java - Swing Java 动画仅在未从监听器调用时才有效

Question

我正在尝试在 java(swing) 中创建一个带有动画的函数。我想创建一个“堆栈”卡片，然后能够使用一种方法从堆栈中抽出一张卡片。然后我画的卡片应该“翻转”以露出正面。

除非我尝试使用监听器绘制新卡片，否则它工作正常。

我通过构建堆栈然后绘制一张卡片来启动程序。然后我有一个绘制新卡片的按钮(actionlistener)。动画没有显示，但我可以看到堆栈减少了一张卡片。我试图创建一个 gif 来显示问题。

Gif file showing the problem http://people.dsv.su.se/~chra4852/gif.gif

我最好的猜测是它与线程或 EDT 有关？

这是代码(我删除了 Scalr 类的使用，因为它不重要):

import java.awt.*;
import java.awt.event.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.URL;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.*;
// import org.imgscalr.Scalr; Removed for Stackoverflow

public class Test extends JFrame{

public static JPanel cardPanel = new JPanel();
public static JLayeredPane layerPane = new JLayeredPane();
private final CardFlipp cardFlipp;


Test() {
    cardFlipp = new CardFlipp();
    this.setLayout(new BorderLayout());
    layerPane.setPreferredSize(new Dimension(700, 300));
    add(cardPanel, BorderLayout.CENTER);
    JButton newJButton = new JButton("New card");
    newJButton.addActionListener(new drawNewCardListener());
    add(newJButton, BorderLayout.SOUTH);
    setSize(800,400);
    setLocationRelativeTo(null);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setVisible(true);
    Point pos = new Point(10,30);
    cardFlipp.createCardFlipp(30, pos, layerPane, cardPanel);
    System.out.println("Now running on thread " + Thread.currentThread());
    try {
        Thread.sleep(3000);
    } catch (InterruptedException ex) {
        Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
    }
    cardFlipp.displayCard("http://imgi.se/image.php?di=IYW9");
}

public static void main(String[] args){
    new Test();
}

    class drawNewCardListener implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent ae) {
        System.out.println("Now running on thread " + Thread.currentThread());
        cardFlipp.displayCard("http://imgi.se/image.php?di=IYW9");
    }
    }
}


class CardFlipp extends JPanel{

private Point origin;
private BufferedImage icon;
private JLayeredPane lPane;
private JPanel jPanel;
private int lastCardDisplayedId = 0;

public void createCardFlipp(int amount, Point pos, JLayeredPane lPaneRef, JPanel jPanelRef) {
    origin = pos;
    setIcon("http://imgi.se/image.php?di=HPCJ");
    lPane = lPaneRef;
    jPanel = jPanelRef;
    for(int i = amount; i > 0; i--) {
        origin.x += 3;
        lPane.add(new Card(origin, icon, i), new Integer(amount-i));
        jPanel.add(lPane);
        lPane.revalidate();
        lPane.repaint();
        try {
            Thread.sleep(80);
        } catch (InterruptedException ex) {
            Logger.getLogger(CardFlipp.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}

public void displayCard(String fileUrl) {
    Card c = (Card) lPane.getComponent(0);
    if(lastCardDisplayedId == 0) {
        origin = new Point(c.getBounds().x + 370, c.getBounds().y);
    }
    int cardId = c.getId();
    setIcon(fileUrl);
    c.flippCardRight(lastCardDisplayedId);
    lPane.remove(c);
    if(lastCardDisplayedId != 0) {
        for(int i = 0; i < lPane.getComponentCount(); i++) {
            c = (Card) lPane.getComponent(i);
            if(c.getId() == lastCardDisplayedId) {
                lPane.remove(c);
                break;
            }
        }
    }
    lPane.repaint();
    lPane.add(new Card(origin, icon, cardId), new Integer(0));
    jPanel.add(lPane);
    lastCardDisplayedId = cardId;
}

private void setIcon(String urlPath) {
    try {
        URL url = new URL(urlPath);
        icon = ImageIO.read(url);
    } catch (IOException e) {
        System.err.println(e);
        System.exit(-1);
        icon = null;
    }
}
}

class Card extends JComponent {

private BufferedImage buffImg;
private ImageIcon iconImg;
private final int id;

public Card(Point origin, BufferedImage img, int count) {
    buffImg = img;
    iconImg = new ImageIcon(buffImg);
    setBounds(origin.x,origin.y,iconImg.getIconWidth(),iconImg.getIconHeight());
    this.id = count;
}

@Override
protected void paintComponent(Graphics g) {
    super.paintComponent(g);
    g.drawImage(iconImg.getImage(), 0, 0, this);
}

public void flippCardRight(int count) {
    int x = count * 3;
    int newPosX = getBounds().x + iconImg.getIconWidth() + 20;

    while(getBounds().x < newPosX + x) {
        setBounds(getBounds().x+5,getBounds().y,iconImg.getIconWidth(),iconImg.getIconHeight());
        wait10MiliSec();
    }

    // Removed to not need the scalr class
    //int minimize = 10;
    //while(iconImg.getIconWidth() > minimize) {
        //buffImg = Scalr.resize(buffImg, Scalr.Method.SPEED, Scalr.Mode.FIT_EXACT, //iconImg.getIconWidth()-minimize, iconImg.getIconHeight(), Scalr.OP_ANTIALIAS);
        //iconImg = new ImageIcon(buffImg);
        //setBounds(getBounds().x+minimize-1,getBounds().y,iconImg.getIconWidth(),iconImg.getIconHeight());
        //wait10MiliSec();
    //}
}

private void wait10MiliSec() {
    try {
        Thread.sleep(10);
    } catch (InterruptedException ex) {
        Logger.getLogger(Card.class.getName()).log(Level.SEVERE, null, ex);
    }
}

public int getId() {
    return this.id;
}

public int getImgWidth() {
    return iconImg.getIconWidth();
}
}

问题 = 可以做些什么来显示动画，而不管它是否从监听器调用？

Answer 1

使用计时器将是您的解决方案:) Example of a similar problem那个人有类似的问题，你可以阅读他收到的答案。祝你好运