GlowingOverscrollIndicator class Null safety

A visual indication that a scroll view has overscrolled.

A GlowingOverscrollIndicator listens for ScrollNotifications in order to control the overscroll indication. These notifications are typically generated by a ScrollView, such as a ListView or a GridView.

GlowingOverscrollIndicator generates OverscrollIndicatorNotification before showing an overscroll indication. To prevent the indicator from showing the indication, call OverscrollIndicatorNotification.disallowGlow on the notification.

Created automatically by ScrollBehavior.buildOverscrollIndicator on platforms (e.g., Android) that commonly use this type of overscroll indication.

In a MaterialApp, the edge glow color is the overall theme's ColorScheme.secondary color.

Customizing the Glow Position for Advanced Scroll Views

When building a CustomScrollView with a GlowingOverscrollIndicator, the indicator will apply to the entire scrollable area, regardless of what slivers the CustomScrollView contains.

For example, if your CustomScrollView contains a SliverAppBar in the first position, the GlowingOverscrollIndicator will overlay the SliverAppBar. To manipulate the position of the GlowingOverscrollIndicator in this case, you can either make use of a NotificationListener and provide a OverscrollIndicatorNotification.paintOffset to the notification, or use a NestedScrollView.

This example demonstrates how to use a NotificationListener to manipulate the placement of a GlowingOverscrollIndicator when building a CustomScrollView. Drag the scrollable to see the bounds of the overscroll indicator.
To create a local project with this code sample, run:
flutter create --sample=widgets.GlowingOverscrollIndicator.1 mysample

This example demonstrates how to use a NestedScrollView to manipulate the placement of a GlowingOverscrollIndicator when building a CustomScrollView. Drag the scrollable to see the bounds of the overscroll indicator.
To create a local project with this code sample, run:
flutter create --sample=widgets.GlowingOverscrollIndicator.2 mysample

See also:

Inheritance

Constructors

GlowingOverscrollIndicator({Key? key, bool showLeading, bool showTrailing, required AxisDirection axisDirection, required Color color, ScrollNotificationPredicate notificationPredicate, Widget? child})
Creates a visual indication that a scroll view has overscrolled. [...]
const

Properties

axis Axis
The axis along which scrolling occurs in the Scrollable whose overscrolls are to be visualized.
read-only
axisDirection AxisDirection
The direction of positive scroll offsets in the Scrollable whose overscrolls are to be visualized.
final
child Widget?
The widget below this widget in the tree. [...]
final
color Color
The color of the glow. The alpha channel is ignored.
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
notificationPredicate ScrollNotificationPredicate
A check that specifies whether a ScrollNotification should be handled by this widget. [...]
final
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
showLeading bool
Whether to show the overscroll glow on the side with negative scroll offsets. [...]
final
showTrailing bool
Whether to show the overscroll glow on the side with positive scroll offsets. [...]
final

Methods

createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree. [...]
inherited
createState() → _GlowingOverscrollIndicatorState
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. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
override
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