inspector: Improve details buttons

Ensure that the details buttons are only sensitive when
we actually have details to show.

gtk/inspector/object-tree.c

@@ -124,8 +124,7 @@ on_selection_changed (GtkTreeSelection       *selection,
   GObject *object;
 
   object = gtk_inspector_object_tree_get_selected (wt);
-  if (object)
-    g_signal_emit (wt, signals[OBJECT_SELECTED], 0, object);
+  g_signal_emit (wt, signals[OBJECT_SELECTED], 0, object);
 }
 
 

gtk/inspector/resource-list.c

@@ -224,6 +224,39 @@ row_activated (GtkTreeView              *treeview,
   gtk_stack_set_visible_child_name (GTK_STACK (sl->priv->buttons), "details");
 }
 
+static gboolean
+can_show_details (GtkInspectorResourceList *rl)
+{
+  GtkTreeSelection *selection;
+  GtkTreeModel *model;
+  GtkTreeIter iter;
+  gchar *path;
+
+  selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (rl->priv->tree));
+  if (!gtk_tree_selection_get_selected (selection, &model, &iter))
+    return FALSE;
+
+  gtk_tree_model_get (GTK_TREE_MODEL (rl->priv->model), &iter,
+                      COLUMN_PATH, &path,
+                      -1);
+
+   if (g_str_has_suffix (path, "/"))
+     {
+       g_free (path);
+       return FALSE;
+     }
+
+  g_free (path);
+  return TRUE;
+}
+
+static void
+on_selection_changed (GtkTreeSelection         *selection,
+                      GtkInspectorResourceList *rl)
+{
+  gtk_widget_set_sensitive (rl->priv->open_details_button, can_show_details (rl));
+}
+
 static void
 open_details (GtkWidget                *button,
               GtkInspectorResourceList *sl)
@@ -265,6 +298,7 @@ visible_child_name_changed (GObject *obj, GParamSpec *pspec, GtkInspectorResourc
   resources_visible = g_strcmp0 (child, "resources") == 0;
 
   gtk_widget_set_visible (sl->priv->buttons, resources_visible);
+  gtk_widget_set_sensitive (sl->priv->open_details_button, can_show_details (sl));
 }
 
 static void
@@ -439,6 +473,7 @@ gtk_inspector_resource_list_class_init (GtkInspectorResourceListClass *klass)
   gtk_widget_class_bind_template_child_private (widget_class, GtkInspectorResourceList, tree);
 
   gtk_widget_class_bind_template_callback (widget_class, row_activated);
+  gtk_widget_class_bind_template_callback (widget_class, on_selection_changed);
 }
 
 // vim: set et sw=2 ts=2:

gtk/inspector/resource-list.ui

@@ -31,6 +31,7 @@
                 <child internal-child="selection">
                   <object class="GtkTreeSelection">
                     <property name="mode">single</property>
+                    <signal name="changed" handler="on_selection_changed"/>
                   </object>
                 </child>
                 <child>

gtk/inspector/window.c

@@ -100,6 +100,7 @@ on_object_selected (GtkInspectorObjectTree *wt,
                     GObject                *selected,
                     GtkInspectorWindow     *iw)
 {
+  gtk_widget_set_sensitive (iw->object_details_button, selected != NULL);
   if (GTK_IS_WIDGET (selected))
     gtk_inspector_flash_widget (iw, GTK_WIDGET (selected));
 }
@@ -176,6 +177,7 @@ gtk_inspector_window_class_init (GtkInspectorWindowClass *klass)
   gtk_widget_class_bind_template_child (widget_class, GtkInspectorWindow, object_tree);
   gtk_widget_class_bind_template_child (widget_class, GtkInspectorWindow, object_details);
   gtk_widget_class_bind_template_child (widget_class, GtkInspectorWindow, object_buttons);
+  gtk_widget_class_bind_template_child (widget_class, GtkInspectorWindow, object_details_button);
   gtk_widget_class_bind_template_child (widget_class, GtkInspectorWindow, select_object);
   gtk_widget_class_bind_template_child (widget_class, GtkInspectorWindow, prop_list);
   gtk_widget_class_bind_template_child (widget_class, GtkInspectorWindow, child_prop_list);

gtk/inspector/window.h

@@ -47,6 +47,7 @@ typedef struct
   GtkWidget *object_id;
   GtkWidget *object_details;
   GtkWidget *object_buttons;
+  GtkWidget *object_details_button;
   GtkWidget *select_object;
   GtkWidget *prop_list;
   GtkWidget *child_prop_list;

gtk/inspector/window.ui

@@ -34,7 +34,7 @@
           <object class="GtkStack" id="object_buttons">
             <property name="visible">True</property>
             <child>
-              <object class="GtkButton">
+              <object class="GtkButton" id="object_details_button">
                 <property name="visible">True</property>
                 <property name="tooltip-text" translatable="yes">Show Details</property>
                 <property name="halign">center</property>