Question

我有2个面板（2个类，从JPanel扩展），1个框架（1个类，从JFrame扩展）

我的第一个面板 - WelcomePanel：

package caro;

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

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class WelcomePanel extends JPanel {

    public WelcomePanel() {

        ImageIcon logoImage = new ImageIcon("/home/khanhpq/logo.png");
        JButton playButton = new JButton("Play");
        JButton exitButton = new JButton("Exit");

        JLabel imageLabel = new JLabel(logoImage);

        add(imageLabel);
        add(playButton);
        add(exitButton);

        playButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {



            }
        });

        exitButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                int option = JOptionPane.showConfirmDialog(null, "Are you sure ?", "Warning", JOptionPane.YES_NO_OPTION);               
                if(option == JOptionPane.YES_OPTION) {
                    System.exit(0);
                }
            }
        });

    }

}

我的第二个小组 - BoardPanel：

package caro;

import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JPanel;

public class BoardPanel extends JPanel {    

    public BoardPanel() {

        JPanel boardPanel = new JPanel();

        Board board = new Board();

        CellButton cellButton[] = new CellButton[144];

        GridLayout gridLayout = new GridLayout(12, 12);     
        boardPanel.setLayout(gridLayout);       

        for (int i = 0; i < 144; i++) {         
                cellButton[i] = new CellButton();               
                boardPanel.add(cellButton[i]);              
        }

    }

}

我的主框架 - MainFrame

package caro;

import javax.swing.JFrame;

public class MainFrame extends JFrame {

    public MainFrame() {
        add(new WelcomePanel());
        setSize(360, 380);
        setVisible(true);

    }

    public static void main(String[] args) {
        MainFrame startFrame = new MainFrame();
    }

}

我的问题：帮我在面板按钮上编写代码，addActionListener（材质示例）。当我按下播放按钮（WelcomePanel）时，隐藏了WelcomePanel并显示了BoardPanel。并且，当我退出BoardPanel（按下关闭按钮，或单击x按钮）时，将显示WelcomePanel。我的朋友推荐使用Message和Handle，但我不知道。请帮我。感谢。

Answer 1

最好将依赖项（像按钮，面板等组件......）声明为字段。通过这种方式，它们对于作为它们的控制器的第三类是可见的。在下一个例子中，我让MainFrame控制自己，只是一个例子。阅读演示模式以获得更好的实践。

WelcomePanel.java

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class WelcomePanel extends JPanel {

    /* Declare your dependecies as fields,
     * so you can hold a reference.
     */
    ImageIcon logoImage;
    JButton playButton;
    JButton exitButton;
    JLabel imageLabel;

    public WelcomePanel() {

        logoImage = new ImageIcon("/home/khanhpq/logo.png");
        playButton = new JButton("Play");
        exitButton = new JButton("Exit");
        imageLabel = new JLabel(logoImage);

        add(imageLabel);
        add(playButton);
        add(exitButton);

    }

}

BoardPanel.java

import javax.swing.JButton;
import javax.swing.JPanel;

public class BoardPanel extends JPanel {

    /* Declare your dependecies as fields,
     * so you can hold a reference.
     */
    JButton closeButton;

    public BoardPanel() {
        closeButton = new JButton();
        add(closeButton);

    }
}

MainFrame.java

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;

public class MainFrame extends JFrame implements ActionListener {

    /* Declare your dependecies as fields,
     * so you can hold a reference.
     */
    WelcomePanel welcomePanel;
    BoardPanel boardPanel;

    public MainFrame() {
        welcomePanel = new WelcomePanel();
        boardPanel = new BoardPanel();

        add(welcomePanel);
        add(boardPanel);

        boardPanel.setVisible(false);

        boardPanel.closeButton.addActionListener(this);
        welcomePanel.playButton.addActionListener(this);

        setSize(360, 380);
    }

    /**
     * This class is the controller.
     */
    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource().equals(boardPanel.closeButton)) {
            welcomePanel.setVisible(false);
            boardPanel.setVisible(true);
        } else if (e.getSource().equals(welcomePanel.playButton)) {
            welcomePanel.setVisible(true);
            boardPanel.setVisible(false);
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                MainFrame startFrame = new MainFrame();
                startFrame.setVisible(true);

            }
        });
    }
}

jpanel上的actionListener。如何映射到大型机？

1 个答案: