package jalview.util;

import java.awt.Toolkit;
import java.awt.event.KeyEvent;

public class ShortcutKeyMaskExWrapper
{

  private static boolean init = false;

  private static final Float specversion = Float
          .parseFloat(System.getProperty("java.specification.version"));

  private static final float modern = 11;

  public static int SHIFT_DOWN_MASK = KeyEvent.SHIFT_DOWN_MASK;

  public static int ALT_DOWN_MASK = KeyEvent.ALT_DOWN_MASK;

  public ShortcutKeyMaskExWrapper()
  {
  }

  private static void init()
  {
    if (init)
    {
      return;
    }
    if (specversion < modern)
    {
      SHIFT_DOWN_MASK = KeyEvent.SHIFT_MASK;
      ALT_DOWN_MASK = KeyEvent.ALT_MASK;
    }
    else
    {
      SHIFT_DOWN_MASK = KeyEvent.SHIFT_DOWN_MASK;
      ALT_DOWN_MASK = KeyEvent.ALT_DOWN_MASK;
    }

    init = true;
  }

  public static int getMenuShortcutKeyMaskEx()
  {
    init();
    if (specversion < modern)
    {
      return Toolkit.getDefaultToolkit().getMenuShortcutKeyMask();
    }
    else
    {
      return Toolkit.getDefaultToolkit().getMenuShortcutKeyMaskEx();
    }
  }

}