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object? invokeAction(
covariant Action<Intent> action,
covariant intent intent, [
BuildContext? context,
]) {
print('Action invoked: $action($intent) from $context');
super.invokeAction(action, intent, context);
return null;
}
@override
(bool, object?) invokeActionIfEnabled(
covariant Action<Intent> action,
covariant intent intent, [
BuildContext? context,
]) {
print('Action invoked: $action($intent) from $context');
return super.invokeActionIfEnabled(action, intent, context);
}
}
<code_end>
then you pass that to your top-level actions widget:
<code_start>
@override
widget build(BuildContext context) {
return actions(
dispatcher: LoggingActionDispatcher(),
actions: <type, Action<Intent>>{
SelectAllIntent: SelectAllAction(model),
},
child: builder(
builder: (context) => TextButton(
onPressed: Actions.handler<SelectAllIntent>(
context,
const SelectAllIntent(),
),
child: const Text('SELECT ALL'),
),
),
);
}
<code_end>
this logs every action as it executes, like so:
<topic_end>
<topic_start>
putting it together
the combination of actions and shortcuts is powerful: you can define generic
intents that map to specific actions at the widget level. here’s a simple app
that illustrates the concepts described above. the app creates a text field that
also has “select all” and “copy to clipboard” buttons next to it. the buttons
invoke actions to accomplish their work. all the invoked actions and
shortcuts are logged.
<code_start>
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
/// a text field that also has buttons to select all the text and copy the
/// selected text to the clipboard.
class CopyableTextField extends StatefulWidget {
const CopyableTextField({super.key, required this.title});
final string title;
@override
State<CopyableTextField> createState() => _CopyableTextFieldState();
}
class _CopyableTextFieldState extends State<CopyableTextField> {
late final TextEditingController controller = TextEditingController();
@override
void dispose() {
controller.dispose();
super.dispose();
}
@override
widget build(BuildContext context) {
return actions(
dispatcher: LoggingActionDispatcher(),
actions: <type, Action<Intent>>{
ClearIntent: ClearAction(controller),
CopyIntent: CopyAction(controller),
SelectAllIntent: SelectAllAction(controller),
},
child: builder(builder: (context) {
return scaffold(
body: center(
child: row(
children: <widget>[
const spacer(),
expanded(
child: TextField(controller: controller),
),
IconButton(
icon: const Icon(Icons.copy),
onPressed:
Actions.handler<CopyIntent>(context, const CopyIntent()),
),
IconButton(
icon: const Icon(Icons.select_all),
onPressed: Actions.handler<SelectAllIntent>(
context, const SelectAllIntent()),
),
const spacer(),
],
),