MotifScrollPaneUI.java 文件源码

private PropertyChangeListener createPropertyChangeHandler() {
    return new PropertyChangeListener() {
        @Override
        public void propertyChange(PropertyChangeEvent e) {
              String propertyName = e.getPropertyName();

              if (propertyName.equals("componentOrientation")) {
                    JScrollPane pane = (JScrollPane)e.getSource();
                    JScrollBar vsb = pane.getVerticalScrollBar();
                    if (vsb != null && vsbBorder != null &&
                        vsb.getBorder() == vsbBorder) {
                        // The Border on the verticall scrollbar matches
                        // what we installed, reset it.
                        if (MotifGraphicsUtils.isLeftToRight(pane)) {
                            vsbBorder = new CompoundBorder(vsbMarginBorderR,
                                            vsbBorder.getInsideBorder());
                        } else {
                            vsbBorder = new CompoundBorder(vsbMarginBorderL,
                                            vsbBorder.getInsideBorder());
                        }
                        vsb.setBorder(vsbBorder);
                    }
              }
    }};
}