From 5d9ff677c085940a14a451132e3e014f328c2cee Mon Sep 17 00:00:00 2001
From: Alessandro Ranellucci <aar@cpan.org>
Date: Thu, 25 Dec 2014 19:51:53 +0100
Subject: [PATCH] Workaround wxMSW not catching mouse wheel events if panel has
 no focus. #2424

---
 lib/Slic3r/GUI/PreviewCanvas.pm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/Slic3r/GUI/PreviewCanvas.pm b/lib/Slic3r/GUI/PreviewCanvas.pm
index 7ff0075acf..436854d36d 100644
--- a/lib/Slic3r/GUI/PreviewCanvas.pm
+++ b/lib/Slic3r/GUI/PreviewCanvas.pm
@@ -118,7 +118,10 @@ sub mouse_event {
     my ($self, $e) = @_;
     
     my $pos = Slic3r::Pointf->new($e->GetPositionXY);
-    if ($e->LeftDClick) {
+    if ($e->Entering && &Wx::wxMSW) {
+        # wxMSW needs focus in order to catch mouse wheel events
+        $self->SetFocus;
+    } elsif ($e->LeftDClick) {
         $self->on_double_click->()
             if $self->on_double_click;
     } elsif ($e->LeftDown || $e->RightDown) {