/* DrawingA.c: The DrawingArea Widget Methods */

/* Copyright 1990, David Nedde
 *
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without fee
 * is granted provided that the above copyright notice appears in all copies.
 * It is provided "as is" without express or implied warranty.
 */

#include <X11/IntrinsP.h>
#include <X11/StringDefs.h>
#include <X11/CoreP.h>
#include <X11/Xaw/SimpleP.h>
#include "DrawingP.h"

static void	Initialize();
static void	Destroy();
static void	Redisplay();
static void	input_draw();
static void	motion_draw();
static void	resize_draw();

static char defaultTranslations[] = "<BtnDown>: input() \n <BtnUp>: input() \n <KeyDown>: input() \n <KeyUp>: input() \n <Motion>: motion() \n <Configure>: resize()";
static XtActionsRec actionsList[] = {
  { "input",  (XtActionProc)input_draw },
  { "motion", (XtActionProc)motion_draw },
  { "resize", (XtActionProc)resize_draw },
};

/* Default instance record values */
static XtResource resources[] = {
  {XtNexposeCallback, XtCCallback, XtRCallback, sizeof(caddr_t),
     XtOffset(DrawingAreaWidget, drawing_area.expose_callback), 
     XtRCallback, NULL },
  {XtNinputCallback, XtCCallback, XtRCallback, sizeof(caddr_t),
     XtOffset(DrawingAreaWidget, drawing_area.input_callback), 
     XtRCallback, NULL },
  {XtNmotionCallback, XtCCallback, XtRCallback, sizeof(caddr_t),
     XtOffset(DrawingAreaWidget, drawing_area.motion_callback), 
     XtRCallback, NULL },
  {XtNresizeCallback, XtCCallback, XtRCallback, sizeof(caddr_t),
     XtOffset(DrawingAreaWidget, drawing_area.resize_callback), 
     XtRCallback, NULL },
};


DrawingAreaClassRec drawingAreaClassRec = {
  /* CoreClassPart */
{
  (WidgetClass) &simpleClassRec,	/* superclass		  */	
    "DrawingArea",			/* class_name		  */
    sizeof(DrawingAreaRec),		/* size			  */
    NULL,				/* class_initialize	  */
    NULL,				/* class_part_initialize  */
    FALSE,				/* class_inited		  */
    Initialize,				/* initialize		  */
    NULL,				/* initialize_hook	  */
    XtInheritRealize,			/* realize		  */
    actionsList,			/* actions		  */
    XtNumber(actionsList),		/* num_actions		  */
    resources,				/* resources		  */
    XtNumber(resources),		/* resource_count	  */
    NULLQUARK,				/* xrm_class		  */
    FALSE,				/* compress_motion	  */
    FALSE,				/* compress_exposure	  */
    TRUE,				/* compress_enterleave    */
    FALSE,				/* visible_interest	  */
    Destroy,				/* destroy		  */
    NULL,				/* resize		  */
    Redisplay,				/* expose		  */
    NULL,				/* set_values		  */
    NULL,				/* set_values_hook	  */
    XtInheritSetValuesAlmost,		/* set_values_almost	  */
    NULL,				/* get_values_hook	  */
    NULL,				/* accept_focus		  */
    XtVersion,				/* version		  */
    NULL,				/* callback_private	  */
    defaultTranslations,		/* tm_table		  */
    XtInheritQueryGeometry,		/* query_geometry	  */
    XtInheritDisplayAccelerator,	/* display_accelerator	  */
    NULL				/* extension		  */
  },  /* CoreClass fields initialization */
  {
    /* change_sensitive		*/	XtInheritChangeSensitive
  },  /* SimpleClass fields initialization */
  {
    0,                                     /* field not used    */
  },  /* DrawingAreaClass fields initialization */
};

  
WidgetClass drawingAreaWidgetClass = (WidgetClass)&drawingAreaClassRec;


static void Initialize( request, new)
DrawingAreaWidget request, new;
{
  if (request->core.width == 0)
    new->core.width = 100;
  if (request->core.height == 0)
    new->core.height = 100;
}




static void Destroy( w)
DrawingAreaWidget w;
{
  XtRemoveAllCallbacks((Widget)w, XtNexposeCallback);
  XtRemoveAllCallbacks((Widget)w, XtNinputCallback);
  XtRemoveAllCallbacks((Widget)w, XtNmotionCallback);
  XtRemoveAllCallbacks((Widget)w, XtNresizeCallback);
}


/* Invoke expose callbacks */
static void Redisplay(w, event, region)
DrawingAreaWidget w;
XEvent		 *event;
Region		  region;
{
  XawDrawingAreaCallbackStruct cb;

  cb.reason = XawCR_EXPOSE;
  cb.event  = event;
  cb.window = XtWindow(w);
  XtCallCallbacks((Widget)w, XtNexposeCallback, (char *)&cb);
}

/* Invoke resize callbacks */
static void resize_draw(w, event, args, n_args)
DrawingAreaWidget w;
XEvent		 *event;
char		 *args[];
int		  n_args;
{
  XawDrawingAreaCallbackStruct cb;

  cb.reason = XawCR_RESIZE;
  cb.event  = event;
  cb.window = XtWindow(w);
  XtCallCallbacks((Widget)w, XtNresizeCallback, (char *)&cb);
}

/* Invoke input callbacks */
static void input_draw(w, event, args, n_args)
DrawingAreaWidget w;
XEvent		 *event;
char		 *args[];
int		  n_args;
{
  XawDrawingAreaCallbackStruct cb;

  cb.reason = XawCR_INPUT;
  cb.event  = event;
  cb.window = XtWindow(w);
  XtCallCallbacks((Widget)w, XtNinputCallback, (char *)&cb);
}

/* Invoke motion callbacks */
static void motion_draw(w, event, args, n_args)
DrawingAreaWidget w;
XEvent		 *event;
char		 *args[];
int		  n_args;
{
  XawDrawingAreaCallbackStruct cb;

  cb.reason = XawCR_MOTION;
  cb.event  = event;
  cb.window = XtWindow(w);
  XtCallCallbacks((Widget)w, XtNmotionCallback, (char *)&cb);
}
