GtkLabel: Add alpha support for buildable attributeswip/matthiasc/alpha

Make it possible to set foreground or background alpha in the
builder ui support for Pango attributes.

1 files changed, 8 insertions, 0 deletions

diff --git a/gtk/gtklabel.c b/gtk/gtklabel.c
index 592d8bac1d..a18b798c18 100644
--- a/gtk/gtklabel.c
+++ b/gtk/gtklabel.c
@@ -1541,6 +1541,14 @@ G_GNUC_END_IGNORE_DEPRECATIONS
     case PANGO_ATTR_FONT_FEATURES:
       attribute = pango_attr_font_features_new (value);
       break;
+    case PANGO_ATTR_FOREGROUND_ALPHA:
+      if (gtk_builder_value_from_string_type (builder, G_TYPE_INT, value, &val, error))
+        attribute = pango_attr_foreground_alpha_new ((guint16)value);
+      break;
+    case PANGO_ATTR_BACKGROUND_ALPHA:
+      if (gtk_builder_value_from_string_type (builder, G_TYPE_INT, value, &val, error))
+        attribute = pango_attr_background_alpha_new ((guint16)value);
+      break;
     case PANGO_ATTR_INVALID:
     default:
       break;