EditableTreeList.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / MIT / System / Web / UI / MobileControls / Design / Util / EditableTreeList.cs / 1305376 / EditableTreeList.cs

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

namespace System.Web.UI.Design.MobileControls.Util 
{ 
    using System;
    using System.Diagnostics; 
    using System.Drawing;
    using System.ComponentModel;
    using System.Globalization;
    using System.Windows.Forms; 
    using System.Web.UI.Design.MobileControls;
 
    [ 
        ToolboxItem(false),
        System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, 
            Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)
    ]
    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
    internal class EditableTreeList : Panel 
    {
 
        private const String _assertMsgNullNodeSelected = 
            "Caller is responsible for ensuring a TreeNode is selected. "
            + "Modified TreeViewNode without calling UpdateButtonsEnabling()?"; 

        private const String _assertMsgOutOfBounds =
            "Caller is responsible for ensuring this action does not move the "
            + "selected TreeViewNode out of bounds. " 
            + "Modified TvList without calling UpdateButtonsEnabling()?";
 
        internal TreeNode LastNodeChanged = null; 
        internal TreeNode EditCandidateNode = null;
        internal EventHandler RemoveHandler; 
        private bool _caseSensitive;

        internal System.Windows.Forms.Button BtnAdd;
        internal System.Windows.Forms.Button BtnRemove; 
        internal System.Windows.Forms.Button BtnDown;
        internal System.Windows.Forms.Button BtnUp; 
        internal System.Windows.Forms.TreeView TvList; 
        internal System.Windows.Forms.Label LblTitle;
        internal System.Windows.Forms.ContextMenu CntxtMenu; 
        internal System.Windows.Forms.MenuItem CntxtMenuItem;

        internal EditableTreeList() : this(true, true, 16)
        { 
        }
 
        internal EditableTreeList(bool showAddButton, bool caseSensitive, int Y) 
        {
            this.TvList = new System.Windows.Forms.TreeView(); 
            this.BtnAdd = new System.Windows.Forms.Button();
            this.BtnDown = new System.Windows.Forms.Button();
            this.LblTitle = new System.Windows.Forms.Label();
            this.BtnUp = new System.Windows.Forms.Button(); 
            this.BtnRemove = new System.Windows.Forms.Button();
            this.CntxtMenuItem = new System.Windows.Forms.MenuItem(); 
            this.CntxtMenu = new System.Windows.Forms.ContextMenu(); 

            LblTitle.Size = new System.Drawing.Size(210, 16); 
            LblTitle.Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right;;

            TvList.Location = new System.Drawing.Point(0, 16);
            TvList.Size = new System.Drawing.Size(178, 148); 
            TvList.ForeColor = System.Drawing.SystemColors.WindowText;
            TvList.Anchor = AnchorStyles.Top 
                | AnchorStyles.Bottom 
                | AnchorStyles.Left
                | AnchorStyles.Right; 
            TvList.LabelEdit = true;
            TvList.ShowPlusMinus = false;
            TvList.HideSelection = false;
            TvList.Indent = 15; 
            TvList.ShowRootLines = false;
            TvList.ShowLines = false; 
            TvList.ContextMenu = CntxtMenu; 

            BtnUp.AccessibleName = SR.GetString(SR.EditableTreeList_MoveUpName); 
            BtnUp.AccessibleDescription = SR.GetString(SR.EditableTreeList_MoveUpDescription);
            BtnUp.Name = SR.GetString(SR.EditableTreeList_MoveUpName);
            BtnUp.Location = new System.Drawing.Point(182, 16);
            BtnUp.Size = new System.Drawing.Size(28, 27); 
            BtnUp.Anchor = AnchorStyles.Top | AnchorStyles.Right;;
 
            BtnDown.AccessibleName = SR.GetString(SR.EditableTreeList_MoveDownName); 
            BtnDown.AccessibleDescription = SR.GetString(SR.EditableTreeList_MoveDownDescription);
            BtnDown.Name = SR.GetString(SR.EditableTreeList_MoveDownName); 
            BtnDown.Location = new System.Drawing.Point(182, 48);
            BtnDown.Size = new System.Drawing.Size(28, 27);
            BtnDown.Anchor = AnchorStyles.Top | AnchorStyles.Right;
 
            BtnRemove.AccessibleName = SR.GetString(SR.EditableTreeList_DeleteName);
            BtnRemove.AccessibleDescription = SR.GetString(SR.EditableTreeList_DeleteDescription); 
            BtnRemove.Name = SR.GetString(SR.EditableTreeList_DeleteName); 
            BtnRemove.Location = new System.Drawing.Point(182, 136);
            BtnRemove.Size = new System.Drawing.Size(28, 27); 
            BtnRemove.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;

            BtnAdd.AccessibleName = SR.GetString(SR.EditableTreeList_AddName);
            BtnAdd.AccessibleDescription = SR.GetString(SR.EditableTreeList_AddDescription); 
            BtnAdd.Name = SR.GetString(SR.EditableTreeList_AddName);
            BtnAdd.Location = new System.Drawing.Point(0, 168); 
            BtnAdd.Size = new System.Drawing.Size(178, 25); 
            BtnAdd.Anchor = AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right;
 
            CntxtMenuItem.Text = SR.GetString(SR.EditableTreeList_Rename);
            CntxtMenu.MenuItems.Add(CntxtMenuItem);

            this.Location = new System.Drawing.Point(8, Y); 
            this.Size = new System.Drawing.Size(210, 196);
 
            this.Controls.Add(LblTitle); 
            this.Controls.Add(TvList);
            this.Controls.Add(BtnUp); 
            this.Controls.Add(BtnDown);
            this.Controls.Add(BtnRemove);
            this.Controls.Add(BtnAdd);
 
            BtnDown.Image = GenericUI.SortDownIcon;
            BtnUp.Image = GenericUI.SortUpIcon; 
            BtnRemove.Image = GenericUI.DeleteIcon; 

            BtnUp.Click += new EventHandler(MoveSelectedItemUp); 
            BtnDown.Click += new EventHandler(MoveSelectedItemDown);
            RemoveHandler = new EventHandler(OnRemove);
            BtnRemove.Click += RemoveHandler;
            TvList.AfterSelect += new TreeViewEventHandler(OnListSelect); 
            TvList.KeyDown += new KeyEventHandler(OnKeyDown);
            TvList.MouseUp += new MouseEventHandler(OnListMouseUp); 
            TvList.MouseDown += new MouseEventHandler(OnListMouseDown); 
            CntxtMenu.Popup += new EventHandler(OnPopup);
            CntxtMenuItem.Click += new EventHandler(OnContextMenuItemClick); 

            UpdateButtonsEnabling();

            if(!showAddButton) 
            {
                // stretch UI to occupy space where add button was. 
                BtnAdd.Visible = false; 
                int offset = 4 + BtnAdd.Height;
                TvList.Height += offset; 
                BtnRemove.Top += offset;
            }
            _caseSensitive = caseSensitive;
        } 

        //////////////////////////////////////////////////////////////////////// 
        //  End Windes Generated 
        ////////////////////////////////////////////////////////////////////////
 
        internal int SelectedIndex
        {
            get
            { 
                TreeNode selectedNode = TvList.SelectedNode;
                if(selectedNode != null) 
                { 
                    return selectedNode.Index;
                } 
                else
                {
                    return -1;
                } 
            }
        } 
 
        internal TreeNode SelectedNode
        { 
            get
            {
                return TvList.SelectedNode;
            } 
        }
 
        private TreeNode SelectedNodeChecked 
        {
            get 
            {
                TreeNode node = TvList.SelectedNode;
                Debug.Assert(
                    node != null, 
                    _assertMsgNullNodeSelected
                ); 
                return node; 
            }
        } 

        private void MoveSelectedNode(int direction)
        {
            Debug.Assert(direction == 1 || direction == -1); 
            LastNodeChanged = TvList.SelectedNode;
            Debug.Assert( 
                LastNodeChanged != null, 
                _assertMsgNullNodeSelected
            ); 
            int index = LastNodeChanged.Index;
            Debug.Assert(
                (index + direction >= 0)
                && ((index + direction) < TvList.Nodes.Count), 
                _assertMsgOutOfBounds
            ); 
            TvList.Nodes.RemoveAt(index); 
            TvList.Nodes.Insert(index + direction, LastNodeChanged);
            TvList.SelectedNode = LastNodeChanged; 
        }

        internal void MoveSelectedItemUp(Object sender, EventArgs e)
        { 
            MoveSelectedNode(-1);
            UpdateButtonsEnabling(); 
        } 

        internal void MoveSelectedItemDown(Object sender, EventArgs e) 
        {
            MoveSelectedNode(1);
            UpdateButtonsEnabling();
        } 

        internal void RemoveSelectedItem() 
        { 
            LastNodeChanged = SelectedNodeChecked;
            TvList.Nodes.Remove(LastNodeChanged); 
            UpdateButtonsEnabling();
        }

        private void OnKeyDown(Object sender, KeyEventArgs e) 
        {
            switch(e.KeyData) 
            { 
                case Keys.F2:
                { 
                    TreeNode selectedNode = TvList.SelectedNode;
                    if(selectedNode != null)
                    {
                        selectedNode.BeginEdit(); 
                    }
                    break; 
                } 
                case (Keys.Control | Keys.Home):
                { 
                    if(TvList.Nodes.Count > 0)
                    {
                        TvList.SelectedNode = TvList.Nodes[0];
                    } 
                    break;
                } 
                case (Keys.Control | Keys.End): 
                {
                    int numNodes = TvList.Nodes.Count; 
                    if(numNodes > 0)
                    {
                        TvList.SelectedNode = TvList.Nodes[numNodes - 1];
                    } 
                    break;
                } 
            } 
        }
 
        private void OnRemove(Object sender, EventArgs e)
        {
            RemoveSelectedItem();
        } 

        private void OnListSelect(Object sender, TreeViewEventArgs e) 
        { 
            UpdateButtonsEnabling();
        } 

        private void OnListMouseUp(Object sender, MouseEventArgs e)
        {
            EditCandidateNode= null; 
            if (e.Button == MouseButtons.Right)
            { 
                EditCandidateNode = (TreeNode)TvList.GetNodeAt (e.X, e.Y); 
            }
        } 

        private void OnListMouseDown(Object sender, MouseEventArgs e)
        {
            EditCandidateNode = null; 
            if (e.Button == MouseButtons.Right)
            { 
                EditCandidateNode = (TreeNode)TvList.GetNodeAt (e.X, e.Y); 
            }
        } 

        private void OnPopup(Object sender, EventArgs e)
        {
            CntxtMenuItem.Enabled = (EditCandidateNode != null || 
                                                    TvList.SelectedNode != null);
        } 
 
        private void OnContextMenuItemClick(Object sender, EventArgs e)
        { 
            if(EditCandidateNode == null)
            {
               // context menu key pressed
               if (TvList.SelectedNode!=null) 
               {
                    TvList.SelectedNode.BeginEdit(); 
               } 
            }
            else 
            {
                // right mouse-click
                EditCandidateNode.BeginEdit();
            } 
            EditCandidateNode = null;
        } 
 
        internal String GetUniqueLabel(String label)
        { 
            int index = 1;
            String uniqueLabel = label + index;
            while(LabelExists(uniqueLabel))
            { 
                uniqueLabel = label + (++index);
            } 
            return uniqueLabel; 
        }
 
        internal bool LabelExists(String label)
        {
            foreach(TreeNode node in TvList.Nodes)
            { 
                if(String.Compare(node.Text, label, ((!_caseSensitive) ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal)) == 0)
                { 
                    return true; 
                }
            } 
            return false;
        }

        internal void UpdateButtonsEnabling() 
        {
            int selectedIndex = SelectedIndex; 
            bool anItemIsSelected = (selectedIndex >= 0); 

            BtnRemove.Enabled = anItemIsSelected; 
            if (anItemIsSelected)
            {
                BtnUp.Enabled = (selectedIndex > 0);
                BtnDown.Enabled = (selectedIndex < TvList.Nodes.Count - 1); 
            }
            else 
            { 
                BtnUp.Enabled = false;
                BtnDown.Enabled = false; 
            }
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.Design.MobileControls.Util 
{ 
    using System;
    using System.Diagnostics; 
    using System.Drawing;
    using System.ComponentModel;
    using System.Globalization;
    using System.Windows.Forms; 
    using System.Web.UI.Design.MobileControls;
 
    [ 
        ToolboxItem(false),
        System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, 
            Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)
    ]
    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")]
    internal class EditableTreeList : Panel 
    {
 
        private const String _assertMsgNullNodeSelected = 
            "Caller is responsible for ensuring a TreeNode is selected. "
            + "Modified TreeViewNode without calling UpdateButtonsEnabling()?"; 

        private const String _assertMsgOutOfBounds =
            "Caller is responsible for ensuring this action does not move the "
            + "selected TreeViewNode out of bounds. " 
            + "Modified TvList without calling UpdateButtonsEnabling()?";
 
        internal TreeNode LastNodeChanged = null; 
        internal TreeNode EditCandidateNode = null;
        internal EventHandler RemoveHandler; 
        private bool _caseSensitive;

        internal System.Windows.Forms.Button BtnAdd;
        internal System.Windows.Forms.Button BtnRemove; 
        internal System.Windows.Forms.Button BtnDown;
        internal System.Windows.Forms.Button BtnUp; 
        internal System.Windows.Forms.TreeView TvList; 
        internal System.Windows.Forms.Label LblTitle;
        internal System.Windows.Forms.ContextMenu CntxtMenu; 
        internal System.Windows.Forms.MenuItem CntxtMenuItem;

        internal EditableTreeList() : this(true, true, 16)
        { 
        }
 
        internal EditableTreeList(bool showAddButton, bool caseSensitive, int Y) 
        {
            this.TvList = new System.Windows.Forms.TreeView(); 
            this.BtnAdd = new System.Windows.Forms.Button();
            this.BtnDown = new System.Windows.Forms.Button();
            this.LblTitle = new System.Windows.Forms.Label();
            this.BtnUp = new System.Windows.Forms.Button(); 
            this.BtnRemove = new System.Windows.Forms.Button();
            this.CntxtMenuItem = new System.Windows.Forms.MenuItem(); 
            this.CntxtMenu = new System.Windows.Forms.ContextMenu(); 

            LblTitle.Size = new System.Drawing.Size(210, 16); 
            LblTitle.Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right;;

            TvList.Location = new System.Drawing.Point(0, 16);
            TvList.Size = new System.Drawing.Size(178, 148); 
            TvList.ForeColor = System.Drawing.SystemColors.WindowText;
            TvList.Anchor = AnchorStyles.Top 
                | AnchorStyles.Bottom 
                | AnchorStyles.Left
                | AnchorStyles.Right; 
            TvList.LabelEdit = true;
            TvList.ShowPlusMinus = false;
            TvList.HideSelection = false;
            TvList.Indent = 15; 
            TvList.ShowRootLines = false;
            TvList.ShowLines = false; 
            TvList.ContextMenu = CntxtMenu; 

            BtnUp.AccessibleName = SR.GetString(SR.EditableTreeList_MoveUpName); 
            BtnUp.AccessibleDescription = SR.GetString(SR.EditableTreeList_MoveUpDescription);
            BtnUp.Name = SR.GetString(SR.EditableTreeList_MoveUpName);
            BtnUp.Location = new System.Drawing.Point(182, 16);
            BtnUp.Size = new System.Drawing.Size(28, 27); 
            BtnUp.Anchor = AnchorStyles.Top | AnchorStyles.Right;;
 
            BtnDown.AccessibleName = SR.GetString(SR.EditableTreeList_MoveDownName); 
            BtnDown.AccessibleDescription = SR.GetString(SR.EditableTreeList_MoveDownDescription);
            BtnDown.Name = SR.GetString(SR.EditableTreeList_MoveDownName); 
            BtnDown.Location = new System.Drawing.Point(182, 48);
            BtnDown.Size = new System.Drawing.Size(28, 27);
            BtnDown.Anchor = AnchorStyles.Top | AnchorStyles.Right;
 
            BtnRemove.AccessibleName = SR.GetString(SR.EditableTreeList_DeleteName);
            BtnRemove.AccessibleDescription = SR.GetString(SR.EditableTreeList_DeleteDescription); 
            BtnRemove.Name = SR.GetString(SR.EditableTreeList_DeleteName); 
            BtnRemove.Location = new System.Drawing.Point(182, 136);
            BtnRemove.Size = new System.Drawing.Size(28, 27); 
            BtnRemove.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;

            BtnAdd.AccessibleName = SR.GetString(SR.EditableTreeList_AddName);
            BtnAdd.AccessibleDescription = SR.GetString(SR.EditableTreeList_AddDescription); 
            BtnAdd.Name = SR.GetString(SR.EditableTreeList_AddName);
            BtnAdd.Location = new System.Drawing.Point(0, 168); 
            BtnAdd.Size = new System.Drawing.Size(178, 25); 
            BtnAdd.Anchor = AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right;
 
            CntxtMenuItem.Text = SR.GetString(SR.EditableTreeList_Rename);
            CntxtMenu.MenuItems.Add(CntxtMenuItem);

            this.Location = new System.Drawing.Point(8, Y); 
            this.Size = new System.Drawing.Size(210, 196);
 
            this.Controls.Add(LblTitle); 
            this.Controls.Add(TvList);
            this.Controls.Add(BtnUp); 
            this.Controls.Add(BtnDown);
            this.Controls.Add(BtnRemove);
            this.Controls.Add(BtnAdd);
 
            BtnDown.Image = GenericUI.SortDownIcon;
            BtnUp.Image = GenericUI.SortUpIcon; 
            BtnRemove.Image = GenericUI.DeleteIcon; 

            BtnUp.Click += new EventHandler(MoveSelectedItemUp); 
            BtnDown.Click += new EventHandler(MoveSelectedItemDown);
            RemoveHandler = new EventHandler(OnRemove);
            BtnRemove.Click += RemoveHandler;
            TvList.AfterSelect += new TreeViewEventHandler(OnListSelect); 
            TvList.KeyDown += new KeyEventHandler(OnKeyDown);
            TvList.MouseUp += new MouseEventHandler(OnListMouseUp); 
            TvList.MouseDown += new MouseEventHandler(OnListMouseDown); 
            CntxtMenu.Popup += new EventHandler(OnPopup);
            CntxtMenuItem.Click += new EventHandler(OnContextMenuItemClick); 

            UpdateButtonsEnabling();

            if(!showAddButton) 
            {
                // stretch UI to occupy space where add button was. 
                BtnAdd.Visible = false; 
                int offset = 4 + BtnAdd.Height;
                TvList.Height += offset; 
                BtnRemove.Top += offset;
            }
            _caseSensitive = caseSensitive;
        } 

        //////////////////////////////////////////////////////////////////////// 
        //  End Windes Generated 
        ////////////////////////////////////////////////////////////////////////
 
        internal int SelectedIndex
        {
            get
            { 
                TreeNode selectedNode = TvList.SelectedNode;
                if(selectedNode != null) 
                { 
                    return selectedNode.Index;
                } 
                else
                {
                    return -1;
                } 
            }
        } 
 
        internal TreeNode SelectedNode
        { 
            get
            {
                return TvList.SelectedNode;
            } 
        }
 
        private TreeNode SelectedNodeChecked 
        {
            get 
            {
                TreeNode node = TvList.SelectedNode;
                Debug.Assert(
                    node != null, 
                    _assertMsgNullNodeSelected
                ); 
                return node; 
            }
        } 

        private void MoveSelectedNode(int direction)
        {
            Debug.Assert(direction == 1 || direction == -1); 
            LastNodeChanged = TvList.SelectedNode;
            Debug.Assert( 
                LastNodeChanged != null, 
                _assertMsgNullNodeSelected
            ); 
            int index = LastNodeChanged.Index;
            Debug.Assert(
                (index + direction >= 0)
                && ((index + direction) < TvList.Nodes.Count), 
                _assertMsgOutOfBounds
            ); 
            TvList.Nodes.RemoveAt(index); 
            TvList.Nodes.Insert(index + direction, LastNodeChanged);
            TvList.SelectedNode = LastNodeChanged; 
        }

        internal void MoveSelectedItemUp(Object sender, EventArgs e)
        { 
            MoveSelectedNode(-1);
            UpdateButtonsEnabling(); 
        } 

        internal void MoveSelectedItemDown(Object sender, EventArgs e) 
        {
            MoveSelectedNode(1);
            UpdateButtonsEnabling();
        } 

        internal void RemoveSelectedItem() 
        { 
            LastNodeChanged = SelectedNodeChecked;
            TvList.Nodes.Remove(LastNodeChanged); 
            UpdateButtonsEnabling();
        }

        private void OnKeyDown(Object sender, KeyEventArgs e) 
        {
            switch(e.KeyData) 
            { 
                case Keys.F2:
                { 
                    TreeNode selectedNode = TvList.SelectedNode;
                    if(selectedNode != null)
                    {
                        selectedNode.BeginEdit(); 
                    }
                    break; 
                } 
                case (Keys.Control | Keys.Home):
                { 
                    if(TvList.Nodes.Count > 0)
                    {
                        TvList.SelectedNode = TvList.Nodes[0];
                    } 
                    break;
                } 
                case (Keys.Control | Keys.End): 
                {
                    int numNodes = TvList.Nodes.Count; 
                    if(numNodes > 0)
                    {
                        TvList.SelectedNode = TvList.Nodes[numNodes - 1];
                    } 
                    break;
                } 
            } 
        }
 
        private void OnRemove(Object sender, EventArgs e)
        {
            RemoveSelectedItem();
        } 

        private void OnListSelect(Object sender, TreeViewEventArgs e) 
        { 
            UpdateButtonsEnabling();
        } 

        private void OnListMouseUp(Object sender, MouseEventArgs e)
        {
            EditCandidateNode= null; 
            if (e.Button == MouseButtons.Right)
            { 
                EditCandidateNode = (TreeNode)TvList.GetNodeAt (e.X, e.Y); 
            }
        } 

        private void OnListMouseDown(Object sender, MouseEventArgs e)
        {
            EditCandidateNode = null; 
            if (e.Button == MouseButtons.Right)
            { 
                EditCandidateNode = (TreeNode)TvList.GetNodeAt (e.X, e.Y); 
            }
        } 

        private void OnPopup(Object sender, EventArgs e)
        {
            CntxtMenuItem.Enabled = (EditCandidateNode != null || 
                                                    TvList.SelectedNode != null);
        } 
 
        private void OnContextMenuItemClick(Object sender, EventArgs e)
        { 
            if(EditCandidateNode == null)
            {
               // context menu key pressed
               if (TvList.SelectedNode!=null) 
               {
                    TvList.SelectedNode.BeginEdit(); 
               } 
            }
            else 
            {
                // right mouse-click
                EditCandidateNode.BeginEdit();
            } 
            EditCandidateNode = null;
        } 
 
        internal String GetUniqueLabel(String label)
        { 
            int index = 1;
            String uniqueLabel = label + index;
            while(LabelExists(uniqueLabel))
            { 
                uniqueLabel = label + (++index);
            } 
            return uniqueLabel; 
        }
 
        internal bool LabelExists(String label)
        {
            foreach(TreeNode node in TvList.Nodes)
            { 
                if(String.Compare(node.Text, label, ((!_caseSensitive) ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal)) == 0)
                { 
                    return true; 
                }
            } 
            return false;
        }

        internal void UpdateButtonsEnabling() 
        {
            int selectedIndex = SelectedIndex; 
            bool anItemIsSelected = (selectedIndex >= 0); 

            BtnRemove.Enabled = anItemIsSelected; 
            if (anItemIsSelected)
            {
                BtnUp.Enabled = (selectedIndex > 0);
                BtnDown.Enabled = (selectedIndex < TvList.Nodes.Count - 1); 
            }
            else 
            { 
                BtnUp.Enabled = false;
                BtnDown.Enabled = false; 
            }
        }
    }
} 

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

                        

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