From 2cdb6fdb13211372fbb5cca180f011488cbac93e Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sun, 8 Apr 2007 22:28:42 +0000
Subject: [PATCH] added mouse wheel support (patch 1696082)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45340 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 docs/changes.txt   |  4 ++++
 src/x11/window.cpp | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/docs/changes.txt b/docs/changes.txt
index 9256834e9e..74b77b8c3e 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -127,6 +127,10 @@ wxMSW:
 - Fixed infinite loop in wxThread::Wait() in console applications.
 - Return the restored window size from GetSize() when window is minimized.
 
+wxX11:
+
+- Added mouse wheel support (David Hart)
+
 
 2.8.4
 -----
diff --git a/src/x11/window.cpp b/src/x11/window.cpp
index 2ebaa57dfc..a2ea6261c2 100644
--- a/src/x11/window.cpp
+++ b/src/x11/window.cpp
@@ -1463,6 +1463,22 @@ bool wxTranslateMouseEvent(wxMouseEvent& wxevent, wxWindow *win, Window window,
                     eventType = wxEVT_RIGHT_DOWN;
                     button = 3;
                 }
+                else if ( xevent->xbutton.button == Button4 ||
+                            xevent->xbutton.button == Button5 )
+                {
+                    // this is the same value as used under wxMSW
+                    static const int WHEEL_DELTA = 120;
+
+                    eventType = wxEVT_MOUSEWHEEL;
+                    button = xevent->xbutton.button;
+
+                    wxevent.m_linesPerAction = 3;
+                    wxevent.m_wheelDelta = WHEEL_DELTA;
+
+                    // Button 4 means mousewheel up, 5 means down
+                    wxevent.m_wheelRotation = button == Button4 ? WHEEL_DELTA
+                                                                : -WHEEL_DELTA;
+                }
 
                 // check for a double click
                 // TODO: where can we get this value from?
-- 
2.45.2