Question

我有一个JMenuBar的以下代码（此代码取自免费的java程序调用{{3}}并为个人目的而编辑）

import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.awt.Dimension;
import java.awt.Color;

public class GuiDMenuBar extends JMenuBar
{
    JMenu m_file,m_edit,m_help;
    JMenuItem mi_f_new,mi_f_open,mi_f_save,mi_f_saveas,mi_f_exit;
    JMenuItem mi_e_cut,mi_e_copy,mi_e_paste,mi_e_delete;
    JMenuItem mi_v_motif,mi_v_java,mi_v_windows,mi_v_nimbus;
    JMenuItem mi_h_help,mi_h_about;
    JButton m_code;

    public GuiDMenuBar()
    {
        setBorderPainted(true);
        makeFileMenu();
        makeEditMenu();
        makeCodeButton();
        makeHelpMenu();
    }

    void makeFileMenu()
    {
        m_file = new JMenu("File");
        m_file.setMnemonic('F');

        mi_f_new = new JMenuItem("New",new ImageIcon("icons/new_project.png"));
        mi_f_new.setMnemonic('N');
        mi_f_open = new JMenuItem("Open",new ImageIcon("icons/open_project.png"));
        mi_f_open.setMnemonic('O');
        mi_f_save = new JMenuItem("Save",new ImageIcon("icons/save.png"));
        mi_f_save.setMnemonic('S');
        mi_f_saveas = new JMenuItem("Save Java File",new ImageIcon("icons/saveas.png"));
        mi_f_saveas.setMnemonic('J');
        mi_f_exit = new JMenuItem("Exit",new ImageIcon("icons/exit.png"));
        mi_f_exit.setMnemonic('X');

        mi_f_new.setAccelerator(KeyStroke.getKeyStroke("control N"));
        mi_f_open.setAccelerator(KeyStroke.getKeyStroke("control O"));
        mi_f_save.setAccelerator(KeyStroke.getKeyStroke("control S"));
        mi_f_saveas.setAccelerator(KeyStroke.getKeyStroke("control J"));
        mi_f_exit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_F4,InputEvent.ALT_MASK));

        m_file.add(mi_f_new);
        m_file.add(mi_f_open);
        m_file.addSeparator();
        m_file.add(mi_f_save);
        m_file.add(mi_f_saveas);
        m_file.addSeparator();
        m_file.add(mi_f_exit);

        add(m_file);
    }

    void makeEditMenu()
    {
        m_edit = new JMenu("Edit");
        m_edit.setMnemonic('E');

        mi_e_cut = new JMenuItem("Cut",new ImageIcon("icons/cut.png"));
        mi_e_cut.setMnemonic('X');
        mi_e_copy = new JMenuItem("Copy",new ImageIcon("icons/copy.png"));
        mi_e_copy.setMnemonic('C');
        mi_e_paste = new JMenuItem("Paste",new ImageIcon("icons/paste.png"));
        mi_e_paste.setMnemonic('P');
        mi_e_delete = new JMenuItem("Delete",new ImageIcon("icons/delete.png"));
        mi_e_delete.setMnemonic('D');


        mi_e_cut.setAccelerator(KeyStroke.getKeyStroke("control X"));
        mi_e_copy.setAccelerator(KeyStroke.getKeyStroke("control C"));
        mi_e_paste.setAccelerator(KeyStroke.getKeyStroke("control V"));
        mi_e_delete.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_DELETE,0));

        m_edit.add(mi_e_cut);
        m_edit.add(mi_e_copy);
        m_edit.add(mi_e_paste);
        m_edit.add(mi_e_delete);

        add(m_edit);
    }

    void makeHelpMenu()
    {
        m_help = new JMenu("Help");
        m_help.setMnemonic('H');

        mi_h_help = new JMenuItem("Help",new ImageIcon("icons/help.png"));
        mi_h_help.setMnemonic('H');
        mi_h_about = new JMenuItem("About");
        mi_h_about.setMnemonic('A');

        mi_h_help.setAccelerator(KeyStroke.getKeyStroke("F1"));
        mi_h_about.setAccelerator(KeyStroke.getKeyStroke("control A"));

        m_help.add(mi_h_help);
        m_help.addSeparator();
        m_help.add(mi_h_about);

        add(m_help);
    }

    void makeCodeButton()
    {
        m_code = new JButton();

        m_code.setOpaque(false);
        m_code.setContentAreaFilled(false);
        m_code.setBorder(null);
        m_code.setFocusable(false);

        m_code.setText("Code   Shift C");

        Dimension dBt = new Dimension(75,25);
        m_code.setMinimumSize(dBt);
        m_code.setPreferredSize(dBt);
        m_code.setMaximumSize(dBt);

        m_code.getModel().addChangeListener(new ChangeListener()
        {
            @Override
            public void stateChanged(ChangeEvent e) 
            {
                ButtonModel model = (ButtonModel) e.getSource();

                if(model.isRollover())
                {
                    m_code.setBackground(Color.RED);
                    m_code.setOpaque(true);
                } 

                else 
                {
                    m_code.setBackground(null);
                    m_code.setOpaque(false);
                    m_code.setContentAreaFilled(false);
                }
             }
        });

        m_code.setMnemonic('C');

        add(m_code);
    }

    public void addListeners(ActionListener al)
    {
        mi_f_new.addActionListener(al);
        mi_f_open.addActionListener(al);
        mi_f_save.addActionListener(al);
        mi_f_saveas.addActionListener(al);
        mi_f_exit.addActionListener(al);

        mi_e_cut.addActionListener(al);
        mi_e_copy.addActionListener(al);
        mi_e_paste.addActionListener(al);
        mi_e_delete.addActionListener(al);

        mi_h_help.addActionListener(al);
        mi_h_about.addActionListener(al);

        m_code.addActionListener(al);
    }

}

我的目标是使JButton看起来像是一个JMenu。这将导致按钮仅在我与JMenuBar的其余部分进行交互时才会改变颜色，而不仅仅是当我将鼠标悬停在它上面时。例如，如果我点击JMenu m_file然后在JButton上空盘旋，背景会改变，但是如果我之前没有与JMenuBar交互，当我将鼠标悬停在JButton上时它不应该改变背景。接下来需要的是JMenuBar将其视为JMenu。我的意思是在单击F10并选择第一个JMenu的意义上。之后，您可以单击键盘上箭头键盘上的右箭头，这将选择下一个JMenu。但是，使用这种导航方法会跳过JButton，并且不允许您以任何方式与JButton进行交互。我的意思是，如果你与JMenu交互，然后将鼠标悬停在JButton上，JMenuBar就会显示你仍然在JMenu上空盘旋（见图片）。

Two interaction at once

所以我想我有三个问题。

如果JMenuBar已与之交互，如何让JButton只改变颜色？
你如何让JMenuBar以我所描述的方式将JButton视为JMenu？
当您悬停在JMenu上时，是否有人知道JMenu背景的确切颜色？因为我更喜欢将我的JButton的背景改为JMenu背景的相同颜色，而不是仅仅是红色。

谢谢，

丹

让JButton像JMenu一样行事

0 个答案: