[gnome-builder] tree: update project tree actions when selection changes

[Christian Hergert <chergert src gnome org>]

commit ef81c4dce9edcfb1f12e3549ff419ebaf6243d07
Author: Christian Hergert <christian hergert me>
Date:   Wed Apr 8 14:49:51 2015 -0700

    tree: update project tree actions when selection changes
    
    We need to change the sensitivity of various actions when the selected
    node changes. This gives us some nice infrastructure to do so.

 src/editor/gb-project-tree-actions.c |   80 ++++++++++++++++++++++++++++++++++
 1 files changed, 80 insertions(+), 0 deletions(-)
---
diff --git a/src/editor/gb-project-tree-actions.c b/src/editor/gb-project-tree-actions.c
index 106da7f..723a930 100644
--- a/src/editor/gb-project-tree-actions.c
+++ b/src/editor/gb-project-tree-actions.c
@@ -26,6 +26,79 @@
 #include "gb-workbench.h"
 
 static void
+action_set (GActionGroup *group,
+            const gchar  *action_name,
+            const gchar  *first_param,
+            ...)
+{
+  GAction *action;
+  va_list args;
+
+  g_assert (G_IS_ACTION_GROUP (group));
+  g_assert (G_IS_ACTION_MAP (group));
+
+  action = g_action_map_lookup_action (G_ACTION_MAP (group), action_name);
+  g_assert (G_IS_SIMPLE_ACTION (action));
+
+  va_start (args, first_param);
+  g_object_set_valist (G_OBJECT (action), first_param, args);
+  va_end (args);
+}
+
+static gboolean
+is_project_file_not_directory (GObject *object)
+{
+  GFileInfo *info;
+
+  g_assert (!object || G_IS_OBJECT (object));
+
+  return (IDE_IS_PROJECT_FILE (object) &&
+          (info = ide_project_file_get_file_info (IDE_PROJECT_FILE (object))) &&
+          (g_file_info_get_file_type (info) != G_FILE_TYPE_DIRECTORY));
+}
+
+static void
+gb_project_tree_actions_update_actions (GbEditorWorkspace *editor)
+{
+  GActionGroup *group;
+  GbTreeNode *selection;
+  GObject *item = NULL;
+
+  IDE_ENTRY;
+
+  g_assert (GB_IS_EDITOR_WORKSPACE (editor));
+  group = gtk_widget_get_action_group (GTK_WIDGET (editor), "project-tree");
+  g_assert (G_IS_SIMPLE_ACTION_GROUP (group));
+
+  selection = gb_tree_get_selected (editor->project_tree);
+  if (selection != NULL)
+    item = gb_tree_node_get_item (selection);
+
+  action_set (group, "open",
+              "enabled", is_project_file_not_directory (item),
+              NULL);
+  action_set (group, "open-with-editor",
+              "enabled", is_project_file_not_directory (item),
+              NULL);
+  action_set (group, "open-containing-folder",
+              "enabled", IDE_IS_PROJECT_FILE (item),
+              NULL);
+
+  IDE_EXIT;
+}
+
+static void
+gb_project_tree_actions__notify_selection (GbTree            *tree,
+                                           GParamSpec        *pspec,
+                                           GbEditorWorkspace *editor)
+{
+  g_assert (GB_IS_TREE (tree));
+  g_assert (GB_IS_EDITOR_WORKSPACE (editor));
+
+  gb_project_tree_actions_update_actions (editor);
+}
+
+static void
 gb_project_tree_actions_refresh (GSimpleAction *action,
                                  GVariant      *variant,
                                  gpointer       user_data)
@@ -183,4 +256,11 @@ gb_project_tree_actions_init (GbEditorWorkspace *editor)
   g_action_map_add_action (G_ACTION_MAP (actions), action);
 
   gtk_widget_insert_action_group (GTK_WIDGET (editor), "project-tree", G_ACTION_GROUP (actions));
+
+  g_signal_connect (editor->project_tree,
+                    "notify::selection",
+                    G_CALLBACK (gb_project_tree_actions__notify_selection),
+                    editor);
+
+  gb_project_tree_actions_update_actions (editor);
 }