BankSliverAppBar class

The BankAppBar title hierarchy as a sliver, with the collapsing large-title pattern.

In BankAppBarTitleMode.collapsing (the default here) the bar opens with the large title anchored to its bottom edge and, as content scrolls under it, the large title scales down and fades out while a compact centred title fades into the toolbar row. Exactly one of the two is in the semantics tree at a time, so the heading is announced once.

CustomScrollView(
  slivers: [
    BankSliverAppBar(title: 'Accounts', subtitle: 'Sara Ahmed'),
    SliverList.list(children: accountTiles),
  ],
)

Pass titleMode to opt out: BankAppBarTitleMode.standard gives a plain pinned bar, and BankAppBarTitleMode.large keeps the large title without the hand-off, so it simply scrolls away.

Inheritance

Constructors

BankSliverAppBar({Key? key, String? title, String? subtitle, Widget? leading, bool automaticallyImplyLeading = true, List<Widget>? actions, Color? backgroundColor, Color? foregroundColor, bool? centerTitle, PreferredSizeWidget? bottom, TextStyle? titleStyle, TextStyle? subtitleStyle, TextStyle? collapsedTitleStyle, double? elevation, Color? shadowColor, double? toolbarHeight, BankAppBarTitleMode titleMode = BankAppBarTitleMode.collapsing, double? largeTitleHeight, double? expandedHeight, bool pinned = true, bool floating = false, bool snap = false, bool stretch = false})
const

Properties

actions → List<Widget>?
Trailing actions of the toolbar row. They stay in the toolbar at every collapse position, so they never travel with the large title.
final
automaticallyImplyLeading → bool
Whether to imply a leading back button when leading is null.
final
backgroundColor → Color?
Overrides BankThemeData.surface as the background colour.
final
bottom → PreferredSizeWidget?
Optional tab bar or search bar attached below the toolbar. It stays pinned with the toolbar, so the large title is inset above it.
final
centerTitle → bool?
Alignment of the compact toolbar title. Defaults to true in BankAppBarTitleMode.collapsing — the large title hands off to a centred compact title — and false otherwise.
final
collapsedTitleStyle → TextStyle?
Merged over the computed collapsed-title style (BankTokens.headlineSmall at w700).
final
elevation → double?
Overrides BankThemeData.elevationLow as the bar elevation.
final
expandedHeight → double?
Overrides the fully-expanded bar height. Defaults to the toolbar, the large-title tier, and bottom stacked.
final
floating → bool
Whether the bar reappears as soon as the user scrolls back up, rather than only at the top of the list.
final
foregroundColor → Color?
Overrides BankThemeData.onSurface as the foreground colour.
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
largeTitleHeight → double?
Overrides the height of the large-title tier. See BankAppBar.largeTitleHeight.
final
leading → Widget?
Leading action of the toolbar row.
final
pinned → bool
Whether the collapsed toolbar stays on screen. Defaults to true: a collapsing large title needs somewhere to land.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
shadowColor → Color?
Overrides BankThemeData.outline as the elevation shadow colour.
final
snap → bool
Whether a floating bar snaps fully open or closed when the scroll ends.
final
stretch → bool
Whether the bar stretches past its expanded height on overscroll.
final
subtitle → String?
Optional supporting line rendered below title while expanded.
final
subtitleStyle → TextStyle?
Merged over the computed subtitle style.
final
title → String?
Primary app-bar heading.
final
titleMode → BankAppBarTitleMode
How the title block is sized and placed. Defaults to BankAppBarTitleMode.collapsing.
final
titleStyle → TextStyle?
Merged over the computed expanded-title style.
final
toolbarHeight → double?
Overrides kToolbarHeight as the collapsed toolbar height.
final

Methods

build(BuildContext context) → Widget
Describes the part of the user interface represented by this widget.
override
createElement() → StatelessElement
Creates a StatelessElement to manage this widget's location in the tree.
inherited
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