39 lines
1.3 KiB
C#
39 lines
1.3 KiB
C#
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using System;
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using System.Collections.Generic;
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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="ParentType">Type of the parent object</typeparam>
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public class Parentable<ParentType>
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where ParentType : class {
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/// <summary>Assigns a new parent to this instance</summary>
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internal void SetParent(ParentType parent) {
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ParentType 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>The parent object that owns this instance</summary>
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protected ParentType 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(ParentType oldParent) { }
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/// <summary>Current parent of this object</summary>
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private ParentType parent;
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}
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} // namespace Nuclex.Support.Collections
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