AsyncButtonGroup class
Allows one pending operation at a time among descendant async buttons.
When a member's onPressed starts, that button shows loading as usual and
every other member is disabled natively, blocking pointer, keyboard, and
accessibility activation without showing loading content. Members recover
when the operation and any onError finish. Buttons outside a group, and
members with excludeFromGroup: true such as a Cancel action, are never
blocked and never block others.
The nearest group applies; nested groups coordinate their own members
independently. Only activations claim a group: a loading parameter or
AsyncButtonController.loading request affects only its own button. An
operation keeps its claim if its button is disposed, and it never releases
a newer operation's claim. Removing the group releases its members. The
group coordinates availability only; application code owns cancellation.
A claim belongs to the group where activation started. A button moved into another group mid-operation keeps loading but does not claim the new group, so that group's members stay available. A Future that never completes keeps its group blocked: give real work a timeout, or rebuild the group with a new Key to start a fresh one.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- AsyncButtonGroup
Constructors
- AsyncButtonGroup({required Widget child, Key? key})
-
Creates a group coordinating the async buttons below
child.const
Properties
- child → Widget
-
The subtree whose async buttons share this group.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< AsyncButtonGroup> -
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
Static Methods
-
isActiveOf(
BuildContext context) → bool - Whether a member operation is pending in the nearest group.