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Qt Quick Controls 2 Configuration File

Qt Quick Controls 2 support a special configuration file, :/qtquickcontrols2.conf, that 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 Default style is used.

Material Section

The following Material style specific values can be specified 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".
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 Universal style specific values can be specified 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".

Using the Configuration File in a Project

In order to make it possible for Qt Quick Controls 2 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 2 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

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Licensed under the GNU Free Documentation License, Version 1.3.
https://doc.qt.io/qt-5.9/qtquickcontrols2-configuration.html