[gthumb] set the about button insensitive when no extension is selected

[Paolo Bacchilega <paobac src gnome org>]

commit 2c32367a624a367c045412a24d20eacf383cd727
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Jun 26 22:40:24 2011 +0200

    set the about button insensitive when no extension is selected

 data/ui/extensions-preferences.ui   |    2 +-
 gthumb/dlg-preferences-extensions.c |   25 ++++++++++++++-----------
 2 files changed, 15 insertions(+), 12 deletions(-)
---
diff --git a/data/ui/extensions-preferences.ui b/data/ui/extensions-preferences.ui
index e234712..1bb392d 100644
--- a/data/ui/extensions-preferences.ui
+++ b/data/ui/extensions-preferences.ui
@@ -74,7 +74,6 @@
                 <property name="height_request">350</property>
                 <property name="visible">True</property>
                 <property name="can_focus">True</property>
-                <property name="hscrollbar_policy">automatic</property>
                 <property name="shadow_type">in</property>
                 <child>
                   <placeholder/>
@@ -157,6 +156,7 @@
           <object class="GtkButton" id="about_button">
             <property name="label">gtk-about</property>
             <property name="visible">True</property>
+            <property name="sensitive">False</property>
             <property name="can_focus">True</property>
             <property name="receives_default">True</property>
             <property name="use_action_appearance">False</property>
diff --git a/gthumb/dlg-preferences-extensions.c b/gthumb/dlg-preferences-extensions.c
index 423844e..01124f8 100644
--- a/gthumb/dlg-preferences-extensions.c
+++ b/gthumb/dlg-preferences-extensions.c
@@ -330,22 +330,25 @@ static void
 list_view_selection_changed_cb (GtkTreeSelection *treeselection,
                                 gpointer          user_data)
 {
-	BrowserData             *data = user_data;
-	GtkTreeModel            *model;
-	GtkTreeIter              iter;
-	GthExtensionDescription *description;
-	GthExtension            *extension;
+	BrowserData  *data = user_data;
+	GtkTreeModel *model;
+	GtkTreeIter   iter;
+	GthExtension *extension;
+
+	extension = NULL;
 
 	model = GTK_TREE_MODEL (data->model_filter);
-	if (! gtk_tree_selection_get_selected (treeselection, &model, &iter))
-		return;
+	if (gtk_tree_selection_get_selected (treeselection, &model, &iter)) {
+		GthExtensionDescription *description;
 
-	gtk_tree_model_get (model, &iter, EXTENSION_DESCRIPTION_COLUMN, &description, -1);
+		gtk_tree_model_get (model, &iter, EXTENSION_DESCRIPTION_COLUMN, &description, -1);
+		extension = gth_extension_description_get_extension (description);
 
-	extension = gth_extension_description_get_extension (description);
-	gtk_widget_set_sensitive (GET_WIDGET ("preferences_button"), (extension != NULL) && gth_extension_is_configurable (extension));
+		g_object_unref (description);
+	}
 
-	g_object_unref (description);
+	gtk_widget_set_sensitive (GET_WIDGET ("about_button"), (extension != NULL));
+	gtk_widget_set_sensitive (GET_WIDGET ("preferences_button"), (extension != NULL) && gth_extension_is_configurable (extension));
 }