (XtPointer) "default" },
+#undef offset
+};
+
+static void TemplateAction(/* Widget, XEvent*, String*, Cardinal* */);
+
+static XtActionsRec actions[] =
+{
+ /* {name, procedure}, */
+ {"template", TemplateAction},
+};
+
+static char translations[] =
+" <Key>: template(\|) \\n\\
+";
+
+TemplateClassRec templateClassRec = {
+ { /* core fields */
+ /* superclass */ (WidgetClass) &widgetClassRec,
+ /* class_name */ "Template",
+ /* widget_size */ sizeof(TemplateRec),
+ /* class_initialize */ NULL,
+ /* class_part_initialize */ NULL,
+ /* class_inited */ FALSE,
+ /* initialize */ NULL,
+ /* initialize_hook */ NULL,
+ /* realize */ XtInheritRealize,
+ /* actions */ actions,
+ /* num_actions */ XtNumber(actions),
+ /* resources */ resources,
+ /* num_resources */ XtNumber(resources),
+ /* xrm_class */ NULLQUARK,
+ /* compress_motion */ TRUE,
+ /* compress_exposure */ TRUE,
+ /* compress_enterleave */ TRUE,
+ /* visible_interest */ FALSE,
+ /* destroy */ NULL,
+ /* resize */ NULL,
+ /* expose */ NULL,
+ /* set_values */ NULL,
+ /* set_values_hook */ NULL,
+ /* set_values_almost */ XtInheritSetValuesAlmost,
+ /* get_values_hook */ NULL,
+ /* accept_focus */ NULL,
+ /* version */ XtVersion,
+ /* callback_private */ NULL,
+ /* tm_table */ translations,
+ /* query_geometry */ XtInheritQueryGeometry,
+ /* display_accelerator */ XtInheritDisplayAccelerator,
+ /* extension */ NULL
+ },
+ { /* template fields */
+ /* empty */ 0
+ }
+};
+
+WidgetClass templateWidgetClass = (WidgetClass)&templateClassRec;
+
+.CE
+The resource list for the \*QWindowWidget\*U might look like the following:
+.CB
+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
+};
+.CE
+.LP
+The user input callback will be implemented by an action procedure which
+passes the event pointer as call_data. The action procedure
+is declared as:
+.CB
+/* 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},
+};
+.CE
+.LP
+and the default input binding will be to execute the input callbacks on
+.PN KeyPress
+and
+.PN ButtonPress :
+.LP
+.CB
+static char translations[] =
+" <Key>: input(\|) \\n\\
+ <BtnDown>: input(\|) \\
+";
+.CE
+.LP
+In the class record declaration and initialization, the only field that
+is different from the Template is the expose procedure:
+.CB
+/* ARGSUSED */
+static void Redisplay(w, event, region)
+ Widget w;
+ XEvent *event; /* unused */
+ Region region;
+{
+ XtCallCallbacks(w, XtNexposeCallback, (XtPointer)region);
+}
+
+WindowClassRec windowClassRec = {
+
+ ...
+
+ /* expose */ Redisplay,
+.CE
+.LP
+.sp
+The \*QWindowWidget\*U will also declare three public procedures to return the
+drawing colors and the font id, saving the application the effort of
+constructing an argument list for a call to
+.PN XtGetValues :
+.LP
+.CB
+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;
+}
+.CE
+.LP
+The \*QWindowWidget\*U is now complete. The application can retrieve the two
+drawing colors from the widget instance by calling either
+.PN XtGetValues ,
+or the \fBWindowColor\fP functions. The actual window created for the
+\*QWindowWidget\*U is available by calling the
+.PN XtWindow
+function.
+.ds LH
+.ds CH
+.ds RH
+.nr PN +1
+.XS
+Index
+.XE
+.tm .pn \n(PN
+.nr PN -1
+.\" print Table of Contents
+.if o .bp \" blank page to make count even
+.bp 3
+.af PN i
+.PX