FontMetrics metrics = getFontMetrics(getFont());
    private void setDefault()    {        FontMetrics metrics = getFontMetrics(getFont());        insetCache = getInsets();        fontHeight = metrics.getHeight();        knobControl = INITIAL;        pushKnobControl = INITIAL;        knobWidth = KNOB_WIDTH;        knobHeight = KNOB_HEIGHT;        calculatePreferredSize();    }