Parallel download option (#1169)

lib/pages/settings.dart

@@ -327,6 +327,19 @@ class _SettingsPageState extends State<SettingsPage> {
                                     })
                               ],
                             ),
+                            height16,
+                            Row(
+                              mainAxisAlignment: MainAxisAlignment.spaceBetween,
+                              children: [
+                                Flexible(child: Text(tr('parallelDownloads'))),
+                                Switch(
+                                    value: settingsProvider.parallelDownloads,
+                                    onChanged: (value) {
+                                      settingsProvider.parallelDownloads =
+                                          value;
+                                    })
+                              ],
+                            ),
                             height32,
                             Text(
                               tr('sourceSpecific'),

lib/providers/apps_provider.dart

@@ -657,7 +657,7 @@ class AppsProvider with ChangeNotifier {
     appsToInstall =
         moveStrToEnd(appsToInstall, obtainiumId, strB: obtainiumTempId);
 
-    for (var id in appsToInstall) {
+    Future<void> updateFn(String id, {bool skipInstalls = false}) async {
       try {
         var downloadedArtifact =
             // ignore: use_build_context_synchronously
@@ -682,24 +682,26 @@ class AppsProvider with ChangeNotifier {
         apps[id]?.downloadProgress = -1;
         notifyListeners();
         try {
-          if (downloadedFile != null) {
-            if (willBeSilent && context == null) {
-              installApk(downloadedFile, needsBGWorkaround: true);
+          if (!skipInstalls) {
+            if (downloadedFile != null) {
+              if (willBeSilent && context == null) {
+                installApk(downloadedFile, needsBGWorkaround: true);
+              } else {
+                await installApk(downloadedFile);
+              }
             } else {
-              await installApk(downloadedFile);
+              if (willBeSilent && context == null) {
+                installXApkDir(downloadedDir!, needsBGWorkaround: true);
+              } else {
+                await installXApkDir(downloadedDir!);
+              }
             }
-          } else {
             if (willBeSilent && context == null) {
-              installXApkDir(downloadedDir!, needsBGWorkaround: true);
-            } else {
-              await installXApkDir(downloadedDir!);
+              notificationsProvider?.notify(SilentUpdateAttemptNotification(
+                  [apps[appId]!.app],
+                  id: appId.hashCode));
             }
           }
-          if (willBeSilent && context == null) {
-            notificationsProvider?.notify(SilentUpdateAttemptNotification(
-                [apps[appId]!.app],
-                id: appId.hashCode));
-          }
         } finally {
           apps[id]?.downloadProgress = null;
           notifyListeners();
@@ -710,6 +712,18 @@ class AppsProvider with ChangeNotifier {
       }
     }
 
+    if (!settingsProvider.parallelDownloads) {
+      for (var id in appsToInstall) {
+        await updateFn(id);
+      }
+    } else {
+      await Future.wait(
+          appsToInstall.map((id) => updateFn(id, skipInstalls: true)));
+      for (var id in appsToInstall) {
+        await updateFn(id);
+      }
+    }
+
     if (errors.idsByErrorString.isNotEmpty) {
       throw errors;
     }

lib/providers/settings_provider.dart

@@ -425,4 +425,13 @@ class SettingsProvider with ChangeNotifier {
     prefs?.setBool('exportSettings', val);
     notifyListeners();
   }
+
+  bool get parallelDownloads {
+    return prefs?.getBool('parallelDownloads') ?? false;
+  }
+
+  set parallelDownloads(bool val) {
+    prefs?.setBool('parallelDownloads', val);
+    notifyListeners();
+  }
 }