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using System;
using System.Collections.ObjectModel;
using System.Reactive.Linq;
using DynamicData;
using DynamicData.Binding;
using DynamicData.PLinq;
using Trader.Client.Infrastucture;
using Trader.Domain.Infrastucture;
using Trader.Domain.Model;
using Trader.Domain.Services;
namespace Trader.Client.Views
public class PagedDataViewer : AbstractNotifyPropertyChanged, IDisposable
private readonly IDisposable _cleanUp;
private readonly ReadOnlyObservableCollection<TradeProxy> _data;
private string _searchText;
public PagedDataViewer(ITradeService tradeService, ISchedulerProvider schedulerProvider)
//build observable predicate from search text
var filter = this.WhenValueChanged(t => t.SearchText)
//build observable sort comparer
var sort = SortParameters.WhenValueChanged(t => t.SelectedItem)
.Select(prop => prop.Comparer)
var pager = PageParameters.WhenChanged(vm=>vm.PageSize,vm=>vm.CurrentPage, (_,size, pge) => new PageRequest(pge, size))
.StartWith(new PageRequest(1, 25))
// filter, sort, page and bind to observable collection
_cleanUp = tradeService.All.Connect()
.Filter(filter) // apply user filter
.Transform(trade => new TradeProxy(trade), new ParallelisationOptions(ParallelType.Ordered, 5))
.Sort(sort, SortOptimisations.ComparesImmutableValuesOnly)
.Do(changes => PageParameters.Update(changes.Response))
.Bind(out _data) // update observable collection bindings
.DisposeMany() // dispose when no longer required
private static Func<Trade, bool> BuildFilter(string searchText)
if (string.IsNullOrEmpty(searchText)) return trade => true;
return t => t.CurrencyPair.Contains(searchText, StringComparison.OrdinalIgnoreCase) ||
t.Customer.Contains(searchText, StringComparison.OrdinalIgnoreCase);
public string SearchText
get => _searchText;
set => SetAndRaise(ref _searchText, value);
public ReadOnlyObservableCollection<TradeProxy> Data => _data;
public PageParameterData PageParameters { get;} = new PageParameterData(1,25);
public SortParameterData SortParameters { get; } = new SortParameterData();
public void Dispose()