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// 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;
}
}
}
}
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