/* testtreecolumns.c

 * Copyright (C) 2001 Red Hat, Inc

 * Author: Jonathan Blandford

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library 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

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public

 * License along with this library; if not, write to the

 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 */

#include "config.h"

#include <gtk/gtk.h>

/*

 * README README README README README README README README README README

 * README README README README README README README README README README

 * README README README README README README README README README README

 * README README README README README README README README README README

 * README README README README README README README README README README

 * README README README README README README README README README README

 * README README README README README README README README README README

 * README README README README README README README README README README

 * README README README README README README README README README README

 * README README README README README README README README README README

 * README README README README README README README README README README

 * README README README README README README README README README README

 * README README README README README README README README README README

 *

 * DO NOT!!! I REPEAT DO NOT!  EVER LOOK AT THIS CODE AS AN EXAMPLE OF WHAT YOUR

 * CODE SHOULD LOOK LIKE.

 *

 * IT IS VERY CONFUSING, AND IS MEANT TO TEST A LOT OF CODE IN THE TREE.  WHILE

 * IT IS ACTUALLY CORRECT CODE, IT IS NOT USEFUL.

 */

GtkWidget *left_tree_view;

GtkWidget *top_right_tree_view;

GtkWidget *bottom_right_tree_view;

GtkTreeModel *left_tree_model;

GtkTreeModel *top_right_tree_model;

GtkTreeModel *bottom_right_tree_model;

GtkWidget *sample_tree_view_top;

GtkWidget *sample_tree_view_bottom;

#define column_data "my_column_data"

static void move_row  (GtkTreeModel *src,

		       GtkTreeIter  *src_iter,

		       GtkTreeModel *dest,

		       GtkTreeIter  *dest_iter);

/* Kids, don't try this at home.  */

/* Small GtkTreeModel to model columns */

typedef struct _ViewColumnModel ViewColumnModel;

typedef struct _ViewColumnModelClass ViewColumnModelClass;

struct _ViewColumnModel

{

  GObject parent;

  GtkTreeView *view;

  GList *columns;

  gint stamp;

};

struct _ViewColumnModelClass

{

  GObjectClass parent_class;

};

static void view_column_model_init (ViewColumnModel *model)

{

  model->stamp = g_random_int ();

}

static gint

view_column_model_get_n_columns (GtkTreeModel *tree_model)

{

  return 2;

}

static GType

view_column_model_get_column_type (GtkTreeModel *tree_model,

				   gint          index)

{

  switch (index)

    {

    case 0:

      return G_TYPE_STRING;

    case 1:

      return GTK_TYPE_TREE_VIEW_COLUMN;

    default:

      return G_TYPE_INVALID;

    }

}

static gboolean

view_column_model_get_iter (GtkTreeModel *tree_model,

			    GtkTreeIter  *iter,

			    GtkTreePath  *path)

{

  ViewColumnModel *view_model = (ViewColumnModel *)tree_model;

  GList *list;

  gint i;

  g_return_val_if_fail (gtk_tree_path_get_depth (path) > 0, FALSE);

  i = gtk_tree_path_get_indices (path)[0];

  list = g_list_nth (view_model->columns, i);

  if (list == NULL)

    return FALSE;

  iter->stamp = view_model->stamp;

  iter->user_data = list;

  return TRUE;

}

static GtkTreePath *

view_column_model_get_path (GtkTreeModel *tree_model,

			    GtkTreeIter  *iter)

{

  ViewColumnModel *view_model = (ViewColumnModel *)tree_model;

  GtkTreePath *retval;

  GList *list;

  gint i = 0;

  g_return_val_if_fail (iter->stamp == view_model->stamp, NULL);

  for (list = view_model->columns; list; list = list->next)

    {

      if (list == (GList *)iter->user_data)

	break;

      i++;

    }

  if (list == NULL)

    return NULL;

  retval = gtk_tree_path_new ();

  gtk_tree_path_append_index (retval, i);

  return retval;

}

static void

view_column_model_get_value (GtkTreeModel *tree_model,

			     GtkTreeIter  *iter,

			     gint          column,

			     GValue       *value)

{

  ViewColumnModel *view_model = (ViewColumnModel *)tree_model;

  g_return_if_fail (column < 2);

  g_return_if_fail (view_model->stamp == iter->stamp);

  g_return_if_fail (iter->user_data != NULL);

  if (column == 0)

    {

      g_value_init (value, G_TYPE_STRING);

      g_value_set_string (value, gtk_tree_view_column_get_title (GTK_TREE_VIEW_COLUMN (((GList *)iter->user_data)->data)));

    }

  else

    {

      g_value_init (value, GTK_TYPE_TREE_VIEW_COLUMN);

      g_value_set_object (value, ((GList *)iter->user_data)->data);

    }

}

static gboolean

view_column_model_iter_next (GtkTreeModel  *tree_model,

			     GtkTreeIter   *iter)

{

  ViewColumnModel *view_model = (ViewColumnModel *)tree_model;

  g_return_val_if_fail (view_model->stamp == iter->stamp, FALSE);

  g_return_val_if_fail (iter->user_data != NULL, FALSE);

  iter->user_data = ((GList *)iter->user_data)->next;

  return iter->user_data != NULL;

}

static gboolean

view_column_model_iter_children (GtkTreeModel *tree_model,

				 GtkTreeIter  *iter,

				 GtkTreeIter  *parent)

{

  ViewColumnModel *view_model = (ViewColumnModel *)tree_model;

  /* this is a list, nodes have no children */

  if (parent)

    return FALSE;

  /* but if parent == NULL we return the list itself as children of the

   * "root"

   */

  if (view_model->columns)

    {

      iter->stamp = view_model->stamp;

      iter->user_data = view_model->columns;

      return TRUE;

    }

  else

    return FALSE;

}

static gboolean

view_column_model_iter_has_child (GtkTreeModel *tree_model,

				  GtkTreeIter  *iter)

{

  return FALSE;

}

static gint

view_column_model_iter_n_children (GtkTreeModel *tree_model,

				   GtkTreeIter  *iter)

{

  return g_list_length (((ViewColumnModel *)tree_model)->columns);

}

static gint

view_column_model_iter_nth_child (GtkTreeModel *tree_model,

 				  GtkTreeIter  *iter,

				  GtkTreeIter  *parent,

				  gint          n)

{

  ViewColumnModel *view_model = (ViewColumnModel *)tree_model;

  if (parent)

    return FALSE;

  iter->stamp = view_model->stamp;

  iter->user_data = g_list_nth ((GList *)view_model->columns, n);

  return (iter->user_data != NULL);

}

static gboolean

view_column_model_iter_parent (GtkTreeModel *tree_model,

			       GtkTreeIter  *iter,

			       GtkTreeIter  *child)

{

  return FALSE;

}

static void

view_column_model_tree_model_init (GtkTreeModelIface *iface)

{

  iface->get_n_columns = view_column_model_get_n_columns;

  iface->get_column_type = view_column_model_get_column_type;

  iface->get_iter = view_column_model_get_iter;

  iface->get_path = view_column_model_get_path;

  iface->get_value = view_column_model_get_value;

  iface->iter_next = view_column_model_iter_next;

  iface->iter_children = view_column_model_iter_children;

  iface->iter_has_child = view_column_model_iter_has_child;

  iface->iter_n_children = view_column_model_iter_n_children;

  iface->iter_nth_child = view_column_model_iter_nth_child;

  iface->iter_parent = view_column_model_iter_parent;

}

static gboolean

view_column_model_drag_data_get (GtkTreeDragSource   *drag_source,

				 GtkTreePath         *path,

				 GtkSelectionData    *selection_data)

{

  if (gtk_tree_set_row_drag_data (selection_data,

				  GTK_TREE_MODEL (drag_source),

				  path))

    return TRUE;

  else

    return FALSE;

}

static gboolean

view_column_model_drag_data_delete (GtkTreeDragSource *drag_source,

				    GtkTreePath       *path)

{

  /* Nothing -- we handle moves on the dest side */

  return TRUE;

}

static gboolean

view_column_model_row_drop_possible (GtkTreeDragDest   *drag_dest,

				     GtkTreePath       *dest_path,

				     GtkSelectionData  *selection_data)

{

  GtkTreeModel *src_model;

  if (gtk_tree_get_row_drag_data (selection_data,

				  &src_model,

				  NULL))

    {

      if (src_model == left_tree_model ||

	  src_model == top_right_tree_model ||

	  src_model == bottom_right_tree_model)

	return TRUE;

    }

  return FALSE;

}

static gboolean

view_column_model_drag_data_received (GtkTreeDragDest   *drag_dest,

				      GtkTreePath       *dest,

				      GtkSelectionData  *selection_data)

{

  GtkTreeModel *src_model;

  GtkTreePath *src_path = NULL;

  gboolean retval = FALSE;

  if (gtk_tree_get_row_drag_data (selection_data,

				  &src_model,

				  &src_path))

    {

      GtkTreeIter src_iter;

      GtkTreeIter dest_iter;

      gboolean have_dest;

      /* We are a little lazy here, and assume if we can't convert dest

       * to an iter, we need to append. See gtkliststore.c for a more

       * careful handling of this.

       */

      have_dest = gtk_tree_model_get_iter (GTK_TREE_MODEL (drag_dest), &dest_iter, dest);

      if (gtk_tree_model_get_iter (src_model, &src_iter, src_path))

	{

	  if (src_model == left_tree_model ||

	      src_model == top_right_tree_model ||

	      src_model == bottom_right_tree_model)

	    {

	      move_row (src_model, &src_iter, GTK_TREE_MODEL (drag_dest),

			have_dest ? &dest_iter : NULL);

	      retval = TRUE;

	    }

	}

      gtk_tree_path_free (src_path);

    }

  return retval;

}

static void

view_column_model_drag_source_init (GtkTreeDragSourceIface *iface)

{

  iface->drag_data_get = view_column_model_drag_data_get;

  iface->drag_data_delete = view_column_model_drag_data_delete;

}

static void

view_column_model_drag_dest_init (GtkTreeDragDestIface *iface)

{

  iface->drag_data_received = view_column_model_drag_data_received;

  iface->row_drop_possible = view_column_model_row_drop_possible;

}

GType

view_column_model_get_type (void)

{

  static GType view_column_model_type = 0;

  if (!view_column_model_type)

    {

      const GTypeInfo view_column_model_info =

      {

	sizeof (GtkListStoreClass),

	NULL,		/* base_init */

	NULL,		/* base_finalize */

        NULL,		/* class_init */

	NULL,		/* class_finalize */

	NULL,		/* class_data */

        sizeof (GtkListStore),

	0,

        (GInstanceInitFunc) view_column_model_init,

      };

      const GInterfaceInfo tree_model_info =

      {

	(GInterfaceInitFunc) view_column_model_tree_model_init,

	NULL,

	NULL

      };

      const GInterfaceInfo drag_source_info =

      {

	(GInterfaceInitFunc) view_column_model_drag_source_init,

	NULL,

	NULL

      };

      const GInterfaceInfo drag_dest_info =

      {

	(GInterfaceInitFunc) view_column_model_drag_dest_init,

	NULL,

	NULL

      };

      view_column_model_type = g_type_register_static (G_TYPE_OBJECT, "ViewModelColumn", &view_column_model_info, 0);

      g_type_add_interface_static (view_column_model_type,

				   GTK_TYPE_TREE_MODEL,

				   &tree_model_info);

      g_type_add_interface_static (view_column_model_type,

				   GTK_TYPE_TREE_DRAG_SOURCE,

				   &drag_source_info);

      g_type_add_interface_static (view_column_model_type,

				   GTK_TYPE_TREE_DRAG_DEST,

				   &drag_dest_info);

    }

  return view_column_model_type;

}

static void

update_columns (GtkTreeView *view, ViewColumnModel *view_model)

{

  GList *old_columns = view_model->columns;

  gint old_length, length;

  GList *a, *b;

  view_model->columns = gtk_tree_view_get_columns (view_model->view);

  /* As the view tells us one change at a time, we can do this hack. */

  length = g_list_length (view_model->columns);

  old_length = g_list_length (old_columns);

  if (length != old_length)

    {

      GtkTreePath *path;

      gint i = 0;

      /* where are they different */

      for (a = old_columns, b = view_model->columns; a && b; a = a->next, b = b->next)

	{

	  if (a->data != b->data)

	    break;

	  i++;

	}

      path = gtk_tree_path_new ();

      gtk_tree_path_append_index (path, i);

      if (length < old_length)

	{

	  view_model->stamp++;

	  gtk_tree_model_row_deleted (GTK_TREE_MODEL (view_model), path);

	}

      else

	{

	  GtkTreeIter iter;

	  iter.stamp = view_model->stamp;

	  iter.user_data = b;

	  gtk_tree_model_row_inserted (GTK_TREE_MODEL (view_model), path, &iter);

	}

      gtk_tree_path_free (path);

    }

  else

    {

      gint i;

      gint m = 0, n = 1;

      gint *new_order;

      GtkTreePath *path;

      new_order = g_new (int, length);

      a = old_columns; b = view_model->columns;

      while (a->data == b->data)

	{

	  a = a->next;

	  b = b->next;

	  if (a == NULL)

	    return;

	  m++;

	}

      if (a->next->data == b->data)

	{

	  b = b->next;

	  while (b->data != a->data)

	    {

	      b = b->next;

	      n++;

	    }

	  for (i = 0; i < m; i++)

	    new_order[i] = i;

	  for (i = m; i < m+n; i++)

	    new_order[i] = i+1;

	  new_order[i] = m;

	  for (i = m + n +1; i < length; i++)

	    new_order[i] = i;

	}

      else

	{

	  a = a->next;

	  while (a->data != b->data)

	    {

	      a = a->next;

	      n++;

	    }

	  for (i = 0; i < m; i++)

	    new_order[i] = i;

	  new_order[m] = m+n;

	  for (i = m+1; i < m + n+ 1; i++)

	    new_order[i] = i - 1;

	  for (i = m + n + 1; i < length; i++)

	    new_order[i] = i;

	}

      path = gtk_tree_path_new ();

      gtk_tree_model_rows_reordered (GTK_TREE_MODEL (view_model),

				     path,

				     NULL,

				     new_order);

      gtk_tree_path_free (path);

      g_free (new_order);

    }

  if (old_columns)

    g_list_free (old_columns);

}

static GtkTreeModel *

view_column_model_new (GtkTreeView *view)

{

  GtkTreeModel *retval;

  retval = g_object_new (view_column_model_get_type (), NULL);

  ((ViewColumnModel *)retval)->view = view;

  ((ViewColumnModel *)retval)->columns = gtk_tree_view_get_columns (view);

  g_signal_connect (view, "columns_changed", G_CALLBACK (update_columns), retval);

  return retval;

}

/* Back to sanity.

 */

static void

add_clicked (GtkWidget *button, gpointer data)

{

  static gint i = 0;

  GtkTreeIter iter;

  GtkTreeViewColumn *column;

  GtkTreeSelection *selection;

  GtkCellRenderer *cell;

  gchar *label = g_strdup_printf ("Column %d", i);

  cell = gtk_cell_renderer_text_new ();

  column = gtk_tree_view_column_new_with_attributes (label, cell, "text", 0, NULL);

  g_object_set_data_full (G_OBJECT (column), column_data, label, g_free);

  gtk_tree_view_column_set_reorderable (column, TRUE);

  gtk_tree_view_column_set_sizing (column, GTK_TREE_VIEW_COLUMN_GROW_ONLY);

  gtk_tree_view_column_set_resizable (column, TRUE);

  gtk_list_store_append (GTK_LIST_STORE (left_tree_model), &iter);

  gtk_list_store_set (GTK_LIST_STORE (left_tree_model), &iter, 0, label, 1, column, -1);

  i++;

  selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (left_tree_view));

  gtk_tree_selection_select_iter (selection, &iter);

}

static void

get_visible (GtkTreeViewColumn *tree_column,

	     GtkCellRenderer   *cell,

	     GtkTreeModel      *tree_model,

	     GtkTreeIter       *iter,

	     gpointer           data)

{

  GtkTreeViewColumn *column;

  gtk_tree_model_get (tree_model, iter, 1, &column, -1);

  if (column)

    {

      gtk_cell_renderer_toggle_set_active (GTK_CELL_RENDERER_TOGGLE (cell),

					   gtk_tree_view_column_get_visible (column));

    }

}

static void

set_visible (GtkCellRendererToggle *cell,

	     gchar                 *path_str,

	     gpointer               data)

{

  GtkTreeView *tree_view = (GtkTreeView *) data;

  GtkTreeViewColumn *column;

  GtkTreeModel *model;

  GtkTreeIter iter;

  GtkTreePath *path = gtk_tree_path_new_from_string (path_str);

  model = gtk_tree_view_get_model (tree_view);

  gtk_tree_model_get_iter (model, &iter, path);

  gtk_tree_model_get (model, &iter, 1, &column, -1);

  if (column)

    {

      gtk_tree_view_column_set_visible (column, ! gtk_tree_view_column_get_visible (column));

      gtk_tree_model_row_changed (model, path, &iter);

    }

  gtk_tree_path_free (path);

}

static void

move_to_left (GtkTreeModel *src,

	      GtkTreeIter  *src_iter,

	      GtkTreeIter  *dest_iter)

{

  GtkTreeIter iter;

  GtkTreeViewColumn *column;

  GtkTreeSelection *selection;

  gchar *label;

  gtk_tree_model_get (src, src_iter, 0, &label, 1, &column, -1);

  if (src == top_right_tree_model)

    gtk_tree_view_remove_column (GTK_TREE_VIEW (sample_tree_view_top), column);

  else

    gtk_tree_view_remove_column (GTK_TREE_VIEW (sample_tree_view_bottom), column);

  /*  gtk_list_store_remove (GTK_LIST_STORE (gtk_tree_view_get_model (GTK_TREE_VIEW (data))), &iter);*/

  /* Put it back on the left */

  if (dest_iter)

    gtk_list_store_insert_before (GTK_LIST_STORE (left_tree_model),

				  &iter, dest_iter);

  else

    gtk_list_store_append (GTK_LIST_STORE (left_tree_model), &iter);

  gtk_list_store_set (GTK_LIST_STORE (left_tree_model), &iter, 0, label, 1, column, -1);

  selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (left_tree_view));

  gtk_tree_selection_select_iter (selection, &iter);

  g_free (label);

}

static void

move_to_right (GtkTreeIter  *src_iter,

	       GtkTreeModel *dest,

	       GtkTreeIter  *dest_iter)

{

  gchar *label;

  GtkTreeViewColumn *column;

  gint before = -1;

  gtk_tree_model_get (GTK_TREE_MODEL (left_tree_model),

		      src_iter, 0, &label, 1, &column, -1);

  gtk_list_store_remove (GTK_LIST_STORE (left_tree_model), src_iter);

  if (dest_iter)

    {

      GtkTreePath *path = gtk_tree_model_get_path (dest, dest_iter);

      before = (gtk_tree_path_get_indices (path))[0];

      gtk_tree_path_free (path);

    }

  if (dest == top_right_tree_model)

    gtk_tree_view_insert_column (GTK_TREE_VIEW (sample_tree_view_top), column, before);

  else

    gtk_tree_view_insert_column (GTK_TREE_VIEW (sample_tree_view_bottom), column, before);

  g_free (label);

}

static void

move_up_or_down (GtkTreeModel *src,

		 GtkTreeIter  *src_iter,

		 GtkTreeModel *dest,

		 GtkTreeIter  *dest_iter)

{

  GtkTreeViewColumn *column;

  gchar *label;

  gint before = -1;

  gtk_tree_model_get (src, src_iter, 0, &label, 1, &column, -1);

  if (dest_iter)

    {

      GtkTreePath *path = gtk_tree_model_get_path (dest, dest_iter);

      before = (gtk_tree_path_get_indices (path))[0];

      gtk_tree_path_free (path);

    }

  if (src == top_right_tree_model)

    gtk_tree_view_remove_column (GTK_TREE_VIEW (sample_tree_view_top), column);

  else

    gtk_tree_view_remove_column (GTK_TREE_VIEW (sample_tree_view_bottom), column);

  if (dest == top_right_tree_model)

    gtk_tree_view_insert_column (GTK_TREE_VIEW (sample_tree_view_top), column, before);

  else

    gtk_tree_view_insert_column (GTK_TREE_VIEW (sample_tree_view_bottom), column, before);

  g_free (label);

}

static void

move_row  (GtkTreeModel *src,

	   GtkTreeIter  *src_iter,

	   GtkTreeModel *dest,

	   GtkTreeIter  *dest_iter)

{

  if (src == left_tree_model)

    move_to_right (src_iter, dest, dest_iter);

  else if (dest == left_tree_model)

    move_to_left (src, src_iter, dest_iter);

  else 

    move_up_or_down (src, src_iter, dest, dest_iter);

}

static void

add_left_clicked (GtkWidget *button,

		  gpointer data)

{

  GtkTreeIter iter;

  GtkTreeSelection *selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (data));

  gtk_tree_selection_get_selected (selection, NULL, &iter);

  move_to_left (gtk_tree_view_get_model (GTK_TREE_VIEW (data)), &iter, NULL);

}

static void

add_right_clicked (GtkWidget *button, gpointer data)

{

  GtkTreeIter iter;

  GtkTreeSelection *selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (left_tree_view));

  gtk_tree_selection_get_selected (selection, NULL, &iter);

  move_to_right (&iter, gtk_tree_view_get_model (GTK_TREE_VIEW (data)), NULL);

}

static void

selection_changed (GtkTreeSelection *selection, GtkWidget *button)

{

  if (gtk_tree_selection_get_selected (selection, NULL, NULL))

    gtk_widget_set_sensitive (button, TRUE);

  else

    gtk_widget_set_sensitive (button, FALSE);

}

static GtkTargetEntry row_targets[] = {

  { "GTK_TREE_MODEL_ROW", GTK_TARGET_SAME_APP, 0}

};

int

main (int argc, char *argv[])

{

  GtkWidget *window;

  GtkWidget *hbox, *vbox;

  GtkWidget *vbox2, *bbox;

  GtkWidget *button;

  GtkTreeViewColumn *column;

  GtkCellRenderer *cell;

  GtkWidget *swindow;

  GtkTreeModel *sample_model;

  gint i;

  gtk_init (&argc, &argv);

  /* First initialize all the models for signal purposes */

  left_tree_model = (GtkTreeModel *) gtk_list_store_new (2, G_TYPE_STRING, G_TYPE_POINTER);

  sample_model = (GtkTreeModel *) gtk_list_store_new (1, G_TYPE_STRING);

  sample_tree_view_top = gtk_tree_view_new_with_model (sample_model);

  sample_tree_view_bottom = gtk_tree_view_new_with_model (sample_model);

  top_right_tree_model = (GtkTreeModel *) view_column_model_new (GTK_TREE_VIEW (sample_tree_view_top));

  bottom_right_tree_model = (GtkTreeModel *) view_column_model_new (GTK_TREE_VIEW (sample_tree_view_bottom));

  top_right_tree_view = gtk_tree_view_new_with_model (top_right_tree_model);

  bottom_right_tree_view = gtk_tree_view_new_with_model (bottom_right_tree_model);

  for (i = 0; i < 10; i++)

    {

      GtkTreeIter iter;

      gchar *string = g_strdup_printf ("%d", i);

      gtk_list_store_append (GTK_LIST_STORE (sample_model), &iter);

      gtk_list_store_set (GTK_LIST_STORE (sample_model), &iter, 0, string, -1);

      g_free (string);

    }

  /* Set up the test windows. */

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL); 

  gtk_window_set_default_size (GTK_WINDOW (window), 300, 300);

  gtk_window_set_title (GTK_WINDOW (window), "Top Window");

  swindow = gtk_scrolled_window_new (NULL, NULL);

  gtk_container_add (GTK_CONTAINER (window), swindow);

  gtk_container_add (GTK_CONTAINER (swindow), sample_tree_view_top);

  gtk_widget_show_all (window);

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL); 

  gtk_window_set_default_size (GTK_WINDOW (window), 300, 300);

  gtk_window_set_title (GTK_WINDOW (window), "Bottom Window");

  swindow = gtk_scrolled_window_new (NULL, NULL);

  gtk_container_add (GTK_CONTAINER (window), swindow);

  gtk_container_add (GTK_CONTAINER (swindow), sample_tree_view_bottom);

  gtk_widget_show_all (window);

  /* Set up the main window */

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL); 

  gtk_window_set_default_size (GTK_WINDOW (window), 500, 300);

  vbox = gtk_vbox_new (FALSE, 8);

  gtk_container_set_border_width (GTK_CONTAINER (vbox), 8);

  gtk_container_add (GTK_CONTAINER (window), vbox);

  hbox = gtk_hbox_new (FALSE, 8);

  gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, 0);

  /* Left Pane */

  cell = gtk_cell_renderer_text_new ();

  swindow = gtk_scrolled_window_new (NULL, NULL);

  gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (swindow), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);

  left_tree_view = gtk_tree_view_new_with_model (left_tree_model);

  gtk_container_add (GTK_CONTAINER (swindow), left_tree_view);

  gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (left_tree_view), -1,

					       "Unattached Columns", cell, "text", 0, NULL);

  cell = gtk_cell_renderer_toggle_new ();

  g_signal_connect (cell, "toggled", G_CALLBACK (set_visible), left_tree_view);

  column = gtk_tree_view_column_new_with_attributes ("Visible", cell, NULL);

  gtk_tree_view_append_column (GTK_TREE_VIEW (left_tree_view), column);

  gtk_tree_view_column_set_cell_data_func (column, cell, get_visible, NULL, NULL);

  gtk_box_pack_start (GTK_BOX (hbox), swindow, TRUE, TRUE, 0);

  /* Middle Pane */

  vbox2 = gtk_vbox_new (FALSE, 8);

  gtk_box_pack_start (GTK_BOX (hbox), vbox2, FALSE, FALSE, 0);

  bbox = gtk_vbutton_box_new ();

  gtk_button_box_set_layout (GTK_BUTTON_BOX (bbox), GTK_BUTTONBOX_SPREAD);

  gtk_box_pack_start (GTK_BOX (vbox2), bbox, TRUE, TRUE, 0);

  button = gtk_button_new_with_mnemonic ("<< (_Q)");

  gtk_widget_set_sensitive (button, FALSE);

  g_signal_connect (button, "clicked", G_CALLBACK (add_left_clicked), top_right_tree_view);

  g_signal_connect (gtk_tree_view_get_selection (GTK_TREE_VIEW (top_right_tree_view)),

                    "changed", G_CALLBACK (selection_changed), button);

  gtk_box_pack_start (GTK_BOX (bbox), button, FALSE, FALSE, 0);

  button = gtk_button_new_with_mnemonic (">> (_W)");

  gtk_widget_set_sensitive (button, FALSE);

  g_signal_connect (button, "clicked", G_CALLBACK (add_right_clicked), top_right_tree_view);

  g_signal_connect (gtk_tree_view_get_selection (GTK_TREE_VIEW (left_tree_view)),

                    "changed", G_CALLBACK (selection_changed), button);

  gtk_box_pack_start (GTK_BOX (bbox), button, FALSE, FALSE, 0);

  bbox = gtk_vbutton_box_new ();

  gtk_button_box_set_layout (GTK_BUTTON_BOX (bbox), GTK_BUTTONBOX_SPREAD);

  gtk_box_pack_start (GTK_BOX (vbox2), bbox, TRUE, TRUE, 0);

  button = gtk_button_new_with_mnemonic ("<< (_E)");

  gtk_widget_set_sensitive (button, FALSE);

  g_signal_connect (button, "clicked", G_CALLBACK (add_left_clicked), bottom_right_tree_view);

  g_signal_connect (gtk_tree_view_get_selection (GTK_TREE_VIEW (bottom_right_tree_view)),

                    "changed", G_CALLBACK (selection_changed), button);

  gtk_box_pack_start (GTK_BOX (bbox), button, FALSE, FALSE, 0);

  button = gtk_button_new_with_mnemonic (">> (_R)");

  gtk_widget_set_sensitive (button, FALSE);

  g_signal_connect (button, "clicked", G_CALLBACK (add_right_clicked), bottom_right_tree_view);

  g_signal_connect (gtk_tree_view_get_selection (GTK_TREE_VIEW (left_tree_view)),

                    "changed", G_CALLBACK (selection_changed), button);

  gtk_box_pack_start (GTK_BOX (bbox), button, FALSE, FALSE, 0);

  /* Right Pane */