StreamToolbar class

Three-slot horizontal layout shared by StreamAppBar, StreamBottomAppBar, and StreamSheetHeader.

Lays out an optional leading / trailing flush against the bar's start and end edges (after padding) and an optional middle centred in the bar's full width — so an asymmetric leading and trailing don't shift the title off-centre. The middle is constrained to the symmetric space reserved between the side slots so it never overlaps either of them.

Each slot is vertically centred inside the available content height. The toolbar takes its size from the parent's tight height constraint — callers are responsible for sitting in a fixed-height slot (e.g. via PreferredSize or a SizedBox using kStreamToolbarHeight).

padding is the bar-edge padding around all three slots; spacing is the minimum gap reserved between the middle and either side slot.

Inheritance

Constructors

StreamToolbar({Key? key, Widget? leading, Widget? middle, Widget? trailing, EdgeInsetsGeometry padding = EdgeInsets.zero, double spacing = 0})
Creates a toolbar layout with the given slots.
const

Properties

hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
leading → Widget?
The widget anchored at the start edge.
final
middle → Widget?
The widget centred in the bar's full inner width.
final
padding → EdgeInsetsGeometry
Padding applied around all three slots.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
spacing → double
Minimum gap reserved between the middle slot and either side slot.
final
trailing → Widget?
The widget anchored at the end edge.
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