如何使菜单项(JMenuItem的)快捷键?(How do you make menu item (

2019-08-02 16:37发布

所以,我注意到,在AWT有一个MenuItem的构造函数用于添加CTRL +(某些键)的快捷方式,但对于没有这种构造JMenuItem 。 什么是这样做的正确方法?

我需要AWT的equivelent:

MenuItem mi = new MenuItem("Copy", new MenuShortcut(KeyEvent.VK_C));

但对于摇摆。

Answer 1:

例如,对于CTRL + N。

menuItem.setAccelerator(KeyStroke.getKeyStroke('N', Toolkit.getDefaultToolkit ().getMenuShortcutKeyMask()));

Toolkit.getDefaultToolkit ().getMenuShortcutKeyMask()返回控制在Mac OS在Windows和Linux,以及命令键(⌘)键(CTRL)。



Answer 2:

只需创建一个KeyStroke并调用setAccelerator(...)JMenuItem像这样:

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;
import java.awt.Toolkit; 

public class Test {

    public Test() {
        initComponents();
    }

    public static void main(String[] args) {
        //create Swing components on EDT
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Test();
            }
        });
    }

    private void initComponents() {
        //create JFrame
        JFrame frame = new JFrame("Accelerator Sample");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JMenuBar menuBar = new JMenuBar();//create menu bar to hold menus
        JMenu menu = new JMenu("File");//create a menu
        menuBar.add(menu);//add menu to bar

        JMenuItem menuItem = new JMenuItem("Say Hello");//create menu item

        //set shortcut CTRL+H (command+h on mac os)
        KeyStroke ctrlH = KeyStroke.getKeyStroke(KeyEvent.VK_H, Toolkit.getDefaultToolkit ().getMenuShortcutKeyMask());

        //set the accelerator
        menuItem.setAccelerator(ctrlH);
        //add listener which will be called when shortcut is pressed
        menuItem.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent actionEvent) {
                System.out.println("Hello, World");
            }
        });

        menu.add(menuItem);//add item to menu 'File'

        frame.setJMenuBar(menuBar);//set menubar of JFrame
        frame.pack();
        frame.setVisible(true);//set frame visible
    }
}


文章来源: How do you make menu item (JMenuItem) shortcut?