我正在嘗試使用CardLayout構建遊戲的UI,儘管在我的卡片切換方法中使用了revalidate()和repaint(),但似乎無法使其更新。該程序旨在證明使用CardLayout在JFrame內部切換JPanel的概念,因爲如果我可以成功完成該操作,則可以使用其他JPanel重複該過程。不確定該錯誤是否與線程或更新UI有關。總之,這裏是我的代碼:如何讓我的CardLayout UI更新?
/*
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* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package nationsapp;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.CardLayout;
/**
*
* @author StephenAHyberger
*/
public abstract class NationsApp {
//Initiates the JFrame for the application
public static JPanel deck = new JPanel();
//Initiates the CardLayout and its elements for the application
public static CardLayout deckShuffle = new CardLayout();
public static String MENUCARD = "MENUCARD";
public static String GAMECARD = "GAMECARD";
//Initiates all the children of the JFrame. Uses CardLayout.
public static void init() {
//Initiates the JFrame
JFrame frame = new JFrame("Nations");
//Initiates the first card and its children
JPanel menuPanel = new JPanel();
JButton newGameBtn = new JButton("New Game");
JLabel noteOne = new JLabel("Panel 1");
//Adds the children of the first card into the component heiarchy
menuPanel.add(newGameBtn);
menuPanel.add(noteOne);
//Adds all event listeners on the first card
newGameBtn.addActionListener(new NewGame());
//Initiates the second card and its children
JPanel gamePanel = new JPanel();
JLabel noteTwo = new JLabel("Panel 2");
//Adds the children of the second card into the component heiarchy
gamePanel.add(noteTwo);
//Adds the cards to the deck
deck.add(menuPanel);
deck.add(gamePanel);
//Adds the deck to the JFrame
frame.add(deck);
//Sets up the CardLayout
deck.setLayout(new CardLayout());
deckShuffle.addLayoutComponent(frame, MENUCARD);
deckShuffle.addLayoutComponent(frame, GAMECARD);
//Sets up JFrame behavior and renders the application
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
public static void setWindow(String PLACEHOLDER) {
CardLayout cl = (CardLayout)(deck.getLayout());
cl.show(deck, PLACEHOLDER);
deck.revalidate();
deck.repaint();
}
private static class NewGame implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
NationsApp.setWindow(GAMECARD);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
NationsApp.init();
}
});
}
}
非常感謝您的時間,
解決:
我通過應對來自CardLayoutDemo類結構由camickr給出the link進行了廣泛的變化(謝謝camickr爲你的幫助)。
這裏是我的解決方案:
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package nationsapp;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
*
* @author StephenAHyberger
*/
public class NationsApp implements ActionListener {
//Creates a JPanel to implement a CardLayout
JPanel deck;
//Creates constraints for the CardLayout
final static String MENUCARD = "MENUCARD";
final static String GAMECARD = "GAMECARD";
public void init(Container pane) {
//Creates the first card
JPanel menuCard = new JPanel();
JButton newGameBtn = new JButton("New Game");
menuCard.add(new JLabel("Panel 1"));
menuCard.add(newGameBtn);
//Adds EventListeners to the first card
newGameBtn.addActionListener(this);
//Creates the second card
JPanel gameCard = new JPanel();
gameCard.add(new JLabel("Panel 2"));
//Creates the deck for the cards
deck = new JPanel(new CardLayout());
deck.add(menuCard, MENUCARD);
deck.add(gameCard, GAMECARD);
pane.add(deck);
}
private static void render() {
//Create and set up the window
JFrame frame = new JFrame("Nations");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create application class
NationsApp app = new NationsApp();
app.init(frame.getContentPane());
//Display the window
frame.pack();
frame.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
CardLayout cl = (CardLayout)(deck.getLayout());
cl.show(deck, GAMECARD);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
render();
}
});
}
}
'deckShuffle'從未被設置爲任何面板的佈局管理器。有一個工作['CardLayout'](http://download.oracle.com/javase/8/docs/api/java/awt/CardLayout.html)顯示在[這個答案](http://stackoverflow.com /一個/418556分之5786005)。 –
[Swing教程](http://docs.oracle.com/javase/tutorial/uiswing/TOC.html)其中還包含一個工作示例?不僅如此,Swing教程可以用作其他Swing基礎的參考。 – camickr