PrismTabs class

Tabs that adapt to the window instead of overflowing.

Below PrismTokens.breakpointCompact the tab strip scrolls horizontally and snaps the selected tab into view, because five labels do not fit on a phone and a TabBar that silently clips them is worse than one that scrolls. Above it the strip fills the width and the labels get equal space.

The strip is a proper tab list to assistive tech — each tab announces its position ("2 of 4") and selection state — and changing tabs moves focus to the new panel rather than leaving it stranded on the strip.

PrismTabs(
  tabs: const [
    PrismTab(label: 'Today', icon: Icons.today_outlined),
    PrismTab(label: 'Upcoming', icon: Icons.schedule_outlined),
  ],
  index: index,
  onChanged: (next) => setState(() => index = next),
  children: const [TodayView(), UpcomingView()],
)
Inheritance

Constructors

PrismTabs({Key? key, required List<PrismTab> tabs, required int index, required ValueChanged<int> onChanged, required List<Widget> children, double? scrollThreshold, bool keepAlive = false, String? semanticLabel})
Creates an adaptive tab view.
const

Properties

children → List<Widget>
The panel for each tab. Must be the same length as tabs.
final
hashCode → int
The hash code for this object.
no setterinherited
index → int
The selected tab.
final
keepAlive → bool
Whether to keep off-screen panels alive, preserving their state. Costs memory, so it is off by default.
final
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
onChanged → ValueChanged<int>
Called when a different tab is picked.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
scrollThreshold → double?
Width below which the strip scrolls. Defaults to PrismTokens.breakpointCompact.
final
semanticLabel → String?
Accessible name for the tab list.
final
tabs → List<PrismTab>
The tabs, left to right.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<PrismTabs>
Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String
A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String
Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String
Returns a one-line detailed description of the object.
inherited
toStringShort() → String
A short, textual description of this widget.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited