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authormarha <marha@users.sourceforge.net>2011-03-25 15:37:13 +0000
committermarha <marha@users.sourceforge.net>2011-03-25 15:37:13 +0000
commit41a502478a2972358dec934d82ee401c61a5cd36 (patch)
tree3fda8100e6da9b4a2863789e393016a750502067 /libXaw/spec/Template
parent81aeaf653a832c4054d9a40b1cc796911521a739 (diff)
parent272e57235cd60a2e65ac8258d96a02eb3939b687 (diff)
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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