InViewNotifierWidget class
The widget that gets notified if it is currently inside the viewport condition provided by the IsInViewPortCondition condition.
Performance optimizations
If your builder function contains a subtree that does not depend on the animation, it's more efficient to build that subtree once instead of rebuilding it on every animation tick.
If you pass the pre-built subtree as the child parameter, the AnimatedBuilder will pass it back to your builder function so that you can incorporate it into your build.
Using this pre-built child is entirely optional, but can improve performance significantly in some cases and is therefore a good practice.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- InViewNotifierWidget
Constructors
- InViewNotifierWidget({Key? key, required String id, required InViewNotifierWidgetBuilder builder, Widget? child})
-
const
Properties
- builder → InViewNotifierWidgetBuilder
-
The function that defines and returns the widget that should be notified
as inView.
final
- child → Widget?
-
The child widget to pass to the builder.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- id → String
-
a required String property. This should be unique for every widget
that wants to get notified.
final
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → _InViewNotifierWidgetState -
Creates the mutable state for this widget at a given location in the tree.
override
-
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}) → 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