问题描述
我正在处理一个小组项目,我是制作 GUI 的人,我认为用它练习会很好。该程序应该是一个披萨订购系统(非常标准的东西),我想要完成的是我有一个创建应用程序窗口的主类。在此窗口中是一个面板,它使用 cardlayout 和一个按钮,按下该按钮时会调用另一个专用于该面板的类中的另一个 JPanel,并将其作为卡片放置在布局中,以便正常来回交换。
到目前为止我拥有的是我希望调用的不同面板以及具有窗口和主卡片面板的主类。我可以让它在主类中创建的面板之间轻松切换,但是当我尝试使用其他类中的面板时,它只会在应该显示其他类的面板时切换到空白面板。
主类
package PizzaGUI;
import java.awt.EventQueue;
import java.awt.cardlayout;
import javax.swing.JFrame;
import javax.swing.*;
import java.awt.event.*;
import java.awt.Font;
public class PizzaSystem {
private JFrame frame;
Toppings toppingsPanel;
MainMenu menuPanel;
JButton loginBtn;
JPanel mainPanel;
cardlayout cl;
//MAIN
public static void main(String[] args) {
EventQueue.invokelater(new Runnable() {
public void run() {
try {
PizzaSystem window = new PizzaSystem();
window.frame.setVisible(true);
} catch (Exception e) {
e.printstacktrace();
}
}
});
}
//Constructor
public PizzaSystem() {
initialize();
}
//Initialize the GUI
private void initialize() {
cl = new cardlayout();
frame = new JFrame();
frame.setBounds(100,100,893,527);
frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
mainPanel = new JPanel();
mainPanel.setBounds(10,10,859,470);
frame.getContentPane().add(mainPanel);
mainPanel.setLayout(cl);
JPanel panel_2 = new JPanel();
mainPanel.add(panel_2,"test");
panel_2.setLayout(null);
JLabel lblNewLabel = new JLabel("It Worked");
lblNewLabel.setFont(new Font("Tahoma",Font.PLAIN,45));
lblNewLabel.setBounds(282,118,312,103);
panel_2.add(lblNewLabel);
JPanel panel_1 = new JPanel();
loginBtn = new JButton();
loginBtn.setText("Login");
loginBtn.setBounds(175,72,199,154);
loginBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
showCard("menu");
}
});
panel_1.add(loginBtn);
mainPanel.add(panel_1,"loginPanel");
JPanel menuPanel = new MainMenu();
mainPanel.add(menuPanel,"menu");
showCard("loginPanel");
}
//Call card matching the key
public void showCard(String key) {
cl.show(mainPanel,key);
}
}
以及带有面板的类之一(格式混乱但应该仍然可以工作)
package PizzaGUI;
import java.awt.Color;
import java.awt.Font;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.SwingConstants;
import javax.swing.border.BevelBorder;
public class MainMenu extends JPanel {
public MainMenu() {
JPanel panel1 = new JPanel();
panel1.setBounds(100,572);
panel1.setBackground(Color.PINK);
panel1.setLayout(null);
panel1.setVisible(true);
JLabel logoLabel = new JLabel("");
logoLabel.setBounds(10,110);
panel1.add(logoLabel);
ImageIcon image1 = new ImageIcon("C:\\Users\\thera\\eclipse-workspace\\PizzaSystem\\Images\\MamaJane1.png");
logoLabel.setIcon(new ImageIcon("C:\\Users\\thera\\eclipse-workspace\\PizzaSystem\\Images\\MamaJane.png"));
JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
tabbedPane.setBounds(133,113,548,402);
tabbedPane.setBorder(new BevelBorder(BevelBorder.LOWERED,null,null));
tabbedPane.setBackground(Color.PINK);
tabbedPane.setForeground(Color.GRAY);
tabbedPane.setFont(new Font("Tahoma",20));
tabbedPane.setToolTipText("");
panel1.add(tabbedPane);
JPanel panel = new JPanel();
tabbedPane.addTab("MENU",panel,null);
panel.setLayout(null);
//*******************************************************************************************************
//Pepperoni menu section
JLabel pizza1Image = new JLabel("IMAGE");
pizza1Image.setBounds(6,25,100);
panel.add(pizza1Image);
ImageIcon image2 = new ImageIcon("C:\\Users\\thera\\eclipse-workspace\\PizzaSystem\\Images\\Pepperoni.jpg");
Image pizza1 = image2.getimage();
Image pepperoni = pizza1.getScaledInstance(100,java.awt.Image.SCALE_SMOOTH);
image2 = new ImageIcon(pepperoni);
pizza1Image.setIcon(image2);
JLabel pepperoniLabel = new JLabel("PEPPERONI");
pepperoniLabel.setHorizontalAlignment(SwingConstants.CENTER);
pepperoniLabel.setBounds(110,86,48);
pepperoniLabel.setFont(new Font("Tahoma",12));
panel.add(pepperoniLabel);
JButton pepperoniOrderBtn = new JButton("ORDER");
pepperoniOrderBtn.setBounds(110,79,47);
panel.add(pepperoniOrderBtn);
pepperoniOrderBtn.addActionListener( new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
//Pepperoni End
JButton accountButton = new JButton("Account");
accountButton.setBounds(10,414,39);
accountButton.setBackground(Color.WHITE);
panel.add(accountButton);
JButton checkoutButton = new JButton("Checkout");
checkoutButton.setBounds(713,438,138,31);
panel.add(checkoutButton);
JButton logoutButton = new JButton("logout");
logoutButton.setBounds(10,463,52);
panel.add(logoutButton);
JTextArea txtrOrderInfoGoes = new JTextArea();
txtrOrderInfoGoes.setBounds(703,154,418);
txtrOrderInfoGoes.setText("Order Info\r\nGoes Here\r\n\r\nPepperoni Pizza x1\r\n$6.50");
panel.add(txtrOrderInfoGoes);
JButton clearOrderButton = new JButton("Clear");
clearOrderButton.setBounds(723,479,36);
panel.add(clearOrderButton);
JLabel titleLabel = new JLabel("MAMA JANE'S PIZZERIA");
titleLabel.setBounds(147,534,65);
panel.add(titleLabel);
titleLabel.setFont(new Font(titleLabel.getFont().getName(),50));
JLabel storeInfoLabel = new JLabel("<html>1234 Fakelane Rd <br> 10001,Faketopia,USA <br> 111-11-PIZZA <br> Mon-Fri 11AM to 10pm <br> Sat-Sun 10AM to 11pm");
storeInfoLabel.setBounds(10,130,274);
panel.add(storeInfoLabel);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(406,85,2,2);
panel.add(scrollPane);
logoutButton.addActionListener( new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
}
}
我不知道我哪里出错了,在过去的三个小时里我花了大约三个小时试图解决这个问题,并在互联网上搜索无济于事的答案,所以如果你能帮助我,提前感谢你。
另外,我提前道歉,我知道我最终会误用正确的编程术语,我明白有时只是忘记了正确称呼它们。
解决方法
所以,基本上,我去掉了所有的 null
布局和“手动”布局代码,因为它只会让你无休止地混乱,并在 {{ 的末尾添加了 add(panel1);
1}} 构造函数 - 正如我说过的,没有向 MainMenu
添加任何内容,因此,不会显示任何内容。
在您告诉我“这不是我想要的布局”之前,请理解我明白这一点,但我的意思是,MainMenu
布局是一个非常糟糕的主意,因为几乎整个 Swing API 都依赖于以一种或另一种方式布局管理器。
我很欣赏布局管理看起来像一个复杂的主题,但它解决了一些非常复杂的问题,值得花时间学习它们。请记住,您不必拘泥于单一的布局管理器,您可以使用组件组件来调整各个容器以满足其个人需求。
你可以看看:
- Layout using Java Swing
- Which Layout Manager to use?
- How I can do swing complex layout Java
- How to use Java Swing layout manager to make this GUI? *Which java swing layout should I use
关于如何设计复杂 UI 的一些想法。
您还应该看看Laying Out Components Within a Container
null