made wxPanel be auto layout aware

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

include/wx/generic/panelg.h

@@ -78,6 +78,8 @@ public:
         // set the focus to the first child if we get it
     void OnFocus(wxFocusEvent& event);
 
+    void OnSize(wxSizeEvent& event);
+
         // called by wxWindow whenever it gets focus
     void SetLastFocus(wxWindow *win) { m_winLastFocused = win; }
     wxWindow *GetLastFocus() const { return m_winLastFocused; }

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
@@ -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 )