javax.swing.JMenuBar#getMenuCount ( )源码实例Demo

/**
 * On Mac often the menus won't really update without this hack-ish twist:
 * remove the menu and re-add it. Voila! It's both unnecessary and crucial
 * at the same time.
 * 
 * @param f
 *            the frame whose menubar you need to update.
 * @param menu
 *            the menu you need to update.
 */
static void fixMenuBar(JFrame f, JMenu menu) {
	JMenuBar mb = f.getJMenuBar();
	if (mb != null) {
		JMenu[] menus = new JMenu[mb.getMenuCount()];
		for (int a = 0; a < menus.length; a++) {
			menus[a] = mb.getMenu(a);
		}

		boolean found = false;
		List<JMenu> menusToAdd = new ArrayList<>();
		for (int a = 0; a < menus.length; a++) {
			if (menus[a] == menu)
				found = true;

			if (found) {
				mb.remove(menus[a]);
				menusToAdd.add(menus[a]);
			}
		}
		for (JMenu menuToAdd : menusToAdd) {
			mb.add(menuToAdd);
		}
	}
}
 

@Override
public void addNotify() {
    super.addNotify();

    float size = Driver.getFontSize();

    JMenuBar menubar = getJMenuBar();
    if (menubar != null) {
        menubar.setFont(menubar.getFont().deriveFont(size));
        for (int i = 0; i < menubar.getMenuCount(); i++) {
            for (int j = 0; j < menubar.getMenu(i).getMenuComponentCount(); j++) {
                Component temp = menubar.getMenu(i).getMenuComponent(j);
                temp.setFont(temp.getFont().deriveFont(size));
            }
        }
        mainFrameTree.updateFonts(size);
    }
}
 

/**
 * Enables and disables the menu bars in DrawingFrames and DrawingFrame3D.
 *
 * Usually invoked when a model is initialized but may be invoked at other times.
 */
public static void enableMenubars(boolean enable) {
  Frame[] frames = Frame.getFrames();
  for(int i = 0; i<frames.length; i++) {
    if(!frames[i].isDisplayable()) {
      continue;
    }
    if((frames[i].getName()!=null)&&(frames[i].getName().indexOf("Tool")>-1)) {       //$NON-NLS-1$
      continue;
    }
    Class<?> frame3d = null;
    try {
      frame3d = Class.forName("org.opensourcephysics.display3d.core.DrawingFrame3D"); //$NON-NLS-1$
    } catch(ClassNotFoundException ex) {}
    if(DrawingFrame.class.isInstance(frames[i])||((frame3d!=null)&&frame3d.isInstance(frames[i]))) {
      JMenuBar bar = ((JFrame) frames[i]).getJMenuBar();
      if(bar!=null) {
        for(int j = 0, n = bar.getMenuCount(); j<n; j++) {
          bar.getMenu(j).setEnabled(enable);
        }
      }
    }
  }
}
 

/**
 * Gets a menu with the given name from the menu bar.  Returns null if menu item does not exist.
 *
 * @param menuName String
 * @return JMenu
 */
public JMenu getMenu(String menuName) {
  JMenuBar menuBar = getJMenuBar();
  if(menuBar==null) {
    return null;
  }
  menuName = menuName.trim();
  JMenu menu = null;
  for(int i = 0; i<menuBar.getMenuCount(); i++) {
    JMenu next = menuBar.getMenu(i);
    if(next.getText().trim().equals(menuName)) {
      menu = next;
      break;
    }
  }
  return menu;
}
 

/**
 * Removes a menu with the given name from the menu bar and returns the removed item.
 * Returns null if menu item does not exist.
 *
 * @param menuName String
 * @return JMenu
 */
public JMenu removeMenu(String menuName) {
  JMenuBar menuBar = getJMenuBar();
  if(menuBar==null) {
    return null;
  }
  menuName = menuName.trim();
  JMenu menu = null;
  for(int i = 0; i<menuBar.getMenuCount(); i++) {
    JMenu next = menuBar.getMenu(i);
    if(next.getText().trim().equals(menuName)) {
      menu = next;
      menuBar.remove(i);
      break;
    }
  }
  return menu;
}
 

public void update() {
	JMenuBar menuBar = menuBarMgr.getMenuBar();
	if (menuBar.getMenuCount() > 0) {
		node.setMenuBar(menuBar);
	}

	node.setToolBar(toolBarMgr.getToolBar());
	node.validate();
}
 

public static void setMnemonics(final JMenuBar menuBar) {
    final int c = menuBar.getMenuCount();
    final ArrayList<JMenuItem> list = new ArrayList<JMenuItem>(c);
    for (int i = 0; i < c; i++)
        list.add(menuBar.getMenu(i));
    setMnemonics(list);
}
 

public static int findMenuPosition(JMenuBar menuBar, String name) {
    int n = menuBar.getMenuCount();
    for (int i = 0; i < n; i++) {
        JMenu menu = menuBar.getMenu(i);
        if (name.equals(menu.getName())) {
            return i;
        }
    }
    return -1;
}