Refactor add server form

lib/widgets/add_server/add_server_functions.dart

@@ -0,0 +1,120 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/app_localizations.dart';
+
+import 'package:adguard_home_manager/models/server.dart';
+import 'package:adguard_home_manager/widgets/add_server/add_server_modal.dart';
+import 'package:adguard_home_manager/widgets/version_warning_modal.dart';
+
+bool checkDataValid({
+  required TextEditingController nameController,
+  required TextEditingController ipDomainController,
+  required String? ipDomainError,
+  required String? pathError,
+  required String? portError,
+}) {
+  if (
+    nameController.text != '' &&
+    ipDomainController.text != '' &&
+    ipDomainError == null &&
+    pathError == null && 
+    portError == null 
+  ) {
+    return true;
+  }
+  else {
+    return false;
+  }
+}
+
+
+String? validatePort({
+  required String? value,
+  required BuildContext context
+}) {
+  if (value != null && value != '') {
+    if (int.tryParse(value) != null && int.parse(value) <= 65535) {
+      return null;
+    }
+    else {
+      return AppLocalizations.of(context)!.invalidPort;
+    }
+  }
+  else {
+    return null;
+  }
+}
+
+String? validateSubroute({
+  required BuildContext context,
+  required String? value
+}) {
+  if (value != null && value != '') {
+    RegExp subrouteRegexp = RegExp(r'^\/\b([A-Za-z0-9_\-~/]*)[^\/|\.|\:]$');
+    if (subrouteRegexp.hasMatch(value) == true) {
+      return null;
+    }
+    else {
+      return AppLocalizations.of(context)!.invalidPath;
+    }
+  }
+  else {
+    return null;
+  }
+}
+
+String? validateAddress({
+  required BuildContext context,
+  required String? value
+}) {
+  if (value != null && value != '') {
+    RegExp ipAddress = RegExp(r'^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)(\.(?!$)|$)){4}$');
+    RegExp domain = RegExp(r'^(([a-z0-9|-]+\.)*[a-z0-9|-]+\.[a-z]+)|((\w|-)+)$');
+    if (ipAddress.hasMatch(value) == true || domain.hasMatch(value) == true) {
+      return null;
+    }
+    else {
+      return AppLocalizations.of(context)!.invalidIpDomain;
+    }
+  }
+  else {
+    return AppLocalizations.of(context)!.ipDomainNotEmpty;
+  }
+}
+
+void openServerFormModal({
+  required BuildContext context,
+  required double width,
+  Server? server,
+}) {
+  showGeneralDialog(
+    context: context, 
+    barrierColor:  width <= 700 
+      ?Colors.transparent 
+      : Colors.black54,
+    transitionBuilder: (context, anim1, anim2, child) {
+      return SlideTransition(
+        position: Tween(
+          begin: const Offset(0, 1), 
+          end: const Offset(0, 0)
+        ).animate(
+          CurvedAnimation(
+            parent: anim1, 
+            curve: Curves.easeInOutCubicEmphasized
+          )
+        ),
+        child: child,
+      );
+    },
+    pageBuilder: (context, animation, secondaryAnimation) => AddServerModal(
+      fullScreen: width <= 700,
+      server: server,
+      onUnsupportedVersion: (version) => showDialog(
+        context: context, 
+        builder: (ctx) => VersionWarningModal(
+          version: version 
+        ),
+        barrierDismissible: false
+      ),
+    ),
+  );
+}