FontUtil.java 文件源码

/**
 * Converts the font of the control by adding a single style bit, unless the font already have
 * that style.
 * <p>
 * If the font is converted, it will attach a {@link DisposeListener}
 * to the <code>control</code> to dispose the font when it's not needed anymore.
 * <p>
 * <em>If converting fonts is a frequent operation, this method will create
 * several {@link DisposeListener}s that can lead to high resource allocation</em>
 *
 * @param control whose font will be changed
 * @param style e.g. SWT.BOLD or SWT.ITALIC
 */
public static void convertFont(Control control, int style) {
  for (FontData fontData : control.getFont().getFontData()) {
    if (hasStyle(fontData, style)) {
      return;
    }
  }
  FontDescriptor fontDescriptor = FontDescriptor.createFrom(control.getFont()).setStyle(style);
  final Font newFont = fontDescriptor.createFont(control.getDisplay());
  control.setFont(newFont);
  control.addDisposeListener(new DisposeListener() {
    @Override
    public void widgetDisposed(DisposeEvent event) {
      newFont.dispose();
    }
  });
}