made wxPanel be auto layout aware

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4075 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/panelg.cpp

@@ -36,6 +36,7 @@ BEGIN_EVENT_TABLE(wxPanel, wxWindow)
   EVT_SYS_COLOUR_CHANGED(wxPanel::OnSysColourChanged)
   EVT_SET_FOCUS(wxPanel::OnFocus)
   EVT_NAVIGATION_KEY(wxPanel::OnNavigationKey)
+  EVT_SIZE(wxPanel::OnSize)
 END_EVENT_TABLE()
 
 #endif
@@ -101,7 +102,7 @@ void wxPanel::OnNavigationKey( wxNavigationKeyEvent& event )
     wxWindow *winFocus = event.GetCurrentFocus();
     if (!winFocus)
         winFocus = wxWindow::FindFocus();
-	
+
     if (!winFocus)
     {
         event.Skip();
@@ -132,7 +133,7 @@ void wxPanel::OnNavigationKey( wxNavigationKeyEvent& event )
 	        // we don't want to tab into a different dialog or frame
 	        if ( focussed_child_of_p->IsTopLevel() )
 		    break;
-		    
+
                 if ( wxDynamicCast(p, wxPanel) )
                 {
 		    event.SetCurrentFocus( focussed_child_of_p );
@@ -166,6 +167,14 @@ void wxPanel::OnNavigationKey( wxNavigationKeyEvent& event )
     event.Skip();
 }
 
+
+void wxPanel::OnSize(wxSizeEvent& WXUNUSED(event))
+{
+#if wxUSE_CONSTRAINTS
+    if (GetAutoLayout()) Layout();
+#endif
+}
+
 void wxPanel::OnFocus(wxFocusEvent& event)
 {
     if ( m_winLastFocused )