call method
T
call([
- T? v
updates the value to null
and adds it to the Stream.
Even with null-safety coming, is still an important feature to support, as
call()
doesn't accept null
values. For instance,
InputDecoration.errorText
has to be null to not show the "error state".
Sample:
final inputError = ''.obs..nil();
print('${inputError.runtimeType}: $inputError'); // outputs > RxString: null
Makes this Rx looks like a function so you can update a new
value using rx(someOtherValue)
. Practical to assign the Rx directly
to some Widget that has a signature ::onChange( value )
Example:
final myText = 'GetX rocks!'.obs;
// in your Constructor, just to check it works :P
ever( myText, print ) ;
// in your build(BuildContext) {
TextField(
onChanged: myText,
),
Implementation
// void nil() {
// subject.add(_value = null);
// }
/// Makes this Rx looks like a function so you can update a new
/// value using `rx(someOtherValue)`. Practical to assign the Rx directly
/// to some Widget that has a signature ::onChange( value )
///
/// Example:
/// ```
/// final myText = 'GetX rocks!'.obs;
///
/// // in your Constructor, just to check it works :P
/// ever( myText, print ) ;
///
/// // in your build(BuildContext) {
/// TextField(
/// onChanged: myText,
/// ),
///```
T call([T? v]) {
if (v != null) {
value = v;
}
return value;
}