[英]How do I get my CardLayout UI to update?
我正在尝试使用CardLayout为游戏构建UI,尽管在我的卡片切换方法中使用了revalidate()和repaint(),但我似乎无法更新它。 该程序旨在作为使用CardLayout在JFrame中切换JPanels的概念证明,因为如果我能够成功完成一次,则可以与其他JPanels重复该过程。 不知道该错误是否与线程有关或只是更新UI。 无论如何,这是我的代码:
/*
* 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 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();
}
});
}
}
非常感谢您的宝贵时间,
解决了:
我通过在camickr给定的链接中处理CardLayoutDemo中的类结构进行了广泛的更改(感谢camickr的帮助)。
这是我的解决方案:
/*
* 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();
}
});
}
}
您课程的整个结构是错误的。 对于这一点,您不应该使用所有静态变量和方法。
deckShuffle.addLayoutComponent(frame, MENUCARD);
deckShuffle.addLayoutComponent(frame, GAMECARD);
以上是不需要的。
只需使用add(...)
方法即可将组件添加到面板中,就像使用其他布局管理器一样。
deck.add(menuPanel, ...);
deck.add(gamePanel, ...);
您需要指定CardLayout要使用的约束。
尝试交换卡时,不需要revalidate()和repaint()。
我建议您先阅读Swing教程中有关如何使用CardLayout的部分作为工作示例。 该示例将向您展示如何更好地构建代码以遵循Swing约定。 然后,您可以根据需要修改工作示例。
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