[baobab/wip/vala] Implement basic chart navigation

[Paolo Borelli <pborelli src gnome org>]

commit b9824ec7a2b24380f4c84e5b0b01e9b92b8fb6e5
Author: Paolo Borelli <pborelli gnome org>
Date:   Sun Jan 15 11:45:57 2012 +0100

    Implement basic chart navigation
    
    Add a default handler to chart item-activated signal that allows to
    drill in/out of the chart.

 src/baobab-chart.c |   34 ++++++++++++++++++++++++++++++++--
 1 files changed, 32 insertions(+), 2 deletions(-)
---
diff --git a/src/baobab-chart.c b/src/baobab-chart.c
index e3da649..1c8d2a9 100644
--- a/src/baobab-chart.c
+++ b/src/baobab-chart.c
@@ -142,6 +142,9 @@ static gboolean baobab_chart_query_tooltip (GtkWidget  *widget,
                                             gboolean    keyboard_mode,
                                             GtkTooltip *tooltip,
                                             gpointer    user_data);
+static void baobab_chart_item_activated (BaobabChart *chart,
+                                         GtkTreeIter *iter);
+
 
 static void
 baobab_chart_class_init (BaobabChartClass *class)
@@ -166,7 +169,10 @@ baobab_chart_class_init (BaobabChartClass *class)
   widget_class->popup_menu = baobab_chart_popup_menu;
   widget_class->scroll_event = baobab_chart_scroll;
 
-  /* Baobab Chart abstract methods */
+  /* BaobabChart signals */
+  class->item_activated = baobab_chart_item_activated;
+
+  /* BaobabChart abstract methods */
   class->draw_item               = NULL;
   class->pre_draw                = NULL;
   class->post_draw               = NULL;
@@ -203,7 +209,7 @@ baobab_chart_class_init (BaobabChartClass *class)
                                    G_PARAM_READWRITE));
 
   baobab_chart_signals[ITEM_ACTIVATED] =
-    g_signal_new ("item_activated",
+    g_signal_new ("item-activated",
           G_TYPE_FROM_CLASS (obj_class),
           G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
           G_STRUCT_OFFSET (BaobabChartClass, item_activated),
@@ -1205,6 +1211,30 @@ baobab_chart_query_tooltip (GtkWidget  *widget,
   return TRUE;
 }
 
+static void
+baobab_chart_item_activated (BaobabChart *chart,
+                             GtkTreeIter *iter)
+{
+  GtkTreePath *root_path;
+  GtkTreePath *path;
+
+  root_path = baobab_chart_get_root (chart);
+  path = gtk_tree_model_get_path (chart->priv->model, iter);
+
+  if (root_path != NULL && gtk_tree_path_compare (root_path, path) == 0)
+    {
+      /* When the root is activated we try to move up */
+      baobab_chart_move_up_root (chart);
+    }
+  else
+    {
+      baobab_chart_set_root (chart, path);
+    }
+
+  gtk_tree_path_free (root_path);
+  gtk_tree_path_free (path);
+}
+
 static GdkPixbuf *
 baobab_chart_get_pixbuf (BaobabChart *chart)
 {