[PyQt] QWebEnginePage API for callbacks

[David Cortesi]

In Qt5.4, the new QWebEngine interface takes account of the fact that the
underlying Chromium engine is asynchronous. Four of the methods of
QWebEnginePage take an argument "FunctorOrLambda" as a callback to receive
control when the result is ready (for example, [1]).

Using PyQt, I assume we can pass a Python defined function or lambda in
this position?

I'm a bit at a loss what to do following a call to such a method. What is
the best way to "idle" until the callback comes? n.b. I don't see any
WebEngine specific guidance at the PyQt5 doc [2].

Thanks for any suggestions,
Dave Cortesi

[1] http://doc.qt.io/qt-5/qwebenginepage.html#toPlainText

[2] http://pyqt.sourceforge.net/Docs/PyQt5/pyqt4_differences.html
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