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using System;
namespace Xamarin.Forms
{
internal class AnimatableKey
{
public AnimatableKey(IAnimatable animatable, string handle)
{
if (animatable == null)
{
throw new ArgumentNullException(nameof(animatable));
}
if (string.IsNullOrEmpty(handle))
{
throw new ArgumentException("Argument is null or empty", nameof(handle));
}
Animatable = new WeakReference<IAnimatable>(animatable);
Handle = handle;
}
public WeakReference<IAnimatable> Animatable { get; }
public string Handle { get; }
public override bool Equals(object obj)
{
if (ReferenceEquals(null, obj))
{
return false;
}
if (ReferenceEquals(this, obj))
{
return true;
}
if (obj.GetType() != GetType())
{
return false;
}
return Equals((AnimatableKey)obj);
}
public override int GetHashCode()
{
unchecked
{
IAnimatable target;
if (!Animatable.TryGetTarget(out target))
{
return Handle?.GetHashCode() ?? 0;
}
return ((target?.GetHashCode() ?? 0) * 397) ^ (Handle?.GetHashCode() ?? 0);
}
}
protected bool Equals(AnimatableKey other)
{
if (!string.Equals(Handle, other.Handle))
{
return false;
}
IAnimatable thisAnimatable;
if (!Animatable.TryGetTarget(out thisAnimatable))
{
return false;
}
IAnimatable thatAnimatable;
if (!other.Animatable.TryGetTarget(out thatAnimatable))
{
return false;
}
return Equals(thisAnimatable, thatAnimatable);
}
}
}
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