[Qt-embedded-interest] Generating Javascript events from QtWebKit

[Darren New]

I'm using Qt 4.5.2 to create a web interface for applications on an
embedded MIPS-based box.

 

I have a plug-in working, and I can link a C++ object that controls the
front-panel LEDs into Javascript (via addToJavaScriptWindowObject) , so
I can blink the LED from a web page. That all works great.

 

What I can't seem to find is a mechanism for letting C++ generate an
event at the Javascript level. I would like to be able to generate a
javascript event when (for example) the barometer changes or the quality
of the wifi signal drops. That is, I'd like to generate an arbitrary
javascript event that an HTML/JS application could listen for.

 

The only obvious interface to WebKit from Qt for something like that is
the evaluateJavaScript function, but it seems odd that I would need to
construct a call to create, populate, and dispatch an event by building
a javascript string without support closer to the kind of thing the
addToJSWindowObject supports.

 

Any hints on how to invoke an event from within a C++ Qt application
that'll trigger listeners in WebKit javascript? Also, is that going to
work invoked from a different thread, or must it be some thread
associated with webkit somehow?

 

Thanks in advance for any hints!

--Darren

 




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