WindowsLookAndFeel.java 文件源码

/**
 * {@inheritDoc}
 *
 * @since 1.6
 */
public Icon getDisabledIcon(JComponent component, Icon icon) {
    // if the component has a HI_RES_DISABLED_ICON_CLIENT_KEY
    // client property set to Boolean.TRUE, then use the new
    // hi res algorithm for creating the disabled icon (used
    // in particular by the WindowsFileChooserUI class)
    if (icon != null
            && component != null
            && Boolean.TRUE.equals(component.getClientProperty(HI_RES_DISABLED_ICON_CLIENT_KEY))
            && icon.getIconWidth() > 0
            && icon.getIconHeight() > 0) {
        BufferedImage img = new BufferedImage(icon.getIconWidth(),
                icon.getIconWidth(), BufferedImage.TYPE_INT_ARGB);
        icon.paintIcon(component, img.getGraphics(), 0, 0);
        ImageFilter filter = new RGBGrayFilter();
        ImageProducer producer = new FilteredImageSource(img.getSource(), filter);
        Image resultImage = component.createImage(producer);
        return new ImageIconUIResource(resultImage);
    }
    return super.getDisabledIcon(component, icon);
}