css: Add a check function for specified types

... and use it.

It seems kinda necessary for the refactoring I'm about to do...

1 files changed, 23 insertions, 0 deletions

diff --git a/gtk/gtkcssstyleproperty.c b/gtk/gtkcssstyleproperty.c
index 348ea0d163..ad713ec422 100644
--- a/gtk/gtkcssstyleproperty.c
+++ b/gtk/gtkcssstyleproperty.c
@@ -28,6 +28,7 @@
 #include "gtkprivatetypebuiltins.h"
 #include "gtkstylepropertiesprivate.h"
 
+#include <cairo-gobject.h>
 #include "gtkcssimagegradientprivate.h"
 #include "gtkcssimageprivate.h"
 
@@ -441,6 +442,28 @@ _gtk_css_style_property_get_specified_type (GtkCssStyleProperty *property)
   return G_VALUE_TYPE (&property->initial_value);
 }
 
+gboolean
+_gtk_css_style_property_is_specified_type (GtkCssStyleProperty *property,
+                                           GType                type)
+{
+  g_return_val_if_fail (GTK_IS_CSS_STYLE_PROPERTY (property), FALSE);
+
+  /* If it's our specified type, of course it's valid */
+  if (type == G_VALUE_TYPE (&property->initial_value))
+    return TRUE;
+
+  /* The special values 'inherit' and 'initial' are always valid */
+  if (type == GTK_TYPE_CSS_SPECIAL_VALUE)
+    return TRUE;
+
+  /* XXX: Someone needs to fix that legacy */
+  if (G_VALUE_TYPE (&property->initial_value) == CAIRO_GOBJECT_TYPE_PATTERN &&
+      type == GTK_TYPE_GRADIENT)
+    return TRUE;
+
+  return FALSE;
+}
+
 /**
  * _gtk_css_style_property_compute_value:
  * @property: the property