大约一周前,我开始研究选项类型的GUI.我从一个JFrame开始,并添加了相当多的功能与各种按钮和键监听器.我有这一切工作,并决定我希望窗口是模态的.我将JFrame转换为JDialog,虽然它仍然是非模态的,但所有功能仍然存在但是当我将其设置为模态(true或false)时,我失去了所有听众的功能.什么是错的？
我正在努力将我的SVN上传到GitHub.如果你需要查看代码只是评论这样说并给我几分钟.提前致谢.
package main;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import javax.swing.*;
import Twitter.SearchTweets;
public class OptionsGUI {
// auto generated
private static final long serialVersionUID = 1L;
private JDialog f;
private JPanel buttonPanel;
private JPanel optionsLabelPanel;
private JPanel optionsSetPanel;
private JLabel sortLocationLabel;
private JLabel timeoutLabel;
private JLabel maxTweetsLabel;
private JLabel keywordsLabel;
private JLabel currentKeywordsLabel;
private JButton add;
private JButton remove;
private JButton save;
private JButton cancel;
private JCheckBox sortLocationField;
private JTextField setTimeoutField;
private JTextField setMaxTweetsField;
private JTextField addKeywordField;
private JComboBox currentKeywordsField;
public OptionsGUI() {
f = new JDialog(f, "Options");
buttonPanel = new JPanel();
optionsLabelPanel = new JPanel();
optionsSetPanel = new JPanel();
sortLocationLabel = new JLabel("Sort by location: ");
sortLocationLabel.setHorizontalAlignment(JLabel.RIGHT);
timeoutLabel = new JLabel("Timeout (in seconds): ");
timeoutLabel.setHorizontalAlignment(JLabel.RIGHT);
maxTweetsLabel = new JLabel("Maximum Tweets to show: ");
maxTweetsLabel.setHorizontalAlignment(JLabel.RIGHT);
keywordsLabel = new JLabel("Keyword to add: ");
keywordsLabel.setHorizontalAlignment(JLabel.RIGHT);
currentKeywordsLabel = new JLabel("Current keywords: ");
currentKeywordsLabel.setHorizontalAlignment(JLabel.RIGHT);
add = new JButton("Add Keyword");
remove = new JButton("Remove Keyword");
save = new JButton("Save");
cancel = new JButton("Cancel");
sortLocationField = new JCheckBox();
setTimeoutField = new JTextField(10);
setMaxTweetsField = new JTextField(10);
addKeywordField = new JTextField(10);
currentKeywordsField = new JComboBox();
currentKeywordsField.setEditable(false);
buttonPanel.setLayout(new GridLayout(2,2));
buttonPanel.add(add);
buttonPanel.add(remove);
buttonPanel.add(save);
buttonPanel.add(cancel);
optionsLabelPanel.setLayout(new GridLayout(5,1));
optionsLabelPanel.add(sortLocationLabel);
optionsLabelPanel.add(timeoutLabel);
optionsLabelPanel.add(maxTweetsLabel);
optionsLabelPanel.add(keywordsLabel);
optionsLabelPanel.add(currentKeywordsLabel);
optionsSetPanel.setLayout(new GridLayout(5,1));
optionsSetPanel.add(sortLocationField);
optionsSetPanel.add(setTimeoutField);
optionsSetPanel.add(setMaxTweetsField);
optionsSetPanel.add(addKeywordField);
optionsSetPanel.add(currentKeywordsField);
sortLocationField.setSelected(BasicGUI.isSortedByLocation());
setTimeoutField.setText("" + SearchTweets.getTimeout());
setMaxTweetsField.setText("" + BasicGUI.getMaxTweets());
if (SearchTweets.getKeywords().size() > 0) {
for (String keyword: SearchTweets.getKeywords()) {
currentKeywordsField.addItem(keyword);
}
}
else
currentKeywordsField.addItem("(none)");
f.getContentPane().setLayout(new BorderLayout());
f.getContentPane().add(buttonPanel, BorderLayout.SOUTH);
f.getContentPane().add(optionsLabelPanel, BorderLayout.WEST);
f.getContentPane().add(optionsSetPanel, BorderLayout.CENTER);
f.setBounds(50, 50, 300, 235);
f.setResizable(false);
f.setAlwaysOnTop(true);
f.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
f.setVisible(true);
addKeywordField.requestFocus();
add.addActionListener(new ButtonListener());
addKeywordField.addKeyListener(new KeyChecker());
remove.addActionListener(new ButtonListener());
save.addActionListener(new ButtonListener());
cancel.addActionListener(new ButtonListener());
}
public class ButtonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
if (e.getSource() == add) {
String newKeyword = addKeywordField.getText();
if (newKeyword != null && newKeyword.length() > 0) {
boolean duplicate = false;
ArrayList<String> keywords = SearchTweets.getKeywords();
for (int i = 0; i < keywords.size(); i++) {
if (keywords.get(i).equalsIgnoreCase(newKeyword)) {
duplicate = true;
break;
}
}
addKeywordField.transferFocus();
if (duplicate == false) {
if (keywords.size() == 0)
currentKeywordsField.removeItem("(none)");
currentKeywordsField.addItem(addKeywordField.getText());
currentKeywordsField.setSelectedItem(addKeywordField.getText());
}
else {
JOptionPane.showMessageDialog(null, "Please enter a keyword that is not already in the list.", "Duplicate Keyword", JOptionPane.ERROR_MESSAGE);
f.toFront();
addKeywordField.requestFocus();
addKeywordField.setText("");
}
}
else {
JOptionPane.showMessageDialog(null, "Please enter a keyword before clicking \"Add\".", "Empty Field", JOptionPane.ERROR_MESSAGE);
f.toFront();
addKeywordField.requestFocus();
}
f.toFront();
addKeywordField.requestFocus();
addKeywordField.setText("");
}
else if (e.getSource() == remove) {
if (currentKeywordsField.getSelectedItem() != null) {
if (!(((String)currentKeywordsField.getSelectedItem()).equals("(none)"))) {
currentKeywordsField.removeItem(currentKeywordsField.getSelectedItem());
if (currentKeywordsField.getItemCount() == 0) {
currentKeywordsField.addItem("(none)");
}
}
else
JOptionPane.showMessageDialog(null, "No keywords have been entered yet.", "Empty List", JOptionPane.ERROR_MESSAGE);
f.toFront();
}
}
else if (e.getSource() == save) {
boolean inputFail = false;
//input checking try block
try {
int tempTimeout = Integer.parseInt(setTimeoutField.getText());
if (tempTimeout < 0)
throw new Exception();
int tempMaxTweets = Integer.parseInt(setMaxTweetsField.getText());
if (tempMaxTweets < 0)
throw new Exception();
BasicGUI.setSortedByLocation(sortLocationField.isSelected());
SearchTweets.setTimeout(tempTimeout);
BasicGUI.setMaxTweets(tempMaxTweets);
} catch (NumberFormatException error) {
inputFail = true;
JOptionPane.showMessageDialog(null, "Please insure that Timeout and Maximum\nTweets are both integers.", "Invalid Input", JOptionPane.ERROR_MESSAGE);
f.toFront();
} catch (Exception error) {
inputFail = true;
JOptionPane.showMessageDialog(null, "Please be sure to enter a nonzero\ninteger for Timeout and Maximum Tweets.\n0 for either insures no timeout or a\nmaximum amount of tweets shown.", "Invalid Input", JOptionPane.ERROR_MESSAGE);
if (Integer.parseInt(setTimeoutField.getText()) < 0)
setTimeoutField.setText("" + SearchTweets.getTimeout());
if ( Integer.parseInt(setMaxTweetsField.getText()) < 0)
setMaxTweetsField.setText("" + BasicGUI.getMaxTweets());
f.toFront();
}
if (inputFail == false) {
SearchTweets.deleteKeywords();
for (int i = 0; i < currentKeywordsField.getItemCount(); i++) {
SearchTweets.addKeyword((String)currentKeywordsField.getItemAt(i));
}
BasicGUI.setOptionsOpen(false);
f.dispose();
}
BasicGUI.setSettingsPaneValues();
}
else if (e.getSource() == cancel) {
BasicGUI.setOptionsOpen(false);
f.dispose();
}
else {
JOptionPane.showMessageDialog(null, "Error: Button not recognized");
}
}
}
public class KeyChecker implements KeyListener {
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_ENTER) {
add.doClick();
}
}
public void keyReleased(KeyEvent arg0) {
//ignore
}
public void keyTyped(KeyEvent arg0) {
//ignore
}
}
public class ListenCloseWdw extends WindowAdapter{
public void windowClosing(WindowEvent e){
BasicGUI.setOptionsOpen(false);
f.dispose();
}
}
}
解决方法:
不要使用KeyListener.将ActionListener添加到文本字段,如下所示. Enter键已绑定到接受输入文本的Action.
另见How to Use Actions和How to Use Key Bindings.
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
/** @see https://*.com/a/11085850/230513 */
public class EnterTest extends JPanel {
public EnterTest() {
super(new GridLayout(0, 1));
final JButton add = new JButton(new AbstractAction("Add") {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("Add");
}
});
JTextField addKeywordField = new JTextField("Press enter.");
addKeywordField.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
add.doClick();
}
});
this.add(addKeywordField);
this.add(add);
}
private void display() {
JFrame f = new JFrame("EnterTest");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new EnterTest().display();
}
});
}
}