--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/scrollbar-x.c	Mon Aug 13 11:28:15 2007 +0200
@@ -0,0 +1,753 @@
+/* scrollbar implementation -- X interface.
+   Copyright (C) 1994, 1995 Board of Trustees, University of Illinois.
+   Copyright (C) 1994 Amdahl Corporation.
+   Copyright (C) 1995 Sun Microsystems, Inc.
+   Copyright (C) 1995 Darrell Kindred <dkindred+@cmu.edu>.
+
+This file is part of XEmacs.
+
+XEmacs is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+XEmacs is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* Synched up with: Not in FSF. */
+
+#include <config.h>
+#include "lisp.h"
+
+#include "console-x.h"
+#include "EmacsFrame.h"
+#include "glyphs-x.h"
+#include "gui-x.h"
+#include "scrollbar-x.h"
+
+#include "frame.h"
+#include "window.h"
+
+static void x_update_vertical_scrollbar_callback (Widget widget, LWLIB_ID id,
+						  XtPointer client_data);
+static void x_update_horizontal_scrollbar_callback (Widget widget, LWLIB_ID id,
+						    XtPointer client_data);
+
+/* Used to prevent changing the size of the slider while drag
+   scrolling, under Motif.  This is necessary because the Motif
+   scrollbar is incredibly stupid about updating the slider and causes
+   lots of flicker if it is done too often.  */
+static int inhibit_slider_size_change;
+int stupid_vertical_scrollbar_drag_hack;
+
+/* Doesn't work with athena */
+#if defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_LUCID)
+static int vertical_drag_in_progress;
+#endif
+
+
+/* A device method. */
+static int
+x_inhibit_scrollbar_slider_size_change (void)
+{
+  /* Doesn't work with Athena */
+#if defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_LUCID)
+  return inhibit_slider_size_change;
+#else
+  return 0;
+#endif
+}
+
+/* A device method. */
+static void
+x_free_scrollbar_instance (struct scrollbar_instance *instance)
+{
+  if (SCROLLBAR_X_NAME (instance))
+    xfree (SCROLLBAR_X_NAME (instance));
+
+  if (SCROLLBAR_X_WIDGET (instance))
+    {
+      if (XtIsManaged (SCROLLBAR_X_WIDGET (instance)))
+	XtUnmanageChild (SCROLLBAR_X_WIDGET (instance));
+
+      lw_destroy_all_widgets (SCROLLBAR_X_ID (instance));
+    }
+
+  if (instance->scrollbar_data)
+    xfree (instance->scrollbar_data);
+}
+
+/* A device method. */
+static void
+x_release_scrollbar_instance (struct scrollbar_instance *instance)
+{
+  if (XtIsManaged (SCROLLBAR_X_WIDGET (instance)))
+    XtUnmanageChild (SCROLLBAR_X_WIDGET (instance));
+}
+
+/* A device method. */
+static void
+x_create_scrollbar_instance (struct frame *f, int vertical,
+			     struct scrollbar_instance *instance)
+{
+  char buffer[32];
+
+  /* initialize the X specific data section. */
+  instance->scrollbar_data = xnew_and_zero (struct x_scrollbar_data);
+
+  SCROLLBAR_X_ID (instance) = new_lwlib_id ();
+  sprintf (buffer, "scrollbar_%d", SCROLLBAR_X_ID (instance));
+  SCROLLBAR_X_NAME (instance) = xstrdup (buffer);
+#if defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_LUCID) || \
+    defined (LWLIB_SCROLLBARS_ATHENA3D)
+  SCROLLBAR_X_VDRAG_ORIG_VALUE (instance) = -1;
+#endif
+
+  if (vertical)
+    {
+      SCROLLBAR_X_WIDGET (instance) =
+	lw_create_widget ("vertical-scrollbar", SCROLLBAR_X_NAME (instance),
+			  SCROLLBAR_X_ID (instance),
+			  NULL, FRAME_X_CONTAINER_WIDGET (f), 0,
+			  x_update_vertical_scrollbar_callback, NULL, NULL);
+    }
+  else
+    {
+      SCROLLBAR_X_WIDGET (instance) =
+	lw_create_widget ("horizontal-scrollbar", SCROLLBAR_X_NAME (instance),
+			  SCROLLBAR_X_ID (instance),
+			  NULL, FRAME_X_CONTAINER_WIDGET (f), 0,
+			  x_update_horizontal_scrollbar_callback, NULL, NULL);
+    }
+}
+
+#define UPDATE_DATA_FIELD(field)				\
+  if (new_##field >= 0 &&					\
+      SCROLLBAR_X_POS_DATA (inst).field != new_##field) {	\
+    SCROLLBAR_X_POS_DATA (inst).field = new_##field;		\
+    inst->scrollbar_instance_changed = 1;			\
+  }
+
+/* A device method. */
+/* #### The -1 check is such a hack. */
+static void
+x_update_scrollbar_instance_values (struct window *w,
+				    struct scrollbar_instance *inst,
+				    int new_line_increment,
+				    int new_page_increment,
+				    int new_minimum, int new_maximum,
+				    int new_slider_size,
+				    int new_slider_position,
+				    int new_scrollbar_width,
+				    int new_scrollbar_height,
+				    int new_scrollbar_x, int new_scrollbar_y)
+{
+  UPDATE_DATA_FIELD (line_increment);
+  UPDATE_DATA_FIELD (page_increment);
+  UPDATE_DATA_FIELD (minimum);
+  UPDATE_DATA_FIELD (maximum);
+  UPDATE_DATA_FIELD (slider_size);
+  UPDATE_DATA_FIELD (slider_position);
+  UPDATE_DATA_FIELD (scrollbar_width);
+  UPDATE_DATA_FIELD (scrollbar_height);
+  UPDATE_DATA_FIELD (scrollbar_x);
+  UPDATE_DATA_FIELD (scrollbar_y);
+
+  /* This doesn't work with Athena, why? */
+#if defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_LUCID)
+  if (w && !vertical_drag_in_progress)
+    {
+      int new_vov = SCROLLBAR_X_POS_DATA (inst).slider_position;
+      int new_vows = marker_position (w->start[CURRENT_DISP]);
+
+      if (SCROLLBAR_X_VDRAG_ORIG_VALUE (inst) != new_vov)
+	{
+	  SCROLLBAR_X_VDRAG_ORIG_VALUE (inst) = new_vov;
+	  inst->scrollbar_instance_changed = 1;
+	}
+      if (SCROLLBAR_X_VDRAG_ORIG_WINDOW_START (inst) != new_vows)
+	{
+	  SCROLLBAR_X_VDRAG_ORIG_WINDOW_START (inst) = new_vows;
+	  inst->scrollbar_instance_changed = 1;
+	}
+    }
+#endif
+}
+
+/* Used by x_update_scrollbar_instance_status. */
+static void
+update_one_scrollbar_bs (struct frame *f, Widget sb_widget)
+{
+  Boolean use_backing_store;
+
+  Xt_GET_VALUE (FRAME_X_TEXT_WIDGET (f), XtNuseBackingStore, &use_backing_store);
+
+  if (use_backing_store && sb_widget)
+    {
+      unsigned long mask = CWBackingStore;
+      XSetWindowAttributes attrs;
+
+      attrs.backing_store = Always;
+      XChangeWindowAttributes (XtDisplay (sb_widget),
+			       XtWindow (sb_widget),
+			       mask,
+			       &attrs);
+    }
+}
+
+/* Create a widget value structure for passing down to lwlib so that
+   it can update the scrollbar widgets.  Used by
+   x_update_scrollbar_instance_status. */
+static widget_value *
+scrollbar_instance_to_widget_value (struct scrollbar_instance *instance)
+{
+  widget_value *wv;
+
+  wv = xmalloc_widget_value ();
+  /* #### maybe should add malloc_scrollbar_values to resource these? */
+  wv->scrollbar_data = xnew (scrollbar_values);
+
+  wv->name = SCROLLBAR_X_NAME (instance);
+  wv->value = 0;
+  wv->key = 0;
+  wv->enabled = instance->scrollbar_is_active;
+  wv->selected = 0;
+  wv->call_data = NULL;
+
+  *wv->scrollbar_data = SCROLLBAR_X_POS_DATA (instance);
+
+  wv->next = NULL;
+
+  return wv;
+}
+
+/* Used by x_update_scrollbar_instance_status. */
+static void
+update_one_widget_scrollbar_pointer (struct window *w, Widget wid)
+{
+  if (POINTER_IMAGE_INSTANCEP (w->scrollbar_pointer))
+    {
+      XDefineCursor (XtDisplay (wid), XtWindow (wid),
+		     XIMAGE_INSTANCE_X_CURSOR (w->scrollbar_pointer));
+      XSync (XtDisplay (wid), False);
+    }
+}
+
+/* A device method. */
+static void
+x_update_scrollbar_instance_status (struct window *w, int active, int size,
+				    struct scrollbar_instance *instance)
+{
+  struct frame *f = XFRAME (w->frame);
+  Boolean managed = XtIsManaged (SCROLLBAR_X_WIDGET (instance));
+
+  if (active && size)
+    {
+      widget_value *wv = scrollbar_instance_to_widget_value (instance);
+
+      if (instance->scrollbar_instance_changed)
+	{
+	  lw_modify_all_widgets (SCROLLBAR_X_ID (instance), wv, 0);
+	  instance->scrollbar_instance_changed = 0;
+	}
+
+      if (!managed)
+	{
+	  XtManageChild (SCROLLBAR_X_WIDGET (instance));
+	  if (XtWindow (SCROLLBAR_X_WIDGET (instance)))
+	    {
+	      /* Raise this window so that it's visible on top of the
+                 text window below it. */
+	      XRaiseWindow (XtDisplay (SCROLLBAR_X_WIDGET (instance)),
+			    XtWindow (SCROLLBAR_X_WIDGET (instance)));
+	      update_one_widget_scrollbar_pointer
+		(w, SCROLLBAR_X_WIDGET (instance));
+	      if (!SCROLLBAR_X_BACKING_STORE_INITIALIZED (instance))
+		{
+		  update_one_scrollbar_bs (f, SCROLLBAR_X_WIDGET (instance));
+		  SCROLLBAR_X_BACKING_STORE_INITIALIZED (instance) = 1;
+		}
+	    }
+	}
+
+      if (!wv->scrollbar_data) abort ();
+      xfree (wv->scrollbar_data);
+      wv->scrollbar_data = 0;
+      free_widget_value (wv);
+    }
+  else if (managed)
+    {
+#if defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_LUCID)
+      /* This isn't needed with Athena Scrollbars.  It might not be needed */
+      /* with Motif scrollbars (it is apparently needed with Lesstif). */
+      XtUngrabKeyboard (SCROLLBAR_X_WIDGET (instance), CurrentTime);
+#endif
+      XtUnmanageChild (SCROLLBAR_X_WIDGET (instance));
+    }
+}
+
+enum x_scrollbar_loop
+{
+  X_FIND_SCROLLBAR_WINDOW_MIRROR,
+  X_SET_SCROLLBAR_POINTER,
+  X_WINDOW_IS_SCROLLBAR,
+  X_UPDATE_FRAME_SCROLLBARS
+};
+
+static struct window_mirror *
+x_scrollbar_loop (enum x_scrollbar_loop type, Lisp_Object window,
+		  struct window_mirror *mir,
+		  LWLIB_ID id, Window x_win)
+{
+  struct window_mirror *retval = NULL;
+
+  while (mir)
+    {
+      struct scrollbar_instance *vinstance = mir->scrollbar_vertical_instance;
+      struct scrollbar_instance *hinstance = mir->scrollbar_horizontal_instance;
+      struct window *w = XWINDOW (window);
+
+      if (mir->vchild)
+	retval = x_scrollbar_loop (type, w->vchild, mir->vchild, id, x_win);
+      else if (mir->hchild)
+	retval = x_scrollbar_loop (type, w->hchild, mir->hchild, id, x_win);
+      if (retval)
+	return retval;
+
+      if (hinstance || vinstance)
+	{
+	  switch (type)
+	    {
+	    case X_FIND_SCROLLBAR_WINDOW_MIRROR:
+	      if ((vinstance && SCROLLBAR_X_ID (vinstance) == id) ||
+		  (hinstance && SCROLLBAR_X_ID (hinstance) == id))
+		return mir;
+	      break;
+	    case X_UPDATE_FRAME_SCROLLBARS:
+	      if (!mir->vchild && !mir->hchild)
+		update_window_scrollbars (w, mir, 1, 0);
+	      break;
+	    case X_SET_SCROLLBAR_POINTER:
+	      if (!mir->vchild && !mir->hchild)
+		{
+                  Widget widget;
+
+		  widget = SCROLLBAR_X_WIDGET (hinstance);
+		  if (widget && XtIsManaged (widget))
+		    update_one_widget_scrollbar_pointer (w, widget);
+
+		  widget = SCROLLBAR_X_WIDGET (vinstance);
+		  if (widget && XtIsManaged (widget))
+		    update_one_widget_scrollbar_pointer (w, widget);
+		}
+	      break;
+	    case X_WINDOW_IS_SCROLLBAR:
+	      if (!mir->vchild && !mir->hchild)
+		{
+		  Widget widget;
+
+		  widget = SCROLLBAR_X_WIDGET (hinstance);
+		  if (widget && XtIsManaged (widget) &&
+		      XtWindow (widget) == x_win)
+		    return (struct window_mirror *) 1;
+
+		  widget = SCROLLBAR_X_WIDGET (vinstance);
+		  if (widget && XtIsManaged (widget) &&
+		      XtWindow (widget) == x_win)
+		    return (struct window_mirror *) 1;
+		}
+	      break;
+	    default:
+	      abort ();
+	    }
+	}
+
+      mir = mir->next;
+      window = w->next;
+    }
+
+  return NULL;
+}
+
+/* Used by callbacks. */
+static struct window_mirror *
+find_scrollbar_window_mirror (struct frame *f, LWLIB_ID id)
+{
+  if (f->mirror_dirty)
+    update_frame_window_mirror (f);
+  return x_scrollbar_loop (X_FIND_SCROLLBAR_WINDOW_MIRROR, f->root_window,
+			   f->root_mirror, id, (Window) NULL);
+}
+
+/*
+ * This is the only callback provided for vertical scrollbars.  It
+ * should be able to handle all of the scrollbar events in
+ * scroll_action (see lwlib.h).  The client data will be of type
+ * scroll_event (see lwlib.h). */
+static void
+x_update_vertical_scrollbar_callback (Widget widget, LWLIB_ID id,
+				      XtPointer client_data)
+{
+  /* This function can GC */
+  scroll_event *data = (scroll_event *) client_data;
+  struct device *d = get_device_from_display (XtDisplay (widget));
+  struct frame *f = x_any_window_to_frame (d, XtWindow (widget));
+  Lisp_Object win, frame;
+  struct scrollbar_instance *instance;
+  struct window_mirror *mirror;
+
+  if (!f)
+    return;
+
+  mirror = find_scrollbar_window_mirror (f, id);
+  win = real_window (mirror, 1);
+
+  if (NILP (win))
+    return;
+  instance = mirror->scrollbar_vertical_instance;
+  frame = WINDOW_FRAME (XWINDOW (win));
+
+  /* It seems that this is necessary whenever signal_special_Xt_user_event()
+     is called.  #### Why??? */
+  DEVICE_X_MOUSE_TIMESTAMP (d) = DEVICE_X_GLOBAL_MOUSE_TIMESTAMP (d);
+
+  switch (data->action)
+    {
+    case SCROLLBAR_LINE_UP:
+      signal_special_Xt_user_event (frame, Qscrollbar_line_up, win);
+      break;
+
+    case SCROLLBAR_LINE_DOWN:
+      signal_special_Xt_user_event (frame, Qscrollbar_line_down, win);
+      break;
+
+      /* The Athena scrollbar paging behavior is that of xterms.
+         Depending on where you click the size of the page varies.
+         Motif always does a standard Emacs page. */
+    case SCROLLBAR_PAGE_UP:
+#if !defined (LWLIB_SCROLLBARS_MOTIF) && !defined (LWLIB_SCROLLBARS_LUCID) && \
+    !defined (LWLIB_SCROLLBARS_ATHENA3D)
+      {
+	double tmp = ((double) data->slider_value /
+		      (double) SCROLLBAR_X_POS_DATA(instance).scrollbar_height);
+	double line = tmp *
+	  (double) window_displayed_height (XWINDOW (win));
+
+	if (line > -1.0)
+	  line = -1.0;
+	signal_special_Xt_user_event (frame, Qscrollbar_page_up,
+				      Fcons (win, make_int ((int) line)));
+      }
+#else
+      signal_special_Xt_user_event (frame, Qscrollbar_page_up,
+				    Fcons (win, Qnil));
+#endif
+      break;
+
+    case SCROLLBAR_PAGE_DOWN:
+#if !defined (LWLIB_SCROLLBARS_MOTIF) && !defined (LWLIB_SCROLLBARS_LUCID) && \
+    !defined (LWLIB_SCROLLBARS_ATHENA3D)
+      {
+	double tmp = ((double) data->slider_value /
+		      (double) SCROLLBAR_X_POS_DATA(instance).scrollbar_height);
+	double line = tmp *
+	  (double) window_displayed_height (XWINDOW (win));
+
+	if (SCROLLBAR_X_POS_DATA(instance).maximum >
+	    (SCROLLBAR_X_POS_DATA(instance).slider_size + SCROLLBAR_X_POS_DATA(instance).slider_position))
+	  {
+	    if (line < 1.0)
+	      line = 1.0;
+	    signal_special_Xt_user_event (frame, Qscrollbar_page_down,
+					  Fcons (win,
+						 make_int ((int) line)));
+	  }
+      }
+#else
+      signal_special_Xt_user_event (frame, Qscrollbar_page_down,
+				    Fcons (win, Qnil));
+#endif
+      break;
+
+    case SCROLLBAR_TOP:
+      signal_special_Xt_user_event (frame, Qscrollbar_to_top, win);
+      break;
+
+    case SCROLLBAR_BOTTOM:
+      signal_special_Xt_user_event (frame, Qscrollbar_to_bottom, win);
+      break;
+
+
+    case SCROLLBAR_CHANGE:
+      inhibit_slider_size_change = 0;
+#if defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_LUCID)
+      vertical_drag_in_progress = 0;
+      SCROLLBAR_X_VDRAG_ORIG_VALUE (instance) = data->slider_value;
+      SCROLLBAR_X_VDRAG_ORIG_WINDOW_START (instance) =
+	XINT (Fwindow_start (win));
+#else
+      stupid_vertical_scrollbar_drag_hack = 0;
+#endif
+      break;
+
+    case SCROLLBAR_DRAG:
+      {
+	int value;
+
+	inhibit_slider_size_change = 1;
+
+#if defined (LWLIB_SCROLLBARS_MOTIF) || defined (LWLIB_SCROLLBARS_LUCID)
+	/* Doing drags with Motif-like scrollbars is a mess, since we
+	   want to avoid having the window position jump when you
+	   first grab the scrollbar, but we also want to ensure that
+	   you can scroll all the way to the top or bottom of the
+	   buffer.  This can all be replaced with something sane when
+	   we get line-based scrolling. */
+
+	vertical_drag_in_progress = 1;
+
+	if (SCROLLBAR_X_VDRAG_ORIG_VALUE (instance) < 0)
+	  {
+	    SCROLLBAR_X_VDRAG_ORIG_VALUE (instance) = data->slider_value;
+	    SCROLLBAR_X_VDRAG_ORIG_WINDOW_START (instance) =
+	      XINT (Fwindow_start (win));
+	  }
+
+	/* Could replace this piecewise linear scrolling with a
+	   quadratic through the three points, but I'm not sure that
+	   would feel any nicer in practice. */
+	if (data->slider_value < SCROLLBAR_X_VDRAG_ORIG_VALUE (instance))
+	  {
+	    /* We've dragged up; slide linearly from original position to
+	       window-start=data.minimum, slider-value=data.minimum. */
+
+	    if (SCROLLBAR_X_VDRAG_ORIG_VALUE (instance)
+		<= SCROLLBAR_X_POS_DATA (instance).minimum)
+	      {
+		/* shouldn't get here, but just in case */
+		value = SCROLLBAR_X_POS_DATA (instance).minimum;
+	      }
+	    else
+	      {
+		value = (int)
+		  (SCROLLBAR_X_POS_DATA (instance).minimum
+		   + (((double)
+		       (SCROLLBAR_X_VDRAG_ORIG_WINDOW_START (instance)
+			- SCROLLBAR_X_POS_DATA (instance).minimum)
+		       * (data->slider_value -
+			  SCROLLBAR_X_POS_DATA (instance).minimum))
+		      / (SCROLLBAR_X_VDRAG_ORIG_VALUE (instance)
+			 - SCROLLBAR_X_POS_DATA (instance).minimum)));
+	      }
+	  }
+	else
+	  {
+	    /* We've dragged down; slide linearly from original position to
+	       window-start=data.maximum, slider-value=data.maximum. */
+
+	    if (SCROLLBAR_X_VDRAG_ORIG_VALUE (instance)
+		>= (SCROLLBAR_X_POS_DATA (instance).maximum -
+		    SCROLLBAR_X_POS_DATA (instance).slider_size))
+	      {
+		/* avoid divide by zero */
+		value = SCROLLBAR_X_VDRAG_ORIG_WINDOW_START (instance);
+	      }
+	    else
+	      {
+		value = (int)
+		  (SCROLLBAR_X_VDRAG_ORIG_WINDOW_START (instance)
+		   + (((double)
+		       (SCROLLBAR_X_POS_DATA (instance).maximum
+			- SCROLLBAR_X_VDRAG_ORIG_WINDOW_START (instance))
+		       * (data->slider_value
+			  - SCROLLBAR_X_VDRAG_ORIG_VALUE (instance)))
+		      / (SCROLLBAR_X_POS_DATA (instance).maximum
+			 - SCROLLBAR_X_POS_DATA (instance).slider_size
+			 - SCROLLBAR_X_VDRAG_ORIG_VALUE (instance))));
+	      }
+	  }
+#else
+	stupid_vertical_scrollbar_drag_hack = 0;
+	value = data->slider_value;
+#endif
+
+	if (value >= SCROLLBAR_X_POS_DATA (instance).maximum)
+	  value = SCROLLBAR_X_POS_DATA (instance).maximum - 1;
+	if (value < SCROLLBAR_X_POS_DATA (instance).minimum)
+	  value = SCROLLBAR_X_POS_DATA (instance).minimum;
+
+	signal_special_Xt_user_event (frame, Qscrollbar_vertical_drag,
+				      Fcons (win, make_int (value)));
+      }
+      break;
+
+    }
+}
+
+/*
+ * This is the only callback provided for horizontal scrollbars.  It
+ * should be able to handle all of the scrollbar events in
+ * scroll_action (see lwlib.h).  The client data will be of type
+ * scroll_event (see lwlib.h). */
+static void
+x_update_horizontal_scrollbar_callback (Widget widget, LWLIB_ID id,
+					XtPointer client_data)
+{
+  scroll_event *data = (scroll_event *) client_data;
+  struct device *d = get_device_from_display (XtDisplay (widget));
+  struct frame *f = x_any_window_to_frame (d, XtWindow (widget));
+  Lisp_Object win, frame;
+  struct window_mirror *mirror;
+
+  if (!f)
+    return;
+
+  mirror = find_scrollbar_window_mirror (f, id);
+  win = real_window (mirror, 1);
+
+  if (NILP (win))
+    return;
+  frame = WINDOW_FRAME (XWINDOW (win));
+
+  /* It seems that this is necessary whenever signal_special_Xt_user_event()
+     is called.  #### Why??? */
+  DEVICE_X_MOUSE_TIMESTAMP (d) = DEVICE_X_GLOBAL_MOUSE_TIMESTAMP (d);
+
+  switch (data->action)
+    {
+    case SCROLLBAR_LINE_UP:
+      signal_special_Xt_user_event (frame, Qscrollbar_char_left, win);
+      break;
+    case SCROLLBAR_LINE_DOWN:
+      signal_special_Xt_user_event (frame, Qscrollbar_char_right, win);
+      break;
+    case SCROLLBAR_PAGE_UP:
+      signal_special_Xt_user_event (frame, Qscrollbar_page_left, win);
+      break;
+    case SCROLLBAR_PAGE_DOWN:
+      signal_special_Xt_user_event (frame, Qscrollbar_page_right, win);
+      break;
+    case SCROLLBAR_TOP:
+      signal_special_Xt_user_event (frame, Qscrollbar_to_left, win);
+      break;
+    case SCROLLBAR_BOTTOM:
+      signal_special_Xt_user_event (frame, Qscrollbar_to_right, win);
+      break;
+    case SCROLLBAR_CHANGE:
+      inhibit_slider_size_change = 0;
+      break;
+    case SCROLLBAR_DRAG:
+      inhibit_slider_size_change = 1;
+      /* #### Fix the damn toolkit code so they all work the same way.
+         Lucid is the one mostly wrong.*/
+#if defined (LWLIB_SCROLLBARS_LUCID) || defined (LWLIB_SCROLLBARS_ATHENA3D)
+      signal_special_Xt_user_event (frame, Qscrollbar_horizontal_drag,
+				    (Fcons
+				     (win, make_int (data->slider_value))));
+#else
+      signal_special_Xt_user_event (frame, Qscrollbar_horizontal_drag,
+				    (Fcons
+				     (win,
+				      make_int (data->slider_value - 1))));
+#endif
+      break;
+    default:
+      break;
+    }
+}
+
+static void
+x_scrollbar_pointer_changed_in_window (struct window *w)
+{
+  Lisp_Object window;
+
+  XSETWINDOW (window, w);
+  x_scrollbar_loop (X_SET_SCROLLBAR_POINTER, window, find_window_mirror (w),
+		    0, (Window) NULL);
+}
+
+/* Make sure that all scrollbars on frame are up-to-date.  Called
+   directly from x_set_frame_properties in frame-x.c*/
+void
+x_update_frame_scrollbars (struct frame *f)
+{
+  /* Consider this code to be "in_display" so that we abort() if Fsignal()
+     gets called. */
+  in_display++;
+  x_scrollbar_loop (X_UPDATE_FRAME_SCROLLBARS, f->root_window, f->root_mirror,
+		    0, (Window) NULL);
+  in_display--;
+  if (in_display < 0) abort ();
+}
+
+#ifdef MEMORY_USAGE_STATS
+
+static int
+x_compute_scrollbar_instance_usage (struct device *d,
+				    struct scrollbar_instance *inst,
+				    struct overhead_stats *ovstats)
+{
+  int total = 0;
+
+  while (inst)
+    {
+      struct x_scrollbar_data *data =
+	(struct x_scrollbar_data *) inst->scrollbar_data;
+
+      total += malloced_storage_size (data, sizeof (*data), ovstats);
+      total += malloced_storage_size (data->name, 1 + strlen (data->name),
+				      ovstats);
+      inst = inst->next;
+    }
+
+  return total;
+}
+
+#endif /* MEMORY_USAGE_STATS */
+
+
+/************************************************************************/
+/*                            initialization                            */
+/************************************************************************/
+
+void
+console_type_create_scrollbar_x (void)
+{
+  CONSOLE_HAS_METHOD (x, inhibit_scrollbar_slider_size_change);
+  CONSOLE_HAS_METHOD (x, free_scrollbar_instance);
+  CONSOLE_HAS_METHOD (x, release_scrollbar_instance);
+  CONSOLE_HAS_METHOD (x, create_scrollbar_instance);
+  CONSOLE_HAS_METHOD (x, update_scrollbar_instance_values);
+  CONSOLE_HAS_METHOD (x, update_scrollbar_instance_status);
+  CONSOLE_HAS_METHOD (x, scrollbar_pointer_changed_in_window);
+#ifdef MEMORY_USAGE_STATS
+  CONSOLE_HAS_METHOD (x, compute_scrollbar_instance_usage);
+#endif /* MEMORY_USAGE_STATS */
+}
+
+void
+reinit_vars_of_scrollbar_x (void)
+{
+  stupid_vertical_scrollbar_drag_hack = 1;
+}
+
+void
+vars_of_scrollbar_x (void)
+{
+  reinit_vars_of_scrollbar_x ();
+
+#if defined (LWLIB_SCROLLBARS_LUCID)
+  Fprovide (intern ("lucid-scrollbars"));
+#elif defined (LWLIB_SCROLLBARS_MOTIF)
+  Fprovide (intern ("motif-scrollbars"));
+#elif defined (LWLIB_SCROLLBARS_ATHENA)
+  Fprovide (intern ("athena-scrollbars"));
+#endif
+}