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List:       kde-devel
Subject:    Plasma::Applet eats cpu
From:       Christophe Thommeret <hftom () free ! fr>
Date:       2008-11-14 10:52:42
Message-ID: 200811141152.43056.hftom () free ! fr
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Hi all,

I'm trying to write a little applet that redraws each 100ms.
The problem is that plasma then eats a lot of cpu (~20% of athlonxp@2.2GHz)!
I do it this way:


MyApplet::MyApplet( QObject *parent, const QVariantList &args )  
:Plasma::Applet(parent, args)
{
	setBackgroundHints(DefaultBackground);
	resize(200, 200);
	rCol = 0;
	startTimer( 100 );
}

void timerEvent( QTimerEvent* ) {
	if ( ++rCol > 255 )
		rCol = 0;
	update();
}

void MyApplet::paintInterface( QPainter *p, const QStyleOptionGraphicsItem*, 
const QRect &contentsRect )
{
	p->save();
	p->setBrush( QColor(rCol,128,128) );
	p->drawRect( contentsRect );
	p->restore();
}


I guess it's not the right way, so if anybody can give me a hint..

 
-- 
Christophe Thommeret

 
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