feat: create and remove local scheme file logic.

app/lib/models/local_schemes.dart

@@ -27,4 +27,8 @@ abstract class LocalSchemeEntry implements Comparable {
 
 abstract class LocalSchemesInterface<T extends LocalSchemeEntry> {
   Future<List<T>> get schemeEntries;
+
+  Future<LocalSchemeEntry> create();
+
+  void remove(String path);
 }

app/lib/models/local_schemes_linux.dart

@@ -6,6 +6,7 @@ import 'package:dde_gesture_manager/extensions.dart';
 import 'package:dde_gesture_manager/models/scheme.dart';
 import 'package:path/path.dart' show join;
 import 'package:path_provider/path_provider.dart';
+import 'package:uuid/uuid.dart';
 
 import 'local_schemes.dart';
 import 'local_schemes_provider.dart';
@@ -43,6 +44,21 @@ class LocalSchemes implements LocalSchemesInterface<LocalSchemeEntryLinux> {
 
   @ProviderModelProp()
   List<LocalSchemeEntry>? schemes;
+
+  @override
+  Future<LocalSchemeEntry> create() async {
+    var _supportDirectory = await getApplicationSupportDirectory();
+    return LocalSchemeEntryLinux(
+        path: join(_supportDirectory.path, 'schemes', '${Uuid().v1()}.json'),
+        scheme: Scheme.create(),
+        lastModifyTime: DateTime.now(),
+      );
+  }
+
+  @override
+  void remove(String path) {
+    File(path).delete();
+  }
 }
 
 class LocalSchemeEntryLinux implements LocalSchemeEntry {

app/lib/models/local_schemes_web.dart

@@ -5,6 +5,7 @@ import 'package:dde_gesture_manager/builder/provider_annotation.dart';
 import 'package:dde_gesture_manager/extensions.dart';
 import 'package:dde_gesture_manager/models/local_schemes_provider.dart';
 import 'package:dde_gesture_manager/models/scheme.dart';
+import 'package:uuid/uuid.dart';
 
 import 'local_schemes.dart';
 
@@ -43,6 +44,18 @@ class LocalSchemes implements LocalSchemesInterface<LocalSchemeEntryWeb> {
 
   @ProviderModelProp()
   List<LocalSchemeEntry>? schemes;
+
+  @override
+  Future<LocalSchemeEntry> create() => Future.value(
+        LocalSchemeEntryWeb(
+          path: Uuid().v1(),
+          scheme: Scheme.create(),
+          lastModifyTime: DateTime.now(),
+        ),
+      );
+
+  @override
+  remove(String path) => window.localStorage.remove(path);
 }
 
 class LocalSchemeEntryWeb implements LocalSchemeEntry {
@@ -70,8 +83,9 @@ class LocalSchemeEntryWeb implements LocalSchemeEntry {
 
   @override
   save(LocalSchemesProvider provider) {
-    // TODO: implement save
-    throw UnimplementedError();
+    window.localStorage[path] = JsonEncoder.withIndent(' ' * 4).convert(scheme);
+    provider.schemes!.firstWhere((ele) => ele.scheme.id == scheme.id).lastModifyTime = DateTime.now();
+    provider.setProps(schemes: [...provider.schemes!]..sort());
   }
 
   @override

app/lib/models/scheme.dart

@@ -148,6 +148,9 @@ class Scheme {
 
   Scheme.create({this.name, this.description, this.gestures}) {
     this.id = Uuid().v1();
+    this.gestures = [];
+    this.readOnly = false;
+    this.name = 'new xxx';
   }
 
   SchemeTree buildSchemeTree() {