Called by the Router during recognition phase of a navigation.
If the new child component has a different Type than the existing child component,
this will resolve to false. You can't reuse an old component when the new component
is of a different Type.
Otherwise, this method delegates to the child component's routerCanReuse hook if it exists,
or resolves to true if the hook is not present.
Source
Future<bool> routerCanReuse(ComponentInstruction nextInstruction) {
Future<bool> result;
if (this._currentInstruction == null ||
this._currentInstruction.componentType !=
nextInstruction.componentType) {
result = new Future.value(false);
} else {
result = this._componentRef.then((ComponentRef ref) {
if (hasLifecycleHook(hook_mod.routerCanReuse, ref.instance)) {
return ((ref.instance as CanReuse))
.routerCanReuse(nextInstruction, this._currentInstruction);
} else {
return nextInstruction == this._currentInstruction ||
(nextInstruction.params != null) &&
(_currentInstruction.params != null) &&
const MapEquality().equals(
nextInstruction.params, this._currentInstruction.params);
}
});
}
return result;
}