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(BackButtonDispatcher parent
) - Creates a back button dispatcher that acts as the child of another. [...]
Properties
- hasCallbacks → bool
-
Whether a callback is currently registered.
read-only, inherited
- hashCode → int
-
The hash code for this object. [...]
read-only, inherited
- 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.
read-only, inherited
Methods
-
addCallback(
ValueGetter< Future< callbackbool> >) → void -
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 non-existent 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. [...]
@protected
-
removeCallback(
ValueGetter< Future< callbackbool> >) → void - Remove a previously registered callback. [...]
-
takePriority(
) → void -
Make this BackButtonDispatcher take priority among its peers. [...]
override
-
toString(
) → String -
Returns a string representation of this object.
inherited
Operators
-
operator ==(
Object other ) → bool -
The equality operator. [...]
inherited