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Курнат Андрей
266
XLAB2/AccountingBookDirectoryWindowViewModel.cs
Normal file
266
XLAB2/AccountingBookDirectoryWindowViewModel.cs
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.ComponentModel;
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using System.Linq;
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using System.Windows.Data;
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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 AccountingBookDirectoryWindowViewModel : ObservableObject
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{
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private readonly IDialogService _dialogService;
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private readonly DocumentNumberDirectoryService _service;
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private string _searchText;
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private GroupOption _selectedItem;
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private string _statusText;
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public AccountingBookDirectoryWindowViewModel(DocumentNumberDirectoryService service, IDialogService dialogService)
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{
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_service = service ?? throw new ArgumentNullException("service");
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_dialogService = dialogService ?? throw new ArgumentNullException("dialogService");
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Items = new ObservableCollection<GroupOption>();
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ItemsView = CollectionViewSource.GetDefaultView(Items);
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ItemsView.Filter = FilterItems;
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AddCommand = new RelayCommand(delegate { AddItem(); });
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DeleteCommand = new RelayCommand(delegate { DeleteSelectedItem(); }, delegate { return SelectedItem != null; });
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EditCommand = new RelayCommand(delegate { EditSelectedItem(); }, delegate { return SelectedItem != null; });
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RefreshCommand = new RelayCommand(delegate { RefreshItems(null); });
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UpdateStatus();
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}
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public ICommand AddCommand { get; private set; }
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public ICommand DeleteCommand { get; private set; }
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public ICommand EditCommand { get; private set; }
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public ObservableCollection<GroupOption> Items { get; private set; }
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public ICollectionView ItemsView { get; private set; }
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public ICommand RefreshCommand { get; private set; }
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public string SearchText
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{
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get { return _searchText; }
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set
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{
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if (SetProperty(ref _searchText, value))
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{
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ItemsView.Refresh();
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UpdateStatus();
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}
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}
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}
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public GroupOption SelectedItem
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{
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get { return _selectedItem; }
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set
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{
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if (SetProperty(ref _selectedItem, value))
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{
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RaiseCommandStates();
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}
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}
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}
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public string StatusText
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{
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get { return _statusText; }
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private set { SetProperty(ref _statusText, value); }
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}
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public void Initialize()
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{
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RunOperation(delegate { RefreshItems(null); }, false);
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}
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private void AddItem()
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{
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var result = _dialogService.ShowAccountingBookEditDialog(new GroupOption(), true, Items.ToList());
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if (result == null)
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{
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return;
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}
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RunOperation(delegate
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{
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var items = CloneItems(Items);
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items.Add(CloneItem(result));
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_service.SaveAccountingBooks(items);
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RefreshItems(result.Key);
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_dialogService.ShowInfo("Запись справочника добавлена.");
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}, true);
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}
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private bool Contains(string source, string searchText)
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{
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return !string.IsNullOrWhiteSpace(source)
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&& source.IndexOf(searchText, StringComparison.OrdinalIgnoreCase) >= 0;
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}
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private void DeleteSelectedItem()
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{
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if (SelectedItem == null)
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{
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return;
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}
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var selectedItem = SelectedItem;
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if (!_dialogService.Confirm(string.Format("Удалить книгу учета \"{0}\"?", selectedItem.Title)))
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{
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return;
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}
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RunOperation(delegate
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{
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var items = CloneItems(Items);
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items.RemoveAll(delegate(GroupOption item)
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{
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return string.Equals(item.Key, selectedItem.Key, StringComparison.OrdinalIgnoreCase);
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});
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_service.SaveAccountingBooks(items);
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RefreshItems(null);
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_dialogService.ShowInfo("Запись справочника удалена.");
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}, true);
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}
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private void EditSelectedItem()
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{
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if (SelectedItem == null)
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{
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return;
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}
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var seed = CloneItem(SelectedItem);
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var result = _dialogService.ShowAccountingBookEditDialog(seed, false, Items.ToList());
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if (result == null)
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{
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return;
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}
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RunOperation(delegate
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{
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var items = CloneItems(Items);
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var index = items.FindIndex(delegate(GroupOption item)
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{
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return string.Equals(item.Key, seed.Key, StringComparison.OrdinalIgnoreCase);
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});
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if (index < 0)
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{
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throw new InvalidOperationException("Не удалось найти книгу учета для обновления.");
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}
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items[index] = CloneItem(result);
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_service.SaveAccountingBooks(items);
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RefreshItems(result.Key);
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_dialogService.ShowInfo("Запись справочника обновлена.");
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}, true);
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}
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private bool FilterItems(object item)
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{
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var directoryItem = item as GroupOption;
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if (directoryItem == null)
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{
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return false;
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}
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if (string.IsNullOrWhiteSpace(SearchText))
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{
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return true;
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}
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return Contains(directoryItem.Key, SearchText)
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|| Contains(directoryItem.Title, SearchText);
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}
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private void RaiseCommandStates()
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{
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((RelayCommand)AddCommand).RaiseCanExecuteChanged();
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((RelayCommand)DeleteCommand).RaiseCanExecuteChanged();
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((RelayCommand)EditCommand).RaiseCanExecuteChanged();
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((RelayCommand)RefreshCommand).RaiseCanExecuteChanged();
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}
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private void RefreshItems(string keyToSelect)
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{
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var items = _service.LoadAccountingBooks();
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var currentKey = string.IsNullOrWhiteSpace(keyToSelect)
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? (SelectedItem == null ? null : SelectedItem.Key)
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: keyToSelect;
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Items.Clear();
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foreach (var item in items)
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{
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Items.Add(CloneItem(item));
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}
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ItemsView.Refresh();
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SelectedItem = string.IsNullOrWhiteSpace(currentKey)
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? Items.FirstOrDefault()
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: Items.FirstOrDefault(delegate(GroupOption item)
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{
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return string.Equals(item.Key, currentKey, StringComparison.OrdinalIgnoreCase);
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}) ?? Items.FirstOrDefault();
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UpdateStatus();
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}
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private void RunOperation(Action action, bool showWarningForInvalidOperation)
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{
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try
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{
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action();
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}
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catch (InvalidOperationException ex)
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{
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if (showWarningForInvalidOperation)
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{
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_dialogService.ShowWarning(ex.Message);
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return;
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}
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_dialogService.ShowError(ex.Message);
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}
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catch (Exception ex)
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{
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_dialogService.ShowError(ex.Message);
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}
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}
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private static GroupOption CloneItem(GroupOption item)
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{
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return new GroupOption
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{
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Key = item == null ? string.Empty : item.Key,
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Title = item == null ? string.Empty : item.Title
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};
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}
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private static List<GroupOption> CloneItems(IEnumerable<GroupOption> items)
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{
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var result = new List<GroupOption>();
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foreach (var item in items ?? Array.Empty<GroupOption>())
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{
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result.Add(CloneItem(item));
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}
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return result;
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}
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private void UpdateStatus()
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{
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var visibleCount = ItemsView.Cast<object>().Count();
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StatusText = string.Format("Всего записей: {0}. По фильтру: {1}.", Items.Count, visibleCount);
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}
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}
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}
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