Flutter / Dart 中的 AcessibilityEvent

Question

I'm 3 weeks looking for how to use the accessibility event with dart, has anyone got anything yet? I did not find anything in the documentation

Answer 1

Accessibility information can be provided via the Semantics widget. Most widgets in the Material and Cupertino libraries already provide relevant semantics, such as MaterialButton s identifying as a button and so on. The Semantics widget is only necessary if you create your own widgets out of primitive layouts or painters.

For example, say you wanted to make your own button and started with a Text widget and a gesture detector.

Widget build(_) {
  return Container(
    child: GestureDetector(
      onTap: () { ... }
      child: Text('MY BUTTON'),
    )
  );
}

This will already contain some semantic information from the Text and GestureDetector widgets. While running the app, you can press S (capital "S") if TalkBack or VoiceOver is enabled to print the current semantic tree.

[   +6 ms] I/flutter ( 6511): SemanticsNode#0
[        ] I/flutter ( 6511):  │ Rect.fromLTRB(0.0, 0.0, 1080.0, 1794.0)
[        ] I/flutter ( 6511):  │
[        ] I/flutter ( 6511):  └─SemanticsNode#1
[        ] I/flutter ( 6511):      Rect.fromLTRB(0.0, 0.0, 79.0, 16.0) with transform
[        ] I/flutter ( 6511):        [2.625,0.0,0.0,436.3125; 0.0,2.625,0.0,876.0; 0.0,0.0,1.0,0.0;
[        ] I/flutter ( 6511):        0.0,0.0,0.0,1.0]
[        ] I/flutter ( 6511):      actions: tap
[        ] I/flutter ( 6511):      label: "MY BUTTON"
[        ] I/flutter ( 6511):      textDirection: ltr

In this case to specifically identify this as a button, you can wrap your widgets with a Semantics widget an provide button: true and container: true .

Widget build(_) {
  return Semantics(
    container: true,
    button: true,
    child: Container(
      child: GestureDetector(
        onTap: () { ... }
        child: Text('MY BUTTON'),
      )
    )
  );
}

Answer 2

No, I mean accessibility events, to automate my gizmo and in the future make a teamviewer on flutter

Send Clicks, etcs.

Answer 3

Check this link out. It introduces accessibility bridge in flutter than can be used to achieve what you want.

https://api.flutter.dev/javadoc/io/flutter/view/AccessibilityBridge.html