From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sun, 12 Dec 2004 19:44:52 +0000 (+0000)
Subject: added MSWGetDefaultBgBrush() to allow some derived classes to use transparent brush... 
X-Git-Url: https://git.saurik.com/wxWidgets.git/commitdiff_plain/d34e375c9c54f7fc655de69591dee4d5f8bb7193

added MSWGetDefaultBgBrush() to allow some derived classes to use transparent brush for erasing background


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30969 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---

diff --git a/include/wx/msw/control.h b/include/wx/msw/control.h
index 574d84a74b..960c3a9948 100644
--- a/include/wx/msw/control.h
+++ b/include/wx/msw/control.h
@@ -133,6 +133,15 @@ protected:
     // common part of the 3 methods above
     WXHBRUSH MSWControlColorSolid(WXHDC pDC, wxColour colBg);
 
+    // another WM_CTLCOLOR-related function: override this to return the brush
+    // which should be used to paint the control background by default
+    //
+    // for most controls, the default behaviour of returning 0 and letting the
+    // system do it is correct, but for some -- e.g. checkboxes -- we actually
+    // have to return transparent brush from here to prevent the system from
+    // overwriting background with solid colour
+    virtual WXHBRUSH MSWGetDefaultBgBrush() { return 0; }
+
     // this is a helper for the derived class GetClassDefaultAttributes()
     // implementation: it returns the right colours for the classes which
     // contain something else (e.g. wxListBox, wxTextCtrl, ...) instead of
diff --git a/src/msw/control.cpp b/src/msw/control.cpp
index fa80b56493..7dc54a5114 100644
--- a/src/msw/control.cpp
+++ b/src/msw/control.cpp
@@ -382,7 +382,7 @@ WXHBRUSH wxControl::MSWControlColor(WXHDC pDC)
 #endif // wxUSE_UXTHEME
 
     // let the control deal with background itself
-    return 0;
+    return MSWGetDefaultBgBrush();
 }
 
 WXHBRUSH wxControl::MSWControlColorDisabled(WXHDC pDC)