UnsettableComboBox.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 / fx / src / MIT / System / Web / UI / MobileControls / Design / Util / UnsettableComboBox.cs / 1305376 / UnsettableComboBox.cs
                        

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

namespace System.Web.UI.Design.MobileControls.Util 
{ 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Drawing;
    using System.Windows.Forms; 

    //   Standard combobox with a "Not Set" item as the first item in its dropdown. 
    //   It also automatically blanks out the "Not Set" item on losing focus. 
    [
        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 UnsettableComboBox : ComboBox 
    {
        private String notSetText; 
        private String notSetCompactText; 

        internal UnsettableComboBox() 
        {
            notSetText = SR.GetString(SR.UnsettableComboBox_NotSetText);
            notSetCompactText = SR.GetString(SR.UnsettableComboBox_NotSetCompactText);
        } 

        internal String NotSetText 
        { 
            get
            { 
                return notSetText;
            }
            set
            { 
                notSetText = value;
            } 
        } 

        internal String NotSetCompactText 
        {
            get
            {
                return notSetCompactText; 
            }
            set 
            { 
                notSetCompactText = value;
            } 
        }

        public override String Text
        { 
            get
            { 
                // handle DropDown styles in Templating Options dialog 
                // if (this.SelectedIndex == 0) || (this.SelectedIndex == -1))
                if (this.SelectedIndex == 0) 
                {
                    return String.Empty;
                }
                else 
                {
                    return base.Text; 
                } 
            }
 
            set
            {
                if (value == notSetCompactText)
                { 
                    base.Text = String.Empty;
                } 
                else 
                {
                    base.Text = value; 
                }
            }
        }
 
        internal void AddItem(Object item)
        { 
            EnsureNotSetItem(); 
            Items.Add(item);
        } 

        internal void EnsureNotSetItem()
        {
            if (Items.Count == 0) 
            {
                Items.Add(notSetText); 
            } 
        }
 
#if UNUSED_CODE
        internal bool IsSet()
        {
            return SelectedIndex > 0; 
        }
#endif 
        protected override void OnLostFocus(EventArgs e) 
        {
            base.OnLostFocus(e); 

            if (SelectedIndex == 0)
            {
                SelectedIndex = -1; 
            }
        } 
 
        protected override void SetItemsCore(IList values)
        { 
            Items.Clear();

            if (!DesignMode)
            { 
                Items.Add(notSetText);
            } 
 
            // Unfortunately. the interfaces between SetItemsCore and
            // AddItemsCore are mismatched as of 3106. 
            ArrayList items = new ArrayList();
            foreach(Object item in values)
            {
                items.Add(item); 
            }
 
            base.AddItemsCore(items.ToArray()); 
        }
    } 
}

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

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