Question

我的表单中有一个JFormattedTextField，我希望在用户按下输入后输入值后，应该移到下一个字段。但经过我的努力，我没有这样做。为实现这一目标，我已将ActionListener附加到JFormattedTextField但按Enter键从不触发事件。为什么？有人可以帮忙吗？

public class Test extends javax.swing.JFrame {

    /**
     * Creates new form Test
     */
    public Test() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        ftf = new javax.swing.JFormattedTextField();
        jLabel1 = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        ftf.setFormatterFactory(new javax.swing.text.DefaultFormatterFactory(new javax.swing.text.NumberFormatter(new java.text.DecimalFormat("#0.00"))));
        ftf.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                ftfActionPerformed(evt);
            }
        });

        jLabel1.setText("JFormattedTextField Action Test");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(38, 38, 38)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(ftf, javax.swing.GroupLayout.PREFERRED_SIZE, 156, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 195, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(167, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(10, 10, 10)
                .addComponent(jLabel1)
                .addGap(18, 18, 18)
                .addComponent(ftf, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(238, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    private void ftfActionPerformed(java.awt.event.ActionEvent evt) {                                    
        // TODO add your handling code here:
        JOptionPane.showMessageDialog(this, "Enter Pressed");
    }                                   

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Test.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Test.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Test.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Test.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Test().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JFormattedTextField ftf;
    private javax.swing.JLabel jLabel1;
    // End of variables declaration                   
}

Answer 1

您需要添加+：

Action

按下回车键时执行操作。

Answer 2

你可以通过任何一种方式完成。

1。这有一个简单的伎俩。用所有按钮构造框架后，执行以下操作：

frame.getRootPane().setDefaultButton(submitButton);

对于每个帧，您可以设置一个默认按钮，该按钮将自动收听Enter键（可能还有其他一些我不知道的事件）。当您在该帧中按Enter键时，将调用ActionListeners的actionPerformed（）方法。

2。 JFormattedTextField被设计为像JButton一样使用ActionListener。请参阅JFormattedTextField的addActionListener（）方法。

例如：

Action action = new AbstractAction()
{
    @Override
    public void actionPerformed(ActionEvent e)
    {
        System.out.println("some action");
    }
};

JFormattedTextField textField = new JFormattedTextField(10);
textField.addActionListener( action );

现在，当使用Enter密钥时会触发事件。

此外，即使您不想将按钮设为默认按钮，您还可以使用按钮分享听众。

JButton button = new JButton("Do Something");
button.addActionListener( action );

注意，此示例使用Action，它实现ActionListener，因为Action是具有附加功能的较新API。例如，您可以禁用Action，它将禁用文本字段和按钮的事件。

Answer 3

而不是ActionListener，您可以将Enter键绑定到JFormattedTextField，并在按下AbstractAction时调用Enter：

InputMap inputMap = ftf.getInputMap(JComponent.WHEN_FOCUSED);
        inputMap.put(KeyStroke.getKeyStroke((char) KeyEvent.VK_ENTER), "enterPressed");
        ftf.getActionMap().put("enterPressed", new AbstractAction() {

            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println("actionPerformed");
                ftfActionPerformed(e);
            }
        });

当JFormattedTextField成为焦点时，它会在Enter方法中处理actionPerformed键

为什么JFormattedTextField不支持actionPerformed

3 个答案: