ChildBackButtonDispatcher class
A variant of BackButtonDispatcher which listens to notifications from a parent back button dispatcher, and can take priority from its parent for the handling of such notifications.
Useful when Routers are being nested within each other.
Use Router.of to obtain a reference to the nearest ancestor Router, from which the Router.backButtonDispatcher can be found, and then used as the parent of the ChildBackButtonDispatcher.
- Inheritance
-
- Object
- BackButtonDispatcher
- ChildBackButtonDispatcher
Constructors
- ChildBackButtonDispatcher.new(BackButtonDispatcher parent)
- Creates a back button dispatcher that acts as the child of another.
Properties
- hasCallbacks → bool
-
Whether a callback is currently registered.
no setterinherited
- hashCode → int
-
The hash code for this object.
no setterinherited
- parent → BackButtonDispatcher
-
The back button dispatcher that this object will attempt to take priority
over when takePriority is called.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
addCallback(
ValueGetter< Future< callback) → voidbool> > -
Register the callback to be called when the object changes.
inherited
-
createChildBackButtonDispatcher(
) → ChildBackButtonDispatcher -
Creates a ChildBackButtonDispatcher that is a direct descendant of this
back button dispatcher.
inherited
-
deferTo(
ChildBackButtonDispatcher child) → void -
Mark the given child as taking priority over this object and the other
children.
override
-
forget(
ChildBackButtonDispatcher child) → void -
Causes the given child to be removed from the list of children to which
this object might defer, as if deferTo had never been called for that
child.
inherited
-
invokeCallback(
Future< bool> defaultValue) → Future<bool> -
Handles a pop route request.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
notifiedByParent(
Future< bool> defaultValue) → Future<bool> - The parent of this child back button dispatcher decide to let this child to handle the invoke the callback request in BackButtonDispatcher.invokeCallback.
-
removeCallback(
ValueGetter< Future< callback) → voidbool> > - Remove a previously registered callback.
-
takePriority(
) → void -
Make this BackButtonDispatcher take priority among its peers.
override
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited