Reference error when accessing a QML singleton component

shamaoke

Hi.

I'm creating a project with a singleton qml subcomponent.

pragma Singleton

import QtQuick

QtObject {

  property int windowWidth: 1280
  property int windowHeight: 720

  property string windowTitle: "SamplePlayer"
}

link

This component should then be imported in the main QML component under the Styles namespace with the Style name.

import QtQuick

  ...

import Styles

Window {

  width: Style.windowWidth
  height: Style.windowHeight

  title: Style.windowTitle

  ...

}

link

I defined the qml subcomponent as a qml module in the build control file.

set_source_files_properties(Style.qml PROPERTIES QT_QML_SINGLETON_TYPE TRUE)

...

qt_add_qml_module(
  styles
  VERSION 1.0
  URI Styles
  RESOURCE_PREFIX "/"
  PLUGIN_TARGET styles_plugin
  OUTPUT_DIRECTORY Styles
  QML_FILES
    Style.qml
  STATIC
)

link

And linked the main executable against this module.

target_link_libraries(
  sample_media_player

  PRIVATE
    ...

    styles_plugin
)

link

When I build and execute the program, the style properties defined in the qml subcomponent isn't applied. I get the following error messages in the console.

qrc:/Components/Main.qml:19: ReferenceError: Style is not defined
qrc:/Components/Main.qml:17: ReferenceError: Style is not defined
qrc:/Components/Main.qml:16: ReferenceError: Style is not defined

What's the reason of these errors? Why the properties defined in the qml singleton component isn't applied?

Thanks.

Project link

sample_media_player

Building environments

Arch, CMake 3.29.3, Ninja 1.12.1, GCC 14.1.1, Qt 6.7.0

Debian 12.5, CMake 3.25, Ninja 1.11.1, GCC 12.2.0, Qt 6.4.2