QtLocation and QtPositioning not installed

michjans

Hello,
We have a QML application making use of the modules QtLocation and QtPositioning (for showing a Map with MapItems). The application runs fine on linux gcc_64, but when building and deploying it using wasm_32 (webassembly), we get the errors:
module "QtLocation" is not installed
module "QtPositioning" is not installed

It seems that these modules are not yet available for webassembly.
Can anyone confirm this?

Best regards,
Michiel

SGaist

Hi and welcome to devnet,

You have the list of the currently supported module in this wiki page.

A quick look shows that currently neither QtLocation nor QtPosition are available.

michjans

Thanks,
I downloaded the qt source code and tried to build the qtlocation module manually using wasm_32. First I did:

qmake qtlocation.pro 

Running configuration tests...
Done running configuration tests.

Configure summary:

Qt Positioning:
  Gypsy GPS Daemon ....................... no
  WinRT Geolocation API .................. no
Qt Location:
  Qt.labs.location experimental QML plugin . yes
  Geoservice plugins:
    OpenStreetMap ........................ no
    HERE ................................. yes
    Esri ................................. yes
    Mapbox ............................... yes
    MapboxGL ............................. yes
    Itemsoverlay ......................... yes

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/BUILDS/workspace/Qt-5-14/5.14.1/wasm_32'.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

But when running make I get the error:

make
Some of the required modules (!wasm) are not available.
Skipped.

Does this mean that it is also not possible to manually build the qtlocation module for wasm_32?
Can I force it to build?

Best regards,
Michiel

lorn.potter

QtLocation and QtPositioning are not supported modules in Qt WebAssembly.

Mesrine

@lorn-potter
Any news if at least QtLocation will be supported in the near future for Qt for webassembly?

ProQtGuy

Any news if at least QtLocation will be supported in the near future for Qt for webassembly?

Ronel_qtmaster

@michjans QtLocation is actually not supported for webassembly.If you want to test the map on a browser you can try with WEBGL plugin

Mesrine

@Ronel_qtmaster

Could you explain a bit more about how to use a map in qt web assembly.

discipline

@Mesrine he meant using the QPA WebGL Plugin: https://github.com/qt/qtwebglplugin ; however it is not supported in Qt6. If you are willing to give that a try, let's share some notes.

I'm a new comer to this space and am trying to get a Map to display on the browser. So far I looked at the possible high levels avenues to be explored, note that these come from a naive and uneducated point of view:

Update QtPositioning and QtLocation for web assembly (unsure about the effort required)
Create a QtWebMaps modules with only the slippy map of QtLocation (unsure if this can be done license-wise)
Update the qtwebglplugin to Qt6 (unsure about the effort required or technical possibilities)

discipline

however it is not supported in Qt6

source

Mesrine

@discipline here I used Leaflet javascript to add a map, and the map communicates with the Qt app through normal wasm function bindings.
The repo is here

discipline

@Mesrine thanks for sharing! Awesome work there!

At this time I am more inclined to a single C++ codebase for a proof of concept which would target Web, Desktop and Mobile. However if it comes to it, I could end up with a separate solution for WASM inspired by what you have there.