[Linux] accessibility of widgets with text content

[jpnurmi]

The AtkText interface is missing implementation.

Steps to Reproduce

1. Execute flutter run on the code sample
2. Start Accerciser
3. Inspect the "Text" accessibility interface of labels and fields

Expected results:
Flutter widgets report text content through the Text accessibility interface.

Actual results:
Flutter reports that the Text accessibility interface is implemented, but all values are missing.

Flutter sample

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        inputDecorationTheme: const InputDecorationTheme(
          border: OutlineInputBorder(),
        ),
      ),
      home: Scaffold(
        body: Padding(
          padding: const EdgeInsets.all(20),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              const Text('Text', semanticsLabel: 'Text'),
              const SizedBox(height: 20),
              const SelectableText(
                'SelectableText',
                semanticsLabel: 'SelectableText',
              ),
              const SizedBox(height: 20),
              TextField(
                controller: TextEditingController(text: 'TextField'),
              ),
              const SizedBox(height: 20),
              TextField(
                readOnly: true,
                controller:
                    TextEditingController(text: 'TextField (read-only)'),
              ),
              const SizedBox(height: 20),
              TextField(
                obscureText: true,
                controller: TextEditingController(text: 'password'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

GTK sample

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.38.2 -->
<interface>
  <requires lib="gtk+" version="3.24"/>
  <object class="GtkWindow">
    <property name="can-focus">False</property>
    <child>
      <object class="GtkBox">
        <property name="visible">True</property>
        <property name="can-focus">False</property>
        <property name="margin-start">20</property>
        <property name="margin-end">20</property>
        <property name="margin-top">20</property>
        <property name="margin-bottom">20</property>
        <property name="orientation">vertical</property>
        <property name="spacing">20</property>
        <child>
          <object class="GtkLabel">
            <property name="visible">True</property>
            <property name="can-focus">False</property>
            <property name="label" translatable="yes">GtkLabel</property>
            <property name="xalign">0</property>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">0</property>
          </packing>
        </child>
        <child>
          <object class="GtkLabel">
            <property name="visible">True</property>
            <property name="can-focus">False</property>
            <property name="label" translatable="yes">GtkLabel (selectable)</property>
            <property name="selectable">True</property>
            <property name="xalign">0</property>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">1</property>
          </packing>
        </child>
        <child>
          <object class="GtkEntry">
            <property name="visible">True</property>
            <property name="can-focus">True</property>
            <property name="text" translatable="yes">GtkEntry</property>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">2</property>
          </packing>
        </child>
        <child>
          <object class="GtkEntry">
            <property name="visible">True</property>
            <property name="can-focus">True</property>
            <property name="editable">False</property>
            <property name="text" translatable="yes">GtkEntry (read-only)</property>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">3</property>
          </packing>
        </child>
        <child>
          <object class="GtkEntry">
            <property name="visible">True</property>
            <property name="can-focus">True</property>
            <property name="visibility">False</property>
            <property name="text" translatable="yes">password</property>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">4</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
  <object class="GtkTextBuffer" id="textbuffer1">
    <property name="text" translatable="yes">GtkTextView</property>
  </object>
  <object class="GtkTextBuffer" id="textbuffer2">
    <property name="text" translatable="yes">GtkTextView (read-only)</property>
  </object>
</interface>

Flutter	GTK

Flutter doctor

[✓] Flutter (Channel master, 2.13.0-0.0.pre.940, on Ubuntu 22.04 LTS 5.15.0-27-generic, locale en_US.UTF-8)
    • Flutter version 2.13.0-0.0.pre.940 at /home/jpnurmi/Flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 8094263cb7 (3 hours ago), 2022-05-06 04:59:06 -0400
    • Engine revision eb4f476fa6
    • Dart version 2.18.0 (build 2.18.0-91.0.dev)
    • DevTools version 2.13.0

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /home/jpnurmi/Android/Sdk
    • Platform android-31, build-tools 31.0.0
    • ANDROID_SDK_ROOT = /home/jpnurmi/Android/Sdk
    • Java binary at: /home/jpnurmi/Android/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
    • All Android licenses accepted.

[✓] Linux toolchain - develop for Linux desktop
    • Ubuntu clang version 14.0.0-1ubuntu1
    • cmake version 3.22.1
    • ninja version 1.10.1
    • pkg-config version 0.29.2

[✓] Android Studio (version 2020.3)
    • Android Studio at /home/jpnurmi/Android/android-studio
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)

[✓] VS Code
    • VS Code at /snap/code/current
    • Flutter extension version 3.40.0

[✓] Connected device (1 available)
    • Linux (desktop) • linux • linux-x64 • Ubuntu 22.04 LTS 5.15.0-27-generic

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

[maheshj01]

HI @jpnurmi, thanks for filing the issue. I am able to reproduce the issue on stable and the master channel. When inspecting the Text widget the text content is not returned.

flutter doctor -v (Linux)

[✓] Flutter (Channel stable, 2.10.5, on Ubuntu 20.04.4 LTS 5.13.0-30-generic, locale en_GB.UTF-8)
    • Flutter version 2.10.5 at /home/mahesh/Development/stable
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 5464c5bac7 (3 weeks ago), 2022-04-18 09:55:37 -0700
    • Engine revision 57d3bac3dd
    • Dart version 2.16.2
    • DevTools version 2.9.2

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /home/mahesh/Android/Sdk
    • Platform android-31, build-tools 31.0.0
    • Java binary at: /home/mahesh/Downloads/android-studio-2020.3.1.25-linux/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
    • All Android licenses accepted.

[✓] Chrome - develop for the web
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop
    • clang version 10.0.0-4ubuntu1
    • cmake version 3.16.3
    • ninja version 1.10.0
    • pkg-config version 0.29.1

[✓] Android Studio (version 2020.3)
    • Android Studio at /home/mahesh/Downloads/android-studio-2020.3.1.25-linux/android-studio
    • Flutter plugin version 63.2.1
    • Dart plugin version 203.8452
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)

[✓] VS Code (version 1.66.1)
    • VS Code at /usr/share/code
    • Flutter extension version 3.38.1

[✓] Connected device (2 available)
    • Linux (desktop) • linux  • linux-x64      • Ubuntu 20.04.4 LTS 5.13.0-30-generic
    • Chrome (web)    • chrome • web-javascript • Google Chrome 100.0.4896.75

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

[✓] Flutter (Channel master, 2.13.0-0.0.pre.942, on Ubuntu 20.04.4 LTS 5.13.0-30-generic, locale en_GB.UTF-8)
    • Flutter version 2.13.0-0.0.pre.942 at /home/mahesh/Development/master
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 20fd55737d (3 hours ago), 2022-05-06 06:04:06 -0400
    • Engine revision a73b884510
    • Dart version 2.18.0 (build 2.18.0-91.0.dev)
    • DevTools version 2.13.0

[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
    • Android SDK at /home/mahesh/Android/Sdk
    • Platform android-31, build-tools 31.0.0
    • Java binary at: /home/mahesh/Downloads/android-studio-2020.3.1.25-linux/android-studio/jre/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
    • All Android licenses accepted.

[✓] Chrome - develop for the web
    • Chrome at google-chrome

[✓] Linux toolchain - develop for Linux desktop
    • clang version 10.0.0-4ubuntu1
    • cmake version 3.16.3
    • ninja version 1.10.0
    • pkg-config version 0.29.1

[✓] Android Studio (version 2020.3)
    • Android Studio at /home/mahesh/Downloads/android-studio-2020.3.1.25-linux/android-studio
    • Flutter plugin version 63.2.1
    • Dart plugin version 203.8452
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)

[✓] VS Code (version 1.66.1)
    • VS Code at /usr/share/code
    • Flutter extension version 3.38.1

[✓] Connected device (2 available)
    • Linux (desktop) • linux  • linux-x64      • Ubuntu 20.04.4 LTS 5.13.0-30-generic
    • Chrome (web)    • chrome • web-javascript • Google Chrome 100.0.4896.75

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

[jpnurmi]

I only mentioned AtkText but AtkEditableText would be also important for text input.

GTK

a11y-gtk-entry.mp4

Flutter

a11y-flutter-text-field.mp4