https://github.com/weingartner/reactivecompositecollections

A .Net library for composing reactive collections.
https://github.com/weingartner/reactivecompositecollections

dotnet linq monad reactive reactiveui

Last synced: 29 days ago
JSON representation

A .Net library for composing reactive collections.

• Host: GitHub
• URL: https://github.com/weingartner/reactivecompositecollections
• Owner: Weingartner
• License: mit
• Created: 2015-11-25T08:56:47.000Z (almost 9 years ago)
• Default Branch: master
• Last Pushed: 2022-09-14T11:38:48.000Z (about 2 years ago)
• Last Synced: 2024-10-10T22:21:05.795Z (29 days ago)
• Topics: dotnet, linq, monad, reactive, reactiveui
• Language: C#
• Size: 1.59 MB
• Stars: 20
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
# ReactiveCompositeCollections [![NuGet](https://img.shields.io/nuget/v/ReactiveCompositeCollections.svg?maxAge=2592000)](https://www.nuget.org/packages/ReactiveCompositeCollections/)

A .Net library for composing reactive collections providing monadic types to support LINQ.

## Motivation 

We often have heirachical components that maintain collections of things. Imagine a collection of 3D objects that

all produce lines. The 3D objects could be arranged in nested components. What we want is to be able to collect all

the lines in the heirarchy as a flat reactive object

    CompositeSourceList> nestedLines = new CompositeSourceList>();

    

    Widget wa = new Widget();

    Widget wb = new Widget();

    

    nestedLines.Add(wa.Lines);

    nestedLines.Add(wa.Lines);

    

    ICompositeList allLines = 

                   from lines in nestedLines

                   from line in lines

                   select line;

                   

    // Subscribe the the stream of flattened lines               

    allLines.Items.Subscribe((ImmutableList lines)=>RenderLines(lines));

    

    // or create an INPC object with a property Items

    using(var s = allLines.Subscribe()){

       RenderLines(s.Items);

    }

## Using ICompositeCollection with WPF.

To use the ICompositeCollectin you need to convert it to a ReadOnlyObservableCollection via the following method.

        [Fact]

        public void ShouldWorkWithRangeOperators()

        {

            var source0 = new CompositeSourceList();

            var source1 = new CompositeSourceList();

            var target = source0.Concat(source1);

            using (var observableCollection = target.CreateObservableCollection(EqualityComparer.Default))

            {

                observableCollection.Count.Should().Be(0);

                source0.AddRange(new [] {0,1,2});

                observableCollection.Should().Equal(0, 1,2);

                source0.Add(1);

                source1.Add(6);

                observableCollection.Should().Equal(0, 1, 2, 1, 6);

                source1.AddRange(new [] {3,4,5});

                observableCollection.Should().Equal(0, 1, 2, 1, 6, 3, 4, 5);

                source0.InsertRangeAt(1, new [] {6,7});

                observableCollection.Should().Equal(0, 6, 7, 1, 2, 1, 6, 3, 4, 5);

                source1.InsertRangeAt(1, new [] {6,7});

                observableCollection.Should().Equal(0, 6, 7, 1, 2, 1, 6, 6, 7, 3, 4, 5);

                source0.Source.Should().Equal(0, 6, 7, 1, 2,1);

                source0.Replace(1,99);

                observableCollection.Should().Equal(0, 6, 7, 99, 2, 1, 6, 6, 7, 3, 4, 5);

            }

        }

Note that the ReadOnlyObservableCollection is IDisposable so you should get rid of it when you don't need

it anymore.