implemented text styles for GTK+

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@10610 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/textctrl.h

@@ -80,10 +80,17 @@ public:
     bool HasBackgroundColour() const { return m_colBack.Ok(); }
     bool HasFont() const { return m_font.Ok(); }
 
+    // setters
     const wxColour& GetTextColour() const { return m_colText; }
     const wxColour& GetBackgroundColour() const { return m_colBack; }
     const wxFont& GetFont() const { return m_font; }
 
+    // returns false if we have any attributes set, true otherwise
+    bool IsDefault() const
+    {
+        return !HasTextColour() && !HasBackgroundColour() && !HasFont();
+    }
+
 private:
     wxColour m_colText,
              m_colBack;