益智游戏中的 JPanel 未更新 [英] JPanel in puzzle game not updating

问题描述

我有一个简单的益智游戏.有一个由 16 个图块(随机放置)组成的图像.图片存储在一个数组中，当游戏启动时，它们会被添加到主 JPanel 中.

I have a simple puzzle game. There is an image consisting of 16 tiles (randomly placed). Images are stored in an array and when game is launched they're added to main JPanel.

游戏以这种方式工作:每个图像都有属性位置"和编号".'Place' 是网格上的当前位置(正确与否)，'number' 是图像所需的位置.当用户单击图像时，会检查其位置"和编号"属性.如果它们匹配，则不会发生任何事情.如果不是，游戏检查当前内存中是否有任何图像.如果没有，则存储此图像的位置"和编号".如果内存中有一些图像，则使用存储图像的编号"检查当前单击的图像的位置".当他们匹配时 - 他们的位置被交换.这部分工作正常.但是现在，我正在使用更新的图像在我的 JPanel 上调用 addComponent 方法，但没有任何反应.不应该将新图像添加到 JPanel 以替换旧图像吗?

Game works in this way : Each image has atributes 'place' and 'number'. 'Place' is the current place on grid (either correct or not) and 'number' is the desired place for the image. When a user clicks image their 'place' and 'number' attributes are checked. If they match nothing happens. If not game checks if any image is currently in memory. If there is none, then this image's 'place' and 'number' are stored. If there is some image in memory, then the currently clicked image's 'plac'e is checked with stored image's 'number'. When they match - their places are exchanged. This part works properly. But now, I'm calling addComponent method on my JPanel with updated images and simply nothing happens. Shouldn't the new images be added to JPanel replacing the old ones ?

礼包奖励；

import javax.swing.*;
import java.util.Random;
import java.awt.event.*;
import java.awt.*;

class Puzzle extends JPanel implements ActionListener {
    private int selected_nr=-1;
    private int selected_pl=-1;
    private boolean memory=false;
    private static Img[] images;

    public Puzzle(){
        JFrame f = new JFrame("Smile");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(this);
        f.setSize(252,252);
        f.setVisible(true);

        setLayout(new GridLayout(4, 4));
        images = new Img[16];
        int[] buttons = new int[16];

        for(int i=0; i<16; i++){
            buttons[i] = i;
        }

        int rand;
        int temp;
        Random random;

        random = new Random(System.currentTimeMillis());
        for (int i = 0; i < buttons.length; i++) {
            rand = (random.nextInt() & 0x7FFFFFFF) % buttons.length;
            temp = buttons[i];
            buttons[i] = buttons[rand];
            buttons[rand] = temp;
        }

        for (int i = 0; i < 16; i++) {
            images[i] = new Img(i, buttons[i]);
        }
        addComponents(images);
    }

    public void addComponents(Img[] im){
        this.removeAll();
        for(int i=0; i<16; i++){
            im[i].addActionListener(this);
            im[i].setPreferredSize(new Dimension(53,53));
            add(im[i]);
        }
        this.validate();
    }

    public void actionPerformed(ActionEvent e) {
        Img b = (Img)(e.getSource());
        int num = b.getNumber();
        int pl = b.getPlace();

        if(!(b.rightPlace())){
            if(memory){
                if(pl == selected_nr){
                    images[pl].setPlace(selected_pl);
                    images[selected_pl].setPlace(selected_nr);
                    selected_nr = -1;
                    selected_pl = -1;
                    memory = false;
                    addComponents(images);
                }
                else{
                    System.out.println("Try other image");
                }
            }
            else{
                memory = true;
                selected_nr = num;
                selected_pl = pl;
            }
        }
        else{
            System.out.println("OK !");
        }
    }

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

class Img extends JButton {
    int number;
    int place;
    ImageIcon img;

    public Img(int p, int n){
        number = n;
        place = p;
        img = new ImageIcon("u"+number+".jpg", BorderLayout.CENTER);
        setIcon(img);
    }

    public boolean rightPlace(){
        boolean correct=false;
        if(number == place){
            correct = true;
        }
        return correct;
    }
    public void setPlace(int i){
        place = i;
    }
    public int getNumber(){
        return number;
    }
    public int getPlace(){
        return place;
    }
}

更改了代码以使用答案，但仍然没有运气. addComponents() 获取更新的图像[] 但不重新验证它们.

Changed the code to use the answers, but still no luck. addComponents() gets updated images[] but doesn't revalidate them.

推荐答案

更改组件后，您需要通过调用 invalidate() 或 revalidate() 来刷新" Swing 组件.

After changing the components, you need to 'refresh' the Swing component by calling invalidate() or revalidate().

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