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-rw-r--r--win/tkWinKey.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/win/tkWinKey.c b/win/tkWinKey.c
index f197e5a..e8833fa 100644
--- a/win/tkWinKey.c
+++ b/win/tkWinKey.c
@@ -9,7 +9,7 @@
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tkWinKey.c,v 1.10 2000/04/15 00:33:08 ericm Exp $
+ * RCS: @(#) $Id: tkWinKey.c,v 1.11 2000/04/15 02:50:26 ericm Exp $
*/
#include "tkWinInt.h"
@@ -264,9 +264,29 @@ KeycodeToKeysym(keycode, state, noascii)
/*
* Keycode mapped to a valid Latin-1 character. Since the keysyms
* for alphanumeric characters map onto Latin-1, we just return it.
+ *
+ * We treat 0x7F as a special case mostly for backwards compatibility.
+ * In older versions of Tk, Control-Backspace returned "XK_BackSpace"
+ * as the X Keysym. This was due to the fact that we did not
+ * initialize the keys array properly when we passed it to ToAscii, above.
+ * We had previously not been setting the state bit for the Control key.
+ * When we fixed that, we found that Control-Backspace on Windows is
+ * interpreted as ASCII-127 (0x7F), which corresponds to the Delete key.
+ *
+ * Upon discovering this, we realized we had two choices: return XK_Delete
+ * or return XK_BackSpace. If we returned XK_Delete, that could be
+ * considered "more correct" (although the correctness would be dependant
+ * on whether you believe that ToAscii is doing the right thing in that
+ * case); however, this would break backwards compatibility, and worse,
+ * it would limit application programmers -- they would effectively be
+ * unable to bind to <Control-Backspace> on Windows. We therefore chose
+ * instead to return XK_BackSpace (handled here by letting the code
+ * "fall-through" to the return statement below, which works because the
+ * keycode for this event is VK_BACKSPACE, and the keymap table maps that
+ * keycode to XK_BackSpace).
*/
- if (result == 1 && UCHAR(buf[0]) >= 0x20) {
+ if (result == 1 && UCHAR(buf[0]) >= 0x20 && UCHAR(buf[0]) != 0x7F) {
return (KeySym) UCHAR(buf[0]);
}