some refinement

common/elements/v1/buttons/options.go

@@ -3,16 +3,18 @@ package buttons
 import (
 	"image/color"
 
-	"git.vezzani.net/ben/games/common/elements/v1"
 	"git.vezzani.net/ben/games/common/elements/v1/blocks"
+	"git.vezzani.net/ben/games/common/elements/v1/core"
 	"git.vezzani.net/ben/games/common/elements/v1/mouse"
 )
 
 type OptFunc func(button *Button)
 
-func Core(f elements.OptFunc) OptFunc {
+func Core(fs ...core.OptFunc) OptFunc {
 	return func(b *Button) {
-		f(&b.Core)
+		for _, f := range fs {
+			f(&b.Element)
+		}
 	}
 }