How to make a modal JFrame?

[surot]

hi friends,
I have 2 jFrame one is the main jFrame and the other one is the sub jFrame. What im trying to do is when i show the sub jFrame, the user cannot do anything in the main jFrame(e.g. the user cannot click any button).I think it can be done in jDialog and by using the setModal method however i want to know if this is possible in jFrame.Awaiting for your prompt reply.thanks.

[Eranga]

It should be possible as far as I know. I have done so many such things you are talking about. What properties you have set on the main frame?

[surot]

code :

/*
* mainJFrame.java
*
* Created on April 10, 2008, 3:27 PM
*/

package com.modalForm;

public class mainJFrame extends javax.swing.JFrame {

/** Creates new form mainJFrame */
public mainJFrame() {
initComponents();
}

/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

jButton1 = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstan ts.EXIT_ON_CLOSE);

jButton1.setText("show sub JFrame");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(138, 138, 138)
.addComponent(jButton1)
.addContainerGap(182, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(66, 66, 66)
.addComponent(jButton1)
.addContainerGap(273, Short.MAX_VALUE))
);

java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize ();
setBounds((screenSize.width-443)/2, (screenSize.height-396)/2, 443, 396);
}// </editor-fold>

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
subJFrame sub = new subJFrame();
sub.setVisible(true);
}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new mainJFrame().setVisible(true);
}
});
}

// Variables declaration - do not modify
private javax.swing.JButton jButton1;
// End of variables declaration

}

========
/*
* subJFrame.java
*
* Created on April 10, 2008, 3:29 PM
*/

package com.modalForm;

/**
*
* @author IT Department
*/
public class subJFrame extends javax.swing.JFrame {

/** Creates new form subJFrame */
public subJFrame() {
initComponents();
}

/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

jButton1 = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstan ts.EXIT_ON_CLOSE);

jButton1.setText("Close");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(154, 154, 154)
.addComponent(jButton1)
.addContainerGap(187, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(77, 77, 77)
.addComponent(jButton1)
.addContainerGap(200, Short.MAX_VALUE))
);

pack();
}// </editor-fold>

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
this.dispose();
}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new subJFrame().setVisible(true);
}
});
}

// Variables declaration - do not modify
private javax.swing.JButton jButton1;
// End of variables declaration

}

[Eranga]

I'm not clear what you say. I can interact with any frame at any time on your code.

[surot]

Upon clicking the "show sub Jframe" button the sub JFrame shows also in the screen right? Now, i dont want the user to interact to the main JFrame(it should be locked for interaction) until the sub JFrame has been closed...i hope i explain it clearly.thanks...

[Eranga]

Ah, I got the point. There is one tricky way to do this using JFrame. Set the location, I mean the initial display location, in to same values in both frames. And then on the sub frame, set the always on top property to true. Then try.

But in that case you have to hide the title bar, if not user can move anywhere and do the work.

Still it is not ok, because on the system tray you can both frames. You can move frames there also.

In this type of situations, used JDialog box.

[surot]

ok..I will try what you've said..Once again..thank you...

[Eranga]

Anytime, try it and see what happened. As far as I remember, there is no other way to do this, using properties of JFrames.

I'm saying, not remember

[Joe2003]

I dont think you can set the modal value on a JFrame. From past experince I think you have to use a JDialog?

cant rememeber, might be wrong

[surot]

I have solved the modal mode of JFrame by using the setEnabled method. Below is my code.

/*
* mainJFrame.java
*
* Created on April 10, 2008, 3:27 PM
*/

package com.modalForm;

public class mainJFrame extends javax.swing.JFrame {

/** Creates new form mainJFrame */
public mainJFrame() {
initComponents();
}

/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

jButton1 = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstan ts.EXIT_ON_CLOSE);

jButton1.setText("show sub JFrame");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(138, 138, 138)
.addComponent(jButton1)
.addContainerGap(182, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(66, 66, 66)
.addComponent(jButton1)
.addContainerGap(273, Short.MAX_VALUE))
);

java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize ();
setBounds((screenSize.width-443)/2, (screenSize.height-396)/2, 443, 396);
}// </editor-fold>

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
subJFrame sub = new subJFrame();
sub.setVisible(true);
this.setEnabled(false);
}

private void formWindowActivated(java.awt.event.WindowEvent evt) {
this.setEnabled(true);
}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new mainJFrame().setVisible(true);
}
});
}

// Variables declaration - do not modify
private javax.swing.JButton jButton1;
// End of variables declaration

}

========
/*
* subJFrame.java
*
* Created on April 10, 2008, 3:29 PM
*/

package com.modalForm;


public class subJFrame extends javax.swing.JFrame {

/** Creates new form subJFrame */
public subJFrame() {
initComponents();
}

/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
*/
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

jButton1 = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstan ts.EXIT_ON_CLOSE);

jButton1.setText("Close");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(154, 154, 154)
.addComponent(jButton1)
.addContainerGap(187, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout .Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(77, 77, 77)
.addComponent(jButton1)
.addContainerGap(200, Short.MAX_VALUE))
);

pack();
}// </editor-fold>

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
this.dispose();
}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new subJFrame().setVisible(true);
}
});
}

// Variables declaration - do not modify
private javax.swing.JButton jButton1;
// End of variables declaration

}


===
Now my problem is how will i set the mainJFrame as the active form after closing the subJFrame?

[Eranga]

Make back to setEnable() true, after disposing the sub frame.

By the time pal, when you put code, please use tags. It's really helpful for us.