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XLAB2/SelectInstrumentsWindowViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Linq;
+using System.Windows.Input;
+
+namespace XLAB2
+{
+    internal sealed class SelectInstrumentsWindowViewModel : ObservableObject
+    {
+        private string _searchText;
+        private string _statusText;
+
+        public SelectInstrumentsWindowViewModel(string customerName, IReadOnlyList<AvailableInstrumentItem> instruments)
+        {
+            CustomerName = customerName ?? string.Empty;
+            Instruments = new ObservableCollection<AvailableInstrumentItem>(instruments ?? new List<AvailableInstrumentItem>());
+            InstrumentsView = System.Windows.Data.CollectionViewSource.GetDefaultView(Instruments);
+            InstrumentsView.Filter = FilterInstruments;
+
+            foreach (var instrument in Instruments)
+            {
+                instrument.PropertyChanged += InstrumentOnPropertyChanged;
+            }
+
+            ConfirmCommand = new RelayCommand(Confirm);
+            CancelCommand = new RelayCommand(Cancel);
+            UpdateStatus();
+        }
+
+        public event EventHandler<bool?> CloseRequested;
+
+        public ICommand CancelCommand { get; private set; }
+
+        public ICommand ConfirmCommand { get; private set; }
+
+        public string CustomerName { get; private set; }
+
+        public ObservableCollection<AvailableInstrumentItem> Instruments { get; private set; }
+
+        public ICollectionView InstrumentsView { get; private set; }
+
+        public string SearchText
+        {
+            get { return _searchText; }
+            set
+            {
+                if (SetProperty(ref _searchText, value))
+                {
+                    InstrumentsView.Refresh();
+                    UpdateStatus();
+                }
+            }
+        }
+
+        public string StatusText
+        {
+            get { return _statusText; }
+            private set { SetProperty(ref _statusText, value); }
+        }
+
+        public IReadOnlyList<AvailableInstrumentItem> GetSelectedItems()
+        {
+            return Instruments.Where(delegate(AvailableInstrumentItem item) { return item.IsSelected; }).ToList();
+        }
+
+        private void Cancel(object parameter)
+        {
+            RaiseCloseRequested(false);
+        }
+
+        private void Confirm(object parameter)
+        {
+            RaiseCloseRequested(true);
+        }
+
+        private bool FilterInstruments(object item)
+        {
+            var instrument = item as AvailableInstrumentItem;
+            if (instrument == null)
+            {
+                return false;
+            }
+
+            if (string.IsNullOrWhiteSpace(SearchText))
+            {
+                return true;
+            }
+
+            return Contains(instrument.RegistryNumber, SearchText)
+                   || Contains(instrument.InstrumentName, SearchText)
+                   || Contains(instrument.InstrumentType, SearchText)
+                   || Contains(instrument.RangeText, SearchText)
+                   || Contains(instrument.AccuracyText, SearchText)
+                   || Contains(instrument.SerialNumber, SearchText);
+        }
+
+        private void InstrumentOnPropertyChanged(object sender, PropertyChangedEventArgs e)
+        {
+            if (e.PropertyName == "IsSelected")
+            {
+                UpdateStatus();
+            }
+        }
+
+        private static bool Contains(string source, string searchText)
+        {
+            return !string.IsNullOrWhiteSpace(source)
+                   && source.IndexOf(searchText, StringComparison.OrdinalIgnoreCase) >= 0;
+        }
+
+        private void RaiseCloseRequested(bool? dialogResult)
+        {
+            var handler = CloseRequested;
+            if (handler != null)
+            {
+                handler(this, dialogResult);
+            }
+        }
+
+        private void UpdateStatus()
+        {
+            var visibleCount = InstrumentsView.Cast<object>().Count();
+            var selectedCount = Instruments.Count(delegate(AvailableInstrumentItem item) { return item.IsSelected; });
+            StatusText = string.Format("Всего: {0}. По фильтру: {1}. Выбрано: {2}.", Instruments.Count, visibleCount, selectedCount);
+        }
+    }
+}