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using System;
using System.ComponentModel;
namespace Xamarin.Forms
{
public abstract class Effect
{
internal Effect()
{
}
public Element Element { get; internal set; }
public bool IsAttached { get; private set; }
public string ResolveId { get; internal set; }
#region Statics
public static Effect Resolve(string name)
{
Type effectType;
Effect result = null;
if (Registrar.Effects.TryGetValue(name, out effectType))
{
result = (Effect)Activator.CreateInstance(effectType);
}
if (result == null)
result = new NullEffect();
result.ResolveId = name;
return result;
}
#endregion
// Received after Control/Container/Element made valid
protected abstract void OnAttached();
// Received after Control/Container made invalid
protected abstract void OnDetached();
internal virtual void ClearEffect()
{
if (IsAttached)
SendDetached();
Element = null;
}
internal virtual void SendAttached()
{
if (IsAttached)
return;
OnAttached();
IsAttached = true;
}
internal virtual void SendDetached()
{
if (!IsAttached)
return;
OnDetached();
IsAttached = false;
}
internal virtual void SendOnElementPropertyChanged(PropertyChangedEventArgs args)
{
}
}
}
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