Implemented project import

Previously, the save floating action button was overlapping truth table.
Now, the screen can be scrolled such that the button will no longer
overlap due to the new empty space.

android/app/src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="ro.dcdev.logic_circuits_simulator">
    <application
-        android:label="logic_circuits_simulator"
+        android:label="Logic Circuits Simulator"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
         <activity

lib/components/truth_table.dart

@@ -0,0 +1,183 @@
+import 'package:flutter/material.dart';
+import 'package:logic_circuits_simulator/utils/iterable_extension.dart';
+
+class TruthTableHeaderText extends StatelessWidget {
+  final String text;
+  final BoxBorder? border;
+
+  const TruthTableHeaderText(this.text, {super.key, this.border});
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      decoration: BoxDecoration(
+        border: border,
+      ),
+      padding: const EdgeInsets.symmetric(
+        horizontal: 8,
+      ),
+      child: Text(
+        text,
+        textAlign: TextAlign.center,
+        style: Theme.of(context).textTheme.bodyLarge!.copyWith(
+          fontWeight: FontWeight.bold,
+          fontSize: 24,
+        ),
+      ),
+    );
+  }
+}
+
+class TruthTableTrue extends StatelessWidget {
+  final BoxBorder? border;
+  final void Function()? onTap;
+
+  const TruthTableTrue({super.key, this.border, this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      decoration: BoxDecoration(
+        border: border,
+      ),
+      child: InkWell(
+        onTap: onTap,
+        child: Text(
+          'T',
+          textAlign: TextAlign.center,
+          style: Theme.of(context).textTheme.bodyLarge!.copyWith(
+            color: Colors.green,
+            fontSize: 20,
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class TruthTableFalse extends StatelessWidget {
+  final BoxBorder? border;
+  final void Function()? onTap;
+
+  const TruthTableFalse({super.key, this.border, this.onTap});
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      decoration: BoxDecoration(
+        border: border,
+      ),
+      child: InkWell(
+        onTap: onTap,
+        child: Text(
+          'F',
+          textAlign: TextAlign.center,
+          style: Theme.of(context).textTheme.bodyLarge!.copyWith(
+            color: Colors.red,
+            fontSize: 20,
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class TruthTableEditor extends StatelessWidget {
+  static const marginBorder = BorderSide(
+    color: Colors.black,
+    width: 2,
+  );
+  static const innerBorder = BorderSide(
+    color: Colors.black45,
+    width: 1,
+  );
+
+  final List<String> inputs;
+  final List<String> outputs;
+  final List<String> truthTable;
+
+  final void Function(int, String)? onUpdateTable;
+
+  const TruthTableEditor({Key? key, required this.inputs, required this.outputs, required this.truthTable, required this.onUpdateTable}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Table(
+      defaultColumnWidth: const IntrinsicColumnWidth(),
+      border: TableBorder.symmetric(outside: const BorderSide(width: 2)),
+      children: List.generate(
+        truthTable.length + 1, 
+        (index) {
+          if (index == 0) {
+            return TableRow(
+              children: inputs
+                .indexedMap<Widget>(
+                  (index, e) => TruthTableHeaderText(
+                    e,
+                    border: Border(
+                      bottom: marginBorder,
+                      right: index == inputs.length - 1 
+                        ? marginBorder 
+                        : innerBorder,
+                    ),
+                  )
+                )
+                .followedBy(
+                  outputs
+                  .indexedMap(
+                    (index, e) => TruthTableHeaderText(
+                      e, 
+                      border: Border(
+                        bottom: const BorderSide(width: 2),
+                        right: index == outputs.length - 1
+                          ? BorderSide.none
+                          : innerBorder,
+                      ),
+                    )
+                  )
+                )
+                .toList(),
+            );
+          }
+          final inputBinary = (index - 1).toRadixString(2).padLeft(inputs.length, '0');
+          final outputBinary = truthTable[index - 1];
+
+          Widget runeToWidget({required int rune, void Function()? onTap, BoxBorder? border}) {
+            return int.parse(String.fromCharCode(rune)) != 0 
+              ? TruthTableTrue(
+                border: border,
+                onTap: onTap,
+              ) 
+              : TruthTableFalse(
+                border: border,
+                onTap: onTap,
+              );
+          }
+
+          return TableRow(
+            children: inputBinary.runes.indexedMap(
+                (i, r) => runeToWidget(
+                  rune: r, 
+                  border: i == inputBinary.runes.length - 1 
+                    ? const Border(right: marginBorder) 
+                    : const Border(right: innerBorder),
+                )
+              )
+              .followedBy(outputBinary.runes.indexedMap(
+                (i, r) => runeToWidget(
+                  rune: r,
+                  border: i == outputBinary.runes.length - 1 
+                    ? null 
+                    : const Border(right: innerBorder),
+                  onTap: onUpdateTable == null ? null : () {
+                    onUpdateTable!(index - 1, outputBinary.replaceRange(i, i+1, (outputBinary[i] == "1") ? "0" : "1"));
+                  },
+                ),
+              ))
+              .toList(),
+          );
+        },
+      ),
+    );
+  }
+}

lib/dialogs/new_ask_for_name.dart

@@ -40,6 +40,7 @@ class NewAskForNameDialog extends HookWidget {
                 child: Container(
                   constraints: const BoxConstraints(minWidth: 300),
                   child: TextField(
+                    autofocus: true,
                     controller: tec,
                     decoration: InputDecoration(
                       border: const OutlineInputBorder(),

lib/dialogs/new_project.dart

@@ -1,7 +1,12 @@
+import 'dart:io';
+
+import 'package:archive/archive.dart';
+import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
 import 'package:logic_circuits_simulator/state/projects.dart';
 import 'package:logic_circuits_simulator/utils/provider_hook.dart';
+import 'package:provider/provider.dart';
 
 class NewProjectDialog extends HookWidget {
   const NewProjectDialog({Key? key}) : super(key: key);
@@ -20,7 +25,127 @@ class NewProjectDialog extends HookWidget {
       };
     }, [newDialogNameController.text]); 
 
+    final importProjectAction = useMemoized(() {
+      return () async {
+        final projectsState = Provider.of<ProjectsState>(context, listen: false);
+        final msg = ScaffoldMessenger.of(context);
+        final nav = Navigator.of(context);
+
+        try {
+          final inputFiles = await FilePicker.platform.pickFiles(
+            dialogTitle: 'Import Project',
+            allowedExtensions: Platform.isLinux || Platform.isWindows ? ['lcsproj'] : null,
+            lockParentWindow: true,
+            type: Platform.isLinux || Platform.isWindows ? FileType.custom : FileType.any,
+            allowMultiple: false,
+            withData: true,
+          );
+
+          if (inputFiles == null) {
+            return;
+          }
+
+          final inputFile = inputFiles.files.first;
+
+          final dec = ZipDecoder();
+          final archive = dec.decodeBytes(inputFile.bytes!);
+          
+          // bool editAfter = false;
+          final result = await projectsState.importProject(
+            archive: archive,
+            onConflictingId: () async {
+              final response = await showDialog<bool>(
+                barrierDismissible: false,
+                context: context,
+                builder: (context) {
+                  return AlertDialog(
+                    title: const Text('Conflicting ID'),
+                    content: const Text('You already have a project with the same ID as the one you are importing.\n\nAre you sure you want to replace the current project with the imported one?'),
+                    actions: [
+                      TextButton(
+                        onPressed: () {
+                          Navigator.of(context).pop(false);
+                        }, 
+                        child: const Text('Cancel'),
+                      ),
+                      Theme(
+                        data: ThemeData(
+                          brightness: Theme.of(context).brightness,
+                          primarySwatch: Colors.red,
+                        ),
+                        child: ElevatedButton(
+                          onPressed: () {
+                            Navigator.of(context).pop(true);
+                          }, 
+                          child: const Text('Overwrite and import'),
+                        ),
+                      ),
+                    ],
+                  );
+                },
+              );
+
+              // Allow conflicting id ONLY if allow button is explicitly tapped
+              return response == true;
+            },
+            onConflictingName: (String name) async {
+              final response = await showDialog<bool>(
+                context: context,
+                builder: (context) {
+                  return AlertDialog(
+                    title: const Text('Conflicting name'),
+                    content: Text('You already have a project named $name.\n\nYou may import the project and have both coexist, but confusion may arise.'),
+                    actions: [
+                      TextButton(
+                        onPressed: () {
+                          Navigator.of(context).pop(false);
+                        }, 
+                        child: const Text('Cancel'),
+                      ),
+                      ElevatedButton(
+                        onPressed: () {
+                          Navigator.of(context).pop(true);
+                        }, 
+                        child: const Text('Import anyway'),
+                      ),
+                    ],
+                  );
+                },
+              );
+
+              // Allow conflicting name UNLESS deny button is explicitly tapped
+              return response != false;
+            },
+          );
+
+          if (result != null) {
+            nav.pop();
+            // if (!editAfter) {
+              msg.showSnackBar(
+                SnackBar(
+                  content: Text('Project ${result.projectName} imported'),
+                ),
+              );
+            // }
+            // else {
+            //   // TODO: Allow editing project name in the future
+            // }
+          }
+        }
+        catch (e) {
+          nav.pop();
+          msg.showSnackBar(
+            SnackBar(
+              content: Text('Failed to import project: $e'),
+              duration: const Duration(seconds: 10),
+            ),
+          );
+        }
+      };
+    });
+
     return Dialog(
+      child: SingleChildScrollView(
         child: Padding(
           padding: const EdgeInsets.all(8.0),
           child: IntrinsicWidth(
@@ -42,12 +167,7 @@ class NewProjectDialog extends HookWidget {
                   child: Padding(
                     padding: const EdgeInsets.all(8.0),
                     child: OutlinedButton.icon(
-                    onPressed: () {
-                      // TODO: Implement project importing
-                      ScaffoldMessenger.of(context).showSnackBar(const SnackBar(
-                        content: Text('Import coming soon...'),
-                      ));
-                    },
+                      onPressed: importProjectAction,
                       icon: const Icon(Icons.download),
                       label: const Text('Import Project'),
                     ),
@@ -106,6 +226,7 @@ class NewProjectDialog extends HookWidget {
             ),
           ),
         ),
+      ),
     );
   }
 }

lib/pages/edit_component.dart

@@ -3,6 +3,7 @@ import 'dart:math';
 import 'package:collection/collection.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_hooks/flutter_hooks.dart';
+import 'package:logic_circuits_simulator/components/truth_table.dart';
 import 'package:logic_circuits_simulator/dialogs/new_ask_for_name.dart';
 import 'package:logic_circuits_simulator/models/project.dart';
 import 'package:logic_circuits_simulator/state/project.dart';
@@ -97,6 +98,7 @@ class EditComponentPage extends HookWidget {
                       Navigator.of(context).pop(true);
                     },
                     style: ButtonStyle(
+                      foregroundColor: MaterialStateProperty.all(Colors.white),
                       backgroundColor: MaterialStateProperty.all(Colors.red),
                     ),
                     child: const Text('Discard'),
@@ -171,7 +173,8 @@ class EditComponentPage extends HookWidget {
             SliverList(
               delegate: SliverChildBuilderDelegate(
                 (context, idx) => ListTile(
-                  leading: inputs.value.length > 1 ? IconButton(
+                  title: Text(inputs.value[idx]),
+                  trailing: inputs.value.length > 1 ? IconButton(
                     icon: const Icon(Icons.remove_circle),
                     color: Colors.red,
                     tooltip: 'Remove input ${inputs.value[idx]}',
@@ -192,6 +195,7 @@ class EditComponentPage extends HookWidget {
                                   Navigator.of(context).pop(true);
                                 },
                                 style: ButtonStyle(
+                                  foregroundColor: MaterialStateProperty.all(Colors.white),
                                   backgroundColor: MaterialStateProperty.all(Colors.red),
                                 ),
                                 child: const Text('Remove'),
@@ -220,7 +224,6 @@ class EditComponentPage extends HookWidget {
                       }
                     },
                   ) : null,
-                  title: Text(inputs.value[idx]),
                 ),
                 childCount: inputs.value.length,
               ),
@@ -263,7 +266,8 @@ class EditComponentPage extends HookWidget {
             SliverList(
               delegate: SliverChildBuilderDelegate(
                 (context, idx) => ListTile(
-                  leading: outputs.value.length > 1 ? IconButton(
+                  title: Text(outputs.value[idx]),
+                  trailing: outputs.value.length > 1 ? IconButton(
                     icon: const Icon(Icons.remove_circle),
                     color: Colors.red,
                     tooltip: 'Remove output ${outputs.value[idx]}',
@@ -284,6 +288,7 @@ class EditComponentPage extends HookWidget {
                                   Navigator.of(context).pop(true);
                                 },
                                 style: ButtonStyle(
+                                  foregroundColor: MaterialStateProperty.all(Colors.white),
                                   backgroundColor: MaterialStateProperty.all(Colors.red),
                                 ),
                                 child: const Text('Remove'),
@@ -302,7 +307,6 @@ class EditComponentPage extends HookWidget {
                       }
                     },
                   ) : null,
-                  title: Text(outputs.value[idx]),
                 ),
                 childCount: outputs.value.length,
               ),
@@ -373,6 +377,9 @@ class EditComponentPage extends HookWidget {
                 ),
               )
             ],
+            const SliverPadding(
+              padding: EdgeInsets.only(bottom: 56 + 16 + 16),
+            ),
           ],
         ),
         floatingActionButton: !dirty ? null : FloatingActionButton(
@@ -395,155 +402,3 @@ class EditComponentPage extends HookWidget {
     );
   }
 }
-
-class TruthTableHeaderText extends StatelessWidget {
-  final String text;
-  final BoxBorder? border;
-
-  const TruthTableHeaderText(this.text, {super.key, this.border});
-
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      decoration: BoxDecoration(
-        border: border,
-      ),
-      child: Text(
-        text,
-        textAlign: TextAlign.center,
-        style: Theme.of(context).textTheme.bodyLarge!.copyWith(
-          fontWeight: FontWeight.bold,
-          fontSize: 24,
-        ),
-      ),
-    );
-  }
-}
-
-class TruthTableTrue extends StatelessWidget {
-  final BoxBorder? border;
-  final void Function()? onTap;
-
-  const TruthTableTrue({super.key, this.border, this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      decoration: BoxDecoration(
-        border: border,
-      ),
-      child: InkWell(
-        onTap: onTap,
-        child: Text(
-          'T',
-          textAlign: TextAlign.center,
-          style: Theme.of(context).textTheme.bodyLarge!.copyWith(
-            color: Colors.green,
-            fontSize: 20,
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-class TruthTableFalse extends StatelessWidget {
-  final BoxBorder? border;
-  final void Function()? onTap;
-
-  const TruthTableFalse({super.key, this.border, this.onTap});
-
-  @override
-  Widget build(BuildContext context) {
-    return Container(
-      decoration: BoxDecoration(
-        border: border,
-      ),
-      child: InkWell(
-        onTap: onTap,
-        child: Text(
-          'F',
-          textAlign: TextAlign.center,
-          style: Theme.of(context).textTheme.bodyLarge!.copyWith(
-            color: Colors.red,
-            fontSize: 20,
-          ),
-        ),
-      ),
-    );
-  }
-}
-
-class TruthTableEditor extends StatelessWidget {
-  final List<String> inputs;
-  final List<String> outputs;
-  final List<String> truthTable;
-
-  final void Function(int, String) onUpdateTable;
-
-  const TruthTableEditor({Key? key, required this.inputs, required this.outputs, required this.truthTable, required this.onUpdateTable}) : super(key: key);
-
-  @override
-  Widget build(BuildContext context) {
-    return Table(
-      defaultColumnWidth: const IntrinsicColumnWidth(),
-      border: TableBorder.symmetric(outside: const BorderSide(width: 2)),
-      children: List.generate(
-        truthTable.length + 1, 
-        (index) {
-          if (index == 0) {
-            return TableRow(
-              children: inputs
-                .indexedMap<Widget>(
-                  (index, e) => TruthTableHeaderText(
-                    e,
-                    border: Border(
-                      bottom: const BorderSide(width: 2),
-                      right: index == inputs.length - 1 ? const BorderSide(width: 2) : BorderSide.none,
-                    ),
-                  )
-                )
-                .followedBy(
-                  outputs
-                  .map((e) => TruthTableHeaderText(e, border: const Border(bottom: BorderSide(width: 2)),))
-                )
-                .toList(),
-            );
-          }
-          final inputBinary = (index - 1).toRadixString(2).padLeft(inputs.length, '0');
-          final outputBinary = truthTable[index - 1];
-
-          Widget runeToWidget({required int rune, void Function()? onTap, BoxBorder? border}) {
-            return int.parse(String.fromCharCode(rune)) != 0 
-              ? TruthTableTrue(
-                border: border,
-                onTap: onTap,
-              ) 
-              : TruthTableFalse(
-                border: border,
-                onTap: onTap,
-              );
-          }
-
-          return TableRow(
-            children: inputBinary.runes.indexedMap(
-                (i, r) => runeToWidget(
-                  rune: r, 
-                  border: i == inputBinary.runes.length - 1 ? const Border(right: BorderSide(width: 2)) : null,
-                )
-              )
-              .followedBy(outputBinary.runes.indexedMap(
-                (i, r) => runeToWidget(
-                  rune: r,
-                  onTap: () {
-                    onUpdateTable(index - 1, outputBinary.replaceRange(i, i+1, (outputBinary[i] == "1") ? "0" : "1"));
-                  },
-                ),
-              ))
-              .toList(),
-          );
-        },
-      ),
-    );
-  }
-}

lib/pages/project.dart

@@ -28,6 +28,7 @@ class ProjectPage extends StatelessWidget {
                 Navigator.of(context).pop();
               },
               style: ButtonStyle(
+                foregroundColor: MaterialStateProperty.all(Colors.white),
                 backgroundColor: MaterialStateProperty.all(Colors.red),
               ),
               child: const Text('Delete'),

lib/pages/projects.dart

@@ -1,3 +1,7 @@
+import 'dart:io';
+
+import 'package:archive/archive_io.dart';
+import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
 import 'package:logic_circuits_simulator/dialogs/new_project.dart';
@@ -5,7 +9,10 @@ import 'package:logic_circuits_simulator/models/projects.dart';
 import 'package:logic_circuits_simulator/pages/project.dart';
 import 'package:logic_circuits_simulator/state/project.dart';
 import 'package:logic_circuits_simulator/state/projects.dart';
+import 'package:path/path.dart' as path;
+import 'package:path_provider/path_provider.dart';
 import 'package:provider/provider.dart';
+import 'package:share_plus/share_plus.dart';
 
 class ProjectsPage extends StatelessWidget {
   const ProjectsPage({Key? key}) : super(key: key);
@@ -58,6 +65,61 @@ class ProjectsPage extends StatelessWidget {
     Navigator.of(context).pushNamed(ProjectPage.routeName);
   }
 
+  bool get canExport => Platform.isWindows || Platform.isMacOS || Platform.isLinux;
+  void onProjectExport(BuildContext context, ProjectEntry p) async {
+    final projectsState = Provider.of<ProjectsState>(context, listen: false);
+    final msg = ScaffoldMessenger.of(context);
+
+    final outputFile = await FilePicker.platform.saveFile(
+      dialogTitle: 'Export ${p.projectName}',
+      fileName: '${p.projectId}.lcsproj',
+      allowedExtensions: ['lcsproj'],
+      lockParentWindow: true,
+      type: FileType.custom,
+    );
+
+    if (outputFile == null) {
+      return;
+    }
+
+    final enc = ZipEncoder();
+    await projectsState.archiveProject(
+      p, 
+      (archive) async {
+        enc.encode(archive, output: OutputFileStream(outputFile));
+      },
+    );
+
+    msg.showSnackBar(
+      SnackBar(
+        content: Text('Project ${p.projectName} exported'),
+      ),
+    );
+  }
+
+  bool get canShare => !(Platform.isWindows || Platform.isLinux);
+  void onProjectShare(BuildContext context, ProjectEntry p) async {
+    final projectsState = Provider.of<ProjectsState>(context, listen: false);
+
+    final tmpDir = await getTemporaryDirectory();
+    final archiveFile = File(path.join(tmpDir.path, '${p.projectId}.lcsproj'));
+
+    final enc = ZipEncoder();
+    await projectsState.archiveProject(
+      p, 
+      (archive) async {
+        enc.encode(archive, output: OutputFileStream(archiveFile.path));
+      },
+    );
+
+    await Share.shareFiles(
+      [archiveFile.path],
+      mimeTypes: ['application/zip'],
+    );
+
+    await archiveFile.delete();
+  }
+
   @override
   Widget build(BuildContext context) {
     final projects = Provider.of<ProjectsState>(context).projects;
@@ -77,10 +139,8 @@ class ProjectsPage extends StatelessWidget {
                       child: ProjectTile(
                         p,
                         onProjectDelete: () => onProjectDelete(context, p),
-                        onProjectExport: () {
-                          // TODO: Implement project export
-                          ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('Export coming soon...')));
-                        },
+                        onProjectExport: canExport ? () => onProjectExport(context, p) : null,
+                        onProjectShare: canShare ? () => onProjectShare(context, p) : null,
                         onProjectSelect: () => onProjectSelect(context, p),
                       ),
                     )).toList(growable: false),
@@ -126,10 +186,11 @@ class ProjectTile extends StatelessWidget {
   final ProjectEntry project; 
   final void Function() onProjectSelect;
   final void Function() onProjectDelete;
-  final void Function() onProjectExport;
+  final void Function()? onProjectExport;
+  final void Function()? onProjectShare;
 
   const ProjectTile(this.project,
-      {Key? key, required this.onProjectSelect, required this.onProjectDelete, required this.onProjectExport})
+      {Key? key, required this.onProjectSelect, required this.onProjectDelete, required this.onProjectExport, required this.onProjectShare})
       : super(key: key);
 
   @override
@@ -158,7 +219,10 @@ class ProjectTile extends StatelessWidget {
                   ),
                 ),
                 Padding(
-                  padding: const EdgeInsets.all(2.0),
+                  padding: const EdgeInsets.symmetric(
+                    vertical: 2.0,
+                    horizontal: 8.0,
+                  ),
                   child: Text(
                     DateFormat.yMMMd().add_jms().format(project.lastUpdate.toLocal()),
                     style: Theme.of(context).textTheme.caption,
@@ -173,10 +237,14 @@ class ProjectTile extends StatelessWidget {
               child: PopupMenuButton<String>(
                 icon: const Icon(Icons.more_horiz),
                 itemBuilder: (context) => [
-                  const PopupMenuItem(
+                  if (onProjectExport != null) const PopupMenuItem(
                     value: 'export',
                     child: Text('Export'),
                   ),
+                  if (onProjectShare != null) const PopupMenuItem(
+                    value: 'share',
+                    child: Text('Share'),
+                  ),
                   const PopupMenuItem(
                     value: 'delete',
                     child: Text('Delete'),
@@ -188,7 +256,10 @@ class ProjectTile extends StatelessWidget {
                       onProjectDelete();
                       break;
                     case 'export':
-                      onProjectExport();
+                      onProjectExport?.call();
+                      break;
+                    case 'share':
+                      onProjectShare?.call();
                       break;
                     default:
                       throw Exception('Unexpected option: $selectedOption');

lib/state/projects.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 import 'dart:io';
 
+import 'package:archive/archive_io.dart';
 import 'package:flutter/foundation.dart';
 import 'package:logic_circuits_simulator/models/projects.dart';
 import 'package:path_provider/path_provider.dart';
@@ -73,8 +74,116 @@ class ProjectsState extends ChangeNotifier {
       index.copyWith(
         projects: index.projects
           .where((p) => p.projectId != project.projectId)
-          .toList() + [project]
+          .followedBy([project])
+          .toList()
       )
     );
   }
+
+  Future<T> archiveProject<T>(ProjectEntry project, Future<T> Function(Archive archive) callback) async {
+    final projectsDir = await _getProjectsDir();
+
+    // Create dir where export is prepared
+    final exportDir = Directory(path.join(projectsDir.path, '.export'));
+    await exportDir.create();
+
+    // Write index.json with only that project
+    final exportIndex = index.copyWith(
+      projects: index.projects.where((p) => p.projectId == project.projectId).toList(growable: false),
+    );
+    final exportIndexFile = File(path.join(exportDir.path, 'index.json'));
+    await exportIndexFile.writeAsString(jsonEncode(exportIndex));
+
+    final exportProjectIdFile = File(path.join(exportDir.path, 'projectId.txt'));
+    await exportProjectIdFile.writeAsString(project.projectId);
+
+    // Copy project folder
+    final projectDir = Directory(path.join(projectsDir.path, project.projectId));
+    final exportProjectDir = Directory(path.join(exportDir.path, project.projectId));
+    await exportProjectDir.create();
+    await for (final entry in projectDir.list(recursive: true, followLinks: false)) {
+      final filename = path.relative(entry.path, from: projectDir.path);
+      if (entry is Directory) {
+        final newDir = Directory(path.join(exportProjectDir.path, filename));
+        await newDir.create(recursive: true);
+      }
+      else if (entry is File) {
+        await entry.copy(path.join(exportProjectDir.path, filename));
+      }
+      else if (entry is Link) {
+        final newLink = Link(path.join(exportProjectDir.path, filename));
+        await newLink.create(await entry.target());
+      }
+    }
+    
+    // Create archive
+    final archive = createArchiveFromDirectory(exportDir, includeDirName: false);
+
+    final result = await callback(archive);
+
+    // Remove preparation dir
+    await exportDir.delete(recursive: true);
+
+    return result;
+  }
+
+  Future<ProjectEntry?> importProject({required Archive archive, required Future<bool> Function() onConflictingId, required Future<bool> Function(String name) onConflictingName}) async {
+    final projectsDir = await _getProjectsDir();
+
+    // Create dir where import is prepared
+    final importDir = Directory(path.join(projectsDir.path, '.import'));
+    await importDir.create();
+
+    extractArchiveToDisk(archive, importDir.path);
+
+    final projectIdFile = File(path.join(importDir.path, 'projectId.txt'));
+    final projectId = (await projectIdFile.readAsString()).trim();
+
+    final indexFile = File(path.join(importDir.path, 'index.json'));
+    final importIndex = ProjectsIndex.fromJson(jsonDecode(await indexFile.readAsString()));
+
+    if (index.projects.map((p) => p.projectId).contains(projectId)) {
+      if (!await onConflictingId()) {
+        return null;
+      }
+    }
+    final importIndexEntry = importIndex.projects.where((p) => p.projectId == projectId).first;
+
+    final importProjectName = importIndexEntry.projectName;
+    if (index.projects.where((p) => p.projectId != projectId).map((p) => p.projectName).contains(importProjectName)) {
+      if (!await onConflictingName(importProjectName)) {
+        return null;
+      }
+    }
+
+    await _updateIndex(index.copyWith(
+      projects: index.projects.where((p) => p.projectId != projectId).followedBy([importIndexEntry]).toList(),
+    ));
+
+    // Copy project folder
+    final projectDir = Directory(path.join(projectsDir.path, projectId));
+    if (await projectDir.exists()) {
+      await projectDir.delete(recursive: true);
+    }
+    await projectDir.create();
+    final importProjectDir = Directory(path.join(importDir.path, projectId));
+    await for (final entry in importProjectDir.list(recursive: true, followLinks: false)) {
+      final filename = path.relative(entry.path, from: importProjectDir.path);
+      if (entry is Directory) {
+        final newDir = Directory(path.join(projectDir.path, filename));
+        await newDir.create(recursive: true);
+      }
+      else if (entry is File) {
+        await entry.copy(path.join(projectDir.path, filename));
+      }
+      else if (entry is Link) {
+        final newLink = Link(path.join(projectDir.path, filename));
+        await newLink.create(await entry.target());
+      }
+    }
+
+    await importDir.delete(recursive: true);
+
+    return index.projects.where((p) => p.projectId == projectId).first;
+  }
 }

linux/flutter/generated_plugin_registrant.cc

@@ -6,6 +6,10 @@
 
 #include "generated_plugin_registrant.h"
 
+#include <url_launcher_linux/url_launcher_plugin.h>
 
 void fl_register_plugins(FlPluginRegistry* registry) {
+  g_autoptr(FlPluginRegistrar) url_launcher_linux_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "UrlLauncherPlugin");
+  url_launcher_plugin_register_with_registrar(url_launcher_linux_registrar);
 }

linux/flutter/generated_plugins.cmake

@@ -3,6 +3,7 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  url_launcher_linux
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST

pubspec.lock

@@ -15,6 +15,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "4.0.0"
+  archive:
+    dependency: "direct main"
+    description:
+      name: archive
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.3.0"
   args:
     dependency: transitive
     description:
@@ -183,6 +190,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "6.1.2"
+  file_picker:
+    dependency: "direct main"
+    description:
+      name: file_picker
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.6.1"
   fixnum:
     dependency: transitive
     description:
@@ -209,6 +223,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.0"
+  flutter_plugin_android_lifecycle:
+    dependency: transitive
+    description:
+      name: flutter_plugin_android_lifecycle
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.6"
   flutter_test:
     dependency: "direct dev"
     description: flutter
@@ -464,6 +485,48 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
+  share_plus:
+    dependency: "direct main"
+    description:
+      name: share_plus
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.0.8"
+  share_plus_linux:
+    dependency: transitive
+    description:
+      name: share_plus_linux
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.0"
+  share_plus_macos:
+    dependency: transitive
+    description:
+      name: share_plus_macos
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.1"
+  share_plus_platform_interface:
+    dependency: transitive
+    description:
+      name: share_plus_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.3"
+  share_plus_web:
+    dependency: transitive
+    description:
+      name: share_plus_web
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.1"
+  share_plus_windows:
+    dependency: transitive
+    description:
+      name: share_plus_windows
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.1"
   shared_preferences:
     dependency: "direct main"
     description:
@@ -616,6 +679,62 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.0"
+  url_launcher:
+    dependency: transitive
+    description:
+      name: url_launcher
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.1.3"
+  url_launcher_android:
+    dependency: transitive
+    description:
+      name: url_launcher_android
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.0.17"
+  url_launcher_ios:
+    dependency: transitive
+    description:
+      name: url_launcher_ios
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.0.17"
+  url_launcher_linux:
+    dependency: transitive
+    description:
+      name: url_launcher_linux
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.1"
+  url_launcher_macos:
+    dependency: transitive
+    description:
+      name: url_launcher_macos
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.1"
+  url_launcher_platform_interface:
+    dependency: transitive
+    description:
+      name: url_launcher_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.0"
+  url_launcher_web:
+    dependency: transitive
+    description:
+      name: url_launcher_web
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.12"
+  url_launcher_windows:
+    dependency: transitive
+    description:
+      name: url_launcher_windows
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.1"
   uuid:
     dependency: "direct main"
     description:
@@ -667,4 +786,4 @@ packages:
     version: "3.1.0"
 sdks:
   dart: ">=2.17.0-266.1.beta <3.0.0"
-  flutter: ">=2.8.1"
+  flutter: ">=2.10.0"

pubspec.yaml

@@ -35,6 +35,9 @@ dependencies:
   flutter_hooks: ^0.18.3
   uuid: ^3.0.6
   collection: ^1.16.0
+  archive: ^3.3.0
+  file_picker: ^4.6.1
+  share_plus: ^4.0.8
 
 dev_dependencies:
   flutter_test:

windows/flutter/generated_plugin_registrant.cc

@@ -6,6 +6,9 @@
 
 #include "generated_plugin_registrant.h"
 
+#include <url_launcher_windows/url_launcher_windows.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
+  UrlLauncherWindowsRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("UrlLauncherWindows"));
 }

windows/flutter/generated_plugins.cmake

@@ -3,6 +3,7 @@
 #
 
 list(APPEND FLUTTER_PLUGIN_LIST
+  url_launcher_windows
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST