quick checks on empty control lists, to avoid unnecessary work

[ardour.git] / gtk2_ardour / session_metadata_dialog.cc

diff --git a/gtk2_ardour/session_metadata_dialog.cc b/gtk2_ardour/session_metadata_dialog.cc
index f4e708f62ae359cb890c0e5f367f392fea3a9ffd..88720edc7460c7352c007fb58ee7b8ec67a5a5a2 100644 (file)
--- a/gtk2_ardour/session_metadata_dialog.cc
+++ b/gtk2_ardour/session_metadata_dialog.cc
@@ -228,6 +228,7 @@ EAN13MetadataField::EAN13MetadataField (Getter getter, Setter setter, string con
        entry = 0;
        label = 0;
        value_label = 0;
+       status_label = Gtk::manage (new Gtk::Label (""));
 }
 
 MetadataPtr
@@ -249,6 +250,7 @@ EAN13MetadataField::load_data (ARDOUR::SessionMetadata const & data)
        if (entry) {
                entry->set_text (_value);
        }
+       update_status ();
 }
 
 void
@@ -257,6 +259,45 @@ EAN13MetadataField::update_value ()
        // Accept only numeric characters
        _value = numeric_string (entry->get_text());
        entry->set_text (_value);
+       update_status ();
+}
+
+void
+EAN13MetadataField::update_status ()
+{
+       int len = _value.length ();
+       if (len == 13) {
+               // calculate EAN-13 modulo 10 check digit
+               int sum = 0;
+               const char *p = _value.c_str();
+               for (int i = 0; i < 12; i++) {
+                       char c = p[i] - '0';
+                       if (i % 2) {
+                               sum += c * 3;
+                       } else {
+                               sum += c;
+                       }
+               }
+               sum %= 10;
+               if (sum)
+                       sum = 10 - sum;
+
+               if (sum == p[12] - '0') {
+                       status_label->set_markup (string_compose(
+                                               "<span color=\"green\">%1: %2</span>",
+                                               _("EAN Check digit OK"), sum));
+               } else {
+                       status_label->set_markup (string_compose(
+                                               "<span color=\"#ffa755\">%1: %2 (%3 %4)</span>",
+                                               _("EAN Check digit error"), p[12] - '0', _("expected"), sum));
+               }
+       } else if (len > 0) {
+               status_label->set_markup (string_compose(
+                                       "<span color=\"#ffa755\">%1: %2 (&lt;13)</span>",
+                                       _("EAN Length error"), len));
+       } else {
+               status_label->set_text("");
+       }
 }
 
 Gtk::Widget &
@@ -694,6 +735,11 @@ SessionMetadataDialog<DataSet>::init_album_data ()
 
        ptr = MetadataPtr (new EAN13MetadataField (&ARDOUR::SessionMetadata::barcode, &ARDOUR::SessionMetadata::set_barcode, _("EAN barcode")));
        data_set->add_data_field (ptr);
+
+       // EAN13MetadataField is the only kind of MetadataField which has a status label.
+       EAN13MetadataField &emf = (EAN13MetadataField &) *ptr;
+       ((Gtk::VBox &) data_set->get_widget()).pack_end (*emf.status_label);
+       emf.update_status ();
 }
 
 template <typename DataSet>
@@ -857,7 +903,7 @@ SessionMetadataImporter::run ()
                return;
        }
 
-       //create a temporary 
+       //create a temporary
        ARDOUR::SessionMetadata data;
        data.set_state (*node, version);
        init_data ( true );  //skip user data here