feat: save scheme gestures logic.

app/lib/models/local_schemes.dart

@@ -1,5 +1,7 @@
 import 'package:dde_gesture_manager/models/scheme.dart';
 
+import 'local_schemes_provider.dart';
+
 export 'local_schemes_web.dart' if (dart.library.io) 'local_schemes_linux.dart';
 
 abstract class LocalSchemeEntry implements Comparable {
@@ -20,7 +22,7 @@ abstract class LocalSchemeEntry implements Comparable {
         /// max value of DateTime ![Time Values and Time Range](https://262.ecma-international.org/11.0/#sec-time-values-and-time-range)
         this.lastModifyTime = DateTime.fromMillisecondsSinceEpoch(8640000000000000);
 
-  save();
+  save(LocalSchemesProvider provider);
 }
 
 abstract class LocalSchemesInterface<T extends LocalSchemeEntry> {

app/lib/models/local_schemes_linux.dart

@@ -8,6 +8,7 @@ import 'package:path/path.dart' show join;
 import 'package:path_provider/path_provider.dart';
 
 import 'local_schemes.dart';
+import 'local_schemes_provider.dart';
 
 export 'local_schemes.dart';
 
@@ -68,9 +69,11 @@ class LocalSchemeEntryLinux implements LocalSchemeEntry {
         this.lastModifyTime = DateTime.fromMillisecondsSinceEpoch(8640000000000000);
 
   @override
-  save() {
+  save(LocalSchemesProvider provider) {
     var file = File(path);
-    file.writeAsStringSync(json.encode(scheme));
+    file.writeAsStringSync(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/local_schemes_web.dart

@@ -3,6 +3,7 @@ import 'dart:html';
 
 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 'local_schemes.dart';
@@ -68,7 +69,7 @@ class LocalSchemeEntryWeb implements LocalSchemeEntry {
         this.lastModifyTime = DateTime.fromMillisecondsSinceEpoch(8640000000000000);
 
   @override
-  save() {
+  save(LocalSchemesProvider provider) {
     // TODO: implement save
     throw UnimplementedError();
   }

app/lib/models/scheme.dart

@@ -116,6 +116,9 @@ class Scheme {
   @ProviderModelProp()
   String? id;
 
+  @ProviderModelProp()
+  bool? readOnly;
+
   @ProviderModelProp()
   String? name;
 
@@ -129,6 +132,7 @@ class Scheme {
     if (scheme is String) scheme = json.decode(scheme);
     assert(scheme is Map);
     id = scheme['id'] ?? Uuid().v1();
+    readOnly = scheme['readOnly'] ?? false;
     name = scheme['name'];
     description = scheme['desc'];
     gestures = (scheme['gestures'] as List? ?? []).map<GestureProp>((ele) => GestureProp.parse(ele)).toList()..sort();
@@ -136,6 +140,7 @@ class Scheme {
 
   Scheme.systemDefault() {
     this.id = Uuid.NAMESPACE_NIL;
+    this.readOnly = true;
     this.name = LocaleKeys.local_manager_default_scheme_label.tr();
     this.description = LocaleKeys.local_manager_default_scheme_description.tr();
     this.gestures = [];
@@ -157,6 +162,7 @@ class Scheme {
 
   Map toJson() => {
         'id': id,
+        'readOnly': readOnly,
         'name': name,
         'desc': description,
         'gestures': gestures,