/**
* Draw text via input method with composed text information. This method can draw texts with some
* underlines to illustrate converting characters.
*
* <p>This method is workaround for TextAreaPainter. Because, TextAreaPainter can't treat
* AttributedCharacterIterator directly. AttributedCharacterIterator has very important
* information when composing text. It has a map where are converted characters and committed
* characters. Ideally, changing TextAreaPainter method can treat AttributedCharacterIterator is
* better. But it's very tough!! So I choose to write some code as a workaround.
*
* <p>This draw method is proceeded with the following steps. 1. Original TextAreaPainter draws
* characters. 2. This refillComposedArea method erase previous paint characters by textarea's
* background color. The refill area is only square that width and height defined by characters
* with input method. 3. CompositionTextPainter.draw method paints composed text. It was actually
* drawn by TextLayout.
*
* @param gfx set TextAreaPainter's Graphics object.
* @param fillBackGroundColor set textarea's background.
*/
public void draw(Graphics gfx, Color fillBackGroundColor) {
assert (composedTextLayout != null);
Point composedLoc = getCaretLocation();
refillComposedArea(fillBackGroundColor, composedLoc.x, composedLoc.y);
composedTextLayout.draw((Graphics2D) gfx, composedLoc.x, composedLoc.y);
}
