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using System;
namespace Xamarin.Forms
{
public abstract class Behavior : BindableObject, IAttachedObject
{
internal Behavior(Type associatedType)
{
if (associatedType == null)
throw new ArgumentNullException("associatedType");
AssociatedType = associatedType;
}
protected Type AssociatedType { get; }
void IAttachedObject.AttachTo(BindableObject bindable)
{
if (bindable == null)
throw new ArgumentNullException("bindable");
if (!AssociatedType.IsInstanceOfType(bindable))
throw new InvalidOperationException("bindable not an instance of AssociatedType");
OnAttachedTo(bindable);
}
void IAttachedObject.DetachFrom(BindableObject bindable)
{
OnDetachingFrom(bindable);
}
protected virtual void OnAttachedTo(BindableObject bindable)
{
}
protected virtual void OnDetachingFrom(BindableObject bindable)
{
}
}
public abstract class Behavior<T> : Behavior where T : BindableObject
{
protected Behavior() : base(typeof(T))
{
}
protected override void OnAttachedTo(BindableObject bindable)
{
base.OnAttachedTo(bindable);
OnAttachedTo((T)bindable);
}
protected virtual void OnAttachedTo(T bindable)
{
}
protected override void OnDetachingFrom(BindableObject bindable)
{
OnDetachingFrom((T)bindable);
base.OnDetachingFrom(bindable);
}
protected virtual void OnDetachingFrom(T bindable)
{
}
}
}
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