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161
XLAB2/SelectInstrumentTypeWindowViewModel.cs
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161
XLAB2/SelectInstrumentTypeWindowViewModel.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 SelectInstrumentTypeWindowViewModel : ObservableObject
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{
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private string _searchText;
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private AvailableInstrumentItem _selectedType;
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private string _serialNumber;
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private string _statusText;
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public SelectInstrumentTypeWindowViewModel(string customerName, IReadOnlyList<AvailableInstrumentItem> instrumentTypes)
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{
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CustomerName = customerName ?? string.Empty;
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InstrumentTypes = new ObservableCollection<AvailableInstrumentItem>(instrumentTypes ?? new List<AvailableInstrumentItem>());
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InstrumentTypesView = CollectionViewSource.GetDefaultView(InstrumentTypes);
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InstrumentTypesView.Filter = FilterTypes;
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ConfirmCommand = new RelayCommand(Confirm, CanConfirm);
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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> InstrumentTypes { get; private set; }
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public ICollectionView InstrumentTypesView { 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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InstrumentTypesView.Refresh();
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UpdateStatus();
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}
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}
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}
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public AvailableInstrumentItem SelectedType
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{
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get { return _selectedType; }
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set
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{
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if (SetProperty(ref _selectedType, value))
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{
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((RelayCommand)ConfirmCommand).RaiseCanExecuteChanged();
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UpdateStatus();
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}
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}
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}
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public string SerialNumber
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{
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get { return _serialNumber; }
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set
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{
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if (SetProperty(ref _serialNumber, value))
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{
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((RelayCommand)ConfirmCommand).RaiseCanExecuteChanged();
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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 InstrumentTypeSelectionResult GetResult()
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{
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return SelectedType == null
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? null
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: new InstrumentTypeSelectionResult
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{
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TypeItem = SelectedType,
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SerialNumber = string.IsNullOrWhiteSpace(SerialNumber) ? string.Empty : SerialNumber.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 bool CanConfirm(object parameter)
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{
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return SelectedType != null
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&& !string.IsNullOrWhiteSpace(SerialNumber);
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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 FilterTypes(object item)
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{
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var instrumentType = item as AvailableInstrumentItem;
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if (instrumentType == 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(instrumentType.RegistryNumber, SearchText)
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|| Contains(instrumentType.InstrumentName, SearchText)
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|| Contains(instrumentType.InstrumentType, SearchText)
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|| Contains(instrumentType.RangeText, SearchText)
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|| Contains(instrumentType.AccuracyText, SearchText)
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|| Contains(instrumentType.MeasurementArea, SearchText);
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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 = InstrumentTypesView.Cast<object>().Count();
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StatusText = string.Format(
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"Всего типов: {0}. По фильтру: {1}. Выбран тип: {2}. Заводской номер: {3}.",
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InstrumentTypes.Count,
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visibleCount,
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SelectedType == null ? "нет" : "да",
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string.IsNullOrWhiteSpace(SerialNumber) ? "не указан" : "указан");
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}
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}
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}
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