CurrentChangingEventArgs.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 / wpf / src / Base / System / ComponentModel / CurrentChangingEventArgs.cs / 1305600 / CurrentChangingEventArgs.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: CurrentChanging event arguments 
// 
//---------------------------------------------------------------------------
 
using System;
using System.Windows;
using MS.Internal.WindowsBase;
 
namespace System.ComponentModel
{ 
 
    /// 
    /// Arguments for the CurrentChanging event. 
    /// A collection that supports ICollectionView raises this event
    /// whenever the CurrentItem is changing, or when the contents
    /// of the collection has been reset.
    /// By default, the event is cancelable when CurrentChange is 
    /// caused by a move current operation and uncancelable when
    /// caused by an irreversable collection change operation. 
    ///  
    public class CurrentChangingEventArgs : EventArgs
    { 
        //-----------------------------------------------------
        //
        //  Constructors
        // 
        //-----------------------------------------------------
 
        ///  
        /// Construct a cancelable CurrentChangingEventArgs that is used
        /// to notify listeners when CurrentItem is about to change. 
        /// 
        public CurrentChangingEventArgs()
        {
            Initialize(true); 
        }
 
        ///  
        /// Construct a CurrentChangingEventArgs that is used to notify listeners when CurrentItem is about to change.
        ///  
        /// if false, setting Cancel to true will cause an InvalidOperationException to be thrown.
        public CurrentChangingEventArgs(bool isCancelable)
        {
            Initialize(isCancelable); 
        }
 
        private void Initialize(bool isCancelable) 
        {
            _isCancelable = isCancelable; 
        }

        //------------------------------------------------------
        // 
        //  Public Properties
        // 
        //----------------------------------------------------- 

        ///  
        /// If this event can be canceled.  When this is False, setting Cancel to True will cause an InvalidOperationException to be thrown.
        /// 
        public bool IsCancelable
        { 
            get { return _isCancelable; }
        } 
 
        /// 
        /// When set to true, this event will be canceled. 
        /// 
        /// 
        /// If IsCancelable is False, setting this value to True will cause an InvalidOperationException to be thrown.
        ///  
        public bool Cancel
        { 
            get { return _cancel; } 
            set
            { 
                if (IsCancelable)
                {
                    _cancel = value;
                } 
                else if (value)
                { 
                    throw new InvalidOperationException(SR.Get(SRID.CurrentChangingCannotBeCanceled)); 
                }
            } 
        }

        //------------------------------------------------------
        // 
        //  Private Fields
        // 
        //------------------------------------------------------ 

        private bool _cancel = false; 
        private bool _isCancelable;
    }

    ///  
    ///     The delegate to use for handlers that receive the CurrentChanging event.
    ///  
    public delegate void CurrentChangingEventHandler(object sender, CurrentChangingEventArgs e); 

} 



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

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