1) 如何在不使用插入符或焦点包裹到 invokeLater() 的情况下将 Cursor 设置为 0 位置(可以通过使用@camickr Formatted Text Field Tips 轻松解决),有人知道另一种方法吗
2) How to reset Formatter
有时(通过键盘上的 TAB 提升焦点),重置不起作用并且在 focusLost(空字段)Formatter 返回/重新生成的字符或字符串返回(最后知道在 setText(""); 之前,
Note: know code or following code is only this way
,关于如何从 OTN 重置 Formatter,但是他们可怕的搜索规则....,只有代码(Jeanette 的问题或答案?? ?)
import java.awt.event.*;
import java.beans.*;
import java.text.ParseException;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.Document;
public class FormattedNull {
private JFormattedTextField field;
private JButton focusButton;
private JComponent createContent() {
JComponent content = new JPanel();
field = new JFormattedTextField(new Integer(55));
field.setColumns(20);
field.addPropertyChangeListener(getPropertyChangeListener());
field.getDocument().addDocumentListener(getDocumentListener());
content.add(field);
focusButton = new JButton("just something focusable");
focusButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
field.setValue(0);
field.requestFocusInWindow();
}
});
content.add(focusButton);
return content;
}
protected void maybeCommitEdit(Document document) {
try {
field.commitEdit();
} catch (ParseException e) {
// uncomment to map empty string to null
if (field.getText().length() == 0) {
field.setValue(null);
}
}
}
/*public void commitEdit() throws ParseException {
if(allowsNull() && isBlank()) {
setValue(null);
}
else {
super.commitEdit();
}
}*/
private PropertyChangeListener getPropertyChangeListener() {
PropertyChangeListener propertyChangeListener = new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if ("value".equals(evt.getPropertyName())) {
matchValueChanged(evt.getNewValue());
}
}
};
return propertyChangeListener;
}
protected void matchValueChanged(Object value) {
System.out.println("got new value: " + value);
}
private DocumentListener getDocumentListener() {
DocumentListener documentListener = new DocumentListener() {
@Override
public void removeUpdate(DocumentEvent e) {
maybeCommitEdit(e.getDocument());
}
@Override
public void insertUpdate(DocumentEvent e) {
maybeCommitEdit(e.getDocument());
}
@Override
public void changedUpdate(DocumentEvent e) {
}
};
return documentListener;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame("");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new FormattedNull().createContent());
frame.setLocationRelativeTo(null);
frame.pack();
frame.setVisible(true);
}
});
}
}
附件图片基于我的sscce
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import javax.swing.*;
import javax.swing.text.MaskFormatter;
public class TestTest {
private JFormattedTextField myFormattedField1 = new JFormattedTextField(createFormatter("AAAAAAAAAAAA"));
private JFormattedTextField myFormattedField2 = new JFormattedTextField(createFormatter("AAAAAAAAAAAA"));
private JFormattedTextField myFormattedField3 = new JFormattedTextField(createFormatter("AAAAAAAAAAAA"));
private JFormattedTextField myFormattedField4 = new JFormattedTextField(createFormatter("AAAAAAAAAAAA"));
private JButton jb = new JButton("Reset to Default");
private JFrame frame = new JFrame("Text Test");
public TestTest() {
myFormattedField1.setText("ABCDEFGHIJKL");
myFormattedField2.setText("ABCDEFGHIJKL");
myFormattedField3.setText("ABCDEFGHIJKL");
myFormattedField4.setText("ABCDEFGHIJKL");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocation(150, 150);
frame.setLayout(new GridLayout(5, 0));
frame.add(jb);
frame.add(myFormattedField1);
frame.add(myFormattedField2);
frame.add(myFormattedField3);
frame.add(myFormattedField4);
jb.addActionListener(new java.awt.event.ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
myFormattedField1.setText("");
myFormattedField2.setText("");
myFormattedField3.setText("");
myFormattedField4.setText("");
}
});
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
TestTest textTest = new TestTest();
}
protected MaskFormatter createFormatter(String s) {
MaskFormatter formatter = null;
try {
formatter = new MaskFormatter(s);
} catch (java.text.ParseException exc) {
System.err.println("formatter is bad: " + exc.getMessage());
}
return formatter;
}
}
最佳答案
在 Mac OS 上,UI 委托(delegate)的默认行为
com.apple.laf.AquaTextFieldF
类似于CaretPositionListener
:Tab 或 Shift-Tab:将插入符放在字段的开头。
单击:将插入符号短暂放置在字段的开头,然后将其移动到单击点。
IMO,
CaretPositionListener
可以更顺利地完成后者。JFormattedTextField
失去焦点时的默认行为是COMMIT_OR_REVERT
。在下面的示例中,Tab 通过第一个无效字段来查看效果。格式化程序既不能提交也不能还原为无效值,因此它替换了MASK.length()
空格。这个值是有效的,尽管有点模糊。
附录:我更新了下面的代码以允许更改 setFocusLostBehavior()
。
代码:
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.text.MaskFormatter;
/** @see http://stackoverflow.com/questions/7378821 */
public class TrashTest {
private static final String MASK = "########";
private static final String DEFAULT = "01234567";
private static final String BOGUS = "0123456";
private JFormattedTextField jtf1 = createField();
private JFormattedTextField jtf2 = createField();
private JFormattedTextField jtf3 = createField();
private JFormattedTextField jtf4 = createField();
private JButton reset = new JButton("Reset to Default");
private JComboBox combo = new JComboBox();
private JFrame frame = new JFrame("Text Test");
public TrashTest() {
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocation(150, 150);
frame.setLayout(new GridLayout(0, 1));
frame.add(reset);
frame.add(jtf1);
frame.add(jtf2);
frame.add(jtf3);
frame.add(jtf4);
frame.add(combo);
this.initFields();
reset.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
initFields();
}
});
for (Edit e : Edit.values()) {
combo.addItem(e);
}
combo.setSelectedIndex(jtf1.getFocusLostBehavior());
combo.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Edit current = (Edit) combo.getSelectedItem();
jtf1.setFocusLostBehavior(current.value);
}
});
frame.pack();
frame.setVisible(true);
}
private void initFields() {
jtf1.setText(BOGUS);
jtf2.setText(DEFAULT);
jtf3.setText(DEFAULT);
jtf4.setText(DEFAULT);
}
protected JFormattedTextField createField() {
MaskFormatter formatter = null;
try {
formatter = new MaskFormatter(MASK);
} catch (java.text.ParseException e) {
e.printStackTrace(System.out);
}
JFormattedTextField jtf = new JFormattedTextField(formatter);
return jtf;
}
enum Edit {
COMMIT(JFormattedTextField.COMMIT),
COMMIT_OR_REVERT(JFormattedTextField.COMMIT_OR_REVERT),
REVERT(JFormattedTextField.REVERT),
PERSIST(JFormattedTextField.PERSIST);
private int value;
private Edit(int n) {
this.value = n;
}
public static Edit getEnum(int n) {
for (Edit e : Edit.values()) {
if (e.value == n) {
return e;
}
}
return Edit.COMMIT_OR_REVERT;
}
}
public static void main(String[] args) {
TrashTest textTest = new TrashTest();
}
}
关于java - JFormattedTextField 问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7378821/