java - JMenuBar 可见后更新 JMenu 和 JMenu 字体

Question

下面的代码创建了一个简单的 GUI，中间有一个按钮，单击该按钮后，应更新 JMenuBar 组件的字体。为此，setMyFont 方法会在 JButton 上的 ActionListener 中触发。然而，经过几次列出的尝试后，我未能完成此任务，但我不知道为什么。 setMyFont中使用的代码如下

public void setMyFont(Font f, Font f2) {
    //Attempt 1 in the hope it would autodetect that font
    //had changed and just update
    menuFont = f;
    menuItemFont = f2;

    //Attempt 2 in the hope on the repaint it would update 
    //the font with the new UIManager properties
    UIManager.put("Menu.font", menuFont);
    UIManager.put("MenuItem.font", menuItemFont);

    //Attempt 3 in the hope that going over each component 
    //individually would update the font
    for(Component comp: getComponents()) {
        if(comp instanceof JMenu) {
            comp.setFont(menuFont);
        } else {
            comp.setFont(menuItemFont);
        }
    }

    validate();
    repaint();
}

使用当前代码的组件上的字体没有更新是否有原因？另外，即使组件已经创建，我如何更改代码以允许字体更新？

<小时/>

SSCCE 完整代码

import java.awt.Component;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.UIManager;

public class Main extends JFrame {
    private static final long serialVersionUID = 3206847208968227199L;
    JButton but;
    MenuBar mB;

    private Main() {
        setSize(600, 600);

        mB = new MenuBar();
        setJMenuBar(new MenuBar());

        but = new JButton("Change Font");
        but.addActionListener(new CustomActionListener());
        add(but);

        setVisible(true);
        setLocationRelativeTo(null);
    }

    public static void main(String[] args) {
        new Main();
    }

    private class MenuBar extends JMenuBar {
        private static final long serialVersionUID = -2055260049565317972L;
        Font menuFont = new Font("Courier", Font.ITALIC + Font.BOLD, 12);
        Font menuItemFont = new Font("sans-serif", 0, 12);
        JMenu menu, subMenu;

        MenuBar() {
            UIManager.put("Menu.font", menuFont);
            UIManager.put("MenuItem.font", menuItemFont);

            menu = new JMenu("Menu");

            subMenu = new JMenu("Sub Menu");
            subMenu.add(new JMenuItem("Sub Item"));
            subMenu.add(new JMenu("Sub Menu"));
            menu.add(subMenu);

            menu.add(new JMenuItem("Sub Item"));
            menu.add(new JMenu("Sub Menu"));

            add(menu);

            menu = new JMenu("Another Menu");
            menu.add(new JMenu("Sub Menu"));
            menu.add(new JMenuItem("Sub Item"));
            menu.add(new JMenu("Sub Menu"));
            add(menu);
        }

        public void setMyFont(Font f, Font f2) {
            //Attempt 1 in the hope it would autodetect that font
            //had changed and just update
            menuFont = f;
            menuItemFont = f2;

            //Attempt 2 in the hope on the repaint it would update 
            //the font with the new UIManager properties
            UIManager.put("Menu.font", menuFont);
            UIManager.put("MenuItem.font", menuItemFont);

            //Attempt 3 in the hope that going over each component 
            //individually would update the font
            for(Component comp: getComponents()) {
                if(comp instanceof JMenu) {
                    comp.setFont(menuFont);
                } else {
                    comp.setFont(menuItemFont);
                }
            }

            validate();
            repaint();
        }
    }

    private class CustomActionListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            mB.setMyFont(new Font("sans-serif", 0, 12), new Font("Courier", Font.ITALIC + Font.BOLD, 12));
        }
    }
}

Answer 1

1. 设置字体后，您需要让层次结构中的每个组件调用更新其 UI - SwingUtilities为此有一个方便的方法

   UIManager.put("Menu.font",  menuFont);
   SwingUtilities.updateComponentTreeUI( Main.this );
   

2. 使用FontUIResource类例如

   FontUIResource menuFont = new FontUIResource("Courier", Font.ITALIC + Font.BOLD, 12);
   

以下代码改编自已发布的 SSCCE，适用于我:

import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.plaf.FontUIResource;

public class Main extends JFrame {
    private static final long serialVersionUID = 3206847208968227199L;
    JButton but;
    MenuBar mB;

    private Main() {
        setSize(600, 600);

        mB = new MenuBar();
        setJMenuBar(mB);

        but = new JButton("Change Font");
        but.addActionListener(new CustomActionListener());
        add(but);

        setVisible(true);
        setLocationRelativeTo(null);
    }

    public static void main(String[] args) {
        new Main();
    }

    private class MenuBar extends JMenuBar {
        private static final long serialVersionUID = -2055260049565317972L;
        Font menuFont = new FontUIResource("Courier", Font.ITALIC + Font.BOLD, 12);
        Font menuItemFont = new FontUIResource("sans-serif", 0, 12);
        JMenu menu, subMenu;

        MenuBar() {
            UIManager.put("Menu.font", menuFont);
            UIManager.put("MenuItem.font", menuItemFont);

            menu = new JMenu("Menu");

            subMenu = new JMenu("Sub Menu");
            subMenu.add(new JMenuItem("Sub Item"));
            subMenu.add(new JMenu("Sub Menu"));
            menu.add(subMenu);

            menu.add(new JMenuItem("Sub Item"));
            menu.add(new JMenu("Sub Menu"));

            add(menu);

            menu = new JMenu("Another Menu");
            menu.add(new JMenu("Sub Menu"));
            menu.add(new JMenuItem("Sub Item"));
            menu.add(new JMenu("Sub Menu"));
            add(menu);
        }

        public void setMyFont(Font f, Font f2) {

            menuFont = f;
            menuItemFont = f2;
            UIManager.put("Menu.font", menuFont);
            UIManager.put("MenuItem.font", menuItemFont);
            SwingUtilities.updateComponentTreeUI(Main.this);
        }
    }

    private class CustomActionListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {
            mB.setMyFont(new FontUIResource("sans-serif", 0, 12), new FontUIResource("Courier", Font.ITALIC + Font.BOLD, 12));
        }
    }
}