Rendering QWidget with children overriding paintEvent

Josselin

Hello,

I want to render a widget to save it in clipboard.
Widget has children and one of them override paintEvent, setting transformations on a custom QPainter.

void ImagesUtils::enregisterDansClipboard(QWidget* parent, QWidget* widgetACapturer)
{
	QPixmap pixmap(widgetACapturer->size());
	widgetACapturer->render(&pixmap, QPoint(), QRegion(0, 0, widgetACapturer->size().width(), widgetACapturer->size().height()));
	QApplication::clipboard()->setImage(pixmap.toImage());
}

void WidgetAxe::paintEvent(QPaintEvent *event)
{
	QPainter* painter = new QPainter(this);

	painter->translate(rect().topRight());
	painter->rotate(-90);
	painter->scale(-1.0, 1.0);

	...
}

This widget is drawn (and other children too), but the transformations are ignored. I guess it's is due to the fact that i use a custom QPainter, but I don't know how to resolve it.

Thanks for your help.

SGaist

Hi and welcome to devnet,

Can you provide a minimal compilable example that shows that issue ?

Christian Ehrlicher

@Josselin said in Rendering QWidget with children overriding paintEvent:

QPainter* painter = new QPainter(this);

Do you also delete this painter again? Why do you create it on the heap at all?
And when you don't delete it you likely forgot to call QPainter:end()

Josselin

@Christian-Ehrlicher said in Rendering QWidget with children overriding paintEvent:

@Josselin said in Rendering QWidget with children overriding paintEvent:

QPainter* painter = new QPainter(this);

Do you also delete this painter again? Why do you create it on the heap at all?
And when you don't delete it you likely forgot to call QPainter:end()

Exactly. I forgot to delete my painter. Thanks for your reply, it works perfectly.
The use of pointer is probably a bad habit (I'm a java developer, and i'm converting python code ), when I have to pass my object to a method

Thanks for your help.

jsulm

@Josselin said in Rendering QWidget with children overriding paintEvent:

when I have to pass my object to a method

You can pass a pointer to a stack allocated object