Question

我正在尝试制作一款黑白棋游戏，而我正处于初级阶段，试图弄清楚如何让一个方块响应点击事件。到目前为止，这是我的代码。

要清楚，此刻，我只是想改变网格中单击面板的背景颜色。我还在学习ActionListeners的工作原理。

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.util.*;
import javax.swing.*;
import java.awt.event.MouseListener;

public class Reversi {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        ReversiFrame frame = new ReversiFrame();
        frame.setSize(400,450);
        frame.setResizable(false);
        frame.setVisible(true);


    }  
}
/**
 * 
 * Class for the frame
 */
class ReversiFrame extends JFrame{

    /**
     * Constructor for ReversiFrame
     */
    public ReversiFrame(){

        super("Reversi");
        setDefaultCloseOperation(EXIT_ON_CLOSE);

        JMenuBar bar = new JMenuBar();
        setJMenuBar(bar);

        JMenu gameMenu = new JMenu("Game");
        JMenu helpMenu = new JMenu("Help");

        bar.add(gameMenu);
        bar.add(helpMenu);

        final JMenuItem newGame = new JMenuItem("New Game");
        final JMenuItem exit = new JMenuItem("Exit");
        final JMenuItem help = new JMenuItem("Help");

        gameMenu.add(newGame);
        gameMenu.add(exit);
        helpMenu.add(help);

        /**
         * Exits program when exit menu item is clicked.
         */
        exit.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                dispose();
            }
        });

        ReversiPanel panel = new ReversiPanel();
        add(panel);


    }
}

class ReversiPanel extends JPanel{
    public static final int GRID_ROWS = 8;
    public static final int GRID_COLS = 8;
    public static final int HEIGHT = 50;
    public static final int WIDTH = 50;

    private GridPanel [][] panels = new GridPanel[GRID_ROWS][GRID_COLS];

    public ReversiPanel(){
        setLayout(new GridLayout(GRID_ROWS,GRID_COLS));
        setSize(HEIGHT, WIDTH);
        for(int row = 0; row < GRID_ROWS; row++){
            for(int col = 0; col < GRID_COLS; col++){
                panels[row][col] = (new GridPanel(row, col));
                setFocusable(true);
                panels[row][col].addMouseListener(new MouseAdapter(){
                    /*public void mouseClicked(MouseEvent e){
                        ((GridPanel)e.getSource()).getParent().setBackground(Color.red);
                        repaint();
                    }*/
                });
            }
        }
    }

    public void paintComponent(Graphics g){
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;
        for(int row = 0; row < GRID_ROWS; row++){
            for(int col = 0; col < GRID_COLS; col++){
                panels[row][col].draw(g2);
            }
        }
    }
}

class GridPanel extends JPanel{
    public static final int HEIGHT = 50;
    public static final int WIDTH = 50;
    private boolean filled;
    private int numberGridsFilled = 0;
    private int x, y;


    public GridPanel(int row, int col){
        x = row * WIDTH;
        y = + col * HEIGHT;
        setSize(HEIGHT, WIDTH);
        filled = false;
        setBorder(BorderFactory.createLineBorder(Color.GRAY));
        setBackground(Color.red);

        addMouseListener(new MouseAdapter(){


            public void mouseClicked(MouseEvent e){
                setBackground(Color.RED);
                repaint();
            }
        });

    }



    public void draw(Graphics2D g2){
        g2.setPaint(Color.GRAY);
        Rectangle2D r = new Rectangle2D.Double(x, y, WIDTH, HEIGHT);
        g2.draw(r);
    }

    public void changeColor(){
        setBackground(Color.BLACK);
    }

    public void setColor() {
        setBackground(Color.BLACK);
    }
}

class Tile{
    private Color color;

    public Tile(Color color){

    }
}

Answer 1

首先，我不会panels[row][col].draw(g2); paintComponent GridPanel JPanel延伸JPanel而paintComponent非常有能力绘画本身。

首先删除GridPanel方法，然后将ReversiPanel添加到public ReversiPanel() { setLayout(new GridLayout(GRID_ROWS, GRID_COLS)); for (int row = 0; row < GRID_ROWS; row++) { for (int col = 0; col < GRID_COLS; col++) { panels[row][col] = (new GridPanel(row, col)); add(panels[row][col]); setFocusable(true); panels[row][col].addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e){ ((GridPanel)e.getSource()).getParent().setBackground(Color.red); repaint(); } }); } } } ...

GridPanel

将组件添加到容器（附加到本地对等方）时，它就有资格进行事件通知

现在，在您draw中，将paintComponent方法替换为getPreferredSize并覆盖class GridPanel extends JPanel { public static final int HEIGHT = 50; public static final int WIDTH = 50; private boolean filled; private int numberGridsFilled = 0; private int row, col; public GridPanel(int row, int col) { row = row; col = col; filled = false; setBorder(BorderFactory.createLineBorder(Color.GRAY)); setBackground(Color.red); } public Dimension getPreferredSize() { return new Dimenions(WIDTH, HEIGHT); } @Override protected void paintComponent(Graphics g) { Graphics2D g2d = (Graphics2D)g.create(); g2d.setPaint(Color.GRAY); Rectangle2D r = new Rectangle2D.Double(x, y, WIDTH, HEIGHT); g2d.draw(r); g2d.dispose(); }以返回所需的组件大小

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Answer 2

...试图找出如何使用方格响应点击事件。

将方块设为（可能未修饰）JButton而不是JPanel。为按钮添加图标和/或文本，然后添加ActionListener。

带有动作侦听器的按钮将响应鼠标和键盘事件。

E.G。如this answer至Add a complex image in the panel, with buttons around it in one customized user interface中所示。

如何将MouseListeners添加到面板网格中的单个面板？

2 个答案: