Qt Quick Controls Configuration File

Qt Quick Controls support a special configuration file, qtquickcontrols2.conf, which is built into an application's resources.

The configuration file can specify the preferred style and certain style-specific attributes. The following example specifies that the preferred style is the Material style. Furthermore, when the application is run with the Material style, its theme is light and the accent and primary colors are teal and blue grey, respectively. However, if the application is run with the Universal style instead, the accent color is red and the appropriate theme is chosen based on the system theme colors.

[Controls]
Style=Material

[Universal]
Theme=System
Accent=Red

[Material]
Theme=Light
Accent=Teal
Primary=BlueGrey

It is possible to specify a custom location for the configuration file with the QT_QUICK_CONTROLS_CONF environment variable.

Controls Section

The following values can be specified in a Controls section of the configuration file:

Variable Description
Style Specifies the style to run the application with. The value can be the name of one of the built-in styles or a custom style.
FallbackStyle Specifies the style to use for controls that are not implemented. The style must be one of the built-in styles. By default, the Basic style is used.

Imagine Section

The following table lists values that can be used to configure the Imagine style in an Imagine section of the configuration file:

Variable Description
Path Specifies the path to the directory that contains the Imagine style assets. If not specified, the built-in assets are used.

For example, to specify a path to a directory stored in the resource system:

[Imagine]
Path=:/imagine-assets

To specify a relative path to a local directory:

[Imagine]
Path=imagine-assets

Note: Due to a technical limitation, the path should not be named "imagine" if it is relative to the qtquickcontrols2.conf file.

Material Section

The following table lists values that can be used to configure the Material style in a Material section of the configuration file:

Variable Description
Theme Specifies the default Material theme. The value can be one of the available themes, for example "Dark".
Variant Specifies the Material variant. The Material Design has two variants: a normal variant designed for touch devices, and a dense variant for desktop. The dense variant uses smaller sizes for controls and their fonts.

The value can be "Normal" or "Dense".
Accent Specifies the default Material accent color. The value can be any color, but it is recommended to use one of the pre-defined Material colors, for example "Teal".
Primary Specifies the default Material primary color. The value can be any color, but it is recommended to use one of the pre-defined Material colors, for example "BlueGrey".
Foreground Specifies the default Material foreground color. The value can be any color, or one of the pre-defined Material colors, for example "Brown".
Background Specifies the default Material background color. The value can be any color, or one of the pre-defined Material colors, for example "Grey".

Universal Section

The following table lists values that can be used to configure the Universal style in a Universal section of the configuration file:

Variable Description
Theme Specifies the default Universal theme. The value can be one of the available themes, for example "Dark".
Accent Specifies the default Universal accent color. The value can be any color, but it is recommended to use one of the pre-defined Universal colors, for example "Violet".
Foreground Specifies the default Universal foreground color. The value can be any color, or one of the pre-defined Universal colors, for example "Brown".
Background Specifies the default Universal background color. The value can be any color, or one of the pre-defined Universal colors, for example "Steel".

Font Configuration

The default font can be specified in a Font sub-group in each style's section in the configuration file. The Font sub-group can be defined in two alternative ways:

[Basic]
Font\Family=Open Sans
Font\PixelSize=20

[Material\Font]
Family=Open Sans
PixelSize=20

Supported font attributes:

Variable Description
Family The font family.
PointSize The point size.
PixelSize The pixel size.
StyleHint The style hint. Available values: SansSerif, Helvetica, Serif, Times, TypeWriter, Courier, OldEnglish, Decorative, Monospace, Fantasy, Cursive.
Weight The weight. Qt uses a weighting scale from 1 to 1000 compatible with OpenType. A weight of 1 will be thin, whilst 1000 will be extremely black. Available pre-defined weights: Thin (100), ExtraLight (200), Light (300), Normal (400), Medium (500), DemiBold (600), Bold (700), ExtraBold (800), Black (900).
Style The style. Available values: StyleNormal, StyleItalic, StyleOblique.

Palette Configuration

The default palette can be configured for each style using the Palette sub-group in the configuration file. The Palette sub-group can be defined in two alternative ways:

[Fusion]
Palette\Window=#dedede
Palette\WindowText=#212121

or:

[Fusion\Palette]
Window=#dedede
WindowText=#212121

See Palette QML type for more information.

Using the Configuration File in a Project

In order to make it possible for Qt Quick Controls to find the configuration file, it must be built into application's resources using the The Qt Resource System. Here's an example .qrc file:

<!DOCTYPE RCC><RCC version="1.0">
<qresource prefix="/">
    <file>qtquickcontrols2.conf</file>
</qresource>
</RCC>

Note: Qt Quick Controls uses a file selector to load the configuration file. It is possible to provide a different configuration file for different platforms and locales. See QFileSelector documentation for more details.

Finally, the .qrc file must be listed in the application's .pro file so that the build system knows about it. For example:

RESOURCES = application.qrc

© The Qt Company Ltd
Licensed under the GNU Free Documentation License, Version 1.3.
https://doc.qt.io/qt-6.0/qtquickcontrols2-configuration.html