/*
 * $XConsortium: Panner.c,v 1.45 92/03/03 13:52:26 converse Exp $
 *
 * Copyright 1989 Massachusetts Institute of Technology
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, 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 name of M.I.T. not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  M.I.T. makes no representations about the
 * suitability of this software for any purpose.  It is provided "as is"
 * without express or implied warranty.
 *
 * M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL M.I.T.
 * 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.
 *
 * Author:  Jim Fulton, MIT X Consortium
 */


#ifdef VMS
#   include <X11_DIRECTORY/IntrinsicP.h>	/* for toolkit routines */
#   include <X11_DIRECTORY/StringDefs.h>	/* for XtN and XtC defines */
#   if (XlibSpecificationRelease<5) /*###jp### inserted 22.10.94*/
#      define _XtStringDefs_h_
#   endif
#   include <XMU_DIRECTORY/CharSet.h>		/* for XmuCompareISOLatin1() */
#   include <XAW_DIRECTORY/XawInit.h>		/* for XawInitializeWidgetSet */
#   include <XAW_DIRECTORY/PannerP.h>		/* us */
#   include <XMU_DIRECTORY/Misc.h>		/* for Min */
#   include <XMU_DIRECTORY/Drawing.h>
#   include <stdlib.h> /*###jp### inserted 21.10.94 */
#else
#   include <X11/IntrinsicP.h>		/* for toolkit routines */
#   include <X11/StringDefs.h>		/* for XtN and XtC defines */
#   include <X11/Xmu/CharSet.h>		/* for XmuCompareISOLatin1() */
#   include <X11/Xaw3d/XawInit.h>		/* for XawInitializeWidgetSet */
#   include <X11/Xaw3d/PannerP.h>		/* us */
#   include <X11/Xmu/Misc.h>		/* for Min */
#   include <X11/Xmu/Drawing.h>
#endif

/*
#define MESSAGES
*/
#include "message.h"
#include <ctype.h>			/* for isascii() etc. */
#include <math.h>			/* for atof() */

extern Bool XmuDistinguishablePixels(); /* not defined in any Xmu headers */

#if defined(ISC) && defined(SYSV) && defined(SYSV386) && __STDC__
extern double atof(char *);
#endif

static char defaultTranslations[] = 
  "<Btn1Down>:    start() \n\
   <Btn1Motion>:  move() \n\
   <Btn1Up>:      notify() stop() \n\
   <Btn2Down>:    abort() \n\
   <Key>KP_Enter: set(rubberband,toggle) \n\
   <Key>space:    page(+1p,+1p) \n\
   <Key>Delete:   page(-1p,-1p) \n\
   <Key>BackSpace:  page(-1p,-1p) \n\
   <Key>Left:     page(-.5p,+0) \n\
   <Key>Right:    page(+.5p,+0) \n\
   <Key>Up:       page(+0,-.5p) \n\
   <Key>Down:     page(+0,+.5p) \n\
   <Key>Home:     page(0,0) ";


static void ActionStart(), ActionStop(), ActionAbort(), ActionMove();
static void ActionPage(), ActionNotify(), ActionSet();

static XtActionsRec actions[] = {
    { "start", ActionStart },		/* start tmp graphics */
    { "stop", ActionStop },		/* stop tmp graphics */
    { "abort", ActionAbort },		/* punt */
    { "move", ActionMove },		/* move tmp graphics on Motion event */
    { "page", ActionPage },		/* page around usually from keyboard */
    { "notify", ActionNotify },		/* callback new position */
    { "set", ActionSet },		/* set various parameters */
};


/*
 * resources for the panner
 */
static XtResource resources[] = {
#define poff(field) XtOffsetOf(PannerRec, panner.field)
    { XtNallowOff, XtCAllowOff, XtRBoolean, sizeof(Boolean),
	poff(allow_off), XtRImmediate, (XtPointer) FALSE },
    { XtNresize, XtCResize, XtRBoolean, sizeof(Boolean),
	poff(resize_to_pref), XtRImmediate, (XtPointer) TRUE },
    { XtNreportCallback, XtCReportCallback, XtRCallback, sizeof(XtPointer),
	poff(report_callbacks), XtRCallback, (XtPointer) NULL },
    { XtNdefaultScale, XtCDefaultScale, XtRDimension, sizeof(Dimension),
	poff(default_scale), XtRImmediate, (XtPointer) PANNER_DEFAULT_SCALE },
    { XtNrubberBand, XtCRubberBand, XtRBoolean, sizeof(Boolean),
	poff(rubber_band), XtRImmediate, (XtPointer) FALSE },
    { XtNforeground, XtCForeground, XtRPixel, sizeof(Pixel), 
	poff(foreground), XtRString, (XtPointer) XtDefaultBackground },
    { XtNinternalSpace, XtCInternalSpace, XtRDimension, sizeof(Dimension),
	poff(internal_border), XtRImmediate, (XtPointer) 4 },
    { XtNlineWidth, XtCLineWidth, XtRDimension, sizeof(Dimension),
	poff(line_width), XtRImmediate, (XtPointer) 0 },
    { XtNcanvasWidth, XtCCanvasWidth, XtRDimension, sizeof(Dimension),
	poff(canvas_width), XtRImmediate, (XtPointer) 0 },
    { XtNcanvasHeight, XtCCanvasHeight, XtRDimension, sizeof(Dimension),
	poff(canvas_height), XtRImmediate, (XtPointer) 0 },
    { XtNsliderX, XtCSliderX, XtRPosition, sizeof(Position),
	poff(slider_x), XtRImmediate, (XtPointer) 0 },
    { XtNsliderY, XtCSliderY, XtRPosition, sizeof(Position),
	poff(slider_y), XtRImmediate, (XtPointer) 0 },
    { XtNsliderWidth, XtCSliderWidth, XtRDimension, sizeof(Dimension),
	poff(slider_width), XtRImmediate, (XtPointer) 0 },
    { XtNsliderHeight, XtCSliderHeight, XtRDimension, sizeof(Dimension),
	poff(slider_height), XtRImmediate, (XtPointer) 0 },
    { XtNshadowColor, XtCShadowColor, XtRPixel, sizeof(Pixel),
	poff(shadow_color), XtRString, (XtPointer) XtDefaultForeground },
    { XtNshadowThickness, XtCShadowThickness, XtRDimension, sizeof(Dimension),
	poff(shadow_thickness), XtRImmediate, (XtPointer) 2 },
    { XtNbackgroundStipple, XtCBackgroundStipple, XtRString, sizeof(String),
	poff(stipple_name), XtRImmediate, (XtPointer) NULL },
#undef poff
};


/*
 * widget class methods used below
 */
static void Initialize();		/* create gc's */
static void Realize();			/* create window */
static void Destroy();			/* clean up widget */
static void Resize();			/* need to rescale ourselves */
static void Redisplay();		/* draw ourselves */
static Boolean SetValues();		/* set all of the resources */
static void SetValuesAlmost();		/* deal with failed setval geom req */
static XtGeometryResult QueryGeometry();  /* say how big we would like to be */

PannerClassRec pannerClassRec = {
  { /* core fields */
    /* superclass		*/	(WidgetClass) &simpleClassRec,
    /* class_name		*/	"Panner",
    /* widget_size		*/	sizeof(PannerRec),
    /* class_initialize		*/	XawInitializeWidgetSet,
    /* class_part_initialize	*/	NULL,
    /* class_inited		*/	FALSE,
    /* initialize		*/	Initialize,
    /* initialize_hook		*/	NULL,
    /* realize			*/	Realize,
    /* 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			*/	Destroy,
    /* resize			*/	Resize,
    /* expose			*/	Redisplay,
    /* set_values		*/	SetValues,
    /* set_values_hook		*/	NULL,
    /* set_values_almost	*/	SetValuesAlmost,
    /* get_values_hook		*/	NULL,
    /* accept_focus		*/	NULL,
    /* version			*/	XtVersion,
    /* callback_private		*/	NULL,
    /* tm_table			*/	defaultTranslations,
    /* query_geometry		*/	QueryGeometry,
    /* display_accelerator	*/	XtInheritDisplayAccelerator,
    /* extension		*/	NULL
  },
  { /* simple fields */
    /* change_sensitive		*/	XtInheritChangeSensitive
  },
  { /* panner fields */
    /* ignore                   */	0
  }
};

WidgetClass pannerWidgetClass = (WidgetClass) &pannerClassRec;


/*****************************************************************************
 *                                                                           *
 *			    panner utility routines                          *
 *                                                                           *
 *****************************************************************************/

static void reset_shadow_gc (pw)	/* used when resources change */
    PannerWidget pw;
{
    XtGCMask valuemask = GCForeground;
    XGCValues values;
    unsigned long   pixels[3];

    if (pw->panner.shadow_gc) XtReleaseGC ((Widget) pw, pw->panner.shadow_gc);

    pixels[0] = pw->panner.foreground;
    pixels[1] = pw->core.background_pixel;
    pixels[2] = pw->panner.shadow_color;
    if (!pw->panner.stipple_name &&
	!XmuDistinguishablePixels (XtDisplay (pw), pw->core.colormap,
				    pixels, 3) &&
	XmuDistinguishablePixels (XtDisplay (pw), pw->core.colormap,
				    pixels, 2))
    {
	valuemask = GCTile | GCFillStyle;
	values.fill_style = FillTiled;
	values.tile = XmuCreateStippledPixmap(XtScreen((Widget)pw),
					      pw->panner.foreground,
					      pw->core.background_pixel,
					      pw->core.depth);
    }
    else
    {
	if (!pw->panner.line_width &&
	    !XmuDistinguishablePixels (XtDisplay (pw), pw->core.colormap,
				       pixels, 2))
	    pw->panner.line_width = 1;
	valuemask = GCForeground;
	values.foreground = pw->panner.shadow_color;
    }
    if (pw->panner.line_width > 0) {
	values.line_width = pw->panner.line_width;
	valuemask |= GCLineWidth;
    }

    pw->panner.shadow_gc = XtGetGC ((Widget) pw, valuemask, &values);
}

static void reset_slider_gc (pw)	/* used when resources change */
    PannerWidget pw;
{
    XtGCMask valuemask = GCForeground;
    XGCValues values;

    if (pw->panner.slider_gc) XtReleaseGC ((Widget) pw, pw->panner.slider_gc);

    values.foreground = pw->panner.foreground;

    pw->panner.slider_gc = XtGetGC ((Widget) pw, valuemask, &values);
}

static void reset_xor_gc (pw)		/* used when resources change */
    PannerWidget pw;
{
    if (pw->panner.xor_gc) XtReleaseGC ((Widget) pw, pw->panner.xor_gc);

    if (pw->panner.rubber_band) {
	XtGCMask valuemask = (GCForeground | GCFunction);
	XGCValues values;
	Pixel tmp;

	tmp = ((pw->panner.foreground == pw->core.background_pixel) ?
	       pw->panner.shadow_color : pw->panner.foreground);
	values.foreground = tmp ^ pw->core.background_pixel;
	values.function = GXxor;
	if (pw->panner.line_width > 0) {
	    valuemask |= GCLineWidth;
	    values.line_width = pw->panner.line_width;
	}
	pw->panner.xor_gc = XtGetGC ((Widget) pw, valuemask, &values);
    } else {
	pw->panner.xor_gc = NULL;
    }
}


static void check_knob (pw, knob)
    register PannerWidget pw;
    Boolean knob;
{
    Position pad = pw->panner.internal_border * 2;
    Position maxx = (((Position) pw->core.width) - pad -
		     ((Position) pw->panner.knob_width));
    Position maxy = (((Position) pw->core.height) - pad -
		     ((Position) pw->panner.knob_height));
    Position *x = (knob ? &pw->panner.knob_x : &pw->panner.tmp.x);
    Position *y = (knob ? &pw->panner.knob_y : &pw->panner.tmp.y);

    /*
     * note that positions are already normalized (i.e. internal_border
     * has been subtracted out)
     */
    if (*x < 0) *x = 0;
    if (*x > maxx) *x = maxx;

    if (*y < 0) *y = 0;
    if (*y > maxy) *y = maxy;

    if (knob) {
	pw->panner.slider_x = (Position) (((double) pw->panner.knob_x) /
					  pw->panner.haspect + 0.5);
	pw->panner.slider_y = (Position) (((double) pw->panner.knob_y) /
					  pw->panner.vaspect + 0.5);
	pw->panner.last_x = pw->panner.last_y = PANNER_OUTOFRANGE;
    }
}


static void move_shadow (pw)
    register PannerWidget pw;
{
    if (pw->panner.shadow_thickness > 0) {
	int lw = pw->panner.shadow_thickness + pw->panner.line_width * 2;
	int pad = pw->panner.internal_border;

	if ((int)pw->panner.knob_height > lw && (int)pw->panner.knob_width > lw) {
	    register XRectangle *r = pw->panner.shadow_rects;
	    r->x = (short) (pw->panner.knob_x + pad + pw->panner.knob_width);
	    r->y = (short) (pw->panner.knob_y + pad + lw);
	    r->width = pw->panner.shadow_thickness;
	    r->height = (unsigned short) (pw->panner.knob_height - lw);
	    r++;
	    r->x = (short) (pw->panner.knob_x + pad + lw);
	    r->y = (short) (pw->panner.knob_y + pad + pw->panner.knob_height);
	    r->width = (unsigned short) (pw->panner.knob_width - lw +
					 pw->panner.shadow_thickness);
	    r->height = pw->panner.shadow_thickness;
	    pw->panner.shadow_valid = TRUE;
	    return;
	}
    }
    pw->panner.shadow_valid = FALSE;
}

static void scale_knob (pw, location, size)  /* set knob size and/or loc */
    PannerWidget pw;
    Boolean location, size;
{
    if (location) {
	pw->panner.knob_x = (Position) PANNER_HSCALE (pw, pw->panner.slider_x);
	pw->panner.knob_y = (Position) PANNER_VSCALE (pw, pw->panner.slider_y);
    }
    if (size) {
	Dimension width, height;

	if (pw->panner.slider_width < 1) {
	    pw->panner.slider_width = pw->panner.canvas_width;
	}
	if (pw->panner.slider_height < 1) {
	    pw->panner.slider_height = pw->panner.canvas_height;
	}
	width = Min (pw->panner.slider_width, pw->panner.canvas_width);
	height = Min (pw->panner.slider_height, pw->panner.canvas_height);

	pw->panner.knob_width = (Dimension) PANNER_HSCALE (pw, width);
	pw->panner.knob_height = (Dimension) PANNER_VSCALE (pw, height);
    }
    if (!pw->panner.allow_off) check_knob (pw, TRUE);
    move_shadow (pw);
}

static void rescale (pw)
    PannerWidget pw;
{
    int hpad = pw->panner.internal_border * 2;
    int vpad = hpad;

    if (pw->panner.canvas_width < 1)
      pw->panner.canvas_width = pw->core.width;
    if (pw->panner.canvas_height < 1)
      pw->panner.canvas_height = pw->core.height;

    if ((int)pw->core.width <= hpad) hpad = 0;
    if ((int)pw->core.height <= vpad) vpad = 0;

    pw->panner.haspect = ((double) pw->core.width - hpad) /
			  (double) pw->panner.canvas_width;
    pw->panner.vaspect = ((double) pw->core.height - vpad) /
			  (double) pw->panner.canvas_height;
    scale_knob (pw, TRUE, TRUE);
}


static void get_default_size (pw, wp, hp)
    PannerWidget pw;
    Dimension *wp, *hp;
{
    Dimension pad = pw->panner.internal_border * 2;
    BEGINMESSAGE(get_default_size)
    IIMESSAGE(pw->panner.canvas_width,pw->panner.canvas_height)
    *wp = PANNER_DSCALE (pw, pw->panner.canvas_width) + pad;
    *hp = PANNER_DSCALE (pw, pw->panner.canvas_height) + pad;
    IIMESSAGE(*wp,*hp)
    ENDMESSAGE(get_default_size)
}

static Boolean get_event_xy (pw, event, x, y)
    PannerWidget pw;
    XEvent *event;
    int *x, *y;
{
    int pad = pw->panner.internal_border;

    switch (event->type) {
      case ButtonPress:
      case ButtonRelease:
	*x = event->xbutton.x - pad;
	*y = event->xbutton.y - pad;
	return TRUE;

      case KeyPress:
      case KeyRelease:
	*x = event->xkey.x - pad;
	*y = event->xkey.y - pad;
	return TRUE;

      case EnterNotify:
      case LeaveNotify:
	*x = event->xcrossing.x - pad;
	*y = event->xcrossing.y - pad;
	return TRUE;

      case MotionNotify:
	*x = event->xmotion.x - pad;
	*y = event->xmotion.y - pad;
	return TRUE;
    }

    return FALSE;
}

static int parse_page_string (s, pagesize, canvassize, relative)
    register char *s;
    int pagesize, canvassize;
    Boolean *relative;
{
    char *cp;
    double val = 1.0;
    Boolean rel = FALSE;

    /*
     * syntax:    spaces [+-] number spaces [pc\0] spaces
     */

    for (; isascii(*s) && isspace(*s); s++) ;	/* skip white space */

    if (*s == '+' || *s == '-') {	/* deal with signs */
	rel = TRUE;
	if (*s == '-') val = -1.0;
	s++;
    }
    if (!*s) {				/* if null then return nothing */
	*relative = TRUE;
	return 0;
    }

					/* skip over numbers */
    for (cp = s; isascii(*s) && (isdigit(*s) || *s == '.'); s++) ;
    val *= atof (cp);

					/* skip blanks */
    for (; isascii(*s) && isspace(*s); s++) ;

    if (*s) {				/* if units */
	switch (s[0]) {
	  case 'p': case 'P':
	    val *= (double) pagesize;
	    break;

	  case 'c': case 'C':
	    val *= (double) canvassize;
	    break;
	}
    }
    *relative = rel;
    return ((int) val);
}


#define DRAW_TMP(pw) \
{ \
    XDrawRectangle (XtDisplay(pw), XtWindow(pw), \
		    pw->panner.xor_gc, \
		    (int) (pw->panner.tmp.x + pw->panner.internal_border), \
		    (int) (pw->panner.tmp.y + pw->panner.internal_border), \
		    (unsigned int) (pw->panner.knob_width - 1), \
		    (unsigned int) (pw->panner.knob_height - 1)); \
    pw->panner.tmp.showing = !pw->panner.tmp.showing; \
}

#define UNDRAW_TMP(pw) \
{ \
    if (pw->panner.tmp.showing) DRAW_TMP(pw); \
}

#define BACKGROUND_STIPPLE(pw) \
  XmuLocatePixmapFile (pw->core.screen, pw->panner.stipple_name, \
		       pw->panner.shadow_color, pw->core.background_pixel, \
		       pw->core.depth, NULL, 0, NULL, NULL, NULL, NULL)
    
#define PIXMAP_OKAY(pm) ((pm) != None && (pm) != XtUnspecifiedPixmap)


/*****************************************************************************
 *                                                                           *
 * 			     panner class methods                            *
 *                                                                           *
 *****************************************************************************/


static void Initialize (greq, gnew, args, num_args)
    Widget greq, gnew;
    ArgList args;
    Cardinal *num_args;
{
    PannerWidget req = (PannerWidget) greq, new = (PannerWidget) gnew;
    Dimension defwidth, defheight;

    if (req->panner.canvas_width < 1) new->panner.canvas_width = 1;
    if (req->panner.canvas_height < 1) new->panner.canvas_height = 1;
    if (req->panner.default_scale < 1)
      new->panner.default_scale = PANNER_DEFAULT_SCALE;

    get_default_size (req, &defwidth, &defheight);
    if (req->core.width < 1) new->core.width = defwidth;
    if (req->core.height < 1) new->core.height = defheight;

    new->panner.shadow_gc = NULL;
    reset_shadow_gc (new);		/* shadowColor */
    new->panner.slider_gc = NULL;
    reset_slider_gc (new);		/* foreground */
    new->panner.xor_gc = NULL;
    reset_xor_gc (new);			/* foreground ^ background */

    rescale (new);			/* does a position check */
    new->panner.shadow_valid = FALSE;
    new->panner.tmp.doing = FALSE;
    new->panner.tmp.showing = FALSE;
}


static void Realize (gw, valuemaskp, attr)
    Widget gw;
    XtValueMask *valuemaskp;
    XSetWindowAttributes *attr;
{
    PannerWidget pw = (PannerWidget) gw;
    Pixmap pm = XtUnspecifiedPixmap;
    Boolean gotpm = FALSE;

    if (pw->core.background_pixmap == XtUnspecifiedPixmap) {
	if (pw->panner.stipple_name) pm = BACKGROUND_STIPPLE (pw);

	if (PIXMAP_OKAY(pm)) {
	    attr->background_pixmap = pm;
	    *valuemaskp |= CWBackPixmap;
	    *valuemaskp &= ~CWBackPixel;
	    gotpm = TRUE;
	}
    }
    (*pannerWidgetClass->core_class.superclass->core_class.realize)
      (gw, valuemaskp, attr);

    if (gotpm) XFreePixmap (XtDisplay(gw), pm);
}


static void Destroy (gw)
    Widget gw;
{
    PannerWidget pw = (PannerWidget) gw;

    XtReleaseGC (gw, pw->panner.shadow_gc);
    XtReleaseGC (gw, pw->panner.slider_gc);
    XtReleaseGC (gw, pw->panner.xor_gc);
}


static void Resize (gw)
    Widget gw;
{
    rescale ((PannerWidget) gw);
}


/* ARGSUSED */
static void Redisplay (gw, event, region)
    Widget gw;
    XEvent *event;
    Region region;
{
    PannerWidget pw = (PannerWidget) gw;
    Display *dpy = XtDisplay(gw);
    Window w = XtWindow(gw);
    int pad = pw->panner.internal_border;
    Dimension lw = pw->panner.line_width;
    Dimension extra = pw->panner.shadow_thickness + lw * 2;
    int kx = pw->panner.knob_x + pad, ky = pw->panner.knob_y + pad;

    BEGINMESSAGE(Redisplay)
    pw->panner.tmp.showing = FALSE;
    XClearArea (XtDisplay(pw), XtWindow(pw), 
		(int) pw->panner.last_x - ((int) lw) + pad, 
		(int) pw->panner.last_y - ((int) lw) + pad, 
		(unsigned int) (pw->panner.knob_width + extra),
		(unsigned int) (pw->panner.knob_height + extra),
		False);
    pw->panner.last_x = pw->panner.knob_x;
    pw->panner.last_y = pw->panner.knob_y;

    XFillRectangle (dpy, w, pw->panner.slider_gc, kx, ky,
		    pw->panner.knob_width - 1, pw->panner.knob_height - 1);

    if (lw)
    {
    	XDrawRectangle (dpy, w, pw->panner.shadow_gc, kx, ky,
		    	(unsigned int) (pw->panner.knob_width - 1), 
		    	(unsigned int) (pw->panner.knob_height - 1));
    }

    if (pw->panner.shadow_valid) {
	XFillRectangles (dpy, w, pw->panner.shadow_gc,
			 pw->panner.shadow_rects, 2);
    }
    if (pw->panner.tmp.doing && pw->panner.rubber_band) DRAW_TMP (pw);
    ENDMESSAGE(Redisplay)
}


/* ARGSUSED */
static Boolean SetValues (gcur, greq, gnew, args, num_args)
    Widget gcur, greq, gnew;
    ArgList args;
    Cardinal *num_args;
{
    PannerWidget cur = (PannerWidget) gcur;
    PannerWidget new = (PannerWidget) gnew;
    Boolean redisplay = FALSE;

    if (cur->panner.foreground != new->panner.foreground) {
	reset_slider_gc (new);
	if (cur->panner.foreground != cur->core.background_pixel)
	  reset_xor_gc (new);
	redisplay = TRUE;
    } else if (cur->panner.line_width != new->panner.line_width ||
	       cur->core.background_pixel != new->core.background_pixel) {
	reset_xor_gc (new);
	redisplay = TRUE;
    }
    if (cur->panner.shadow_color != new->panner.shadow_color) {
	reset_shadow_gc (new);
	if (cur->panner.foreground == cur->core.background_pixel)
	  reset_xor_gc (new);
	redisplay = TRUE;
    }
    if (cur->panner.shadow_thickness != new->panner.shadow_thickness) {
	move_shadow (new);
	redisplay = TRUE;
    }
    if (cur->panner.rubber_band != new->panner.rubber_band) {
	reset_xor_gc (new);
	if (new->panner.tmp.doing) redisplay = TRUE;
    }

    if ((cur->panner.stipple_name != new->panner.stipple_name ||
	 cur->panner.shadow_color != new->panner.shadow_color ||
	 cur->core.background_pixel != new->core.background_pixel) &&
	XtIsRealized(gnew)) {
	Pixmap pm = (new->panner.stipple_name ? BACKGROUND_STIPPLE (new)
		     : XtUnspecifiedPixmap);

	if (PIXMAP_OKAY(pm)) {
	    XSetWindowBackgroundPixmap (XtDisplay (new), XtWindow(new), pm);
	    XFreePixmap (XtDisplay (new), pm);
	} else {
	    XSetWindowBackground (XtDisplay (new), XtWindow(new),
				  new->core.background_pixel);
	}
	redisplay = TRUE;
    }

    if (new->panner.resize_to_pref &&
	(cur->panner.canvas_width != new->panner.canvas_width ||
	 cur->panner.canvas_height != new->panner.canvas_height ||
	 cur->panner.resize_to_pref != new->panner.resize_to_pref)) {
	get_default_size (new, &new->core.width, &new->core.height);
	redisplay = TRUE;
    } else if (cur->panner.canvas_width != new->panner.canvas_width ||
	cur->panner.canvas_height != new->panner.canvas_height ||
	cur->panner.internal_border != new->panner.internal_border) {
	rescale (new);			/* does a scale_knob as well */
	redisplay = TRUE;
    } else {
	Boolean loc = (cur->panner.slider_x != new->panner.slider_x ||
		       cur->panner.slider_y != new->panner.slider_y);
	Boolean siz = (cur->panner.slider_width != new->panner.slider_width ||
		       cur->panner.slider_height != new->panner.slider_height);
	if (loc || siz ||
	    (cur->panner.allow_off != new->panner.allow_off &&
	     new->panner.allow_off)) {
	    scale_knob (new, loc, siz);
	    redisplay = TRUE;
	}
    }

    return redisplay;
}

static void SetValuesAlmost (gold, gnew, req, reply)
    Widget gold, gnew;
    XtWidgetGeometry *req, *reply;
{
    if (reply->request_mode == 0) {	/* got turned down, so cope */
	Resize (gnew);
    }
    (*pannerWidgetClass->core_class.superclass->core_class.set_values_almost)
	(gold, gnew, req, reply);
}

static XtGeometryResult QueryGeometry (gw, intended, pref)
    Widget gw;
    XtWidgetGeometry *intended, *pref;
{
    XtGeometryResult res;
    PannerWidget pw = (PannerWidget) gw;

    BEGINMESSAGE(QueryGeometry) 
    pref->request_mode = (CWWidth | CWHeight);
    get_default_size (pw, &pref->width, &pref->height);
    if (((intended->request_mode & (CWWidth | CWHeight)) ==
	 (CWWidth | CWHeight)) &&
	intended->width == pref->width &&
	intended->height == pref->height)
      res = XtGeometryYes;
    else if (pref->width == pw->core.width && pref->height == pw->core.height)
      res = XtGeometryNo;
    else
      res = XtGeometryAlmost;
    ENDMESSAGE(QueryGeometry)
    return res;
}


/*****************************************************************************
 *                                                                           *
 * 			      panner action procs                            *
 *                                                                           *
 *****************************************************************************/

/* ARGSUSED */
static void ActionStart (gw, event, params, num_params)
    Widget gw;
    XEvent *event;
    String *params;			/* unused */
    Cardinal *num_params;		/* unused */
{
    PannerWidget pw = (PannerWidget) gw;
    int x, y;

    if (!get_event_xy (pw, event, &x, &y)) {
	XBell (XtDisplay(gw), 0);	/* should do error message */
	return;
    }

    pw->panner.tmp.doing = TRUE;
    pw->panner.tmp.startx = pw->panner.knob_x;
    pw->panner.tmp.starty = pw->panner.knob_y;
    pw->panner.tmp.dx = (((Position) x) - pw->panner.knob_x);
    pw->panner.tmp.dy = (((Position) y) - pw->panner.knob_y);
    pw->panner.tmp.x = pw->panner.knob_x;
    pw->panner.tmp.y = pw->panner.knob_y;
    if (pw->panner.rubber_band) DRAW_TMP (pw);
}

/* ARGSUSED */
static void ActionStop (gw, event, params, num_params)
    Widget gw;
    XEvent *event;
    String *params;			/* unused */
    Cardinal *num_params;		/* unused */
{
    PannerWidget pw = (PannerWidget) gw;
    int x, y;

    if (get_event_xy (pw, event, &x, &y)) {
	pw->panner.tmp.x = ((Position) x) - pw->panner.tmp.dx;
	pw->panner.tmp.y = ((Position) y) - pw->panner.tmp.dy;
	if (!pw->panner.allow_off) check_knob (pw, FALSE);
    }
    if (pw->panner.rubber_band) UNDRAW_TMP (pw);
    pw->panner.tmp.doing = FALSE;
}

/* ARGSUSED */
static void ActionAbort (gw, event, params, num_params)
    Widget gw;
    XEvent *event;
    String *params;			/* unused */
    Cardinal *num_params;		/* unused */
{
    PannerWidget pw = (PannerWidget) gw;

    if (!pw->panner.tmp.doing) return;

    if (pw->panner.rubber_band) UNDRAW_TMP (pw);

    if (!pw->panner.rubber_band) {		/* restore old position */
	pw->panner.tmp.x = pw->panner.tmp.startx;
	pw->panner.tmp.y = pw->panner.tmp.starty;
	ActionNotify (gw, event, params, num_params);
    }
    pw->panner.tmp.doing = FALSE;
}


/* ARGSUSED */
static void ActionMove (gw, event, params, num_params)
    Widget gw;
    XEvent *event;			/* must be a motion event */
    String *params;			/* unused */
    Cardinal *num_params;		/* unused */
{
    PannerWidget pw = (PannerWidget) gw;
    int x, y;

    if (!pw->panner.tmp.doing) return;

    if (!get_event_xy (pw, event, &x, &y)) {
	XBell (XtDisplay(gw), 0);	/* should do error message */
	return;
    }

    if (pw->panner.rubber_band) UNDRAW_TMP (pw);
    pw->panner.tmp.x = ((Position) x) - pw->panner.tmp.dx;
    pw->panner.tmp.y = ((Position) y) - pw->panner.tmp.dy;

    if (!pw->panner.rubber_band) {
	ActionNotify (gw, event, params, num_params);  /* does a check */
    } else {
	if (!pw->panner.allow_off) check_knob (pw, FALSE);
	DRAW_TMP (pw);
    }
}


/* ARGSUSED */
static void ActionPage (gw, event, params, num_params)
    Widget gw;
    XEvent *event;			/* unused */
    String *params;
    Cardinal *num_params;		/* unused */
{
    PannerWidget pw = (PannerWidget) gw;
    Cardinal zero = 0;
    Boolean isin = pw->panner.tmp.doing;
    int x, y;
    Boolean relx, rely;
    int pad = pw->panner.internal_border * 2;

    if (*num_params != 2) {
	XBell (XtDisplay(gw), 0);
	return;
    }

    x = parse_page_string (params[0], (int) pw->panner.knob_width,
			   ((int) pw->core.width) - pad, &relx);
    y = parse_page_string (params[1], (int) pw->panner.knob_height,
			   ((int) pw->core.height) - pad, &rely);

    if (relx) x += pw->panner.knob_x;
    if (rely) y += pw->panner.knob_y;

    if (isin) {				/* if in, then use move */
	XEvent ev;
	ev.xbutton.type = ButtonPress;
	ev.xbutton.x = x;
	ev.xbutton.y = y;
	ActionMove (gw, &ev, (String *) NULL, &zero);
    } else {				/* else just do it */
	pw->panner.tmp.doing = TRUE;
	pw->panner.tmp.x = x;
	pw->panner.tmp.y = y;
	ActionNotify (gw, event, (String *) NULL, &zero);
	pw->panner.tmp.doing = FALSE;
    }
}


/* ARGSUSED */
static void ActionNotify (gw, event, params, num_params)
    Widget gw;
    XEvent *event;			/* unused */
    String *params;			/* unused */
    Cardinal *num_params;		/* unused */
{
    PannerWidget pw = (PannerWidget) gw;

    if (!pw->panner.tmp.doing) return;

    if (!pw->panner.allow_off) check_knob (pw, FALSE);
    pw->panner.knob_x = pw->panner.tmp.x;
    pw->panner.knob_y = pw->panner.tmp.y;
    move_shadow (pw);

    pw->panner.slider_x = (Position) (((double) pw->panner.knob_x) /
				      pw->panner.haspect + 0.5);
    pw->panner.slider_y = (Position) (((double) pw->panner.knob_y) /
				      pw->panner.vaspect + 0.5);
    if (!pw->panner.allow_off) {
	Position tmp;
	
	if (pw->panner.slider_x >
	    (tmp = (((Position) pw->panner.canvas_width) - 
		    ((Position) pw->panner.slider_width))))
	  pw->panner.slider_x = tmp;
	if (pw->panner.slider_x < 0) pw->panner.slider_x = 0;
	if (pw->panner.slider_y >
	    (tmp = (((Position) pw->panner.canvas_height) - 
		    ((Position) pw->panner.slider_height))))
	  pw->panner.slider_y = tmp;
	if (pw->panner.slider_y < 0) pw->panner.slider_y = 0;
    }

    if (pw->panner.last_x != pw->panner.knob_x ||
	pw->panner.last_y != pw->panner.knob_y) {
	XawPannerReport rep;

	Redisplay (gw, (XEvent*) NULL, (Region) NULL);
	rep.changed = (XawPRSliderX | XawPRSliderY);
	rep.slider_x = pw->panner.slider_x;
	rep.slider_y = pw->panner.slider_y;
	rep.slider_width = pw->panner.slider_width;
	rep.slider_height = pw->panner.slider_height;
	rep.canvas_width = pw->panner.canvas_width;
	rep.canvas_height = pw->panner.canvas_height;
	XtCallCallbackList (gw, pw->panner.report_callbacks, (XtPointer) &rep);
    }
}

/* ARGSUSED */
static void ActionSet (gw, event, params, num_params)
    Widget gw;
    XEvent *event;			/* unused */
    String *params;
    Cardinal *num_params;
{
    PannerWidget pw = (PannerWidget) gw;
    Boolean rb;

    if (*num_params < 2 ||
	XmuCompareISOLatin1 (params[0], "rubberband") != 0) {
	XBell (XtDisplay(gw), 0);
	return;
    }

    if (XmuCompareISOLatin1 (params[1], "on") == 0) {
	rb = TRUE;
    } else if (XmuCompareISOLatin1 (params[1], "off") == 0) {
	rb = FALSE;
    } else if (XmuCompareISOLatin1 (params[1], "toggle") == 0) {
	rb = !pw->panner.rubber_band;
    } else {
	XBell (XtDisplay(gw), 0);
	return;
    }

    if (rb != pw->panner.rubber_band) {
	Arg args[1];
	XtSetArg (args[0], XtNrubberBand, rb);
	XtSetValues (gw, args, (Cardinal) 1);
    }
}

