SliverAnimatedOpacityModifier class
Animated version of SliverOpacity which automatically transitions the sliver child's opacity over a given duration whenever the given opacity changes.
Animating an opacity is relatively expensive because it requires painting the sliver child into an intermediate buffer.
Here's an illustration of what using this widget looks like, using a curve of Curves.fastOutSlowIn.
{@tool dartpad} Creates a CustomScrollView with a SliverFixedExtentList and a FloatingActionButton. Pressing the button animates the lists' opacity.
** See code in examples/api/lib/widgets/implicit_animations/sliver_animated_opacity.0.dart ** {@end-tool}
See also:
- SliverFadeTransition, an explicitly animated version of this widget, where an Animation is provided by the caller instead of being built in.
- AnimatedOpacity, for automatically transitioning a box child's opacity over a given duration whenever the given opacity changes.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatelessWidget
- SingleChildStatelessModifier
- SingleChildImplicitlyAnimatedModifier
- SliverAnimatedOpacityModifier
- Available extensions
Constructors
- SliverAnimatedOpacityModifier({Key? key, Widget? sliver, Curve curve = Curves.linear, required Duration duration, VoidCallback? onEnd, Key? modifierKey, required double opacity, bool alwaysIncludeSemantics = false})
-
Creates a widget that animates its opacity implicitly.
const
Properties
- alwaysIncludeSemantics → bool
-
Whether the semantic information of the children is always included.
final
- curve → Curve
-
The curve to apply when animating the parameters of this container.
finalinherited
- duration → Duration
-
The duration over which to animate the parameters of this container.
finalinherited
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- modifierKey → Key?
-
The actual key of the widget, which Modifier wrapped
finalinherited
- onEnd → VoidCallback?
-
Called every time an animation completes.
finalinherited
- opacity → double
-
The target opacity.
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.
inherited
-
buildWithChild(
BuildContext context, Widget? child) → Widget -
A build method that receives an extra
childparameter.override -
createElement(
) → SingleChildStatelessElement -
Create a SingleChildStatelessElement
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
-
modified(
) → Modifier -
Available on Widget, provided by the ModifierTransformer extension
Transform normal widget to Modifier -
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