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

[Felix Riemann <friemann src gnome org>]

commit 39e8d056aa2ebfabf353cf607e517338fcb5c57e
Author: Felix Riemann <friemann gnome org>
Date:   Tue Sep 29 15:14:31 2015 +0200

    postr: Disable action if no images are selected
    
    https://bugzilla.gnome.org/show_bug.cgi?id=755244

 plugins/postr/eog-postr-plugin.c |   37 +++++++++++++++++++++++++++++++++++++
 1 files changed, 37 insertions(+), 0 deletions(-)
---
diff --git a/plugins/postr/eog-postr-plugin.c b/plugins/postr/eog-postr-plugin.c
index a42b345..3dcd01a 100644
--- a/plugins/postr/eog-postr-plugin.c
+++ b/plugins/postr/eog-postr-plugin.c
@@ -70,6 +70,33 @@ postr_cb (GSimpleAction *simple,
        g_free (cmd);
 }
 
+static void
+eog_postr_plugin_update_action_state (EogPostrPlugin *plugin)
+{
+       GAction *action;
+       EogThumbView *thumbview;
+       gboolean enable = FALSE;
+
+       thumbview = EOG_THUMB_VIEW (eog_window_get_thumb_view (plugin->window));
+
+       if (G_LIKELY (thumbview))
+       {
+               enable = (eog_thumb_view_get_n_selected (thumbview) != 0);
+       }
+
+       action = g_action_map_lookup_action (G_ACTION_MAP (plugin->window),
+                                            EOG_POSTR_PLUGIN_ACTION);
+       g_simple_action_set_enabled (G_SIMPLE_ACTION (action), enable);
+}
+
+static void
+_selection_changed_cb (EogThumbView *thumbview, gpointer user_data)
+{
+       EogPostrPlugin *plugin = EOG_POSTR_PLUGIN (user_data);
+
+       if (G_LIKELY (plugin))
+               eog_postr_plugin_update_action_state (plugin);
+}
 
 static void
 eog_postr_plugin_init (EogPostrPlugin *plugin)
@@ -118,6 +145,12 @@ impl_activate (EogWindowActivatable *activatable)
                                 G_ACTION (action));
        g_object_unref (action);
 
+       g_signal_connect (G_OBJECT (eog_window_get_thumb_view (plugin->window)),
+                         "selection-changed",
+                         G_CALLBACK (_selection_changed_cb),
+                         plugin);
+       eog_postr_plugin_update_action_state (plugin);
+
        /* Append entry to the window's gear menu */
        menu = g_menu_new ();
        g_menu_append (menu, _("Upload to Flickr"),
@@ -166,6 +199,10 @@ impl_deactivate    (EogWindowActivatable *activatable)
                }
        }
 
+       g_signal_handlers_disconnect_by_func (eog_window_get_thumb_view (plugin->window),
+                                             _selection_changed_cb, plugin);
+
+
        /* Finally remove action */
        g_action_map_remove_action (G_ACTION_MAP (plugin->window),
                                    EOG_POSTR_PLUGIN_ACTION);