我正在使用(或試圖)使用MVC設計模式。 所以我有一個UI類,只是介意自己的業務和一個控制器,以及控制視圖。Java Swing ActionListener不工作並停止構造函數
當我在控制器類中註冊一個ActionListener時,它不起作用。調試似乎顯示,構造函數甚至在調用JDialog的構造函數後都沒有變化。
作爲描述並沒有太大的senese,這裏有我的課:
這是視圖:
package view;
import javax.swing.*;
import java.awt.*;
/**
* Created by Timbo on 04.05.17.
* This window will be used to authenticate library members and allow them to access staff functions
*/
public class AuthenticationWindow
{
/**
* The window that holds the authentication content
*/
private JDialog _window;
/**
* This Panel holds the fields required for the input of username and password
*/
private JPanel _textFieldPanel;
/**
* This panel will hold the buttons
*/
private JPanel _buttonPanel;
/**
* The textfield in which the username can be entered
*/
private JTextField _userName;
/**
* The field, in which the password can be entered
*/
private JPasswordField _password;
/**
* Holds a string to hint for the username
*/
private JLabel _usernameHint;
/**
* Holds a string to hint for the password
*/
private JLabel _passwordHint;
/**
* A Button that will trigger the login process
*/
private JButton _confirm;
/**
* A Button that will cancel the login process
*/
private JButton _cancel;
/**
* Creates a new Authentication Window in which a user can authenticate to get staff clearance
* @param parent The parent frame of this Window
*/
public AuthenticationWindow(Frame parent)
{
//Initialize all the components
_window = new JDialog(parent, "Please Authenticate", true);
_textFieldPanel = new JPanel(new GridLayout(2, 2));
_buttonPanel = new JPanel(new FlowLayout());
_userName = new JTextField();
_password = new JPasswordField();
_passwordHint = new JLabel("Password");
_usernameHint = new JLabel("Username");
_confirm = new JButton("Confirm");
_cancel = new JButton("Cancel");
//Assemble the textfield panel
_textFieldPanel.add(_usernameHint);
_textFieldPanel.add(_userName);
_textFieldPanel.add(_passwordHint);
_textFieldPanel.add(_password);
//Assemble the button panel
_buttonPanel.add(_cancel);
_buttonPanel.add(_confirm);
//Assemble the window
_window.setLayout(new BoxLayout(_window.getContentPane(), BoxLayout.PAGE_AXIS));
_window.add(_textFieldPanel);
_window.add(_buttonPanel);
//Configure the window
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
_window.setLocation(dim.width/2-_window.getSize().width/2, dim.height/2-_window.getSize().height/2);
_window.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
_window.pack();
//Show window
_window.setVisible(true);
}
//All the getter methods for this class
public JDialog getWindow()
{
return _window;
}
public JTextField getUsernameInput()
{
return _userName;
}
public JPasswordField getPasswordInput()
{
return _password;
}
public JButton getConfirm()
{
return _confirm;
}
public JButton getCancel()
{
return _cancel;
}
}
這是負責的視圖控制器:
package controller.start.viewController;
import view.AuthenticationWindow;
import view.ErrorScreen;
import javax.swing.*;
import java.awt.*;
import java.util.Observable;
/**
* Created by Timbo on 05.05.17.
* This is the controller class for the Authentication window. It handles updates and functionality for the view
*/
public class AuthenticationWindowController extends Observable
{
private static final char[] PASSWORD = {'T', 'o', 'r', 'v', 'a', 'l', 'd', 's'};
/**
* The view that holds the components
*/
private AuthenticationWindow _ui;
/**
* The parent frame of this view
*/
private Frame _parent;
public AuthenticationWindowController(Frame parent)
{
_ui = new AuthenticationWindow(parent);
_parent = parent;
registerListener();
}
private void registerListener()
{
_ui.getConfirm().addActionListener(e -> {checkInput();});
_ui.getCancel().addActionListener(e -> {_ui.getWindow().dispose(); System.out.println("Window disposed");});
}
/**
* This method checks the input and gives feedback to the user in case the input was wrong
* If the input was correct the user is being authenticated as staff and can access the staff view in the start window
*/
private void checkInput()
{
String username = _ui.getUsernameInput().getText();
char[] password = _ui.getPasswordInput().getPassword();
if (username.isEmpty())
{
new ErrorScreenController(_parent, ErrorScreen.USERNAME_ERROR);
}
else if (password.length == 0)
{
new ErrorScreenController(_parent, ErrorScreen.PASSWORD_ERROR);
}
else if ((username.equalsIgnoreCase("linus")) || (password.equals(PASSWORD)))
{
this.setChanged();
this.notifyObservers();
}
else
{
new ErrorScreenController(_parent, ErrorScreen.WRONG_CREDENTIALS);
}
}
}
在構造函數中,actionListener不會觸發。 如果我爲_parent = parent行設置了一個斷點,那麼當我關閉作爲AuthenticationWindow的JDialoge時,程序只會停止。
有趣的是我有兩個其他類以這種方式工作。如果需要,我會在這裏發佈。請告訴我。
謝謝你的幫助!
太棒了!謝謝!我不確定哪種方法會停止線程。將對話框放在一個新的線程中是否也一樣? – Timbo
編號Swing是單線程庫。還請閱讀我已添加到我的答案中的一些其他提示。 –