DevToolsScrollToTop class

Adds a small "scroll to top" button, shown once the user scrolls down, over the scrollable that builder returns.

Use it in a custom tab so long lists behave like the built-in ones.

Example:

DevToolsScrollToTop(
  scrollbar: true,
  builder: (context, controller) => ListView.builder(
    controller: controller,
    itemCount: items.length,
    itemBuilder: (context, index) => Text(items[index]),
  ),
)
Inheritance

Constructors

DevToolsScrollToTop({Key? key, required Widget builder(BuildContext context, ScrollController controller), void onScroll(double offset, ScrollDirection direction)?, bool scrollbar = false})
Creates the button over the scrollable built by builder.
const

Properties

builder → Widget Function(BuildContext context, ScrollController controller)
Builds the scrollable; it must attach the given ScrollController, or the button never shows.
final
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
onScroll → void Function(double offset, ScrollDirection direction)?
Called on every scroll with the offset and direction, e.g. to collapse a header while scrolling down.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
scrollbar → bool
Adds an easy-to-grab scrollbar along the right edge, for long lists where flicking alone is slow.
final

Methods

createElement() → StatefulElement
Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<DevToolsScrollToTop>
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, 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