Greetings, Ulf,
thank you for your prompt response.
Date: Thu, 10 Nov 2022 09:53:18 +0100
From: Ulf Hermann <ulf.herm...@qt.io>
To: interest@qt-project.org
Subject: Re: [Interest] Scripting within Qt6 and QJSEngine
Hi Filippo,
the equivalent to Q_OBJECT for value types is Q_GADGET. So, your data
structure would look like this:
struct DataPoint
{
Q_GADGET
Q_PROPERTY(double x MEMBER x)
Q_PROPERTY(double y MEMBER y)
public:
double x;
double y;
}
Good, thank you, I'll test that.
Now, depending on what you want to do with that in JS it may or may
not work. I'd need some more details there.
Sure:
DataPoint is the basic (x,y) data holder for an application that displays curves
(mass spectra) with millions of these DataPoint_s. For example, Trace is a
std::vector<DataPoint>. It derives from QObject, precisely with the idea of
making it JScriptable. Trace objects are then plot in widgets to show the
"curve".
NB: In QML (as opposed to JS) you can register named value types these
days. There is the QML_VALUE_TYPE macro. In QML value types can be
constructible and/or structured, offering different ways to create
them from JS expressions. Finally, in QML, value types can be stored
in lists. You can have "property list<dataPoint>" if you use QML for
your scripting.
That is an intesting question because it somehow pin points something that is
not clear to me. Perusing the documentation, I saw that QQmlEngine derives from
QJSengine. I cannot figure out which is best to employ in my use case:
scripting a QtWidgets C++ application. Can I use QML as a scripting language in
a currently C++-only program ?
Thanking you again,
Sincerely,
Filippo
--
⢀⣴⠾⠻⢶⣦⠀ Filippo Rusconi, PhD
⣾⠁⢠⠒⠀⣿⡁ Research scientist at CNRS
⢿⡄⠘⠷⠚⠋⠀ Debian Developer
⠈⠳⣄⠀⠀⠀⠀ http://msxpertsuite.org
http://www.debian.org
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