How-To Progress Monitor

[Holger Mappt]

Hi Wiktor,

PleaseWaitRunnable does the trick, thank your for pointing me to it. 
Method "cancel" handles the cancel event, I do not need to watch 
progressMonitor.isCancelled().

At the end of my task that is now in realRun() I have a 
Notification(tr("Message")).show() that triggered some EDT violations, 
but I found the GuiHelper.runInEDT() that fixes that.

Thanks,
Holger


Am 22.10.2016 um 18:40 schrieb Wiktor Niesiobedzki:
> Hi,
>
> I guess that you may find
> org.openstreetmap.josm.gui.layer.gpx.DownloadWmsAlongTrackAction
> helpful. This is the class that downloads WMS along GPX track. Let me
> give you a short guide around the code:
>
> PrecacheWmsTask is the class that is executed in background. The task
> is submitted to background thread for execution as:
> Main.worker.execute(task);
>
> It means that task is executed in one shared background thread across JOSM.
>
> PrecacheWmsTask.realRun method implements, what needs to be done in background.
>
> To implement user friendly Progress Monitor you can do as follow:
> use: progressMonitor.setTicksCount(int) to set how many units of work
> (ex. images) you have at the begging of realRun()
> and then, when unit of work is done, use progressMonitor.worked(1) to
> notify, that one unit is already done (ex. one image is processed)
>
> You should also watch progressMonitor.isCancelled() to shut down your
> background work if user cancels it.
>
> I guess this has helped you.
>
> Cheers,
>
> Wiktor
>
>
> 2016-10-22 17:07 GMT+02:00 Holger Mappt <holgerosm at gmx.net>:
>> Hi,
>>
>> I'm writing a plugin that processes a number of images after a menu item was
>> selected.  What is the right way to do that in a way that doesn't block the
>> GUI with an indication of the progress?  I guess I have to run some kind of
>> task that updates the progress after every image.  Then some GUI component
>> displays a progress bar (with an optional cancel button).  I implemented
>> something that is based on javax.swing.ProgressMonitor and
>> javax.swing.SwingWorker according to the code sample from the Java tutorial
>> (https://docs.oracle.com/javase/tutorial/uiswing/examples/components/ProgressMonitorDemoProject/src/components/ProgressMonitorDemo.java),
>> but it's not working.  The progress window opens after the 101st image and
>> then blocks the execution of the task.
>>
>> What is the recommended JOSM way to do that?  Is there a good example where
>> I can learn from?  JOSM has a ProgressMonitor interface and some classes
>> that implement it, but there is no documentation and the plugins I looked at
>> are quite complex with an endless chain of subroutines.  Any help is
>> appreciated.
>>
>> Thanks,
>> Holger
>>
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>