Panner.c

Go to the documentation of this file.

/*
 * $XConsortium: Panner.c,v 1.52 95/01/10 14:31:26 kaleb Exp $
 *
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
 */

#include <X11/IntrinsicP.h>
#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/Xos.h>
#include <X11/Xmu/Misc.h>               /* for Min */
#include <X11/Xmu/Drawing.h>
#include <ctype.h>                      /* for isascii() etc. */
#include <math.h>                       /* for atof() */

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

#if defined(ISC) && __STDC__ && !defined(ISC30)
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>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)";


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)
    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)
    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 (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;
    *wp = PANNER_DSCALE (pw, pw->panner.canvas_width) + pad;
    *hp = PANNER_DSCALE (pw, pw->panner.canvas_height) + pad;
}

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)
    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                            *
 *                                                                           *
 *****************************************************************************/


/*ARGSUSED*/
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;

    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 (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;
{
    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 (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);
    }
}

---