X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/2feed0044e8c8c99667da7bf8ecca52c4c707c05..94e2ed3b8db0220160c0b939782cd46914ec073a:/src/generic/scrlwing.cpp?ds=sidebyside

diff --git a/src/generic/scrlwing.cpp b/src/generic/scrlwing.cpp
index e3149ab601..ce07d296b2 100644
--- a/src/generic/scrlwing.cpp
+++ b/src/generic/scrlwing.cpp
@@ -273,6 +273,8 @@ wxScrollHelper::~wxScrollHelper()
 
     if ( m_targetWindow )
         m_targetWindow->PopEventHandler(TRUE /* do delete it */);
+    if ( m_win && m_win != m_targetWindow)
+        m_win->PopEventHandler(TRUE /* do delete it */);
 }
 
 // ----------------------------------------------------------------------------
@@ -358,7 +360,17 @@ void wxScrollHelper::SetScrollbars(int pixelsPerUnitX,
 void wxScrollHelper::SetTargetWindow( wxWindow *target )
 {
     wxASSERT_MSG( target, wxT("target window must not be NULL") );
+    // FIXME: There is a potential problem with this way of deleting
+    // event handlers, basically you can not be sure that you delete
+    // the event handler that was create by this wxScrollHelper.
+    // Remove the old event handler from the previous target scroll window.
+    if (m_targetWindow && m_targetWindow != m_win)
+        m_targetWindow->PopEventHandler(TRUE /* Delete old event handler*/);
     m_targetWindow = target;
+    // Install a new event handler, which will intercept the events we're
+    // interested in from the target scroll window.
+    if (m_targetWindow != m_win)
+        m_targetWindow->PushEventHandler(new wxScrollHelperEvtHandler(this));
 }
 
 wxWindow *wxScrollHelper::GetTargetWindow() const
@@ -978,9 +990,24 @@ void wxScrollHelper::HandleOnMouseWheel(wxMouseEvent& event)
     {
         lines *= event.GetLinesPerAction();
 
-        int vsx, vsy;
-        GetViewStart(&vsx, &vsy);
-        Scroll(-1, vsy - lines);
+        wxScrollWinEvent newEvent;
+
+        newEvent.SetPosition(0);
+        newEvent.SetOrientation(wxVERTICAL);
+        newEvent.m_eventObject = m_win;
+        if (lines > 0)
+            newEvent.m_eventType = wxEVT_SCROLLWIN_LINEUP;
+        else
+            newEvent.m_eventType = wxEVT_SCROLLWIN_LINEDOWN;
+
+        int times = abs(lines);
+        for (; times > 0; times --)
+            m_win->GetEventHandler()->ProcessEvent(newEvent);
+
+        /* Old Way */
+        // int vsx, vsy;
+        // GetViewStart(&vsx, &vsy);
+        // Scroll(-1, vsy - lines);
     }
 }