SettingsPanel.java 文件源码

private Widget createAspectRatioListBox()
{
    final ListBox box = new ListBox();
    for (WCAspectRatio algo : WCAspectRatioRegistry.list())
        box.addItem(algo.getDescription(), algo.getId());

    box.setSelectedIndex(findIndex(box, setting.getAspectRatio().getId()));

    box.addChangeHandler(new ChangeHandler()
    {
        public void onChange(ChangeEvent event)
        {
            WCAspectRatio value = WCAspectRatioRegistry.getById(box.getValue(box.getSelectedIndex()));
            setting.setAspectRatio(value);
        }
    });

    box.setTitle("Desired aspect ratio of the drawing");

    return box;
}