using System;

using System.Windows;

using System.Windows.Controls;

using ReactiveUI.Xaml;

namespace ReactiveUI.Routing

{

public class ViewModelViewHost : ContentControl

{

public IReactiveNotifyPropertyChanged ViewModel {

get { return (IReactiveNotifyPropertyChanged)GetValue(ViewModelProperty); }

set { SetValue(ViewModelProperty, value); }

}

public static readonly DependencyProperty ViewModelProperty =

DependencyProperty.Register("ViewModel", typeof(IReactiveNotifyPropertyChanged), typeof(ViewModelViewHost), new PropertyMetadata(null));

public object DefaultContent {

get { return (object)GetValue(DefaultContentProperty); }

set { SetValue(DefaultContentProperty, value); }

}

public static readonly DependencyProperty DefaultContentProperty =

DependencyProperty.Register("DefaultContent", typeof(object), typeof(ViewModelViewHost), new PropertyMetadata(null));

public ViewModelViewHost()

{

this.ObservableFromDP(x => x.ViewModel)

.Subscribe(vm => {

if (vm.Value == null) {

Content = DefaultContent;

return;

}

var view = RxRouting.ResolveView(vm.Value);

view.ViewModel = vm.Value;

Content = view;

});

}

}

}