Conditional Import

rhb327

I'm trying to use loader to do something like:

import yada 1.0
import whatever 2.0

Loader {
    source:  condition ? "import.qml" : ""
}

Rectangle {
...

where import.qml contains only:

import MyQml 1.0

I'm receiving a expected token 'numeric literal' syntax error. Any ideas to resolve this error or a conditional import example to share?

Thanks,
-Rich

eyllanesc

@rhb327 Please put the real code and not pseudo code, also indicate what the .qml names are. For example in your first code there are 2 roots(Loader and Rectangle). In problems where a syntax error is pointed out then the real code is necessary.

IntruderExcluder

QML is declarative, you can't do such things. If you want to achieve some dynamic behaviour for your scene you can use Loader or Component.
You can also try qmlRegisterModule which allows imports without any registered types inside.

rhb327

Actual source snippets...

import QtQuick 2.0
import MyController 1.0

Loader {
    source: !RUN_ON_WINDOWS ? "wifi_single.qml" : ""
}

CustomController{
    property bool fwUpdtProgress: false
    property bool autoFwUpdate: false
...

And wifi_single.qml:

import Wifi.Singleton 1.0

RUN_ON_WINDOWS is defined in another module as:

#ifdef Q_OS_WIN
    viewer.rootContext()->setContextProperty("RUN_ON_WINDOWS", QVariant(true));
#else
    viewer.rootContext()->setContextProperty("RUN_ON_WINDOWS", QVariant(false));
#endif

Error is:

wifi_single.qml:2: error: Expected token `numeric literal'

Thanks,
Rich

raven-worx

@rhb327
better use the following in QML:

Qt.platform.os === "windows"

And wifi_single.qml:

import Wifi.Singleton 1.0

so your "wifi_single.qml" just contains the import statement?!

rhb327

I don't seem to be able to use if(Qt.platform.os === "windows") for conditional imports. This only works in code regions from what I can tell.

if(RUN_ON_WINDOWS) also works in code regions but not for conditional imports.

Thanks,
-Rich

raven-worx

@rhb327
i proposed this to use instead of your context property approach.
conditional imports are jsut not possible in QML.

You can use Loader to load components/QML-files which use 2 different imports.

But to me it rather seems that your issue lies somewhere else. Why do you need 2 different imports for different platforms in the first place?

caicx

@raven-worx

import QtGraphicalEffects 1.0 // Required by Qt 5.x.x
vs
import Qt5Compat.GraphicalEffects // Required by Qt 6.x.x

fcarney

This post is deleted!

raven-worx

@caicx said in Conditional Import:

import QtGraphicalEffects 1.0 // Required by Qt 5.x.x
vs
import Qt5Compat.GraphicalEffects // Required by Qt 6.x.x

yes and?
Since the major version of Qt has changed you should also advance with your project, instead of importing a compat module of a previous version for the whole lifespan of Qt 6.
The compat module is intended to be used as a quick solution until the porting of your application to Qt6 has finished