Is there a way to set a dialog location relative to a JFrame
?
I would like to center the dialog to the frame that houses my GUI, instead the dialog often appears in the center of the screen rather than within the GUI.
Is there a way to set a location relative to another JFrame
You can:
JFrame
as argument for JDialog.setLocationRelativeTo(Component c)Point
from JFrame
to JDialog.setLocation(Point p)EDIT
all Swing code must be done on EventDispatchThread, meaning that setVisible(true)
should be wrapped into invokeLater
EDIT2
when using the JFrame as Component c I am getting a cannot find symbol error
not possible, some small mistake
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class ClosingFrameDialog extends JFrame {
private JFrame frame = new JFrame();
private static final long serialVersionUID = 1L;
private JMenuBar MenuBar;
private JMenu File;
private JMenuItem Exit;
private JMenuItem ShowDialog;
private JDialog dialog;
private Point location;
public ClosingFrameDialog() {
Exit = new JMenuItem(" Exit ");
Exit.addActionListener(new ExitListener());
ShowDialog = new JMenuItem(" Show Dialog ");
ShowDialog.addActionListener(showingDialog());
File = new JMenu(" File ");
File.add(Exit);
File.add(ShowDialog);
MenuBar = new JMenuBar();
MenuBar.add(File);
frame.addWindowListener(exitListener);
frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
frame.setJMenuBar(MenuBar);
frame.setPreferredSize(new Dimension(400, 300));
frame.setLocation(100, 100);
frame.pack();
frame.setVisible(true);
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
createDialog();
}
});
}
private void createDialog() {
JButton btn = new JButton(" Save changes ");
btn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//some stuff for saving whatewer programatically
dialog.setVisible(false);
}
});
JButton btn1 = new JButton(" Ignore changes ");
btn1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
dialog.setLocationRelativeTo(frame);
dialog.setVisible(false);
}
});
dialog = new JDialog();
dialog.add(btn);
dialog.add(btn1);
dialog.setVisible(false);
dialog.setAlwaysOnTop(true);
dialog.setModal(true);
dialog.setLayout(new GridLayout(2, 0, 10, 10));
JPanel pane = (JPanel) dialog.getContentPane();
pane.setBorder(new EmptyBorder(10, 10, 10, 10));
dialog.addWindowListener(closeListener);
dialog.pack();
}
//
private WindowListener exitListener = new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
int confirm = JOptionPane.showOptionDialog(frame,
"Are You Sure to Close this Application?",
"Exit Confirmation", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, null, null);
if (confirm == 0) {
System.exit(1);
}
}
@Override
public void windowIconified(WindowEvent e) {
int confirm = JOptionPane.showOptionDialog(frame,
"Are You Sure to Close this Application?",
"Exit Confirmation", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, null, null);
if (confirm == 0) {
//System.exit(1);
}
}
};
//
private WindowListener closeListener = new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
int confirm = JOptionPane.showOptionDialog(dialog,
"Are you want to save changes",
"Exit Confirmation", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, null, null);
if (confirm == 0) {
//some stuff for saving whatewer programatically
dialog.setVisible(true);
} else if (confirm == 1) {// nothing only hide JDialog
dialog.setVisible(true);
}
}
};
private Action showingDialog() {
return new AbstractAction("Show Dialog") {
private static final long serialVersionUID = 1L;
@Override
public void actionPerformed(ActionEvent e) {
Runnable doRun = new Runnable() {
@Override
public void run() {
dialog.setVisible(false);
location = frame.getLocationOnScreen();
int x = location.x;
int y = location.y;
//dialog.setLocation(x, y);
dialog.setLocationRelativeTo(frame);
dialog.setVisible(true);
}
};
SwingUtilities.invokeLater(doRun);
}
};
}
private class ExitListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
int confirm = JOptionPane.showOptionDialog(frame,
"Are You Sure to Close this Application?",
"Exit Confirmation", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, null, null);
if (confirm == 0) {
System.exit(1);
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
ClosingFrameDialog cf = new ClosingFrameDialog();
}
});
}
}