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127
XLAB2/SpnmtpEditWindowViewModel.cs
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127
XLAB2/SpnmtpEditWindowViewModel.cs
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Windows.Input;
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namespace XLAB2
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{
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internal sealed class SpnmtpEditWindowViewModel : ObservableObject
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{
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private readonly IReadOnlyList<SpnmtpDirectoryItem> _existingItems;
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private string _name;
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private string _specialName;
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private string _validationMessage;
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public SpnmtpEditWindowViewModel(SpnmtpDirectoryItem seed, bool isNew, IReadOnlyList<SpnmtpDirectoryItem> existingItems)
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{
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var source = seed ?? new SpnmtpDirectoryItem();
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_existingItems = existingItems ?? Array.Empty<SpnmtpDirectoryItem>();
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Id = source.Id;
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IsNew = isNew;
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Name = source.Name ?? string.Empty;
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SpecialName = source.SpecialName ?? string.Empty;
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ConfirmCommand = new RelayCommand(Confirm);
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CancelCommand = new RelayCommand(Cancel);
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}
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public event EventHandler<bool?> CloseRequested;
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public ICommand CancelCommand { get; private set; }
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public ICommand ConfirmCommand { get; private set; }
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public int Id { get; private set; }
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public bool IsNew { get; private set; }
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public string Name
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{
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get { return _name; }
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set { SetProperty(ref _name, value); }
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}
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public string SpecialName
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{
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get { return _specialName; }
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set { SetProperty(ref _specialName, value); }
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}
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public string Title
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{
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get { return IsNew ? "Новое наименование типа СИ" : "Редактирование наименования типа СИ"; }
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}
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public string ValidationMessage
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{
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get { return _validationMessage; }
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private set { SetProperty(ref _validationMessage, value); }
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}
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public SpnmtpDirectoryItem ToResult()
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{
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return new SpnmtpDirectoryItem
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{
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Id = Id,
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Name = string.IsNullOrWhiteSpace(Name) ? string.Empty : Name.Trim(),
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SpecialName = string.IsNullOrWhiteSpace(SpecialName) ? string.Empty : SpecialName.Trim()
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};
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}
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private void Cancel(object parameter)
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{
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RaiseCloseRequested(false);
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}
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private void Confirm(object parameter)
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{
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var normalizedName = string.IsNullOrWhiteSpace(Name) ? string.Empty : Name.Trim();
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var normalizedSpecialName = string.IsNullOrWhiteSpace(SpecialName) ? string.Empty : SpecialName.Trim();
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if (normalizedName.Length == 0)
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{
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ValidationMessage = "Укажите наименование типа СИ.";
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return;
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}
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if (normalizedName.Length > SpnmtpDirectoryRules.NameMaxLength)
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{
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ValidationMessage = string.Format("Наименование типа СИ не должно превышать {0} символов.", SpnmtpDirectoryRules.NameMaxLength);
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return;
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}
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if (normalizedSpecialName.Length > SpnmtpDirectoryRules.SpecialNameMaxLength)
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{
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ValidationMessage = string.Format("Специальное наименование типа не должно превышать {0} символов.", SpnmtpDirectoryRules.SpecialNameMaxLength);
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return;
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}
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var duplicate = _existingItems.FirstOrDefault(delegate(SpnmtpDirectoryItem item)
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{
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return item != null
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&& item.Id != Id
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&& string.Equals(
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string.IsNullOrWhiteSpace(item.Name) ? string.Empty : item.Name.Trim(),
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normalizedName,
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StringComparison.OrdinalIgnoreCase);
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});
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if (duplicate != null)
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{
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ValidationMessage = string.Format("Наименование типа СИ \"{0}\" уже существует в справочнике.", normalizedName);
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return;
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}
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ValidationMessage = string.Empty;
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RaiseCloseRequested(true);
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}
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private void RaiseCloseRequested(bool? dialogResult)
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{
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var handler = CloseRequested;
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if (handler != null)
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{
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handler(this, dialogResult);
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}
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}
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}
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}
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