public LogEntryViewer(ILogEntryService logEntryService)
{
//build an observable filter
var filter = this.WhenAnyValue(x => x.SearchText)
.Throttle(TimeSpan.FromMilliseconds(250))
.Select(BuildFilter);
//filter, sort and populate reactive list.
var shared = logEntryService.Items.Connect()
.Transform(le => new LogEntryProxy(le))
.DelayRemove(TimeSpan.FromSeconds(0.75), proxy => proxy.FlagForRemove())
.Publish();
var loader = shared.Filter(filter)
.Sort(SortExpressionComparer <LogEntryProxy> .Descending(le => le.TimeStamp).ThenByDescending(l => l.Key), SortOptions.UseBinarySearch)
.ObserveOn(RxApp.MainThreadScheduler)
.Bind(out var data)
.DisposeMany()
.Subscribe();
Data = data;
//aggregate total items
var summariser = shared.QueryWhenChanged(items =>
{
var debug = items.Count(le => le.Level == LogLevel.Debug);
var info = items.Count(le => le.Level == LogLevel.Info);
var warn = items.Count(le => le.Level == LogLevel.Warning);
var error = items.Count(le => le.Level == LogLevel.Error);
return(new LogEntrySummary(debug, info, warn, error));
})
.Subscribe(s => Summary = s);
//manage user selection, delete items command
var selectedItems = _selectionController.SelectedItems.Connect().Publish();
//Build a message from selected items
_deleteItemsText = selectedItems.QueryWhenChanged(query =>
{
if (query.Count == 0)
{
return("Select log entries to delete");
}
if (query.Count == 1)
{
return("Delete selected log entry?");
}
return($"Delete {query.Count} log entries?");
})
.ToProperty(this, viewmodel => viewmodel.DeleteItemsText, "Select log entries to delete");
//make a command out of selected items - enabling the command when there is a selection
DeleteCommand = ReactiveCommand.Create(() =>
{
var toRemove = _selectionController.SelectedItems.Items.Select(proxy => proxy.Original).ToArray();
_selectionController.Clear();
logEntryService.Remove(toRemove);
}, selectedItems.QueryWhenChanged(query => query.Count > 0));
var connected = selectedItems.Connect();
var connectedItems = shared.Connect();
_cleanUp = Disposable.Create(() =>
{
loader.Dispose();
connected.Dispose();
_deleteItemsText.Dispose();
DeleteCommand.Dispose();
_selectionController.Dispose();
summariser.Dispose();
connectedItems.Dispose();
});
}
public LogEntryViewer(ILogEntryService logEntryService)
{
_logEntryService = logEntryService;
//apply filter when search text has changed
var filterApplier = this.WhenAnyValue(x => x.SearchText)
.Throttle(TimeSpan.FromMilliseconds(250))
.Select(BuildFilter)
.Subscribe(_filter.Change);
//filter, sort and populate reactive list.
var loader = logEntryService.Items.Connect()
.Transform(le => new LogEntryProxy(le))
.DelayRemove(TimeSpan.FromSeconds(0.75), proxy =>
{
proxy.FlagForRemove();
_selectionController.DeSelect(proxy);
})
.Filter(_filter)
.Sort(SortExpressionComparer <LogEntryProxy> .Descending(le => le.TimeStamp).ThenByDescending(l => l.Key), SortOptimisations.ComparesImmutableValuesOnly)
.ObserveOn(RxApp.MainThreadScheduler)
.Bind(_data)
.DisposeMany()
.Subscribe();
//aggregate total items
var summariser = logEntryService.Items.Connect()
.QueryWhenChanged(query =>
{
var items = query.Items.ToList();
var debug = items.Count(le => le.Level == LogLevel.Debug);
var info = items.Count(le => le.Level == LogLevel.Info);
var warn = items.Count(le => le.Level == LogLevel.Warning);
var error = items.Count(le => le.Level == LogLevel.Error);
return(new LogEntrySummary(debug, info, warn, error));
})
.Subscribe(s => Summary = s);
//manage user selection, delete items command
var selectedItems = _selectionController.SelectedItems.Connect().Publish();
//Build a message from selected items
_deleteItemsText = selectedItems.QueryWhenChanged(query =>
{
if (query.Count == 0)
{
return("Select log entries to delete");
}
if (query.Count == 1)
{
return("Delete selected log entry?");
}
return(string.Format("Delete {0} log entries?", query.Count));
})
.ToProperty(this, viewmodel => viewmodel.DeleteItemsText, "Select log entries to delete");
//make a command out of selected items - enabling the command when there is a selection
_deleteCommand = selectedItems
.QueryWhenChanged(query => query.Count > 0)
.ToCommand();
//Assign action when the command is invoked
var commandInvoker = this.WhenAnyObservable(x => x.DeleteCommand)
.Subscribe(_ =>
{
var toRemove = _selectionController.SelectedItems.Items.Select(proxy => proxy.Key).ToArray();
_logEntryService.Remove(toRemove);
});
var connected = selectedItems.Connect();
_cleanUp = Disposable.Create(() =>
{
loader.Dispose();
filterApplier.Dispose();
_filter.Dispose();
connected.Dispose();
_deleteItemsText.Dispose();
_deleteCommand.Dispose();
commandInvoker.Dispose();
_selectionController.Dispose();
summariser.Dispose();
});
}
