StreamTapTargetPadding class

A widget that enlarges the tap target around its child to at least minSize, without changing the child's own size, position, or visual appearance.

The layout box expands to at least minSize, the child is placed inside that box according to alignment, and any hit inside the padded area is redirected to the child so tapping the "empty" padding still triggers the child's gesture handlers.

This is useful for small controls whose visible footprint is below the accessibility minimum tap target (for example, a 20x20 remove badge overlaid on an attachment tile) but whose tap area should still meet the recommended 48x48 dp minimum from Material Design and WCAG 2.5.5.

The child keeps its own size and paint bounds. Only the parent's layout size and hit-test area grow. Ink splashes, borders, and decorations drawn by the child are not affected.

{@tool snippet}

Expand a 20x20 badge's tap target to 48x48 while keeping the badge visually anchored to the top-end corner:

StreamTapTargetPadding(
  minSize: const Size.square(kMinInteractiveDimension),
  alignment: AlignmentDirectional.topEnd,
  child: MyRemoveBadge(),
)

{@end-tool}

Inheritance

Constructors

StreamTapTargetPadding({Key? key, required Size minSize, AlignmentGeometry alignment = Alignment.center, Widget? child})
Creates a tap-target padding box.
const

Properties

alignment → AlignmentGeometry
Where the child should be positioned within the padded box when the box is larger than the child.
final
child → Widget?
The widget below this widget in the tree.
finalinherited
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
minSize → Size
The minimum size this widget will occupy.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

createElement() → SingleChildRenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
inherited
createRenderObject(BuildContext context) → RenderObject
Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget.
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
didUnmountRenderObject(covariant RenderObject renderObject) → void
This method is called when a RenderObject that was previously associated with this widget is removed from the render tree. The provided RenderObject will be of the same type as the one created by this widget's createRenderObject method.
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
updateRenderObject(BuildContext context, covariant _RenderTapTargetPadding renderObject) → void
Copies the configuration described by this RenderObjectWidget to the given RenderObject, which will be of the same type as returned by this object's createRenderObject.
override

Operators

operator ==(Object other) → bool
The equality operator.
inherited