[Qt-interest] QGraphicsScene problem

[Scott Aron Bloom]

Not directly no...

 

You can only modify a GUI object from the GUI thread...

 

Use a auto connected signal to communicate from the worker thread to the
GUI

 

Scott

 

From: Patric [mailto:userqt at gmail.com] 
Sent: Saturday, August 29, 2009 1:46 AM
To: Scott Aron Bloom; qt-interest at trolltech.com
Subject: Re: [Qt-interest] QGraphicsScene problem

 

Can I operate on QGraphicsScene from different thread, not the main
thread ? 

	----- Original Message ----- 

	From: Scott Aron Bloom <mailto:Scott.Bloom at sabgroup.com>  

	To: qt-interest at trolltech.com 

	Sent: Saturday, August 29, 2009 11:21 AM

	Subject: Re: [Qt-interest] QGraphicsScene problem

	 

	The timer is owned/constructed in one theread, and is being
started/stoped by the worker thread.

	 

	Try calling moveToThread to move the timers into the worker
thread...

	 

	Scott

	 

	From: qt-interest-bounces at trolltech.com
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of Patric
	Sent: Saturday, August 29, 2009 1:11 AM
	To: qt-interest at trolltech.com
	Subject: [Qt-interest] QGraphicsScene problem

	 

	Hello guys, 

	I have QGraphicsScene here with items on it. 

	 

	I have manual control (i.e. keyboard events) and also auto
control (through a thread which makes all the calculations where these
QPixmapItems should interact). 

	 

	When I control them, everything is OK. 

	But when I start the auto control, i.e. my thread which
simulates the actions, I'm observing a very strange behaviour. It's a
game actually, it's turn based. 

	So somethimes the objects on the board are just not moving on
their turns. 

	 

	I have implemented this simulation engine with the technique
used in the Mandelbrot example. 

	 

	In my MainWindow class I have instance of the engine thread, and
when some button in the GUI is pressed MainWindow calls a method in the
thread (directly), which wakes the thread. 

	And I'm getting this shit : 

	 

	QObject::killTimer: timers cannot be stopped from another thread


	QObject::startTimer: timers cannot be started from another
thread

	QObject::killTimer: timers cannot be stopped from another thread

	QObject::startTimer: timers cannot be started from another
thread

	QObject::killTimer: timers cannot be stopped from another thread

	QObject::startTimer: timers cannot be started from another
thread

	 

	Any ideas why ? 

	 

	Regards, 

	Patric

	 

	p.s.:in the end of the thread's run method there is sleep call
also. 

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