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Resolving Symbolic References in a CodeDOM (Part 7)

, 2 Dec 2012
Resolving symbolic references in a CodeDOM.
Nova.0.6.exe.zip
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Nova.CLI
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Arithmetic
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Base
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Other
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Other
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Types
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Variables
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Base
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Resolving
Utilties
// The Nova Project by Ken Beckett.
// Copyright (C) 2007-2012 Inevitable Software, all rights reserved.
// Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php

using System.Collections.Generic;

namespace Nova.UI
{
    /// <summary>
    /// Used to manage collections of child <see cref="CodeObjectVM"/>s, setting the Parent of
    /// each child object added to the collection.
    /// </summary>
    /// <typeparam name="T">The specific type of objects in the collection (must be <see cref="CodeObjectVM"/> or a derived type).</typeparam>
    public class ChildListVM<T> : List<T> where T : CodeObjectVM
    {
        #region /* FIELDS */

        protected CodeObjectVM ParentVM;

        #endregion

        #region /* CONSTRUCTORS */

        /// <summary>
        /// Create a <see cref="ChildListVM{T}"/>, optionally using a specified parent <see cref="CodeObjectVM"/> object.
        /// </summary>
        public ChildListVM(CodeObjectVM parentVM)
        {
            ParentVM = parentVM;
        }

        #endregion

        #region /* PROPERTIES */

        /// <summary>
        /// The Parent object of the collection.
        /// </summary>
        public CodeObjectVM Parent
        {
            get { return ParentVM; }
        }

        /// <summary>
        /// Get the last item in the collection.
        /// </summary>
        public T Last
        {
            get { return (Count > 0 ? this[Count - 1] : null); }
        }

        #endregion

        #region /* METHODS */

        /// <summary>
        /// Add an item to the collection, setting its Parent.
        /// </summary>
        public new void Add(T item)
        {
            if (item != null)
            {
                //// If any added items already have a parent, and it's not the same as the parent of this collection,
                //// clone them so that we don't end up changing their Parent.  Otherwise, this could happen in many cases,
                //// such as adding an evaluated TypeRef as a type argument, etc.  If code objects are moved (such as drag/drop),
                //// they will be removed first, which will null the Parent reference, then added, avoiding the clone.
                //if (item.Parent != null && item.Parent != ParentVM)
                //    item = (T)item.Clone();
                item.ParentVM = ParentVM;
            }
            base.Add(item);
        }

        /// <summary>
        /// Add a collection of items to the collection, setting their Parents.
        /// </summary>
        public new void AddRange(IEnumerable<T> collection)
        {
            if (collection != null)
            {
                foreach (T item in collection)
                    Add(item);
            }
        }

        /// <summary>
        /// Insert an item into the collection, setting its Parent.
        /// </summary>
        public new void Insert(int index, T item)
        {
            base.Insert(index, item);
            if (item != null)
                item.ParentVM = ParentVM;
        }

        #endregion
    }

    #region /* STATIC HELPER METHODS */

    /// <summary>
    /// Static helper methods for ChildList - used in these cases so that the collection itself can be
    /// checked for being null inside the call.
    /// </summary>
    public static class ChildListHelpers
    {
        /// <summary>
        /// Return the first object in the collection, or null if the collection is null or empty.
        /// </summary>
        public static T First<T>(ChildListVM<T> thisChildList) where T : CodeObjectVM
        {
            return ((thisChildList != null && thisChildList.Count > 0) ? thisChildList[0] : null);
        }

        public static void UnRender<T>(ChildListVM<T> thisChildList) where T : CodeObjectVM
        {
            if (thisChildList != null)
            {
                foreach (T codeObjectVM in thisChildList)
                {
                    if (codeObjectVM != null)
                        codeObjectVM.UnRender();
                }
            }
        }
    }

    #endregion
}

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License

This article, along with any associated source code and files, is licensed under The Common Development and Distribution License (CDDL)

About the Author

KenBeckett
Software Developer (Senior)
United States United States
I've been writing software since the late 70's, currently focusing mainly on C#.NET. I also like to travel around the world, and I own a Chocolate Factory (sadly, none of my employees are oompa loompas).

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