draw red box around bad input fields

1 files changed, 1 insertions, 0 deletions

diff --git a/widget.h b/widget.h
index bc6a375..c9a9a8a 100644
--- a/widget.h
+++ b/widget.h
@@ -5,6 +5,7 @@ enum { LABEL_SIZE = 128 };
 typedef struct {
 	char buf[64];
 	double value;
+	int invalid;
 } w_Field;
 
 void w_init_field(w_Field *f);