[gnome-builder/wip/gtk4-port: 1486/1774] libide/foundry: add helper for GMenu of configurations

[Christian Hergert <chergert src gnome org>]

commit 48479e3d45821c2b9b9260f62e442065f40b89e9
Author: Christian Hergert <chergert redhat com>
Date:   Mon Jun 13 16:39:13 2022 -0700

    libide/foundry: add helper for GMenu of configurations
    
    These can be set using config-manager.current action, which is provided
    by the IdeConfigManager. So the menu works so long as that object is
    somewhere in the widget hierarchy attached as a gactiongroup.

 src/libide/foundry/ide-config-manager.c | 83 +++++++++++++++++++++++++++++++++
 src/libide/foundry/ide-config-manager.h |  2 +
 2 files changed, 85 insertions(+)
---
diff --git a/src/libide/foundry/ide-config-manager.c b/src/libide/foundry/ide-config-manager.c
index 22602bb36..97ecd30a8 100644
--- a/src/libide/foundry/ide-config-manager.c
+++ b/src/libide/foundry/ide-config-manager.c
@@ -44,6 +44,9 @@ struct _IdeConfigManager
   PeasExtensionSet *providers;
   GSettings        *project_settings;
 
+  GMenu            *menu;
+  GMenu            *config_menu;
+
   guint             queued_save_source;
 
   guint             propagate_to_settings : 1;
@@ -353,11 +356,64 @@ ide_config_manager_dispose (GObject *object)
   G_OBJECT_CLASS (ide_config_manager_parent_class)->dispose (object);
 }
 
+static void
+config_notify_cb (IdeConfig  *config,
+                  GParamSpec *pspec,
+                  GMenuItem  *item)
+{
+  g_assert (IDE_IS_CONFIG (config));
+  g_assert (G_IS_MENU_ITEM (item));
+
+  if (pspec == NULL || ide_str_equal0 (pspec->name, "display-name"))
+    {
+      const char *name = ide_config_get_display_name (config);
+      g_menu_item_set_label (item, name);
+    }
+
+  if (pspec == NULL || ide_str_equal0 (pspec->name, "id"))
+    {
+      const char *id = ide_config_get_id (config);
+      g_menu_item_set_action_and_target (item,
+                                         "config-manager.current",
+                                         "s", id);
+    }
+}
+
+static void
+items_changed_cb (IdeConfigManager *self,
+                  guint             position,
+                  guint             removed,
+                  guint             added)
+{
+  g_assert (IDE_IS_CONFIG_MANAGER (self));
+
+  for (guint i = 0; i < removed; i++)
+    g_menu_remove (self->config_menu, position + i);
+
+  for (guint i = 0; i < added; i++)
+    {
+      g_autoptr(IdeConfig) config = g_list_model_get_item (G_LIST_MODEL (self), position + i);
+      g_autoptr(GMenuItem) item = g_menu_item_new (NULL, NULL);
+
+      g_menu_item_set_attribute (item, "role", "s", "check");
+
+      g_signal_connect_object (config,
+                               "notify",
+                               G_CALLBACK (config_notify_cb),
+                               item,
+                               0);
+      config_notify_cb (config, NULL, item);
+      g_menu_insert_item (self->config_menu, position + i, item);
+    }
+}
+
 static void
 ide_config_manager_finalize (GObject *object)
 {
   IdeConfigManager *self = (IdeConfigManager *)object;
 
+  g_clear_object (&self->menu);
+  g_clear_object (&self->config_menu);
   g_clear_object (&self->current);
   g_clear_object (&self->cancellable);
   g_clear_pointer (&self->configs, g_array_unref);
@@ -466,6 +522,17 @@ ide_config_manager_init (IdeConfigManager *self)
   self->cancellable = g_cancellable_new ();
   self->configs = g_array_new (FALSE, FALSE, sizeof (ConfigInfo));
   g_array_set_clear_func (self->configs, config_info_clear);
+
+  self->menu = g_menu_new ();
+  self->config_menu = g_menu_new ();
+  g_menu_append_submenu (self->menu,
+                         _("Active Configuration"),
+                         G_MENU_MODEL (self->config_menu));
+
+  g_signal_connect (self,
+                    "items-changed",
+                    G_CALLBACK (items_changed_cb),
+                    NULL);
 }
 
 static GType
@@ -1135,3 +1202,19 @@ ide_config_manager_ref_from_context (IdeContext *context)
 
   return ide_object_ensure_child_typed (IDE_OBJECT (context), IDE_TYPE_CONFIG_MANAGER);
 }
+
+/**
+ * ide_config_manager_get_menu:
+ * @self: a #IdeConfigManager
+ *
+ * Gets the menu for the config manager.
+ *
+ * Returns: (transfer none): a #GMenuModel
+ */
+GMenuModel *
+ide_config_manager_get_menu (IdeConfigManager *self)
+{
+  g_return_val_if_fail (IDE_IS_CONFIG_MANAGER (self), NULL);
+
+  return G_MENU_MODEL (self->menu);
+}
diff --git a/src/libide/foundry/ide-config-manager.h b/src/libide/foundry/ide-config-manager.h
index 4961e4e0c..ba3befee7 100644
--- a/src/libide/foundry/ide-config-manager.h
+++ b/src/libide/foundry/ide-config-manager.h
@@ -66,5 +66,7 @@ gboolean          ide_config_manager_save_finish      (IdeConfigManager     *sel
                                                        GError              **error);
 IDE_AVAILABLE_IN_ALL
 gboolean          ide_config_manager_get_ready        (IdeConfigManager     *self);
+IDE_AVAILABLE_IN_ALL
+GMenuModel       *ide_config_manager_get_menu         (IdeConfigManager     *self);
 
 G_END_DECLS