From 8c6c8df8f4bd07602931485956fce524925dc2bb Mon Sep 17 00:00:00 2001
From: Simon Tatham <anakin@pobox.com>
Date: Sat, 2 Apr 2011 15:36:30 +0000
Subject: Add functions provided by the midend to tell a front end whether GUI
 buttons for undo and redo should currently be greyed out.

[originally from svn r9139]
---
 midend.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'midend.c')

diff --git a/midend.c b/midend.c
index 05ea663..300e2bf 100644
--- a/midend.c
+++ b/midend.c
@@ -428,6 +428,16 @@ void midend_new_game(midend *me)
     me->pressed_mouse_button = 0;
 }
 
+int midend_can_undo(midend *me)
+{
+    return (me->statepos > 1);
+}
+
+int midend_can_redo(midend *me)
+{
+    return (me->statepos < me->nstates);
+}
+
 static int midend_undo(midend *me)
 {
     if (me->statepos > 1) {
-- 
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