Qt::WA_PaintOnScreen and WA_NativeWindow problem
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I'm creating QWidget and setting
setAttribute(Qt::WA_PaintOnScreen, true); setAttribute(Qt::WA_NativeWindow, true);for GPU rendering , and I'm returning nullptr into paintEngine() const;
But sometimes I need to disable them by:setAttribute(Qt::WA_PaintOnScreen, false); setAttribute(Qt::WA_NativeWindow, false);and returning QWidget::paintengine() into paintEngine() const, instead of nullptr.
but Qt is not drawing anything.
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@Alatriste
Hello,
Once your widget is native (meaning it has an OS specific handle attached to it) there is not turning back. The only way to make it non-native again is to destroy and create it anew. I don't know about the paint on screen attribute, but I'm pretty sureQWidget::paintEngine()works in a similar fashion. In the end, why would you need to do these things anyway?0Even if we accept, as the basic tenet of true democracy, that one moron is equal to one genius, is it necessary to go a further step and hold that two morons are better than one genius?
1 Replies
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@kshegunov Thank you for this information. It's bad that I must recreate a widget. I need this switching for some test.
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@Alatriste
Maybe if you describe your use case, I might be able to suggest some alternative. What is exactly that you're trying to achieve?0Even if we accept, as the basic tenet of true democracy, that one moron is equal to one genius, is it necessary to go a further step and hold that two morons are better than one genius?
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@kshegunov I'm trying to render into this widget by DirectX and disabling all qt draws, but after some time I want to enable Qt draws and disable DirectX rendering. Is this information enought?
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@Alatriste
I got that from your original question, my wondering was more to the why. Anyway. The most simple thing I can suggest is to put your DX and your Qt-drawn widget into aQStackedWidgetand when you need to just switch the pages. Is this something that works for you?Kind regards,
0Even if we accept, as the basic tenet of true democracy, that one moron is equal to one genius, is it necessary to go a further step and hold that two morons are better than one genius?
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@kshegunov Good idea but that dont works for me.. So the only way to do this, recreating widget. thanks .
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@Alatriste
At least the only one I know of. I guess there is even the possibility to not use stacked widget at all, but have two toplevel widgets and switch them by hand, but this is pretty much what the stack widget does ...
