syleprovider: Add a vfunc to get the changes

This way we can check what changes are even interesting for our matcher.

1 files changed, 17 insertions, 0 deletions

diff --git a/gtk/gtkstyleproviderprivate.c b/gtk/gtkstyleproviderprivate.c
index 43ae1712ff..fc7e29862e 100644
--- a/gtk/gtkstyleproviderprivate.c
+++ b/gtk/gtkstyleproviderprivate.c
@@ -61,3 +61,20 @@ _gtk_style_provider_private_lookup (GtkStyleProviderPrivate *provider,
 
   iface->lookup (provider, matcher, lookup);
 }
+
+GtkCssChange
+_gtk_style_provider_private_get_change (GtkStyleProviderPrivate *provider,
+                                        const GtkCssMatcher     *matcher)
+{
+  GtkStyleProviderPrivateInterface *iface;
+
+  g_return_val_if_fail (GTK_IS_STYLE_PROVIDER_PRIVATE (provider), GTK_CSS_CHANGE_ANY);
+  g_return_val_if_fail (matcher != NULL, GTK_CSS_CHANGE_ANY);
+
+  iface = GTK_STYLE_PROVIDER_PRIVATE_GET_INTERFACE (provider);
+
+  if (!iface->get_change)
+    return GTK_CSS_CHANGE_ANY;
+
+  return iface->get_change (provider, matcher);
+}