[eog-plugins] postasa: Disable upload action if no images are selected

[Felix Riemann <friemann src gnome org>]

commit de573cf3e960daec249733be71c696b63174a075
Author: Felix Riemann <friemann gnome org>
Date:   Tue Sep 29 15:36:22 2015 +0200

    postasa: Disable upload action if no images are selected
    
    Nothing would happen, so don't offer it.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=755244

 plugins/postasa/eog-postasa-plugin.c |   38 ++++++++++++++++++++++++++++++++++
 1 files changed, 38 insertions(+), 0 deletions(-)
---
diff --git a/plugins/postasa/eog-postasa-plugin.c b/plugins/postasa/eog-postasa-plugin.c
index f7363b4..1d0473e 100644
--- a/plugins/postasa/eog-postasa-plugin.c
+++ b/plugins/postasa/eog-postasa-plugin.c
@@ -774,6 +774,35 @@ login_get_dialog (EogPostasaPlugin *plugin)
 
 /*** EogPlugin Functions ***/
 
+static void
+eog_postasa_plugin_update_action_state (EogPostasaPlugin *plugin)
+{
+       EogPostasaPluginPrivate *priv = plugin->priv;
+       GAction *action;
+       EogThumbView *thumbview;
+       gboolean enable = FALSE;
+
+       thumbview = EOG_THUMB_VIEW (eog_window_get_thumb_view (priv->eog_window));
+
+       if (G_LIKELY (thumbview))
+       {
+               enable = (eog_thumb_view_get_n_selected (thumbview) != 0);
+       }
+
+       action = g_action_map_lookup_action (G_ACTION_MAP (priv->eog_window),
+                                            EOG_POSTASA_PLUGIN_ACTION);
+       g_simple_action_set_enabled (G_SIMPLE_ACTION (action), enable);
+}
+
+static void
+_selection_changed_cb (EogThumbView *thumbview, gpointer user_data)
+{
+       EogPostasaPlugin *plugin = EOG_POSTASA_PLUGIN (user_data);
+
+       if (G_LIKELY (plugin))
+               eog_postasa_plugin_update_action_state (plugin);
+}
+
 /**
  * impl_activate:
  *
@@ -802,6 +831,12 @@ impl_activate (EogWindowActivatable *activatable)
                                 G_ACTION (action));
        g_object_unref (action);
 
+       g_signal_connect (G_OBJECT (eog_window_get_thumb_view (plugin->priv->eog_window)),
+                         "selection-changed",
+                         G_CALLBACK (_selection_changed_cb),
+                         plugin);
+       eog_postasa_plugin_update_action_state (plugin);
+
        /* Append entry to the window's gear menu */
        menu = g_menu_new ();
        g_menu_append (menu, _("Upload to PicasaWeb"),
@@ -850,6 +885,9 @@ impl_deactivate     (EogWindowActivatable *activatable)
                }
        }
 
+       g_signal_handlers_disconnect_by_func (eog_window_get_thumb_view (plugin->priv->eog_window),
+                                             _selection_changed_cb, plugin);
+
        /* Finally remove action */
        g_action_map_remove_action (G_ACTION_MAP (plugin->priv->eog_window),
                                    EOG_POSTASA_PLUGIN_ACTION);