using Cysharp.Threading.Tasks.Internal;
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using System;
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using System.Collections.Generic;
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using System.Threading;
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namespace Cysharp.Threading.Tasks.Linq
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{
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public static partial class UniTaskAsyncEnumerable
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{
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public static IUniTaskAsyncEnumerable<TProperty> EveryValueChanged<TTarget, TProperty>(TTarget target, Func<TTarget, TProperty> propertySelector, PlayerLoopTiming monitorTiming = PlayerLoopTiming.Update, IEqualityComparer<TProperty> equalityComparer = null, bool cancelImmediately = false)
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where TTarget : class
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{
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var unityObject = target as UnityEngine.Object;
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var isUnityObject = target is UnityEngine.Object; // don't use (unityObject == null)
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if (isUnityObject)
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{
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return new EveryValueChangedUnityObject<TTarget, TProperty>(target, propertySelector, equalityComparer ?? UnityEqualityComparer.GetDefault<TProperty>(), monitorTiming, cancelImmediately);
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}
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else
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{
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return new EveryValueChangedStandardObject<TTarget, TProperty>(target, propertySelector, equalityComparer ?? UnityEqualityComparer.GetDefault<TProperty>(), monitorTiming, cancelImmediately);
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}
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}
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}
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internal sealed class EveryValueChangedUnityObject<TTarget, TProperty> : IUniTaskAsyncEnumerable<TProperty>
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{
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readonly TTarget target;
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readonly Func<TTarget, TProperty> propertySelector;
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readonly IEqualityComparer<TProperty> equalityComparer;
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readonly PlayerLoopTiming monitorTiming;
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readonly bool cancelImmediately;
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public EveryValueChangedUnityObject(TTarget target, Func<TTarget, TProperty> propertySelector, IEqualityComparer<TProperty> equalityComparer, PlayerLoopTiming monitorTiming, bool cancelImmediately)
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{
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this.target = target;
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this.propertySelector = propertySelector;
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this.equalityComparer = equalityComparer;
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this.monitorTiming = monitorTiming;
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this.cancelImmediately = cancelImmediately;
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}
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public IUniTaskAsyncEnumerator<TProperty> GetAsyncEnumerator(CancellationToken cancellationToken = default)
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{
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return new _EveryValueChanged(target, propertySelector, equalityComparer, monitorTiming, cancellationToken, cancelImmediately);
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}
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sealed class _EveryValueChanged : MoveNextSource, IUniTaskAsyncEnumerator<TProperty>, IPlayerLoopItem
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{
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readonly TTarget target;
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readonly UnityEngine.Object targetAsUnityObject;
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readonly IEqualityComparer<TProperty> equalityComparer;
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readonly Func<TTarget, TProperty> propertySelector;
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readonly CancellationToken cancellationToken;
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readonly CancellationTokenRegistration cancellationTokenRegistration;
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bool first;
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TProperty currentValue;
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bool disposed;
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public _EveryValueChanged(TTarget target, Func<TTarget, TProperty> propertySelector, IEqualityComparer<TProperty> equalityComparer, PlayerLoopTiming monitorTiming, CancellationToken cancellationToken, bool cancelImmediately)
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{
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this.target = target;
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this.targetAsUnityObject = target as UnityEngine.Object;
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this.propertySelector = propertySelector;
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this.equalityComparer = equalityComparer;
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this.cancellationToken = cancellationToken;
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this.first = true;
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if (cancelImmediately && cancellationToken.CanBeCanceled)
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{
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cancellationTokenRegistration = cancellationToken.RegisterWithoutCaptureExecutionContext(state =>
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{
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var source = (_EveryValueChanged)state;
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source.completionSource.TrySetCanceled(source.cancellationToken);
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}, this);
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}
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TaskTracker.TrackActiveTask(this, 2);
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PlayerLoopHelper.AddAction(monitorTiming, this);
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}
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public TProperty Current => currentValue;
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public UniTask<bool> MoveNextAsync()
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{
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if (disposed) return CompletedTasks.False;
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completionSource.Reset();
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if (cancellationToken.IsCancellationRequested)
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{
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completionSource.TrySetCanceled(cancellationToken);
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return new UniTask<bool>(this, completionSource.Version);
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}
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if (first)
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{
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first = false;
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if (targetAsUnityObject == null)
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{
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return CompletedTasks.False;
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}
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this.currentValue = propertySelector(target);
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return CompletedTasks.True;
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}
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return new UniTask<bool>(this, completionSource.Version);
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}
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public UniTask DisposeAsync()
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{
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if (!disposed)
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{
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cancellationTokenRegistration.Dispose();
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disposed = true;
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TaskTracker.RemoveTracking(this);
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}
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return default;
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}
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public bool MoveNext()
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{
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if (disposed || targetAsUnityObject == null)
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{
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completionSource.TrySetResult(false);
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DisposeAsync().Forget();
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return false;
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}
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if (cancellationToken.IsCancellationRequested)
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{
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completionSource.TrySetCanceled(cancellationToken);
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return false;
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}
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TProperty nextValue = default(TProperty);
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try
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{
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nextValue = propertySelector(target);
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if (equalityComparer.Equals(currentValue, nextValue))
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{
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return true;
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}
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}
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catch (Exception ex)
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{
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completionSource.TrySetException(ex);
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DisposeAsync().Forget();
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return false;
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}
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currentValue = nextValue;
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completionSource.TrySetResult(true);
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return true;
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}
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}
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}
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internal sealed class EveryValueChangedStandardObject<TTarget, TProperty> : IUniTaskAsyncEnumerable<TProperty>
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where TTarget : class
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{
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readonly WeakReference<TTarget> target;
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readonly Func<TTarget, TProperty> propertySelector;
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readonly IEqualityComparer<TProperty> equalityComparer;
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readonly PlayerLoopTiming monitorTiming;
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readonly bool cancelImmediately;
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public EveryValueChangedStandardObject(TTarget target, Func<TTarget, TProperty> propertySelector, IEqualityComparer<TProperty> equalityComparer, PlayerLoopTiming monitorTiming, bool cancelImmediately)
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{
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this.target = new WeakReference<TTarget>(target, false);
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this.propertySelector = propertySelector;
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this.equalityComparer = equalityComparer;
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this.monitorTiming = monitorTiming;
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this.cancelImmediately = cancelImmediately;
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}
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public IUniTaskAsyncEnumerator<TProperty> GetAsyncEnumerator(CancellationToken cancellationToken = default)
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{
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return new _EveryValueChanged(target, propertySelector, equalityComparer, monitorTiming, cancellationToken, cancelImmediately);
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}
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sealed class _EveryValueChanged : MoveNextSource, IUniTaskAsyncEnumerator<TProperty>, IPlayerLoopItem
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{
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readonly WeakReference<TTarget> target;
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readonly IEqualityComparer<TProperty> equalityComparer;
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readonly Func<TTarget, TProperty> propertySelector;
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readonly CancellationToken cancellationToken;
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readonly CancellationTokenRegistration cancellationTokenRegistration;
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bool first;
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TProperty currentValue;
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bool disposed;
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public _EveryValueChanged(WeakReference<TTarget> target, Func<TTarget, TProperty> propertySelector, IEqualityComparer<TProperty> equalityComparer, PlayerLoopTiming monitorTiming, CancellationToken cancellationToken, bool cancelImmediately)
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{
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this.target = target;
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this.propertySelector = propertySelector;
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this.equalityComparer = equalityComparer;
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this.cancellationToken = cancellationToken;
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this.first = true;
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if (cancelImmediately && cancellationToken.CanBeCanceled)
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{
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cancellationTokenRegistration = cancellationToken.RegisterWithoutCaptureExecutionContext(state =>
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{
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var source = (_EveryValueChanged)state;
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source.completionSource.TrySetCanceled(source.cancellationToken);
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}, this);
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}
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TaskTracker.TrackActiveTask(this, 2);
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PlayerLoopHelper.AddAction(monitorTiming, this);
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}
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public TProperty Current => currentValue;
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public UniTask<bool> MoveNextAsync()
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{
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if (disposed) return CompletedTasks.False;
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completionSource.Reset();
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if (cancellationToken.IsCancellationRequested)
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{
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completionSource.TrySetCanceled(cancellationToken);
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return new UniTask<bool>(this, completionSource.Version);
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}
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if (first)
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{
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first = false;
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if (!target.TryGetTarget(out var t))
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{
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return CompletedTasks.False;
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}
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this.currentValue = propertySelector(t);
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return CompletedTasks.True;
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}
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return new UniTask<bool>(this, completionSource.Version);
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}
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public UniTask DisposeAsync()
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{
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if (!disposed)
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{
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cancellationTokenRegistration.Dispose();
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disposed = true;
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TaskTracker.RemoveTracking(this);
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}
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return default;
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}
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public bool MoveNext()
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{
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if (disposed || !target.TryGetTarget(out var t))
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{
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completionSource.TrySetResult(false);
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DisposeAsync().Forget();
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return false;
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}
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if (cancellationToken.IsCancellationRequested)
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{
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completionSource.TrySetCanceled(cancellationToken);
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return false;
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}
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TProperty nextValue = default(TProperty);
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try
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{
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nextValue = propertySelector(t);
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if (equalityComparer.Equals(currentValue, nextValue))
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{
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return true;
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}
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}
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catch (Exception ex)
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{
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completionSource.TrySetException(ex);
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DisposeAsync().Forget();
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return false;
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}
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currentValue = nextValue;
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completionSource.TrySetResult(true);
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return true;
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}
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}
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}
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}
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