OnScrollBuilder class Null safety

Listen to an InjectedScrolling state.

The builder method is invoked when scrolling start, while scrolling and when scrolling ends.

  OnScrollBuilder(
    listenTo: scroll,
    builder: (scroll) {
      if (scroll.hasReachedMinExtent) {
        return Text('isTop');
      }

      if (scroll.hasReachedMaxExtent) {
        return Text('isBottom');
      }

      if (scroll.hasStartedScrollingReverse) {
        return Text('hasStartedUp');
      }
      if (scroll.hasStartedScrollingForward) {
        return Text('hasStartedDown');
      }

      if (scroll.hasStartedScrolling) {
        return Text('hasStarted');
      }

      if (scroll.isScrollingReverse) {
        return Text('isScrollingUp');
      }
      if (scroll.isScrollingForward) {
        return Text('isScrollingDown');
      }

      if (scroll.isScrolling) {
        return Text('isScrolling');
      }

      if (scroll.hasEndedScrolling) {
        return Text('hasEnded');
      }
      return Text('NAN');
    },
  ),
Inheritance

Constructors

OnScrollBuilder({Key? key, required InjectedScrolling listenTo, required Widget builder(InjectedScrolling)})
const

Properties

builder Widget Function(InjectedScrolling)
The builder method is invoked when scrolling start, while scrolling and when scrolling ends. [...]
final
hashCode int
The hash code for this object. [...]
@nonVirtual, read-only, inherited
key Key?
Controls how one widget replaces another widget in the tree. [...]
final, inherited
listenTo InjectedScrolling
InjectedScrolling to listen to.
final
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

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. [...]
@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 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. [...]
@nonVirtual, inherited