add provider

flutter_hbb/lib/common.dart

@@ -0,0 +1,48 @@
+import 'package:flutter/material.dart';
+import 'package:ffi/ffi.dart';
+import 'package:path_provider/path_provider.dart';
+import 'dart:io';
+import 'dart:ffi';
+import 'dart:async';
+
+class HexColor extends Color {
+  HexColor(final String hexColor) : super(_getColorFromHex(hexColor));
+
+  static int _getColorFromHex(String hexColor) {
+    hexColor = hexColor.toUpperCase().replaceAll('#', '');
+    if (hexColor.length == 6) {
+      hexColor = 'FF' + hexColor;
+    }
+    return int.parse(hexColor, radix: 16);
+  }
+}
+
+// https://juejin.im/post/6844903864852807694
+class FfiModel with ChangeNotifier {
+  var _connectRemote;
+
+  FfiModel() {
+    initialzeFFI();
+  }
+
+  void addRemote() {
+    notifyListeners();
+  }
+
+  void connect(String id) {
+    _connectRemote(Utf8.toUtf8(id));
+  }
+
+  Future<Null> initialzeFFI() async {
+    final dylib = Platform.isAndroid
+        ? DynamicLibrary.open('librustdesk.so')
+        : DynamicLibrary.process();
+    final initialize = dylib.lookupFunction<Void Function(Pointer<Utf8>),
+        void Function(Pointer<Utf8>)>('initialize');
+    _connectRemote = dylib.lookupFunction<Void Function(Pointer<Utf8>),
+        void Function(Pointer<Utf8>)>('connect_remote');
+    final dir = (await getApplicationDocumentsDirectory()).path;
+    initialize(Utf8.toUtf8(dir));
+    notifyListeners();
+  }
+}