Enhanced autofill settings (#1150)

* enhanced autofill settings

* cleanup

src/App/Pages/Settings/AutofillServicesPage.xaml.cs

@@ -0,0 +1,74 @@
+using System;
+using Xamarin.Forms;
+
+namespace Bit.App.Pages
+{
+    public partial class AutofillServicesPage : BaseContentPage
+    {
+        private readonly AutofillServicesPageViewModel _vm;
+        private readonly SettingsPage _settingsPage;
+        private DateTime? _timerStarted = null;
+        private TimeSpan _timerMaxLength = TimeSpan.FromMinutes(5);
+
+        public AutofillServicesPage(SettingsPage settingsPage)
+        {
+            InitializeComponent();
+            _vm = BindingContext as AutofillServicesPageViewModel;
+            _vm.Page = this;
+            _settingsPage = settingsPage;
+        }
+
+        protected async override void OnAppearing()
+        {
+            await _vm.InitAsync();
+            _vm.UpdateEnabled();
+            _timerStarted = DateTime.UtcNow;
+            Device.StartTimer(new TimeSpan(0, 0, 0, 0, 500), () =>
+            {
+                if (_timerStarted == null || (DateTime.UtcNow - _timerStarted) > _timerMaxLength)
+                {
+                    return false;
+                }
+                _vm.UpdateEnabled();
+                return true;
+            });
+            base.OnAppearing();
+        }
+
+        protected override void OnDisappearing()
+        {
+            _timerStarted = null;
+            _settingsPage.BuildList();
+            base.OnDisappearing();
+        }
+
+        private void ToggleAutofillService(object sender, EventArgs e)
+        {
+            if (DoOnce())
+            {
+                _vm.ToggleAutofillService();
+            }
+        }
+        
+        private void ToggleInlineAutofill(object sender, EventArgs e)
+        {
+            _vm.ToggleInlineAutofill();
+        }
+        
+        private void ToggleAccessibility(object sender, EventArgs e)
+        {
+            if (DoOnce())
+            {
+                _vm.ToggleAccessibility();
+            }
+        }
+        
+        private void ToggleDrawOver(object sender, EventArgs e)
+        {
+            if (DoOnce())
+            {
+                _vm.ToggleDrawOver();
+            }
+        }
+    }
+}