我有JFormattedTextField
的框架。我的简化代码可能如下所示:
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(100,100);
frame.setLayout(new GridLayout(2,2));
JFormattedTextField field1 = new JFormattedTextField(NumberFormat.getInstance());
field1.setValue(0.4);
frame.add(new JLabel("value A"));
frame.add(field1);
JFormattedTextField field2 = new JFormattedTextField(NumberFormat.getInstance());
field2.setValue(0.8);
frame.add(new JLabel("value B"));
frame.add(field2);
frame.setVisible(true);
产生:
当我单击/关注任何JFormattedTextField时,我希望它自动将插入符号放在最后
我在调用frame.setVisible(true);
之前尝试使用以下解决方案,但它们似乎都没有用
field1.setCaretPosition(field1.getDocument().getLength());
((DefaultCaret)field2.getCaret()).setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);
为我工作没有问题....
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
JTextField textField = new JTextField("This is a test");
add(textField, gbc);
JButton button = new JButton("This is a button");
add(button, gbc);
button.setFocusable(false);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (textField.getCaretPosition() != 0) {
textField.setCaretPosition(0);
} else {
textField.setCaretPosition(textField.getText().length());
}
textField.requestFocusInWindow();
}
});
}
}
}
如果您仍有问题,请提供runnable example which doesn't work
JFormattedTextField
....import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
JFormattedTextField textField = new JFormattedTextField("This is a test");
textField.setValue(0.8d);
add(textField, gbc);
JButton button = new JButton("This is a button");
add(button, gbc);
button.setFocusable(false);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (textField.getCaretPosition() != 0) {
textField.setCaretPosition(0);
} else {
textField.setCaretPosition(textField.getText().length());
}
textField.requestFocusInWindow();
}
});
}
}
}
好吧,我只想指出我个人不喜欢JFormattedTextField
,它有时会做很多“事情”并不总是有意义的。
我使用的“旧”技巧,在实现“自动选择所有焦点增益”时,将请求卸载到事件调度线程的末尾,这将请求放在JFormattedTextField
的所有“时髦的东西”之后当场地变得集中时......
JFormattedTextField textField = new JFormattedTextField("This is a test");
textField.setValue(0.8d);
add(textField, gbc);
textField.addFocusListener(new FocusAdapter() {
@Override
public void focusGained(FocusEvent arg0) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
textField.setCaretPosition(textField.getText().length());
}
});
}
});
是的,我很认真......