如何更改组件之间的焦点
[英]How can I change focus between components
问题描述
I created A Jframe that consists of Jbutton (Ok),Jbutton(cancel) , Jtextfield and a Jtable .
我创建了一个由 Jbutton (Ok),Jbutton(cancel), Jtextfield 和一个 Jtable 组成的 Jframe。 I want when press on OK button , focus changes to Jtextfield, and when press a gain , focus change to JTable .我希望当按下 OK 按钮时，焦点更改为 Jtextfield，按下增益时，焦点更改为 JTable 。
How can I change focus between Components ?如何在组件之间改变焦点？
this what I have tried :这是我尝试过的：
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
try{
Robot robot = new Robot();
robot.keyPress(KeyEvent.VK_TAB);
robot.keyRelease(KeyEvent.VK_TAB);
KeyboardFocusManager.getCurrentKeyboardFocusManager().focusNextComponent();
}
catch (AWTException ex) {
Logger.getLogger(testSoso.class.getName()).log(Level.SEVERE, null, ex);
}
}
it focus only on JTextfield but does not change focus to JTable它只关注 JTextfield 但不会将焦点转移到 JTable
edit: I also tried :编辑：我也试过：
KeyboardFocusManager.getCurrentKeyboardFocusManager().focusNextComponent(JTable2);
but did not work但没有用
this is the whole code :这是整个代码：
package javaapplication5;
import java.awt.AWTException;
import java.awt.KeyboardFocusManager;
import java.awt.Robot;
import java.awt.event.KeyEvent;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @author Dell
*/
public class javaApp5 extends javax.swing.JFrame {
/**
* Creates new form testSoso
*/
public javaApp5() {
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() {
jButton1 = new javax.swing.JButton();
jTextField1 = new javax.swing.JTextField();
jScrollPane2 = new javax.swing.JScrollPane();
jTable2 = new javax.swing.JTable();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
jButton1.setText("Ok");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jTable2.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}
},
new String [] {
"Title 1", "Title 2", "Title 3", "Title 4"
}
));
jScrollPane2.setViewportView(jTable2);
jButton2.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
jButton2.setText("cancel");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap(40, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 374, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(60, 60, 60))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jTextField1)
.addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton2, javax.swing.GroupLayout.DEFAULT_SIZE, 103, Short.MAX_VALUE))
.addGap(192, 192, 192))))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(47, 47, 47)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 167, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(65, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// for(int i=0;i<4;i++){
// jTable2.addRowSelectionInterval(0,0);
try {
Robot robot = new Robot();
robot.keyPress(KeyEvent.VK_TAB);
robot.keyRelease(KeyEvent.VK_TAB);
KeyboardFocusManager.getCurrentKeyboardFocusManager().focusNextComponent();
} catch (AWTException ex) {
Logger.getLogger(javaApp5.class.getName()).log(Level.SEVERE, null, ex);
}
// }
}
/**
* @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(javaApp5.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(javaApp5.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(javaApp5.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(javaApp5.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new javaApp5().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTable jTable2;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
1 个解决方案
解决方案1
0 2021-10-24 13:30:34
When the user clicks on the OK button, keyboard focus is transferred to the button.当用户点击OK按钮时，键盘焦点转移到按钮上。 Hence simulating pressing the TAB key via class Robot will transfer keyboard focus to the next component which is the cancel button.因此，通过类Robot模拟按下 TAB 键会将键盘焦点转移到下一个组件，即取消按钮。
Simply calling method requestFocusInWindow worked for me.简单地调用方法requestFocusInWindow对我有用。 I added a boolean class member variable, named txtFld , in order to know which component needs to get the focus.我添加了一个布尔类成员变量，名为txtFld ，以便知道哪个组件需要获得焦点。
Here is my version of method jButton1ActionPerformed这是我的方法jButton1ActionPerformed版本
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
if (txtFld) {
jTable2.requestFocusInWindow();
}
else {
jTextField1.requestFocusInWindow();
}
txtFld = !txtFld;
}
No need for class Robot nor for class KeyboardFocusManager .不需要类Robot也不需要类KeyboardFocusManager 。
For completeness, here is your code with my changes.为了完整起见，这是您的代码和我的更改。
package javaapplication5;
public class javaApp5 extends javax.swing.JFrame {
/**
* Creates new form testSoso
*/
public javaApp5() {
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() {
jButton1 = new javax.swing.JButton();
jTextField1 = new javax.swing.JTextField();
jScrollPane2 = new javax.swing.JScrollPane();
jTable2 = new javax.swing.JTable();
jButton2 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
jButton1.setText("Ok");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
jTable2.setModel(new javax.swing.table.DefaultTableModel(
new Object[][]{{null, null, null, null},
{null, null, null, null},
{null, null, null, null},
{null, null, null, null}},
new String[]{"Title 1", "Title 2", "Title 3", "Title 4"}));
jScrollPane2.setViewportView(jTable2);
jButton2.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
jButton2.setText("cancel");
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(layout
.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup().addContainerGap(40, Short.MAX_VALUE)
.addGroup(layout
.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING,
layout.createSequentialGroup().addComponent(jScrollPane2,
javax.swing.GroupLayout.PREFERRED_SIZE, 374,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(60, 60, 60))
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING,
layout.createSequentialGroup().addGroup(layout
.createParallelGroup(
javax.swing.GroupLayout.Alignment.TRAILING,
false)
.addComponent(jTextField1)
.addComponent(jButton1,
javax.swing.GroupLayout.DEFAULT_SIZE,
javax.swing.GroupLayout.DEFAULT_SIZE,
Short.MAX_VALUE)
.addComponent(jButton2,
javax.swing.GroupLayout.DEFAULT_SIZE, 103,
Short.MAX_VALUE))
.addGap(192, 192, 192)))));
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup().addGap(47, 47, 47)
.addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE,
167, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE,
32, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(
javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 30,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(
javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 30,
javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(65, Short.MAX_VALUE)));
pack();
}// </editor-fold>
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
if (txtFld) {
jTable2.requestFocusInWindow();
}
else {
jTextField1.requestFocusInWindow();
}
txtFld = !txtFld;
}
/**
* @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 | InstantiationException | IllegalAccessException
| javax.swing.UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
// </editor-fold>
// </editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new javaApp5().setVisible(true);
}
});
}
// Variables declaration - do not modify
private boolean txtFld;
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTable jTable2;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
By the way, if you are learning Swing , I recommend not using the GUI builder of your IDE.顺便说一句，如果您正在学习Swing ，我建议您不要使用您的 IDE 的 GUI 构建器。
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