On 12/16/2010 07:03 PM, ext Michael Ditum wrote:
1. What's the best way of handling adding event listeners and raising
events with my javascript API?
Currently I'm using the following syntax to assign an event listener...
JSBinding.onEvent = "CallFunction()";
and then I use QWebFrame's evaluateJavaScript to raise the event. This
has a couple of down sides; Only one event listener can be registered at
once, it's not easy to pass parameters into the function and it's
handled differently to adding normal js event listeners. Is there any
way to be able to pass a javascript function in so I can store that and
then call it later on with the parameters I need? I've tried specifying
the function's parameter as a QVariant but the function just seems to be
provided as a VariantMap with 0 items.
The solution commonly used is to do a signal-"slot" connection between a
signal from Qt and a Javascript function:
someObject.youSignal.connect(jsFunction);
2. Is it possible to return an object from a javascript call that
behaves like an object added with addToJavaScriptWindowObject ?
I can easily returns ints, strings, lists of strings and integers, etc.
I've also been able to return the equivalent of a JSONified object (i.e.
just data) by returning it as a QMap<QString, QVariant>, however what I
would like to do is is return an object that has properties and methods
(through slots) so the javascript can interact with my c++ objects
directly. If I try to return an object I get a compiler error saying
that QObject's copy constructor is private, if I return a pointer to an
Object I get an empty string returned and if I try and return the object
inside a QVariant I again get copy constructor compiler errors. I don't
know if I'm doing something incorrectly to cause these compiler errors
or if it's just not currently possible.
Both of these issues I can easily work around (evaling code for 1 and
providing a procedural style API for 2) so if these things are not
possible it's not a huge deal. I just wanted to make sure I hadn't
missed anything before I set my Javascript API in stone.
Passing a QObject by value cannot work.
From a quicklook at convertQVariantToValue(), I think passing a pointer
should work. A QVariant with with the type QMetaType::QObjectStar should
give you a nice conversion.
I suggest you to set a breakpoint in convertQVariantToValue
(qt_runtime.cpp) to figure what is happening in your app.
cheers,
Benjamin
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