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[xemacs-hg @ 2002-05-28 08:44:22 by ben] merge my stderr-proc ws make-docfile.c: Fix places where we forget to check for EOF. code-init.el: Don't use CRLF conversion by default on process output. CMD.EXE and friends work both ways but Cygwin programs don't like the CRs. code-process.el, multicast.el, process.el: Removed. Improvements to call-process-internal: -- allows a buffer to be specified for input and stderr output -- use it on all systems -- implement C-g as documented -- clean up and comment call-process-region uses new call-process facilities; no temp file. remove duplicate funs in process.el. comment exactly how coding systems work and fix various problems. open-multicast-group now does similar coding-system frobbing to open-network-stream. dumped-lisp.el, faces.el, msw-faces.el: Fix some hidden errors due to code not being defined at the right time. xemacs.mak: Add -DSTRICT. ================================================================ ALLOW SEPARATION OF STDOUT AND STDERR IN PROCESSES ================================================================ Standard output and standard error can be processed separately in a process. Each can have its own buffer, its own mark in that buffer, and its filter function. You can specify a separate buffer for stderr in `start-process' to get things started, or use the new primitives: set-process-stderr-buffer process-stderr-buffer process-stderr-mark set-process-stderr-filter process-stderr-filter Also, process-send-region takes a 4th optional arg, a buffer. Currently always uses a pipe() under Unix to read the error output. (#### Would a PTY be better?) sysdep.h, sysproc.h, unexfreebsd.c, unexsunos4.c, nt.c, emacs.c, callproc.c, symsinit.h, sysdep.c, Makefile.in.in, process-unix.c: Delete callproc.c. Move child_setup() to process-unix.c. wait_for_termination() now only needed on a few really old systems. console-msw.h, event-Xt.c, event-msw.c, event-stream.c, event-tty.c, event-unixoid.c, events.h, process-nt.c, process-unix.c, process.c, process.h, procimpl.h: Rewrite the process methods to handle a separate channel for error input. Create Lstreams for reading in the error channel. Many process methods need change. In general the changes are fairly clear as they involve duplicating what's used for reading the normal stdout and changing for stderr -- although tedious, as such changes are required throughout the entire process code. Rewrote the code that reads process output to do two loops, one for stdout and one for stderr. gpmevent.c, tooltalk.c: set_process_filter takes an argument for stderr. ================================================================ NEW ERROR-TRAPPING MECHANISM ================================================================ Totally rewrite error trapping code to be unified and support more features. Basic function is call_trapping_problems(), which lets you specify, by means of flags, what sorts of problems you want trapped. these can include -- quit -- errors -- throws past the function -- creation of "display objects" (e.g. buffers) -- deletion of already-existing "display objects" (e.g. buffers) -- modification of already-existing buffers -- entering the debugger -- gc -- errors->warnings (ala suspended errors) etc. All other error funs rewritten in terms of this one. Various older mechanisms removed or rewritten. window.c, insdel.c, console.c, buffer.c, device.c, frame.c: When creating a display object, added call to note_object_created(), for use with trapping_problems mechanism. When deleting, call check_allowed_operation() and note_object deleted(). The trapping-problems code records the objects created since the call-trapping-problems began. Those objects can be deleted, but none others (i.e. previously existing ones). bytecode.c, cmdloop.c: internal_catch takes another arg. eval.c: Add long comments describing the "five lists" used to maintain state (backtrace, gcpro, specbind, etc.) in the Lisp engine. backtrace.h, eval.c: Implement trapping-problems mechanism, eliminate old mechanisms or redo in terms of new one. frame.c, gutter.c: Flush out the concept of "critical display section", defined by the in_display() var. Use an internal_bind() to get it reset, rather than just doing it at end, because there may be a non-local exit. event-msw.c, event-stream.c, console-msw.h, device.c, dialog-msw.c, frame.c, frame.h, intl.c, toolbar.c, menubar-msw.c, redisplay.c, alloc.c, menubar-x.c: Make use of new trapping-errors stuff and rewrite code based on old mechanisms. glyphs-widget.c, redisplay.h: Protect calling Lisp in redisplay. insdel.c: Protect hooks against deleting existing buffers. frame-msw.c: Use EQ, not EQUAL in hash tables whose keys are just numbers. Otherwise we run into stickiness in redisplay because internal_equal() can QUIT. ================================================================ SIGNAL, C-G CHANGES ================================================================ Here we change the way that C-g interacts with event reading. The idea is that a C-g occurring while we're reading a user event should be read as C-g, but elsewhere should be a QUIT. The former code did all sorts of bizarreness -- requiring that no QUIT occurs anywhere in event-reading code (impossible to enforce given the stuff called or Lisp code invoked), and having some weird system involving enqueue/dequeue of a C-g and interaction with Vquit_flag -- and it didn't work. Now, we simply enclose all code where we want C-g read as an event with {begin/end}_dont_check_for_quit(). This completely turns off the mechanism that checks (and may remove or alter) C-g in the read-ahead queues, so we just get the C-g normal. Signal.c documents this very carefully. cmdloop.c: Correct use of dont_check_for_quit to new scheme, remove old out-of-date comments. event-stream.c: Fix C-g handling to actually work. device-x.c: Disable quit checking when err out. signal.c: Cleanup. Add large descriptive comment. process-unix.c, process-nt.c, sysdep.c: Use QUIT instead of REALLY_QUIT. It's not necessary to use REALLY_QUIT and just confuses the issue. lisp.h: Comment quit handlers. ================================================================ CONS CHANGES ================================================================ free_cons() now takes a Lisp_Object not the result of XCONS(). car and cdr have been renamed so that they don't get used directly; go through XCAR(), XCDR() instead. alloc.c, dired.c, editfns.c, emodules.c, fns.c, glyphs-msw.c, glyphs-x.c, glyphs.c, keymap.c, minibuf.c, search.c, eval.c, lread.c, lisp.h: Correct free_cons calling convention: now takes Lisp_Object, not Lisp_Cons chartab.c: Eliminate direct use of ->car, ->cdr, should be black box. callint.c: Rewrote using EXTERNAL_LIST_LOOP to avoid use of Lisp_Cons. ================================================================ USE INTERNAL-BIND-* ================================================================ eval.c: Cleanups of these funs. alloc.c, fileio.c, undo.c, specifier.c, text.c, profile.c, lread.c, redisplay.c, menubar-x.c, macros.c: Rewrote to use internal_bind_int() and internal_bind_lisp_object() in place of whatever varied and cumbersome mechanisms were formerly there. ================================================================ SPECBIND SANITY ================================================================ backtrace.h: - Improved comments backtrace.h, bytecode.c, eval.c: Add new mechanism check_specbind_stack_sanity() for sanity checking code each time the catchlist or specbind stack change. Removed older prototype of same mechanism. ================================================================ MISC ================================================================ lisp.h, insdel.c, window.c, device.c, console.c, buffer.c: Fleshed out authorship. device-msw.c: Correct bad Unicode-ization. print.c: Be more careful when not initialized or in fatal error handling. search.c: Eliminate running_asynch_code, an FSF holdover. alloc.c: Added comments about gc-cons-threshold. dialog-x.c: Use begin_gc_forbidden() around code to build up a widget value tree, like in menubar-x.c. gui.c: Use Qunbound not Qnil as the default for gethash. lisp-disunion.h, lisp-union.h: Added warnings on use of VOID_TO_LISP(). lisp.h: Use ERROR_CHECK_STRUCTURES to turn on ERROR_CHECK_TRAPPING_PROBLEMS and ERROR_CHECK_TYPECHECK lisp.h: Add assert_with_message. lisp.h: Add macros for gcproing entire arrays. (You could do this before but it required manual twiddling the gcpro structure.) lisp.h: Add prototypes for new functions defined elsewhere.
author ben
date Tue, 28 May 2002 08:45:36 +0000
parents b39c14581166
children 0dfff19d20da
line wrap: on
line source

/* Gauge Widget for XEmacs.
   Copyright (C) 1999 Edward A. Falk

This file is part of XEmacs.

XEmacs is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

XEmacs is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with XEmacs; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* Synched up with: Gauge.c 1.2 */

/*
 * Gauge.c - Gauge widget
 *
 * Author: Edward A. Falk
 *         falk@falconer.vip.best.com
 *
 * Date:   July 9, 1997
 *
 * Note: for fun and demonstration purposes, I have added selection
 * capabilities to this widget.  If you select the widget, you create
 * a primary selection containing the current value of the widget in
 * both integer and string form.  If you copy into the widget, the
 * primary selection is converted to an integer value and the gauge is
 * set to that value.
 */

/* TODO:  display time instead of value
 */

#define	DEF_LEN	50	/* default width (or height for vertical gauge) */
#define	MIN_LEN	10	/* minimum reasonable width (height) */
#define	TIC_LEN	6	/* length of tic marks */
#define	GA_WID	3	/* width of gauge */
#define	MS_PER_SEC 1000

#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <X11/IntrinsicP.h>
#include <X11/Xatom.h>
#include <X11/StringDefs.h>
#include ATHENA_XawInit_h_
#include "xlwgaugeP.h"
#include "../src/xmu.h"
#ifdef HAVE_XMU
#include <X11/Xmu/Atoms.h>
#include <X11/Xmu/Drawing.h>
#include <X11/Xmu/StdSel.h>
#endif


/****************************************************************
 *
 * Gauge resources
 *
 ****************************************************************/


static	char	defaultTranslations[] =
	"<Btn1Up>:	select()\n\
	 <Key>F1:	select(CLIPBOARD)\n\
	 <Btn2Up>:	paste()\n\
	 <Key>F2:	paste(CLIPBOARD)" ;



#define offset(field) XtOffsetOf(GaugeRec, field)
static XtResource resources[] = {
    {XtNvalue, XtCValue, XtRInt, sizeof(int),
	offset(gauge.value), XtRImmediate, (XtPointer)0},
    {XtNminValue, XtCMinValue, XtRInt, sizeof(int),
	offset(gauge.v0), XtRImmediate, (XtPointer)0},
    {XtNmaxValue, XtCMaxValue, XtRInt, sizeof(int),
	offset(gauge.v1), XtRImmediate, (XtPointer)100},
    {XtNntics, XtCNTics, XtRInt, sizeof(int),
	offset(gauge.ntics), XtRImmediate, (XtPointer) 0},
    {XtNnlabels, XtCNLabels, XtRInt, sizeof(int),
	offset(gauge.nlabels), XtRImmediate, (XtPointer) 0},
    {XtNlabels, XtCLabels, XtRStringArray, sizeof(String *),
	offset(gauge.labels), XtRStringArray, NULL},
    {XtNautoScaleUp, XtCAutoScaleUp, XtRBoolean, sizeof(Boolean),
	offset(gauge.autoScaleUp), XtRImmediate, FALSE},
    {XtNautoScaleDown, XtCAutoScaleDown, XtRBoolean, sizeof(Boolean),
	offset(gauge.autoScaleDown), XtRImmediate, FALSE},
    {XtNorientation, XtCOrientation, XtROrientation, sizeof(XtOrientation),
	offset(gauge.orientation), XtRImmediate, (XtPointer)XtorientHorizontal},
    {XtNupdate, XtCInterval, XtRInt, sizeof(int),
	offset(gauge.update), XtRImmediate, (XtPointer)0},
    {XtNgetValue, XtCCallback, XtRCallback, sizeof(XtPointer),
	offset(gauge.getValue), XtRImmediate, (XtPointer)NULL},
};
#undef offset



	/* member functions */

static void GaugeClassInit (void);
static void GaugeInit (Widget, Widget, ArgList, Cardinal *);
static void GaugeDestroy (Widget);
static void GaugeResize (Widget);
static void GaugeExpose (Widget, XEvent *, Region);
static Boolean GaugeSetValues (Widget, Widget, Widget, ArgList, Cardinal *);
static XtGeometryResult GaugeQueryGeometry (Widget, XtWidgetGeometry *,
					    XtWidgetGeometry *);

	/* action procs */

static void GaugeSelect (Widget, XEvent *, String *, Cardinal *);
static void GaugePaste  (Widget, XEvent *, String *, Cardinal *);

	/* internal privates */

static void GaugeSize (GaugeWidget, Dimension *, Dimension *, Dimension);
static void MaxLabel  (GaugeWidget, Dimension *, Dimension *,
		       Dimension *, Dimension *);
static void AutoScale     (GaugeWidget);
static void EnableUpdate  (GaugeWidget);
static void DisableUpdate (GaugeWidget);

static void GaugeGetValue (XtPointer, XtIntervalId *);
static void GaugeMercury (Display *, Window, GC, GaugeWidget, Cardinal, Cardinal);

static Boolean GaugeConvert (Widget, Atom *, Atom *, Atom *,
			     XtPointer *, unsigned long *, int *);
static void GaugeLoseSel (Widget, Atom *);
static void GaugeDoneSel (Widget, Atom *, Atom *);
static void GaugeGetSelCB (Widget, XtPointer, Atom *, Atom *,
			   XtPointer, unsigned long *, int *);

static GC Get_GC (GaugeWidget, Pixel);


static	XtActionsRec	actionsList[] =
{
  {"select",	GaugeSelect},
  {"paste",	GaugePaste},
} ;



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

GaugeClassRec gaugeClassRec = {
  {
/* core_class fields */
    /* superclass	  	*/	(WidgetClass) &labelClassRec,
    /* class_name	  	*/	"Gauge",
    /* widget_size	  	*/	sizeof(GaugeRec),
    /* class_initialize   	*/	GaugeClassInit,
    /* class_part_initialize	*/	NULL,
    /* class_inited       	*/	FALSE,
    /* initialize	  	*/	GaugeInit,
    /* initialize_hook		*/	NULL,
    /* realize		  	*/	XtInheritRealize,	/* TODO? */
    /* actions		  	*/	actionsList,
    /* num_actions	  	*/	XtNumber(actionsList),
    /* resources	  	*/	resources,
    /* num_resources	  	*/	XtNumber(resources),
    /* xrm_class	  	*/	NULLQUARK,
    /* compress_motion	  	*/	TRUE,
    /* compress_exposure  	*/	TRUE,
    /* compress_enterleave	*/	TRUE,
    /* visible_interest	  	*/	FALSE,
    /* destroy		  	*/	GaugeDestroy,
    /* resize		  	*/	GaugeResize,
    /* expose		  	*/	GaugeExpose,
    /* set_values	  	*/	GaugeSetValues,
    /* set_values_hook		*/	NULL,
    /* set_values_almost	*/	XtInheritSetValuesAlmost,
    /* get_values_hook		*/	NULL,
    /* accept_focus	 	*/	NULL,
    /* version			*/	XtVersion,
    /* callback_private   	*/	NULL,
    /* tm_table		   	*/	defaultTranslations,
    /* query_geometry		*/	GaugeQueryGeometry,
    /* display_accelerator	*/	XtInheritDisplayAccelerator,
    /* extension		*/	NULL
  },
/* Simple class fields initialization */
  {
    /* change_sensitive		*/	XtInheritChangeSensitive
  },
#ifdef	_ThreeDP_h
/* ThreeD class fields initialization */
  {
    XtInheritXaw3dShadowDraw	/* shadowdraw 		*/
  },
#endif
/* Label class fields initialization */
  {
    /* ignore 			*/	0
  },
/* Gauge class fields initialization */
  {
    /* extension		*/	NULL
  },
};

WidgetClass gaugeWidgetClass = (WidgetClass)&gaugeClassRec;




/****************************************************************
 *
 * Member Procedures
 *
 ****************************************************************/

static void
GaugeClassInit (void)
{
    XawInitializeWidgetSet();
#ifdef HAVE_XMU
    XtAddConverter(XtRString, XtROrientation, XmuCvtStringToOrientation,
    		NULL, 0) ;
#endif
}



/* ARGSUSED */
static void
GaugeInit (Widget   request,
	   Widget   new,
	   ArgList  args,
	   Cardinal *num_args)
{
    GaugeWidget gw = (GaugeWidget) new;

    if( gw->gauge.v0 == 0  &&  gw->gauge.v1 == 0 ) {
      gw->gauge.autoScaleUp = gw->gauge.autoScaleDown = TRUE ;
      AutoScale(gw) ;
    }

    /* If size not explicitly set, set it to our preferred size now.  */

    if( request->core.width == 0  ||  request->core.height == 0 )
    {
      Dimension w,h ;
      GaugeSize(gw, &w,&h, DEF_LEN) ;
      if( request->core.width == 0 )
	new->core.width = w ;
      if( request->core.height == 0 )
	new->core.height = h ;
      gw->core.widget_class->core_class.resize(new) ;
    }

    gw->gauge.selected = None ;
    gw->gauge.selstr = NULL ;

    if( gw->gauge.update > 0 )
      EnableUpdate(gw) ;

    gw->gauge.inverse_GC = Get_GC(gw, gw->core.background_pixel) ;
}

static void
GaugeDestroy (Widget w)
{
	GaugeWidget gw = (GaugeWidget)w;

	if( gw->gauge.selstr != NULL )
	  XtFree(gw->gauge.selstr) ;

	if( gw->gauge.selected != None )
	  XtDisownSelection(w, gw->gauge.selected, CurrentTime) ;

	XtReleaseGC(w, gw->gauge.inverse_GC) ;

	if( gw->gauge.update > 0 )
	  DisableUpdate(gw) ;
}


/* React to size change from manager.  Label widget will compute some
 * internal stuff, but we need to override.
 */

static void
GaugeResize (Widget w)
{
	GaugeWidget gw = (GaugeWidget)w;
	int	size ;		/* height (width) of gauge */
	int	vmargin ;	/* vertical (horizontal) margin */
	int	hmargin ;	/* horizontal (vertical) margin */

	vmargin = gw->gauge.orientation == XtorientHorizontal ?
	  gw->label.internal_height : gw->label.internal_width ;
	hmargin = gw->gauge.orientation == XtorientHorizontal ?
	  gw->label.internal_width : gw->label.internal_height ;

	/* TODO: need to call parent resize proc?  I don't think so since
	 * we're recomputing everything from scratch anyway.
	 */

	/* find total height (width) of contents */

	size = GA_WID+2 ;			/* gauge itself + edges */

	if( gw->gauge.ntics > 1 )		/* tic marks */
	  size += vmargin + TIC_LEN ;

	if( gw->gauge.nlabels > 1 )
	{
	  Dimension	lwm, lw0, lw1 ;	/* width of max, left, right labels */
	  Dimension	lh ;

	  MaxLabel(gw,&lwm,&lh, &lw0,&lw1) ;

	  if( gw->gauge.orientation == XtorientHorizontal )
	  {
	    gw->gauge.margin0 = lw0 / 2 ;
	    gw->gauge.margin1 = lw1 / 2 ;
	    size += lh + vmargin ;
	  }
	  else
	  {
	    gw->gauge.margin0 =
	    gw->gauge.margin1 = lh / 2 ;
	    size += lwm + vmargin ;
	  }
	}
	else
	  gw->gauge.margin0 = gw->gauge.margin1 = 0 ;

	gw->gauge.margin0 += hmargin ;
	gw->gauge.margin1 += hmargin ;

	/* Now distribute height (width) over components */

	if( gw->gauge.orientation == XtorientHorizontal )
	  gw->gauge.gmargin = (gw->core.height-size)/2 ;
	else
	  gw->gauge.gmargin = (gw->core.width-size)/2 ;

	gw->gauge.tmargin = gw->gauge.gmargin + GA_WID+2 + vmargin ;
	if( gw->gauge.ntics > 1 )
	  gw->gauge.lmargin = gw->gauge.tmargin + TIC_LEN + vmargin ;
	else
	  gw->gauge.lmargin = gw->gauge.tmargin ;
}

/*
 * Repaint the widget window
 */

/* ARGSUSED */
static void
GaugeExpose (Widget w,
	     XEvent *event,
	     Region region)
{
	GaugeWidget gw = (GaugeWidget) w;
register Display *dpy = XtDisplay(w) ;
register Window	win = XtWindow(w) ;
	GC	gc;	/* foreground, background */
	GC	gctop, gcbot ;	/* dark, light shadows */

	int	len ;		/* length (width or height) of widget */
	int	hgt ;		/* height (width) of widget */
	int	e0,e1 ;		/* ends of the gauge */
	int	x ;
	int	y ;		/* vertical (horizontal) position */
	int	i ;
	int	v0 = gw->gauge.v0 ;
	int	v1 = gw->gauge.v1 ;
	int	value = gw->gauge.value ;

	gc = XtIsSensitive(w) ? gw->label.normal_GC : gw->label.gray_GC ;


#ifdef	_ThreeDP_h
	gctop = gw->threeD.bot_shadow_GC ;
	gcbot = gw->threeD.top_shadow_GC ;
#else
	gctop = gcbot = gc ;
#endif

	if( gw->gauge.orientation == XtorientHorizontal ) {
	  len = gw->core.width ;
	  hgt = gw->core.height ;
	} else {
	  len = gw->core.height ;
	  hgt = gw->core.width ;
	}

	/* if the gauge is selected, signify by drawing the background
	 * in a contrasting color.
	 */

	if( gw->gauge.selected )
	{
	  XFillRectangle(dpy,win, gc, 0,0, w->core.width,w->core.height) ;
	  gc = gw->gauge.inverse_GC ;
	}

	e0 = gw->gauge.margin0 ;		/* left (top) end */
	e1 = len - gw->gauge.margin1 -1 ;	/* right (bottom) end */

	/* Draw the Gauge itself */

	y = gw->gauge.gmargin ;

	if( gw->gauge.orientation == XtorientHorizontal )	/* horizontal */
	{
	  XDrawLine(dpy,win,gctop, e0+1,y, e1-1,y) ;
	  XDrawLine(dpy,win,gctop, e0,y+1, e0,y+GA_WID) ;
	  XDrawLine(dpy,win,gcbot, e0+1, y+GA_WID+1, e1-1, y+GA_WID+1) ;
	  XDrawLine(dpy,win,gcbot, e1,y+1, e1,y+GA_WID) ;
	}
	else							/* vertical */
	{
	  XDrawLine(dpy,win,gctop, y,e0+1, y,e1-1) ;
	  XDrawLine(dpy,win,gctop, y+1,e0, y+GA_WID,e0) ;
	  XDrawLine(dpy,win,gcbot, y+GA_WID+1,e0+1, y+GA_WID+1, e1-1) ;
	  XDrawLine(dpy,win,gcbot, y+1,e1, y+GA_WID,e1) ;
	}


		/* draw the mercury */

	GaugeMercury(dpy, win, gc, gw, 0,value) ;


	if( gw->gauge.ntics > 1 )
	{
	  y = gw->gauge.tmargin ;
	  for(i=0; i<gw->gauge.ntics; ++i)
	  {
	    x = e0 + i*(e1-e0-1)/(gw->gauge.ntics-1) ;
	    if( gw->gauge.orientation == XtorientHorizontal ) {
	      XDrawLine(dpy,win,gcbot, x,y+1, x,y+TIC_LEN-2) ;
	      XDrawLine(dpy,win,gcbot, x,y, x+1,y) ;
	      XDrawLine(dpy,win,gctop, x+1,y+1, x+1,y+TIC_LEN-2) ;
	      XDrawLine(dpy,win,gctop, x,y+TIC_LEN-1, x+1,y+TIC_LEN-1) ;
	    }
	    else {
	      XDrawLine(dpy,win,gcbot, y+1,x, y+TIC_LEN-2,x) ;
	      XDrawLine(dpy,win,gcbot, y,x, y,x+1) ;
	      XDrawLine(dpy,win,gctop, y+1,x+1, y+TIC_LEN-2,x+1) ;
	      XDrawLine(dpy,win,gctop, y+TIC_LEN-1,x, y+TIC_LEN-1,x+1) ;
	    }
	  }
	}

	/* draw labels */
	if( gw->gauge.nlabels > 1 )
	{
	  char	label[20], *s = label ;
	  int	xlen, wd,h =0 ;

	  if( gw->gauge.orientation == XtorientHorizontal )
	    y = gw->gauge.lmargin + gw->label.font->max_bounds.ascent - 1 ;
	  else {
	    y = gw->gauge.lmargin ;
	    h = gw->label.font->max_bounds.ascent / 2 ;
	  }

	  for(i=0; i<gw->gauge.nlabels; ++i)
	  {
	    if( gw->gauge.labels == NULL )
	      sprintf(label, "%d", v0+i*(v1 - v0)/(gw->gauge.nlabels - 1)) ;
	    else
	      s = gw->gauge.labels[i] ;
	    if( s != NULL ) {
	      x = e0 + i*(e1-e0-1)/(gw->gauge.nlabels-1) ;
	      xlen = strlen(s) ;
	      if( gw->gauge.orientation == XtorientHorizontal ) {
		wd = XTextWidth(gw->label.font, s, xlen) ;
		XDrawString(dpy,win,gc, x-wd/2,y, s,xlen) ;
	      }
	      else {
		XDrawString(dpy,win,gc, y,x+h, s,xlen) ;
	      }
	    }
	  }
	}
}


/*
 * Set specified arguments into widget
 */

static Boolean
GaugeSetValues (Widget   old,
		Widget   request,
		Widget   new,
		ArgList  args,
		Cardinal *num_args)
{
	GaugeWidget oldgw = (GaugeWidget) old;
	GaugeWidget gw = (GaugeWidget) new;
	Boolean was_resized = False;

	if( gw->gauge.selected != None ) {
	  XtDisownSelection(new, gw->gauge.selected, CurrentTime) ;
	  gw->gauge.selected = None ;
	}

	/* Changes to v0,v1,labels, ntics, nlabels require resize & redraw. */
	/* Change to value requires redraw and possible resize if autoscale */

	was_resized =
	  gw->gauge.v0 != oldgw->gauge.v0  ||
	  gw->gauge.v1 != oldgw->gauge.v1  ||
	  gw->gauge.ntics != oldgw->gauge.ntics  ||
	  gw->gauge.nlabels != oldgw->gauge.nlabels  ||
	  gw->gauge.labels != oldgw->gauge.labels ;

	if( (gw->gauge.autoScaleUp && gw->gauge.value > gw->gauge.v1) ||
	    (gw->gauge.autoScaleDown && gw->gauge.value < gw->gauge.v1/3 ))
	{
	  AutoScale(gw) ;
	  was_resized = TRUE ;
	}

	if( was_resized ) {
	  if( gw->label.resize )
	    GaugeSize(gw, &gw->core.width, &gw->core.height, DEF_LEN) ;
	  else
	    GaugeResize(new) ;
	}

	if( gw->gauge.update != oldgw->gauge.update )
	  {
	    if( gw->gauge.update > 0 )
	      EnableUpdate(gw) ;
	    else
	      DisableUpdate(gw) ;
	  }

	if( gw->core.background_pixel != oldgw->core.background_pixel )
	{
	  XtReleaseGC(new, gw->gauge.inverse_GC) ;
	  gw->gauge.inverse_GC = Get_GC(gw, gw->core.background_pixel) ;
	}

	return was_resized || gw->gauge.value != oldgw->gauge.value  ||
	   XtIsSensitive(old) != XtIsSensitive(new);
}


static XtGeometryResult
GaugeQueryGeometry (Widget w,
		    XtWidgetGeometry *intended,
		    XtWidgetGeometry *preferred)
{
    register GaugeWidget gw = (GaugeWidget)w;

    if( intended->width == w->core.width  &&
	intended->height == w->core.height )
      return XtGeometryNo ;

    preferred->request_mode = CWWidth | CWHeight;
    GaugeSize(gw, &preferred->width, &preferred->height, DEF_LEN) ;

    if( (!(intended->request_mode & CWWidth) ||
	  intended->width >= preferred->width)  &&
	(!(intended->request_mode & CWHeight) ||
	  intended->height >= preferred->height) )
      return XtGeometryYes;
    else
      return XtGeometryAlmost;
}




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

static void
GaugeSelect (Widget   w,
	     XEvent   *event,
	     String   *params,
	     Cardinal *num_params)
{
	GaugeWidget	gw = (GaugeWidget)w ;
	Atom		seln = XA_PRIMARY ;

	if( gw->gauge.selected != None ) {
	  XtDisownSelection(w, gw->gauge.selected, CurrentTime) ;
	  gw->gauge.selected = None ;
	}

	if( *num_params > 0 ) {
	  seln = XInternAtom(XtDisplay(w), params[0], False) ;
	  printf("atom %s is %ld\n", params[0], seln) ;
	}

	if( ! XtOwnSelection(w, seln, event->xbutton.time, GaugeConvert,
			GaugeLoseSel, GaugeDoneSel) )
	{
	  /* in real code, this error message would be replaced by
	   * something more elegant, or at least deleted
	   */

	  fprintf(stderr, "Gauge failed to get selection, try again\n") ;
	}
	else
	{
	  gw->gauge.selected = TRUE ;
	  gw->gauge.selstr = (String)XtMalloc(4*sizeof(int)) ;
	  sprintf(gw->gauge.selstr, "%d", gw->gauge.value) ;
	  GaugeExpose(w,0,0) ;
	}
}


static	Boolean
GaugeConvert (Widget	w,
	      Atom	*selection,	/* usually XA_PRIMARY */
	      Atom	*target,	/* requested target */
	      Atom	*type,		/* returned type */
	      XtPointer *value,		/* returned value */
	      unsigned long	*length,	/* returned length */
	      int	*format)	/* returned format */
{
	GaugeWidget	gw = (GaugeWidget)w ;
	XSelectionRequestEvent *req ;

	printf( "requesting selection %s:%s\n",
	    XGetAtomName(XtDisplay(w),*selection),
	    XGetAtomName(XtDisplay(w),*target));

#ifdef HAVE_XMU
	if( *target == XA_TARGETS(XtDisplay(w)) )
	{
	  Atom *rval, *stdTargets ;
	  unsigned long stdLength ;

	  /* XmuConvertStandardSelection can handle this.  This function
	   * will return a list of standard targets.  We prepend TEXT,
	   * STRING and INTEGER to the list and return it.
	   */

	  req = XtGetSelectionRequest(w, *selection, NULL) ;
	  XmuConvertStandardSelection(w, req->time, selection, target,
	  	type, (XPointer*)&stdTargets, &stdLength, format) ;

	  *type = XA_ATOM ;		/* TODO: needed? */
	  *length = stdLength + 3 ;
	  rval = (Atom *) XtMalloc(sizeof(Atom)*(stdLength+3)) ;
	  *value = (XtPointer) rval ;
	  *rval++ = XA_INTEGER ;
	  *rval++ = XA_STRING ;
	  *rval++ = XA_TEXT(XtDisplay(w)) ;
	  memcpy((char *)rval, (char *)stdTargets, stdLength*sizeof(Atom)) ;
	  XtFree((char*) stdTargets) ;
	  *format = 8*sizeof(Atom) ;	/* TODO: needed? */
	  return True ;
	}

	else
#endif
	  if( *target == XA_INTEGER )
	{
	  *type = XA_INTEGER ;
	  *length = 1 ;
	  *value = (XtPointer) &gw->gauge.value ;
	  *format = 8*sizeof(int) ;
	  return True ;
	}

	else if( *target == XA_STRING
#ifdef HAVE_XMU
		 ||
		 *target == XA_TEXT(XtDisplay(w))
#endif
		 )
	{
	  *type = *target ;
	  *length = strlen(gw->gauge.selstr)*sizeof(char) ;
	  *value = (XtPointer) gw->gauge.selstr ;
	  *format = 8 ;
	  return True ;
	}

	else
	{
	  /* anything else, we just give it to XmuConvertStandardSelection() */
#ifdef HAVE_XMU
	  req = XtGetSelectionRequest(w, *selection, NULL) ;
	  if( XmuConvertStandardSelection(w, req->time, selection, target,
	  	type, (XPointer *) value, length, format) )
	    return True ;
	  else
#endif
	    {
	    printf(
		"Gauge: requestor is requesting unsupported selection %s:%s\n",
	    	XGetAtomName(XtDisplay(w),*selection),
		XGetAtomName(XtDisplay(w),*target));
	    return False ;
	  }
	}
}



static	void
GaugeLoseSel (Widget w,
	      Atom   *selection)	/* usually XA_PRIMARY */
{
	GaugeWidget	gw = (GaugeWidget)w ;
	Display *dpy = XtDisplay(w) ;
	Window	win = XtWindow(w) ;

	if( gw->gauge.selstr != NULL ) {
	  XtFree(gw->gauge.selstr) ;
	  gw->gauge.selstr = NULL ;
	}

	gw->gauge.selected = False ;
	XClearWindow(dpy,win) ;
	GaugeExpose(w,0,0) ;
}


static	void
GaugeDoneSel (Widget w,
	      Atom   *selection,	/* usually XA_PRIMARY */
	      Atom   *target)		/* requested target */
{
	/* selection done, anything to do? */
}


static void
GaugePaste (Widget   w,
	    XEvent   *event,
	    String   *params,
	    Cardinal *num_params)
{
	Atom		seln = XA_PRIMARY ;

	if( *num_params > 0 ) {
	  seln = XInternAtom(XtDisplay(w), params[0], False) ;
	  printf("atom %s is %ld\n", params[0], seln) ;
	}

	/* try for integer value first */
	XtGetSelectionValue(w, seln, XA_INTEGER,
		GaugeGetSelCB, (XtPointer)XA_INTEGER,
		event->xbutton.time) ;
}

static	void
GaugeGetSelCB (Widget    w,
	       XtPointer client,
	       Atom      *selection,
	       Atom      *type,
	       XtPointer value,
	       unsigned long    *length,
	       int       *format)
{
	Display	*dpy = XtDisplay(w) ;
	Atom	target = (Atom)client ;
	int	*iptr ;
	char	*cptr ;

	if( *type == XA_INTEGER ) {
	  iptr = (int *)value ;
	  XawGaugeSetValue(w, *iptr) ;
	}

	else if( *type == XA_STRING
#ifdef HAVE_XMU
		 ||
		 *type == XA_TEXT(dpy)
#endif
		 )
	  {
	  cptr = (char *)value ;
	  XawGaugeSetValue(w, atoi(cptr)) ;
	}

	/* failed, try string */
	else if( *type == None && target == XA_INTEGER )
	  XtGetSelectionValue(w, *selection, XA_STRING,
		GaugeGetSelCB, (XtPointer)XA_STRING,
		CurrentTime) ;
}



/****************************************************************
 *
 * Public Procedures
 *
 ****************************************************************/


	/* Change gauge value.  Only undraw or draw what needs to be
	 * changed.
	 */

void
XawGaugeSetValue (Widget   w,
		  Cardinal value)
{
	GaugeWidget gw = (GaugeWidget)w ;
	int	oldvalue ;
	GC	gc ;

	if( gw->gauge.selected != None ) {
	  XtDisownSelection(w, gw->gauge.selected, CurrentTime) ;
	  gw->gauge.selected = None ;
	}

	if( !XtIsRealized(w) ) {
	  gw->gauge.value = value ;
	  return ;
	}

	/* need to rescale? */
	if(( gw->gauge.autoScaleUp && (int) value > gw->gauge.v1) ||
	   (gw->gauge.autoScaleDown && (int) value < gw->gauge.v1/3 ))
	{
	  XtVaSetValues(w, XtNvalue, value, 0) ;
	  return ;
	}

	oldvalue = gw->gauge.value ;
	gw->gauge.value = value ;

	gc = XtIsSensitive(w) ? gw->label.normal_GC : gw->label.gray_GC ;
	GaugeMercury(XtDisplay(w), XtWindow(w), gc, gw, oldvalue,value) ;
}


Cardinal
XawGaugeGetValue (Widget w)
{
	GaugeWidget gw = (GaugeWidget)w ;
	return gw->gauge.value ;
}




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

	/* draw the mercury over a specific region */

static	void
GaugeMercury (Display     *dpy,
	      Window      win,
	      GC          gc,
	      GaugeWidget gw,
	      Cardinal    val0,
	      Cardinal    val1)
{
	int	v0 = gw->gauge.v0 ;
	int	v1 = gw->gauge.v1 ;
	int	vd = v1 - v0 ;
	Dimension len ;		/* length (width or height) of gauge */
	Position e0, e1 ;	/* gauge ends */
	Position p0, p1 ;	/* mercury ends */
	int	y ;		/* vertical (horizontal) position */
	Boolean	undraw = FALSE ;

	len = gw->gauge.orientation == XtorientHorizontal ?
	  gw->core.width : gw->core.height ;

	e0 = gw->gauge.margin0 ;		/* left (top) end */
	e1 = len - gw->gauge.margin1 -1 ;	/* right (bottom) end */

	if( vd <= 0 ) vd = 1 ;

	if( (int) val0 < v0 ) val0 = v0 ;
	else if( (int) val0 > v1 ) val0 = v1 ;
	if( (int) val1 < v0 ) val1 = v0 ;
	else if( (int) val1 > v1 ) val1 = v1 ;

	p0 = (val0-v0)*(e1-e0-1)/vd ;
	p1 = (val1-v0)*(e1-e0-1)/vd ;

	if( p1 == p0 )
	  return ;

	y = gw->gauge.gmargin ;

	if( p1 < p0 )
	{
	  Position tmp = p0 ;
	  p0 = p1 ;
	  p1 = tmp ;
	  gc = gw->label.normal_GC ;
	  XSetForeground(dpy,gc, gw->core.background_pixel) ;
	  undraw = TRUE ;
	}

	if( gw->gauge.orientation == XtorientHorizontal )
	  XFillRectangle(dpy,win,gc, e0+p0+1,y+1, p1-p0,GA_WID) ;
	else
	  XFillRectangle(dpy,win,gc, y+1,e1-p1, GA_WID,p1-p0) ;

	if( undraw )
	  XSetForeground(dpy,gc, gw->label.foreground) ;
}



/* Search the labels, find the largest one. */
/* TODO: handle vertical fonts? */

static void
MaxLabel (GaugeWidget	gw,
	  Dimension	*wid,	/* max label width */
	  Dimension	*hgt,	/* max label height */
	  Dimension	*w0,	/* width of first label */
	  Dimension	*w1)	/* width of last label */
{
	char	lstr[80], *lbl ;
	int	w ;
	XFontStruct *font = gw->label.font ;
	int	i ;
	int	lw = 0;
	int	v0 = gw->gauge.v0 ;
	int	dv = gw->gauge.v1 - v0 ;
	int	n = gw->gauge.nlabels ;

	if( n > 0 )
	{
	  if( --n <= 0 ) {n = 1 ; v0 += dv/2 ;}

	  /* loop through all labels, figure out how much room they
	   * need.
	   */
	  w = 0 ;
	  for(i=0; i<gw->gauge.nlabels; ++i)
	  {
	    if( gw->gauge.labels == NULL )	/* numeric labels */
	      sprintf(lbl = lstr,"%d", v0 + i*dv/n) ;
	    else
	      lbl = gw->gauge.labels[i] ;

	    if( lbl != NULL ) {
	      lw = XTextWidth(font, lbl, strlen(lbl)) ;
	      w = Max( w, lw ) ;
	    }
	    else
	      lw = 0 ;

	    if( i == 0 && w0 != NULL ) *w0 = lw ;
	  }
	  if( w1 != NULL ) *w1 = lw ;

	  *wid = w ;
	  *hgt = font->max_bounds.ascent + font->max_bounds.descent ;
	}
	else
	  *wid = *hgt = 0 ;
}


/* Determine the preferred size for this widget.  choose 100x100 for
 * debugging.
 */

static void
GaugeSize (GaugeWidget gw,
	   Dimension   *wid,
	   Dimension   *hgt,
	   Dimension   min_len)
{
	int	w,h ;		/* width, height of gauge */
	int	vmargin ;	/* vertical margin */
	int	hmargin ;	/* horizontal margin */

	hmargin = gw->label.internal_width ;
	vmargin = gw->label.internal_height ;

	/* find total height (width) of contents */


	/* find minimum size for undecorated gauge */

	if( gw->gauge.orientation == XtorientHorizontal )
	{
	  w = min_len ;
	  h = GA_WID+2 ;			/* gauge itself + edges */
	}
	else
	{
	  w = GA_WID+2 ;
	  h = min_len ;
	}

	if( gw->gauge.ntics > 0 )
	{
	  if( gw->gauge.orientation == XtorientHorizontal )
	  {
	    w = Max(w, gw->gauge.ntics*3) ;
	    h += vmargin + TIC_LEN ;
	  }
	  else
	  {
	    w += hmargin + TIC_LEN ;
	    h = Max(h, gw->gauge.ntics*3) ;
	  }
	}


	/* If labels are requested, this gets a little interesting.
	 * We want the end labels centered on the ends of the gauge and
	 * the centers of the labels evenly spaced.  The labels at the ends
	 * will not be the same width, meaning that the gauge itself need
	 * not be centered in the widget.
	 *
	 * First, determine the spacing.  This is the width of the widest
	 * label, plus the internal margin.  Total length of the gauge is
	 * spacing * (nlabels-1).  To this, we add half the width of the
	 * left-most label and half the width of the right-most label
	 * to get the entire desired width of the widget.
	 */
	if( gw->gauge.nlabels > 0 )
	{
	  Dimension	lwm, lw0, lw1 ;	/* width of max, left, right labels */
	  Dimension	lh ;

	  MaxLabel(gw,&lwm,&lh, &lw0,&lw1) ;

	  if( gw->gauge.orientation == XtorientHorizontal )
	  {
	    lwm = (lwm+hmargin) * (gw->gauge.nlabels-1) + (lw0+lw1)/2 ;
	    w = Max(w, lwm) ;
	    h += lh + vmargin ;
	  }
	  else
	  {
	    lh = lh*gw->gauge.nlabels + (gw->gauge.nlabels - 1)*vmargin ;
	    h = Max(h, lh) ;
	    w += lwm + hmargin ;
	  }
	}

	w += hmargin*2 ;
	h += vmargin*2 ;

	*wid = w ;
	*hgt = h ;
}



static void
AutoScale (GaugeWidget gw)
{
	static int scales[3] = {1,2,5} ;
	int sptr = 0, smult=1 ;

	if( gw->gauge.autoScaleDown )
	  gw->gauge.v1 = 0 ;
	while( gw->gauge.value > gw->gauge.v1 )
	{
	  if( ++sptr > 2 ) {
	    sptr = 0 ;
	    smult *= 10 ;
	  }
	  gw->gauge.v1 = scales[sptr] * smult ;
	}
}

static	void
EnableUpdate (GaugeWidget gw)
{
	gw->gauge.intervalId =
	  XtAppAddTimeOut(XtWidgetToApplicationContext((Widget)gw),
	  	gw->gauge.update * MS_PER_SEC, GaugeGetValue,
		(XtPointer)gw) ;
}

static	void
DisableUpdate (GaugeWidget gw)
{
	XtRemoveTimeOut(gw->gauge.intervalId) ;
}

static	void
GaugeGetValue (XtPointer    clientData,
	       XtIntervalId *intervalId)
{
	GaugeWidget	gw = (GaugeWidget)clientData ;
	Cardinal	value ;

	if( gw->gauge.update > 0 )
	  EnableUpdate(gw) ;

	if( gw->gauge.getValue != NULL )
	{
	  XtCallCallbackList((Widget)gw, gw->gauge.getValue, (XtPointer)&value);
	  XawGaugeSetValue((Widget)gw, value) ;
	}
}


static	GC
Get_GC (GaugeWidget gw,
	Pixel       fg)
{
	XGCValues	values ;
#define	vmask	GCForeground
#define	umask	(GCBackground|GCSubwindowMode|GCGraphicsExposures|GCDashOffset\
		|GCFont|GCDashList|GCArcMode)

	values.foreground = fg ;

	return XtAllocateGC((Widget)gw, 0, vmask, &values, 0L, umask) ;
}