不要将窗口显示为JFrame,而是将其显示为模态对话框。在它不再可见后,主GUI可以查询该对象以获取任何信息。最简单的方法是使用JOptionPane——如果使用正确,它们是聪明的小家伙。
这里有一个我所说的例子。JOptionPane包含JPane,使用GridBagLayout显示信息。
ComplexOptionPane.java: 显示主JFrame。
import java.awt.event.*;
import javax.swing.*;
@SuppressWarnings("serial")
public class ComplexOptionPane extends JPanel {
private PlayerEditorPanel playerEditorPanel = new PlayerEditorPanel();
private JTextArea textArea = new JTextArea(20, 40);
public ComplexOptionPane() {
add(new JScrollPane(textArea));
add(new JButton(new AbstractAction("Get Player Information") {
@Override
public void actionPerformed(ActionEvent arg0) {
int result = JOptionPane.showConfirmDialog(null, playerEditorPanel,
"Edit Player", JOptionPane.OK_CANCEL_OPTION,
JOptionPane.PLAIN_MESSAGE);
if (result == JOptionPane.OK_OPTION) {
for (PlayerEditorPanel.FieldTitle fieldTitle :
PlayerEditorPanel.FieldTitle.values()) {
textArea.append(String.format("%10s: %s%n", fieldTitle.getTitle(),
playerEditorPanel.getFieldText(fieldTitle)));
}
}
}
}));
}
private static void createAndShowGui() {
ComplexOptionPane mainPanel = new ComplexOptionPane();
JFrame frame = new JFrame("ComplexOptionPane");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
PlayerEditorPanel.java持有一个JPanel,在JOptionPane中显示。
import java.awt.*;
import java.util.HashMap;
import java.util.Map;
import javax.swing.*;
@SuppressWarnings("serial")
class PlayerEditorPanel extends JPanel {
enum FieldTitle {
NAME("Name"), SPEED("Speed"), STRENGTH("Strength");
private String title;
private FieldTitle(String title) {
this.title = title;
}
public String getTitle() {
return title;
}
};
private static final Insets WEST_INSETS = new Insets(5, 0, 5, 5);
private static final Insets EAST_INSETS = new Insets(5, 5, 5, 0);
private Map<FieldTitle, JTextField> fieldMap = new HashMap<FieldTitle, JTextField>();
public PlayerEditorPanel() {
setLayout(new GridBagLayout());
setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createTitledBorder("Player Editor"),
BorderFactory.createEmptyBorder(5, 5, 5, 5)));
GridBagConstraints gbc;
for (int i = 0; i < FieldTitle.values().length; i++) {
FieldTitle fieldTitle = FieldTitle.values()[i];
gbc = createGbc(0, i);
add(new JLabel(fieldTitle.getTitle() + ":", JLabel.LEFT), gbc);
gbc = createGbc(1, i);
JTextField textField = new JTextField(10);
add(textField, gbc);
fieldMap.put(fieldTitle, textField);
}
}
private GridBagConstraints createGbc(int x, int y) {
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = x;
gbc.gridy = y;
gbc.gridwidth = 1;
gbc.gridheight = 1;
gbc.anchor = (x == 0) ? GridBagConstraints.WEST : GridBagConstraints.EAST;
gbc.fill = (x == 0) ? GridBagConstraints.BOTH
: GridBagConstraints.HORIZONTAL;
gbc.insets = (x == 0) ? WEST_INSETS : EAST_INSETS;
gbc.weightx = (x == 0) ? 0.1 : 1.0;
gbc.weighty = 1.0;
return gbc;
}
public String getFieldText(FieldTitle fieldTitle) {
return fieldMap.get(fieldTitle).getText();
}
}