refactor: updating receive logic for running from isolate

Have to update ui from callback instead passing animationcontroller for supporting isolates

ios/Runner/GeneratedPluginRegistrant.m

@@ -90,6 +90,12 @@
 @import url_launcher_ios;
 #endif
 
+#if __has_include(<workmanager/WorkmanagerPlugin.h>)
+#import <workmanager/WorkmanagerPlugin.h>
+#else
+@import workmanager;
+#endif
+
 @implementation GeneratedPluginRegistrant
 
 + (void)registerWithRegistry:(NSObject<FlutterPluginRegistry>*)registry {
@@ -107,6 +113,7 @@ + (void)registerWithRegistry:(NSObject<FlutterPluginRegistry>*)registry {
   [SqflitePlugin registerWithRegistrar:[registry registrarForPlugin:@"SqflitePlugin"]];
   [Sqlite3FlutterLibsPlugin registerWithRegistrar:[registry registrarForPlugin:@"Sqlite3FlutterLibsPlugin"]];
   [URLLauncherPlugin registerWithRegistrar:[registry registrarForPlugin:@"URLLauncherPlugin"]];
+  [WorkmanagerPlugin registerWithRegistrar:[registry registrarForPlugin:@"WorkmanagerPlugin"]];
 }
 
 @end

lib/classes/receiver.dart

@@ -37,8 +37,15 @@ class Receiver {
   final bool saveToTemp;
 
   ///If [downloadAnimC] is set, progress will be sent to it.
+  @Deprecated(
+      "Prefer downloadUpdatePercent() because it allows updating UI from isolates")
   final AnimationController? downloadAnimC;
 
+  ///[onDownloadUpdatePercent] will be called for each saved chunk in download operation.
+  ///
+  ///Use for animating progress.
+  final void Function(double percent)? onDownloadUpdatePercent;
+
   ///[port] listened for incoming connections. Should not set except testing or
   ///other devices will require manual port setting.
   final int? port;
@@ -62,11 +69,12 @@ class Receiver {
 
   ///Listen and receive files from other devices.
   ///
-  ///Set [downloadAnimC], [onDownloadStart], [onFileDownloaded], [onAllFilesDownloaded] for animating download progess.
+  ///Set [onDownloadUpdatePercent], [onDownloadStart], [onFileDownloaded], [onAllFilesDownloaded] for animating download progess.
   ///
   ///Call [listen] for start listening.
   Receiver(
       {this.downloadAnimC,
+      this.onDownloadUpdatePercent,
       this.useDb = true,
       this.saveToTemp = false,
       this.port,
@@ -157,9 +165,12 @@ class Receiver {
           }
           final totalLengh = request.contentLength!;
           final fileWriter = file.openWrite();
+          var downloadPercent = 0.0;
           await for (var bytes in mime.timeout(const Duration(seconds: 10))) {
             fileWriter.add(bytes);
-            downloadAnimC?.value += bytes.length / totalLengh;
+            downloadPercent += bytes.length / totalLengh;
+            downloadAnimC?.value = downloadPercent;
+            onDownloadUpdatePercent?.call(downloadPercent);
           }
           await fileWriter.flush();
           await fileWriter.close();

lib/classes/worker.dart

@@ -0,0 +1,29 @@
+import 'dart:developer';
+import 'dart:ui';
+import 'package:workmanager/workmanager.dart';
+
+enum MyTasks { receive }
+
+enum IsolatePorts { receive }
+
+final _workManager = Workmanager();
+
+@pragma("vm:entry-point")
+void _callBack() {
+  _workManager.executeTask((taskName, inputData) async {
+    final task =
+        MyTasks.values.singleWhere((element) => element.name == taskName);
+    switch (task) {
+      case MyTasks.receive:
+        final sendPort =
+            IsolateNameServer.lookupPortByName(IsolatePorts.receive.name);
+        return true;
+    }
+  });
+}
+
+Future<void> initalize() async {
+  throw UnimplementedError();
+  // ignore: dead_code
+  await _workManager.initialize(_callBack);
+}

pubspec.lock

@@ -1049,6 +1049,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "5.1.0"
+  workmanager:
+    dependency: "direct main"
+    description:
+      name: workmanager
+      sha256: ed13530cccd28c5c9959ad42d657cd0666274ca74c56dea0ca183ddd527d3a00
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.5.2"
   xdg_directories:
     dependency: transitive
     description:

pubspec.yaml

@@ -4,7 +4,7 @@ publish_to: 'none'
 version: 1.0.0+1
 
 environment:
-  sdk: '>=2.19.6 <3.0.0'
+  sdk: '>=3.2.0 <4.0.0'
 
 dependencies:
   network_discovery: ^1.0.0
@@ -39,6 +39,7 @@ dependencies:
   flutter_riverpod: ^2.4.0
   cupertino_icons: ^1.0.6
   num_remap: ^1.0.1
+  workmanager: ^0.5.2
 
 dev_dependencies:
   flutter_test: