X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fui%2Fgui%2Fpsppire-data-store.c;h=45104f5cbb8ff519418fee88edf92e496e91652c;hb=4eb2e820b01d92ef662c741f5ac30f08bedd1de6;hp=5b40635b66606553f6545f342f56b5c67b6b63d8;hpb=1ce1429567835f83a712a8a76ab80db64360d742;p=pspp

diff --git a/src/ui/gui/psppire-data-store.c b/src/ui/gui/psppire-data-store.c
index 5b40635b66..f97b8eaf1c 100644
--- a/src/ui/gui/psppire-data-store.c
+++ b/src/ui/gui/psppire-data-store.c
@@ -1,12 +1,10 @@
-/* psppire-data-store.c
- 
-   PSPPIRE --- A Graphical User Interface for PSPP
-   Copyright (C) 2006  Free Software Foundation
-   Written by John Darrington
+/* PSPPIRE - a graphical user interface for PSPP.
+   Copyright (C) 2006, 2008, 2009, 2010, 2011, 2012,
+   2013, 2016, 2017  Free Software Foundation
 
-   This program is free software; you can redistribute it and/or modify
+   This program 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 of the License, or
+   the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
@@ -15,56 +13,260 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-   02110-1301, USA. */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 
 #include <config.h>
 #include <string.h>
 #include <stdlib.h>
-#include <minmax.h>
+#include <gettext.h>
+#define _(msgid) gettext (msgid)
+#define P_(msgid) msgid
 
-#include <gtksheet/gtksheet.h>
-#include <gtksheet/gsheetmodel.h>
-#include <gtksheet/gsheet-column-iface.h>
+#include <data/datasheet.h>
+#include <data/data-out.h>
+#include <data/variable.h>
+
+#include <ui/gui/psppire-marshal.h>
+
+#include <pango/pango-context.h>
 
-#include "psppire-variable.h"
 #include "psppire-data-store.h"
+#include <libpspp/i18n.h>
 #include "helper.h"
 
 #include <data/dictionary.h>
 #include <data/missing-values.h>
 #include <data/value-labels.h>
 #include <data/data-in.h>
+#include <data/format.h>
 
-#include <data/file-handle-def.h>
-#include <data/sys-file-writer.h>
+#include <math/sort.h>
 
-#define _(A) A
-#define N_(A) A
+#include "xalloc.h"
+#include "xmalloca.h"
 
+#include "value-variant.h"
 
 static void psppire_data_store_init            (PsppireDataStore      *data_store);
 static void psppire_data_store_class_init      (PsppireDataStoreClass *class);
-static void psppire_data_store_sheet_model_init (GSheetModelIface *iface);
-static void psppire_data_store_sheet_column_init (GSheetColumnIface *iface);
+
 static void psppire_data_store_finalize        (GObject           *object);
+static void psppire_data_store_dispose        (GObject           *object);
+
+static gboolean psppire_data_store_insert_case (PsppireDataStore *ds,
+						struct ccase *cc,
+						casenumber posn);
 
-static const gchar *psppire_data_store_get_string(GSheetModel *sheet_model, gint row, gint column);
 
-static gboolean psppire_data_store_set_string(GSheetModel *model, 
-					  const gchar *text, gint row, gint column);
+static gboolean psppire_data_store_data_in (PsppireDataStore *ds,
+					    casenumber casenum, gint idx,
+					    struct substring input,
+					    const struct fmt_spec *fmt);
 
-static gboolean psppire_data_store_clear_datum(GSheetModel *model, 
-					  gint row, gint column);
+static GObjectClass *parent_class = NULL;
 
 
-#define MIN_COLUMNS 10
+enum
+  {
+    ITEMS_CHANGED,
+    CASE_CHANGED,
+    n_SIGNALS
+  };
 
+static guint signals [n_SIGNALS];
 
-static GObjectClass *parent_class = NULL;
+static gint
+__tree_model_iter_n_children (GtkTreeModel *tree_model,
+			     GtkTreeIter *iter)
+{
+  PsppireDataStore *store  = PSPPIRE_DATA_STORE (tree_model);
+
+  if (store->datasheet == NULL)
+    return 0;
+
+  gint n =  datasheet_get_n_rows (store->datasheet);
+
+  return n;
+}
+
+static GtkTreeModelFlags
+__tree_model_get_flags (GtkTreeModel *model)
+{
+  g_return_val_if_fail (PSPPIRE_IS_DATA_STORE (model), (GtkTreeModelFlags) 0);
+
+  return GTK_TREE_MODEL_LIST_ONLY;
+}
+
+static gint
+__tree_model_get_n_columns (GtkTreeModel *tree_model)
+{
+  PsppireDataStore *store  = PSPPIRE_DATA_STORE (tree_model);
+
+  return psppire_dict_get_var_cnt (store->dict);
+}
+
+
+static gboolean
+__iter_nth_child (GtkTreeModel *tree_model,
+		  GtkTreeIter *iter,
+		  GtkTreeIter *parent,
+		  gint n)
+{
+  PsppireDataStore *store  = PSPPIRE_DATA_STORE (tree_model);
+
+  g_assert (parent == NULL);
+  g_return_val_if_fail (store, FALSE);
+
+  if (!store->datasheet || n >= datasheet_get_n_rows (store->datasheet))
+    {
+      iter->stamp = -1;
+      iter->user_data = NULL;
+      return FALSE;
+    }
+
+  iter->user_data = GINT_TO_POINTER (n);
+  iter->stamp = store->stamp;
+
+  return TRUE;
+}
+
+/* Set the contents of OUT to reflect the information provided by IN, COL, and
+   ROW, for MODEL.  Returns TRUE if successful. */
+gboolean
+psppire_data_store_string_to_value (GtkTreeModel *model, gint col, gint row,
+				    const gchar *in, GValue *out)
+{
+  PsppireDataStore *store = PSPPIRE_DATA_STORE (model);
+
+  while (col >= psppire_dict_get_var_cnt (store->dict))
+    {
+      const struct variable *var =
+	psppire_dict_insert_variable (store->dict,
+				      psppire_dict_get_var_cnt (store->dict),
+				      NULL);
+      g_return_val_if_fail (var, FALSE);
+    }
+
+  const struct variable *variable = psppire_dict_get_variable (store->dict, col);
+  g_return_val_if_fail (variable, FALSE);
+
+  const struct fmt_spec *fmt = var_get_print_format (variable);
+
+  int width = var_get_width (variable);
+
+  union value val;
+  value_init (&val, width);
+  char *xx =
+    data_in (ss_cstr (in), psppire_dict_encoding (store->dict),
+	     fmt->type, &val, width, "UTF-8");
+
+  GVariant *vrnt = value_variant_new (&val, width);
+  value_destroy (&val, width);
+
+  g_value_init (out, G_TYPE_VARIANT);
+  g_value_set_variant (out, vrnt);
+  free (xx);
+  return TRUE;
+}
+
+static char *
+unlabeled_value (PsppireDataStore *store, const struct variable *variable, const union value *val)
+{
+  const struct fmt_spec *fmt = var_get_print_format (variable);
+  return data_out (val, psppire_dict_encoding (store->dict),  fmt);
+}
+
+gchar *
+psppire_data_store_value_to_string (gpointer unused, PsppireDataStore *store, gint col, gint row, const GValue *v)
+{
+  const struct variable *variable = psppire_dict_get_variable (store->dict, col);
+  g_return_val_if_fail (variable, g_strdup ("???"));
+
+  GVariant *vrnt = g_value_get_variant (v);
+  union value val;
+  value_variant_get (&val, vrnt);
+
+  char *out = unlabeled_value (store, variable, &val);
+
+  value_destroy_from_variant (&val, vrnt);
+
+  return out;
+}
+
+gchar *
+psppire_data_store_value_to_string_with_labels (gpointer unused, PsppireDataStore *store, gint col, gint row, const GValue *v)
+{
+  const struct variable *variable = psppire_dict_get_variable (store->dict, col);
+  g_return_val_if_fail (variable, g_strdup ("???"));
+
+  GVariant *vrnt = g_value_get_variant (v);
+  union value val;
+  value_variant_get (&val, vrnt);
+
+  char *out = NULL;
+
+  const struct val_labs *vls = var_get_value_labels (variable);
+  struct val_lab *vl = val_labs_lookup (vls, &val);
+  if (vl != NULL)
+    out = strdup (val_lab_get_label (vl));
+  else
+    out = unlabeled_value (store, variable, &val);
+
+  value_destroy_from_variant (&val, vrnt);
+
+  return out;
+}
+
+static void
+__get_value (GtkTreeModel *tree_model,
+	     GtkTreeIter *iter,
+	     gint column,
+	     GValue *value)
+{
+  PsppireDataStore *store  = PSPPIRE_DATA_STORE (tree_model);
+
+  g_return_if_fail (iter->stamp == store->stamp);
+
+  const struct variable *variable = psppire_dict_get_variable (store->dict, column);
+  if (NULL == variable)
+    return;
+
+  g_value_init (value, G_TYPE_VARIANT);
+
+  gint row = GPOINTER_TO_INT (iter->user_data);
+
+  struct ccase *cc = datasheet_get_row (store->datasheet, row);
+
+  const union value *val = case_data_idx (cc, var_get_case_index (variable));
+
+  GVariant *vv = value_variant_new (val, var_get_width (variable));
+
+  g_value_set_variant (value, vv);
 
-inline GType
+  case_unref (cc);
+}
+
+
+static void
+__tree_model_init (GtkTreeModelIface *iface)
+{
+  iface->get_flags       = __tree_model_get_flags;
+  iface->get_n_columns   = __tree_model_get_n_columns ;
+  iface->get_column_type = NULL;
+  iface->get_iter        = NULL;
+  iface->iter_next       = NULL;
+  iface->get_path        = NULL;
+  iface->get_value       = __get_value;
+
+  iface->iter_children   = NULL;
+  iface->iter_has_child  = NULL;
+  iface->iter_n_children = __tree_model_iter_n_children;
+  iface->iter_nth_child  = __iter_nth_child;
+  iface->iter_parent     = NULL;
+}
+
+
+GType
 psppire_data_store_get_type (void)
 {
   static GType data_store_type = 0;
@@ -84,38 +286,24 @@ psppire_data_store_get_type (void)
         (GInstanceInitFunc) psppire_data_store_init,
       };
 
-      static const GInterfaceInfo sheet_model_info =
-      {
-	(GInterfaceInitFunc) psppire_data_store_sheet_model_init,
-	NULL,
-	NULL
-      };
-
-      static const GInterfaceInfo sheet_column_info =
-      {
-	(GInterfaceInitFunc) psppire_data_store_sheet_column_init,
+      static const GInterfaceInfo tree_model_info = {
+	(GInterfaceInitFunc) __tree_model_init,
 	NULL,
 	NULL
       };
 
-
-
-      data_store_type = g_type_register_static (G_TYPE_OBJECT, "PsppireDataStore",
+      data_store_type = g_type_register_static (G_TYPE_OBJECT,
+						"PsppireDataStore",
 						&data_store_info, 0);
 
-      g_type_add_interface_static (data_store_type,
-				   G_TYPE_SHEET_MODEL,
-				   &sheet_model_info);
-
-      g_type_add_interface_static (data_store_type,
-				   G_TYPE_SHEET_COLUMN,
-				   &sheet_column_info);
-
+      g_type_add_interface_static (data_store_type, GTK_TYPE_TREE_MODEL,
+				   &tree_model_info);
     }
 
   return data_store_type;
 }
 
+
 static void
 psppire_data_store_class_init (PsppireDataStoreClass *class)
 {
@@ -125,155 +313,142 @@ psppire_data_store_class_init (PsppireDataStoreClass *class)
   object_class = (GObjectClass*) class;
 
   object_class->finalize = psppire_data_store_finalize;
-}
-
+  object_class->dispose = psppire_data_store_dispose;
 
+  signals [ITEMS_CHANGED] =
+    g_signal_new ("items-changed",
+		  G_TYPE_FROM_CLASS (class),
+		  G_SIGNAL_RUN_FIRST,
+		  0,
+		  NULL, NULL,
+		  psppire_marshal_VOID__UINT_UINT_UINT,
+		  G_TYPE_NONE,
+		  3,
+		  G_TYPE_UINT,  /* Index of the start of the change */
+		  G_TYPE_UINT,  /* The number of items deleted */
+		  G_TYPE_UINT); /* The number of items inserted */
 
-static gint
-psppire_data_store_get_var_count (const GSheetModel *model)
-{
-  const PsppireDataStore *store = PSPPIRE_DATA_STORE(model);
-  
-  return psppire_dict_get_var_cnt(store->dict);
+  signals [CASE_CHANGED] =
+    g_signal_new ("case-changed",
+		  G_TYPE_FROM_CLASS (class),
+		  G_SIGNAL_RUN_FIRST,
+		  0,
+		  NULL, NULL,
+		  g_cclosure_marshal_VOID__INT,
+		  G_TYPE_NONE,
+		  1,
+		  G_TYPE_INT);
 }
 
-static gint
-psppire_data_store_get_case_count (const GSheetModel *model)
-{
-  const PsppireDataStore *store = PSPPIRE_DATA_STORE(model);
-
-  return psppire_case_array_get_n_cases(store->cases);
-}
 
 
-static void
-psppire_data_store_init (PsppireDataStore *data_store)
+casenumber
+psppire_data_store_get_case_count (const PsppireDataStore *store)
 {
-  data_store->dict = 0;
-  data_store->cases = 0;
+  return datasheet_get_n_rows (store->datasheet);
 }
 
-const PangoFontDescription *
-psppire_data_store_get_font_desc(GSheetModel *model,
-			      gint row, gint column)
+size_t
+psppire_data_store_get_value_count (const PsppireDataStore *store)
 {
-  PsppireDataStore *store = PSPPIRE_DATA_STORE(model);
-  
-  return store->font_desc;
+  return psppire_dict_get_value_cnt (store->dict);
 }
 
-
-static void
-psppire_data_store_sheet_model_init (GSheetModelIface *iface)
+const struct caseproto *
+psppire_data_store_get_proto (const PsppireDataStore *store)
 {
-  iface->free_strings = TRUE;
-  iface->get_string = psppire_data_store_get_string;
-  iface->set_string = psppire_data_store_set_string;
-  iface->clear_datum = psppire_data_store_clear_datum;
-  iface->is_editable = NULL;
-  iface->is_visible = NULL;
-  iface->get_foreground = NULL;
-  iface->get_background = NULL;
-  iface->get_font_desc = psppire_data_store_get_font_desc;
-  iface->get_cell_border = NULL;
-  iface->get_column_count = psppire_data_store_get_var_count;
-  iface->get_row_count = psppire_data_store_get_case_count;
+  return psppire_dict_get_proto (store->dict);
 }
 
-static
-gboolean always_true()
+static void
+psppire_data_store_init (PsppireDataStore *data_store)
 {
-  return TRUE;
+  data_store->dict = NULL;
+  data_store->datasheet = NULL;
+  data_store->dispose_has_run = FALSE;
+  data_store->stamp = g_random_int ();
 }
 
 
 static void
-delete_cases_callback(GtkWidget *w, gint first, gint n_cases, gpointer data)
+psppire_data_store_delete_value (PsppireDataStore *store, gint case_index)
 {
-  PsppireDataStore *store  ;
-
-  g_return_if_fail (data);
-
-  store  = PSPPIRE_DATA_STORE(data);
-
-  g_assert(first >= 0);
-
-  g_sheet_model_rows_deleted (G_SHEET_MODEL(store), first, n_cases);
+  g_return_if_fail (store->datasheet);
+  datasheet_delete_columns (store->datasheet, case_index, 1);
+  datasheet_insert_column (store->datasheet, NULL, -1, case_index);
 }
 
 
+/*
+   A callback which occurs after a variable has been deleted.
+ */
 static void
-insert_case_callback(GtkWidget *w, gint casenum, gpointer data)
+delete_variable_callback (GObject *obj, const struct variable *var UNUSED,
+                          gint dict_index, gint case_index,
+                          gpointer data)
 {
-  PsppireDataStore *store  ;
+  PsppireDataStore *store  = PSPPIRE_DATA_STORE (data);
 
-  g_return_if_fail (data);
-
-  store  = PSPPIRE_DATA_STORE(data);
-  
-  g_sheet_model_range_changed (G_SHEET_MODEL(store),
-			       casenum, -1,
-			       psppire_case_array_get_n_cases(store->cases),
-			       -1);
+  psppire_data_store_delete_value (store, case_index);
 }
 
+struct resize_datum_aux
+  {
+    const struct dictionary *dict;
+    const struct variable *new_variable;
+    const struct variable *old_variable;
+  };
 
 static void
-changed_case_callback(GtkWidget *w, gint casenum, gpointer data)
+resize_datum (const union value *old, union value *new, const void *aux_)
 {
-  PsppireDataStore *store  ;
-  g_return_if_fail (data);
-
-  store  = PSPPIRE_DATA_STORE(data);
-  
-  g_sheet_model_range_changed (G_SHEET_MODEL(store),
-				 casenum, -1,
-				 casenum, -1);
-
+  const struct resize_datum_aux *aux = aux_;
+  int new_width = var_get_width (aux->new_variable);
+  const char *enc = dict_get_encoding (aux->dict);
+  const struct fmt_spec *newfmt = var_get_print_format (aux->new_variable);
+  char *s = data_out (old, enc, var_get_print_format (aux->old_variable));
+  enum fmt_type type = (fmt_usable_for_input (newfmt->type)
+                        ? newfmt->type
+                        : FMT_DOLLAR);
+  free (data_in (ss_cstr (s), enc, type, new, new_width, enc));
+  free (s);
 }
 
-
 static void
-delete_variables_callback(GObject *obj, gint var_num, gint n_vars, gpointer data)
+variable_changed_callback (GObject *obj, gint var_num, guint what, const struct variable *oldvar,
+			   gpointer data)
 {
-  PsppireDataStore *store ;
+  PsppireDataStore *store  = PSPPIRE_DATA_STORE (data);
+  struct variable *variable = psppire_dict_get_variable (store->dict, var_num);
 
-  g_return_if_fail (data);
-
-  store  = PSPPIRE_DATA_STORE(data);
-
-  g_sheet_column_columns_deleted(G_SHEET_COLUMN(store),
-				   var_num, n_vars);
-
-  g_sheet_model_columns_deleted (G_SHEET_MODEL(store), var_num, n_vars);
+  if (what & VAR_TRAIT_WIDTH)
+    {
+      int posn = var_get_case_index (variable);
+      struct resize_datum_aux aux;
+      aux.old_variable = oldvar;
+      aux.new_variable = variable;
+      aux.dict = store->dict->dict;
+      datasheet_resize_column (store->datasheet, posn, var_get_width (variable),
+                               resize_datum, &aux);
+    }
 }
 
-
 static void
-insert_variable_callback(GObject *obj, gint var_num, gpointer data)
+insert_variable_callback (GObject *obj, gint var_num, gpointer data)
 {
+  struct variable *variable;
   PsppireDataStore *store;
+  gint posn;
 
   g_return_if_fail (data);
 
-  store  = PSPPIRE_DATA_STORE(data);
-  
-  /* 
-  g_sheet_model_range_changed (G_SHEET_MODEL(store),
-				 casenum, -1,
-				 psppire_case_array_get_n_cases(store->cases),
-				 -1);
-  */
-
-  psppire_case_array_resize(store->cases, 
-			 dict_get_next_value_idx (store->dict->dict));
+  store  = PSPPIRE_DATA_STORE (data);
 
-  g_sheet_model_columns_inserted (G_SHEET_MODEL(store), var_num, 1);
+  variable = psppire_dict_get_variable (store->dict, var_num);
+  posn = var_get_case_index (variable);
+  psppire_data_store_insert_value (store, var_get_width (variable), posn);
 }
 
-
-
-
 /**
  * psppire_data_store_new:
  * @dict: The dictionary for this data_store.
@@ -282,31 +457,47 @@ insert_variable_callback(GObject *obj, gint var_num, gpointer data)
  * Return value: a new #PsppireDataStore
  **/
 PsppireDataStore *
-psppire_data_store_new (PsppireDict *dict, PsppireCaseArray *cases)
+psppire_data_store_new (PsppireDict *dict)
 {
   PsppireDataStore *retval;
 
-  retval = g_object_new (GTK_TYPE_DATA_STORE, NULL);
+  retval = g_object_new (PSPPIRE_TYPE_DATA_STORE, NULL);
 
-  retval->cases = cases;
-  g_signal_connect(cases, "cases-deleted", G_CALLBACK(delete_cases_callback), 
-		   retval);
+  psppire_data_store_set_dictionary (retval, dict);
 
-  g_signal_connect(cases, "case-inserted", G_CALLBACK(insert_case_callback), 
-		   retval);
+  return retval;
+}
 
+void
+psppire_data_store_set_reader (PsppireDataStore *ds,
+			       struct casereader *reader)
+{
+  gint i;
+  gint old_n = 0;
+  if ( ds->datasheet)
+    {
+      old_n = datasheet_get_n_rows (ds->datasheet);
+      datasheet_destroy (ds->datasheet);
+    }
 
-  g_signal_connect(cases, "case-changed", G_CALLBACK(changed_case_callback), 
-		   retval);
+  ds->datasheet = datasheet_create (reader);
 
-  psppire_data_store_set_dictionary(retval, dict);
+  gint new_n = datasheet_get_n_rows (ds->datasheet);
 
+  if ( ds->dict )
+    for (i = 0 ; i < n_dict_signals; ++i )
+      {
+	if ( ds->dict_handler_id [i] > 0)
+	  {
+	    g_signal_handler_unblock (ds->dict,
+				      ds->dict_handler_id[i]);
+	  }
+      }
 
-  return retval;
+  g_signal_emit (ds, signals[ITEMS_CHANGED], 0, 0, old_n, new_n);
 }
 
 
-
 /**
  * psppire_data_store_replace_set_dictionary:
  * @data_store: The variable store
@@ -316,390 +507,413 @@ psppire_data_store_new (PsppireDict *dict, PsppireCaseArray *cases)
  * destroyed.
  **/
 void
-psppire_data_store_set_dictionary(PsppireDataStore *data_store, PsppireDict *dict)
+psppire_data_store_set_dictionary (PsppireDataStore *data_store, PsppireDict *dict)
 {
-#if 0
-  if ( data_store->dict ) g_object_unref(data_store->dict);
-#endif
+  int i;
+
+  /* Disconnect any existing handlers */
+  if ( data_store->dict )
+    for (i = 0 ; i < n_dict_signals; ++i )
+      {
+	g_signal_handler_disconnect (data_store->dict,
+				     data_store->dict_handler_id[i]);
+      }
 
   data_store->dict = dict;
 
-  psppire_case_array_resize(data_store->cases, 
-			 dict_get_next_value_idx (data_store->dict->dict));
+  if ( dict != NULL)
+    {
+
+      data_store->dict_handler_id [VARIABLE_INSERTED] =
+	g_signal_connect (dict, "variable-inserted",
+			  G_CALLBACK (insert_variable_callback),
+			  data_store);
 
+      data_store->dict_handler_id [VARIABLE_DELETED] =
+	g_signal_connect (dict, "variable-deleted",
+			  G_CALLBACK (delete_variable_callback),
+			  data_store);
+
+      data_store->dict_handler_id [VARIABLE_CHANGED] =
+	g_signal_connect (dict, "variable-changed",
+			  G_CALLBACK (variable_changed_callback),
+			  data_store);
+    }
 
-  g_signal_connect(dict, "variable-inserted", 
-		   G_CALLBACK(insert_variable_callback), 
-		   data_store);
 
-  g_signal_connect(dict, "variables-deleted", 
-		   G_CALLBACK(delete_variables_callback), 
-		   data_store);
 
   /* The entire model has changed */
-  g_sheet_model_range_changed (G_SHEET_MODEL(data_store), -1, -1, -1, -1);
+
+  if ( data_store->dict )
+    for (i = 0 ; i < n_dict_signals; ++i )
+      {
+	if ( data_store->dict_handler_id [i] > 0)
+	  {
+	    g_signal_handler_block (data_store->dict,
+				    data_store->dict_handler_id[i]);
+	  }
+      }
 }
 
 static void
 psppire_data_store_finalize (GObject *object)
 {
+  PsppireDataStore *ds = PSPPIRE_DATA_STORE (object);
+
+  if (ds->datasheet)
+    {
+      datasheet_destroy (ds->datasheet);
+      ds->datasheet = NULL;
+    }
 
   /* must chain up */
   (* parent_class->finalize) (object);
 }
 
 
-static const gchar *
-psppire_data_store_get_string(GSheetModel *model, gint row, gint column)
+static void
+psppire_data_store_dispose (GObject *object)
 {
-  const char *text;
-  const struct fmt_spec *fp ;
-  const struct PsppireVariable *pv ;
-  const union value *v ;
-  GString *s;
-  PsppireDataStore *store = PSPPIRE_DATA_STORE(model);
+  PsppireDataStore *ds = PSPPIRE_DATA_STORE (object);
 
-  g_return_val_if_fail(store->dict, NULL);
-  g_return_val_if_fail(store->cases, NULL);
-
-  if (column >= psppire_dict_get_var_cnt(store->dict))
-    return NULL;
+  if (ds->dispose_has_run)
+    return;
 
-  if ( row >= psppire_case_array_get_n_cases(store->cases))
-    return NULL;
+  psppire_data_store_set_dictionary (ds, NULL);
 
+  /* must chain up */
+  (* parent_class->dispose) (object);
 
-  pv = psppire_dict_get_variable(store->dict, column);
+  ds->dispose_has_run = TRUE;
+}
 
-  v =  psppire_case_array_get_value(store->cases, row, 
-			      psppire_variable_get_index(pv));
 
-  if ( store->show_labels) 
-    {
-      const struct val_labs * vl = psppire_variable_get_value_labels(pv);
 
-      const gchar *label;
-      if ( (label = val_labs_find(vl, *v)) )
-	{
-	  return pspp_locale_to_utf8(label, -1, 0);
-	}
-    }
+/* Insert a blank case before POSN */
+gboolean
+psppire_data_store_insert_new_case (PsppireDataStore *ds, casenumber posn)
+{
+  gboolean result;
+  const struct caseproto *proto;
+  struct ccase *cc;
+  g_return_val_if_fail (ds, FALSE);
 
-  fp = psppire_variable_get_write_spec(pv);
+  proto = datasheet_get_proto (ds->datasheet);
+  g_return_val_if_fail (caseproto_get_n_widths (proto) > 0, FALSE);
+  g_return_val_if_fail (posn <= psppire_data_store_get_case_count (ds), FALSE);
 
-  s = g_string_sized_new (fp->w + 1);
-  g_string_set_size(s, fp->w);
-  
-  memset(s->str, 0, fp->w);
+  cc = case_create (proto);
+  case_set_missing (cc);
 
-  g_assert(fp->w == s->len);
-    
-  /* Converts binary value V into printable form in the exactly
-     FP->W character in buffer S according to format specification
-     FP.  No null terminator is appended to the buffer.  */
-  data_out (s->str, fp, v);
+  result = psppire_data_store_insert_case (ds, cc, posn);
 
-  
-  text = pspp_locale_to_utf8(s->str, fp->w, 0);
-  g_string_free(s, TRUE);
+  case_unref (cc);
 
-  return text;
+  return result;
 }
 
-
-static gboolean
-set_null_string_value(union value *val, gpointer data)
+gboolean
+psppire_data_store_get_value (PsppireDataStore *store,
+			      glong row, const struct variable *var,
+			      union value *val)
 {
-  strcpy(val->s, "");
-  return TRUE;
-}
+  g_return_val_if_fail (store != NULL, FALSE);
+  g_return_val_if_fail (store->datasheet != NULL, FALSE);
+  g_return_val_if_fail (var != NULL, FALSE);
 
-static gboolean
-set_sysmis_value(union value *val, gpointer data)
-{
-  val->f = SYSMIS;
-  return TRUE;
-}
-
-
-static gboolean 
-psppire_data_store_clear_datum(GSheetModel *model, 
-					  gint row, gint col)
-
-{
-  PsppireDataStore *store = PSPPIRE_DATA_STORE(model);
-
-  const struct PsppireVariable *pv = psppire_dict_get_variable(store->dict, col);
+  if (row < 0 || row >= datasheet_get_n_rows (store->datasheet))
+    return FALSE;
 
-  const gint index = psppire_variable_get_index(pv) ;
+  int width = var_get_width (var);
+  value_init (val, width);
+  datasheet_get_value (store->datasheet, row, var_get_case_index (var), val);
 
-  if ( psppire_variable_get_type(pv) == NUMERIC) 
-    psppire_case_array_set_value(store->cases, row, index, set_sysmis_value,0);
-  else
-    psppire_case_array_set_value(store->cases, row, index, set_null_string_value,0);
   return TRUE;
 }
 
 
-static gboolean
-fillit(union value *val, gpointer data)
-{
-  struct data_in *d_in = data;
 
-  d_in->v = val;
+gchar *
+psppire_data_store_get_string (PsppireDataStore *store,
+                               glong row, const struct variable *var,
+                               bool use_value_label)
+{
+  gchar *string;
+  union value v;
+  int width = var_get_width (var);
+  if (! psppire_data_store_get_value (store, row, var, &v))
+    return NULL;
 
-  if ( ! data_in(d_in) ) 
+  string = NULL;
+  if (use_value_label)
     {
-      g_warning("Cant encode string\n");
-      return FALSE;
+      const char *label = var_lookup_value_label (var, &v);
+      if (label != NULL)
+        string = g_strdup (label);
     }
+  if (string == NULL)
+    string = value_to_text (v, var);
 
-  return TRUE;
+  value_destroy (&v, width);
+
+  return string;
 }
 
 
-/* Attempts to update that part of the variable store which corresponds 
-   to ROW, COL with  the value TEXT.
-   Returns true if anything was updated, false otherwise.
-*/
-static gboolean 
-psppire_data_store_set_string(GSheetModel *model, 
-			  const gchar *text, gint row, gint col)
+/* Attempts to update that part of the variable store which corresponds to VAR
+   within ROW with the value TEXT.
+
+   If USE_VALUE_LABEL is true, and TEXT is a value label for the column's
+   variable, then stores the value from that value label instead of the literal
+   TEXT.
+
+   Returns true if anything was updated, false otherwise.  */
+gboolean
+psppire_data_store_set_string (PsppireDataStore *store,
+			       const gchar *text,
+                               glong row, const struct variable *var,
+                               gboolean use_value_label)
 {
-  gint r;
-  PsppireDataStore *store = PSPPIRE_DATA_STORE(model);
+  gint case_index;
+  glong n_cases;
+  gboolean ok;
 
-  const struct PsppireVariable *pv = psppire_dict_get_variable(store->dict, col);
-  g_return_val_if_fail(pv, FALSE);
+  n_cases = psppire_data_store_get_case_count (store);
+  if (row > n_cases)
+    return FALSE;
+  if (row == n_cases)
+    psppire_data_store_insert_new_case (store, row);
 
-  for(r = psppire_case_array_get_n_cases(store->cases) ; r <= row ; ++r ) 
+  case_index = var_get_case_index (var);
+  if (use_value_label)
     {
-      gint c;
-      psppire_case_array_insert_case(store->cases, r, 0, 0);
-
-      for (c = 0 ; c < psppire_dict_get_var_cnt(store->dict); ++c ) 
-	psppire_data_store_clear_datum(model, r, c);
+      const struct val_labs *vls = var_get_value_labels (var);
+      const union value *value = vls ? val_labs_find_value (vls, text) : NULL;
+      if (value)
+        ok = datasheet_put_value (store->datasheet, row, case_index, value);
+      else
+        ok = FALSE;
     }
+  else
+    ok = psppire_data_store_data_in (store, row, case_index, ss_cstr (text),
+                                     var_get_print_format (var));
 
-  {
-    const gint index = psppire_variable_get_index(pv);
-
-    struct data_in d_in;
-    d_in.s = text;
-    d_in.e = text + strlen(text);
-    d_in.v = 0;
-    d_in.f1 = d_in.f2 = 0;
-    d_in.format = * psppire_variable_get_write_spec(pv);
-    d_in.flags = 0;
-
-    psppire_case_array_set_value(store->cases, row, index, fillit, &d_in);
-  }
-
-  return TRUE;
+  if (ok)
+    g_signal_emit (store, signals [CASE_CHANGED], 0, row);
+  return ok;
 }
 
 
-void
-psppire_data_store_set_font(PsppireDataStore *store, PangoFontDescription *fd)
-{
-  g_return_if_fail (store);
-  g_return_if_fail (PSPPIRE_IS_DATA_STORE (store));
-
-  store->font_desc = fd;
-  g_sheet_model_range_changed (G_SHEET_MODEL(store),
-				 -1, -1, -1, -1);
-}
-
 
 void
-psppire_data_store_show_labels(PsppireDataStore *store, gboolean show_labels)
+psppire_data_store_clear (PsppireDataStore *ds)
 {
-  g_return_if_fail (store);
-  g_return_if_fail (PSPPIRE_IS_DATA_STORE (store));
+  datasheet_destroy (ds->datasheet);
+  ds->datasheet = NULL;
 
-  store->show_labels = show_labels;
+  psppire_dict_clear (ds->dict);
 
-  g_sheet_model_range_changed (G_SHEET_MODEL(store),
-				 -1, -1, -1, -1);
+  g_signal_emit (ds, signals [ITEMS_CHANGED], 0, 0, -1, 0);
 }
 
 
 
-static gboolean 
-write_case(const struct ccase *cc, 
-	   gpointer aux)
+/* Return a casereader made from this datastore */
+struct casereader *
+psppire_data_store_get_reader (PsppireDataStore *ds)
 {
-  struct sfm_writer *writer = aux;
+  int i;
+  struct casereader *reader ;
 
-  if ( ! sfm_write_case(writer, cc) )
-    return FALSE;
+  if ( ds->dict )
+    for (i = 0 ; i < n_dict_signals; ++i )
+      {
+	g_signal_handler_block (ds->dict,
+				ds->dict_handler_id[i]);
+      }
 
+  reader = datasheet_make_reader (ds->datasheet);
 
-  return TRUE;
+  /* We must not reference this again */
+  ds->datasheet = NULL;
+
+  return reader;
 }
 
-void
-psppire_data_store_create_system_file(PsppireDataStore *store,
-			      struct file_handle *handle)
+/* Returns the CASENUMth case, or a null pointer on failure.
+ */
+struct ccase *
+psppire_data_store_get_case (const PsppireDataStore *ds,
+			     casenumber casenum)
 {
-  const struct sfm_write_options wo = {
-    true, /* writeable */
-    false, /* dont compress */
-    3 /* version */
-  }; 
-
-  struct sfm_writer *writer ;
-
-  g_assert(handle);
-
-  writer = sfm_open_writer(handle, store->dict->dict, wo);
+  g_return_val_if_fail (ds, FALSE);
+  g_return_val_if_fail (ds->datasheet, FALSE);
 
-  if ( ! writer) 
-    return;
+  return datasheet_get_row (ds->datasheet, casenum);
+}
 
-  psppire_case_array_iterate_case(store->cases, write_case, writer);
 
-  sfm_close_writer(writer);
-}
+gboolean
+psppire_data_store_delete_cases (PsppireDataStore *ds, casenumber first,
+				 casenumber n_cases)
+{
+  g_return_val_if_fail (ds, FALSE);
+  g_return_val_if_fail (ds->datasheet, FALSE);
 
+  g_return_val_if_fail (first + n_cases <=
+			psppire_data_store_get_case_count (ds), FALSE);
 
 
-/* Column related funcs */
+  datasheet_delete_rows (ds->datasheet, first, n_cases);
 
-static gint
-geometry_get_column_count(const GSheetColumn *geom)
-{
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
+  g_signal_emit (ds, signals[ITEMS_CHANGED], 0, first, n_cases, 0);
 
-  return MAX(MIN_COLUMNS, psppire_dict_get_var_cnt(ds->dict));
+  return TRUE;
 }
 
-/* Return the width that an  'M' character would occupy when typeset at
-   row, col */
-static guint 
-M_width(GtkSheet *sheet, gint row, gint col)
-{
-  GtkSheetCellAttr attributes;
-  PangoRectangle rect;
-  /* FIXME: make this a member of the data store */
-  static PangoLayout *layout = 0;
 
-  gtk_sheet_get_attributes(sheet, row, col, &attributes);
 
-  if (! layout ) 
-    layout = gtk_widget_create_pango_layout (GTK_WIDGET(sheet), "M");
+/* Insert case CC into the case file before POSN */
+static gboolean
+psppire_data_store_insert_case (PsppireDataStore *ds,
+				struct ccase *cc,
+				casenumber posn)
+{
+  bool result ;
 
-  g_assert(layout);
-  
-  pango_layout_set_font_description (layout, 
-				     attributes.font_desc);
+  g_return_val_if_fail (ds, FALSE);
+  g_return_val_if_fail (ds->datasheet, FALSE);
 
-  pango_layout_get_extents (layout, NULL, &rect);
+  cc = case_ref (cc);
+  result = datasheet_insert_rows (ds->datasheet, posn, &cc, 1);
 
-#if 0
-  g_object_unref(G_OBJECT(layout));
-#endif
+  if ( result )
+    {
+      g_signal_emit (ds, signals[ITEMS_CHANGED], 0, posn, 0, 1);
+    }
+  else
+    g_warning ("Cannot insert case at position %ld\n", posn);
 
-  return PANGO_PIXELS(rect.width);
+  return result;
 }
 
 
-/* Return the number of pixels corresponding to a column of 
-   WIDTH characters */
-static inline guint 
-columnWidthToPixels(GtkSheet *sheet, gint column, guint width)
+/* Set the value of VAR in case CASENUM to V.
+   V must be the correct width for IDX.
+   Returns true if successful, false on I/O error. */
+gboolean
+psppire_data_store_set_value (PsppireDataStore *ds, casenumber casenum,
+			      const struct variable *var, const union value *v)
 {
-  return (M_width(sheet, 0, column) * width);
-}
+  glong n_cases;
+  bool ok;
 
+  g_return_val_if_fail (ds, FALSE);
+  g_return_val_if_fail (ds->datasheet, FALSE);
 
-static gint
-geometry_get_width(const GSheetColumn *geom, gint unit, GtkSheet *sheet)
-{
-  const struct PsppireVariable *pv ;
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
+  n_cases = psppire_data_store_get_case_count (ds);
+  if ( casenum > n_cases)
+    return FALSE;
 
-  if ( unit >= psppire_dict_get_var_cnt(ds->dict) )
-    return 75;
+  if (casenum == n_cases)
+    psppire_data_store_insert_new_case (ds, casenum);
 
-  /* FIXME: We can optimise this by caching the widths until they're resized */
-  pv = psppire_dict_get_variable(ds->dict, unit);
+  ok = datasheet_put_value (ds->datasheet, casenum, var_get_case_index (var),
+                            v);
+  if (ok)
+    {
+      g_signal_emit (ds, signals [CASE_CHANGED], 0, casenum);
+      g_signal_emit (ds, signals [ITEMS_CHANGED], 0, casenum, 1, 1);
+    }
 
-  return columnWidthToPixels(sheet, unit, psppire_variable_get_columns(pv));
+  return ok;
 }
 
 
 
 
-static void
-geometry_set_width(GSheetColumn *geom, gint unit, gint width, GtkSheet *sheet)
+/* Set the IDXth value of case C using D_IN */
+static gboolean
+psppire_data_store_data_in (PsppireDataStore *ds, casenumber casenum, gint idx,
+			    struct substring input, const struct fmt_spec *fmt)
 {
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
-
-  struct PsppireVariable *pv = psppire_dict_get_variable(ds->dict, unit);
+  union value value;
+  int width;
+  bool ok;
 
-  psppire_variable_set_columns(pv, width / M_width(sheet, 1, unit));
-}
+  PsppireDict *dict;
 
+  g_return_val_if_fail (ds, FALSE);
+  g_return_val_if_fail (ds->datasheet, FALSE);
 
+  g_return_val_if_fail (idx < datasheet_get_n_columns (ds->datasheet), FALSE);
 
-static GtkJustification
-geometry_get_justification(const GSheetColumn *geom, gint unit)
-{
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
-  const struct PsppireVariable *pv ;
+  dict = ds->dict;
 
+  width = fmt_var_width (fmt);
+  g_return_val_if_fail (caseproto_get_width (
+                          datasheet_get_proto (ds->datasheet), idx) == width,
+                        FALSE);
+  value_init (&value, width);
+  ok = (datasheet_get_value (ds->datasheet, casenum, idx, &value)
+        && data_in_msg (input, UTF8, fmt->type, &value, width,
+                        dict_get_encoding (dict->dict))
+        && datasheet_put_value (ds->datasheet, casenum, idx, &value));
+  value_destroy (&value, width);
 
-  if ( unit >= psppire_dict_get_var_cnt(ds->dict) )
-    return GTK_JUSTIFY_LEFT;
-
-  pv = psppire_dict_get_variable(ds->dict, unit);
-
-  /* Kludge: Happily GtkJustification is defined similarly
-     to enum alignment from pspp/variable.h */
-  return psppire_variable_get_alignment(pv);
+  return ok;
 }
 
-
-static const gchar null_var_name[]=_("var");
- 
-static const gchar *
-geometry_get_button_label(const GSheetColumn *geom, gint unit)
+/* Resize the cases in the casefile, by inserting a value of the
+   given WIDTH into every one of them at the position immediately
+   preceding WHERE.
+*/
+gboolean
+psppire_data_store_insert_value (PsppireDataStore *ds,
+                                 gint width, gint where)
 {
-  const gchar *text;
-  struct PsppireVariable *pv ;
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
+  union value value;
 
-  if ( unit >= psppire_dict_get_var_cnt(ds->dict) )
-    return pspp_locale_to_utf8(null_var_name, -1, 0);
+  g_return_val_if_fail (ds, FALSE);
 
-  pv = psppire_dict_get_variable(ds->dict, unit);
+  g_assert (width >= 0);
 
-  text =  pspp_locale_to_utf8(psppire_variable_get_name(pv), -1, 0);
+  if ( ! ds->datasheet )
+    ds->datasheet = datasheet_create (NULL);
 
-  return text;
-}
+  value_init (&value, width);
+  value_set_missing (&value, width);
 
+  datasheet_insert_column (ds->datasheet, &value, width, where);
+  value_destroy (&value, width);
 
-static gboolean
-geometry_get_sensitivity(const GSheetColumn *geom, gint unit)
+  return TRUE;
+}
+
+gboolean
+psppire_data_store_filtered (PsppireDataStore *ds,
+                             glong row)
 {
-  PsppireDataStore *ds = PSPPIRE_DATA_STORE(geom);
+  union value val;
 
+  const struct dictionary *dict;
+  const struct variable *filter;
 
-  return (unit < psppire_dict_get_var_cnt(ds->dict));
-}
+  if ( row < 0 || row >= datasheet_get_n_rows (ds->datasheet))
+    return FALSE;
 
+  dict = ds->dict->dict;
+  g_return_val_if_fail (dict, FALSE);
+  filter = dict_get_filter (dict);
+  if ( ! filter)
+    return FALSE;
 
-static void
-psppire_data_store_sheet_column_init (GSheetColumnIface *iface)
-{
-  iface->get_column_count = geometry_get_column_count;
-  iface->get_width = geometry_get_width;
-  iface->set_width = geometry_set_width;
-  iface->get_visibility = always_true;
-  iface->get_sensitivity = geometry_get_sensitivity;
-  iface->get_justification = geometry_get_justification;
+  g_return_val_if_fail (var_is_numeric (filter), FALSE);
+  value_init (&val, 0);
+  if ( ! datasheet_get_value (ds->datasheet, row,
+                              var_get_case_index (filter),
+                              &val) )
+    return FALSE;
 
-  iface->get_button_label = geometry_get_button_label;
+  return (val.f == 0.0);
 }