130 lines
4.2 KiB
C#
130 lines
4.2 KiB
C#
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.Input;
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namespace XLAB2
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{
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internal sealed class SelectInstrumentsWindowViewModel : ObservableObject
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{
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private string _searchText;
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private string _statusText;
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public SelectInstrumentsWindowViewModel(string customerName, IReadOnlyList<AvailableInstrumentItem> instruments)
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{
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CustomerName = customerName ?? string.Empty;
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Instruments = new ObservableCollection<AvailableInstrumentItem>(instruments ?? new List<AvailableInstrumentItem>());
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InstrumentsView = System.Windows.Data.CollectionViewSource.GetDefaultView(Instruments);
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InstrumentsView.Filter = FilterInstruments;
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foreach (var instrument in Instruments)
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{
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instrument.PropertyChanged += InstrumentOnPropertyChanged;
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}
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ConfirmCommand = new RelayCommand(Confirm);
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CancelCommand = new RelayCommand(Cancel);
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UpdateStatus();
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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 string CustomerName { get; private set; }
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public ObservableCollection<AvailableInstrumentItem> Instruments { get; private set; }
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public ICollectionView InstrumentsView { 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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InstrumentsView.Refresh();
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UpdateStatus();
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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 IReadOnlyList<AvailableInstrumentItem> GetSelectedItems()
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{
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return Instruments.Where(delegate(AvailableInstrumentItem item) { return item.IsSelected; }).ToList();
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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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RaiseCloseRequested(true);
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}
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private bool FilterInstruments(object item)
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{
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var instrument = item as AvailableInstrumentItem;
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if (instrument == 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(instrument.RegistryNumber, SearchText)
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|| Contains(instrument.InstrumentName, SearchText)
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|| Contains(instrument.InstrumentType, SearchText)
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|| Contains(instrument.RangeText, SearchText)
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|| Contains(instrument.AccuracyText, SearchText)
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|| Contains(instrument.SerialNumber, SearchText);
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}
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private void InstrumentOnPropertyChanged(object sender, PropertyChangedEventArgs e)
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{
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if (e.PropertyName == "IsSelected")
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{
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UpdateStatus();
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}
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}
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private static 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 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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private void UpdateStatus()
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{
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var visibleCount = InstrumentsView.Cast<object>().Count();
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var selectedCount = Instruments.Count(delegate(AvailableInstrumentItem item) { return item.IsSelected; });
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StatusText = string.Format("Всего: {0}. По фильтру: {1}. Выбрано: {2}.", Instruments.Count, visibleCount, selectedCount);
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}
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}
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}
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