From af4088f1bebd177c33a085f892062fd1d5c64d88 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sun, 2 Dec 2001 15:04:38 +0000
Subject: [PATCH] fixed event processing for the target window

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@12822 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 include/wx/scrolwin.h    |  4 ++--
 src/generic/scrlwing.cpp | 26 +++++++++++++-------------
 2 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/include/wx/scrolwin.h b/include/wx/scrolwin.h
index 8bf0404a25..0894cd920b 100644
--- a/include/wx/scrolwin.h
+++ b/include/wx/scrolwin.h
@@ -80,7 +80,7 @@ public:
     // occasions you might want it to scroll [part of] another window (e.g. a
     // child of it in order to scroll only a portion the area between the
     // scrollbars (spreadsheet: only cell area will move).
-    virtual void SetTargetWindow(wxWindow *target, bool pushEventHandler = FALSE);
+    virtual void SetTargetWindow(wxWindow *target);
     virtual wxWindow *GetTargetWindow() const;
 
     void SetTargetRect(const wxRect& rect) { m_rectToScroll = rect; }
@@ -146,7 +146,7 @@ protected:
 
     // change just the target window (unlike SetWindow which changes m_win as
     // well)
-    void DoSetTargetWindow(wxWindow *target, bool pushEventHandler = FALSE);
+    void DoSetTargetWindow(wxWindow *target);
 
     // delete the event handler we installed
     void DeleteEvtHandler();
diff --git a/src/generic/scrlwing.cpp b/src/generic/scrlwing.cpp
index b1849b2589..8aec5d087e 100644
--- a/src/generic/scrlwing.cpp
+++ b/src/generic/scrlwing.cpp
@@ -384,15 +384,15 @@ void wxScrollHelper::SetScrollbars(int pixelsPerUnitX,
 }
 
 // ----------------------------------------------------------------------------
-// target window handling
+// [target] window handling
 // ----------------------------------------------------------------------------
 
 void wxScrollHelper::DeleteEvtHandler()
 {
     // FIXME: we should search for m_handler in the handler list
-    if ( m_targetWindow )
+    if ( m_win )
     {
-        m_targetWindow->PopEventHandler(TRUE /* Delete old event handler*/);
+        m_win->PopEventHandler(TRUE /* Delete old event handler*/);
     }
 }
 
@@ -402,33 +402,32 @@ void wxScrollHelper::SetWindow(wxWindow *win)
 
     m_win = win;
 
-    DoSetTargetWindow(win, TRUE);
+    // by default, the associated window is also the target window
+    DoSetTargetWindow(win);
 }
 
-void wxScrollHelper::DoSetTargetWindow(wxWindow *target, bool pushEventHandler)
+void wxScrollHelper::DoSetTargetWindow(wxWindow *target)
 {
     m_targetWindow = target;
 
     // install the event handler which will intercept the events we're
-    // interested in
-    if (pushEventHandler)
+    // interested in (but only do it for our real window, not the target window
+    // which we scroll - we don't need to hijack its events)
+    if ( m_targetWindow == m_win )
     {
         m_handler = new wxScrollHelperEvtHandler(this);
         m_targetWindow->PushEventHandler(m_handler);
     }
 }
 
-void wxScrollHelper::SetTargetWindow( wxWindow *target, bool pushEventHandler )
+void wxScrollHelper::SetTargetWindow(wxWindow *target)
 {
     wxCHECK_RET( target, wxT("target window must not be NULL") );
 
     if ( target == m_targetWindow )
         return;
 
-    if (pushEventHandler)
-        DeleteEvtHandler();
-
-    DoSetTargetWindow(target, pushEventHandler);
+    DoSetTargetWindow(target);
 }
 
 wxWindow *wxScrollHelper::GetTargetWindow() const
@@ -839,7 +838,8 @@ void wxScrollHelper::HandleOnSize(wxSizeEvent& WXUNUSED(event))
 // scroll position
 void wxScrollHelper::HandleOnPaint(wxPaintEvent& WXUNUSED(event))
 {
-    wxPaintDC dc(m_targetWindow);
+    // don't use m_targetWindow here, this is always called for ourselves
+    wxPaintDC dc(m_win);
     DoPrepareDC(dc);
 
     OnDraw(dc);