From 57609509ca5e8649a6b838a0ded43ec908291319 Mon Sep 17 00:00:00 2001
From: "patthoyts@users.sourceforge.net" <patthoyts>
Date: Thu, 14 May 2009 12:04:40 +0000
Subject: [Bug 1923684]: backported checkbutton fix for confused state when
 -offvalue equals -tristatevalue

---
 ChangeLog          |  5 +++++
 generic/tkButton.c | 29 +++++++++++++++++++++++------
 2 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 28ff725..db35c67 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2009-05-14  Pat Thoyts  <patthoyts@users.sourceforge.net>
 
+	* generic/tkButton.c: [Bug 1923684]: backported checkbutton fix
+	for confused state when -offvalue equals -tristatevalue
+
+2009-05-14  Pat Thoyts  <patthoyts@users.sourceforge.net>
+
 	* doc/ttk_image.n:  Backported support for the Vista theme.
 	* doc/ttk_style.n:  This requires the vsapi element engine,
 	* doc/ttk_vsapi.n:  the hover state and the theme script
diff --git a/generic/tkButton.c b/generic/tkButton.c
index 334a54b..a132dd2 100644
--- a/generic/tkButton.c
+++ b/generic/tkButton.c
@@ -11,7 +11,7 @@
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tkButton.c,v 1.28 2007/12/13 15:24:13 dgp Exp $
+ * RCS: @(#) $Id: tkButton.c,v 1.28.2.1 2009/05/14 12:04:40 patthoyts Exp $
  */
 
 #include "tkInt.h"
@@ -1133,12 +1133,23 @@ ConfigureButton(
 	    butPtr->flags &= ~SELECTED;
             butPtr->flags &= ~TRISTATED;
 	    if (valuePtr != NULL) {
-		if (strcmp(Tcl_GetString(valuePtr),
-			Tcl_GetString(butPtr->onValuePtr)) == 0) {
+		const char *value = Tcl_GetString(valuePtr);
+		if (strcmp(value, Tcl_GetString(butPtr->onValuePtr)) == 0) {
 		    butPtr->flags |= SELECTED;
-		} else if (strcmp(Tcl_GetString(valuePtr),
+		} else if (strcmp(value,
                         Tcl_GetString(butPtr->tristateValuePtr)) == 0) {
-                    butPtr->flags |= TRISTATED;
+		    butPtr->flags |= TRISTATED;
+
+		    /*
+		     * For checkbuttons if the tristate value is the
+		     * same as the offvalue then prefer off to tristate
+		     */
+
+		    if (butPtr->offValuePtr
+			&& strcmp(value,
+			    Tcl_GetString(butPtr->offValuePtr)) == 0) {
+			butPtr->flags &= ~TRISTATED;
+		    }
                 }
 	    } else {
 		if (Tcl_ObjSetVar2(interp, namePtr, NULL,
@@ -1623,7 +1634,7 @@ ButtonVarProc(
 
     valuePtr = Tcl_GetVar2Ex(interp, name, NULL, TCL_GLOBAL_ONLY);
     if (valuePtr == NULL) {
-	value = "";
+	value = Tcl_GetString(butPtr->tristateValuePtr);
     } else {
 	value = Tcl_GetString(valuePtr);
     }
@@ -1633,6 +1644,12 @@ ButtonVarProc(
 	}
 	butPtr->flags |= SELECTED;
         butPtr->flags &= ~TRISTATED;
+    } else if (butPtr->offValuePtr 
+	&& strcmp(value, Tcl_GetString(butPtr->offValuePtr)) == 0) {
+	if (!(butPtr->flags & (SELECTED | TRISTATED))) {
+	    return NULL;
+	}
+	butPtr->flags &= ~(SELECTED | TRISTATED);
     } else if (strcmp(value, Tcl_GetString(butPtr->tristateValuePtr)) == 0) {
         if (butPtr->flags & TRISTATED) {
             return NULL;
-- 
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