101 lines
3.1 KiB
C#
101 lines
3.1 KiB
C#
/*
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Copyright (c) 2003-2006 Niels Kokholm and Peter Sestoft
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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using System;
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using System.Diagnostics;
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using SCG = System.Collections.Generic;
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namespace C5
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{
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/// <summary>
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/// Characterize the mutual position of some view B (other) relative to view A (this)
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/// </summary>
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enum MutualViewPosition
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{
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/// <summary>
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/// B contains A(this)
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/// </summary>
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Contains,
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/// <summary>
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/// B is containd in A(this), but not vice versa
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/// </summary>
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ContainedIn,
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/// <summary>
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/// A and B does not overlap
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/// </summary>
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NonOverlapping,
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/// <summary>
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/// A and B overlap, but neither is contained in the other
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/// </summary>
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Overlapping
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}
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#region View List Nested class
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/// <summary>
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/// This class is shared between the linked list and array list implementations.
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/// </summary>
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/// <typeparam name="V"></typeparam>
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[Serializable]
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class WeakViewList<V> where V : class
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{
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Node start;
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[Serializable]
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internal class Node
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{
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internal WeakReference weakview; internal Node prev, next;
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internal Node(V view) { weakview = new WeakReference(view); }
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}
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internal Node Add(V view)
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{
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Node newNode = new Node(view);
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if (start != null) { start.prev = newNode; newNode.next = start; }
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start = newNode;
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return newNode;
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}
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internal void Remove(Node n)
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{
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if (n == start) { start = start.next; if (start != null) start.prev = null; }
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else { n.prev.next = n.next; if (n.next != null) n.next.prev = n.prev; }
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}
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/// <summary>
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/// Note that it is safe to call views.Remove(view.myWeakReference) if view
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/// is the currently yielded object
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/// </summary>
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/// <returns></returns>
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public SCG.IEnumerator<V> GetEnumerator()
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{
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Node n = start;
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while (n != null)
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{
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//V view = n.weakview.Target as V; //This provokes a bug in the beta1 verifyer
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object o = n.weakview.Target;
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V view = o is V ? (V)o : null;
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if (view == null)
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Remove(n);
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else
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yield return view;
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n = n.next;
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}
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}
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}
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#endregion
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} |