Universal Style

The Universal style allows customizing four attributes, theme, accent, foreground, and background.

Both attributes can be specified for any window or item, and they automatically propagate to children in the same manner as fonts. In the following example, the window and all three radio buttons appear in the dark theme using a violet accent color:

Sélectionnez import QtQuick 2.12 import QtQuick.Controls 2.12 import QtQuick.Controls.Universal 2.12 ApplicationWindow { visible: true Universal.theme: Universal.Dark Universal.accent: Universal.Violet Column { anchors.centerIn: parent RadioButton { text: qsTr("Small") } RadioButton { text: qsTr("Medium"); checked: true } RadioButton { text: qsTr("Large") } } }

In addition to specifying the attributes in QML, it is also possible to specify them via environment variables or in a configuration file. Attributes specified in QML take precedence over all other methods.

Configuration File▲

Environment Variables▲

The Universal style must be separately imported to gain access to the attributes that are specific to the Universal style. It should be noted that regardless of the references to the Universal style, the same application code runs with any other style. Universal-specific attributes only have an effect when the application is run with the Universal style.

If the Universal style is imported in a QML file that is always loaded, the Universal style must be deployed with the application in order to be able to run the application regardless of which style the application is run with. By using file selectors, style-specific tweaks can be applied without creating a hard dependency to a style.

Available pre-defined colors:

See also Basic Style, Material Style

This attached property holds the accent color of the theme. The property can be attached to any window or item. The value is propagated to children.

The default value is Universal.Cobalt.

In the following example, the accent color of the highlighted button is changed to Universal.Orange:

Sélectionnez Button { text: qsTr("Button") highlighted: true Universal.accent: Universal.Orange }

{universal-background-attached-prop}   This attached property holds the background color of the theme. The property can be attached to any window or item. The value is propagated to children.

The default value is theme-specific (light or dark).

In the following example, the background color of the pane is changed to Universal.Steel:

Sélectionnez Pane { Universal.background: Universal.Steel Button { text: qsTr("Button") } }

{universal-foreground-attached-prop}   This attached property holds the foreground color of the theme. The property can be attached to any window or item. The value is propagated to children.

The default value is theme-specific (light or dark).

In the following example, the foreground color of the button is set to Universal.Pink:

Sélectionnez Button { text: qsTr("Button") Universal.foreground: Universal.Pink }

{universal-theme-attached-prop}   This attached property holds whether the theme is light or dark. The property can be attached to any window or item. The value is propagated to children.

Available themes:

Setting the theme to System chooses either the light or dark theme based on the system theme colors. However, when reading the value of the theme property, the value is never System, but the actual theme.

In the following example, the theme for both the pane and the button is set to Universal.Dark:

Sélectionnez Pane { Universal.theme: Universal.Dark Button { text: qsTr("Button") } }

{color-attached-method}   This attached method returns the effective color value of the specified pre-defined Universal color.

Rectangle {
    color: Universal.color(Universal.Red)
}