Nikita Tsukanov
5 years ago
45 changed files with 349 additions and 145 deletions
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using System; |
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using System.Threading.Tasks; |
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using System.Windows.Input; |
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namespace MiniMvvm |
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{ |
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public sealed class MiniCommand<T> : MiniCommand, ICommand |
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{ |
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private readonly Action<T> _cb; |
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private bool _busy; |
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private Func<T, Task> _acb; |
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public MiniCommand(Action<T> cb) |
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{ |
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_cb = cb; |
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} |
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public MiniCommand(Func<T, Task> cb) |
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{ |
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_acb = cb; |
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} |
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private bool Busy |
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{ |
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get => _busy; |
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set |
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{ |
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_busy = value; |
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CanExecuteChanged?.Invoke(this, EventArgs.Empty); |
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} |
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} |
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public override event EventHandler CanExecuteChanged; |
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public override bool CanExecute(object parameter) => !_busy; |
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public override async void Execute(object parameter) |
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{ |
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if(Busy) |
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return; |
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try |
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{ |
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Busy = true; |
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if (_cb != null) |
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_cb((T)parameter); |
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else |
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await _acb((T)parameter); |
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} |
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finally |
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{ |
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Busy = false; |
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} |
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} |
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} |
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public abstract class MiniCommand : ICommand |
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{ |
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public static MiniCommand Create(Action cb) => new MiniCommand<object>(_ => cb()); |
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public static MiniCommand Create<TArg>(Action<TArg> cb) => new MiniCommand<TArg>(cb); |
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public static MiniCommand CreateFromTask(Func<Task> cb) => new MiniCommand<object>(_ => cb()); |
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public abstract bool CanExecute(object parameter); |
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public abstract void Execute(object parameter); |
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public abstract event EventHandler CanExecuteChanged; |
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} |
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} |
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@ -0,0 +1,6 @@ |
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<Project Sdk="Microsoft.NET.Sdk"> |
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<PropertyGroup> |
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<TargetFramework>netstandard2.0</TargetFramework> |
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</PropertyGroup> |
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<Import Project="..\..\build\Rx.props" /> |
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</Project> |
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@ -0,0 +1,108 @@ |
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using System; |
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using System.ComponentModel; |
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using System.Linq.Expressions; |
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using System.Reactive.Linq; |
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using System.Reflection; |
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namespace MiniMvvm |
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{ |
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public static class PropertyChangedExtensions |
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{ |
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class PropertyObservable<T> : IObservable<T> |
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{ |
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private readonly INotifyPropertyChanged _target; |
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private readonly PropertyInfo _info; |
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public PropertyObservable(INotifyPropertyChanged target, PropertyInfo info) |
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{ |
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_target = target; |
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_info = info; |
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} |
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class Subscription : IDisposable |
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{ |
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private readonly INotifyPropertyChanged _target; |
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private readonly PropertyInfo _info; |
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private readonly IObserver<T> _observer; |
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public Subscription(INotifyPropertyChanged target, PropertyInfo info, IObserver<T> observer) |
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{ |
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_target = target; |
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_info = info; |
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_observer = observer; |
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_target.PropertyChanged += OnPropertyChanged; |
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_observer.OnNext((T)_info.GetValue(_target)); |
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} |
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private void OnPropertyChanged(object sender, PropertyChangedEventArgs e) |
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{ |
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if (e.PropertyName == _info.Name) |
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_observer.OnNext((T)_info.GetValue(_target)); |
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} |
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public void Dispose() |
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{ |
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_target.PropertyChanged -= OnPropertyChanged; |
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_observer.OnCompleted(); |
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} |
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} |
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public IDisposable Subscribe(IObserver<T> observer) |
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{ |
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return new Subscription(_target, _info, observer); |
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} |
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} |
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public static IObservable<TRes> WhenAnyValue<TModel, TRes>(this TModel model, |
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Expression<Func<TModel, TRes>> expr) where TModel : INotifyPropertyChanged |
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{ |
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var l = (LambdaExpression)expr; |
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var ma = (MemberExpression)l.Body; |
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var prop = (PropertyInfo)ma.Member; |
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return new PropertyObservable<TRes>(model, prop); |
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} |
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public static IObservable<TRes> WhenAnyValue<TModel, T1, TRes>(this TModel model, |
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Expression<Func<TModel, T1>> v1, |
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Func<T1, TRes> cb |
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) where TModel : INotifyPropertyChanged |
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{ |
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return model.WhenAnyValue(v1).Select(cb); |
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} |
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public static IObservable<TRes> WhenAnyValue<TModel, T1, T2, TRes>(this TModel model, |
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Expression<Func<TModel, T1>> v1, |
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Expression<Func<TModel, T2>> v2, |
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Func<T1, T2, TRes> cb |
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) where TModel : INotifyPropertyChanged => |
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Observable.CombineLatest( |
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model.WhenAnyValue(v1), |
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model.WhenAnyValue(v2), |
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cb); |
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public static IObservable<ValueTuple<T1, T2>> WhenAnyValue<TModel, T1, T2>(this TModel model, |
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Expression<Func<TModel, T1>> v1, |
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Expression<Func<TModel, T2>> v2 |
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) where TModel : INotifyPropertyChanged => |
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model.WhenAnyValue(v1, v2, (a1, a2) => (a1, a2)); |
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public static IObservable<TRes> WhenAnyValue<TModel, T1, T2, T3, TRes>(this TModel model, |
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Expression<Func<TModel, T1>> v1, |
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Expression<Func<TModel, T2>> v2, |
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Expression<Func<TModel, T3>> v3, |
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Func<T1, T2, T3, TRes> cb |
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) where TModel : INotifyPropertyChanged => |
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Observable.CombineLatest( |
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model.WhenAnyValue(v1), |
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model.WhenAnyValue(v2), |
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model.WhenAnyValue(v3), |
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cb); |
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public static IObservable<ValueTuple<T1, T2, T3>> WhenAnyValue<TModel, T1, T2, T3>(this TModel model, |
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Expression<Func<TModel, T1>> v1, |
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Expression<Func<TModel, T2>> v2, |
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Expression<Func<TModel, T3>> v3 |
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) where TModel : INotifyPropertyChanged => |
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model.WhenAnyValue(v1, v2, v3, (a1, a2, a3) => (a1, a2, a3)); |
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} |
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} |
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@ -0,0 +1,26 @@ |
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using System.Collections.Generic; |
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using System.ComponentModel; |
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using System.Reactive.Joins; |
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using System.Runtime.CompilerServices; |
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namespace MiniMvvm |
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{ |
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public class ViewModelBase : INotifyPropertyChanged |
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{ |
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public event PropertyChangedEventHandler PropertyChanged; |
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protected bool RaiseAndSetIfChanged<T>(ref T field, T value, [CallerMemberName] string propertyName = null) |
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{ |
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if (!EqualityComparer<T>.Default.Equals(field, value)) |
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{ |
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field = value; |
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RaisePropertyChanged(propertyName); |
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return true; |
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} |
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return false; |
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} |
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protected void RaisePropertyChanged([CallerMemberName] string propertyName = null) |
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=> PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); |
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} |
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} |
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