这可能是一个非常简单的事情,我忽略了,但我似乎无法弄明白。
我有以下更新JTable的方法:
class TableModel extends AbstractTableModel {
public void updateTable() {
try {
// update table here
...
} catch (NullPointerException npe) {
isOpenDialog = true;
JOptionPane.showMessageDialog(null, "No active shares found on this IP!");
isOpenDialog = false;
}
}
}
但是,在按下消息对话框上的“确定”按钮之前,我不希望将isOpenDialog
布尔值设置为false,因为如果用户按下Enter键,它将激活KeyListener
事件。如果文本字段设置为false
,则会再次触发整个代码块。
KeyListener代码的一部分如下所示:
public class KeyReleased implements KeyListener {
...
@Override
public void keyReleased(KeyEvent ke) {
if(txtIPField.getText().matches(IPADDRESS_PATTERN)) {
validIP = true;
} else {
validIP = false;
}
if (ke.getKeyCode() == KeyEvent.VK_ENTER) {
if (validIP && !isOpenDialog) {
updateTable();
}
}
}
}
JOptionPane.showMessageDialog()
是否有某种机制阻止执行下一行,直到按下确定按钮?谢谢。
答案 0 :(得分:10)
JOptionPane创建一个模态对话框,因此在处理对话框之前不会调用超出它的行(按下其中一个按钮或按下关闭菜单按钮)。
更重要的是,你不应该为这种事情使用KeyListener。如果您想让JTextField监听按Enter键,请向其添加一个ActionListener。
答案 1 :(得分:7)
使用showConfirmDialog(...),而不是showMessageDialog()
,可以轻松解决您的需求,这样您就可以从用户那里获取输入,然后继续进行操作。请查看此示例程序,以获得澄清: - )
import javax.swing.*;
public class JOptionExample
{
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
int selection = JOptionPane.showConfirmDialog(
null
, "No active shares found on this IP!"
, "Selection : "
, JOptionPane.OK_CANCEL_OPTION
, JOptionPane.INFORMATION_MESSAGE);
System.out.println("I be written" +
" after you close, the JOptionPane");
if (selection == JOptionPane.OK_OPTION)
{
// Code to use when OK is PRESSED.
System.out.println("Selected Option is OK : " + selection);
}
else if (selection == JOptionPane.CANCEL_OPTION)
{
// Code to use when CANCEL is PRESSED.
System.out.println("Selected Option Is CANCEL : " + selection);
}
}
});
}
}
答案 2 :(得分:1)
You can get acces to the OK button if you create optionpanel and custom dialog. Here's an example of this kind of implementation:
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author OZBORN
*/
public class TestyDialog {
static JFrame okno;
static JPanel panel;
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
zrobOkno();
JButton przycisk =new JButton("Dialog");
przycisk.setSize(200,200);
panel.add(przycisk,BorderLayout.CENTER);
panel.setCursor(null);
BufferedImage cursorImg = new BufferedImage(16, 16, BufferedImage.TYPE_INT_ARGB);
przycisk.setCursor(Toolkit.getDefaultToolkit().createCustomCursor(
cursorImg, new Point(0, 0), "blank cursor"));
final JOptionPane optionPane = new JOptionPane(
"U can close this dialog\n"
+ "by pressing ok button, close frame button or by clicking outside of the dialog box.\n"
+"Every time there will be action defined in the windowLostFocus function"
+ "Do you understand?",
JOptionPane.INFORMATION_MESSAGE,
JOptionPane.DEFAULT_OPTION);
System.out.println(optionPane.getComponentCount());
przycisk.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
final JFrame aa=new JFrame();
final JDialog dialog = new JDialog(aa,"Click a button",false);
((JButton)((JPanel)optionPane.getComponents()[1]).getComponent(0)).addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
aa.dispose();
}
});
dialog.setContentPane(optionPane);
dialog.pack();
dialog.addWindowFocusListener(new WindowFocusListener() {
@Override
public void windowLostFocus(WindowEvent e) {
System.out.println("Zamykam");
aa.dispose();
}
@Override public void windowGainedFocus(WindowEvent e) {}
});
dialog.setVisible(true);
}
});
}
public static void zrobOkno(){
okno=new JFrame("Testy okno");
okno.setLocationRelativeTo(null);
okno.setSize(200,200);
okno.setPreferredSize(new Dimension(200,200));
okno.setVisible(true);
okno.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel=new JPanel();
panel.setPreferredSize(new Dimension(200,200));
panel.setLayout(new BorderLayout());
okno.add(panel);
}
}
答案 3 :(得分:-3)
试试这个,
catch(NullPointerException ex){
Thread t = new Thread(new Runnable(){
public void run(){
isOpenDialog = true;
JOptionPane.setMessageDialog(Title,Content);
}
});
t.start();
t.join(); // Join will make the thread wait for t to finish its run method, before
executing the below lines
isOpenDialog = false;
}