[PATCH] gitk: Added support for OS X mouse wheel

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MacBook doesn't seem to recognize MouseRelease-4 and -5 events, at all.
So i added a support for the MouseWheel event, which i limited to Tcl/tk
aqua, as i couldn't test it neither on Linux or Windows. Tcl/tk needs to
be updated from the version that is shipped with OS X 10.4 Tiger, for
this patch to work.

Signed-off-by: Väinö Järvelä <v@xxxxxxxxxx>
---
gitk |    6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/gitk b/gitk
index f74ce51..985c30a 100755
--- a/gitk
+++ b/gitk
@@ -825,6 +825,12 @@ proc makewindow {} {
     #bindall <B1-Motion> {selcanvline %W %x %y}
     bindall <ButtonRelease-4> "allcanvs yview scroll -5 units"
     bindall <ButtonRelease-5> "allcanvs yview scroll 5 units"
+    if {[tk windowingsystem] eq "aqua"} {
+        bindall <MouseWheel> {
+                set delta [expr {- (%D)}]
+                allcanvs yview scroll $delta units
+        }
+    }
     bindall <2> "canvscan mark %W %x %y"
     bindall <B2-Motion> "canvscan dragto %W %x %y"
     bindkey <Home> selfirstline
--
1.5.2

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