Add a demo showing combo box variations.

2005-05-25  Matthias Clasen  <mclasen@redhat.com>

	* demos/gtk-demo/Makefile.am (demos):
	* demos/gtk-demo/combobox.c: Add a demo showing combo box
	variations.

ChangeLog

 2005-05-25  Matthias Clasen  <mclasen@redhat.com>
 
+	* demos/gtk-demo/Makefile.am (demos): 
+	* demos/gtk-demo/combobox.c: Add a demo showing combo box 
+	variations.
+
 	* demos/gtk-demo/Makefile.am (demos): 
 	* demos/gtk-demo/pickers.c: Add a demo showing all picker widgets.
 

ChangeLog.pre-2-10

 2005-05-25  Matthias Clasen  <mclasen@redhat.com>
 
+	* demos/gtk-demo/Makefile.am (demos): 
+	* demos/gtk-demo/combobox.c: Add a demo showing combo box 
+	variations.
+
 	* demos/gtk-demo/Makefile.am (demos): 
 	* demos/gtk-demo/pickers.c: Add a demo showing all picker widgets.
 

ChangeLog.pre-2-8

 2005-05-25  Matthias Clasen  <mclasen@redhat.com>
 
+	* demos/gtk-demo/Makefile.am (demos): 
+	* demos/gtk-demo/combobox.c: Add a demo showing combo box 
+	variations.
+
 	* demos/gtk-demo/Makefile.am (demos): 
 	* demos/gtk-demo/pickers.c: Add a demo showing all picker widgets.
 

demos/gtk-demo/Makefile.am

@@ -10,6 +10,7 @@ demos =						\
 	changedisplay.c				\
 	clipboard.c				\
 	colorsel.c				\
+	combobox.c				\
 	dialog.c				\
 	drawingarea.c				\
 	editable_cells.c			\

demos/gtk-demo/combobox.c

+/* Combo boxes 
+ *
+ * The ComboBox widget allows to select one option out of a list.
+ * The ComboBoxEntry additionally allows the user to enter a value
+ * that is not in the list of options. 
+ *
+ * How the options are displayed is controlled by cell renderers.
+ */
+
+#include <gtk/gtk.h>
+
+enum 
+{
+  PIXBUF_COL,
+  TEXT_COL
+};
+
+static gchar *
+strip_underscore (const gchar *text)
+{
+  gchar *p, *q;
+  gchar *result;
+  
+  result = g_strdup (text);
+  p = q = result;
+  while (*p) 
+    {
+      if (*p != '_')
+	{
+	  *q = *p;
+	  q++;
+	}
+      p++;
+    }
+  *q = '\0';
+
+  return result;
+}
+
+static GtkTreeModel *
+create_stock_icon_store (void)
+{
+  gchar *stock_id[6] = {
+    GTK_STOCK_DIALOG_WARNING,
+    GTK_STOCK_STOP,
+    GTK_STOCK_NEW,
+    GTK_STOCK_CLEAR,
+    NULL,
+    GTK_STOCK_OPEN    
+  };
+
+  GtkStockItem item;
+  GdkPixbuf *pixbuf;
+  GtkWidget *cellview;
+  GtkTreeIter iter;
+  GtkListStore *store;
+  gchar *label;
+  gint i;
+
+  cellview = gtk_cell_view_new ();
+  
+  store = gtk_list_store_new (2, GDK_TYPE_PIXBUF, G_TYPE_STRING);
+
+  for (i = 0; i < G_N_ELEMENTS (stock_id); i++)
+    {
+      if (stock_id[i])
+	{
+	  pixbuf = gtk_widget_render_icon (cellview, stock_id[i],
+					   GTK_ICON_SIZE_BUTTON, NULL);
+	  gtk_stock_lookup (stock_id[i], &item);
+	  label = strip_underscore (item.label);
+	  gtk_list_store_append (store, &iter);
+	  gtk_list_store_set (store, &iter,
+			      PIXBUF_COL, pixbuf,
+			      TEXT_COL, label,
+			      -1);
+	  g_free (label);
+	}
+      else
+	{
+	  gtk_list_store_append (store, &iter);
+	  gtk_list_store_set (store, &iter,
+			      PIXBUF_COL, NULL,
+			      TEXT_COL, "separator",
+			      -1);
+	}
+    }
+
+  gtk_widget_destroy (cellview);
+  
+  return GTK_TREE_MODEL (store);
+}
+
+/* A GtkCellLayoutDataFunc that demonstrates how one can control
+ * sensitivity of rows. This particular function does nothing 
+ * useful and just makes the second row insensitive.
+ */
+static void
+set_sensitive (GtkCellLayout   *cell_layout,
+	       GtkCellRenderer *cell,
+	       GtkTreeModel    *tree_model,
+	       GtkTreeIter     *iter,
+	       gpointer         data)
+{
+  GtkTreePath *path;
+  gint *indices;
+  gboolean sensitive;
+
+  path = gtk_tree_model_get_path (tree_model, iter);
+  indices = gtk_tree_path_get_indices (path);
+  sensitive = indices[0] != 1;
+  gtk_tree_path_free (path);
+
+  g_object_set (cell, "sensitive", sensitive, NULL);
+}
+
+/* A GtkTreeViewRowSeparatorFunc that demonstrates how rows can be
+ * rendered as separators. This particular function does nothing 
+ * useful and just turns the fourth row into a separator.
+ */
+static gboolean
+is_separator (GtkTreeModel *model,
+	      GtkTreeIter  *iter,
+	      gpointer      data)
+{
+  GtkTreePath *path;
+  gboolean result;
+
+  path = gtk_tree_model_get_path (model, iter);
+  result = gtk_tree_path_get_indices (path)[0] == 4;
+  gtk_tree_path_free (path);
+
+  return result;
+}
+
+static GtkTreeModel *
+create_capital_store (void)
+{
+  struct {
+    gchar *group;
+    gchar *capital;
+  } capitals[] = {
+    { "A - B", NULL }, 
+    { NULL, "Albany" },
+    { NULL, "Annapolis" },
+    { NULL, "Atlanta" },
+    { NULL, "Augusta" }, 
+    { NULL, "Austin" },
+    { NULL, "Baton Rouge" },
+    { NULL, "Bismarck" },
+    { NULL, "Boise" },
+    { NULL, "Boston" },
+    { "C - D", NULL },
+    { NULL, "Carson City" },
+    { NULL, "Charleston" },
+    { NULL, "Cheyenne" },
+    { NULL, "Columbia" },
+    { NULL, "Columbus" },
+    { NULL, "Concord" },
+    { NULL, "Denver" },
+    { NULL, "Des Moines" },
+    { NULL, "Dover" },
+    { "E - J", NULL },
+    { NULL, "Frankfort" },
+    { NULL, "Harrisburg" },
+    { NULL, "Hartford" },
+    { NULL, "Helena" },
+    { NULL, "Honolulu" },
+    { NULL, "Indianapolis" },
+    { NULL, "Jackson" },
+    { NULL, "Jefferson City" },
+    { NULL, "Juneau" },
+    { "K - O" },
+    { NULL, "Lansing" },
+    { NULL, "Lincoln" },
+    { NULL, "Little Rock" },
+    { NULL, "Madison" },
+    { NULL, "Montgomery" },
+    { NULL, "Montpelier" },
+    { NULL, "Nashville" },
+    { NULL, "Oklahoma City" },
+    { NULL, "Olympia" },
+    { NULL, "P - S" },
+    { NULL, "Phoenix" },
+    { NULL, "Pierre" },
+    { NULL, "Providence" },
+    { NULL, "Raleigh" },
+    { NULL, "Richmond" },
+    { NULL, "Sacramento" },
+    { NULL, "Salem" },
+    { NULL, "Salt Lake City" },
+    { NULL, "Santa Fe" },
+    { NULL, "Springfield" },
+    { NULL, "St. Paul" },
+    { "T - Z", NULL },
+    { NULL, "Tallahassee" },
+    { NULL, "Topeka" },
+    { NULL, "Trenton" },
+    { NULL, NULL }
+  };
+  
+  GtkTreeIter iter, iter2;
+  GtkTreeStore *store;
+  gint i;
+
+  store = gtk_tree_store_new (1, G_TYPE_STRING);
+  
+  for (i = 0; capitals[i].group || capitals[i].capital; i++)
+    {
+      if (capitals[i].group)
+	{
+	  gtk_tree_store_append (store, &iter, NULL);
+	  gtk_tree_store_set (store, &iter, 0, capitals[i].group, -1);
+	}
+      else if (capitals[i].capital)
+	{
+	  gtk_tree_store_append (store, &iter2, &iter);
+	  gtk_tree_store_set (store, &iter2, 0, capitals[i].capital, -1);
+	}
+    }
+  
+  return GTK_TREE_MODEL (store);
+}
+
+static void
+is_capital_sensitive (GtkCellLayout   *cell_layout,
+		      GtkCellRenderer *cell,
+		      GtkTreeModel    *tree_model,
+		      GtkTreeIter     *iter,
+		      gpointer         data)
+{
+  gboolean sensitive;
+
+  sensitive = !gtk_tree_model_iter_has_child (tree_model, iter);
+
+  g_object_set (cell, "sensitive", sensitive, NULL);
+}
+
+static void
+fill_combo_entry (GtkWidget *entry)
+{
+  gtk_combo_box_append_text (GTK_COMBO_BOX (entry), "One");
+  gtk_combo_box_append_text (GTK_COMBO_BOX (entry), "Two");
+  gtk_combo_box_append_text (GTK_COMBO_BOX (entry), "2\302\275");
+  gtk_combo_box_append_text (GTK_COMBO_BOX (entry), "Three");
+}
+
+GtkWidget *
+do_combobox (GtkWidget *do_widget)
+{
+  static GtkWidget *window = NULL;
+  GtkWidget *vbox, *frame, *box, *combo;
+  GtkTreeModel *model;
+  GtkCellRenderer *renderer;
+  GtkTreePath *path;
+  GtkTreeIter iter;
+
+  if (!window)
+  {
+    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+    gtk_window_set_screen (GTK_WINDOW (window),
+                           gtk_widget_get_screen (do_widget));
+    gtk_window_set_title (GTK_WINDOW (window), "Combo boxes");
+   
+    g_signal_connect (window, "destroy",
+                      G_CALLBACK (gtk_widget_destroyed),
+                      &window);
+    
+    gtk_container_set_border_width (GTK_CONTAINER (window), 10);
+
+    vbox = gtk_vbox_new (FALSE, 2);
+    gtk_container_add (GTK_CONTAINER (window), vbox);
+
+    /* A combobox demonstrating cell renderers, separators and
+     *  insensitive rows 
+     */
+    frame = gtk_frame_new ("Some stock icons");
+    gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+    
+    box = gtk_vbox_new (FALSE, 0);
+    gtk_container_set_border_width (GTK_CONTAINER (box), 5);
+    gtk_container_add (GTK_CONTAINER (frame), box);
+    
+    model = create_stock_icon_store ();
+    combo = gtk_combo_box_new_with_model (model);
+    g_object_unref (model);
+    gtk_container_add (GTK_CONTAINER (box), combo);
+    
+    renderer = gtk_cell_renderer_pixbuf_new ();
+    gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (combo), renderer, FALSE);
+    gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (combo), renderer,
+				    "pixbuf", PIXBUF_COL, 
+				    NULL);
+
+    gtk_cell_layout_set_cell_data_func (GTK_CELL_LAYOUT (combo),
+					renderer,
+					set_sensitive,
+					NULL, NULL);
+    
+    renderer = gtk_cell_renderer_text_new ();
+    gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (combo), renderer, TRUE);
+    gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (combo), renderer,
+				    "text", TEXT_COL,
+				    NULL);
+
+    gtk_cell_layout_set_cell_data_func (GTK_CELL_LAYOUT (combo),
+					renderer,
+					set_sensitive,
+					NULL, NULL);
+
+    gtk_combo_box_set_row_separator_func (GTK_COMBO_BOX (combo), 
+					  is_separator, NULL, NULL);
+    
+    gtk_combo_box_set_active (GTK_COMBO_BOX (combo), 0);
+    
+    /* A combobox demonstrating trees.
+     */
+    frame = gtk_frame_new ("Where are we ?");
+    gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+
+    box = gtk_vbox_new (FALSE, 0);
+    gtk_container_set_border_width (GTK_CONTAINER (box), 5);
+    gtk_container_add (GTK_CONTAINER (frame), box);
+    
+    model = create_capital_store ();
+    combo = gtk_combo_box_new_with_model (model);
+    g_object_unref (model);
+    gtk_container_add (GTK_CONTAINER (box), combo);
+
+    renderer = gtk_cell_renderer_text_new ();
+    gtk_cell_layout_pack_start (GTK_CELL_LAYOUT (combo), renderer, TRUE);
+    gtk_cell_layout_set_attributes (GTK_CELL_LAYOUT (combo), renderer,
+				    "text", 0,
+				    NULL);
+    gtk_cell_layout_set_cell_data_func (GTK_CELL_LAYOUT (combo),
+					renderer,
+					is_capital_sensitive,
+					NULL, NULL);
+
+    path = gtk_tree_path_new_from_indices (0, 8, -1);
+    gtk_tree_model_get_iter (model, &iter, path);
+    gtk_tree_path_free (path);
+    gtk_combo_box_set_active_iter (GTK_COMBO_BOX (combo), &iter);
+
+    /* A GtkComboBoxEntry 
+     */
+    frame = gtk_frame_new ("Editable");
+    gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
+    
+    box = gtk_vbox_new (FALSE, 0);
+    gtk_container_set_border_width (GTK_CONTAINER (box), 5);
+    gtk_container_add (GTK_CONTAINER (frame), box);
+    
+    combo = gtk_combo_box_entry_new_text ();
+    fill_combo_entry (combo);
+    gtk_container_add (GTK_CONTAINER (box), combo);
+    
+  }
+
+  if (!GTK_WIDGET_VISIBLE (window))
+    {
+      gtk_widget_show_all (window);
+    }
+  else
+    {    
+      gtk_widget_destroy (window);
+      window = NULL;
+    }
+
+  return window;
+}