TextChangedEventArgs.cs source code in C# .NET

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Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Controls / TextChangedEventArgs.cs / 2 / TextChangedEventArgs.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// 
// Description: TextChanged event argument. 
//
// History: 
//  09/27/2004 : [....] - Created
//
//---------------------------------------------------------------------------
 
using System.ComponentModel;
using System.Windows.Documents; 
using System.Collections.Generic; 
using System.Collections.ObjectModel;
 
namespace System.Windows.Controls
{
    #region TextChangedEvent
 
    /// 
    /// How the undo stack caused or is affected by a text change. 
    ///  
    public enum UndoAction
    { 
        /// 
        /// This change will not affect the undo stack at all
        /// 
        None = 0, 

        ///  
        /// This change will merge into the previous undo unit 
        /// 
        Merge = 1, 

        /// 
        /// This change is the result of a call to Undo()
        ///  
        Undo = 2,
 
        ///  
        /// This change is the result of a call to Redo()
        ///  
        Redo = 3,

        /// 
        /// This change will clear the undo stack 
        /// 
        Clear = 4, 
 
        /// 
        /// This change will create a new undo unit 
        /// 
        Create = 5
    }
 
    /// 
    /// The delegate to use for handlers that receive TextChangedEventArgs 
    ///  
    public delegate void TextChangedEventHandler(object sender, TextChangedEventArgs e);
 
    /// 
    /// The TextChangedEventArgs class represents a type of RoutedEventArgs that
    /// are relevant to events raised by changing editable text.
    ///  
    public class TextChangedEventArgs : RoutedEventArgs
    { 
        ///  
        /// constructor
        ///  
        /// event id
        /// UndoAction
        /// ReadOnlyCollection
        public TextChangedEventArgs(RoutedEvent id, UndoAction action, ICollection changes) : base() 
        {
            if (id == null) 
            { 
                throw new ArgumentNullException("id");
            } 

            if (action < UndoAction.None || action > UndoAction.Create)
            {
                throw new InvalidEnumArgumentException("action", (int)action, typeof(UndoAction)); 
            }
 
            RoutedEvent=id; 
            _undoAction = action;
            _changes = changes; 
        }

        /// 
        /// constructor 
        /// 
        /// event id 
        /// UndoAction 
        public TextChangedEventArgs(RoutedEvent id, UndoAction action)
            : this(id, action, new ReadOnlyCollection(new List())) 
        {
        }

        ///  
        /// How the undo stack caused or is affected by this text change
        ///  
        /// UndoAction enum 
        public UndoAction UndoAction
        { 
            get
            {
                return _undoAction;
            } 
        }
 
        ///  
        /// A readonly list of TextChanges, sorted by offset in order from the beginning to the end of
        /// the document, describing the dirty areas of the document and in what way(s) those 
        /// areas differ from the pre-change document.  For example, if content at offset 0 was:
        ///
        /// The quick brown fox jumps over the lazy dog.
        /// 
        /// and changed to:
        /// 
        /// The brown fox jumps over a dog. 
        ///
        /// Changes would contain two TextChanges with the following information: 
        ///
        /// Change 1
        /// --------
        /// Offset: 5 
        /// RemovedCount: 6
        /// AddedCount: 0 
        /// PropertyCount: 0 
        ///
        /// Change 2 
        /// --------
        /// Offset: 26
        /// RemovedCount: 8
        /// AddedCount: 1 
        /// PropertyCount: 0
        /// 
        /// If no changes were made, the collection will be empty. 
        /// 
        public ICollection Changes 
        {
            get
            {
                return _changes; 
            }
        } 
 
        /// 
        /// The mechanism used to call the type-specific handler on the 
        /// target.
        /// 
        /// 
        /// The generic handler to call in a type-specific way. 
        /// 
        ///  
        /// The target to call the handler on. 
        /// 
        protected override void InvokeEventHandler(Delegate genericHandler, object genericTarget) 
        {
            TextChangedEventHandler handler;

            handler = (TextChangedEventHandler)genericHandler; 
            handler(genericTarget, this);
        } 
 
        private UndoAction _undoAction;
        private readonly ICollection _changes; 
    }

    #endregion TextChangedEvent
} 

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

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