Qt 5.9 | Qt Quick Controls 2 | Material Style

Qt 5.9.9 Reference Documentation

# Material Style

The Material Style is based on the Google Material Design Guidelines. More...

Import Statement: | import QtQuick.Controls.Material 2.2
Since: | Qt 5.7

## Attached Properties

- accent : color
- background : color
- elevation : int
- foreground : color
- primary : color
- theme : enumeration

## Attached Methods

- color color(enumeration predefined, enumeration shade)

## Detailed Description

The Material style is based on the Google Material Design Guidelines. It allows for a unified experience across platforms and device sizes.

The Material style in light theme | The Material style in dark theme

To run an application with the Material style, see Using Styles in Qt Quick Controls 2.

Note: The Material style is not a native Android style. The Material style is a 100% cross-platform Qt Quick Controls 2 style implementation that follows the Google Material Design Guidelines. The style runs on any platform, and looks more or less identical everywhere. Minor differences may occur due to differences in available system fonts and font rendering engines.

### Customization

The Material style allows customizing five attributes, theme, primary, accent, foreground, and background.

All 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 purple accent color:

      import QtQuick 2.0
      import QtQuick.Controls 2.1
      import QtQuick.Controls.Material 2.1

      ApplicationWindow {
          visible: true

          Material.theme: Material.Dark
          Material.accent: Material.Purple

          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

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"`.

See Qt Quick Controls 2 Configuration File for more details about the configuration file.

#### Environment Variables

Variable | Description
--- | ---
`QT_QUICK_CONTROLS_MATERIAL_THEME` | Specifies the default Material theme. The value can be one of the available themes, for example `"Dark"`.
`QT_QUICK_CONTROLS_MATERIAL_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"`.
`QT_QUICK_CONTROLS_MATERIAL_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"`.
`QT_QUICK_CONTROLS_MATERIAL_FOREGROUND` | Specifies the default Material foreground color. The value can be any color, or one of the pre-defined Material colors, for example `"Brown"`.
`QT_QUICK_CONTROLS_MATERIAL_BACKGROUND` | Specifies the default Material background color. The value can be any color, or one of the pre-defined Material colors, for example `"Grey"`.

See Supported Environment Variables in Qt Quick Controls 2 for the full list of supported environment variables.

### Dependency

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

If the Material style is imported in a QML file that is always loaded, the Material 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.

### Pre-defined Material Colors

Even though primary and accent can be any color, it is recommended to use one of the pre-defined colors that have been designed to work well with the rest of the Material style palette:

Available pre-defined colors:

Constant | Description
--- | ---
`Material.Red` | #F44336
`Material.Pink` | #E91E63 (default accent)
`Material.Purple` | #9C27B0
`Material.DeepPurple` | #673AB7
`Material.Indigo` | #3F51B5 (default primary)
`Material.Blue` | #2196F3
`Material.LightBlue` | #03A9F4
`Material.Cyan` | #00BCD4
`Material.Teal` | #009688
`Material.Green` | #4CAF50
`Material.LightGreen` | #8BC34A
`Material.Lime` | #CDDC39
`Material.Yellow` | #FFEB3B
`Material.Amber` | #FFC107
`Material.Orange` | #FF9800
`Material.DeepOrange` | #FF5722
`Material.Brown` | #795548
`Material.Grey` | #9E9E9E
`Material.BlueGrey` | #607D8B

When the dark theme is in use, different shades of the pre-defined colors are used by default:

Constant | Description
--- | ---
`Material.Red` | #EF9A9A
`Material.Pink` | #F48FB1 (default accent)
`Material.Purple` | #CE93D8
`Material.DeepPurple` | #B39DDB
`Material.Indigo` | #9FA8DA (default primary)
`Material.Blue` | #90CAF9
`Material.LightBlue` | #81D4FA
`Material.Cyan` | #80DEEA
`Material.Teal` | #80CBC4
`Material.Green` | #A5D6A7
`Material.LightGreen` | #C5E1A5
`Material.Lime` | #E6EE9C
`Material.Yellow` | #FFF59D
`Material.Amber` | #FFE082
`Material.Orange` | #FFCC80
`Material.DeepOrange` | #FFAB91
`Material.Brown` | #BCAAA4
`Material.Grey` | #EEEEEE
`Material.BlueGrey` | #B0BEC5

### Pre-defined Shades

There are several different shades of each pre-defined color that can be passed to the Material.color() function:

Constant | Value
--- | ---
`Material.Shade50`
`Material.Shade100`
`Material.Shade200`
`Material.Shade300`
`Material.Shade400`
`Material.Shade500`
`Material.Shade600`
`Material.Shade700`
`Material.Shade800`
`Material.Shade900`
`Material.ShadeA100`
`Material.ShadeA200`
`Material.ShadeA400`
`Material.ShadeA700`

See also Default Style, Universal Style

## Attached Property Documentation

Material.accent : color

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 `Material.Pink`.

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

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

Note: Even though the accent can be any color, it is recommended to use one of the pre-defined Material colors that have been designed to work well with the rest of the Material style palette.

Material.background : color

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 button is changed to `Material.Teal`:

      Button {
          text: qsTr("Button")
          highlighted: true
          Material.background: Material.Teal
      }

Material.elevation : int

This attached property holds the elevation of the control. The higher the elevation, the deeper the shadow. The property can be attached to any control, but not all controls visualize elevation.

The default value is control-specific.

In the following example, the elevation of the pane is set to `6` in order to achieve the look of an elevated card:

      Pane {
          width: 120
          height: 120

          Material.elevation: 6

          Label {
              text: qsTr("I'm a card!")
              anchors.centerIn: parent
          }
      }

Material.foreground : color

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 `Material.Pink`:

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

Material.primary : color

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

The primary color is used as the background color of ToolBar by default.

The default value is `Material.Indigo`.

Note: Even though the primary can be any color, it is recommended to use one of the pre-defined Material colors that have been designed to work well with the rest of the Material style palette.

Material.theme : enumeration

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:

Constant | Description
--- | ---
`Material.Light` | Light theme (default)
`Material.Dark` | Dark theme
`Material.System` | System theme

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 `Material.Dark`:

      Pane {
          Material.theme: Material.Dark

          Button {
              text: qsTr("Button")
          }
      }

## Attached Method Documentation

color color(enumeration predefined, enumeration shade)

This attached method returns the effective color value of the specified pre-defined Material color combined with the given shade. If omitted, the shade argument defaults to `Material.Shade500`.

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

## Related Information

- Styling Qt Quick Controls 2