material library

FlexibleSpaceBar class

The part of a material design AppBar that expands and collapses.

Most commonly used in in the SliverAppBar.flexibleSpace field, a flexible space bar expands and contracts as the app scrolls so that the AppBar reaches from the top of the app to the top of the scrolling contents of the app.

The widget that sizes the AppBar must wrap it in the widget returned by FlexibleSpaceBar.createSettings, to convey sizing information down to the FlexibleSpaceBar.

Constructors

FlexibleSpaceBar({Key key, Widget title, Widget background, bool centerTitle, CollapseMode collapseMode: CollapseMode.parallax }): Creates a flexible space bar. [...]
const

Properties

background → Widget: Shown behind the title when expanded. [...]
final
centerTitle → bool: Whether the title should be centered. [...]
final
collapseMode → CollapseMode: Collapse effect while scrolling. [...]
final
title → Widget: The primary contents of the flexible space bar when expanded. [...]
final
hashCode → int: The hash code for this object. [...]
read-only, inherited
key → Key: Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType → Type: A representation of the runtime type of the object.
read-only, inherited

Methods

createState() → _FlexibleSpaceBarState: Creates the mutable state for this widget at a given location in the tree. [...]
override
createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent 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 toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String: Returns a string representation of this object.
inherited
toStringDeep({String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug }) → 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 ==(dynamic other) → bool: The equality operator. [...]
inherited

Static Methods

createSettings({double toolbarOpacity, double minExtent, double maxExtent, double currentExtent, Widget child }) → Widget: Wraps a widget that contains an AppBar to convey sizing information down to the FlexibleSpaceBar. [...]