X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/655719367ac5e131d9642e5783f3ecf64d1a3385..d45318b8b6857ab6159b37c2f3ddce6a5f68be28:/src/generic/vscroll.cpp?ds=sidebyside

diff --git a/src/generic/vscroll.cpp b/src/generic/vscroll.cpp
index ad0951f3a7..d8d57b6e97 100644
--- a/src/generic/vscroll.cpp
+++ b/src/generic/vscroll.cpp
@@ -37,6 +37,9 @@
 BEGIN_EVENT_TABLE(wxVScrolledWindow, wxPanel)
     EVT_SIZE(wxVScrolledWindow::OnSize)
     EVT_SCROLLWIN(wxVScrolledWindow::OnScroll)
+#if wxUSE_MOUSEWHEEL
+    EVT_MOUSEWHEEL(wxVScrolledWindow::OnMouseWheel)
+#endif
 END_EVENT_TABLE()
 
 
@@ -60,6 +63,10 @@ void wxVScrolledWindow::Init()
     m_nVisible = 1;
 
     m_heightTotal = 0;
+
+#if wxUSE_MOUSEWHEEL
+    m_sumWheelRotation = 0;
+#endif
 }
 
 // ----------------------------------------------------------------------------
@@ -407,7 +414,7 @@ void wxVScrolledWindow::OnScroll(wxScrollWinEvent& event)
     {
         lineFirstNew = event.GetPosition();
     }
-        
+
     else // unknown scroll event?
     {
         wxFAIL_MSG( _T("unknown scroll event type?") );
@@ -421,3 +428,25 @@ void wxVScrolledWindow::OnScroll(wxScrollWinEvent& event)
 #endif // __WXMAC__
 }
 
+#if wxUSE_MOUSEWHEEL
+
+void wxVScrolledWindow::OnMouseWheel(wxMouseEvent& event)
+{
+    m_sumWheelRotation += event.GetWheelRotation();
+    int delta = event.GetWheelDelta();
+
+    // how much to scroll this time
+    int units_to_scroll = -(m_sumWheelRotation/delta);
+    if ( !units_to_scroll )
+        return;
+
+    m_sumWheelRotation += units_to_scroll*delta;
+
+    if ( !event.IsPageScroll() )
+        ScrollLines( units_to_scroll*event.GetLinesPerAction() );
+    else
+        // scroll pages instead of lines
+        ScrollPages( units_to_scroll );
+}
+
+#endif