[Qt-interest] QWidget Painting and Rendering queries

[Nitin Mahajan]

HI!

1. If I want to display a QWidget on a QPaintDevice at a particular (x,y) point, how to do that? I could see that the QWidget::render() can do that, but I want to position the widget Geometry itself on the QPaintDevice instead of rendering it.

2. How can I convert a QPoint on a QPaintDevice to the one on Global co-ordinate system, just like the QWidget::mapToGlobal does?

3. This point is regarding the QWidget painting. For example I have a widget, which has some animations and hence gets painted time to time. Also I am rendering the complete widget, using QWidget::render function somewhere on a QPaintDevice. Is this widget painting followed by rendering is duplication of effort, somewhere in software? If this understanding of mine is correct, whether there would be no duplication if I make the widget invisible but just keep it rendering on the QPaintDevice alone?

regards

-Nitin



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