Putting a QGraphicsScene into QMdiSubWindow

**steg90** · 2nd October 2007, 09:26

Hi,

I have a MDI application. I have created a QGraphicsScene / QGraphicsView. I was wondering how I could put this into my QMdiSubWindow. I did do the following, but this doesn't seem correct as the scenes background isn't blue and the paint event is not being called on the graphics item?

Qt Code:

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CanScene canScene;
	QGraphicsView view(&canScene);
 
	QMdiSubWindow* subWindow = m_pworkspace->addSubWindow( &view );
	subWindow->setWindowIcon(QIcon(QString::fromUtf8(":/QTCanMonitor/Resources/Winamp.png"))); 
	subWindow->setMinimumSize( 200, 200 );
 
	canScene.setBackgroundBrush(Qt::blue);
	view.resize(500,500);
	view.scale(0.95,0.95);
	view.show();

CanScene canScene;
	QGraphicsView view(&canScene);

	QMdiSubWindow* subWindow = m_pworkspace->addSubWindow( &view );
	subWindow->setWindowIcon(QIcon(QString::fromUtf8(":/QTCanMonitor/Resources/Winamp.png"))); 
	subWindow->setMinimumSize( 200, 200 );

	canScene.setBackgroundBrush(Qt::blue);
	view.resize(500,500);
	view.scale(0.95,0.95);
	view.show();

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Regards,
Steve

**marcel** · 2nd October 2007, 09:48

Create the scene on the heap. In your code, the scene gets deleted as soon as the function exists.

**steg90** · 2nd October 2007, 09:53

Thanks.

Ok, tried that, this is what I now have :

Qt Code:

Switch view

CanScene* pcanScene = new CanScene(this);
	pcanScene->setSceneRect( QRectF( 0, 0, 5000, 5000 ) );
	pcanScene->setBackgroundBrush(Qt::blue);
	QGraphicsView view(pcanScene);
 
	QMdiSubWindow* subWindow = m_pworkspace->addSubWindow( &view );

CanScene* pcanScene = new CanScene(this);
	pcanScene->setSceneRect( QRectF( 0, 0, 5000, 5000 ) );
	pcanScene->setBackgroundBrush(Qt::blue);
	QGraphicsView view(pcanScene);

	QMdiSubWindow* subWindow = m_pworkspace->addSubWindow( &view );

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Still not blue background and paint event not being called?

Regards,
Steve