SliverPersistentHeader class
A sliver whose size varies when the sliver is scrolled to the edge of the viewport opposite the sliver's GrowthDirection.
In the normal case of a CustomScrollView with no centered sliver, this sliver will vary its size when scrolled to the leading edge of the viewport.
This is the layout primitive that SliverAppBar uses for its shrinking/growing effect.
To learn more about slivers, see CustomScrollView.slivers.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- SliverPersistentHeader
Constructors
- SliverPersistentHeader({Key? key, required SliverPersistentHeaderDelegate delegate, bool pinned = false, bool floating = false})
-
Creates a sliver that varies its size when it is scrolled to the start of
a viewport.
const
Properties
- delegate → SliverPersistentHeaderDelegate
-
Configuration for the sliver's layout.
final
- floating → bool
-
Whether the header should immediately grow again if the user reverses
scroll direction.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- pinned → bool
-
Whether to stick the header to the start of the viewport once it has
reached its minimum size.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
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.
override
-
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}) → 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