package gve.calc.formula;

 The AWT-minded CursorLabel class is adapted more to our
  purposes here: we implement a few interfaces and when the cursor
  enters or leaves, we invalidate ourself. 
public class CursorPosLabel extends CursorLabel implements HasCursorPos,HasBaseline {
	public CursorPosLabel(String str) {
		super(str);
	}

	public CursorPosLabel(String str,int pos) {
		super(str,pos);
	}

	public void activate() {}

	public void deactivate() {
		super.setCursorPos(-1);
		invalidate();
	}

	public int getBaseline() {
//if (getFont() == null) return 5;
		return getFontMetrics(getFont()).getAscent();
	}

	public void setCursorPos(int pos) {
		if (pos >= 0) {
			if (super.getCursorPos() < 0) invalidate();
			super.setCursorPos(pos);
			return;
		}
		invalidate();
		switch (pos) {
		default:
		case Somewhere_LEFT:
			super.setCursorPos(0); return;
		case Somewhere_RIGHT:
			super.setCursorPos(getText().length()); return;
		case Somewhere_NOWHERE:
			super.setCursorPos(-1); return;
		}
	}
}