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//---------------------------------------------------------------------------
//
// File: ColumnResizeUndoUnit.cs
//
// Description: Undo unit for resizing columns
//
// History:
// 01/27/2005 : GHermann - 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
/// <summary>
/// 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.
/// </summary>
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
}
}
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