JButton不会在单击按钮时更新 [英] JButtons won't update on button click

问题描述

当前显示带有8x8随机彩色按钮网格的GUI. newButton用于将得分显示重置为0，并像单击后启动时一样重新设置网格.除了与Java显示按钮的方式以及分层的工作方式有关之外，我无法找到许多其他解决方案.这是我正在使用的2个课程.

Currently displays a GUI with an 8x8 grid of randomized colored buttons. The newButton is to reset the score display to 0 and reset the grid with a fresh like it does on startup after being clicked. I haven't been able to find many solutions other than that it's to do with the way Java displays it's buttons and the way layering works. Here are the 2 classes I'm using.

import javax.swing.JFrame; 
import javax.swing.*;
import java.awt.event.*;
import javax.swing.JPanel;
import java.awt.Color;

public class ShinyButtonsApp extends JFrame implements ActionListener {

    private static byte ROWS = 8;
    public int useThis; 
    ShinyButtons shiny = new ShinyButtons();
    public static ImageIcon[] icons = {new ImageIcon("RedButton.png"),
                                       new ImageIcon("OrangeButton.png"), 
                                       new ImageIcon("YellowButton.png"), 
                                       new ImageIcon("GreenButton.png"), 
                                       new ImageIcon("BlueButton.png"), 
                                       new ImageIcon("LightGrayButton.png"), 
                                       new ImageIcon("DarkGrayButton.png")}; 


    public ShinyButtonsApp(String title) { 
        super(title); // Set title of window 
        setDefaultCloseOperation(EXIT_ON_CLOSE); // allow window to close 
        setSize(578, 634); // Set size of window 
        setResizable(false);

        getContentPane().setLayout(null);   

        JLabel aLabel = new JLabel("Score: "); 
        aLabel.setLocation(10, 570); 
        aLabel.setSize(80,30); 
        getContentPane().add(aLabel);

        JTextField scoreField = new JTextField(); 
        scoreField.setText(Integer.toString(shiny.score));
        scoreField.setEditable(false);
        scoreField.setHorizontalAlignment(JTextField.RIGHT);
        scoreField.setLocation(60, 570); 
        scoreField.setSize(120,30);
        scoreField.setBackground(Color.WHITE); 
        getContentPane().add(scoreField);

        JButton newButton = new JButton("New Game");
        newButton.addActionListener(this);
        newButton.setLocation(348,570);
        newButton.setSize(110,30);
        getContentPane().add(newButton);

        JButton quitButton = new JButton("Quit");
        quitButton.setLocation(468,570);
        quitButton.setSize(80,30);
        getContentPane().add(quitButton);

        resetButtons2();
    } 

    public void actionPerformed(ActionEvent e) {
                shiny.score = 0;
                shiny.resetButtons();
                resetButtons2();
    }

    public void resetButtons2() {
        for (int r=0; r<ROWS; r++) {
            for (int c=0; c<ROWS; c++) {
                ImageIcon image1 = icons[(int)shiny.getButton(r,c)];
                JButton button = new JButton(image1);
                button.setLocation(10+(69*r),10+(69*c));
                button.setSize(69,69);
                button.setBorder(BorderFactory.createLineBorder(Color.GRAY,1));
                getContentPane().add(button);
            }
        }
    }

    public static void main(String[] args) { 
        ShinyButtonsApp frame;      
        frame = new ShinyButtonsApp("Shiny Buttons"); // Create window 
        frame.setVisible(true); // Show window      
    }   
}

和

import javax.swing.JFrame; 
import javax.swing.*;
import java.awt.event.*;
import javax.swing.JPanel;
import java.awt.Color;

public class ShinyButtons extends JPanel{ 
    public static byte RED = 0; 
    public static byte ORANGE = 1; 
    public static byte YELLOW = 2; 
    public static byte GREEN = 3; 
    public static byte BLUE = 4; 
    public static byte LIGHT_GRAY = 5; 
    public static byte DARK_GRAY = 6; 

    public static byte ROWS = 8; 

    public byte[][] buttonTable;

    public int score = 0; 

    public ShinyButtons() { 
        buttonTable = new byte[ROWS][ROWS]; 
        resetButtons(); 
    } 

    public void resetButtons() { 
        for (int r=0; r<ROWS; r++) 
            for (int c=0; c<ROWS; c++) 
                buttonTable[r][c] = (byte)(Math.random()*7); 
    } 

    public byte getButton(int r, int c) { return buttonTable[r][c]; } 

    public int getScore() { return score; }
} 

推荐答案

以为基础的内容 指出(如您 那样，使用布局管理器代替设置大小)，只需循环遍历JPanel的组件(JLabels)，即可重置图像并更改其图标.

Building on to what this answer points out (using layout managers instead of setting size, as you should be doing) you could reset the the images just by looping through the components (JLabels) of the JPanel and changing their icons.

此特定示例在MouseListeners中使用JLabels，但在ActionListeners中可以轻松切换到JButtons

This particular example uses JLabels with MouseListeners but it could easily be switched to JButtons with ActionListeners

newGame.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent e) {
         reset(iconPanel, icons);               <--- call reset method from below
         score = 0;
         scoreField.setText(String.valueOf(score));
    }
});
....

private void reset(JPanel panel, ImageIcon[] icons) {
    Component[] comps = panel.getComponents();
    Random random = new Random();
    for(Component c : comps) {
        if (c instanceof JLabel) {
            JLabel button = (JLabel)c;
            int index = random.nextInt(icons.length);
            button.setIcon(icons[index]);
        }
    }
}

这是完整的运行代码.您只需要替换图像路径即可.

Here's the complete running code. You just need to replace the image paths.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Random;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import javax.swing.border.LineBorder;

public class CircleImages {

    private int score = 0;
    private JTextField scoreField = new JTextField(10);

    public CircleImages() {
        scoreField.setEditable(false);

        final ImageIcon[] icons = createImageIcons();
        final JPanel iconPanel = createPanel(icons, 8);

        JPanel bottomLeftPanel = new JPanel(new FlowLayout(FlowLayout.LEADING));
        bottomLeftPanel.add(new JLabel("Score: "));
        bottomLeftPanel.add(scoreField);

        JPanel bottomRightPanel = new JPanel(new FlowLayout(FlowLayout.TRAILING));
        JButton newGame = new JButton("New Game");
        bottomRightPanel.add(newGame);
        JButton quit = new JButton("Quit");
        bottomRightPanel.add(quit);

        JPanel bottomPanel = new JPanel(new GridLayout(1, 2));
        bottomPanel.add(bottomLeftPanel);
        bottomPanel.add(bottomRightPanel);

        newGame.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                reset(iconPanel, icons);
                score = 0;
                scoreField.setText(String.valueOf(score));
            }
        });

        JFrame frame = new JFrame();
        frame.add(iconPanel);
        frame.add(bottomPanel, BorderLayout.PAGE_END);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    private void reset(JPanel panel, ImageIcon[] icons) {
        Component[] comps = panel.getComponents();
        Random random = new Random();
        for(Component c : comps) {
            if (c instanceof JLabel) {
                JLabel button = (JLabel)c;
                int index = random.nextInt(icons.length);
                button.setIcon(icons[index]);
            }
        }
    }

    private JPanel createPanel(ImageIcon[] icons, int gridSize) {
        Random random = new Random();
        JPanel panel = new JPanel(new GridLayout(gridSize, gridSize));
        for (int i = 0; i < gridSize * gridSize; i++) {
            int index = random.nextInt(icons.length);
            JLabel label = new JLabel(icons[index]);
            label.addMouseListener(new MouseAdapter(){
                public void mouseClicked(MouseEvent e) {
                    score += 1;
                    scoreField.setText(String.valueOf(score));
                }
            });
            label.setBorder(new LineBorder(Color.GRAY, 2));
            panel.add(label);
        }
        return panel;
    }

    private ImageIcon[] createImageIcons() {
        String[] files = {"blackcircle.png",
            "bluecircle.png",
            "greencircle.png",
            "greycircle.png",
            "orangecircle.png",
            "redcircle.png",
            "yellowcircle.png"
        };
        ImageIcon[] icons = new ImageIcon[files.length];
        for (int i = 0; i < files.length; i++) {
            icons[i] = new ImageIcon(getClass().getResource("/circles/" + files[i]));
        }
        return icons;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new CircleImages();
            }
        });
    }
}

这篇关于JButton不会在单击按钮时更新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！