Tabs

Switch between related sections inside one screen. A tabs control coordinates a tab_bar and tab_bar_view.

Example

tabs(
  length: 2,
  selected_index: 0,
  content: column(
    children: [
      tab_bar([
        tab(label: "Home", icon: "home"),
        tab(label: "Settings", icon: "settings")
      ]),
      container(
        height: 240,
        content: tab_bar_view([
          text("Home content"),
          text("Settings content")
        ])
      )
    ]
  ),
  on_change: ->(event) {
    page.update(status, value: "Selected tab: #{event.value}")
  }
)

Properties

• length — number of coordinated tabs and views.
• selected_index — initially selected tab index.
• content — layout containing the tab bar and tab views.
• animation_duration — tab transition duration.
• expand, width, and height — layout sizing.

Events

• on_change — fired after selection changes; read the selected index from event.value.

The number of tab controls in tab_bar should match the number of children in tab_bar_view and the length value.

Complete API

Helpers

• tabs(content = ..., **props, &block)

Accepted properties

• adaptive — Adapts to the platform (Material/Cupertino) when true.
• align — Alignment of the control within its parent.
• animate_align — Animates alignment changes.
• animate_margin — Animates margin changes.
• animate_offset — Animates offset changes.
• animate_opacity — Animates opacity changes.
• animate_position — Animates position changes.
• animate_rotation — Animates rotation changes.
• animate_scale — Animates scale changes.
• animate_size — Animates size changes.
• animation_duration — Sets the animation duration property.
• aspect_ratio — Width-to-height ratio to maintain.
• badge — Badge drawn on the corner of the control.
• bottom — Bottom offset when positioned inside a stack.
• col — Responsive column span (1-12) per breakpoint.
• content — The single child control rendered inside this control.
• data — Arbitrary value you can attach to the control and read back in handlers.
• disabled — Disables interaction when true.
• expand — Fills the available space along the parent's main axis when true.
• expand_loose — Like expand, but only grows up to the child's natural size.
• height — Fixed height in logical pixels.
• key — Stable identity used to preserve state across rebuilds.
• left — Left offset when positioned inside a stack.
• length — Sets the length property.
• margin — Outer spacing around the control.
• offset — Translation offset applied to the control.
• opacity — Opacity from 0.0 (transparent) to 1.0 (opaque).
• right — Right offset when positioned inside a stack.
• rotate — Rotation applied to the control.
• rtl — Renders right-to-left when true.
• scale — Scale transform applied to the control.
• selected_index — Sets the selected index property.
• size_change_interval — Throttle interval for on_size_change, in ms.
• tooltip — Text shown on hover/long-press.
• top — Top offset when positioned inside a stack.
• visible — Hides the control when false.
• width — Fixed width in logical pixels.

Events

• on_animation_end — Fired when an animation completes.
• on_change — Fired when the value changes.
• on_size_change — Fired when the control's size changes.

Wire reference

• Family: materials
• Widget type: tabs