Panel inside dialog box

[Seema Sharma]

Hi,
I am trying to place panel having button inside a dialog box. But the following code does execute. Let me know where did i go wrong.

   
 
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Toolkit;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
 
public class CountDownDialog {

private JFrame parentFrame;
private JDialog dialog;

protected void init() {
this.dialog = new JDialog(this.parentFrame, "Copie", true);
this.dialog.setResizable(false);
this.dialog.getContentPane().add(createPane());
this.dialog.pack();
this.dialog.setSize(450, 250);
Dimension Size = Toolkit.getDefaultToolkit().getScreenSize();
this.dialog.setLocation(new Double((Size.getWidth()/2) - (dialog.getWidth()/2)).intValue(), new Double((Size.getHeight()/2) - (dialog.getHeight()/2)).intValue());
}
 
protected Container createPane() {
JPanel mainPanel = new JPanel();
mainPanel.setBackground(new Color (0,51,153));
JButton b1 = new JButton("Hello");
mainPanel.add(b1);
return mainPanel;

}
 
public void show() {
if (this.dialog == null) {
init();
}
this.dialog.setVisible(true);
}
 
protected void close() {
this.dialog.dispose();
this.dialog.setVisible(false);
}

public void setFrame(JFrame frame){
parentFrame = (JFrame)frame;
}

public static void main(String args[]){
CountDownDialog obj = new CountDownDialog();
obj.init();

}
}
 

Thanks in advance.

[Michael Dunn]

perhaps you need to call
show();
at the end of init()

[Seema Sharma]

Thanks Michael.

Its working. Now i am trying to setLayout as "null" for dialog box which is a parent frame and place few components on it. What i see is dialog box is empty and no components are seen. When i comment line (1) and line (2) as shown in code, it works fine but without layout. Please let me know how can i set layout.

   
 
package ProgressBar;
 
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
 
public class CountDownDialog {

private JFrame parentFrame;
private JDialog dialog;

ProgressBarDemo_longTask pBar;

JPanel mainPanel;
JPanel panelLab;

JLabel infoLab;
JPanel panelBar;

JPanel panelAbortB;
JButton b1;

protected void init() {

this.dialog = new JDialog(this.parentFrame, "Copie", true);
this.dialog.setResizable(false);

this.dialog.getContentPane().add(createPane());

setEscapeKeyMap();
this.dialog.pack();
this.dialog.setSize(380, 130);
Dimension Size = Toolkit.getDefaultToolkit().getScreenSize();
this.dialog.setLocation(new Double((Size.getWidth()/2) - (dialog.getWidth()/2)).intValue(), new Double((Size.getHeight()/2) - (dialog.getHeight()/2)).intValue());
}
 
protected Container createPane() {
this.dialog.getContentPane().setLayout(null);  // (1)
mainPanel = new JPanel();
this.dialog.getContentPane().add(mainPanel);  // (2)


infoLab = new JLabel("Operation in progress.");

pBar = new ProgressBarDemo_longTask();

b1 = new JButton("Abort");

b1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {

pBar.timer.stop();
dialog.dispose();
close();
}
});

b1.addKeyListener(new KeyAdapter(){
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_ENTER){
pBar.timer.stop();
dialog.dispose();
close();
}
}
});

mainPanel.add(infoLab);
mainPanel.add(pBar);
mainPanel.add(b1);

return mainPanel;

}
 
/**
 * This method sets the Esc key even on the dialog.
 *
 */
private void setEscapeKeyMap(){

String CANCEL_ACTION_KEY = "CANCEL_ACTION_KEY";
int noModifiers = 0;
KeyStroke escapeKey = KeyStroke.getKeyStroke(
KeyEvent.VK_ESCAPE, noModifiers, false);
InputMap inputMap = this.dialog.getRootPane().getInputMap(
JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
inputMap.put(escapeKey, CANCEL_ACTION_KEY);
AbstractAction cancelAction = new AbstractAction(){
public void actionPerformed(ActionEvent e){
close();
}
};
this.dialog.getRootPane().getActionMap().put(
CANCEL_ACTION_KEY, cancelAction);
}
 

public void show() {
if (this.dialog == null) {
init();
}
this.dialog.setVisible(true);
}
 
protected void close() {
this.dialog.dispose();
this.dialog.setVisible(false);
}

public void setFrame(JFrame frame){
parentFrame = (JFrame)frame;
}

public static void main(String args[]){
CountDownDialog obj = new CountDownDialog();
obj.init();
obj.show();

}
}

Thanks in advance.

[pete stein]

If you set a JPanel's layout to "null" and then add a component to the JPanel, you are fully responsible for setting the component's position and size (often done with a call to the component's setBounds() method).

I advise against your using null layouts unless you have a very good reason to do so.

[Seema Sharma]

Hi,
The code mentioned in previous mail is not accepting any changes if i comment line (1) and (2) as mentioned in code.
1. I tried using Border layout but no changes are reflected.
2. I am trying to change the title bar color by using the following line of code but no changes are reflected:

   
UIManager.put("activeCaption", new javax.swing.plaf.ColorUIResource(Color.YELLOW));
 

what went wrong in the code in the previous mail.

Thanks in advance.

[Michael Dunn]

> UIManager.put("activeCaption", new javax.swing.plaf.ColorUIResource(Color.YELLOW));

where you copied that line from, also copy/include the line that follows

[Seema Sharma]

hi,
I have include the code for changing title bar color, i.e., lines (a) and (b), after my dialog box instance is created. Here my dialog box is a parent frame. Yet changes are not reflected in my code.

  
this.dialog = new JDialog(this.parentFrame, "Copie", true);
UIManager.put("activeCaption", new javax.swing.plaf.ColorUIResource(Color.YELLOW));  //(a)
JFrame.setDefaultLookAndFeelDecorated(true); //(b)
this.dialog.getContentPane().add(createPane());

Please let me know.

Thanks in advance.

[Michael Dunn]

> I have include the code for changing title bar color, after my dialog box instance is created.

if you ordered a new car, would you wait until after it was built to tell them what color you wanted?

if you want this for a dialog
JFrame.setDefaultLookAndFeelDecorated(true);
change to
JDialog.setDefaultLookAndFeelDecorated(true);

[Seema Sharma]

Thanks Michael,
I got it. The code is working now.

Regards,
Seema