Question

在textPaneKeyTyped(java.awt.event.keyEvent evt)方法中，我编写了一些代码，以便在键入开头时自动关闭括号。当用户在textPane中输入时，我添加了一些用于删除右括号的代码，但它没有做任何事情

这是一个有效的例子：

package test;

import java.awt.event.ActionEvent;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.JTextPane;
import javax.swing.KeyStroke;
import javax.swing.text.BadLocationException;


public class NewJFrame extends javax.swing.JFrame {

    /** Creates new form NewJFrame */
    public NewJFrame() {
        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() {

        jPanel1 = new javax.swing.JPanel();
        jScrollPane1 = new javax.swing.JScrollPane();
        textPanel = new javax.swing.JTextPane();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        textPanel.addKeyListener(new java.awt.event.KeyAdapter() {
            public void keyTyped(java.awt.event.KeyEvent evt) {
                textPanelKeyTyped(evt);
            }
        });
        jScrollPane1.setViewportView(textPanel);

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(19, 19, 19)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 254, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(27, Short.MAX_VALUE))
        );

        getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);

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

private void textPanelKeyTyped(java.awt.event.KeyEvent evt) {
// TODO add your handling code here:
     Action action1 = new AbstractAction() {

        @Override
        public void actionPerformed(ActionEvent e) {
            textModel = (JTextPane) e.getSource();
            try {
                int position2 = textModel.getCaretPosition();
                textModel.getDocument().remove(position2, 1);
                textModel.getDocument().insertString(position2, ")", null);

            } catch (Exception e1) {}
        }

};
    Action action = new AbstractAction() {

            @Override
            public void actionPerformed(ActionEvent e) {
                int position = textModel.getCaretPosition();
                textModel.replaceSelection("()");
                textModel.setCaretPosition(position+1);
            }

    };

    String key =  "typed (";
    String key1 = "typed )";
    textPanel.getInputMap().put(KeyStroke.getKeyStroke(key), key);
    textPanel.getInputMap().put(KeyStroke.getKeyStroke(key1), key1);
    textPanel.getActionMap().put(key, action);
    textPanel.getActionMap().put(key1, action1);


}

    /**
     * @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(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.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 NewJFrame().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextPane textPanel;
    // End of variables declaration
}

自动关闭支架的代码有效.. 问题是更换关闭支架：它打印＆＃39;）＆＃39;就在那之前，有一个＆＃39;（＆＃39;。如果我能够打印＆＃39;）＆＃39;在任何时候，我应该如何编辑我的代码？谢谢。

Answer 1

阻止KeyStroke的使用永远不是一个好主意。你永远不知道何时可能需要手动输入“）”。谁在乎用户是否输入“）”。如果它在语法上不正确，那么它们最终会出现编译错误。聪明的用户将意识到所有需要做的就是为他们输入“（”和“）”。

但是，如果您确实想要阻止输入给定字符，则可以使用Key Bindings而不是KeyListener。

例如：

KeyStroke ignore = KeyStroke.getKeyStroke(')');
textPane.getInputMap().put(ignore, "none");

有关Key Bindings的更多信息，请阅读Swig教程。我在你之前的一个问题中给了你一个链接。保持教程链接方便基础。当您查看本教程的目录（“trail”）时，您会在How to Use Key Bindings找到一个部分。

同样适用于你的“（”行动你可以使用：

textPane.replaceSelection("()");

如何在键入时正确删除自动添加的右括号

1 个答案: