[英]Swing: why does JFormattedTextField adds “,” on focus lost
[英]Why JFormattedTextField does not suppport actionPerformed
我的表單中有一個JFormattedTextField
,我希望在用戶按下輸入后輸入值后,它應該移動到下一個字段。 但經過我的努力,我沒有這樣做。 為了實現這一點,我已經將一個ActionListener
附加到JFormattedTextField
但按Enter鍵從不觸發事件。 為什么? 任何人都可以幫忙嗎?
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
}
您需要添加一個Action
:
Action action = new AbstractAction()
{
@Override
public void actionPerformed(ActionEvent e)
{
//preform your action here.
}
};
ftf.addActionListener( action );
當按下回車鍵時執行動作。
你可以通過任何一種方式實現。
1.有這個一個簡單的一招。 用所有按鈕構造框架后,執行以下操作:
frame.getRootPane().setDefaultButton(submitButton);
對於每個幀,您可以設置一個默認按鈕,該按鈕將自動偵聽Enter鍵(可能還有其他一些我不知道的事件)。 當您在該幀中按Enter鍵時,將調用ActionListeners的actionPerformed()方法。
2. JFormattedTextField
被設計為像JButton一樣使用ActionListener
。 請參閱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 );
現在,使用Enter
鍵時會觸發該事件。
此外,即使您不想將按鈕設置為默認按鈕,您還可以使用按鈕共享監聽器。
JButton button = new JButton("Do Something");
button.addActionListener( action );
注意,此示例使用Action,它實現ActionListener,因為Action是具有附加功能的較新API。 例如,您可以禁用Action,它將禁用文本字段和按鈕的事件。
您可以將Enter
鍵綁定到JFormattedTextField
而不是ActionListener
,並在按下Enter
時調用AbstractAction
:
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);
}
});
當JFormattedTextField
聚焦時,它將在actionPerformed
方法中處理Enter
鍵
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.