CollectionChange.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / Model / CollectionChange.cs / 1305376 / CollectionChange.cs
                        

                        
                            //---------------------------------------------------------------- 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//---------------------------------------------------------------

namespace System.Activities.Presentation.Model 
{
    using System.Runtime; 
 
    class CollectionChange : ModelChange
    { 
        public ModelItemCollection Collection { get; set; }

        public int Index { get; set; }
 
        public ModelItem Item { get; set; }
 
        public OperationType Operation { get; set; } 

        public ModelTreeManager ModelTreeManager { get; set; } 

        public override string Description
        {
            get 
            {
                return this.Operation == OperationType.Insert ? SR.CollectionAddEditingScopeDescription : SR.CollectionRemoveEditingScopeDescription; 
            } 
        }
 
        public override bool Apply()
        {
            switch (this.Operation)
            { 
                case OperationType.Insert:
                    ApplyInsert(); 
                    break; 
                case OperationType.Delete:
                    ApplyDelete(); 
                    break;
                default:
                    Fx.Assert("Operation should be Insert or Delete");
                    break; 

            } 
            return true; 
        }
 
        private void ApplyDelete()
        {
            Fx.Assert(this.ModelTreeManager != null, "ModelTreeManager cannot be null.");
            Fx.Assert(this.Collection != null, "this.Collection cannot be null."); 
            if (this.Index >= 0)
            { 
                ((ModelItemCollectionImpl)this.Collection).RemoveAtCore(this.Index); 
            }
            else 
            {
                Fx.Assert(this.Index == -1, "-1 must be used to indicate Remove(item)");
                this.Index = this.Collection.IndexOf(this.Item);
                ((ModelItemCollectionImpl)this.Collection).RemoveCore(this.Item); 
            }
 
            // if no more this.Item exists in this.Collection, then this.Item should be released from the ModelTree. 
            if (this.Collection.IndexOf(this.Item) == -1)
            { 
                ((IModelTreeItem)this.Item).RemoveParent(this.Collection);
                this.ModelTreeManager.ReleaseModelItem(this.Item, this.Collection);
            }
            this.ModelTreeManager.NotifyCollectionRemove(this.Item); 
        }
 
        private void ApplyInsert() 
        {
            Fx.Assert(this.ModelTreeManager != null, "ModelTreeManager cannot be null."); 
            Fx.Assert(this.Collection != null, "this.Collection cannot be null.");
            this.ModelTreeManager.ReAddModelItemToModelTree(this.Item);
            if (this.Index >= 0)
            { 
                ((ModelItemCollectionImpl)this.Collection).InsertCore(this.Index, this.Item);
            } 
            else 
            {
                Fx.Assert(this.Index == -1, "-1 must be used to indicate Add(item)"); 
                this.Index = this.Collection.Count;
                ((ModelItemCollectionImpl)this.Collection).AddCore(this.Item);
            }
            this.ModelTreeManager.NotifyCollectionInsert(this.Item); 
        }
 
        public override Change GetInverse() 
        {
            OperationType reverseOperation = this.Operation == OperationType.Insert ? OperationType.Delete : OperationType.Insert; 
            return new CollectionChange()
                {
                    Collection = this.Collection,
                    Operation = reverseOperation, 
                    Item = this.Item,
                    ModelTreeManager = this.ModelTreeManager, 
                    Index = this.Index 
                };
 
        }

        public enum OperationType
        { 
            Insert, Delete
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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