/*
Copyright (c) 1989, 1994  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.
 *
 * Author:  Jim Fulton, MIT X Consortium
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>		/* for XtN and XtC defines */
#include <X11/Xmu/CharSet.h>		/* for XmuCompareISOLatin1() */
#include <X11/Xaw3dxft/XawInit.h>		/* for XawInitializeWidgetSet */
#include <X11/Xaw3dxft/PannerP.h>		/* us */
#include <X11/Xos.h>
#include <X11/Xmu/Misc.h>		/* for Min */
#include <X11/Xmu/Drawing.h>
#include <X11/Xmu/StdCmap.h>		/* for XmuDistinguishablePixels() */
#include <ctype.h>			/* for isascii() etc. */
#include <stdlib.h>			/* for atof() */


#if XtVersion >= 11006
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>KP_Delete: page(-1p,-1p) \n\
   <Key>BackSpace: page(-1p,-1p) \n\
   <Key>Left:     page(-.5p,+0) \n\
   :<Key>KP_Left:  page(-.5p,+0) \n\
   <Key>Right:    page(+.5p,+0) \n\
   :<Key>KP_Right: page(+.5p,+0) \n\
   <Key>Up:       page(+0,-.5p) \n\
   :<Key>KP_Up:    page(+0,-.5p) \n\
   <Key>Down:     page(+0,+.5p) \n\
   :<Key>KP_Down:  page(+0,+.5p) \n\
   <Key>Home:     page(0,0) \n\
   :<Key>KP_Home:  page(0,0)";
#else
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)";
#endif


static void ActionStart(Widget, XEvent *, String *, Cardinal *);
static void ActionStop(Widget, XEvent *, String *, Cardinal *);
static void ActionAbort(Widget, XEvent *, String *, Cardinal *);
static void ActionMove(Widget, XEvent *, String *, Cardinal *);
static void ActionPage(Widget, XEvent *, String *, Cardinal *);
static void ActionNotify(Widget, XEvent *, String *, Cardinal *);
static void ActionSet(Widget, XEvent *, String *, Cardinal *);

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(Widget, Widget, ArgList, Cardinal *);
static void Realize(Widget, XtValueMask *, XSetWindowAttributes *);
static void Destroy(Widget);
static void Resize(Widget);
static void Redisplay(Widget, XEvent *, Region);
static Boolean SetValues(Widget, Widget, Widget, ArgList, Cardinal *);
static void SetValuesAlmost(Widget, Widget, XtWidgetGeometry *, XtWidgetGeometry *);
static XtGeometryResult QueryGeometry(Widget, XtWidgetGeometry *, XtWidgetGeometry *);

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 (PannerWidget pw)	/* used when resources change */
{
    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 (PannerWidget pw)	/* used when resources change */
{
    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 (PannerWidget pw)		/* used when resources change */
{
    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 (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 (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) {
	    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 (PannerWidget pw, Boolean location, Boolean size)  /* set knob size and/or loc */
{
    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 (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 (PannerWidget pw, Dimension *wp, Dimension *hp)
{
    Dimension pad = pw->panner.internal_border * 2;
    *wp = PANNER_DSCALE (pw, pw->panner.canvas_width) + pad;
    *hp = PANNER_DSCALE (pw, pw->panner.canvas_height) + pad;
}

static Boolean
get_event_xy (PannerWidget pw, XEvent *event, int *x, int *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 (char *s, int pagesize, int 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                            *
 *                                                                           *
 *****************************************************************************/


/*ARGSUSED*/
static void
Initialize (Widget greq, Widget 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 (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 (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 (Widget gw)
{
    rescale ((PannerWidget) gw);
}


/* ARGSUSED */
static void
Redisplay (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;

    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);
}


/* ARGSUSED */
static Boolean
SetValues (Widget gcur, Widget greq, Widget 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 (Widget gold, Widget gnew, XtWidgetGeometry *req, XtWidgetGeometry *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 (Widget gw, XtWidgetGeometry *intended, XtWidgetGeometry *pref)
{
    PannerWidget pw = (PannerWidget) gw;

    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)
      return XtGeometryYes;
    else if (pref->width == pw->core.width && pref->height == pw->core.height)
      return XtGeometryNo;
    else
      return XtGeometryAlmost;
}


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

/* ARGSUSED */
static void
ActionStart (Widget gw, XEvent *event, String *params, Cardinal *num_params)
{
    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 (Widget gw, XEvent *event, String *params, Cardinal *num_params)
{
    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 (Widget gw, XEvent *event, String *params, Cardinal *num_params)
{
    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 (Widget gw, XEvent *event, String *params, Cardinal *num_params)
{
    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 (Widget gw, XEvent *event, String *params, Cardinal *num_params)
{
    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 (Widget gw, XEvent *event, String *params, Cardinal *num_params)
{
    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 (Widget gw, XEvent *event, 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);
    }
}
