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Курнат Андрей
294
XLAB2/SpoiDirectoryWindowViewModel.cs
Normal file
294
XLAB2/SpoiDirectoryWindowViewModel.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.Threading.Tasks;
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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 SpoiDirectoryWindowViewModel : ObservableObject
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{
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private readonly IDialogService _dialogService;
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private readonly PsvDataService _service;
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private bool _isBusy;
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private string _searchText;
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private SpoiDirectoryItem _selectedItem;
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private string _statusText;
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public SpoiDirectoryWindowViewModel(PsvDataService service, IDialogService dialogService)
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{
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_service = service;
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_dialogService = dialogService;
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Items = new ObservableCollection<SpoiDirectoryItem>();
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ItemsView = CollectionViewSource.GetDefaultView(Items);
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ItemsView.Filter = FilterItems;
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AddCommand = new RelayCommand(delegate { AddItemAsync(); }, delegate { return !IsBusy; });
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DeleteCommand = new RelayCommand(delegate { DeleteSelectedItemAsync(); }, delegate { return !IsBusy && SelectedItem != null; });
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EditCommand = new RelayCommand(delegate { EditSelectedItemAsync(); }, delegate { return !IsBusy && SelectedItem != null; });
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RefreshCommand = new RelayCommand(delegate { RefreshAsync(); }, delegate { return !IsBusy; });
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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<SpoiDirectoryItem> Items { get; private set; }
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public ICollectionView ItemsView { get; private set; }
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public bool IsBusy
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{
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get { return _isBusy; }
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private set
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{
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if (SetProperty(ref _isBusy, 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 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 SpoiDirectoryItem 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 async Task InitializeAsync()
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{
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await ExecuteBusyOperationAsync(delegate { return RefreshCoreAsync(null); });
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}
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private void AddItemAsync()
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{
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var result = _dialogService.ShowSpoiEditDialog(new SpoiDirectoryItem(), 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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RunMutationOperation(async delegate
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{
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var createdId = await Task.Run(delegate { return _service.AddSpoiItem(result); });
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await RefreshCoreAsync(createdId);
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_dialogService.ShowInfo("Запись справочника добавлена.");
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});
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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 DeleteSelectedItemAsync()
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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 запись \"{0}\"?", selectedItem.Name)))
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{
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return;
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}
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RunMutationOperation(async delegate
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{
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var deleteResult = await Task.Run(delegate { return _service.DeleteSpoiItem(selectedItem.Id); });
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if (!deleteResult.IsDeleted)
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{
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_dialogService.ShowWarning(deleteResult.WarningMessage);
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return;
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}
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await RefreshCoreAsync(null);
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_dialogService.ShowInfo("Запись справочника удалена.");
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});
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}
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private void EditSelectedItemAsync()
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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 = new SpoiDirectoryItem
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{
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Id = SelectedItem.Id,
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Code = SelectedItem.Code,
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Name = SelectedItem.Name
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};
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var result = _dialogService.ShowSpoiEditDialog(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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RunMutationOperation(async delegate
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{
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await Task.Run(delegate { _service.UpdateSpoiItem(result); });
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await RefreshCoreAsync(result.Id);
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_dialogService.ShowInfo("Запись справочника обновлена.");
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});
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}
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private async Task ExecuteBusyOperationAsync(Func<Task> operation)
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{
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try
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{
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IsBusy = true;
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await operation();
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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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finally
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{
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IsBusy = false;
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}
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}
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private async Task ExecuteMutationOperationAsync(Func<Task> operation)
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{
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try
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{
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IsBusy = true;
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await operation();
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}
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catch (InvalidOperationException ex)
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{
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_dialogService.ShowWarning(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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finally
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{
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IsBusy = false;
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}
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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 SpoiDirectoryItem;
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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.Code, SearchText)
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|| Contains(directoryItem.Name, SearchText)
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|| directoryItem.Id.ToString().IndexOf(SearchText, StringComparison.OrdinalIgnoreCase) >= 0;
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}
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private async Task RefreshCoreAsync(int? idToSelect)
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{
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var items = await _service.LoadSpoiItemsAsync();
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var currentId = idToSelect ?? (SelectedItem == null ? (int?)null : SelectedItem.Id);
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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(item);
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}
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ItemsView.Refresh();
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SelectedItem = currentId.HasValue
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? Items.FirstOrDefault(delegate(SpoiDirectoryItem item) { return item.Id == currentId.Value; })
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: Items.FirstOrDefault();
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UpdateStatus();
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}
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private void RefreshAsync()
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{
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RunBusyOperation(delegate { return RefreshCoreAsync(null); });
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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 async void RunBusyOperation(Func<Task> operation)
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{
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try
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{
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await ExecuteBusyOperationAsync(operation);
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}
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catch (Exception ex)
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{
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IsBusy = false;
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_dialogService.ShowError(ex.Message);
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}
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}
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private async void RunMutationOperation(Func<Task> operation)
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{
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try
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{
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await ExecuteMutationOperationAsync(operation);
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}
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catch (Exception ex)
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{
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IsBusy = false;
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_dialogService.ShowError(ex.Message);
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}
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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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