BalloonTapDelegator class

BalloonTapDelegator resolves the issue where tap events are not handled when displaying a Balloon using PositionedBalloon.

When a Balloon is displayed over a child element using PositionedBalloon, events that need to be handled within the Balloon (e.g., button presses) may not be processed due to the limited area of the child element.

By wrapping a parent widget that has a larger hit test area than PositionedBalloon.child with the BalloonTapDelegator widget, you can forward tap events from that area into the Balloon, allowing them to be handled appropriately.

BalloonTapDelegator( // Place this widget at a level with a larger size than `Balloon.child`
  child: Scaffold( // in this case, the Scaffold widget has a larger size than the `FloatingActionButton` which is `PositionedBalloon.child`
    floatingActionButton: PositionedBalloon(
      show: isVisible,
      balloon: Balloon(
        child: Button(
          label: 'Close',
          onTap: () {
            setState(() => isVisible = false);
          })),
      child: FloatingActionButton(onPressed: () {
        setState(() => isVisible = !isVisible);
      }))));

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatelessWidget
• BalloonTapDelegator

Constructors

BalloonTapDelegator({Key? key, required Widget child})

const

Properties

child → Widget

final

hashCode → int

The hash code for this object.

no setter, inherited

key → Key?

Controls how one widget replaces another widget in the tree.

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, 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.

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