Java JTextField，将插入符号位置设置为输入的结尾，而不突出显示整个字符串
我真的很困惑，因为我以为我解决了这个问题。我有一个自定义的JDialog，用户在其中输入一个等式，还有一些按钮可以在光标位置向输入中添加特殊字符。以下是我必须添加特殊字符的函数：Java JTextField，将插入符号位置设置为输入的结尾，而不突出显示整个字符串,java,swing,jtextfield,netbeans-7,caret,Java,Swing,Jtextfield,Netbeans 7,Caret,我真的很困惑，因为我以为我解决了这个问题。我有一个自定义的JDialog，用户在其中输入一个等式，还有一些按钮可以在光标位置向输入中添加特殊字符。以下是我必须添加特殊字符的函数： private void addSymbol(String symbol) { int pos = input.getCaretPosition(); String currInput = input.getText(); input.setText(currInput.subSequence
private void addSymbol(String symbol) {
int pos = input.getCaretPosition();
String currInput = input.getText();
input.setText(currInput.subSequence(0, pos) + symbol
+ currInput.subSequence(pos, currInput.length()));
input.requestFocus();
input.setCaretPosition(pos+1);
}
package bepe;
public class GetExpressionDialog extends javax.swing.JDialog {
/** Creates new form GetExpressionDialog */
public GetExpressionDialog(java.awt.Frame parent, boolean modal) {
super(parent, modal);
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() {
input = new javax.swing.JTextField();
andButton = new javax.swing.JButton();
orButton = new javax.swing.JButton();
stileButton = new javax.swing.JButton();
messageLabel = new javax.swing.JLabel();
submitButton = new javax.swing.JButton();
notButton = new javax.swing.JButton();
impliesButton = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent evt) {
formWindowClosing(evt);
}
});
andButton.setText("∧");
andButton.setToolTipText("You can also type \"&\"");
andButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
andButtonActionPerformed(evt);
}
});
orButton.setText("∨");
orButton.setToolTipText("You can also type \"|\"");
orButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
orButtonActionPerformed(evt);
}
});
stileButton.setText("⊢");
stileButton.setToolTipText("You can also type \"|-\"");
stileButton.setMargin(new java.awt.Insets(0, 0, 0, 0));
stileButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
stileButtonActionPerformed(evt);
}
});
messageLabel.setText("Enter the sequent you would like to prove:");
submitButton.setText("Submit");
submitButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
submitButtonActionPerformed(evt);
}
});
notButton.setText("¬");
notButton.setToolTipText("You can also type \"!\"");
notButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
notButtonActionPerformed(evt);
}
});
impliesButton.setText("→");
impliesButton.setToolTipText("You can also type \"->\"");
impliesButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
impliesButtonActionPerformed(evt);
}
});
org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(20, 20, 20)
.add(messageLabel))
.add(layout.createSequentialGroup()
.add(20, 20, 20)
.add(input, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 482, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.add(layout.createSequentialGroup()
.addContainerGap()
.add(stileButton, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 40, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(notButton, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 40, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(andButton, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 40, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(orButton, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 40, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.add(impliesButton, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 40, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, 200, Short.MAX_VALUE)
.add(submitButton)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.addContainerGap()
.add(messageLabel)
.add(8, 8, 8)
.add(input, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(stileButton)
.add(notButton)
.add(andButton)
.add(orButton)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
.add(impliesButton)
.add(submitButton)))
.addContainerGap())
);
pack();
}// </editor-fold>
private void stileButtonActionPerformed(java.awt.event.ActionEvent evt) {
addSymbol("⊢");
}
private void andButtonActionPerformed(java.awt.event.ActionEvent evt) {
addSymbol("∧");
}
private void orButtonActionPerformed(java.awt.event.ActionEvent evt) {
addSymbol("∨");
}
private void submitButtonActionPerformed(java.awt.event.ActionEvent evt) {
dispose();
}
private void notButtonActionPerformed(java.awt.event.ActionEvent evt) {
addSymbol("¬");
}
private void impliesButtonActionPerformed(java.awt.event.ActionEvent evt) {
addSymbol("→");
}
private void formWindowClosing(java.awt.event.WindowEvent evt) {
input.setText("");
}
private void addSymbol(String symbol) {
int pos = input.getCaretPosition();
String currInput = input.getText();
input.setText(currInput.subSequence(0, pos) + symbol
+ currInput.subSequence(pos, currInput.length()));
input.requestFocus();
input.setCaretPosition(pos+1);
}
public String getText() {
return input.getText();
}
public javax.swing.JLabel getMessage() {
return messageLabel;
}
/**
* @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(GetExpressionDialog.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(GetExpressionDialog.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(GetExpressionDialog.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(GetExpressionDialog.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the dialog */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
GetExpressionDialog dialog = new GetExpressionDialog(new javax.swing.JFrame(), true);
dialog.addWindowListener(new java.awt.event.WindowAdapter() {
@Override
public void windowClosing(java.awt.event.WindowEvent e) {
System.exit(0);
}
});
dialog.setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton andButton;
private javax.swing.JButton impliesButton;
private javax.swing.JTextField input;
private javax.swing.JLabel messageLabel;
private javax.swing.JButton notButton;
private javax.swing.JButton orButton;
private javax.swing.JButton stileButton;
private javax.swing.JButton submitButton;
// End of variables declaration
插入特殊字符的代码不是最有效的。您不需要替换整个文本。只需使用：
textField.replaceSelection( symbol );
另外，下次发布一个演示问题的帖子。对于一个简单的焦点问题，不需要发布300行代码。此外，发布带有非JDK类的代码也无助于我们运行代码。为了更快地获得更好的帮助，请发布一个。同意，非常重要的一点是查看SSCE如果您使用JDialog，其他所有内容都应该是黑色的。您为什么调用requestFocus（）？是否最好使按钮不可聚焦？我调用了requestFocus（），这样您就可以继续键入而无需再次单击文本字段。如果使按钮不可聚焦也有同样的效果，我可以尝试一下，但我不确定这是不是发生瘙痒的原因，直到现在它是正确的（一次太频繁了：）
textField.replaceSelection( symbol );