Hard awt problem.

Question

Introduction:
An applet opens a modal java.awt.Dialog. The dialog contains a grid for displaying data. When the dialog is opened a separate thread is fetching data from the server. When the data arrives it is displayed in the grid in the dialog. The grid adds a scrollbar to itself whenever required (if the number of rows to be displayed is greater than the number of rows that fit inside the visible part of the grid).
The code for adding/ removing the scrollbar is in the doLayout() method of the Grid.
Problem:
When I call invalidate() or validate() on the grid in the modal dialog the call hangs until the modal dialog returns from it�s setVisible() method. Why ???! It seems to be impossible to trigger a refresh of the layout of the grid programmatically. If I do not refresh the layout the scrollbar will only get added if I resize the window or in any other way make the system trigger a refresh of the layout. When I use the same Grid in any Container that is not a modal dialog there is no problem at all.
What is the reason for this behavior, and how do I solve the problem?
Ragnvald

Answer 1

Thanks Luke, but that doesn�t work for me.
This is an awt- applet, supposed to run on IE without signing or any additional downloading. That implies java 1.1.8 only. awt and no swing. And all the security restrictions apply as well.
There must be a workaround!!!!
The swing you provided has it�s equivalent in awt://1.1.8:
Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(event);
//and 1.2:
Toolkit.getEventQueue().postEvent(new InvocationEvent(Toolkit.getDefaultToolkit(), runnable));The problem is the applet restriction. I get an exception:
SecurityException at getSystemEventQueue
There has got to be another solution!
Ragnvald.