Make image credits discoverable

This adds a fourth topbar button, to the left of the minimize button,
that is invisible by default. When you mouse over the space where it
would be, it appears. When you click on it, it activates the image
credits dialog.

[endlessm/eos-sdk#2934]

1 files changed, 13 insertions, 5 deletions

diff --git a/endless/eosapplication.c b/endless/eosapplication.c
index 91dbd73..510ff3b 100644
--- a/endless/eosapplication.c
+++ b/endless/eosapplication.c
@@ -612,6 +612,16 @@ eos_application_class_init (EosApplicationClass *klass)
 }
 
 static void
+set_image_credits_action_enabled (EosApplication *self,
+                                  gboolean        enabled)
+{
+  GAction *action = g_action_map_lookup_action (G_ACTION_MAP (self),
+                                                "image-credits");
+  g_simple_action_set_enabled (G_SIMPLE_ACTION (action), enabled);
+  /* action map owns action */
+}
+
+static void
 eos_application_init (EosApplication *self)
 {
   EosApplicationPrivate *priv = eos_application_get_instance_private (self);
@@ -623,6 +633,7 @@ eos_application_init (EosApplication *self)
   };
   g_action_map_add_action_entries (G_ACTION_MAP (self), actions,
                                    G_N_ELEMENTS (actions), self);
+  set_image_credits_action_enabled (self, FALSE);
 
   g_signal_connect (self, "notify::application-id",
                     G_CALLBACK (on_app_id_set), self);
@@ -734,11 +745,8 @@ eos_application_set_image_attribution_file (EosApplication *self,
 
   if (priv->image_attribution_file == NULL || file == NULL)
     {
-      GAction *action = g_action_map_lookup_action (G_ACTION_MAP (self),
-                                                    "image-credits");
-      gboolean enabled = (file == NULL);
-      g_simple_action_set_enabled (G_SIMPLE_ACTION (self), enabled);
-      /* action map owns action */
+      gboolean enabled = (file != NULL);
+      set_image_credits_action_enabled (self, enabled);
     }
 
   g_clear_object (&priv->image_attribution_file);