Solved

JMenu and invoking close the window

Posted on 2003-11-26
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Last Modified: 2010-03-31
I created JFrame in the applet, but JMenu is on applet.(It supposed to be on JFrame.)
The following is my code segment.
------------------------------------------
public class LibraryApplet extends JApplet implements ActionListener{
      …
      …
  public void init() {
  myFrame = new JFrame();
  contentPane = myFrame.getContentPane();
  layout = new GridBagLayout();
  contentPane.setLayout(layout);
  constraints = new GridBagConstraints();
       …
       …
   JMenu fileMenu = new JMenu("File");
   JMenuItem exitItem = new JMenuItem("Exit");
   fileMenu.add(exitItem);
    JMenuBar bar = new JMenuBar();
    setJMenuBar(bar);
    bar.add(fileMenu);

    myFrame.pack() ;
  }
--------------------------------------
Another question is that top-level window(JFrame) has a File menu containing a menu item "Exit". When "Exit" is invoked the application will close the window (the user sees an empty applet page with just the title and header)

 How do I implement the above "Exit" behavior?

Thank you for help
0
Comment
Question by:dkim18
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11 Comments
 
LVL 9

Assisted Solution

by:yongsing
yongsing earned 50 total points
ID: 9830114
Change

setJMenuBar(bar);

to

myFrame.setJMenuBar(bar);
0
 
LVL 9

Expert Comment

by:yongsing
ID: 9830116
>> How do I implement the above "Exit" behavior?

How do you want the "Exit" behaviour to be like?
0
 

Author Comment

by:dkim18
ID: 9830138
When "Exit" is invoked the application will close the window (the user sees an empty applet page with just the title and header)
0
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LVL 92

Expert Comment

by:objects
ID: 9830154
myFrame.hide();
0
 
LVL 9

Expert Comment

by:yongsing
ID: 9830163
Add this to your code and see if it helps:

myFrame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
0
 
LVL 9

Expert Comment

by:yongsing
ID: 9830170
Ignore my last comment. objects is right. You need to call JFrame.hide(). You also need to add action listener to your exit menu item:

exitItem.addActionListener(
  new ActionListener() {
    public void actionPerformed(ActionEvent e) {
      ((JFrame)e.getSource()).hide();
    }
  }
);
0
 
LVL 92

Expert Comment

by:objects
ID: 9830171
The window shouldn't be disposed cause the next time the applet is loaded the same window is used.
0
 
LVL 92

Accepted Solution

by:
objects earned 200 total points
ID: 9830176
shouldn't that be:

exitItem.addActionListener(
  new ActionListener() {
    public void actionPerformed(ActionEvent e) {
      myFrame.hide();
    }
  }
);
0
 
LVL 9

Expert Comment

by:yongsing
ID: 9830198
Oh ya, that was a mistake. :-)
0
 

Author Comment

by:dkim18
ID: 9832697
objects
superb!
0
 
LVL 92

Expert Comment

by:objects
ID: 9833720
0

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