How do I get a snapshot of a widget ?

[Nfrancisj]

I'm using PySide2, to create a node graph based widget, which is set inside a scrollarea.

I would like to save a snapshot of all the nodes inside my scrollarea. Currently I have to take a screenshot, scroll, and take another, and another, then I have to use photoshop to stitch them together. (basically pan and use snipping tool and stitch to make a image with all my nodes.)

I found this on Stack,
.grabWidget() & .grab() but it says in the Qt docs that it has been discontinued. If i implement it anyway, it crashes my program.


QtGui.QPixmap.grabWidget(widget)

https://stackoverflow.com/questions/21609429/how-to-take-a-screenshot-of-a-pyside-widget-that-is-a-window-and-include-the-ti



Is there another way to create a snapshot?

[d_stranz]

Create a QImage then pass it to the QWidget::render() method.

[Nfrancisj]

Thanks for your reply, d_stranz.

So, I'm get False when I run my code. What did I miss?


file = QtCore.QFile("E:/Junk/myFile.png")
file.open(QtCore.QIODevice.WriteOnly)

myWidget = getActiveWidget() # just returns the widget

pix = QtWidgets.QImage()

myWidget.render(pix)

pix.save(file)


Thanks!

[d_stranz]

You probably need to create the QImage with the correct size and format before you can render to it.

[Nfrancisj]

You probably need to create the QImage with the correct size and format before you can render to it.

Yup! That was it. Thank you.

pix= QtWidgets.QImage(wid.size(),QtWidgets.QImage.Forma t.Format_ARGB32)

[Nfrancisj]

Turns out the widget was a QGLWidget. :D

I came across another issue that I'd hoping to get help with. I used .grabFrameBuffer() and was successful in getting the widget to save. The issue I have now is it's only saves what is visible- the items cutoff by the widget is not rendered to file.
It does show all the nodes in the little preview on the bottom right corner, even though its beyond the QGLWidget , so it does know it exists.

Is there a way to render everything that is on the widget, and not just what is visible ?

Thanks,

Nick