edsonbueno / focus_detector Goto Github PK

if you double tap the home button on iphone, it minimizes current app and shows all apps tiled (app is not in foreground) but doesn't trigger a warning that the app in inactive/background.

is it possible to detect if the app is closed?

also, would be nice to add more detection triggers such as when there is no internet or if you're on cellular/wifi or even custom triggers

thanks

Could init _isAppInForeground on initState?

because some native dialog pop on ui faster.
then flutter ui render.

  @override
  void initState() {
    WidgetsBinding.instance.addObserver(this);
    _isAppInForeground = (WidgetsBinding.instance.lifecycleState ?? AppLifecycleState.resumed) == AppLifecycleState.resumed;
    super.initState();
  }

onFocusGained is fired with a short delay which is undesirable in my case causing the widget to refresh its contents about .5-1sec after the user returns to the screen.

It seems visibility_detector has implemented a default delay which can be overridden by setting the instance updateInterval. This option does not seem to be available in focus_detector.

I was able to workaround this issue by adding the visibility_detector package directly to my project (which is not ideal) and setting the updateInterval from there.

VisibilityDetectorController.instance.updateInterval = Duration.zero;

This package treats visibility and focus as synonymous but they are not.

On android, for example...you'd have to use onWindowFocusChanged to detect whether the app has regained focus after switching back to it.

The clipboard, for example, cannot be accessed until the app is in focus and accessing the clipboard on "onFocusGained" from this package returns null because there is a brief delay between onResume and when the app actually gains focus. The code below can be used to detect focus on android:

public void onWindowFocusChanged(boolean hasFocus) {         
     super.onWindowFocusChanged(hasFocus);
     if(hasFocus) 
         Toast.makeText(context, text, duration).show();
 }

The package is advertised to work cross platform, but when testing it does not work.

Currently i cannot upgrade visibility detector (because of focus_detector not allowing it) ..

../../Software/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/focus_detector-2.0.1/lib/focus_detector.dart:54:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.

• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../Software/FlutterSDK/flutter/packages/flutter/lib/src/widgets/binding.dart').
  WidgetsBinding.instance?.addObserver(this);
  ^
  ../../Software/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/focus_detector-2.0.1/lib/focus_detector.dart:162:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../Software/FlutterSDK/flutter/packages/flutter/lib/src/widgets/binding.dart').
  WidgetsBinding.instance?.removeObserver(this);
  ^
  ../../Software/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.2.2/lib/src/visibility_detector_layer.dart:126:28: Warning: Operand of null-aware operation '?.' has type 'RendererBinding' which excludes null.
• 'RendererBinding' is from 'package:flutter/src/rendering/binding.dart' ('../../Software/FlutterSDK/flutter/packages/flutter/lib/src/rendering/binding.dart').
  assert(RendererBinding.instance?.renderView != null);
  ^
  ../../Software/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.2.2/lib/src/visibility_detector_layer.dart:127:50: Warning: Operand of null-aware operation '!' has type 'RendererBinding' which excludes null.
• 'RendererBinding' is from 'package:flutter/src/rendering/binding.dart' ('../../Software/FlutterSDK/flutter/packages/flutter/lib/src/rendering/binding.dart').
  var clipRect = Offset.zero & RendererBinding.instance!.renderView.size;
  ^
  ../../Software/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.2.2/lib/src/visibility_detector_layer.dart:170:26: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('../../Software/FlutterSDK/flutter/packages/flutter/lib/src/scheduler/binding.dart').
  SchedulerBinding.instance!.addPostFrameCallback((timeStamp) {
  ^
  ../../Software/FlutterSDK/flutter/.pub-cache/hosted/pub.dartlang.org/visibility_detector-0.2.2/lib/src/visibility_detector_layer.dart:193:22: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
• 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('../../Software/FlutterSDK/flutter/packages/flutter/lib/src/scheduler/binding.dart').
  SchedulerBinding.instance!

I checkout my project with my new MacBook Pro, chip Apple M1

flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 3.3.4, on macOS 13.0.1 22A400 darwin-arm (Rosetta), locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.1)
[✓] Xcode - develop for iOS and macOS (Xcode 14.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2021.3)
[✓] VS Code (version 1.75.0)
[✓] Connected device (2 available)
[✓] HTTP Host Availability

dependencies:
  focus_detector:
    git:
      url: https://github.com/ifnyas/focus_detector.git
      ref: master

And got an error after run: flutter pub get

Error on line 1, column 7: "name" field doesn't match expected name "focus_detector".
╷
1 │ name: focus_detector_v2
│ ^^^^^^^^^^^^^^^^^
╵
pub get failed (65; ╵)
exit code 65

When I quickly switched widgets, there was no response; slowing down was normal

../../../Development/flutter/.pub-cache/hosted/pub.flutter-io.cn/focus_detector-2.0.1/lib/focus_detector.dart:54:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.

• 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../Development/flutter/packages/flutter/lib/src/widgets/binding.dart').
  WidgetsBinding.instance?.addObserver(this);

visibility_detector-0.2.0/lib/src/visibility_detector_layer.dart:276:21: Error: Too many positional arguments: 1 allowed, but 2 found.
Try removing the extra positional arguments.
super.addToScene(builder, layerOffset);

Error occurs on widget test: "A Timer is still pending even after the widget tree was disposed"

Any ideas?