+ /**
+ * Draw a string and enclose it inside a rectangle. If
+ * back color is specified, the background is cleared with
+ * the given color. If frame is specified, a thin frame is drawn
+ * around the text with the given color.
+ */
+ virtual void rectText(int x, int baseline, docstring const & str,
+ FontInfo const & font, ColorCode back, ColorCode frame);
+
+ /// draw a filled rectangle with the shape of a 3D button
+ virtual void button(int x, int y, int w, int h, bool mouseHover);
+
+ /// draw a character of a preedit string for cjk support.
+ virtual int preeditText(int x, int y,
+ char_type c, FontInfo const & f, preedit_style style);
+