added wxDisplay::GetClientArea() (currently implemented for single display and MSW implementations only)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38147 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/dpycmn.cpp

@@ -68,6 +68,8 @@ public:
         return r;
     }
 
+    virtual wxRect GetClientArea() const { return wxGetClientDisplayRect(); }
+
     virtual wxString GetName() const { return wxString(); }
 
 #if wxUSE_DISPLAY
@@ -162,6 +164,13 @@ wxRect wxDisplay::GetGeometry() const
     return m_impl->GetGeometry();
 }
 
+wxRect wxDisplay::GetClientArea() const
+{
+    wxCHECK_MSG( IsOk(), wxRect(), _T("invalid wxDisplay object") );
+
+    return m_impl->GetClientArea();
+}
+
 wxString wxDisplay::GetName() const
 {
     wxCHECK_MSG( IsOk(), wxString(), _T("invalid wxDisplay object") );