Merge branch 'master' of https://twinetfs.visualstudio.com/Tango/_git/Tango

1 files changed, 86 insertions, 0 deletions

diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/WeakEventManagerBase.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/WeakEventManagerBase.cs
new file mode 100644
index 000000000..87e4de515
--- /dev/null
+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/WeakEventManagerBase.cs
@@ -0,0 +1,86 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Diagnostics;
+using System.Windows;
+
+namespace Tango.Scripting.Editors.Utils
+{
+	/// <summary>
+	/// WeakEventManager with AddListener/RemoveListener and CurrentManager implementation.
+	/// Helps implementing the WeakEventManager pattern with less code.
+	/// </summary>
+	public abstract class WeakEventManagerBase<TManager, TEventSource> : WeakEventManager
+		where TManager : WeakEventManagerBase<TManager, TEventSource>, new()
+		where TEventSource : class
+	{
+		/// <summary>
+		/// Creates a new WeakEventManagerBase instance.
+		/// </summary>
+		protected WeakEventManagerBase()
+		{
+			Debug.Assert(GetType() == typeof(TManager));
+		}
+		
+		/// <summary>
+		/// Adds a weak event listener.
+		/// </summary>
+		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1000:DoNotDeclareStaticMembersOnGenericTypes")]
+		public static void AddListener(TEventSource source, IWeakEventListener listener)
+		{
+			CurrentManager.ProtectedAddListener(source, listener);
+		}
+		
+		/// <summary>
+		/// Removes a weak event listener.
+		/// </summary>
+		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1000:DoNotDeclareStaticMembersOnGenericTypes")]
+		public static void RemoveListener(TEventSource source, IWeakEventListener listener)
+		{
+			CurrentManager.ProtectedRemoveListener(source, listener);
+		}
+		
+		/// <inheritdoc/>
+		protected sealed override void StartListening(object source)
+		{
+			if (source == null)
+				throw new ArgumentNullException("source");
+			StartListening((TEventSource)source);
+		}
+		
+		/// <inheritdoc/>
+		protected sealed override void StopListening(object source)
+		{
+			if (source == null)
+				throw new ArgumentNullException("source");
+			StopListening((TEventSource)source);
+		}
+		
+		/// <summary>
+		/// Attaches the event handler.
+		/// </summary>
+		protected abstract void StartListening(TEventSource source);
+		
+		/// <summary>
+		/// Detaches the event handler.
+		/// </summary>
+		protected abstract void StopListening(TEventSource source);
+		
+		/// <summary>
+		/// Gets the current manager.
+		/// </summary>
+		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1721:PropertyNamesShouldNotMatchGetMethods")]
+		protected static TManager CurrentManager {
+			get {
+				Type managerType = typeof(TManager);
+				TManager manager = (TManager)GetCurrentManager(managerType);
+				if (manager == null) {
+					manager = new TManager();
+					SetCurrentManager(managerType, manager);
+				}
+				return manager;
+			}
+		}
+	}
+}