Question

我一直试图通过按钮上的动作侦听器找出CardLayout （如此 - 从加载页面开始 - 并在按钮上单击切换到不同的“卡”

我的代码甚至不会立即运行我不完全确定为什么 - 我可以找到的大多数实现使用ItemListeners和组合框

我已经完成的基本过程是创建一个主JPanel，但我的卡JPanel到主JPanel，但我的不同卡到JPanel卡，然后将主JPanel添加到框架显示...

另外，对于我的一张卡片，我只需要显示一张图片 - 我之前只是通过创建一个新的弹出窗口来实现这一点但是能够切换框架显示它会很好...我不知道为什么我不明白这个

这是我的代码：

import java.awt.*;

/** 
 * Game
 * Main class that specifies the frame and widgets of the GUI
 */
public class Game implements Runnable {
public void run(){

    final String ON_OPEN = "Welcome!"; //Opening frame
    final String GAME = "Play!"; // Game Frame
    final String STATS = "Stats"; // Post-Game Stat Frame
    final String HELP = "Help"; //tutorial frame
    JPanel cards = new JPanel(); 
    JPanel master; // a panel for the card layout

    final JFrame frame = new JFrame(ON_OPEN);
    frame.setLocation(500,200);

    //Create the master layout for the program
    master = (JPanel) frame.getContentPane();
    master.setLayout(new BorderLayout()); // creating master layout

    //Create panel for all the cards in CardLayout
    final CardLayout cLay = new CardLayout();
    cards.setLayout(cLay);


    // all the cards
    final JPanel help = new JPanel();
    final JPanel stats = new JPanel();
    final JPanel game = new JPanel (new BorderLayout());
    final JPanel open = new JPanel (new FlowLayout());


    // setting up ON_OPEN layout - uses JPanel open

    final ImageIcon img = new ImageIcon("Instructions.png", "My Instructions..."); // the image I want shown under HELP card
    final JButton info = new JButton("Help");
    info.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
    //      cLay.show(help, HELP);     // WHAT I NORMALLY SHOULD BE DOING, RATHER JUST MAKE A NEW FRAME FOR THIS THOUGH
    //      frame.pack();

            final JFrame infoFrame = new JFrame("Tutorial");
            infoFrame.setLocation(500,50);
            JLabel tutorialImg = new JLabel(img);
    //      int w = img.getIconWidth();
        //  int h = img.getIconHeight();
            //infoFrame.setSize(w, h);
            infoFrame.pack();
            infoFrame.add(tutorialImg);
            infoFrame.setVisible(true);
        }
    });
    open.add(info); // the open-tutorial button



    //Add them to the cards JPanel
    cards.add(open, ON_OPEN);
    cards.add(help, HELP);
    cards.add(stats, STATS);
    cards.add(game, GAME);

    //Add the cards panel to the Master layout panel
    master.add(cards);


    // This code is all commented out because I'm not sure what I'm doing here...
//  frame.add(cards);
//  cLay.show(cards, ON_OPEN);

//  frame.add(open, BorderLayout.CENTER);

    // Main playing area - I want this to be shown in the GAME card...

    GridLayout tileGrid = new GridLayout(4,4);
    final JPanel grid = new JPanel(tileGrid);
      //    game.add(grid, BorderLayout.CENTER);

    //      grid.setLayout(tileGrid);
    //  frame.add(grid, BorderLayout.CENTER);


    // Input - holds typing box
    //        final JPanel status_panel = new JPanel();

    //  frame.add(cards, BorderLayout.CENTER);


//  frame.add(open, BorderLayout.CENTER);

    final JTextField typingArea = new JTextField();
    typingArea.setFocusTraversalKeysEnabled(false);
    typingArea.setEditable(true);
    typingArea.setFocusable(true);
    typingArea.requestFocus();


    frame.add(typingArea, BorderLayout.SOUTH);
    typingArea.addKeyListener(new KeyAdapter() {
        public void keyPressed (KeyEvent e) {
            if (e.getKeyCode() == KeyEvent.VK_ENTER) { // enter key is pressed
                String userWord = typingArea.getText().toLowerCase();
                typingArea.setText("");

            }
        }
    });


    final JLabel status = new JLabel("Running...");
    //        status_panel.add(status);

    // Reset button
    final JPanel control_panel = new JPanel();
    frame.add(control_panel, BorderLayout.NORTH);



    ]

    // Put the frame on the screen
    frame.pack();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);
}


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

}

Answer 1

问题：

您的代码不能为我们编译，因为我们没有JLetterField类。
您正在尝试将JFrame的contentPane添加回自身，并导致异常并且没有意义。

修改1：

您的最新代码显示您将所有内容放入一个非常大的run()方法中，但这样做会让您失去很多并且一无所获。
我建议摆脱Runnable接口，不需要它，并创建一个真正的OOP兼容类，一个私有字段以及公共和私有方法。
您的actionPerformed方法显示没有尝试更改CardLayout显示的卡片。
我建议您删除代码以显示新窗口并尝试在其中放置卡交换代码。
制作您的CardLayout和显示该类的卡片显示JPanel字段，以便其他方法可以访问它们并调用它们的方法。

编辑2：

例如，以下代码显示使用3个JButton交换卡片。一个获得前一张卡，一个获得下一张卡，一个显示如何获得特定卡（这里是第二张）：

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;

import javax.swing.*;

@SuppressWarnings("serial")
public class CardLayoutEg extends JPanel {
   private static final String[] CARD_LABELS = { "one", "two", "three", "four",
         "five", "six", "seven", "eight", "nine", "ten" };
   private static final int PREF_W = 400;
   private static final int PREF_H = PREF_W;
   private CardLayout cardlayout = new CardLayout();
   private JPanel cardHolder = new JPanel(cardlayout);
   private Action[] actions = { new ShowPreviousAction(), new ShowNextAction(),
         new ShowTwoCardAction() };

   public CardLayoutEg() {
      for (String cardLabelText : CARD_LABELS) {
         JLabel cardLabel = new JLabel(cardLabelText, SwingConstants.CENTER);
         cardHolder.add(cardLabel, cardLabelText);
      }

      JPanel btnPanel = new JPanel(new GridLayout(1, 0, 5, 0));
      for (Action action : actions) {
         btnPanel.add(new JButton(action));
      }

      setLayout(new BorderLayout());
      add(cardHolder, BorderLayout.CENTER);
      add(btnPanel, BorderLayout.SOUTH);
   }

   @Override
   public Dimension getPreferredSize() {
      return new Dimension(PREF_W, PREF_H);
   }

   private class ShowPreviousAction extends AbstractAction {
      public ShowPreviousAction() {
         super("Previous");
      }

      @Override
      public void actionPerformed(ActionEvent e) {
         cardlayout.previous(cardHolder);
      }
   }

   private class ShowNextAction extends AbstractAction {
      public ShowNextAction() {
         super("Next");
      }

      @Override
      public void actionPerformed(ActionEvent e) {
         cardlayout.next(cardHolder);
      }
   }

   private class ShowTwoCardAction extends AbstractAction {
      public ShowTwoCardAction() {
         super("Show Two");
      }

      @Override
      public void actionPerformed(ActionEvent e) {
         cardlayout.show(cardHolder, CARD_LABELS[1]);
      }
   }

   private static void createAndShowGui() {
      CardLayoutEg mainPanel = new CardLayoutEg();

      JFrame frame = new JFrame("CardLayout Example");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

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

CardLayout（swing）与按钮上的动作听众？

1 个答案: