ColumnResizeUndoUnit.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / System / Windows / Documents / ColumnResizeUndoUnit.cs / 1 / ColumnResizeUndoUnit.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// File: ColumnResizeUndoUnit.cs
//
// Description: Undo unit for resizing columns 
//
// History: 
//  01/27/2005 : [....] - Created 
//
//--------------------------------------------------------------------------- 


using MS.Internal.Documents;
 

namespace System.Windows.Documents 
{ 

    internal class ColumnResizeUndoUnit : ParentUndoUnit 
    {

        #region Constructors
 
        internal ColumnResizeUndoUnit(TextPointer textPointerTable, int columnIndex, double[] columnWidths, double resizeAmount) : base("ColumnResize")
 
        { 
            _textContainer = textPointerTable.TextContainer;
            _cpTable = _textContainer.Start.GetOffsetToPosition(textPointerTable); 
            _columnWidths = columnWidths;
            _columnIndex = columnIndex;
            _resizeAmount = resizeAmount;
        } 

        #endregion Constructors 
 
        #region Public Methods
 
        /// 
        /// Perform the appropriate action for this unit.  If this is a parent undo unit, the
        /// parent must create an appropriate parent undo unit to contain the redo units.
        ///  
        public override void Do()
        { 
            UndoManager undoManager; 
            IParentUndoUnit redo;
            TextPointer textPointerTable; 
            Table table;

            undoManager = TopContainer as UndoManager;
            redo = null; 

            textPointerTable = new TextPointer(_textContainer.Start, _cpTable, LogicalDirection.Forward); 
            table = (Table) textPointerTable.Parent; 

            _columnWidths[_columnIndex] -= _resizeAmount; 
            if(_columnIndex < table.ColumnCount - 1)
            {
                _columnWidths[_columnIndex + 1] += _resizeAmount;
            } 

            if(undoManager != null && undoManager.IsEnabled) 
            { 
                redo = new ColumnResizeUndoUnit(textPointerTable, _columnIndex, _columnWidths, -_resizeAmount);
                undoManager.Open(redo); 
            }

            TextRangeEditTables.EnsureTableColumnsAreFixedSize(table, _columnWidths);
 
            if(redo != null)
            { 
                undoManager.Close(redo, UndoCloseAction.Commit); 
            }
 
        }

        #endregion Public Methods
 

        #region Private Data 
 
        private TextContainer _textContainer;
        private double[] _columnWidths; 
        private int _cpTable;
        private int _columnIndex;
        private double _resizeAmount;
 
        #endregion Private Data
    } 
} 

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

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