FontChooser.java 文件源码

@Override
public void keyPressed(KeyEvent e) {
    switch (e.getKeyCode()) {
        case KeyEvent.VK_UP:
            int up = targetList.getSelectedIndex() - 1;
            if (up < 0) {
                up = 0;
            }
            targetList.setSelectedIndex(up);
            break;
        case KeyEvent.VK_DOWN:
            int listSize = targetList.getModel().getSize();
            int down = targetList.getSelectedIndex() + 1;
            if (down >= listSize) {
                down = listSize - 1;
            }
            targetList.setSelectedIndex(down);
            break;
        default:
            break;
    }
}