launch in a gif via QMovie and QThread

[desch]

Hi,

I try to launch a throbber (just a gif) during intensive process.

1) I tried to launch it directly like

QMovie movie(":/throbber.gif");
movie.start();
label->setMovie(movie);
 
...
//intensive process

QMovie movie(":/throbber.gif");
movie.start();
label->setMovie(movie);

...
//intensive process

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The gif doesn't move at all during process and start moving after the intensive process

2)Using a QThread

CThreadMovie::CThreadMovie(QMovie *	movie)
{
	_movie = movie;
}
 
void CThreadMovie::run()
{
	if (_movie != NULL)
		_movie->start();
 
	exec();
}

CThreadMovie::CThreadMovie(QMovie *	movie)
{
	_movie = movie;
}

void CThreadMovie::run()
{
	if (_movie != NULL)
		_movie->start();

	exec();
}

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I launch with this interface:

QMovie * movie = new QMovie(":/throbber");
	labelThrobber->setMovie(movie);
 
	// create Thread instance
	_threadMovie = new CThreadMovie(movie);
 
            _threadMovie->start();

QMovie * movie = new QMovie(":/throbber");
	labelThrobber->setMovie(movie);
	
	// create Thread instance
	_threadMovie = new CThreadMovie(movie);

            _threadMovie->start();

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It doesn't work

So the questions

What do I do wrong?
What should I do?

Thanks to all

David

[jpn]

You must not touch widgets in worker threads. Either handle that "intensive process" in a worker thread and deliver results to main GUI thread with signals and slots (or custom events) or call QCoreApplication::processEvents() every now and then in the middle of the "intensive process".

[desch]

OK

As we have made all our process in one thread; it's not a simple work to change the complete application to Muti Thread

So for just running a Gif Is there a simple way (something very light)?

Thanks

David

[jpn]

You must let the application process its events meanwhile you do intensive work which blocks the event loop. So as I said, call QCoreApplication::processEvents() every now and then during the intensive work.