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[gtk+/treeview-refactor] Added tests to reflect proper treatment of background area.

commit 51b75ef44b5d6176d8f683652be93652b6568fe7
Author: Tristan Van Berkom <tristan van berkom gmail com>
Date:   Fri Nov 12 21:55:28 2010 +0900

    Added tests to reflect proper treatment of background area.
    
    CellAreaScaffold now also reflects how cell_area should be
    passed to gtk_cell_area_activate() and gtk_cell_area_event()
    and how the background area for gtk_cell_area_renderer() should
    be created.

 gtk/gtkcellarea.c        |    8 +-
 tests/cellareascaffold.c |  177 ++++++++++++++++++++++++++++++++++++++-----
 tests/cellareascaffold.h |   22 ++++--
 tests/testcellarea.c     |  191 +++++++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 368 insertions(+), 30 deletions(-)
---
diff --git a/gtk/gtkcellarea.c b/gtk/gtkcellarea.c
index 7427254..5dbc602 100644
--- a/gtk/gtkcellarea.c
+++ b/gtk/gtkcellarea.c
@@ -2359,7 +2359,7 @@ gtk_cell_area_set_cell_margin_left (GtkCellArea *area,
     {
       priv->cell_border.left = margin;
 
-      g_object_notify (G_OBJECT (area), "margin-left");
+      g_object_notify (G_OBJECT (area), "cell-margin-left");
     }
 }
 
@@ -2385,7 +2385,7 @@ gtk_cell_area_set_cell_margin_right (GtkCellArea *area,
     {
       priv->cell_border.right = margin;
 
-      g_object_notify (G_OBJECT (area), "margin-right");
+      g_object_notify (G_OBJECT (area), "cell-margin-right");
     }
 }
 
@@ -2411,7 +2411,7 @@ gtk_cell_area_set_cell_margin_top (GtkCellArea *area,
     {
       priv->cell_border.top = margin;
 
-      g_object_notify (G_OBJECT (area), "margin-top");
+      g_object_notify (G_OBJECT (area), "cell-margin-top");
     }
 }
 
@@ -2437,7 +2437,7 @@ gtk_cell_area_set_cell_margin_bottom (GtkCellArea *area,
     {
       priv->cell_border.bottom = margin;
 
-      g_object_notify (G_OBJECT (area), "margin-bottom");
+      g_object_notify (G_OBJECT (area), "cell-margin-bottom");
     }
 }
 
diff --git a/tests/cellareascaffold.c b/tests/cellareascaffold.c
index 66750b0..32a07e1 100644
--- a/tests/cellareascaffold.c
+++ b/tests/cellareascaffold.c
@@ -152,6 +152,10 @@ struct _CellAreaScaffoldPrivate {
   GdkRectangle     edit_rect;
   gulong           editing_started_id;
   gulong           remove_editable_id;
+
+
+  gint             row_spacing;
+  gint             indent;
 };
 
 enum {
@@ -166,8 +170,6 @@ enum {
 
 static guint scaffold_signals[N_SIGNALS] = { 0 };
 
-#define ROW_SPACING  2
-
 #define DIRECTION_STR(dir)				\
   ((dir) == GTK_DIR_TAB_FORWARD  ? "tab forward" :	\
    (dir) == GTK_DIR_TAB_BACKWARD ? "tab backward" :	\
@@ -213,8 +215,6 @@ cell_area_scaffold_init (CellAreaScaffold *scaffold)
   priv->remove_editable_id =
     g_signal_connect (priv->area, "remove-editable",
 		      G_CALLBACK (remove_editable_cb), scaffold);
-
-
 }
 
 static void
@@ -429,6 +429,7 @@ cell_area_scaffold_draw (GtkWidget       *widget,
   GtkOrientation           orientation;
   GtkTreeIter              iter;
   gboolean                 valid;
+  GdkRectangle             background_area;
   GdkRectangle             render_area;
   GtkAllocation            allocation;
   gint                     i = 0;
@@ -448,6 +449,19 @@ cell_area_scaffold_draw (GtkWidget       *widget,
   render_area.width  = allocation.width;
   render_area.height = allocation.height;
 
+  background_area = render_area;
+
+  if (orientation == GTK_ORIENTATION_HORIZONTAL)
+    {
+      render_area.x      = priv->indent;
+      render_area.width -= priv->indent;
+    }
+  else
+    {
+      render_area.y       = priv->indent;
+      render_area.height -= priv->indent;
+    }
+
   valid = gtk_tree_model_get_iter_first (priv->model, &iter);
   while (valid)
     {
@@ -460,27 +474,65 @@ cell_area_scaffold_draw (GtkWidget       *widget,
 
       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 	{
-	  render_area.height = data->size;
+	  render_area.height     = data->size;
+
+	  background_area.height = render_area.height;
+	  background_area.y      = render_area.y;
+
+	  if (i == 0)
+	    {
+	      background_area.height += priv->row_spacing / 2;
+	      background_area.height += priv->row_spacing % 2;
+	    }
+	  else if (i == priv->row_data->len - 1)
+	    {
+	      background_area.y      -= priv->row_spacing / 2;
+	      background_area.height += priv->row_spacing / 2;
+	    }
+	  else
+	    {
+	      background_area.y      -= priv->row_spacing / 2;
+	      background_area.height += priv->row_spacing;
+	    }
 	}
-      else
+      else /* GTK_ORIENTATION_VERTICAL */
 	{
-	  render_area.width = data->size;
+	  render_area.width     = data->size;
+
+	  background_area.width = render_area.height;
+	  background_area.x     = render_area.x;
+
+	  if (i == 0)
+	    {
+	      background_area.width += priv->row_spacing / 2;
+	      background_area.width += priv->row_spacing % 2;
+	    }
+	  else if (i == priv->row_data->len - 1)
+	    {
+	      background_area.x     -= priv->row_spacing / 2;
+	      background_area.width += priv->row_spacing / 2;
+	    }
+	  else
+	    {
+	      background_area.x     -= priv->row_spacing / 2;
+	      background_area.width += priv->row_spacing;
+	    }
 	}
 
       gtk_cell_area_apply_attributes (priv->area, priv->model, &iter, FALSE, FALSE);
       gtk_cell_area_render (priv->area, priv->iter, widget, cr, 
-			    &render_area, &render_area, flags,
+			    &background_area, &render_area, flags,
 			    (have_focus && i == priv->focus_row));
 
       if (orientation == GTK_ORIENTATION_HORIZONTAL)
 	{
 	  render_area.y += data->size;
-	  render_area.y += ROW_SPACING;
+	  render_area.y += priv->row_spacing;
 	}
       else
 	{
 	  render_area.x += data->size;
-	  render_area.x += ROW_SPACING;
+	  render_area.x += priv->row_spacing;
 	}
 
       i++;
@@ -627,6 +679,9 @@ cell_area_scaffold_get_preferred_width (GtkWidget       *widget,
       request_all_base (scaffold);
 
       gtk_cell_area_iter_get_preferred_width (priv->iter, minimum_size, natural_size);
+
+      *minimum_size += priv->indent;
+      *natural_size += priv->indent;
     }
   else
     {
@@ -666,7 +721,7 @@ cell_area_scaffold_get_preferred_height_for_width (GtkWidget       *widget,
       memset (request_array->data, 0x0, n_rows * sizeof (RowData));
 
       /* Gather each contextual size into the request array */
-      get_row_sizes (scaffold, request_array, for_size);
+      get_row_sizes (scaffold, request_array, for_size - priv->indent);
 
       /* Sum up the size and add some row spacing */
       for (i = 0; i < n_rows; i++)
@@ -676,7 +731,7 @@ cell_area_scaffold_get_preferred_height_for_width (GtkWidget       *widget,
 	  full_size += data->size;
 	}
 
-      full_size += MAX (0, n_rows -1) * ROW_SPACING;
+      full_size += MAX (0, n_rows -1) * priv->row_spacing;
 
       g_array_free (request_array, TRUE);
 
@@ -708,6 +763,9 @@ cell_area_scaffold_get_preferred_height (GtkWidget       *widget,
       request_all_base (scaffold);
 
       gtk_cell_area_iter_get_preferred_height (priv->iter, minimum_size, natural_size);
+
+      *minimum_size += priv->indent;
+      *natural_size += priv->indent;
     }
   else
     {
@@ -747,7 +805,7 @@ cell_area_scaffold_get_preferred_width_for_height (GtkWidget       *widget,
       memset (request_array->data, 0x0, n_rows * sizeof (RowData));
 
       /* Gather each contextual size into the request array */
-      get_row_sizes (scaffold, request_array, for_size);
+      get_row_sizes (scaffold, request_array, for_size - priv->indent);
 
       /* Sum up the size and add some row spacing */
       for (i = 0; i < n_rows; i++)
@@ -757,7 +815,7 @@ cell_area_scaffold_get_preferred_width_for_height (GtkWidget       *widget,
 	  full_size += data->size;
 	}
 
-      full_size += MAX (0, n_rows -1) * ROW_SPACING;
+      full_size += MAX (0, n_rows -1) * priv->row_spacing;
 
       g_array_free (request_array, TRUE);
 
@@ -934,6 +992,17 @@ cell_area_scaffold_button_press (GtkWidget       *widget,
   event_area.width  = allocation.width;
   event_area.height = allocation.height;
 
+  if (orientation == GTK_ORIENTATION_HORIZONTAL)
+    {
+      event_area.x      = priv->indent;
+      event_area.width -= priv->indent;
+    }
+  else
+    {
+      event_area.y       = priv->indent;
+      event_area.height -= priv->indent;
+    }
+
   valid = gtk_tree_model_get_iter_first (priv->model, &iter);
   while (valid)
     {
@@ -954,7 +1023,7 @@ cell_area_scaffold_button_press (GtkWidget       *widget,
 	    }
 
 	  event_area.y += data->size;
-	  event_area.y += ROW_SPACING;
+	  event_area.y += priv->row_spacing;
 	}
       else
 	{
@@ -971,7 +1040,7 @@ cell_area_scaffold_button_press (GtkWidget       *widget,
 	    }
 
 	  event_area.x += data->size;
-	  event_area.x += ROW_SPACING;
+	  event_area.x += priv->row_spacing;
 	}
 
       i++;
@@ -1053,6 +1122,17 @@ cell_area_scaffold_activate (CellAreaScaffold *scaffold)
   cell_area.width  = allocation.width;
   cell_area.height = allocation.height;
 
+  if (orientation == GTK_ORIENTATION_HORIZONTAL)
+    {
+      cell_area.x      = priv->indent;
+      cell_area.width -= priv->indent;
+    }
+  else
+    {
+      cell_area.y       = priv->indent;
+      cell_area.height -= priv->indent;
+    }
+
   valid = gtk_tree_model_get_iter_first (priv->model, &iter);
   while (valid)
     {
@@ -1072,9 +1152,9 @@ cell_area_scaffold_activate (CellAreaScaffold *scaffold)
 	}
 
       if (orientation == GTK_ORIENTATION_HORIZONTAL)
-	cell_area.y += data->size + ROW_SPACING;
+	cell_area.y += data->size + priv->row_spacing;
       else
-	cell_area.x += data->size + ROW_SPACING;
+	cell_area.x += data->size + priv->row_spacing;
 
       i++;
       valid = gtk_tree_model_iter_next (priv->model, &iter);
@@ -1298,3 +1378,64 @@ cell_area_scaffold_get_model (CellAreaScaffold *scaffold)
 
   return priv->model;
 }
+
+
+void
+cell_area_scaffold_set_row_spacing (CellAreaScaffold *scaffold,
+				    gint              spacing)
+{
+  CellAreaScaffoldPrivate *priv;
+  
+  g_return_if_fail (IS_CELL_AREA_SCAFFOLD (scaffold));
+
+  priv = scaffold->priv;
+
+  if (priv->row_spacing != spacing)
+    {
+      priv->row_spacing = spacing;
+      gtk_widget_queue_resize (GTK_WIDGET (scaffold));
+    }
+}
+
+gint
+cell_area_scaffold_get_row_spacing (CellAreaScaffold *scaffold)
+{
+  CellAreaScaffoldPrivate *priv;
+  
+  g_return_val_if_fail (IS_CELL_AREA_SCAFFOLD (scaffold), 0);
+
+  priv = scaffold->priv;
+
+  return priv->row_spacing;
+}
+
+void
+cell_area_scaffold_set_indentation (CellAreaScaffold *scaffold,
+				    gint              indent)
+{
+  CellAreaScaffoldPrivate *priv;
+  
+  g_return_if_fail (IS_CELL_AREA_SCAFFOLD (scaffold));
+
+  priv = scaffold->priv;
+
+  if (priv->indent != indent)
+    {
+      priv->indent = indent;
+      gtk_widget_queue_resize (GTK_WIDGET (scaffold));
+    }
+}
+
+gint
+cell_area_scaffold_get_indentation (CellAreaScaffold *scaffold)
+{
+  CellAreaScaffoldPrivate *priv;
+  
+  g_return_val_if_fail (IS_CELL_AREA_SCAFFOLD (scaffold), 0);
+
+  priv = scaffold->priv;
+
+  return priv->indent;
+}
+
+
diff --git a/tests/cellareascaffold.h b/tests/cellareascaffold.h
index cf9fa06..cdc7b25 100644
--- a/tests/cellareascaffold.h
+++ b/tests/cellareascaffold.h
@@ -56,13 +56,23 @@ struct _CellAreaScaffoldClass
 };
 
 
-GType         cell_area_scaffold_get_type   (void) G_GNUC_CONST;
-GtkWidget    *cell_area_scaffold_new        (void);
+GType         cell_area_scaffold_get_type              (void) G_GNUC_CONST;
+GtkWidget    *cell_area_scaffold_new                   (void);
+
+GtkCellArea  *cell_area_scaffold_get_area              (CellAreaScaffold *scaffold);
+void          cell_area_scaffold_set_model             (CellAreaScaffold *scaffold,
+							GtkTreeModel     *model);
+GtkTreeModel *cell_area_scaffold_get_model             (CellAreaScaffold *scaffold);
+
+void          cell_area_scaffold_set_row_spacing       (CellAreaScaffold *scaffold,
+							gint              spacing);
+gint          cell_area_scaffold_get_row_spacing       (CellAreaScaffold *scaffold);
+
+void          cell_area_scaffold_set_indentation       (CellAreaScaffold *scaffold,
+							gint              indent);
+gint          cell_area_scaffold_get_indentation       (CellAreaScaffold *scaffold);
+
 
-GtkCellArea  *cell_area_scaffold_get_area   (CellAreaScaffold *scaffold);
-void          cell_area_scaffold_set_model  (CellAreaScaffold *scaffold,
-					     GtkTreeModel     *model);
-GtkTreeModel *cell_area_scaffold_get_model  (CellAreaScaffold *scaffold);
 
 G_END_DECLS
 
diff --git a/tests/testcellarea.c b/tests/testcellarea.c
index c9e478e..0be88c7 100644
--- a/tests/testcellarea.c
+++ b/tests/testcellarea.c
@@ -168,6 +168,8 @@ simple_cell_area (void)
 
   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
 
+  gtk_window_set_title (GTK_WINDOW (window), "CellArea expand and alignments");
+
   scaffold = simple_scaffold ();
 
   hbox  = gtk_hbox_new (FALSE, 4);
@@ -325,7 +327,7 @@ cell_edited (GtkCellRendererToggle *cell_renderer,
 }
 
 static GtkWidget *
-focus_scaffold (void)
+focus_scaffold (gboolean color_bg)
 {
   GtkTreeModel *model;
   GtkWidget *scaffold;
@@ -346,6 +348,9 @@ focus_scaffold (void)
   gtk_cell_area_box_pack_start (GTK_CELL_AREA_BOX (area), renderer, TRUE, FALSE);
   gtk_cell_area_attribute_connect (area, renderer, "text", FOCUS_COLUMN_NAME);
 
+  if (color_bg)
+    g_object_set (G_OBJECT (renderer), "cell-background", "red", NULL);
+
   g_signal_connect (G_OBJECT (renderer), "edited",
 		    G_CALLBACK (cell_edited), scaffold);
 
@@ -354,6 +359,9 @@ focus_scaffold (void)
   gtk_cell_area_box_pack_start (GTK_CELL_AREA_BOX (area), renderer, FALSE, TRUE);
   gtk_cell_area_attribute_connect (area, renderer, "active", FOCUS_COLUMN_CHECK);
 
+  if (color_bg)
+    g_object_set (G_OBJECT (renderer), "cell-background", "green", NULL);
+
   g_signal_connect (G_OBJECT (renderer), "toggled",
 		    G_CALLBACK (cell_toggled), scaffold);
 
@@ -362,9 +370,15 @@ focus_scaffold (void)
 		"wrap-mode", PANGO_WRAP_WORD,
 		"wrap-width", 150,
 		NULL);
+
+  if (color_bg)
+    g_object_set (G_OBJECT (renderer), "cell-background", "blue", NULL);
+
   gtk_cell_area_box_pack_start (GTK_CELL_AREA_BOX (area), renderer, FALSE, TRUE);
   gtk_cell_area_attribute_connect (area, renderer, "text", FOCUS_COLUMN_STATIC_TEXT);
 
+  gtk_cell_area_add_focus_sibling (area, focus_renderer, sibling_renderer);
+
   return scaffold;
 }
 
@@ -394,7 +408,9 @@ focus_cell_area (void)
   hbox  = gtk_hbox_new (FALSE, 4);
   gtk_widget_show (hbox);
 
-  scaffold = focus_scaffold ();
+  gtk_window_set_title (GTK_WINDOW (window), "Focus and editable cells");
+
+  scaffold = focus_scaffold (FALSE);
 
   frame = gtk_frame_new (NULL);
   gtk_widget_show (frame);
@@ -422,6 +438,7 @@ focus_cell_area (void)
                     G_CALLBACK (orientation_changed), scaffold);
 
   widget = gtk_check_button_new_with_label ("Focus Sibling");
+  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (widget), TRUE);
   gtk_widget_show (widget);
   gtk_box_pack_start (GTK_BOX (vbox), widget, FALSE, FALSE, 0);
 
@@ -434,6 +451,175 @@ focus_cell_area (void)
 }
 
 
+
+/*******************************************************
+ *                  Background Area                    *
+ *******************************************************/
+static void
+cell_spacing_changed (GtkSpinButton    *spin_button,
+		      CellAreaScaffold *scaffold)
+{
+  GtkCellArea *area = cell_area_scaffold_get_area (scaffold);
+  gint        value;
+
+  value = (gint)gtk_spin_button_get_value (spin_button);
+
+  gtk_cell_area_box_set_spacing (GTK_CELL_AREA_BOX (area), value);
+}
+
+static void
+row_spacing_changed (GtkSpinButton    *spin_button,
+		     CellAreaScaffold *scaffold)
+{
+  gint value;
+
+  value = (gint)gtk_spin_button_get_value (spin_button);
+
+  cell_area_scaffold_set_row_spacing (scaffold, value);
+}
+
+static void
+cell_margins_changed (GtkSpinButton    *spin_button,
+		      CellAreaScaffold *scaffold)
+{
+  GtkCellArea *area = cell_area_scaffold_get_area (scaffold);
+  gint        value;
+
+  value = (gint)gtk_spin_button_get_value (spin_button);
+
+  gtk_cell_area_set_cell_margin_left (area, value);
+  gtk_cell_area_set_cell_margin_right (area, value);
+  gtk_cell_area_set_cell_margin_top (area, value);
+  gtk_cell_area_set_cell_margin_bottom (area, value);
+
+  gtk_widget_queue_resize (GTK_WIDGET (scaffold));
+}
+
+
+static void
+indentation_changed (GtkSpinButton    *spin_button,
+		     CellAreaScaffold *scaffold)
+{
+  gint value;
+
+  value = (gint)gtk_spin_button_get_value (spin_button);
+
+  cell_area_scaffold_set_indentation (scaffold, value);
+}
+
+static void
+background_area (void)
+{
+  GtkWidget *window, *widget, *label, *main_vbox;
+  GtkWidget *scaffold, *frame, *vbox, *hbox;
+
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+  hbox  = gtk_hbox_new (FALSE, 4);
+  main_vbox  = gtk_vbox_new (FALSE, 4);
+  gtk_widget_show (hbox);
+  gtk_widget_show (main_vbox);
+  gtk_container_add (GTK_CONTAINER (window), main_vbox);
+
+  gtk_window_set_title (GTK_WINDOW (window), "Background Area");
+
+  label = gtk_label_new ("In this example, row spacing gets devided into the background area, "
+			 "column spacing is added between each background area, indentation is "
+			 "prepended space distributed to the background area, individual cell margins "
+			 "are also distributed to the background area for every cell.");
+  gtk_label_set_line_wrap  (GTK_LABEL (label), TRUE);
+  gtk_label_set_width_chars  (GTK_LABEL (label), 40);
+  gtk_widget_show (label);
+  gtk_box_pack_start (GTK_BOX (main_vbox), label, FALSE, FALSE, 0);
+
+  scaffold = focus_scaffold (TRUE);
+
+  frame = gtk_frame_new (NULL);
+  gtk_widget_show (frame);
+
+  gtk_widget_set_valign (frame, GTK_ALIGN_CENTER);
+  gtk_widget_set_halign (frame, GTK_ALIGN_FILL);
+
+  gtk_container_add (GTK_CONTAINER (frame), scaffold);
+
+  gtk_box_pack_end (GTK_BOX (hbox), frame, TRUE, TRUE, 0);
+
+  /* Now add some controls */
+  vbox  = gtk_vbox_new (FALSE, 4);
+  gtk_widget_show (vbox);
+  gtk_box_pack_end (GTK_BOX (hbox), vbox, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (main_vbox), hbox, FALSE, FALSE, 0);
+
+  widget = gtk_combo_box_text_new ();
+  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (widget), "Horizontal");
+  gtk_combo_box_text_append_text (GTK_COMBO_BOX_TEXT (widget), "Vertical");
+  gtk_combo_box_set_active (GTK_COMBO_BOX (widget), 0);
+  gtk_widget_show (widget);
+  gtk_box_pack_start (GTK_BOX (vbox), widget, FALSE, FALSE, 0);
+
+  g_signal_connect (G_OBJECT (widget), "changed",
+                    G_CALLBACK (orientation_changed), scaffold);
+
+  widget = gtk_spin_button_new_with_range (0, 10, 1);
+  label = gtk_label_new ("Cell spacing");
+  hbox = gtk_hbox_new (FALSE, 4);
+  gtk_widget_show (hbox);
+  gtk_widget_show (label);
+  gtk_widget_show (widget);
+  gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE, 0);
+  gtk_box_pack_start (GTK_BOX (hbox), widget, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+
+  g_signal_connect (G_OBJECT (widget), "value-changed",
+                    G_CALLBACK (cell_spacing_changed), scaffold);
+
+
+  widget = gtk_spin_button_new_with_range (0, 10, 1);
+  label = gtk_label_new ("Row spacing");
+  hbox = gtk_hbox_new (FALSE, 4);
+  gtk_widget_show (hbox);
+  gtk_widget_show (label);
+  gtk_widget_show (widget);
+  gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE, 0);
+  gtk_box_pack_start (GTK_BOX (hbox), widget, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+
+  g_signal_connect (G_OBJECT (widget), "value-changed",
+                    G_CALLBACK (row_spacing_changed), scaffold);
+
+  widget = gtk_spin_button_new_with_range (0, 10, 1);
+  label = gtk_label_new ("Cell Margins");
+  hbox = gtk_hbox_new (FALSE, 4);
+  gtk_widget_show (hbox);
+  gtk_widget_show (label);
+  gtk_widget_show (widget);
+  gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE, 0);
+  gtk_box_pack_start (GTK_BOX (hbox), widget, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+
+  g_signal_connect (G_OBJECT (widget), "value-changed",
+                    G_CALLBACK (cell_margins_changed), scaffold);
+
+  widget = gtk_spin_button_new_with_range (0, 30, 1);
+  label = gtk_label_new ("Intentation");
+  hbox = gtk_hbox_new (FALSE, 4);
+  gtk_widget_show (hbox);
+  gtk_widget_show (label);
+  gtk_widget_show (widget);
+  gtk_box_pack_start (GTK_BOX (hbox), label, TRUE, TRUE, 0);
+  gtk_box_pack_start (GTK_BOX (hbox), widget, FALSE, FALSE, 0);
+  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+
+  g_signal_connect (G_OBJECT (widget), "value-changed",
+                    G_CALLBACK (indentation_changed), scaffold);
+
+  gtk_widget_show (window);
+}
+
+
+
+
+
+
 int
 main (int argc, char *argv[])
 {
@@ -441,6 +627,7 @@ main (int argc, char *argv[])
 
   simple_cell_area ();
   focus_cell_area ();
+  background_area ();
 
   gtk_main ();
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