我正在使用 GridBagLayout 创建一个简单的 GUI，几乎一切正常，但有这样一个细节：有两列，左侧用于标签，右侧用于 JTextArea 等其他小部件，我希望第一列与右侧对齐.
所以我尝试将锚属性设置为 GridBagConstraints.NORTHEAST 或 .EAST，但它们都不起作用。
我的代码如下：
private void createDataPanel() {
data = new JPanel();
data.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
data.setBorder(new TitledBorder("NOTAM proposal parameters"));
c.gridx = 0;
c.gridy = 0;
c.insets = new Insets(5, 10, 5, 10);
c.fill = GridBagConstraints.HORIZONTAL;
data.add(new JLabel("Start time (DD-MM-YYYY HH:MM:SS):"), c);
c.gridx++;
long today = System.currentTimeMillis();
startTimePicker = new JXDatePicker(new Date(today));
startTimePicker.setFormats(dateFormatter);
data.add(startTimePicker);
c.gridx = 0;
c.gridy++;
c.anchor = GridBagConstraints.EAST;
data.add(new JLabel("End time (DD-MM-YYYY HH:MM:SS):"), c);
c.gridx++;
c.anchor = GridBagConstraints.CENTER;
long tomorrow = today + 86400000;
endTimePicker = new JXDatePicker(new Date(tomorrow));
endTimePicker.setFormats(dateFormatter);
data.add(endTimePicker, c);
c.gridx = 0;
c.gridy++;
c.anchor = GridBagConstraints.NORTHEAST;
JPanel itemEPanel = new JPanel();
itemEPanel.setLayout(new BoxLayout(itemEPanel, BoxLayout.Y_AXIS));
itemEPanel.add(new JLabel("Item E:"));
remainingChars = new JLabel(Integer.toString(availableChars) + " characters remaining");
itemEPanel.add(remainingChars);
data.add(itemEPanel, c);
c.gridx++;
c.anchor = GridBagConstraints.CENTER;
itemEText = new JTextArea(8, 1);
JScrollPane itemEScroll = new JScrollPane(itemEText);
itemEText.setLineWrap(true);
itemEText.setWrapStyleWord(true);
itemEText.setBackground(Color.WHITE);
itemEText.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void removeUpdate(DocumentEvent e) {
updateRemainingChars(e.getDocument());
}
@Override
public void insertUpdate(DocumentEvent e) {
updateRemainingChars(e.getDocument());
}
@Override
public void changedUpdate(DocumentEvent e) {
updateRemainingChars(e.getDocument());
}
public void updateRemainingChars(Document doc) {
availableChars = maxItemECharacters - doc.getLength();
if(availableChars>=0){
remainingChars.setText(Integer.toString(availableChars) + " characters remaining");
remainingChars.setForeground(Color.BLACK);
if(!okButton.isEnabled()) okButton.setEnabled(true);
}
else{
remainingChars.setText("Message too long: " + Integer.toString(availableChars));
remainingChars.setForeground(Color.RED);
if(okButton.isEnabled()) okButton.setEnabled(false);
}
}
});
data.add(itemEScroll, c);
c.gridx = 0;
c.gridy++;
JPanel itemDPanel = new JPanel(new FlowLayout());
applicable = new JCheckBox("Applicable");
applicable.setSelected(true);
applicable.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
itemDText.setEnabled(applicable.isSelected());
}
});
itemDPanel.add(applicable);
itemDPanel.add(new JLabel("Item D:"));
data.add(itemDPanel, c);
c.gridx++;
itemDText = new JTextField();
data.add(itemDText, c);
}
尽管如此，它目前看起来像这样：
那它怎么能对齐呢？