Some improvements

lib/screens/settings/encryption/custom_text_field.dart

@@ -0,0 +1,60 @@
+import 'package:flutter/material.dart';
+
+class EncryptionTextField extends StatelessWidget {
+  final bool enabled;
+  final TextEditingController controller;
+  final IconData icon;
+  final void Function(String) onChanged;
+  final String? errorText;
+  final String label;
+  final TextInputType? keyboardType;
+  final bool? multiline;
+  final String? helperText;
+
+  const EncryptionTextField({
+    Key? key,
+    required this.enabled,
+    required this.controller,
+    required this.icon,
+    required this.onChanged,
+    this.errorText,
+    required this.label,
+    this.keyboardType,
+    this.multiline,
+    this.helperText,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Padding(
+      padding: const EdgeInsets.symmetric(horizontal: 20),
+      child: ConstrainedBox(
+        constraints: const BoxConstraints(
+          maxHeight: 200
+        ),
+        child: TextFormField(
+          enabled: enabled,
+          controller: controller,
+          onChanged: onChanged,
+          decoration: InputDecoration(
+            prefixIcon: Icon(icon),
+            border: const OutlineInputBorder(
+              borderRadius: BorderRadius.all(
+                Radius.circular(10)
+              )
+            ),
+            errorText: errorText,
+            labelText: label,
+            helperText: helperText,
+            helperMaxLines: 10,
+            helperStyle: TextStyle(
+              color: Theme.of(context).listTileTheme.iconColor
+            )
+          ),
+          keyboardType: TextInputType.multiline,
+          maxLines: multiline == true ? null : 1,
+        ),
+      ),
+    );
+  }
+}