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ReactiveFragment.cs
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134 lines (113 loc) · 4.47 KB
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// Copyright (c) 2019 .NET Foundation and Contributors. All rights reserved.
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for full license information.
using System;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Reactive;
using System.Reactive.Linq;
using System.Reactive.Subjects;
namespace ReactiveUI.AndroidSupport
{
/// <summary>
/// This is a Fragment that is both an Activity and has ReactiveObject powers
/// (i.e. you can call RaiseAndSetIfChanged).
/// </summary>
/// <typeparam name="TViewModel">The view model type.</typeparam>
[SuppressMessage("StyleCop.CSharp.MaintainabilityRules", "SA1402:FileMayOnlyContainASingleType", Justification = "Classes with the same class names within.")]
public class ReactiveFragment<TViewModel> : ReactiveFragment, IViewFor<TViewModel>, ICanActivate
where TViewModel : class
{
private TViewModel _viewModel;
/// <summary>
/// Initializes a new instance of the <see cref="ReactiveFragment{TViewModel}"/> class.
/// </summary>
protected ReactiveFragment()
{
}
/// <inheritdoc/>
public TViewModel ViewModel
{
get => _viewModel;
set => this.RaiseAndSetIfChanged(ref _viewModel, value);
}
/// <inheritdoc/>
object IViewFor.ViewModel
{
get => _viewModel;
set => _viewModel = (TViewModel)value;
}
}
/// <summary>
/// This is a Fragment that is both an Activity and has ReactiveObject powers
/// (i.e. you can call RaiseAndSetIfChanged).
/// </summary>
[SuppressMessage("StyleCop.CSharp.MaintainabilityRules", "SA1402:FileMayOnlyContainASingleType", Justification = "Classes with the same class names within.")]
public class ReactiveFragment : Android.Support.V4.App.Fragment, IReactiveNotifyPropertyChanged<ReactiveFragment>, IReactiveObject, IHandleObservableErrors
{
private readonly Subject<Unit> _activated = new Subject<Unit>();
private readonly Subject<Unit> _deactivated = new Subject<Unit>();
/// <summary>
/// Initializes a new instance of the <see cref="ReactiveFragment"/> class.
/// </summary>
protected ReactiveFragment()
{
}
/// <inheritdoc/>
public event PropertyChangingEventHandler PropertyChanging;
/// <inheritdoc/>
public event PropertyChangedEventHandler PropertyChanged;
/// <inheritdoc/>
public IObservable<Exception> ThrownExceptions => this.GetThrownExceptionsObservable();
/// <summary>
/// Gets a signal when the fragment is activated.
/// </summary>
public IObservable<Unit> Activated => _activated.AsObservable();
/// <summary>
/// Gets a signal when the fragment is deactivated.
/// </summary>
public IObservable<Unit> Deactivated => _deactivated.AsObservable();
/// <inheritdoc />
public IObservable<IReactivePropertyChangedEventArgs<ReactiveFragment>> Changing => this.GetChangingObservable();
/// <inheritdoc />
public IObservable<IReactivePropertyChangedEventArgs<ReactiveFragment>> Changed => this.GetChangedObservable();
/// <inheritdoc/>
void IReactiveObject.RaisePropertyChanging(PropertyChangingEventArgs args)
{
PropertyChanging?.Invoke(this, args);
}
/// <inheritdoc/>
void IReactiveObject.RaisePropertyChanged(PropertyChangedEventArgs args)
{
PropertyChanged?.Invoke(this, args);
}
/// <inheritdoc />
public IDisposable SuppressChangeNotifications()
{
return IReactiveObjectExtensions.SuppressChangeNotifications(this);
}
/// <inheritdoc/>
public override void OnPause()
{
base.OnPause();
_deactivated.OnNext(Unit.Default);
}
/// <inheritdoc/>
public override void OnResume()
{
base.OnResume();
_activated.OnNext(Unit.Default);
}
/// <inheritdoc/>
protected override void Dispose(bool disposing)
{
if (disposing)
{
_activated?.Dispose();
_deactivated?.Dispose();
}
base.Dispose(disposing);
}
}
}