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#ifndef lint
static char Xrcsid[] = "$XConsortium: Command.c,v 1.46 88/11/01 16:57:33 swick Exp $";
#endif lint

/***********************************************************
Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts,
and the Massachusetts Institute of Technology, Cambridge, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the names of Digital or MIT not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/


/*
 * Command.c - Command button widget
 *
 */

#define XtStrlen(s)	((s) ? strlen(s) : 0)

  /* The following are defined for the reader's convenience.  Any
     Xt..Field macro in this code just refers to some field in
     one of the substructures of the WidgetRec.  */

#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>
#include <stdio.h>
#include <ctype.h>
#include "RMCommandP.h"
#include "RMCommandI.h"

#define MIN(A,B)	(A < B ? A : B)

/****************************************************************
 *
 * Full class record constant
 *
 ****************************************************************/

/* Private Data */

static char defaultTranslations[] =
    "<EnterWindow>:	highlight()		\n\
     <LeaveWindow>:	reset()			\n\
     <Btn1Down>:	set()			\n\
     <Btn1Up>:		notify() unset()	";

#ifndef XtPointer
#define XtPointer	caddr_t
#endif

#define offset(field) XtOffset(RMCommandWidget, field)
static XtResource resources[] = { 

   {XtNcallback, XtCCallback, XtRCallback, sizeof(XtPointer), 
      offset(command.callbacks), XtRCallback, (XtPointer)NULL},
   {XtNhighlightThickness, XtCThickness, XtRDimension, sizeof(Dimension),
      offset(command.highlight_thickness), XtRImmediate, (XtPointer)2},
};
#undef offset

static XtActionsRec actionsList[] =
{
  {"set",		Set},
  {"notify",		Notify},
  {"highlight",		Highlight},
  {"reset",		Reset},
  {"unset",		Unset},
  {"unhighlight",	Unhighlight},
};

#define SuperClass ((LabelWidgetClass)&labelClassRec)

RMCommandClassRec RMcommandClassRec = {
  {
    (WidgetClass) SuperClass,		/* superclass		  */	
    "RMCommand",			/* class_name		  */
    sizeof(RMCommandRec),		/* 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	  */
    TRUE,				/* compress_exposure	  */
    TRUE,				/* compress_enterleave    */
    FALSE,				/* visible_interest	  */
    Destroy,				/* destroy		  */
    XtInheritResize,			/* resize		  */
    Redisplay,				/* expose		  */
    SetValues,				/* 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 */
  {
    XtInheritChangeSensitive		/* change_sensitive	*/
  },  /* SimpleClass fields initialization */
  {
    0,                                     /* field not used    */
  },  /* LabelClass fields initialization */
  {
    0,                                     /* field not used    */
  },  /* RMCommandClass fields initialization */
};

  /* for public consumption */
WidgetClass RMcommandWidgetClass = (WidgetClass) &RMcommandClassRec;

/****************************************************************
 *
 * Private Procedures
 *
 ****************************************************************/

static GC Get_GC(cbw, fg, bg)
    RMCommandWidget cbw;
    Pixel fg, bg;
{
    XGCValues	values;

    values.foreground   = fg;
    values.background	= bg;
    values.font		= ComWfont->fid;
    values.line_width   = ComWhighlightThickness > 1
			  ? ComWhighlightThickness : 0;

    return XtGetGC((Widget)cbw,
		   GCForeground | GCBackground | GCFont | GCLineWidth,
		   &values);
}


/* ARGSUSED */
static void Initialize(request, new)
 Widget request, new;
{
    RMCommandWidget cbw = (RMCommandWidget) new;

    ComWnormalGC = Get_GC(cbw, ComWforeground, ComWbackground);
    ComWinverseGC = Get_GC(cbw, ComWbackground, ComWforeground);
    XtReleaseGC(new, ComWlabelGC);
    ComWlabelGC = ComWnormalGC;

    ComWset = FALSE;
    ComWhighlighted = FALSE;
}

static Region HighlightRegion(cbw)
    RMCommandWidget cbw;
{
    static Region outerRegion = NULL, innerRegion, emptyRegion;
    XRectangle rect;

    if (outerRegion == NULL) {
	/* save time by allocating scratch regions only once. */
	outerRegion = XCreateRegion();
	innerRegion = XCreateRegion();
	emptyRegion = XCreateRegion();
    }

    rect.x = rect.y = 0;
    rect.width = cbw->core.width;
    rect.height = cbw->core.height;
    XUnionRectWithRegion( &rect, emptyRegion, outerRegion );
    rect.x = rect.y = ComWhighlightThickness;
    rect.width -= ComWhighlightThickness * 2;
    rect.height -= ComWhighlightThickness * 2;
    XUnionRectWithRegion( &rect, emptyRegion, innerRegion );
    XSubtractRegion( outerRegion, innerRegion, outerRegion );
    return outerRegion;
}


/***************************
*
*  Action Procedures
*
***************************/

/* ARGSUSED */
static void Set(w,event,params,num_params)
     Widget w;
     XEvent *event;
     String *params;		/* unused */
     Cardinal *num_params;	/* unused */
{
  RMCommandWidget cbw = (RMCommandWidget)w;
  if (!ComWset) {
      ComWset = TRUE;
      ComWlabelGC = ComWinverseGC;
      Redisplay(w, event, NULL);
  }
}

/* ARGSUSED */
static void Unset(w,event,params,num_params)
     Widget w;
     XEvent *event;
     String *params;		/* unused */
     Cardinal *num_params;
{
  RMCommandWidget cbw = (RMCommandWidget)w;
  if (ComWset) {
      ComWset = FALSE;
      ComWlabelGC = ComWnormalGC;
      XClearWindow( XtDisplay(w), XtWindow(w) );
      Redisplay(w, event, NULL);
  }
}

/* ARGSUSED */
static void Reset(w,event,params,num_params)
     Widget w;
     XEvent *event;
     String *params;		/* unused */
     Cardinal *num_params;
{
  RMCommandWidget cbw = (RMCommandWidget)w;
  if (ComWset) {
      ComWhighlighted = FALSE;
      Unset(w,event,params,num_params);
  }
  else {
      Unhighlight(w,event,params,num_params);
  }
}

/* ARGSUSED */
static void Highlight(w,event,params,num_params)
     Widget w;
     XEvent *event;
     String *params;		/* unused */
     Cardinal *num_params;	/* unused */
{
  RMCommandWidget cbw = (RMCommandWidget)w;
  if (!ComWhighlighted) {
      ComWhighlighted = TRUE;
      Redisplay(w, event, HighlightRegion(cbw));
  }
}

/* ARGSUSED */
static void Unhighlight(w,event,params,num_params)
     Widget w;
     XEvent *event;
     String *params;		/* unused */
     Cardinal *num_params;	/* unused */
{
  RMCommandWidget cbw = (RMCommandWidget)w;
  if (ComWhighlighted) {
      ComWhighlighted = FALSE;
      Redisplay(w, event, HighlightRegion(cbw));
  }
}

/* ARGSUSED */
static void Notify(w,event,params,num_params)
     Widget w;
     XEvent *event;
     String *params;		/* unused */
     Cardinal *num_params;	/* unused */
{
  RMCommandWidget cbw = (RMCommandWidget)w;
  if (ComWset)
      XtCallCallbacks(w, XtNcallback, NULL);
}
/*
 * Repaint the widget window
 */

/************************
*
*  REDISPLAY (DRAW)
*
************************/

/* ARGSUSED */
static void Redisplay(w, event, region)
    Widget w;
    XEvent *event;
    Region region;
{
   RMCommandWidget cbw = (RMCommandWidget) w;
   Boolean very_thick = ComWhighlightThickness > MIN(ComWwidth,ComWheight)/2;

   if (ComWset)
       XFillRectangle(XtDisplay(w), XtWindow(w), ComWnormalGC,
		      0, 0, ComWwidth, ComWheight);

   if (!ComWset &&
       (ComWhighlighted || event->xany.type != Expose) && /* This line added
							   * by GEB 12/14/88;
							   * This is NOT a
							   * "blessed" bug fix.
							   * So your milage may
							   * vary. */
       ComWhighlightThickness > 0) {
       if (very_thick) {
	   ComWlabelGC = ComWhighlighted ? ComWinverseGC : ComWnormalGC;
	   XFillRectangle(XtDisplay(w),XtWindow(w), 
			  (ComWhighlighted ? ComWnormalGC : ComWinverseGC),
			  0,0,ComWwidth,ComWheight);
       }
       else {
	   /* wide lines are centered on the path, so indent it */
	   int offset = ComWhighlightThickness/2;
	   XDrawRectangle(XtDisplay(w),XtWindow(w),
			  (ComWhighlighted ? ComWnormalGC : ComWinverseGC),
			  offset, offset,
			  ComWwidth - ComWhighlightThickness,
			  ComWheight - ComWhighlightThickness);
       }
   }

   (*SuperClass->core_class.expose) (w, event, region);
}


/* ARGSUSED */
static void Destroy(w)
    Widget w;
{
    RMCommandWidget cbw = (RMCommandWidget)w;
    ComWlabelGC = ComWnormalGC;	/* so Label can release it */
    XtReleaseGC( w, ComWinverseGC );
}


/*
 * Set specified arguments into widget
 */
/* ARGSUSED */
static Boolean SetValues (current, request, new)
    Widget current, request, new;
{
    RMCommandWidget oldcbw = (RMCommandWidget) current;
    RMCommandWidget cbw = (RMCommandWidget) new;
    Boolean redisplay = False;

    if (XtCField(oldcbw,sensitive) != ComWsensitive && !ComWsensitive) {
	/* about to become insensitive */
	ComWset = FALSE;
	ComWhighlighted = FALSE;
    }

    if (XtLField(oldcbw,foreground) != ComWforeground ||
	XtCField(oldcbw, background_pixel) != ComWbackground ||
	XtCBField(oldcbw,highlight_thickness) != ComWhighlightThickness ||
	XtLField(oldcbw,font) != ComWfont)
    {
	if (ComWset)		/* Label has release one of these */
	    XtReleaseGC(new, ComWnormalGC);
	else
	    XtReleaseGC(new, ComWinverseGC);
	ComWnormalGC = Get_GC(cbw, ComWforeground, ComWbackground);
	ComWinverseGC = Get_GC(cbw, ComWbackground, ComWforeground);
	redisplay = True;
    }

    ComWlabelGC = ComWset ? ComWinverseGC : ComWnormalGC;

    return (redisplay ||
	    XtCField(oldcbw, sensitive) != ComWsensitive ||
	    XtCBField(oldcbw, set) != ComWset ||
	    XtCBField(oldcbw, highlighted) != ComWhighlighted);
}
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