鍵入時如何正確刪除自動添加的右括號

Question

在textPaneKeyTyped(java.awt.event.keyEvent evt)方法中，我編寫了一些代碼，以在輸入第一個括號時自動將括號括起來。 當用戶在textPane中鍵入右括號時，我添加了一些代碼來刪除右括號，但它沒有任何作用

這是一個工作示例：

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
}

自動關閉方括號的代碼起作用。問題是替換了方括號：它在出現“（”之前打印“）”。如果我能夠在任何位置打印“）”時間，我應該如何編輯我的代碼？ 謝謝。

Answer 1

禁止使用KeyStroke從來不是一個好主意。 您永遠不知道何時需要手動輸入“）”。 誰在乎用戶是否輸入“）”。 如果在語法上不正確，則最終將出現編譯錯誤。 精明的用戶將意識到，接下來要做的就是鍵入“（”，然后為他們輸入“）”。

但是，如果確實想防止鍵入給定字符，則可以使用“ Key Bindings不是“ KeyListener”。

例如：

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

有Key Bindings更多信息，請閱讀Swig教程。 我給了您以前的問題之一的鏈接。 保持教程鏈接方便的基礎知識。 當您查看本教程的目錄（“線索”）時，將找到有關How to Use Key Bindings的部分。

同樣，對於您的“（”操作，您也可以使用：

textPane.replaceSelection("()");