Web not running onFileLoading

[tuantvu]

Describe the bug
I've put print, log, and break points inside of onFileLoading while using Flutter Web, but it is not triggering, similar to this previous issue: #577

Platform

• [] Android
• [] iOS
• Web
• [] Desktop (Go)

Platform OS version
Chrome Version 91.0.4472.114 (Official Build) (x86_64)

How are you picking?

FilePickerResult? result = await FilePicker.platform.pickFiles(
  type: FileType.image,
  onFileLoading: (status) {
    if (status == FilePickerStatus.done) {
      print('FilePickerStatus: $status');
      onDone?.call();
    }
  },
);

Details to reproduce the issue
Include the snippet above in Flutter Web

Error Log
N/A

Screenshots and/or video
N/A

Flutter Version details

flutter doctor -v
[✓] Flutter (Channel stable, 2.2.2, on macOS 11.4 20F71 darwin-x64, locale en-US)
    • Flutter version 2.2.2 at /Applications/Flutter/beta
    • Framework revision d79295af24 (4 weeks ago), 2021-06-11 08:56:01 -0700
    • Engine revision 91c9fc8fe0
    • Dart version 2.13.3

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
    • Android SDK at /Users/tuan/Library/Android/sdk
    • Platform android-30, build-tools 30.0.2
    • ANDROID_HOME = /Users/tuan/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.5.1, Build version 12E507
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 4.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • 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 1.8.0_242-release-1644-b3-6222593)

[✓] VS Code (version 1.57.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.23.0

[✓] Connected device (2 available)
    • iPhone 12 Pro Max (mobile) • B0EA2CAC-293B-4D67-AB86-C903451C1060 • ios            • com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator)
    • Chrome (web)               • chrome                               • web-javascript • Google Chrome 91.0.4472.114

Additional context
N/A

[miguelpruivo]

@tuantvu I do think that files are instantly loaded as blobs whenever picked hence the reason why there aren’t any events.

Could you please elaborate your use case?

Thank you!

[tuantvu]

When the user picks a large image, like 9 mb, it takes awhile to load and looks like nothing is happening on the page. I'd like to show a progress indicator during this time. Knowing when the file is loading and done loading helps. Maybe, even if the load is instant, that callback should fire with status is done? Right now, that callback is never fired.

[miguelpruivo]

I'll see what I can do.

[miguelpruivo]

Implemented and published with 4.0.0. 🎉