Solved

setting waiit cursor after calling a jdialog doesn't work

Posted on 2010-11-18
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Last Modified: 2012-05-10
Hi, I have below code.

MyUpload mu = new MyUpload((Frame)this.getParent(), true, mc.getEmp(), mc.getCid(), getCodeBase());
if(mu.result.equals("Completed")){
    getMRec();
}

and MyUpload.java looks like this:
public MyUpload(java.awt.Frame parent, boolean modal, String empNum, String contID, URL codeBase) {
    super(parent, modal);
    ...
}

MyUpload is a JDialog where some file upload gets done. Once the upload is done the result is stored in mu.result, then it runs getMRec() function from the main frame.

getMRec() has following simple logic that set the cursor "busy" while it's doing some job:
void getMRec(){
    getRootPane().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    doSomething();
    getRootPane().setCursor(null);
}

After uploading is done from the dialog and the dialog is closed, and doSomething() from getMRec() has executed fine but the cursor never changed to a busy cursor. If I comment out the dialog part then the cursor changes to a busy cursor while doSomething() is running. Any idea why?
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Question by:shepp_it
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9 Comments
 
LVL 92

Expert Comment

by:objects
ID: 34169466
Swing is single thread so you need to switch the cursor from the event dispatch thred
and do your processing in a seperate thread

http://helpdesk.objects.com.au/java/how-do-i-update-my-gui-from-any-thread

you may also find the swing worker useful

http://download.oracle.com/javase/tutorial/uiswing/concurrency/worker.html
0
 

Author Comment

by:shepp_it
ID: 34174466
getRootPane().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
doProcess();
getRootPane().setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));

Above works fine.
It just won't work if I have a code that pops up JDialog as below;

MyDialog md = new MyDialog((Frame)this.getParent(), true);
getRootPane().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
doProcess();
getRootPane().setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));

If I use JOptionPane instead of JDialog then it works fine:

Object objStr = JOptionPane.showInputDialog(getRootPane(), "Please choose a payroll period", "Payroll",
            JOptionPane.QUESTION_MESSAGE, null, payroll, null);
getRootPane().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
doProcess();
getRootPane().setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));

I'm using it on applet. it could be why?
0
 
LVL 92

Expert Comment

by:objects
ID: 34177208
The JDialog is a top level window, you need to set the cursor on it
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Author Comment

by:shepp_it
ID: 34177231
I want to set cursor after I close the jdialog.

//pop up a dialog
MyDialog md = new MyDialog((Frame)this.getParent(), true);

//once finished with dialog, change the cursor
getRootPane().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
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LVL 92

Accepted Solution

by:
objects earned 500 total points
ID: 34177296
then use a WindowListener to change the cursor
0
 
LVL 92

Expert Comment

by:objects
ID: 34177321
0
 

Author Comment

by:shepp_it
ID: 34183954
Man you're awesome!!!!!!!! I don't know why I never thought about a WindowListener!!
Thank you!
0
 

Author Comment

by:shepp_it
ID: 34183980
For those who's having the same problem, in above example it's using windowClosing but I used windowClosed event instead to get it working in my case. My code:
My_Upload mu = new My_Upload((Frame)this.getParent(), true, mc.getEmp(), mc.getCid(), getCodeBase());
mu.setLocationRelativeTo(this);
mu.setVisible(true);
mu.addWindowListener(new WindowAdapter(){
    public void windowClosed(WindowEvent we){
        getRootPane().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    }
});
        
if(mu.getResult().equals("Completed")){
    mu.dispose();
    getMyRec();
}

...

private void getMyRec(){
    try {
        if(getRootPane().getCursor()!=Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR)){
            getRootPane().setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
        }
        
        // do something here...
    }finally{
        getRootPane().setCursor(Cursor.getDefaultCursor());
    }
}

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Author Comment

by:shepp_it
ID: 34184006
I'm sorry, actually I have to use windowClosing event, not windowClosed. Using windowClosed will cause the cursor never going back to the default cursor... !
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