Is it possible to load QtCharts library with only QML without Qt/C++?

[utestrauss]

Hi, I am a newbie in Qt/QML and need some help. As the title says, is it possible to load QtCharts library with only QML without Qt/C++ stuff? I need to develop a UI application with a chart using QML. This application runs on an embedded system on the client side. I have compiled the QtChart project as a static or shared library, but I can't get this library to work. When I try to import a static library (libqtchartsqml2.a), I get the error message "module "QtCharts" is not installed import QtCharts 2.1 ^". The libqtchartsqml2.a file is located in the path specified in the importPaths configuration, as described here. When I try to import a shared library, the application crashes with a trace, but I can't figure out what the problem is. Does anyone have a suggestion on how I can load a static or shared library into QML? I can post the trace here, but it is about 90 lines long.

[lemons]

@utestrauss
Unfortunately I never tried to add QtCharts as static shared library.

I do the following in embedded yocto projects, maybe this helps you:

1. add QT += charts to .pro file
2. replace QGuiApplication with QApplication in main.cpp
   -> required by QtCharts
3. add qtcharts to yocto local.conf, rebuild embedded image and install it to the device

IMAGE_INSTALL_append = " [... other used libraries ...] \
 qtvirtualkeyboard \
 qtcharts \
"

Note: qtcharts creates 3 packages for the embedded OS with a total of about 0.5MB:
libqt5charts
libqt5charts-plugins
libqt5charts-qmlplugins

[utestrauss]

@lemons Thanks for the guide. I have a slightly different use case. Unfortunately I can't access the C++ side, I only work with QML files. At least I found a QML implementation of a chart library and try my luck with that.

Anyway, it would be great if someone writes how to make QTCharts work with QML only.

[piervalli]

@utestrauss I used this library, It is very simple, it depends what you need.
https://github.com/qyvlik/Chart.qml. It is only qml (js)

[fcarney]

I am very confused by this thread. How do you use QML without C++? Ultimately you will find something that cannot be done and have to use C++ to solve the problem. Are there build systems that don't even have you compile the main.cpp?

[utestrauss]

@piervalli Thanks, I use this library too. However, I wanted to use something more solid.

@fcarney I can't tell exactly how the client's embedded system works, but yes, I am able to write UI using QML only. After deploying to the embedded system, it will be loaded and executed by QGuiApplication. At least in the trace I mentioned in the topic, I see Qt classes listed.

[piervalli]

@fcarney
We can write a core where you can espose all method to Qml. In this way UI can be adapted many screen without change the core.