From d4655020f96f7e3d9de9a994af63d5455c429ae0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?M=C3=A1rio=20Luzerio?= <mrluzeiro@ua.pt>
Date: Wed, 2 Mar 2016 07:50:32 +1100
Subject: [PATCH] Fix zoom issue on MSWin (wxCanvas requires focus)

---
 3d-viewer/3d_cache/dialogs/panel_prev_model.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/3d-viewer/3d_cache/dialogs/panel_prev_model.cpp b/3d-viewer/3d_cache/dialogs/panel_prev_model.cpp
index a43996e730..ede4187117 100644
--- a/3d-viewer/3d_cache/dialogs/panel_prev_model.cpp
+++ b/3d-viewer/3d_cache/dialogs/panel_prev_model.cpp
@@ -508,12 +508,18 @@ void PANEL_PREV_3D::UpdateModelName( wxString const& aModelName )
         preview->SetSizer( ws );
         preview->Layout();
         ws->FitInside( preview );
+
+        // Fixes bug in Windows (XP and possibly others) where the canvas requires the focus
+        // in order to receive mouse events.  Otherwise, the user has to click somewhere on
+        // the canvas before it will respond to mouse wheel events.
+        canvas->SetFocus();
         return;
     }
 
     canvas->Set3DModel( *model );
     canvas->Refresh();
     canvas->Update();
+    canvas->SetFocus();
 
     return;
 }