ListViewGroupItemCollection.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ListViewGroupItemCollection.cs / 1 / ListViewGroupItemCollection.cs
                        
                        
                            using System.ComponentModel; 
using System.Diagnostics;
using System;
using System.Security.Permissions;
using System.Drawing; 
using System.Windows.Forms;
using System.ComponentModel.Design; 
using System.Collections; 
using Microsoft.Win32;
using System.Globalization; 

namespace System.Windows.Forms
{
    // A collection of items in a ListViewGroup. 
    //
    internal class ListViewGroupItemCollection : ListView.ListViewItemCollection.IInnerList { 
        private ListViewGroup group; 
        private ArrayList items;
 
        public ListViewGroupItemCollection(ListViewGroup group) {
            this.group = group;
        }
 
        public int Count
        { 
            get 
            {
                return Items.Count; 
            }
        }

        private ArrayList Items 
        {
            get 
            { 
                if (items == null) {
                    items = new ArrayList(); 
                }
                return items;
            }
        } 

        public bool OwnerIsVirtualListView { 
            get { 
                if (this.group.ListView != null) {
                    return group.ListView.VirtualMode; 
                } else {
                    return false;
                }
            } 
        }
 
        public bool OwnerIsDesignMode { 
            get {
                if (this.group.ListView != null) { 
                    ISite s = group.ListView.Site;
                    return(s == null) ? false : s.DesignMode;
                } else {
                    return false; 
                }
            } 
        } 

        public ListViewItem this[int index] { 
            get {
                return (ListViewItem)Items[index];
            }
            set { 
                if (value != Items[index]) {
                    MoveToGroup((ListViewItem)Items[index], null); 
                    Items[index] = value; 
                    MoveToGroup((ListViewItem)Items[index], this.group);
                } 
            }
        }

        public ListViewItem Add(ListViewItem value) { 
            CheckListViewItem(value);
 
            MoveToGroup(value, this.group); 
            Items.Add(value);
            return value; 
        }

        public void AddRange(ListViewItem[] items) {
            for (int i = 0; i < items.Length; i ++) { 
                CheckListViewItem(items[i]);
            } 
 
            Items.AddRange(items);
 
            for(int i=0; i < items.Length; i++) {
                MoveToGroup(items[i], this.group);
            }
        } 

        ///  
        ///     throws an ArgumentException if the listViewItem is in another listView already. 
        /// 
        private void CheckListViewItem(ListViewItem item) { 
            if (item.ListView != null && item.ListView != this.group.ListView) {
                // [....]: maybe we should throw an InvalidOperationException when we add an item from another listView
                // into this group's collection.
                // But in a similar situation, ListViewCollection throws an ArgumentException. This is the v1.* behavior 
                throw new ArgumentException(SR.GetString(SR.OnlyOneControl, item.Text), "item");
            } 
        } 

        public void Clear() { 
            for(int i=0; i < this.Count; i++) {
                MoveToGroup(this[i], null);
            }
            Items.Clear(); 
        }
 
        public bool Contains(ListViewItem item) { 
            return Items.Contains(item);
        } 

        public void CopyTo(Array dest, int index) {
            Items.CopyTo(dest, index);
        } 

        public IEnumerator GetEnumerator() { 
            return Items.GetEnumerator(); 
        }
 
        public int IndexOf(ListViewItem item)
        {
            return Items.IndexOf(item);
        } 

        public ListViewItem Insert(int index, ListViewItem item) { 
            CheckListViewItem(item); 

            MoveToGroup(item, this.group); 
            Items.Insert(index, item);
            return item;
        }
 
        private void MoveToGroup(ListViewItem item, ListViewGroup newGroup) {
 
            ListViewGroup oldGroup = item.Group; 
            if (oldGroup != newGroup) {
                item.group = newGroup; 
                if (oldGroup != null) {
                    oldGroup.Items.Remove(item);
                }
                UpdateNativeListViewItem(item); 
            }
        } 
 
        public void Remove(ListViewItem item)
        { 
            Items.Remove(item);

            if (item.group == this.group) {
                item.group = null; 
                UpdateNativeListViewItem(item);
            } 
        } 

        public void RemoveAt(int index) { 
            Remove(this[index]);
        }

        private void UpdateNativeListViewItem(ListViewItem item) { 
            if (item.ListView != null && item.ListView.IsHandleCreated && !item.ListView.InsertingItemsNatively) {
                item.UpdateStateToListView(item.Index); 
            } 
        }
    } 
}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ListViewGroupItemCollection.cs source code in C# .NET

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