Add dummy user_data field to XVirtualEvent, for improved upwards compatibility with Tk 8.5

2 files changed, 11 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index fb75794..8cf7f10 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2011-10-11  Jan Nijtmans  <nijtmans@users.sf.net>
+
+	* generic/tk.h:  Add dummy user_data field to
+	XVirtualEvent, for improved upwards compatibility
+	with Tk 8.5.
+
 2011-09-26  Jan Nijtmans  <nijtmans@users.sf.net>
 
 	* win/rules.vc:  Supporrt Visual Studio 11
diff --git a/generic/tk.h b/generic/tk.h
index f03992f..e777947 100644
--- a/generic/tk.h
+++ b/generic/tk.h
@@ -653,6 +653,10 @@ typedef struct Tk_GeomMgr {
  * the most information to the user.  The only difference is the changing
  * of the detail field for a virtual event so that it holds the name of the
  * virtual event being triggered.
+ *
+ * When using this structure, if you want your code to work correctly
+ * in Tk 8.5 as well, you should ensure that you zero out all the
+ * fields first using memset() or bzero().
  */
 
 typedef struct {
@@ -669,6 +673,7 @@ typedef struct {
     unsigned int state;	    /* key or button mask */
     Tk_Uid name;	    /* Name of virtual event. */
     Bool same_screen;	    /* same screen flag */
+    Tcl_Obj *user_data;		/* not used in Tk 8.4 */
 } XVirtualEvent;
 
 typedef struct {