56 lines
1.8 KiB
C#
56 lines
1.8 KiB
C#
#region Apache License 2.0
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/*
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Nuclex .NET Framework
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Copyright (C) 2002-2024 Markus Ewald / Nuclex Development Labs
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#endregion // Apache License 2.0
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using System;
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namespace Nuclex.Support.Collections {
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/// <summary>Base class for objects that can be parented to an owner</summary>
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/// <typeparam name="TParent">Type of the parent object</typeparam>
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public class Parentable<TParent> {
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/// <summary>The parent object that owns this instance</summary>
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protected TParent Parent {
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get { return this.parent; }
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}
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/// <summary>Invoked whenever the instance's owner changes</summary>
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/// <remarks>
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/// When items are parented for the first time, the oldParent argument will
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/// be null. Also, if the element is removed from the collection, the
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/// current parent will be null.
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/// </remarks>
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/// <param name="oldParent">Previous owner of the instance</param>
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protected virtual void OnParentChanged(TParent oldParent) { }
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/// <summary>Assigns a new parent to this instance</summary>
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internal void SetParent(TParent parent) {
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TParent oldParent = this.parent;
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this.parent = parent;
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OnParentChanged(oldParent);
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}
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/// <summary>Current parent of this object</summary>
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private TParent parent;
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}
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} // namespace Nuclex.Support.Collections
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