// 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 ICSharpCode.AvalonEdit.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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