TabBar

Inherits: LayoutControl, AdaptiveControl

Used for navigating frequently accessed, distinct content categories. Tabs allow for navigation between two or more content views and relies on text headers to articulate the different sections of content.

Properties

• divider_color(ColorValue | None) –

  The color of the divider.

• divider_height(Number | None) –

  The height of the divider.

• enable_feedback(bool | None) –

  Whether detected gestures should provide acoustic and/or haptic feedback.

• indicator(UnderlineTabIndicator | None) –

  Defines the appearance of the selected tab indicator.

• indicator_animation(TabIndicatorAnimation | None) –

  Specifies the animation behavior of the tab indicator.

• indicator_color(ColorValue | None) –

  The color of the indicator(line that appears below the selected tab).

• indicator_size(TabBarIndicatorSize | None) –

  Defines how the selected tab indicator's size is computed.

• indicator_thickness(Number) –

  The thickness of the indicator. Value must be greater than zero.

• label_color(ColorValue | None) –

  The color of selected tab labels.

• label_padding(PaddingValue | None) –

  The padding around the tab label.

• label_text_style(TextStyle | None) –

  The text style of the tab labels.

• mouse_cursor(MouseCursor | None) –

  The cursor to be displayed when a mouse pointer enters or is hovering over this

• overlay_color(ControlStateValue[ColorValue] | None) –

  Defines the ink response focus, hover, and splash

• padding(PaddingValue | None) –

  The padding around the Tabs control.

• scrollable(bool) –

  Whether this tab bar can be scrolled horizontally.

• secondary(bool) –

  Whether to create a secondary/nested tab bar.

• splash_border_radius(BorderRadiusValue | None) –

  Defines the clipping radius of splashes that extend outside the bounds of the tab.

• tab_alignment(TabAlignment | None) –

  Specifies the horizontal alignment of the tabs within this tab bar.

• tabs(list[Control]) –

  A list of controls.

• unselected_label_color(ColorValue | None) –

  The color of unselected tab labels.

• unselected_label_text_style(TextStyle | None) –

  The text style of the unselected tab labels.

Events

• on_click(ControlEventHandler[TabBar] | None) –

  Called when a tab is clicked.

• on_hover(EventHandler[TabBarHoverEvent] | None) –

  Called when a tab's (from tabs) hover state in the

Properties

divider_color

divider_color: ColorValue | None = None

The color of the divider.

divider_height

divider_height: Number | None = None

The height of the divider.

If None, defaults to TabBarTheme.divider_height. If this is also None, 1.0 will be used.

enable_feedback

enable_feedback: bool | None = None

Whether detected gestures should provide acoustic and/or haptic feedback.

On Android, for example, setting this to True produce a click sound and a long-press will produce a short vibration.

Defaults to True.

indicator

indicator: UnderlineTabIndicator | None = None

Defines the appearance of the selected tab indicator.

If this or TabBarTheme.indicator is not None, indicator_color and indicator_thickness properties are ignored.

The indicator's size is based on the tab's bounds. If indicator_size is TabBarIndicatorSize.TAB, the tab's bounds are as wide as the space occupied by the tab in the tab bar. If indicator_size is TabBarIndicatorSize.LABEL, then the tab's bounds are only as wide as the tab control itself.

indicator_animation

indicator_animation: TabIndicatorAnimation | None = None

Specifies the animation behavior of the tab indicator.

If this is None, then the value of TabBarTheme.indicator_animation is used. If that is also None, then the tab indicator will animate linearly if the indicator_size is TabBarIndicatorSize.TAB, otherwise it will animate with an elastic effect if the indicator_size is TabBarIndicatorSize.LABEL.

indicator_color

indicator_color: ColorValue | None = None

The color of the indicator(line that appears below the selected tab).

Note

Will be ignored if indicator or TabBarTheme.indicator is not None.

indicator_size

indicator_size: TabBarIndicatorSize | None = None

Defines how the selected tab indicator's size is computed.

The size of the selected tab indicator is defined relative to the tab's overall bounds if indicator_size is TabBarIndicatorSize.TAB (the default) or relative to the bounds of the tab's control if indicator_size is TabBarIndicatorSize.LABEL.

The selected tab's location appearance can be refined further with the indicator_color, indicator_thickness, and indicator properties.

indicator_thickness

indicator_thickness: Number = 2.0

The thickness of the indicator. Value must be greater than zero.

Note

Will be ignored if indicator or TabBarTheme.indicator is not None.

Raises:

• ValueError –

  If indicator is None and indicator_thickness is not strictly greater than 0.

label_color

label_color: ColorValue | None = None

The color of selected tab labels.

label_padding

label_padding: PaddingValue | None = None

The padding around the tab label.

label_text_style

label_text_style: TextStyle | None = None

The text style of the tab labels.

mouse_cursor

mouse_cursor: MouseCursor | None = None

The cursor to be displayed when a mouse pointer enters or is hovering over this control.

overlay_color

overlay_color: ControlStateValue[ColorValue] | None = None

Defines the ink response focus, hover, and splash colors in various ControlState states.

The following states are supported: ControlState.PRESSED, ControlState.HOVERED and ControlState.FOCUSED.

padding

padding: PaddingValue | None = None

The padding around the Tabs control.

scrollable

scrollable: bool = True

Whether this tab bar can be scrolled horizontally.

If True, then each tab is as wide as needed for its label and the entire tab bar is scrollable. Otherwise each tab gets an equal share of the available space.

secondary

secondary: bool = False

Whether to create a secondary/nested tab bar.

Secondary tabs are used within a content area to further separate related content and establish hierarchy.

splash_border_radius

splash_border_radius: BorderRadiusValue | None = None

Defines the clipping radius of splashes that extend outside the bounds of the tab.

tab_alignment

tab_alignment: TabAlignment | None = None

Specifies the horizontal alignment of the tabs within this tab bar.

If this is None, then the value of TabBarTheme.tab_alignment is used. If TabBarTheme.tab_alignment is None and Theme.use_material3 is True, then TabAlignment.START_OFFSET is used if scrollable is True, otherwise TabAlignment.FILL is used.

If TabBarTheme.tab_alignment is None and Theme.use_material3 is False, then TabAlignment.CENTER is used if scrollable is True, otherwise TabAlignment.FILL is used.

Note

• If scrollable is False, then tab_alignment must be either TabAlignment.FILL or TabAlignment.CENTER.
• If scrollable is True, then tab_alignment must be TabAlignment.START, TabAlignment.START_OFFSET or TabAlignment.CENTER.

Raises:

• ValueError –

  If it is not valid for the current scrollable configuration.

tabs

tabs: list[Control]

A list of controls.

Typically Tabs.

unselected_label_color

unselected_label_color: ColorValue | None = None

The color of unselected tab labels.

unselected_label_text_style

unselected_label_text_style: TextStyle | None = None

The text style of the unselected tab labels.

Events

on_click

on_click: ControlEventHandler[TabBar] | None = None

Called when a tab is clicked.

The data property of the event handler argument contains the index of the clicked tab.

on_hover

on_hover: EventHandler[TabBarHoverEvent] | None = None

Called when a tab's (from tabs) hover state in the tab bar changes.

When hover is moved from one tab directly to another, this will be called twice. First to represent hover exiting the initial tab, and then second for the pointer entering hover over the next tab.