new file mode 100644
--- /dev/null
+++ b/src/gui_at_sb.c
@@ -0,0 +1,1213 @@
+/* vi:set ts=8 sts=4 sw=4: */
+/*
+ * MODIFIED ATHENA SCROLLBAR (USING ARROWHEADS AT ENDS OF TRAVEL)
+ * Modifications Copyright 1992 by Mitch Trachtenberg
+ * Rights, permissions, and disclaimer of warranty are as in the DEC and MIT
+ * notice below.
+ * $XConsortium: Scrollbar.c,v 1.72 94/04/17 20:12:40 kaleb Exp $
+ */
+
+/*
+ * Modified for Vim by Bill Foster and Bram Moolenaar
+ */
+
+/*
+
+Copyright (c) 1987, 1988, 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.
+
+Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts.
+
+			All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted, provided that
+the above copyright notice appear in all copies and that both that copyright
+notice and this permission notice appear in supporting documentation, and that
+the name of Digital not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DIGITAL
+BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+*/
+
+/* ScrollBar.c */
+/* created by weissman, Mon Jul  7 13:20:03 1986 */
+/* converted by swick, Thu Aug 27 1987 */
+
+#include <X11/IntrinsicP.h>
+#include <X11/StringDefs.h>
+
+#include <X11/Xaw/XawInit.h>
+#include "vim.h"
+#include "gui_at_sb.h"
+
+#include <X11/Xmu/Drawing.h>
+
+/* Private definitions. */
+
+static char defaultTranslations[] =
+    "<Btn1Down>: NotifyScroll()\n\
+     <Btn2Down>: MoveThumb() NotifyThumb()\n\
+     <Btn3Down>: NotifyScroll()\n\
+     <Btn4Down>: ScrollOneLineUp()\n\
+     Shift<Btn4Down>: ScrollPageUp()\n\
+     <Btn5Down>: ScrollOneLineDown()\n\
+     Shift<Btn5Down>: ScrollPageDown()\n\
+     <Btn1Motion>: HandleThumb()\n\
+     <Btn3Motion>: HandleThumb()\n\
+     <Btn2Motion>: MoveThumb() NotifyThumb()\n\
+     <BtnUp>: EndScroll()";
+
+static float floatZero = 0.0;
+
+#define Offset(field) XtOffsetOf(ScrollbarRec, field)
+
+static XtResource resources[] =
+{
+  {XtNlength, XtCLength, XtRDimension, sizeof(Dimension),
+       Offset(scrollbar.length), XtRImmediate, (XtPointer) 1},
+  {XtNthickness, XtCThickness, XtRDimension, sizeof(Dimension),
+       Offset(scrollbar.thickness), XtRImmediate, (XtPointer) 14},
+  {XtNorientation, XtCOrientation, XtROrientation, sizeof(XtOrientation),
+      Offset(scrollbar.orientation), XtRImmediate, (XtPointer) XtorientVertical},
+  {XtNscrollProc, XtCCallback, XtRCallback, sizeof(XtPointer),
+       Offset(scrollbar.scrollProc), XtRCallback, NULL},
+  {XtNthumbProc, XtCCallback, XtRCallback, sizeof(XtPointer),
+       Offset(scrollbar.thumbProc), XtRCallback, NULL},
+  {XtNjumpProc, XtCCallback, XtRCallback, sizeof(XtPointer),
+       Offset(scrollbar.jumpProc), XtRCallback, NULL},
+  {XtNthumb, XtCThumb, XtRBitmap, sizeof(Pixmap),
+       Offset(scrollbar.thumb), XtRImmediate, (XtPointer) XtUnspecifiedPixmap},
+  {XtNforeground, XtCForeground, XtRPixel, sizeof(Pixel),
+       Offset(scrollbar.foreground), XtRString, XtDefaultForeground},
+  {XtNshown, XtCShown, XtRFloat, sizeof(float),
+       Offset(scrollbar.shown), XtRFloat, (XtPointer)&floatZero},
+  {XtNtopOfThumb, XtCTopOfThumb, XtRFloat, sizeof(float),
+       Offset(scrollbar.top), XtRFloat, (XtPointer)&floatZero},
+  {XtNmaxOfThumb, XtCMaxOfThumb, XtRFloat, sizeof(float),
+       Offset(scrollbar.max), XtRFloat, (XtPointer)&floatZero},
+  {XtNminimumThumb, XtCMinimumThumb, XtRDimension, sizeof(Dimension),
+       Offset(scrollbar.min_thumb), XtRImmediate, (XtPointer) 7},
+  {XtNshadowWidth, XtCShadowWidth, XtRDimension, sizeof(Dimension),
+       Offset(scrollbar.shadow_width), XtRImmediate, (XtPointer) 1},
+  {XtNtopShadowPixel, XtCTopShadowPixel, XtRPixel, sizeof(Pixel),
+       Offset(scrollbar.top_shadow_pixel), XtRString, XtDefaultBackground},
+  {XtNbottomShadowPixel, XtCBottomShadowPixel, XtRPixel, sizeof(Pixel),
+       Offset(scrollbar.bot_shadow_pixel), XtRString, XtDefaultForeground},
+  {XtNlimitThumb, XtCLimitThumb, XtRBool, sizeof(Bool),
+       Offset(scrollbar.limit_thumb), XtRImmediate, (XtPointer)0}
+};
+#undef Offset
+
+static void ClassInitialize __ARGS((void));
+static void Initialize __ARGS((Widget, Widget, ArgList, Cardinal *));
+static void Destroy __ARGS((Widget));
+static void Realize __ARGS((Widget, Mask *, XSetWindowAttributes *));
+static void Resize __ARGS((Widget));
+static void Redisplay __ARGS((Widget, XEvent *, Region));
+static Boolean SetValues __ARGS((Widget, Widget, Widget, ArgList, Cardinal *));
+
+static void HandleThumb __ARGS((Widget, XEvent *, String *, Cardinal *));
+static void MoveThumb __ARGS((Widget, XEvent *, String *, Cardinal *));
+static void NotifyThumb __ARGS((Widget, XEvent *, String *, Cardinal *));
+static void NotifyScroll __ARGS((Widget, XEvent *, String *, Cardinal *));
+static void EndScroll __ARGS((Widget, XEvent *, String *, Cardinal *));
+static void ScrollOneLineUp __ARGS((Widget, XEvent *, String *, Cardinal *));
+static void ScrollOneLineDown __ARGS((Widget, XEvent *, String *, Cardinal *));
+static void ScrollPageUp __ARGS((Widget, XEvent *, String *, Cardinal *));
+static void ScrollPageDown __ARGS((Widget, XEvent *, String *, Cardinal *));
+static void ScrollSome __ARGS((Widget w, XEvent *event, int call_data));
+static void _Xaw3dDrawShadows __ARGS((Widget, XEvent *, Region, int));
+static void AllocTopShadowGC __ARGS((Widget));
+static void AllocBotShadowGC __ARGS((Widget));
+
+static XtActionsRec actions[] =
+{
+    {"HandleThumb",	HandleThumb},
+    {"MoveThumb",	MoveThumb},
+    {"NotifyThumb",	NotifyThumb},
+    {"NotifyScroll",	NotifyScroll},
+    {"EndScroll",	EndScroll},
+    {"ScrollOneLineUp", ScrollOneLineUp},
+    {"ScrollOneLineDown", ScrollOneLineDown},
+    {"ScrollPageUp",	ScrollPageUp},
+    {"ScrollPageDown",	ScrollPageDown}
+};
+
+
+ScrollbarClassRec vim_scrollbarClassRec =
+{
+  { /* core fields */
+    /* superclass	*/  (WidgetClass) &simpleClassRec,
+    /* class_name	*/  "Scrollbar",
+    /* size		*/  sizeof(ScrollbarRec),
+    /* class_initialize	*/  ClassInitialize,
+    /* class_part_init	*/  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 */ XtInheritSetValuesAlmost,
+    /* get_values_hook	*/  NULL,
+    /* accept_focus	*/  NULL,
+    /* version		*/  XtVersion,
+    /* callback_private */  NULL,
+    /* tm_table		*/  defaultTranslations,
+    /* query_geometry	*/  XtInheritQueryGeometry,
+    /* display_accelerator*/	XtInheritDisplayAccelerator,
+    /* extension	*/  NULL
+  },
+  { /* simple fields */
+    /* change_sensitive	*/  XtInheritChangeSensitive
+  },
+  { /* scrollbar fields */
+    /* ignore	    */	0
+  }
+};
+
+WidgetClass vim_scrollbarWidgetClass = (WidgetClass)&vim_scrollbarClassRec;
+
+#define NoButton -1
+#define PICKLENGTH(widget, x, y) \
+    ((widget->scrollbar.orientation == XtorientHorizontal) ? (x) : (y))
+#define AT_MIN(x,y)    ((x) < (y) ? (x) : (y))
+#define AT_MAX(x,y)    ((x) > (y) ? (x) : (y))
+
+#define LINE_DELAY	300
+#define PAGE_DELAY	300
+#define LINE_REPEAT	 50
+#define PAGE_REPEAT	250
+
+    static void
+ClassInitialize()
+{
+    XawInitializeWidgetSet();
+    XtAddConverter( XtRString, XtROrientation, XmuCvtStringToOrientation,
+	    (XtConvertArgList)NULL, (Cardinal)0 );
+}
+
+#define MARGIN(sbw) (sbw)->scrollbar.thickness + (sbw)->scrollbar.shadow_width
+
+    static void
+FillArea(sbw, top, bottom, fill, draw_shadow)
+    ScrollbarWidget	sbw;
+    Position		top, bottom;
+    int			fill;
+    int			draw_shadow;
+{
+    int tlen = bottom - top;	/* length of thumb in pixels */
+    int sw, margin, floor;
+    int lx, ly, lw, lh;
+
+    if (bottom <= 0 || bottom <= top)
+	return;
+    if ((sw = sbw->scrollbar.shadow_width) < 0)
+	sw = 0;
+    margin = MARGIN (sbw);
+    floor = sbw->scrollbar.length - margin + 2;
+
+    if (sbw->scrollbar.orientation == XtorientHorizontal)
+    {
+	lx = ((top < margin) ? margin : top);
+	ly = sw;
+	lw = (((top + tlen) > floor) ? floor - top : tlen);
+	lh = sbw->core.height - 2 * sw;
+    }
+    else
+    {
+	lx = sw;
+	ly = ((top < margin) ? margin : top);
+	lw = sbw->core.width - 2 * sw;
+	lh = (((top + tlen) > floor) ? floor - top : tlen);
+    }
+    if (lh <= 0 || lw <= 0)
+	return;
+
+    if (draw_shadow)
+    {
+	if (!(sbw->scrollbar.orientation == XtorientHorizontal))
+	{
+	    /* Top border */
+	    XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		    sbw->scrollbar.top_shadow_GC,
+		    lx, ly, lx + lw - 1, ly);
+
+	    /* Bottom border */
+	    XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		    sbw->scrollbar.bot_shadow_GC,
+		    lx, ly + lh - 1, lx + lw - 1, ly + lh - 1);
+	}
+	else
+	{
+	    /* Left border */
+	    XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		    sbw->scrollbar.top_shadow_GC,
+		    lx, ly, lx, ly + lh - 1);
+
+	    /* Right border */
+	    XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		    sbw->scrollbar.bot_shadow_GC,
+		    lx + lw - 1, ly, lx + lw - 1, ly + lh - 1);
+	}
+	return;
+    }
+
+    if (fill)
+    {
+	XFillRectangle(XtDisplay((Widget) sbw), XtWindow((Widget) sbw),
+		sbw->scrollbar.gc,
+		lx, ly, (unsigned int) lw, (unsigned int) lh);
+
+	if (!(sbw->scrollbar.orientation == XtorientHorizontal))
+	{
+	    /* Left border */
+	    XDrawLine(XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		    sbw->scrollbar.top_shadow_GC,
+		    lx, ly, lx, ly + lh - 1);
+
+	    /* Right border */
+	    XDrawLine(XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		    sbw->scrollbar.bot_shadow_GC,
+		    lx + lw - 1, ly, lx + lw - 1, ly + lh - 1);
+	}
+	else
+	{
+	    /* Top border */
+	    XDrawLine(XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		    sbw->scrollbar.top_shadow_GC,
+		    lx, ly, lx + lw - 1, ly);
+
+	    /* Bottom border */
+	    XDrawLine(XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		    sbw->scrollbar.bot_shadow_GC,
+		    lx, ly + lh - 1, lx + lw - 1, ly + lh - 1);
+	}
+    }
+    else
+    {
+	XClearArea(XtDisplay((Widget) sbw), XtWindow((Widget) sbw),
+		lx, ly, (unsigned int) lw, (unsigned int) lh, FALSE);
+    }
+}
+
+/* Paint the thumb in the area specified by sbw->top and
+   sbw->shown.	The old area is erased.  The painting and
+   erasing is done cleverly so that no flickering will occur.
+ */
+
+    static void
+PaintThumb(sbw)
+    ScrollbarWidget sbw;
+{
+    Position	    oldtop, oldbot, newtop, newbot;
+    Dimension	    margin, tzl;
+
+    margin = MARGIN (sbw);
+    tzl = sbw->scrollbar.length - 2 * margin;
+    newtop = margin + (int)(tzl * sbw->scrollbar.top);
+    newbot = newtop + (int)(tzl * sbw->scrollbar.shown) + 1;
+    if (newbot < newtop + (int)sbw->scrollbar.min_thumb)
+	newbot = newtop + sbw->scrollbar.min_thumb;
+
+    oldtop = sbw->scrollbar.topLoc;
+    oldbot = oldtop + sbw->scrollbar.shownLength;
+    sbw->scrollbar.topLoc = newtop;
+    sbw->scrollbar.shownLength = newbot - newtop;
+    if (XtIsRealized ((Widget) sbw))
+    {
+	if (newtop < oldtop)
+	    FillArea(sbw, newtop, AT_MIN(newbot,	oldtop+1),1,0);
+	if (newtop > oldtop)
+	    FillArea(sbw, oldtop, AT_MIN(newtop,	oldbot	),0,0);
+	if (newbot < oldbot)
+	    FillArea(sbw, AT_MAX(newbot, oldtop),	oldbot,   0,0);
+	if (newbot > oldbot)
+	    FillArea(sbw, AT_MAX(newtop, oldbot-1), newbot,  1,0);
+
+	/* Only draw the missing shadows */
+	FillArea(sbw, newtop, newbot, 0, 1);
+    }
+}
+
+    static void
+PaintArrows(sbw)
+    ScrollbarWidget sbw;
+{
+    XPoint	point[6];
+    Dimension	thickness = sbw->scrollbar.thickness - 1;
+    Dimension	size;
+    Dimension	off;
+
+    if (XtIsRealized((Widget) sbw))
+    {
+	if ((int)thickness * 2 > (int)sbw->scrollbar.length)
+	{
+	    size = sbw->scrollbar.length / 2;
+	    off = (int)(thickness - size) / 2;
+	}
+	else
+	{
+	    size = thickness;
+	    off = 0;
+	}
+	point[0].x = off + sbw->scrollbar.shadow_width;
+	point[0].y = size;
+	point[1].x = thickness - off - sbw->scrollbar.shadow_width;
+	point[1].y = size;
+	point[2].x = thickness / 2;
+	point[2].y = sbw->scrollbar.shadow_width;
+
+	point[3].x = off + sbw->scrollbar.shadow_width;
+	point[3].y = sbw->scrollbar.length - size;
+	point[4].x = thickness - off - sbw->scrollbar.shadow_width;
+	point[4].y = sbw->scrollbar.length - size;
+	point[5].x = thickness / 2;
+	point[5].y = sbw->scrollbar.length - sbw->scrollbar.shadow_width - 1;
+
+	/* horizontal arrows require that x and y coordinates be swapped */
+	if (sbw->scrollbar.orientation == XtorientHorizontal)
+	{
+	    int n;
+	    int swap;
+	    for (n = 0; n < 6; n++)
+	    {
+		swap = point[n].x;
+		point[n].x = point[n].y;
+		point[n].y = swap;
+	    }
+	}
+	/* draw the up/left arrow */
+	XFillPolygon (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		sbw->scrollbar.gc,
+		point, 3,
+		Convex, CoordModeOrigin);
+	XDrawLines (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		sbw->scrollbar.bot_shadow_GC,
+		point, 3,
+		CoordModeOrigin);
+	XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		sbw->scrollbar.top_shadow_GC,
+		point[0].x, point[0].y,
+		point[2].x, point[2].y);
+	/* draw the down/right arrow */
+	XFillPolygon (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		sbw->scrollbar.gc,
+		point+3, 3,
+		Convex, CoordModeOrigin);
+	XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		sbw->scrollbar.top_shadow_GC,
+		point[3].x, point[3].y,
+		point[4].x, point[4].y);
+	XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		sbw->scrollbar.top_shadow_GC,
+		point[3].x, point[3].y,
+		point[5].x, point[5].y);
+	XDrawLine (XtDisplay ((Widget) sbw), XtWindow ((Widget) sbw),
+		sbw->scrollbar.bot_shadow_GC,
+		point[4].x, point[4].y,
+		point[5].x, point[5].y);
+    }
+}
+
+    static void
+Destroy(w)
+    Widget w;
+{
+    ScrollbarWidget sbw = (ScrollbarWidget) w;
+    if (sbw->scrollbar.timer_id != (XtIntervalId) 0)
+	XtRemoveTimeOut (sbw->scrollbar.timer_id);
+    XtReleaseGC(w, sbw->scrollbar.gc);
+    XtReleaseGC(w, sbw->scrollbar.top_shadow_GC);
+    XtReleaseGC(w, sbw->scrollbar.bot_shadow_GC);
+}
+
+    static void
+CreateGC(w)
+    Widget w;
+{
+    ScrollbarWidget	sbw = (ScrollbarWidget) w;
+    XGCValues		gcValues;
+    XtGCMask		mask;
+    unsigned int	depth = 1;
+
+    if (sbw->scrollbar.thumb == XtUnspecifiedPixmap)
+    {
+	sbw->scrollbar.thumb = XmuCreateStippledPixmap (XtScreen(w),
+		    (Pixel) 1, (Pixel) 0, depth);
+    }
+    else if (sbw->scrollbar.thumb != None)
+    {
+	Window		root;
+	int		x, y;
+	unsigned int	width, height, bw;
+
+	if (XGetGeometry (XtDisplay(w), sbw->scrollbar.thumb, &root, &x, &y,
+		&width, &height, &bw, &depth) == 0)
+	    EMSG(_("Scrollbar Widget: Could not get geometry of thumb pixmap."));
+    }
+
+    gcValues.foreground = sbw->scrollbar.foreground;
+    gcValues.background = sbw->core.background_pixel;
+    mask = GCForeground | GCBackground;
+
+    if (sbw->scrollbar.thumb != None)
+    {
+	gcValues.fill_style = FillSolid;
+	mask |= GCFillStyle;
+    }
+    /* the creation should be non-caching, because */
+    /* we now set and clear clip masks on the gc returned */
+    sbw->scrollbar.gc = XtGetGC (w, mask, &gcValues);
+}
+
+    static void
+SetDimensions(sbw)
+    ScrollbarWidget sbw;
+{
+    if (sbw->scrollbar.orientation == XtorientVertical)
+    {
+	sbw->scrollbar.length = sbw->core.height;
+	sbw->scrollbar.thickness = sbw->core.width;
+    }
+    else
+    {
+	sbw->scrollbar.length = sbw->core.width;
+	sbw->scrollbar.thickness = sbw->core.height;
+    }
+}
+
+/* ARGSUSED */
+    static void
+Initialize(request, new, args, num_args)
+    Widget	request;	/* what the client asked for */
+    Widget	new;		/* what we're going to give him */
+    ArgList	args;
+    Cardinal	*num_args;
+{
+    ScrollbarWidget sbw = (ScrollbarWidget) new;
+
+    CreateGC(new);
+    AllocTopShadowGC(new);
+    AllocBotShadowGC(new);
+
+    if (sbw->core.width == 0)
+	sbw->core.width = (sbw->scrollbar.orientation == XtorientVertical)
+	    ? sbw->scrollbar.thickness : sbw->scrollbar.length;
+
+    if (sbw->core.height == 0)
+	sbw->core.height = (sbw->scrollbar.orientation == XtorientHorizontal)
+	    ? sbw->scrollbar.thickness : sbw->scrollbar.length;
+
+    SetDimensions(sbw);
+    sbw->scrollbar.scroll_mode = SMODE_NONE;
+    sbw->scrollbar.timer_id = (XtIntervalId)0;
+    sbw->scrollbar.topLoc = 0;
+    sbw->scrollbar.shownLength = sbw->scrollbar.min_thumb;
+}
+
+    static void
+Realize(w, valueMask, attributes)
+    Widget w;
+    Mask *valueMask;
+    XSetWindowAttributes *attributes;
+{
+    /* The Simple widget actually stuffs the value in the valuemask. */
+    (*vim_scrollbarWidgetClass->core_class.superclass->core_class.realize)
+	(w, valueMask, attributes);
+}
+
+/* ARGSUSED */
+    static Boolean
+SetValues(current, request, desired, args, num_args)
+    Widget  current,	    /* what I am */
+	    request,	    /* what he wants me to be */
+	    desired;	    /* what I will become */
+    ArgList args;
+    Cardinal *num_args;
+{
+    ScrollbarWidget	sbw = (ScrollbarWidget) current;
+    ScrollbarWidget	dsbw = (ScrollbarWidget) desired;
+    Boolean		redraw = FALSE;
+
+/*
+ * If these values are outside the acceptable range ignore them...
+ */
+    if (dsbw->scrollbar.top < 0.0 || dsbw->scrollbar.top > 1.0)
+	dsbw->scrollbar.top = sbw->scrollbar.top;
+
+    if (dsbw->scrollbar.shown < 0.0 || dsbw->scrollbar.shown > 1.0)
+	dsbw->scrollbar.shown = sbw->scrollbar.shown;
+
+/*
+ * Change colors and stuff...
+ */
+    if (XtIsRealized(desired))
+    {
+	if (sbw->scrollbar.foreground != dsbw->scrollbar.foreground ||
+		sbw->core.background_pixel != dsbw->core.background_pixel ||
+		sbw->scrollbar.thumb != dsbw->scrollbar.thumb)
+	{
+	    XtReleaseGC(desired, sbw->scrollbar.gc);
+	    CreateGC (desired);
+	    redraw = TRUE;
+	}
+	if (sbw->scrollbar.top != dsbw->scrollbar.top ||
+		sbw->scrollbar.shown != dsbw->scrollbar.shown)
+	    redraw = TRUE;
+    }
+    return redraw;
+}
+
+    static void
+Resize(w)
+    Widget w;
+{
+    /* ForgetGravity has taken care of background, but thumb may
+     * have to move as a result of the new size. */
+    SetDimensions ((ScrollbarWidget) w);
+    Redisplay(w, (XEvent*) NULL, (Region)NULL);
+}
+
+
+/* ARGSUSED */
+    static void
+Redisplay(w, event, region)
+    Widget w;
+    XEvent *event;
+    Region region;
+{
+    ScrollbarWidget sbw = (ScrollbarWidget) w;
+    int x, y;
+    unsigned int width, height;
+
+    _Xaw3dDrawShadows(w, event, region, FALSE);
+
+    if (sbw->scrollbar.orientation == XtorientHorizontal)
+    {
+	x = sbw->scrollbar.topLoc;
+	y = 1;
+	width = sbw->scrollbar.shownLength;
+	height = sbw->core.height - 2;
+    }
+    else
+    {
+	x = 1;
+	y = sbw->scrollbar.topLoc;
+	width = sbw->core.width - 2;
+	height = sbw->scrollbar.shownLength;
+    }
+    if (region == NULL ||
+	    XRectInRegion (region, x, y, width, height) != RectangleOut)
+    {
+	/* Forces entire thumb to be painted. */
+	sbw->scrollbar.topLoc = -(sbw->scrollbar.length + 1);
+	PaintThumb (sbw);
+    }
+    /* we'd like to be region aware here!!!! */
+    PaintArrows(sbw);
+}
+
+
+    static Boolean
+CompareEvents(oldEvent, newEvent)
+    XEvent *oldEvent, *newEvent;
+{
+#define Check(field) if (newEvent->field != oldEvent->field) return False;
+
+    Check(xany.display);
+    Check(xany.type);
+    Check(xany.window);
+
+    switch (newEvent->type)
+    {
+	case MotionNotify:
+	    Check(xmotion.state);
+	    break;
+	case ButtonPress:
+	case ButtonRelease:
+	    Check(xbutton.state);
+	    Check(xbutton.button);
+	    break;
+	case KeyPress:
+	case KeyRelease:
+	    Check(xkey.state);
+	    Check(xkey.keycode);
+	    break;
+	case EnterNotify:
+	case LeaveNotify:
+	    Check(xcrossing.mode);
+	    Check(xcrossing.detail);
+	    Check(xcrossing.state);
+	    break;
+    }
+#undef Check
+
+    return True;
+}
+
+struct EventData
+{
+    XEvent *oldEvent;
+    int count;
+};
+
+    static Bool
+PeekNotifyEvent(dpy, event, args)
+    Display *dpy;
+    XEvent *event;
+    char *args;
+{
+    struct EventData *eventData = (struct EventData*)args;
+
+    return ((++eventData->count == QLength(dpy)) /* since PeekIf blocks */
+	|| CompareEvents(event, eventData->oldEvent));
+}
+
+
+    static Boolean
+LookAhead(w, event)
+    Widget w;
+    XEvent *event;
+{
+    XEvent newEvent;
+    struct EventData eventData;
+
+    if (QLength (XtDisplay (w)) == 0)
+	return False;
+
+    eventData.count = 0;
+    eventData.oldEvent = event;
+
+    XPeekIfEvent (XtDisplay (w), &newEvent, PeekNotifyEvent, (char*)&eventData);
+
+    return CompareEvents (event, &newEvent);
+}
+
+
+    static void
+ExtractPosition(event, x, y, state)
+    XEvent	    *event;
+    Position	    *x, *y;	/* RETURN */
+    unsigned int    *state;	/* RETURN */
+{
+    switch (event->type)
+    {
+	case MotionNotify:
+	    *x = event->xmotion.x;
+	    *y = event->xmotion.y;
+	    if (state != NULL)
+		*state = event->xmotion.state;
+	    break;
+	case ButtonPress:
+	case ButtonRelease:
+	    *x = event->xbutton.x;
+	    *y = event->xbutton.y;
+	    if (state != NULL)
+		*state = event->xbutton.state;
+	    break;
+	case KeyPress:
+	case KeyRelease:
+	    *x = event->xkey.x;
+	    *y = event->xkey.y;
+	    if (state != NULL)
+		*state = event->xkey.state;
+	    break;
+	case EnterNotify:
+	case LeaveNotify:
+	    *x = event->xcrossing.x;
+	    *y = event->xcrossing.y;
+	    if (state != NULL)
+		*state = event->xcrossing.state;
+	    break;
+	default:
+	    *x = 0; *y = 0;
+	    if (state != NULL)
+		*state = 0;
+    }
+}
+
+    static void
+HandleThumb(w, event, params, num_params)
+    Widget w;
+    XEvent *event;
+    String *params;
+    Cardinal *num_params;
+{
+    Position x, y, loc;
+    ScrollbarWidget sbw = (ScrollbarWidget) w;
+
+    ExtractPosition(event, &x, &y, (unsigned int *)NULL);
+    loc = PICKLENGTH(sbw, x, y);
+    /* if the motion event puts the pointer in thumb, call Move and Notify */
+    /* also call Move and Notify if we're already in continuous scroll mode */
+    if (sbw->scrollbar.scroll_mode == SMODE_CONT ||
+	    (loc >= sbw->scrollbar.topLoc &&
+	     loc <= sbw->scrollbar.topLoc + (int)sbw->scrollbar.shownLength))
+    {
+	XtCallActionProc(w, "MoveThumb", event, params, *num_params);
+	XtCallActionProc(w, "NotifyThumb", event, params, *num_params);
+    }
+}
+
+/* ARGSUSED */
+    static void
+RepeatNotify(client_data, idp)
+    XtPointer client_data;
+    XtIntervalId *idp;
+{
+    ScrollbarWidget sbw = (ScrollbarWidget) client_data;
+    int		    call_data;
+    char	    mode = sbw->scrollbar.scroll_mode;
+    unsigned long   rep;
+
+    if (mode == SMODE_NONE || mode == SMODE_CONT)
+    {
+	sbw->scrollbar.timer_id = (XtIntervalId)0;
+	return;
+    }
+
+    if (mode == SMODE_LINE_DOWN || mode == SMODE_LINE_UP)
+    {
+	call_data = ONE_LINE_DATA;
+	rep = LINE_REPEAT;
+    }
+    else
+    {
+	call_data = ONE_PAGE_DATA;
+	rep = PAGE_REPEAT;
+    }
+
+    if (mode == SMODE_PAGE_UP || mode == SMODE_LINE_UP)
+	call_data = -call_data;
+
+    XtCallCallbacks((Widget)sbw, XtNscrollProc, (XtPointer)call_data);
+
+    sbw->scrollbar.timer_id =
+	XtAppAddTimeOut(XtWidgetToApplicationContext((Widget)sbw),
+		rep,
+		RepeatNotify,
+		client_data);
+}
+
+/*
+ * Same as above, but for floating numbers.
+ */
+    static float
+FloatInRange(num, small, big)
+    float num, small, big;
+{
+    return (num < small) ? small : ((num > big) ? big : num);
+}
+
+/* ARGSUSED */
+    static void
+ScrollOneLineUp(w, event, params, num_params)
+    Widget	w;
+    XEvent	*event;
+    String	*params;
+    Cardinal	*num_params;
+{
+    ScrollSome(w, event, -ONE_LINE_DATA);
+}
+
+/* ARGSUSED */
+    static void
+ScrollOneLineDown(w, event, params, num_params)
+    Widget	w;
+    XEvent	*event;
+    String	*params;
+    Cardinal	*num_params;
+{
+    ScrollSome(w, event, ONE_LINE_DATA);
+}
+
+/* ARGSUSED */
+    static void
+ScrollPageDown(w, event, params, num_params)
+    Widget	w;
+    XEvent	*event;
+    String	*params;
+    Cardinal	*num_params;
+{
+    ScrollSome(w, event, ONE_PAGE_DATA);
+}
+
+/* ARGSUSED */
+    static void
+ScrollPageUp(w, event, params, num_params)
+    Widget	w;
+    XEvent	*event;
+    String	*params;
+    Cardinal	*num_params;
+{
+    ScrollSome(w, event, -ONE_PAGE_DATA);
+}
+
+    static void
+ScrollSome(w, event, call_data)
+    Widget	w;
+    XEvent	*event;
+    int		call_data;
+{
+    ScrollbarWidget	sbw = (ScrollbarWidget) w;
+
+    if (sbw->scrollbar.scroll_mode == SMODE_CONT)   /* if scroll continuous */
+	return;
+
+    if (LookAhead(w, event))
+	return;
+
+    sbw->scrollbar.scroll_mode = SMODE_LINE_UP;
+    XtCallCallbacks(w, XtNscrollProc, (XtPointer)call_data);
+}
+
+/* ARGSUSED */
+    static void
+NotifyScroll(w, event, params, num_params)
+    Widget	w;
+    XEvent	*event;
+    String	*params;
+    Cardinal	*num_params;
+{
+    ScrollbarWidget sbw = (ScrollbarWidget) w;
+    Position	    x, y, loc;
+    Dimension	    arrow_size;
+    unsigned long   delay = 0;
+    int		    call_data = 0;
+    unsigned int    state;
+
+    if (sbw->scrollbar.scroll_mode == SMODE_CONT)   /* if scroll continuous */
+	return;
+
+    if (LookAhead (w, event))
+	return;
+
+    ExtractPosition(event, &x, &y, &state);
+    loc = PICKLENGTH(sbw, x, y);
+
+    if ((int)sbw->scrollbar.thickness * 2 > (int)sbw->scrollbar.length)
+	arrow_size = sbw->scrollbar.length / 2;
+    else
+	arrow_size = sbw->scrollbar.thickness;
+
+    /*
+     * handle CTRL modifier
+     */
+    if (state & ControlMask)
+    {
+	if (loc > sbw->scrollbar.topLoc + (Position)sbw->scrollbar.shownLength)
+	    call_data = END_PAGE_DATA;
+	else
+	    call_data = -END_PAGE_DATA;
+	sbw->scrollbar.scroll_mode = SMODE_NONE;
+    }
+    /*
+     * handle first arrow zone
+     */
+    else if (loc < (Position)arrow_size)
+    {
+	call_data = -ONE_LINE_DATA;
+	sbw->scrollbar.scroll_mode = SMODE_LINE_UP;
+	delay = LINE_DELAY;
+    }
+
+    /*
+     * handle last arrow zone
+     */
+    else if (loc > (Position)(sbw->scrollbar.length - arrow_size))
+    {
+	call_data = ONE_LINE_DATA;
+	sbw->scrollbar.scroll_mode = SMODE_LINE_DOWN;
+	delay = LINE_DELAY;
+    }
+
+    /*
+     * handle zone "above" the thumb
+     */
+    else if (loc < sbw->scrollbar.topLoc)
+    {
+	call_data = -ONE_PAGE_DATA;
+	sbw->scrollbar.scroll_mode = SMODE_PAGE_UP;
+	delay = PAGE_DELAY;
+    }
+
+    /*
+     * handle zone "below" the thumb
+     */
+    else if (loc > sbw->scrollbar.topLoc + (Position)sbw->scrollbar.shownLength)
+    {
+	call_data = ONE_PAGE_DATA;
+	sbw->scrollbar.scroll_mode = SMODE_PAGE_DOWN;
+	delay = PAGE_DELAY;
+    }
+
+    if (call_data)
+	XtCallCallbacks(w, XtNscrollProc, (XtPointer)call_data);
+
+    /* establish autoscroll */
+    if (delay)
+	sbw->scrollbar.timer_id =
+	    XtAppAddTimeOut(XtWidgetToApplicationContext(w),
+					   delay, RepeatNotify, (XtPointer)w);
+}
+
+/* ARGSUSED */
+    static void
+EndScroll(w, event, params, num_params)
+    Widget w;
+    XEvent *event;	/* unused */
+    String *params;	/* unused */
+    Cardinal *num_params;   /* unused */
+{
+    ScrollbarWidget sbw = (ScrollbarWidget) w;
+
+    sbw->scrollbar.scroll_mode = SMODE_NONE;
+    /* no need to remove any autoscroll timeout; it will no-op */
+    /* because the scroll_mode is SMODE_NONE */
+    /* but be sure to remove timeout in destroy proc */
+}
+
+    static float
+FractionLoc(sbw, x, y)
+    ScrollbarWidget sbw;
+    int x, y;
+{
+    int	    margin;
+    float   height, width;
+
+    margin = MARGIN(sbw);
+    x -= margin;
+    y -= margin;
+    height = (float)sbw->core.height - 2 * margin;
+    width = (float)sbw->core.width - 2 * margin;
+    return PICKLENGTH(sbw, x / width, y / height);
+}
+
+/* ARGSUSED */
+    static void
+MoveThumb(w, event, params, num_params)
+    Widget	w;
+    XEvent	*event;
+    String	*params;	/* unused */
+    Cardinal	*num_params;	/* unused */
+{
+    ScrollbarWidget	sbw = (ScrollbarWidget)w;
+    Position		x, y;
+    float		top;
+    char		old_mode = sbw->scrollbar.scroll_mode;
+
+    sbw->scrollbar.scroll_mode = SMODE_CONT; /* indicate continuous scroll */
+
+    if (LookAhead(w, event))
+	return;
+
+    if (!event->xmotion.same_screen)
+	return;
+
+    ExtractPosition(event, &x, &y, (unsigned int *)NULL);
+
+    top = FractionLoc(sbw, x, y);
+
+    if (old_mode != SMODE_CONT)		    /* start dragging: set offset */
+    {
+	if (event->xbutton.button == Button2)
+	    sbw->scrollbar.scroll_off = sbw->scrollbar.shown / 2.;
+	else
+	    sbw->scrollbar.scroll_off = top - sbw->scrollbar.top;
+    }
+
+    top -= sbw->scrollbar.scroll_off;
+    if (sbw->scrollbar.limit_thumb)
+	top = FloatInRange(top, 0.0,
+			sbw->scrollbar.max - sbw->scrollbar.shown + 0.000001);
+    else
+	top = FloatInRange(top, 0.0, sbw->scrollbar.max);
+
+    sbw->scrollbar.top = top;
+    PaintThumb(sbw);
+    XFlush(XtDisplay(w));   /* re-draw it before Notifying */
+}
+
+
+/* ARGSUSED */
+    static void
+NotifyThumb(w, event, params, num_params)
+    Widget	w;
+    XEvent	*event;
+    String	*params;	/* unused */
+    Cardinal	*num_params;	/* unused */
+{
+    ScrollbarWidget sbw = (ScrollbarWidget)w;
+
+    if (LookAhead(w, event))
+	return;
+
+    /* thumbProc is not pretty, but is necessary for backwards
+       compatibility on those architectures for which it work{s,ed};
+       the intent is to pass a (truncated) float by value. */
+    XtCallCallbacks(w, XtNthumbProc, *(XtPointer*)&sbw->scrollbar.top);
+    XtCallCallbacks(w, XtNjumpProc, (XtPointer)&sbw->scrollbar.top);
+}
+
+/* ARGSUSED */
+    static void
+AllocTopShadowGC(w)
+    Widget w;
+{
+    ScrollbarWidget sbw = (ScrollbarWidget) w;
+    XtGCMask	    valuemask;
+    XGCValues	    myXGCV;
+
+    valuemask = GCForeground;
+    myXGCV.foreground = sbw->scrollbar.top_shadow_pixel;
+    sbw->scrollbar.top_shadow_GC = XtGetGC(w, valuemask, &myXGCV);
+}
+
+/* ARGSUSED */
+    static void
+AllocBotShadowGC(w)
+    Widget w;
+{
+    ScrollbarWidget sbw = (ScrollbarWidget) w;
+    XtGCMask	    valuemask;
+    XGCValues	    myXGCV;
+
+    valuemask = GCForeground;
+    myXGCV.foreground = sbw->scrollbar.bot_shadow_pixel;
+    sbw->scrollbar.bot_shadow_GC = XtGetGC(w, valuemask, &myXGCV);
+}
+
+/* ARGSUSED */
+    static void
+_Xaw3dDrawShadows(gw, event, region, out)
+    Widget  gw;
+    XEvent  *event;
+    Region  region;
+    int	    out;
+{
+    XPoint  pt[6];
+    ScrollbarWidget sbw = (ScrollbarWidget) gw;
+    Dimension	s = sbw->scrollbar.shadow_width;
+    /*
+     * draw the shadows using the core part width and height,
+     * and the scrollbar part shadow_width.
+     *
+     *	no point to do anything if the shadow_width is 0 or the
+     *	widget has not been realized.
+     */
+    if (s > 0 && XtIsRealized(gw))
+    {
+	Dimension   h = sbw->core.height;
+	Dimension   w = sbw->core.width;
+	Dimension   wms = w - s;
+	Dimension   hms = h - s;
+	Display	    *dpy = XtDisplay (gw);
+	Window	    win = XtWindow (gw);
+	GC	top, bot;
+
+	if (out)
+	{
+	    top = sbw->scrollbar.top_shadow_GC;
+	    bot = sbw->scrollbar.bot_shadow_GC;
+	}
+	else
+	{
+	    top = sbw->scrollbar.bot_shadow_GC;
+	    bot = sbw->scrollbar.top_shadow_GC;
+	}
+
+	/* top-left shadow */
+	if ((region == NULL) ||
+		(XRectInRegion (region, 0, 0, w, s) != RectangleOut) ||
+		(XRectInRegion (region, 0, 0, s, h) != RectangleOut))
+	{
+	    pt[0].x = 0;    pt[0].y = h;
+	    pt[1].x =	    pt[1].y = 0;
+	    pt[2].x = w;    pt[2].y = 0;
+	    pt[3].x = wms;  pt[3].y = s;
+	    pt[4].x =	    pt[4].y = s;
+	    pt[5].x = s;    pt[5].y = hms;
+	    XFillPolygon (dpy, win, top, pt, 6, Complex, CoordModeOrigin);
+	}
+
+	/* bottom-right shadow */
+	if ((region == NULL) ||
+		(XRectInRegion (region, 0, hms, w, s) != RectangleOut) ||
+		(XRectInRegion (region, wms, 0, s, h) != RectangleOut))
+	{
+	    pt[0].x = 0;    pt[0].y = h;
+	    pt[1].x = w;    pt[1].y = h;
+	    pt[2].x = w;    pt[2].y = 0;
+	    pt[3].x = wms;  pt[3].y = s;
+	    pt[4].x = wms;  pt[4].y = hms;
+	    pt[5].x = s;    pt[5].y = hms;
+	    XFillPolygon (dpy, win, bot, pt, 6, Complex, CoordModeOrigin);
+	}
+    }
+}
+
+
+/*
+ * Set the scroll bar to the given location.
+ */
+    void
+vim_XawScrollbarSetThumb(w, top, shown, max)
+    Widget w;
+    double top, shown, max;
+{
+    ScrollbarWidget sbw = (ScrollbarWidget) w;
+
+    if (sbw->scrollbar.scroll_mode == SMODE_CONT) /* if still thumbing */
+	return;
+
+    sbw->scrollbar.max = (max > 1.0) ? 1.0 :
+		(max >= 0.0) ? max : sbw->scrollbar.max;
+
+    sbw->scrollbar.top = (top > sbw->scrollbar.max) ? sbw->scrollbar.max :
+		(top >= 0.0) ? top : sbw->scrollbar.top;
+
+    sbw->scrollbar.shown = (shown > 1.0) ? 1.0 :
+		(shown >= 0.0) ? shown : sbw->scrollbar.shown;
+
+    PaintThumb(sbw);
+}