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-rw-r--r--Xamarin.Forms.Core/Effect.cs70
1 files changed, 70 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core/Effect.cs b/Xamarin.Forms.Core/Effect.cs
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+++ b/Xamarin.Forms.Core/Effect.cs
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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)
+ {
+ }
+ }
+} \ No newline at end of file