[英]How to use JButtons with cardlayout
I have been attempting a nice UI for fun because I am very new to java. 我一直在尝试一个不错的UI,因为我对Java很陌生。 I have learned how the cardlayout works, but I have an issue with the JButtons not showing the correct card in my cardlayout. 我已经了解了cardlayout的工作原理,但是JButtons在我的cardlayout中没有显示正确的卡片时遇到了问题。 I am using ItemListeners with Actionlisteners to change the cardlayout. 我正在将ItemListeners与Actionlisteners一起使用来更改卡片布局。 here is the code that i have... 这是我的代码...
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class LoginCards implements ItemListener, ActionListener
{
JPanel cards; //a panel that uses CardLayout
JButton login1;
JButton login2;
JButton login3;
final static String STUDENTPANEL = "Student";
final static String INSTRUCTORPANEL = "Instructor";
final static String DEPTSTAFFPANEL = "Department Staff";
final static String DEPTSTAFFOPTIONS = "";
final static String INSTRUCTOROPTIONS = "";
final static String STUDENTOPTIONS ="";
public void addComponentToPane(Container pane)
{
login1 = new JButton("Login");
login2 = new JButton("Login");
login3 = new JButton("Login");
login1.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
CardLayout cl = (CardLayout) (cards.getLayout());
cl.show(cards, STUDENTOPTIONS);
}
});
login2.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
CardLayout cl = (CardLayout) (cards.getLayout());
cl.show(cards, INSTRUCTOROPTIONS);
}
});
login3.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
CardLayout cl = (CardLayout) (cards.getLayout());
cl.show(cards, DEPTSTAFFOPTIONS);
}
});
//Put the JComboBox in a JPanel to get a nicer look.
JPanel comboBoxPane = new JPanel(); //use FlowLayout
String comboBoxItems[] = { STUDENTPANEL, INSTRUCTORPANEL, DEPTSTAFFPANEL };
JComboBox cb = new JComboBox(comboBoxItems);
cb.setEditable(false);
cb.addItemListener(this);
comboBoxPane.add(cb);
//Create the "cards".
JPanel card1 = new JPanel();
card1.add(new JLabel("UserName: "));
card1.add(new JTextField("Student UserName", 20));
card1.add(new JLabel("Password: "));
card1.add(new JPasswordField(20));
card1.add(login1);
JPanel card2 = new JPanel();
card2.add(new JLabel("UserName: "));
card2.add(new JTextField("Instructor UserName", 20));
card2.add(new JLabel("Password: "));
card2.add(new JPasswordField(20));
card2.add(login2);
JPanel card3 = new JPanel();
card3.add(new JLabel("UserName: "));
card3.add(new JTextField("Dept. Staff UserName", 20));
card3.add(new JLabel("Password: "));
card3.add(new JPasswordField(20));
card3.add(login3);
JPanel instructorViewCard = new JPanel();
instructorViewCard.add(new JLabel("instructorViewCard"));
JPanel deptStaffViewCard = new JPanel();
deptStaffViewCard.add(new JLabel("deptStaffViewCard"));
JPanel studentViewCard = new JPanel();
studentViewCard.add(new JLabel("studentViewCard"));
//Create the panel that contains the "cards".
cards = new JPanel(new CardLayout());
cards.add(card1, STUDENTPANEL);
cards.add(card2, INSTRUCTORPANEL);
cards.add(card3, DEPTSTAFFPANEL);
cards.add(deptStaffViewCard, DEPTSTAFFOPTIONS);
cards.add(studentViewCard, STUDENTOPTIONS);
cards.add(instructorViewCard, INSTRUCTOROPTIONS);
pane.add(comboBoxPane, BorderLayout.PAGE_START);
pane.add(cards, BorderLayout.CENTER);
}
public void itemStateChanged(ItemEvent evt)
{
CardLayout cl = (CardLayout)(cards.getLayout());
cl.show(cards, (String)evt.getItem());
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event dispatch thread.
*/
private static void createAndShowGUI()
{
//Create and set up the window.
JFrame frame = new JFrame("OUR System");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
LoginCards demo = new LoginCards();
demo.addComponentToPane(frame.getContentPane());
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args)
{
/* Use an appropriate Look and Feel */
try
{
//UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
}
catch (UnsupportedLookAndFeelException ex)
{
ex.printStackTrace();
}
catch (IllegalAccessException ex)
{
ex.printStackTrace();
}
catch (InstantiationException ex)
{
ex.printStackTrace();
}
catch (ClassNotFoundException ex)
{
ex.printStackTrace();
}
/* Turn off metal's use of bold fonts */
UIManager.put("swing.boldMetal", Boolean.FALSE);
//Schedule a job for the event dispatch thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
createAndShowGUI();
}
});
}
@Override
public void actionPerformed(ActionEvent e)
{
// TODO Auto-generated method stub
}
}
If you notice that no matter which button you are on (1,2, or 3) you always get the same card layout with the label "instructorViewCard". 如果您注意到无论处于哪个按钮上(1、2或3),则始终获得带有标签“ instructorViewCard”的相同卡布局。 I want to be able to view the studentViewCard with the login1 button and so on. 我希望能够使用login1按钮查看studentViewCard,依此类推。 I am just not sure what I am missing to do this. 我只是不确定我缺少这样做的地方。 Does anyone see the answer? 有人看到答案吗? Is there a better way? 有没有更好的办法?
You've not given a unique name to the card identifiers for the dept staff, instructor and student options... 您尚未为部门职员,讲师和学生选项的卡标识符指定唯一的名称...
final static String DEPTSTAFFOPTIONS = "";
final static String INSTRUCTOROPTIONS = "";
final static String STUDENTOPTIONS = "";
This basically means it's using instructorViewCard
as the same view for each of the elements (been the last one added), as the cards are managed by a Map
internally... 这基本上意味着它对每个元素都使用了instructorViewCard
作为相同的视图(在最后添加的元素之后),因为这些卡片是由Map
内部管理的...
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.