问题
i have a situation where i show a dialog where user has to fill some menus and then press OK. It works fine, but now i have another button on this dialog that if user wants to add some certain value, i want another dialog to popup where user fills the additional value and while pressing ok, this dialog disappears and user comes back to the main dialog.
I have tried this, but every time i call the new dialog, the focus does not go away from the main dialog, how can i do such a task.
Is there any relevant example or what is the proper way of doing such things.
EDIT:
public static class EdgeMenu extends JPopupMenu {
// private JFrame frame;
public MyMenu(final JFrame frame) {
super("My Menu");
// this.frame = frame;
this.addSeparator();
this.add(new EdgePropItem(frame));
}
}
//this shows the first dialog, another class because i have some other
//functions to be performed here
public static class EdgePropItem extends JMenuItem{
//...
public EdgePropItem(final JFrame frame) {
super("Edit Properties");
this.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
EdgePropertyDialog dialog = new EdgePropertyDialog(frame, edge);
dialog.setVisible(true);
}
});
}
}
and now in other dialog, in the button even listener i am trying to call another dialog:
private void newDialogHandler(java.awt.event.ActionEvent evt) {
MyNewDialog rdialog = new MyNewDialog(edge);
rdialog.setVisible(true);
}
It appears fine, but the previous dialog, does not leave the focus, and it goes away only if i press finish/done on that dialog, what i want is the new dialog to come in focus, while pressing ok on here, focus should come back to the old main dialog, but it is not working?
回答1:
maybe this code could be demonstate your issues,
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SuperConstructor extends JFrame {
private static final long serialVersionUID = 1L;
public SuperConstructor() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setPreferredSize(new Dimension(300, 300));
setTitle("Super constructor");
Container cp = getContentPane();
JButton b = new JButton("Show dialog");
b.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
FirstDialog firstDialog = new FirstDialog(SuperConstructor.this);
}
});
cp.add(b, BorderLayout.SOUTH);
JButton bClose = new JButton("Close");
bClose.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
System.exit(0);
}
});
add(bClose, BorderLayout.NORTH);
pack();
setVisible(true);
}
public static void main(String args[]) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
SuperConstructor superConstructor = new SuperConstructor();
}
});
}
private class FirstDialog extends JDialog {
private static final long serialVersionUID = 1L;
FirstDialog(final Frame parent) {
super(parent, "FirstDialog");
setPreferredSize(new Dimension(200, 200));
setLocationRelativeTo(parent);
setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
setModalityType(Dialog.ModalityType.DOCUMENT_MODAL);
JButton bNext = new JButton("Show next dialog");
bNext.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
SecondDialog secondDialog = new SecondDialog(parent, false);
}
});
add(bNext, BorderLayout.NORTH);
JButton bClose = new JButton("Close");
bClose.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
setVisible(false);
}
});
add(bClose, BorderLayout.SOUTH);
pack();
setVisible(true);
}
}
private int i;
private class SecondDialog extends JDialog {
private static final long serialVersionUID = 1L;
SecondDialog(final Frame parent, boolean modal) {
//super(parent); // < --- Makes this dialog
//unfocusable as long as FirstDialog is visible
setPreferredSize(new Dimension(200, 200));
setLocation(300, 50);
setModal(modal);
setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
setTitle("SecondDialog " + (i++));
JButton bClose = new JButton("Close");
bClose.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
setVisible(false);
}
});
add(bClose, BorderLayout.SOUTH);
pack();
setVisible(true);
}
}
}
回答2:
You can achieve this as follows:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JOptionPane;
public class MultipleDialogs
{
public MultipleDialogs()
{
JButton btnOpen = new JButton("Open another dialog!");
btnOpen.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
JOptionPane.showMessageDialog(null, "This is the second dialog!");
}
});
Object[] options = {"OK", "Cancel", btnOpen};
int selectedOption = JOptionPane.showOptionDialog(null,
"This is the first dialog!", "The title",
JOptionPane.NO_OPTION, JOptionPane.PLAIN_MESSAGE,
null, options, options[0]);
if(selectedOption == 0) // Clicking "OK"
{
}
else if(selectedOption == 1) // Clicking "Cancel"
{
}
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
new MultipleDialogs();
});
}
}
}
You can replace "This is the first dialog!" and "This is the second dialog!" with JPanel's which can contain any swing components you want.
回答3:
Create the second dialog from a constructor that takes dialog and boolean as parameters and that solves the problem.
来源：https://stackoverflow.com/questions/8976874/show-two-dialogs-on-top-of-each-other-using-java-swing