What is the magic decoder ring for matching library versions in QML?

PJM4B

I'm a novice to QML and have been having trouble grokking the library versions and properties in the QML framework.

Which version of various libraries do I use? If I grep the examples directory I get something like this:

pmoran@EB840PMORAN MINGW64 /c/Qt/Examples/Qt-5.10.1
$ grep -r QtQuick.Controls . | cut  -d ':' -f4 | sort -u

        qputenv("QT_QUICK_CONTROLS_1_STYLE", "
    import QtQuick.Controls.Material 2.1
/ExtrasImports/QtQuick/Controls/Styles/Flat");
\printuntil import QtQuick.Controls 2.1
Binary file ./datavisualization/build-qmlsurface-Desktop_Qt_5_10_1_MinGW_32bit-Debug/debug/qmlsurface.exe matches
Binary file ./datavisualization/build-qmlsurface-Desktop_Qt_5_10_1_MinGW_32bit-Debug/debug/qrc_qmlsurface.o matches
import QtQuick.Controls 1.0
import QtQuick.Controls 1.0 as Controls
import QtQuick.Controls 1.1
import QtQuick.Controls 1.2
import QtQuick.Controls 1.4
import QtQuick.Controls 1.4 as Controls
import QtQuick.Controls 1.5
import QtQuick.Controls 2.0
import QtQuick.Controls 2.0 as C2
import QtQuick.Controls 2.0 as QQ2
import QtQuick.Controls 2.0 as QQC2
import QtQuick.Controls 2.1
import QtQuick.Controls 2.1 as QQC2
import QtQuick.Controls 2.2
import QtQuick.Controls 2.3
import QtQuick.Controls.Imagine 2.3
import QtQuick.Controls.Material 2.0
import QtQuick.Controls.Material 2.1
import QtQuick.Controls.Material 2.2
import QtQuick.Controls.Private 1.0
import QtQuick.Controls.Private 1.0 as QQCPrivate
import QtQuick.Controls.Styles 1.0
import QtQuick.Controls.Styles 1.1
import QtQuick.Controls.Styles 1.2
import QtQuick.Controls.Styles 1.3
import QtQuick.Controls.Styles 1.4
import QtQuick.Controls.Styles.Flat 1.0 as Flat
import QtQuick.Controls.Universal 2.1

As you can see I get QtQuickControl version 1.0, 1.1, 1.4, 1.5, 2.0, 2.1, 2.2, 2.3. How do I mix and match components?

SGaist

Hi,

For new projects. use QtQuick.Controls version 2 as their performances are way better than the version 1. You can mix both if the control you need is not available in QtQuick.Controls 2.

Otherwise it boils down to the minimal version that provides the features you need and the compatibility you want.

PJM4B

I think my question wasn't formulated correctly.
I am wondering how to match the correct versions of libraries.
For example how would I know that these libraries all go together?

import QtQuick 2.1
import QtQuick.Layouts 1.3
import QtQuick.Controls 2.3
import QtQuick.Window 2.3
import QtQuick.Scene3D 2.0

SGaist

You can see that in the documentation of the types you are using.