java - 在 JDialogs 之间创建 Swing 动画

Question

大家好，首先，我想做的是在用户按下输入对话框中的 OK 按钮和他已成功登录的数据库响应之间运行动画。

我有一个类负责设置 UI 和动画，并且分别有一个单独的类用于登录对话框和数据库。我曾尝试使用 boolean 值制作动画，但它只是卡住了，只有在我关闭对话框后才会动画。我该如何正确设置。这是我尝试过的以及两个类中的相关代码。谢谢

对于登录对话框，loginInput.class:

   class LoginInput extends JDialog {
    private JPanel myPanel;
    private JPanel buttons_panel;
    private JTextField username;
    private JPasswordField password;
    private JLabel username_label;
    private JLabel password_label;
    private JButton ok;
    private JButton cancel;
    protected static boolean succeeded;


    public LoginInput(JFrame parent){
        super(parent,"Login", true);
        initUI(parent);

    }

    private void initUI(JFrame parent) {

       myPanel = new JPanel(new GridLayout(3,2,1,1));
       buttons_panel = new JPanel(new FlowLayout());

       username_label = new JLabel("Username: ");
       password_label = new JLabel("Password: ");
       username = new JTextField(20);
       password = new JPasswordField(20);

       ok = new JButton("Ok");
       ok.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {

               LoginDB db = new LoginDB(getUsername(), getPassword());

               try {
                    db.createConn();
                    db.execute();

                } catch (SQLException ex) {
                    Logger.getLogger(LoginInput.class.getName()).log(Level.SEVERE, null, ex);
                }

               /*check if login input is correct and display information dialog accordingly*/
              // try {
                 // if (db.checkUserInput(getUsername(), getPassword())){
                   if(isSucceeded() == true ){
                      JOptionPane.showMessageDialog(LoginInput.this, "Hi" + getUsername()+ "! " +
                              "You have successfully Logged in", "XLite", JOptionPane.INFORMATION_MESSAGE);
                      succeeded = true;
                      dispose();

                  }else{

                      JOptionPane.showMessageDialog(LoginInput.this,"Invalid username or password","Login",JOptionPane.ERROR_MESSAGE);
                    // reset username and password
                    username.setText("");
                    password.setText("");
                    succeeded = false;
                  }
               // } catch (SQLException ex) {
                    //Logger.getLogger(LoginInput.class.getName()).log(Level.SEVERE, null, ex);
                //}
               }               
        });

        cancel = new JButton("Cancel");
        cancel.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
               dispose();
            }
        });

        myPanel.add(username_label);
        myPanel.add(username);
        myPanel.add(password_label);
        myPanel.add(password);

        buttons_panel.add(ok);
        buttons_panel.add(cancel);

        getContentPane().add(myPanel, BorderLayout.CENTER);
        getContentPane().add(buttons_panel, BorderLayout.PAGE_END);

        pack();
        setResizable(false);
        setLocationRelativeTo(parent);
    }


    /*return the username from the textbox*/
    public String getUsername(){
        return username.getText().trim();
    }

    /*return the password from the textbox*/
    public String getPassword(){
        return new String(password.getPassword());
    }

    /*return login status*/
     public boolean isSucceeded() {
        return succeeded;
    }
}

对于主类:

  public myTest() {
        initComponents();
        String image_name = "/my/myTest/resource/Envelope.jpg";
        Image = new ImageIcon(this.getClass().getResource(image_name));
        currentImage = Image.getImage();
        prepareImage(currentImage, this);
        envelope.setX(xpos); //envelope is a class with getters and setters for x and y positions
        envelope.setY(ypos);
        timer = new Timer(150, this);
        //timer.start();
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        loginClient();  //method to call the login dialog class
        /*if (login_page.animate == true) {
            timer.start();
        } */



    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new myTest().setVisible(true);
            }
        });
    }

    private void loginClient() {
        login_page = new LoginInput(this);  // login dialog class
        login_page.setSize(220, 150);
        login_page.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        Dimension d = jPanel1.getSize();
        envelope.setX(envelope.getX() + xmove);
        envelope.setY(envelope.getY() + ymove);
        if (envelope.getX() > d.getWidth() - imageWidth) {
            xmove *= -0.1;
        }
        if (xpos < 1) {
            xmove *= -1;
        }
        if (envelope.getY() <= d.getHeight() - imageHeight) {
            ymove *= -1;
        }
        repaint();
    }

    @Override
    public void paint(Graphics g) {
        super.paint(g);
        g.drawImage(currentImage, envelope.getX(), envelope.getY(), this);
        g.dispose();
    }

对于 loginDB 类:

public class LoginDB extends SwingWorker<Object, Object> {
 public Connection conn;
  String driver;
  String URL;
 //username and password to check database
  String username;
  String password;

  //remporary user name and password to hold data
  String user;
  String pwd;

  myTest testview = new myTest();
  Timer timer;
boolean result = false;


  public LoginDB(String username, String password){
       this.user = username;
       this.pwd = password;


  }


    /*create a database connection object with the connection driver Manager*/
    public void createConn() throws SQLException{
        String filename = "C:/PROJECTS/com/me/login_client/LoginDB";
            driver = "sun.jdbc.odbc.JdbcOdbcDriver";
           //URL = "jdbc:odbc:XliteLoginDB";
           URL = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)}; DBQ=";
           URL += filename.trim() + ";DriverID=22;READONLY=true}";
            username = "";
            password = "";

        try {
            Class.forName(driver);
            conn = DriverManager.getConnection(URL, username, password);

        } catch (ClassNotFoundException ex) {
            Logger.getLogger(LoginDB.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public boolean checkUserInput(String username, String password) throws SQLException{
        boolean result;

        Statement query = conn.createStatement();
        ResultSet rs = query.executeQuery("SELECT Username, Password FROM XliteLogin where " +
                "Username='" + username + "'AND Password='" + password +"'");

            //ResultSet rs = query.executeQuery("SELECT FROM XliteLogin where " +
               // "Username='" + username + "'AND Password= '" + password +"'");
        if(rs.next()){
            result = true;
        }else{
            result =false;
        }
        query.close();
        conn.close();

        return result;
    }

    @Override
    protected Object doInBackground() throws Exception {

          publish(checkUserInput(user,pwd));
          return checkUserInput(user,pwd);
    }


    //@Override
        protected void process(boolean chunks) {               
           testview.timer.start();
        }


    @Override
        protected void done(){

          testview.timer.start();
        }


}

编辑:似乎无法从 SwingWorker 类或主类之外的任何其他类启动计时器。

Answer 1

您正在阻止 event dispatch thread .相反，从 doInBackground() 中的 SwingWorker 访问数据库并在 process() 中同步动画，如本 example 所示.

补充:关于动画，示例的process()实现将新发布的数据附加到JTextArea，但后台线程也可能通过调用产生动画事件设置进度()。因为监听器在 EDT 上得到通知，所以任何组件都可以更新，而不仅仅是 JProgressBar。