Re: [platform-swt-dev] Multi-Threaded Applications

[Steve Northover <Steve_Northover@xxxxxxxxxx>]

BusyIndicator.showWhile() doesn't create
a thread, it just runs a runnable in the user interface thread.  You
need to create the thread, start() it and communicate with the user interface
using Display.syncExec() and Display.asyncExec().

"Shaffin Bhanji" <shaffin_bhanji@xxxxxxxx>
Sent by: platform-swt-dev-admin@xxxxxxxxxxx

01/14/2005 06:47 PM

Please respond to
platform-swt-dev

To	<platform-swt-dev@xxxxxxxxxxx>
cc
Subject	[platform-swt-dev] Multi-Threaded Applications

Hello All,
 
I have an application built using SWT. I have a time consuming
Thread process as follows:
 
public class ExpandThread_C extends Thread
{
    final private Display __display;
    final private Shell __window;
    final private ProgressBar __progress;
    /**
     * Constructor
     */
    public ExpandThread_C( final Shell window, ProgressBar progress
)
    {
        super();
        this.__display = window.getDisplay();
        this.__window = window;
        this.__progress = progress;
    }
 
    /**
     * Run process
     */
    public void run()
    {
        //Update the progress
        updateProgress();
        this.__window.update();
// this doesnt update the application window
        this.__window.redraw();
// nor does this doesnt update the application window
    }
 
    /**
     * Update progress
     */
    public void updateProgress()
    {
        __display.syncExec(
                new Runnable()
                {
                    public
void run() 
                    {
                    
   this.__progress.setSelection(1);
               
    }
                }
        );    
    }
 
}

In my application I call the Thread using the BusyIndication class as follows:
 
BusyIndicator.showWhile( shell.getDisplay(), new ExpandThread_C(
shell, progress ) );
 
The problem I have is that the process takes almost 3-4
minutes and during the time if I minimize and maximize the application
window, my application is locked up!!! Am I missing something or is this
not the correct way to run the thread? I want my application window to
always be available and responsive to the user, any suggestions and/or
feedback is greatly appreciated.
 
Thank you,
Shaffin.