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  1. Qt
  2. QTBUG-122055

QML Singleton does not get instanciated when root .qml file is in the same subfolder

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    • Linux/X11, macOS

      Hello,
      I have a very strange case going on. Repro attached.

      Basically:

      qml/Style.qml: 

      pragma Singleton
import QtQuick

QtObject
 {
    readonly property int foo: 250
    Component.onCompleted: {
        console.log("hi from singleton")
    }
}

      qml/Main.qml: 

      import QtQuick
Window {
    visible: true
    Component.onCompleted: console.log(Style.foo)
}

      When I do this, I get "undefined" on the console, and I don't see "hi from singleton" showing up.

      To make it work, it is sufficient to move Main.qml one folder above. e.g. here are the three scenarios:

      Scenario A: fails
      qml/Main.qml
      qml/Style.qml

      Scenario B: works
      ./Main.qml
      qml/Style.qml

      Scenario C: works
      ./Main.qml
      ./Style.qml

      I believe that if Scenario B and C work, then scenario A not working is a bug.

      Bug originally experienced on macOS but reduced and reproduced on Linux.

      CMake for the record:

      cmake_minimum_required(VERSION 3.16)

project(singleton-bug VERSION 0.1 LANGUAGES CXX)

set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Qt6 6.5 REQUIRED COMPONENTS Quick)

qt_standard_project_setup(REQUIRES 6.5)

set_source_files_properties(qml/Style.qml PROPERTIES
    QT_QML_SINGLETON_TYPE TRUE
)
qt_add_executable(appsingleton-bug
    main.cpp
)

qt_add_qml_module(appsingleton-bug
    URI singleton-bug
    VERSION 1.0
    QML_FILES
        # Main.qml  # OK
        qml/Main.qml # Buggy
        qml/Style.qml
)

target_link_libraries(appsingleton-bug
    PRIVATE Qt6::Quick
)

        1. repro-bug-singleton.tar.gz
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            qtqmlteam Qt Qml Team User
            jcelerier Jean-Michaël Celerier
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              Created:
              Updated:
              Resolved:

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