HKW.ReactiveUI 0.4.7

HKW.ReactiveUI

An MVVM library, based on ReactiveUI, using SourceGenerator and Fody for mixed source code generation.

ReactivePropertyAttribute

Adding Notifications to Properties Using Fody and SourceGenerator

partial class MyViewModel : ReactiveObject
{
 [ReactiveProperty]
 public string Name { get; set; } = string.Empty;
}

Generated code

partial class MyViewModel : ReactiveObject
{
 private string $Name;

 [ReactiveProperty]
 public string Name
 {
 get => $Name;
 set => RaiseAndSetName(ref $Name, value, true);
 }

 private void RaiseAndSetName(ref string backingField, string newValue, bool check = true)
 {
 if (!check || !EqualityComparer<string>.Default.Equals(backingField, newValue))
 {
 string oldValue = backingField;
 this.RaisePropertyChanging("Name");
 OnNameChanging(oldValue, newValue);
 backingField = newValue;
 this.RaisePropertyChanged("Name");
 OnNameChanged(oldValue, newValue);
 }
 }
}

ReactiveCommandAttribute

Adding Command Properties to Methods Using the Source Generator

partial class MyViewModel : ReactiveObject
{
 [ReactiveCommand]
 public void Test() { }

 [ReactiveCommand]
 public async Task TestAsync() { }
}

Generated code

partial class MyViewModel : ReactiveObject
{
 private ReactiveCommand<Unit, Unit> _testCommand;
 public ReactiveCommand<Unit, Unit> TestCommand =>
 _testCommand ?? (_testCommand = ReactiveCommand.Create(Test));
 private ReactiveCommand<Unit, Unit> _testAsyncCommand;
 public ReactiveCommand<Unit, Unit> Test1AsyncCommand =>
 _testAsyncCommand ?? (_testAsyncCommand = ReactiveCommand.CreateFromTask(TestAsync));

 [ReactiveCommand]
 public void Test() { }

 [ReactiveCommand]
 public async Task TestAsync() { }
}

NotifyPropertyChangeFromAttribute

Notify property when target property changed
A field is generated to cache the value when EnableCache is true

partial class MyViewModel : ReactiveObject
{
 [NotifyPropertyChangeFrom(nameof(ID), nameof(Name))]
 public bool IsSame => ID == Name;
 protected void InitializeReactiveObject() { }
}

Generated code

partial class MyViewModel : ReactiveObject
{
 private bool _isSame;
 [NotifyPropertyChangeFrom(nameof(ID), nameof(Name))]
 public bool IsSame => _isSame;

 protected void InitializeReactiveObject()
 {
 // InitializeInInitializeObject = true
 _isSame = Name == ID;
 }
 protected void RaiseIsSameChange()
 {
 this.RaiseAndSetIfChanged(ref _isSame, Name == ID, "IsSame");
 }
 private void RaiseAndSetName(ref string backingField, string newValue, bool check = true)
 {
 ...
 this.RaisePropertyChanged("Name");
 RaiseIsSameChange();
 }
 private void RaiseAndSetID(ref string backingField, string newValue, bool check = true)
 {
 ...
 this.RaisePropertyChanged("ID");
 RaiseIsSameChange();
 }
}

When EnableCache is false

partial class MyViewModel : ReactiveObject
{
 [NotifyPropertyChangeFrom(nameof(ID), nameof(Name), EnableCache = false)]
 public bool IsSame => ID == Name;
 protected void InitializeReactiveObject() { }
}

Generated code

partial class MyViewModel : ReactiveObject
{
 private bool _isSame;
 [NotifyPropertyChangeFrom(nameof(ID), nameof(Name), EnableCache = false)]
 public bool IsSame => Name == ID;

 protected void InitializeReactiveObject()
 {
 // InitializeInInitializeObject = true
 _isSame = Name == ID;
 }
 protected void RaiseIsSameChange()
 {
 this.RaiseAndSetIfChanged(ref _isSame, Name == ID, "IsSame");
 }
 private void RaiseAndSetName(ref string backingField, string newValue, bool check = true)
 {
 ...
 this.RaisePropertyChanging("Name");
 this.RaisePropertyChanging("IsSame");
 backingField = newValue;
 this.RaisePropertyChanged("Name");
 this.RaisePropertyChanged("IsSame");
 ...
 }
 private void RaiseAndSetID(ref string backingField, string newValue, bool check = true)
 {
 ...
 this.RaisePropertyChanging("ID");
 this.RaisePropertyChanging("IsSame");
 backingField = newValue;
 this.RaisePropertyChanged("ID");
 this.RaisePropertyChanged("IsSame");
 ...
 }
}