Add support for prevent screen capture

lib/platform/display.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+import 'package:logging/logging.dart';
+
+final _log = Logger("platformDisplay");
+
+class Display {
+  static const platform =
+      MethodChannel("lifegpc.eh_downloader_flutter/display");
+  Future<bool> disableProtect() async {
+    if (kIsWeb) return true;
+    try {
+      await platform.invokeMethod<void>("disableProtect");
+      return true;
+    } catch (e) {
+      _log.warning("Failed to disable protect", e);
+      return false;
+    }
+  }
+
+  Future<bool> enableProtect() async {
+    if (kIsWeb) return true;
+    try {
+      await platform.invokeMethod<void>("enableProtect");
+      return true;
+    } catch (e) {
+      _log.warning("Failed to enable protect", e);
+      return false;
+    }
+  }
+}