--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/scrollbar-gtk.c	Mon Aug 13 11:44:37 2007 +0200
@@ -0,0 +1,481 @@
+/* scrollbar implementation -- X interface.
+   Copyright (C) 1994, 1995 Board of Trustees, University of Illinois.
+   Copyright (C) 1994 Amdhal 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. */
+/* Gtk version by William M. Perry */
+
+#include <config.h>
+#include "lisp.h"
+
+#include "console-gtk.h"
+#include "glyphs-gtk.h"
+#include "gui-gtk.h"
+#include "scrollbar-gtk.h"
+
+#include "frame.h"
+#include "window.h"
+
+static gboolean scrollbar_cb (GtkAdjustment *adj, gpointer user_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;
+
+static int vertical_drag_in_progress;
+
+
+/* A device method. */
+static int
+gtk_inhibit_scrollbar_slider_size_change (void)
+{
+  return inhibit_slider_size_change;
+}
+
+/* A device method. */
+static void
+gtk_free_scrollbar_instance (struct scrollbar_instance *instance)
+{
+  if (SCROLLBAR_GTK_WIDGET (instance))
+    {
+      gtk_widget_hide_all (SCROLLBAR_GTK_WIDGET (instance));
+      gtk_widget_destroy (SCROLLBAR_GTK_WIDGET (instance));
+    }
+
+  if (instance->scrollbar_data)
+    xfree (instance->scrollbar_data);
+}
+
+/* A device method. */
+static void
+gtk_release_scrollbar_instance (struct scrollbar_instance *instance)
+{
+    /* It won't hurt to hide it all the time, will it? */
+    gtk_widget_hide_all (SCROLLBAR_GTK_WIDGET (instance));
+}
+
+static gboolean
+scrollbar_drag_hack_cb (GtkWidget *w, GdkEventButton *ev, gpointer v)
+{
+  vertical_drag_in_progress = (int) v;
+  inhibit_slider_size_change = (int) v;
+  return (FALSE);
+}
+
+/* A device method. */
+static void
+gtk_create_scrollbar_instance (struct frame *f, int vertical,
+			       struct scrollbar_instance *instance)
+{
+  GtkAdjustment *adj = GTK_ADJUSTMENT (gtk_adjustment_new (0,0,0,0,0,0));
+  GtkScrollbar *sb = NULL;
+
+  /* initialize the X specific data section. */
+  instance->scrollbar_data = xnew_and_zero (struct gtk_scrollbar_data);
+
+  SCROLLBAR_GTK_ID (instance) = new_gui_id ();
+  SCROLLBAR_GTK_VDRAG_ORIG_VALUE (instance) = -1;
+  SCROLLBAR_GTK_LAST_VALUE (instance) = adj->value;
+
+  gtk_object_set_data (GTK_OBJECT (adj), "xemacs::gui_id", (void *) SCROLLBAR_GTK_ID (instance));
+  gtk_object_set_data (GTK_OBJECT (adj), "xemacs::frame", f);
+  gtk_object_set_data (GTK_OBJECT (adj), "xemacs::sb_instance", instance);
+
+  sb = GTK_SCROLLBAR (vertical ? gtk_vscrollbar_new (adj) : gtk_hscrollbar_new (adj));
+  SCROLLBAR_GTK_WIDGET (instance) = GTK_WIDGET (sb);
+
+  gtk_signal_connect (GTK_OBJECT (adj),"value-changed",
+		      GTK_SIGNAL_FUNC (scrollbar_cb), (gpointer) vertical);
+
+  gtk_signal_connect (GTK_OBJECT (sb), "button-press-event",
+		      GTK_SIGNAL_FUNC (scrollbar_drag_hack_cb), (gpointer) 1);
+  gtk_signal_connect (GTK_OBJECT (sb), "button-release-event",
+		      GTK_SIGNAL_FUNC (scrollbar_drag_hack_cb), (gpointer) 0);
+
+  gtk_fixed_put (GTK_FIXED (FRAME_GTK_TEXT_WIDGET (f)), SCROLLBAR_GTK_WIDGET (instance), 0, 0);
+  gtk_widget_hide (SCROLLBAR_GTK_WIDGET (instance));
+}
+
+#define UPDATE_DATA_FIELD(field)				\
+  if (new_##field >= 0 &&					\
+      SCROLLBAR_GTK_POS_DATA (inst).field != new_##field) {	\
+    SCROLLBAR_GTK_POS_DATA (inst).field = new_##field;		\
+    inst->scrollbar_instance_changed = 1;			\
+  }
+
+/* A device method. */
+/* #### The -1 check is such a hack. */
+static void
+gtk_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);
+
+  if (w && !vertical_drag_in_progress)
+    {
+      int new_vov = SCROLLBAR_GTK_POS_DATA (inst).slider_position;
+      int new_vows = marker_position (w->start[CURRENT_DISP]);
+
+      if (SCROLLBAR_GTK_VDRAG_ORIG_VALUE (inst) != new_vov)
+	{
+	  SCROLLBAR_GTK_VDRAG_ORIG_VALUE (inst) = new_vov;
+	  inst->scrollbar_instance_changed = 1;
+	}
+      if (SCROLLBAR_GTK_VDRAG_ORIG_WINDOW_START (inst) != new_vows)
+	{
+	  SCROLLBAR_GTK_VDRAG_ORIG_WINDOW_START (inst) = new_vows;
+	  inst->scrollbar_instance_changed = 1;
+	}
+    }
+}
+
+/* Used by gtk_update_scrollbar_instance_status. */
+static void
+update_one_widget_scrollbar_pointer (struct window *w, GtkWidget *wid)
+{
+  if (!wid->window)
+    gtk_widget_realize (wid);
+
+  if (POINTER_IMAGE_INSTANCEP (w->scrollbar_pointer))
+    {
+      gdk_window_set_cursor (GET_GTK_WIDGET_WINDOW (wid),
+			     XIMAGE_INSTANCE_GTK_CURSOR (w->scrollbar_pointer));
+      gdk_flush ();
+    }
+}
+
+/* A device method. */
+static void
+gtk_update_scrollbar_instance_status (struct window *w, int active, int size,
+				      struct scrollbar_instance *instance)
+{
+  struct frame *f = XFRAME (w->frame);
+  GtkWidget *wid = SCROLLBAR_GTK_WIDGET (instance);
+  gboolean managed = GTK_WIDGET_MAPPED (wid);
+
+  if (active && size)
+    {
+      if (instance->scrollbar_instance_changed)
+	{
+	  /* Need to set the height, width, and position of the widget */
+	  GtkAdjustment *adj = gtk_range_get_adjustment (GTK_RANGE (wid));
+	  scrollbar_values *pos_data = & SCROLLBAR_GTK_POS_DATA (instance);
+	  int modified_p = 0;
+
+	  /* We do not want to update the size all the time if we can
+             help it.  This cuts down on annoying flicker.
+	  */
+	  if ((wid->allocation.width != pos_data->scrollbar_width) ||
+	      (wid->allocation.height != pos_data->scrollbar_height))
+	    {
+	      gtk_widget_set_usize (wid,
+				    pos_data->scrollbar_width,
+				    pos_data->scrollbar_height);
+	      modified_p = 1;
+	    }
+
+	  /* Ditto for the x/y position. */
+	  if ((wid->allocation.x != pos_data->scrollbar_x) ||
+	      (wid->allocation.y != pos_data->scrollbar_y))
+	    {
+	      gtk_fixed_move (GTK_FIXED (FRAME_GTK_TEXT_WIDGET (f)),
+			      wid,
+			      pos_data->scrollbar_x,
+			      pos_data->scrollbar_y);
+	      modified_p = 1;
+	    }
+
+	  adj->lower = pos_data->minimum;
+	  adj->upper = pos_data->maximum;
+	  adj->page_increment = pos_data->slider_size + 1;
+	  adj->step_increment = w->max_line_len - 1;
+	  adj->page_size = pos_data->slider_size + 1;
+	  adj->value = pos_data->slider_position;
+
+	  /* But, if we didn't resize or move the scrollbar, the
+             widget will not get redrawn correctly when the user
+             scrolls around in the XEmacs frame manually.  So we
+             update the slider manually here.
+	  */
+	  if (!modified_p)
+	    gtk_range_slider_update (GTK_RANGE (wid));
+
+	  instance->scrollbar_instance_changed = 0;
+	}
+
+      if (!managed)
+	{
+	  gtk_widget_show (wid);
+	  update_one_widget_scrollbar_pointer (w, wid);
+	}
+    }
+  else if (managed)
+    {
+      gtk_widget_hide (wid);
+    }
+}
+
+enum gtk_scrollbar_loop
+{
+  GTK_FIND_SCROLLBAR_WINDOW_MIRROR,
+  GTK_SET_SCROLLBAR_POINTER,
+  GTK_WINDOW_IS_SCROLLBAR,
+  GTK_UPDATE_FRAME_SCROLLBARS
+};
+
+static struct window_mirror *
+gtk_scrollbar_loop (enum gtk_scrollbar_loop type, Lisp_Object window,
+		    struct window_mirror *mir,
+		    GUI_ID id, GdkWindow *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 = gtk_scrollbar_loop (type, w->vchild, mir->vchild, id, x_win);
+      else if (mir->hchild)
+	retval = gtk_scrollbar_loop (type, w->hchild, mir->hchild, id, x_win);
+      if (retval)
+	return retval;
+
+      if (hinstance || vinstance)
+	{
+	  switch (type)
+	    {
+	    case GTK_FIND_SCROLLBAR_WINDOW_MIRROR:
+	      if ((vinstance && SCROLLBAR_GTK_ID (vinstance) == id) ||
+		  (hinstance && SCROLLBAR_GTK_ID (hinstance) == id))
+		return mir;
+	      break;
+	    case GTK_UPDATE_FRAME_SCROLLBARS:
+	      if (!mir->vchild && !mir->hchild)
+		update_window_scrollbars (w, mir, 1, 0);
+	      break;
+	    case GTK_SET_SCROLLBAR_POINTER:
+	      if (!mir->vchild && !mir->hchild)
+		{
+                  GtkWidget *widget;
+
+		  widget = SCROLLBAR_GTK_WIDGET (hinstance);
+		  if (widget && GTK_WIDGET_MAPPED (widget))
+		    update_one_widget_scrollbar_pointer (w, widget);
+
+		  widget = SCROLLBAR_GTK_WIDGET (vinstance);
+		  if (widget && GTK_WIDGET_MAPPED (widget))
+		    update_one_widget_scrollbar_pointer (w, widget);
+		}
+	      break;
+	    case GTK_WINDOW_IS_SCROLLBAR:
+	      if (!mir->vchild && !mir->hchild)
+		{
+		  GtkWidget *widget;
+
+		  widget = SCROLLBAR_GTK_WIDGET (hinstance);
+		  if (widget && GTK_WIDGET_MAPPED (widget) &&
+		      GET_GTK_WIDGET_WINDOW (widget) == x_win)
+		    return (struct window_mirror *) 1;
+
+		  widget = SCROLLBAR_GTK_WIDGET (vinstance);
+		  if (widget && GTK_WIDGET_MAPPED (widget) &&
+		      GET_GTK_WIDGET_WINDOW (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, GUI_ID id)
+{
+  if (f->mirror_dirty)
+    update_frame_window_mirror (f);
+  return gtk_scrollbar_loop (GTK_FIND_SCROLLBAR_WINDOW_MIRROR, f->root_window,
+			     f->root_mirror, id, (GdkWindow *) NULL);
+}
+
+static gboolean
+scrollbar_cb (GtkAdjustment *adj, gpointer user_data)
+{
+  /* This function can GC */
+  int vertical = (int) user_data;
+  struct frame *f = gtk_object_get_data (GTK_OBJECT (adj), "xemacs::frame");
+  struct scrollbar_instance *instance = gtk_object_get_data (GTK_OBJECT (adj), "xemacs::sb_instance");
+  GUI_ID id = (GUI_ID) gtk_object_get_data (GTK_OBJECT (adj), "xemacs::gui_id");
+  Lisp_Object win, frame;
+  struct window_mirror *mirror;
+  Lisp_Object event_type = Qnil;
+  Lisp_Object event_data = Qnil;
+
+  if (!f)
+    return(FALSE);
+
+  mirror = find_scrollbar_window_mirror (f, id);
+  if (!mirror)
+    return(FALSE);
+  
+  win = real_window (mirror, 1);
+
+  if (NILP (win))
+    return(FALSE);
+  instance = vertical ? mirror->scrollbar_vertical_instance : mirror->scrollbar_horizontal_instance;
+  frame = WINDOW_FRAME (XWINDOW (win));
+
+  inhibit_slider_size_change = 0;
+  switch (GTK_RANGE (SCROLLBAR_GTK_WIDGET (instance))->scroll_type)
+    {
+    case GTK_SCROLL_PAGE_BACKWARD:
+      event_type = vertical ? Qscrollbar_page_up : Qscrollbar_page_left;
+      event_data = Fcons (win, Qnil);
+      break;
+    case GTK_SCROLL_PAGE_FORWARD:
+      event_type = vertical ? Qscrollbar_page_down : Qscrollbar_page_right;
+      event_data = Fcons (win, Qnil);
+      break;
+    case GTK_SCROLL_STEP_FORWARD:
+      event_type = vertical ? Qscrollbar_line_down : Qscrollbar_char_right;
+      event_data = win;
+      break;
+    case GTK_SCROLL_STEP_BACKWARD:
+      event_type = vertical ? Qscrollbar_line_up : Qscrollbar_char_left;
+      event_data = win;
+      break;
+    case GTK_SCROLL_NONE:
+    case GTK_SCROLL_JUMP:
+      inhibit_slider_size_change = 1;
+      event_type = vertical ? Qscrollbar_vertical_drag : Qscrollbar_horizontal_drag;
+      event_data = Fcons (win, make_int ((int)adj->value));
+      break;
+    default:
+      abort();
+    }
+
+  signal_special_gtk_user_event (frame, event_type, event_data);
+
+  return (TRUE);
+}
+
+static void
+gtk_scrollbar_pointer_changed_in_window (struct window *w)
+{
+  Lisp_Object window;
+
+  XSETWINDOW (window, w);
+  gtk_scrollbar_loop (GTK_SET_SCROLLBAR_POINTER, window, find_window_mirror (w),
+		      0, (GdkWindow *) NULL);
+}
+
+/* #### BILL!!! This comment is not true for Gtk - should it be? */
+/* Make sure that all scrollbars on frame are up-to-date.  Called
+   directly from gtk_set_frame_properties in frame-gtk.c*/
+void
+gtk_update_frame_scrollbars (struct frame *f)
+{
+  /* Consider this code to be "in_display" so that we abort() if Fsignal()
+     gets called. */
+  in_display++;
+  gtk_scrollbar_loop (GTK_UPDATE_FRAME_SCROLLBARS, f->root_window, f->root_mirror,
+		      0, (GdkWindow *) NULL);
+  in_display--;
+  if (in_display < 0) abort ();
+}
+
+#ifdef MEMORY_USAGE_STATS
+static int
+gtk_compute_scrollbar_instance_usage (struct device *d,
+				      struct scrollbar_instance *inst,
+				      struct overhead_stats *ovstats)
+{
+  int total = 0;
+
+  while (inst)
+    {
+      struct gtk_scrollbar_data *data =
+	(struct gtk_scrollbar_data *) inst->scrollbar_data;
+
+      total += malloced_storage_size (data, sizeof (*data), ovstats);
+      inst = inst->next;
+    }
+
+  return total;
+}
+
+#endif /* MEMORY_USAGE_STATS */
+
+
+/************************************************************************/
+/*                            initialization                            */
+/************************************************************************/
+
+void
+console_type_create_scrollbar_gtk (void)
+{
+  CONSOLE_HAS_METHOD (gtk, inhibit_scrollbar_slider_size_change);
+  CONSOLE_HAS_METHOD (gtk, free_scrollbar_instance);
+  CONSOLE_HAS_METHOD (gtk, release_scrollbar_instance);
+  CONSOLE_HAS_METHOD (gtk, create_scrollbar_instance);
+  CONSOLE_HAS_METHOD (gtk, update_scrollbar_instance_values);
+  CONSOLE_HAS_METHOD (gtk, update_scrollbar_instance_status);
+  CONSOLE_HAS_METHOD (gtk, scrollbar_pointer_changed_in_window);
+#ifdef MEMORY_USAGE_STATS
+  CONSOLE_HAS_METHOD (gtk, compute_scrollbar_instance_usage);
+#endif /* MEMORY_USAGE_STATS */
+}
+
+void
+vars_of_scrollbar_gtk (void)
+{
+  Fprovide (intern ("gtk-scrollbars"));
+}