SliverResizingHeader class
A sliver that is pinned to the start of its CustomScrollView and reacts to scrolling by resizing between the intrinsic sizes of its min and max extent prototypes.
The minimum and maximum sizes of this sliver are defined by minExtentPrototype and maxExtentPrototype, a pair of widgets that are laid out once. You can use SizedBox widgets to define the size limits.
If the minExtentPrototype is null, then the default minimum extent is 0. If maxExtentPrototype is null then the default maximum extent is based on the child's intrisic size.
This sliver is preferable to the general purpose SliverPersistentHeader for its relatively narrow use case because there's no need to create a SliverPersistentHeaderDelegate or to predict the header's minimum or maximum size.
To create a local project with this code sample, run:
flutter create --sample=widgets.SliverResizingHeader.1 mysample
See also:
- PinnedHeaderSliver - which just pins the header at the top of the CustomScrollView.
- SliverFloatingHeader - which animates the header in and out of view in response to downward and upwards scrolls.
- SliverPersistentHeader - a general purpose header that can be configured as a pinned, resizing, or floating header.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- SliverResizingHeader
Constructors
- SliverResizingHeader({Key? key, Widget? minExtentPrototype, Widget? maxExtentPrototype, Widget? child})
-
Create a pinned header sliver that reacts to scrolling by resizing between
the intrinsic sizes of the min and max extent prototypes.
const
Properties
- child → Widget?
-
The widget contained by this sliver.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- maxExtentPrototype → Widget?
-
Laid out once to define the maximum size of this sliver along the
CustomScrollView.scrollDirection axis.
final
- minExtentPrototype → Widget?
-
Laid out once to define the minimum size of this sliver along the
CustomScrollView.scrollDirection axis.
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.
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