ModelItemCollectionImpl.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Presentation / System / Activities / Presentation / Model / ModelItemCollectionImpl.cs / 1305376 / ModelItemCollectionImpl.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.Activities.Presentation.Model 
{
    using System.Collections; 
    using System.Collections.Generic; 
    using System.Collections.Specialized;
    using System.ComponentModel; 
    using System.Diagnostics;
    using System.Windows;
    using System.Windows.Markup;
    using System.Activities.Presentation.Services; 
    using System.Linq;
    using System.Runtime; 
 
    // This class provides the implementation for the ModelItemCollection. This provides
    // a container for the child modelItems for the entries in a collection. 

    class ModelItemCollectionImpl : ModelItemCollection, IModelTreeItem
    {
        ModelProperty contentProperty; 
        object instance;
        Type itemType; 
        List modelItems; 
        Dictionary modelPropertyStore;
        ModelTreeManager modelTreeManager; 
        ModelProperty nameProperty;
        List parents;
        ModelPropertyCollectionImpl properties;
        List sources; 
        List subTreeNodesThatNeedBackLinkPatching;
        DependencyObject view; 
 
        public ModelItemCollectionImpl(ModelTreeManager modelTreeManager, Type itemType, Object instance, ModelItem parent)
        { 
            Fx.Assert(modelTreeManager != null, "modelTreeManager cannot be null");
            Fx.Assert(itemType != null, "item type cannot be null");
            Fx.Assert(instance != null, "instance cannot be null");
            this.itemType = itemType; 
            this.instance = instance;
            this.modelTreeManager = modelTreeManager; 
            this.parents = new List(1); 
            this.sources = new List(1);
            if (parent != null) 
            {
                this.parents.Add(parent);
            }
            this.modelPropertyStore = new Dictionary(); 
            this.subTreeNodesThatNeedBackLinkPatching = new List();
            this.modelItems = new List(); 
            UpdateInstance(instance); 
        }
 
        public override event NotifyCollectionChangedEventHandler CollectionChanged;

        public override event PropertyChangedEventHandler PropertyChanged;
 
        public override AttributeCollection Attributes
        { 
            get 
            {
                Fx.Assert(this.itemType != null, "item type cannot be null"); 
                return TypeDescriptor.GetAttributes(this.itemType);
            }
        }
 
        public override ModelProperty Content
        { 
            get 
            {
                if (this.contentProperty == null) 
                {
                    Fx.Assert(this.instance != null, "instance cannot be null");
                    ContentPropertyAttribute contentAttribute = TypeDescriptor.GetAttributes(this.instance)[typeof(ContentPropertyAttribute)] as ContentPropertyAttribute;
                    if (contentAttribute != null && !String.IsNullOrEmpty(contentAttribute.Name)) 
                    {
                        this.contentProperty = this.Properties.Find(contentAttribute.Name); 
                    } 
                }
                return contentProperty; 
            }
        }

        public override int Count 
        {
            get 
            { 
                Fx.Assert(instance != null, "instance cannot be null");
                if (instance != null) 
                {
                    return ((ICollection)instance).Count;
                }
                return 0; 
            }
        } 
 
        public override bool IsReadOnly
        { 
            get
            {
                IList instanceList = instance as IList;
                Fx.Assert(instanceList != null, "instance should be IList"); 
                return instanceList.IsReadOnly;
            } 
        } 

        public override Type ItemType 
        {
            get
            {
                return this.itemType; 
            }
        } 
 
        public override string Name
        { 
            get
            {
                string name = null;
                if ((this.NameProperty != null) && (this.NameProperty.Value != null)) 
                {
                    name = (string)this.NameProperty.Value.GetCurrentValue(); 
                } 
                return name;
            } 
            set
            {
                this.NameProperty.SetValue(value);
            } 
        }
 
        public override ModelItem Parent 
        {
            get 
            {
                return (this.Parents.Count() > 0) ? this.Parents.First() : null;
            }
 
        }
 
        public override ModelPropertyCollection Properties 
        {
            get 
            {
                if (this.properties == null)
                {
                    properties = new ModelPropertyCollectionImpl(this); 
                }
                return properties; 
            } 
        }
 
        public override ModelItem Root
        {
            get
            { 
                return this.modelTreeManager.Root;
            } 
        } 

        public override ModelProperty Source 
        {
            get
            {
                return (this.sources.Count > 0) ? this.sources.First() : null; 
            }
        } 
 
        public override DependencyObject View
        { 
            get
            {
                return this.view;
            } 
        }
 
        public override IEnumerable Parents 
        {
            get 
            {
                return this.parents.Concat(
                    from source in this.sources
                    select source.Parent); 
            }
        } 
 
        public override IEnumerable Sources
        { 
            get
            {
                return this.sources;
            } 
        }
 
        internal List Items 
        {
            get 
            {
                return modelItems;
            }
        } 

        internal Dictionary ModelPropertyStore 
        { 
            get
            { 
                return modelPropertyStore;
            }
        }
 
        protected ModelProperty NameProperty
        { 
            get 
            {
                if (this.nameProperty == null) 
                {
                    Fx.Assert(this.instance != null, "instance cannot be null");
                    RuntimeNamePropertyAttribute runtimeNamePropertyAttribute = TypeDescriptor.GetAttributes(this.instance)[typeof(RuntimeNamePropertyAttribute)] as RuntimeNamePropertyAttribute;
                    if (runtimeNamePropertyAttribute != null && !String.IsNullOrEmpty(runtimeNamePropertyAttribute.Name)) 
                    {
                        this.nameProperty = this.Properties.Find(runtimeNamePropertyAttribute.Name); 
                    } 
                }
                return nameProperty; 
            }
        }

        ModelItem IModelTreeItem.ModelItem 
        {
            get 
            { 
                return this;
            } 
        }

        Dictionary IModelTreeItem.ModelPropertyStore
        { 
            get
            { 
                return modelPropertyStore; 
            }
        } 


        ModelTreeManager IModelTreeItem.ModelTreeManager
        { 
            get
            { 
                return modelTreeManager; 
            }
        } 

        public override ModelItem this[int index]
        {
            get 
            {
                return this.modelItems[index]; 
            } 
            set
            { 
                this.Insert(index, value);
            }
        }
 
        public void SetCurrentView(DependencyObject view)
        { 
            this.view = view; 
        }
 
        public override ModelItem Add(object value)
        {
            ModelItem item = value as ModelItem;
            if (item == null) 
            {
                item = this.modelTreeManager.WrapAsModelItem(this, value); 
            } 
            if (item == null)
            { 
                throw FxTrace.Exception.AsError(new ArgumentNullException("value"));
            }
            Add(item);
            return item; 
        }
 
        public override void Add(ModelItem item) 
        {
            if (item == null) 
            {
                throw FxTrace.Exception.AsError(new ArgumentNullException("item"));
            }
            this.modelTreeManager.CollectionAdd(this, item); 
        }
 
 
        public override ModelEditingScope BeginEdit(string description)
        { 
            return this.modelTreeManager.CreateEditingScope(description);
        }

        public override ModelEditingScope BeginEdit() 
        {
            return this.BeginEdit(null); 
        } 

 
        public override void Clear()
        {
            if (!this.IsReadOnly && (this.modelItems.Count > 0))
            { 
                this.modelTreeManager.CollectionClear(this);
            } 
        } 

        public override bool Contains(object value) 
        {
            ModelItem item = value as ModelItem;
            if (item == null)
            { 
                return ((IList)instance).Contains(value);
            } 
            return Contains(item); 
        }
 
        public override bool Contains(ModelItem item)
        {
            return this.Items.Contains(item);
        } 

        public override void CopyTo(ModelItem[] array, int arrayIndex) 
        { 
            if (array == null)
            { 
                throw FxTrace.Exception.AsError(new ArgumentNullException("array"));
            }
            if (this.Items != null)
            { 
                this.Items.CopyTo(array, arrayIndex);
            } 
        } 

        public override object GetCurrentValue() 
        {
            return this.instance;
        }
 
        public override IEnumerator GetEnumerator()
        { 
            foreach (ModelItem modelItem in modelItems) 
            {
                yield return modelItem; 
            }
        }

        void IModelTreeItem.OnPropertyChanged(string propertyName) 
        {
            if (PropertyChanged != null) 
            { 
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            } 
        }

        void IModelTreeItem.SetParent(ModelItem dataModelItem)
        { 
            if (!this.parents.Contains(dataModelItem))
            { 
                this.parents.Add(dataModelItem); 
            }
        } 

        void IModelTreeItem.SetSource(ModelProperty property)
        {
            if (!this.sources.Contains(property)) 
            {
                // also check if the same parent.property is in the list as a different instance of oldModelProperty 
                ModelProperty foundProperty = this.sources.Find((modelProperty) => modelProperty.Name.Equals(property.Name) && property.Parent == modelProperty.Parent); 
                if (foundProperty == null)
                { 
                    this.sources.Add(property);
                }
            }
        } 

        IList IModelTreeItem.SubNodesThatNeedBackLinkUpdate 
        { 
            get
            { 
                return this.subTreeNodesThatNeedBackLinkPatching;
            }
        }
 
        public override int IndexOf(ModelItem item)
        { 
            if (item == null) 
            {
                throw FxTrace.Exception.AsError(new ArgumentNullException("item")); 
            }
            return this.modelItems.IndexOf(item);
        }
 
        public override ModelItem Insert(int index, object value)
        { 
            ModelItem item = value as ModelItem; 
            if (item == null)
            { 
                item = this.modelTreeManager.WrapAsModelItem(this, value);
            }
            if (item == null)
            { 
                throw FxTrace.Exception.AsError(new ArgumentNullException("value"));
            } 
            Insert(index, item); 
            return item;
        } 

        public override void Insert(int index, ModelItem item)
        {
            if (item == null) 
            {
                throw FxTrace.Exception.AsError(new ArgumentNullException("item")); 
            } 
            this.modelTreeManager.CollectionInsert(this, index, item);
        } 

        public override void Move(int fromIndex, int toIndex)
        {
            if (fromIndex > this.Items.Count) 
            {
                throw FxTrace.Exception.AsError(new ArgumentOutOfRangeException("fromIndex")); 
            } 
            if (toIndex > this.Items.Count)
            { 
                throw FxTrace.Exception.AsError(new ArgumentOutOfRangeException("toIndex"));
            }
            ModelItem movingItem = this.Items[fromIndex];
            this.RemoveAt(fromIndex); 
            this.Insert(toIndex, movingItem);
        } 
 
        public override bool Remove(object value)
        { 
            ModelItem item = value as ModelItem;
            if (item == null)
            {
                Fx.Assert(this.Items != null, "Items collection is null when trying to iterate over it"); 
                foreach (ModelItem childItem in this.Items)
                { 
                    if (childItem.GetCurrentValue() == value) 
                    {
                        item = childItem; 
                        break;
                    }
                }
                if (item == null) 
                {
                    return false; 
                } 
            }
            return Remove(item); 
        }

        public override bool Remove(ModelItem item)
        { 
            this.modelTreeManager.CollectionRemove(this, item);
            return true; 
        } 

        public override void RemoveAt(int index) 
        {
            if (index >= this.Count)
            {
                throw FxTrace.Exception.AsError(new ArgumentOutOfRangeException("index")); 
            }
            this.modelTreeManager.CollectionRemoveAt(this, index); 
        } 

 

        internal void AddCore(ModelItem item)
        {
            Fx.Assert(instance is IList, "instance should be IList"); 
            Fx.Assert(instance != null, "instance should not be null");
            IList instanceList = (IList)instance; 
            instanceList.Add(item.GetCurrentValue()); 
            ((IModelTreeItem)item).SetParent(this);
            this.modelItems.Add(item); 
            if (this.PropertyChanged != null)
            {
                this.PropertyChanged(this, new PropertyChangedEventArgs("Count"));
            } 
            if (this.CollectionChanged != null)
            { 
                this.CollectionChanged(this, new System.Collections.Specialized.NotifyCollectionChangedEventArgs(System.Collections.Specialized.NotifyCollectionChangedAction.Add, item, this.Count - 1)); 
            }
        } 



        internal void ClearCore() 
        {
            Fx.Assert(instance is IList, " Instance needs to be Ilist for clear to work"); 
            Fx.Assert(instance != null, "Instance should not be null"); 
            this.modelItems.Clear();
            IList instanceList = (IList)instance; 
            instanceList.Clear();
            if (this.PropertyChanged != null)
            {
                this.PropertyChanged(this, new PropertyChangedEventArgs("Count")); 
            }
        } 
 

        internal void InsertCore(int index, ModelItem item) 
        {
            Fx.Assert(instance is IList, "instance needs to be IList");
            Fx.Assert(instance != null, "instance should not be null");
            IList instanceList = (IList)instance; 
            instanceList.Insert(index, item.GetCurrentValue());
 
            ((IModelTreeItem)item).SetParent(this); 

            this.modelItems.Insert(index, item); 
            if (this.PropertyChanged != null)
            {
                this.PropertyChanged(this, new PropertyChangedEventArgs("Count"));
            } 
            if (this.CollectionChanged != null)
            { 
                this.CollectionChanged(this, new System.Collections.Specialized.NotifyCollectionChangedEventArgs(System.Collections.Specialized.NotifyCollectionChangedAction.Add, item, index)); 
            }
        } 

        internal void RemoveCore(ModelItem item)
        {
 
            Fx.Assert(instance is IList, "Instance needs to be IList for remove to work");
            Fx.Assert(instance != null, "instance should not be null"); 
            IList instanceList = (IList)instance; 
            int index = instanceList.IndexOf(item.GetCurrentValue());
            instanceList.Remove(item.GetCurrentValue()); 
            this.modelItems.Remove(item);

            if (this.PropertyChanged != null)
            { 
                this.PropertyChanged(this, new PropertyChangedEventArgs("Count"));
            } 
 
            if (this.CollectionChanged != null)
            { 
                this.CollectionChanged(this, new System.Collections.Specialized.NotifyCollectionChangedEventArgs(System.Collections.Specialized.NotifyCollectionChangedAction.Remove, item, index));
            }
        }
 
        internal void RemoveAtCore(int index)
        { 
            Fx.Assert(instance is IList, "Instance needs to be IList for remove to work"); 
            Fx.Assert(instance != null, "instance should not be null");
            IList instanceList = (IList)instance; 
            ModelItem item = this.modelItems[index];
            instanceList.RemoveAt(index);
            this.modelItems.RemoveAt(index);
 
            if (this.PropertyChanged != null)
            { 
                this.PropertyChanged(this, new PropertyChangedEventArgs("Count")); 
            }
 
            if (this.CollectionChanged != null)
            {
                this.CollectionChanged(this, new System.Collections.Specialized.NotifyCollectionChangedEventArgs(System.Collections.Specialized.NotifyCollectionChangedAction.Remove, item, index));
            } 
        }
 
        void UpdateInstance(object instance) 
        {
            this.instance = instance; 
            IEnumerable instanceCollection = this.instance as IEnumerable;
            if (instanceCollection != null)
            {
                foreach (object item in instanceCollection) 
                {
                    ModelItem modelItem = this.modelTreeManager.WrapAsModelItem(this, item); 
                    this.modelItems.Add(modelItem); 
                }
            } 
        }

        void IModelTreeItem.RemoveParent(ModelItem oldParent)
        { 
            if (this.parents.Contains(oldParent))
            { 
                this.parents.Remove(oldParent); 
            }
        } 

        void IModelTreeItem.RemoveSource(ModelProperty oldModelProperty)
        {
            if (this.sources.Contains(oldModelProperty)) 
            {
                this.sources.Remove(oldModelProperty); 
            } 
            else
            { 
                // also check if the same parent.property is in the list as a different instance of oldModelProperty
                ModelProperty foundProperty = this.sources.Find((modelProperty) => modelProperty.Name.Equals(oldModelProperty.Name) && modelProperty.Parent == oldModelProperty.Parent);
                if (foundProperty != null)
                { 
                    this.sources.Remove(foundProperty);
                } 
                else 
                {
                    Fx.Assert("Trying to call RemoveSource() on modelItem that is not parented by oldModelProperty"); 
                }
            }
        }
    } 
}

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

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
ModelItemCollectionImpl.cs source code in C# .NET

Source code for the .NET framework in C#

Code:

Link Menu
