1 files changed, 21 insertions, 0 deletions

diff --git a/src/setup/gnunet-setup-options.h b/src/setup/gnunet-setup-options.h
index 31727d30..c1dbf44b 100644
--- a/src/setup/gnunet-setup-options.h
+++ b/src/setup/gnunet-setup-options.h
@@ -65,6 +65,17 @@ typedef int (*GNUNET_SETUP_SaveFunction) (const void *cls, const char *section,
 
 
 /**
+ * Function called each time the widget changes its state to validate
+ * its value.
+ *
+ * @param cls closure
+ * @param widget widget whose state was changed
+ */
+typedef void (*GNUNET_SETUP_InputValidationFunction) (const void *cls,
+                                                      GObject *widget);
+
+
+/**
  * Structs of this type specify under which conditions the values of
  * a particular option impact the visibility (or sensitivity) of some
  * other widget.
@@ -143,6 +154,16 @@ struct GNUNET_SETUP_OptionSpecification
   const void *load_save_cls;
 
   /**
+   * Function to call to validate the value of the widget.
+   */
+  GNUNET_SETUP_InputValidationFunction input_validation_function;
+
+  /**
+   * Closure for 'input_validation_function'.
+   */
+  const void *input_validation_function_cls;
+
+  /**
    * Visibility changes to apply if this option changes (NULL, or
    * NULL-terminated).
    */