make IsEnabled() return false even if the window parent, and not the window itself, is disabled and added IsThisEnabled() implementing the old IsEnabled() behaviour; also significantly simplify the window state management code in all ports by factoring out the common parts in wxWindowBase

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45031 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk1/textctrl.cpp

@@ -690,32 +690,26 @@ void wxTextCtrl::SetEditable( bool editable )
     }
 }
 
-bool wxTextCtrl::Enable( bool enable )
+void wxTextCtrl::DoEnable( bool enable )
 {
-    if (!wxWindowBase::Enable(enable))
-    {
-        // nothing to do
-        return false;
-    }
-
     if (m_windowStyle & wxTE_MULTILINE)
     {
         gtk_text_set_editable( GTK_TEXT(m_text), enable );
-        OnParentEnable(enable);
     }
     else
     {
         gtk_widget_set_sensitive( m_text, enable );
     }
-
-    return true;
 }
 
 // wxGTK-specific: called recursively by Enable,
 // to give widgets an oppprtunity to correct their colours after they
 // have been changed by Enable
-void wxTextCtrl::OnParentEnable( bool enable )
+void wxTextCtrl::OnEnabled( bool enable )
 {
+    if ( IsSingleLine() )
+        return;
+
     // If we have a custom background colour, we use this colour in both
     // disabled and enabled mode, or we end up with a different colour under the
     // text.