using System;

using System.Collections;

using System.Collections.Generic;

using System.Collections.Specialized;

using System.ComponentModel;

using System.Reactive;

using System.Reactive.Subjects;

using System.Windows.Input;

using ReactiveUI;

namespace ReactiveUI.Xaml

{

/// <summary>

/// IReactiveCommand is an Rx-enabled version of ICommand that is also an

/// Observable. Its Observable fires once for each invocation of

/// ICommand.Execute and its value is the CommandParameter that was

/// provided.

/// </summary>

public interface IReactiveCommand : ICommand, IObservable<object>

{

/// <summary>

/// Fires whenever the CanExecute of the ICommand changes. Note that

/// this should not fire notifications unless the CanExecute changes

/// (i.e. it should not fire 'true', 'true').

/// </summary>

IObservable<bool> CanExecuteObservable { get; }

}

/// <summary>

/// IReactiveAsyncCommand represents commands that run an asynchronous

/// operation in the background when invoked.

/// </summary>

public interface IReactiveAsyncCommand : IReactiveCommand

{

/// <summary>

/// Fires whenever the number of asynchronous operations in-flight (i.e.

/// currently running) changes and provides the new Count.

/// </summary>

IObservable<int> ItemsInflight { get; }

/// <summary>

/// Should be fired whenever an async operation starts.

/// </summary>

ISubject<Unit> AsyncStartedNotification { get; }

/// <summary>

/// Should be fired whenever an async operation completes.

/// </summary>

ISubject<Unit> AsyncCompletedNotification { get; }

/// <summary>

/// Should be fired whenever an async operation fails.

/// </summary>

ISubject<Exception> AsyncErrorNotification { get; }

}

}

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