[EC-528] Refactor Custom Fields into separate components (#1662)

* Refactored CustomFields to stop using RepeaterView and use BindableLayout and divided the different types on different files and added a factory to create them

* Fix formatting

src/App/Lists/ItemViewModels/CustomFields/BaseCustomFieldItemViewModel.cs

@@ -0,0 +1,49 @@
+using System.Windows.Input;
+using Bit.Core.Models.View;
+using Bit.Core.Utilities;
+using Xamarin.Forms;
+
+namespace Bit.App.Lists.ItemViewModels.CustomFields
+{
+    public abstract class BaseCustomFieldItemViewModel : ExtendedViewModel, ICustomFieldItemViewModel
+    {
+        protected FieldView _field;
+        protected bool _isEditing;
+        private string[] _additionalFieldProperties = new string[]
+        {
+            nameof(ValueText),
+            nameof(ShowCopyButton)
+        };
+
+        public BaseCustomFieldItemViewModel(FieldView field, bool isEditing, ICommand fieldOptionsCommand)
+        {
+            _field = field;
+            _isEditing = isEditing;
+            FieldOptionsCommand = new Command(() => fieldOptionsCommand?.Execute(this));
+        }
+
+        public FieldView Field
+        {
+            get => _field;
+            set => SetProperty(ref _field, value,
+                additionalPropertyNames: new string[]
+                {
+                    nameof(ValueText),
+                    nameof(ShowCopyButton),
+                });
+        }
+
+        public bool IsEditing => _isEditing;
+
+        public virtual bool ShowCopyButton => false;
+
+        public virtual string ValueText => _field.Value;
+
+        public ICommand FieldOptionsCommand { get; }
+
+        public void TriggerFieldChanged()
+        {
+            TriggerPropertyChanged(nameof(Field), _additionalFieldProperties);
+        }
+    }
+}

src/App/Lists/ItemViewModels/CustomFields/BooleanCustomFieldItemViewModel.cs

@@ -0,0 +1,23 @@
+using System.Windows.Input;
+using Bit.Core.Models.View;
+
+namespace Bit.App.Lists.ItemViewModels.CustomFields
+{
+    public class BooleanCustomFieldItemViewModel : BaseCustomFieldItemViewModel
+    {
+        public BooleanCustomFieldItemViewModel(FieldView field, bool isEditing, ICommand fieldOptionsCommand)
+            : base(field, isEditing, fieldOptionsCommand)
+        {
+        }
+
+        public bool BooleanValue
+        {
+            get => bool.TryParse(Field.Value, out var boolVal) && boolVal;
+            set
+            {
+                Field.Value = value.ToString().ToLower();
+                TriggerPropertyChanged(nameof(BooleanValue));
+            }
+        }
+    }
+}

src/App/Lists/ItemViewModels/CustomFields/CustomFieldItemFactory.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Windows.Input;
+using Bit.App.Utilities;
+using Bit.Core.Abstractions;
+using Bit.Core.Enums;
+using Bit.Core.Models.View;
+
+namespace Bit.App.Lists.ItemViewModels.CustomFields
+{
+    public interface ICustomFieldItemFactory
+    {
+        ICustomFieldItemViewModel CreateCustomFieldItem(FieldView field,
+                                                        bool isEditing,
+                                                        CipherView cipher,
+                                                        IPasswordPromptable passwordPromptable,
+                                                        ICommand copyFieldCommand,
+                                                        ICommand fieldOptionsCommand);
+    }
+
+    public class CustomFieldItemFactory : ICustomFieldItemFactory
+    {
+        readonly II18nService _i18nService;
+        readonly IEventService _eventService;
+
+        public CustomFieldItemFactory(II18nService i18nService, IEventService eventService)
+        {
+            _i18nService = i18nService;
+            _eventService = eventService;
+        }
+
+        public ICustomFieldItemViewModel CreateCustomFieldItem(FieldView field,
+                                                               bool isEditing,
+                                                               CipherView cipher,
+                                                               IPasswordPromptable passwordPromptable,
+                                                               ICommand copyFieldCommand,
+                                                               ICommand fieldOptionsCommand)
+        {
+            switch (field.Type)
+            {
+                case FieldType.Text:
+                    return new TextCustomFieldItemViewModel(field, isEditing, fieldOptionsCommand, copyFieldCommand);
+                case FieldType.Boolean:
+                    return new BooleanCustomFieldItemViewModel(field, isEditing, fieldOptionsCommand);
+                case FieldType.Hidden:
+                    return new HiddenCustomFieldItemViewModel(field, isEditing, fieldOptionsCommand, cipher, passwordPromptable, _eventService, copyFieldCommand);
+                case FieldType.Linked:
+                    return new LinkedCustomFieldItemViewModel(field, isEditing, fieldOptionsCommand, cipher, _i18nService);
+                default:
+                    throw new NotImplementedException("There is no custom field item for field type " + field.Type);
+            }
+        }
+    }
+}

src/App/Lists/ItemViewModels/CustomFields/HiddenCustomFieldItemViewModel.cs

@@ -0,0 +1,70 @@
+using System;
+using System.Threading.Tasks;
+using System.Windows.Input;
+using Bit.App.Utilities;
+using Bit.Core.Abstractions;
+using Bit.Core.Models.View;
+using Xamarin.CommunityToolkit.ObjectModel;
+using Xamarin.Forms;
+
+namespace Bit.App.Lists.ItemViewModels.CustomFields
+{
+    public class HiddenCustomFieldItemViewModel : BaseCustomFieldItemViewModel
+    {
+        private readonly CipherView _cipher;
+        private readonly IPasswordPromptable _passwordPromptable;
+        private readonly IEventService _eventService;
+        private bool _showHiddenValue;
+
+        public HiddenCustomFieldItemViewModel(FieldView field,
+                                              bool isEditing,
+                                              ICommand fieldOptionsCommand,
+                                              CipherView cipher,
+                                              IPasswordPromptable passwordPromptable,
+                                              IEventService eventService,
+                                              ICommand copyFieldCommand)
+            : base(field, isEditing, fieldOptionsCommand)
+        {
+            _cipher = cipher;
+            _passwordPromptable = passwordPromptable;
+            _eventService = eventService;
+
+            CopyFieldCommand = new Command(() => copyFieldCommand?.Execute(Field));
+            ToggleHiddenValueCommand = new AsyncCommand(ToggleHiddenValueAsync, (Func<bool>)null, ex =>
+            {
+#if !FDROID
+                Microsoft.AppCenter.Crashes.Crashes.TrackError(ex);
+#endif
+            });
+        }
+
+        public ICommand CopyFieldCommand { get; }
+
+        public ICommand ToggleHiddenValueCommand { get; set; }
+
+        public bool ShowHiddenValue
+        {
+            get => _showHiddenValue;
+            set => SetProperty(ref _showHiddenValue, value);
+        }
+
+        public bool ShowViewHidden => _cipher.ViewPassword || (_isEditing && _field.NewField);
+
+        public override bool ShowCopyButton => !_isEditing && _cipher.ViewPassword && !string.IsNullOrWhiteSpace(Field.Value);
+
+        public async Task ToggleHiddenValueAsync()
+        {
+            if (!_isEditing && !await _passwordPromptable.PromptPasswordAsync())
+            {
+                return;
+            }
+
+            ShowHiddenValue = !ShowHiddenValue;
+            if (ShowHiddenValue && (!_isEditing || _cipher?.Id != null))
+            {
+                await _eventService.CollectAsync(
+                    Core.Enums.EventType.Cipher_ClientToggledHiddenFieldVisible, _cipher.Id);
+            }
+        }
+    }
+}

src/App/Lists/ItemViewModels/CustomFields/ICustomFieldItemViewModel.cs

@@ -0,0 +1,13 @@
+using Bit.Core.Models.View;
+
+namespace Bit.App.Lists.ItemViewModels.CustomFields
+{
+    public interface ICustomFieldItemViewModel
+    {
+        FieldView Field { get; set; }
+
+        bool ShowCopyButton { get; }
+
+        void TriggerFieldChanged();
+    }
+}

src/App/Lists/ItemViewModels/CustomFields/LinkedCustomFieldItemViewModel.cs

@@ -0,0 +1,70 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows.Input;
+using Bit.Core;
+using Bit.Core.Abstractions;
+using Bit.Core.Enums;
+using Bit.Core.Models.View;
+
+namespace Bit.App.Lists.ItemViewModels.CustomFields
+{
+    public class LinkedCustomFieldItemViewModel : BaseCustomFieldItemViewModel
+    {
+        private readonly CipherView _cipher;
+        private readonly II18nService _i18nService;
+        private int _linkedFieldOptionSelectedIndex;
+
+        public LinkedCustomFieldItemViewModel(FieldView field, bool isEditing, ICommand fieldOptionsCommand, CipherView cipher, II18nService i18nService)
+            : base(field, isEditing, fieldOptionsCommand)
+        {
+            _cipher = cipher;
+            _i18nService = i18nService;
+
+            LinkedFieldOptionSelectedIndex = Field.LinkedId.HasValue
+                ? LinkedFieldOptions.FindIndex(lfo => lfo.Value == Field.LinkedId.Value)
+                : 0;
+
+            if (isEditing && Field.LinkedId is null)
+            {
+                field.LinkedId = LinkedFieldOptions[0].Value;
+            }
+        }
+
+        public override string ValueText
+        {
+            get
+            {
+                var i18nKey = _cipher.LinkedFieldI18nKey(Field.LinkedId.GetValueOrDefault());
+                return $"{BitwardenIcons.Link} {_i18nService.T(i18nKey)}";
+            }
+        }
+
+        public int LinkedFieldOptionSelectedIndex
+        {
+            get => _linkedFieldOptionSelectedIndex;
+            set
+            {
+                if (SetProperty(ref _linkedFieldOptionSelectedIndex, value))
+                {
+                    LinkedFieldValueChanged();
+                }
+            }
+        }
+
+        public List<KeyValuePair<string, LinkedIdType>> LinkedFieldOptions
+        {
+            get => _cipher.LinkedFieldOptions
+                .Select(kvp => new KeyValuePair<string, LinkedIdType>(_i18nService.T(kvp.Key), kvp.Value))
+                .ToList();
+        }
+
+        private void LinkedFieldValueChanged()
+        {
+            if (Field != null && LinkedFieldOptionSelectedIndex > -1)
+            {
+                Field.LinkedId = LinkedFieldOptions.Find(lfo =>
+                    lfo.Value == LinkedFieldOptions[LinkedFieldOptionSelectedIndex].Value).Value;
+            }
+        }
+    }
+}

src/App/Lists/ItemViewModels/CustomFields/TextCustomFieldItemViewModel.cs

@@ -0,0 +1,19 @@
+using System.Windows.Input;
+using Bit.Core.Models.View;
+using Xamarin.Forms;
+
+namespace Bit.App.Lists.ItemViewModels.CustomFields
+{
+    public class TextCustomFieldItemViewModel : BaseCustomFieldItemViewModel
+    {
+        public TextCustomFieldItemViewModel(FieldView field, bool isEditing, ICommand fieldOptionsCommand, ICommand copyFieldCommand)
+            : base(field, isEditing, fieldOptionsCommand)
+        {
+            CopyFieldCommand = new Command(() => copyFieldCommand?.Execute(Field));
+        }
+
+        public override bool ShowCopyButton => !_isEditing && !string.IsNullOrWhiteSpace(Field.Value);
+
+        public ICommand CopyFieldCommand { get; }
+    }
+}