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BeforeColPosChanged Event

Occurs before one or more columns have been moved, swapped, or sized.
Syntax
'Declaration
 
Public Event BeforeColPosChanged As BeforeColPosChangedEventHandler
public event BeforeColPosChangedEventHandler BeforeColPosChanged
Event Data

The event handler receives an argument of type BeforeColPosChangedEventArgs containing data related to this event. The following BeforeColPosChangedEventArgs properties provide information specific to this event.

PropertyDescription
Cancel (Inherited from System.ComponentModel.CancelEventArgs) 
ColumnHeaders The selected columns (read-only)
ColumnPosChangedType header position changed type (read-only)
Remarks

The action argument indicates which action will occur to the column or columns: moving, swapping, or sizing.

The columns argument returns a reference to a SelectedCols collection that can be used to retrieve references to the UltraGridColumn object or objects that will be moved, swapped, or sized. You can use this reference to access any of the returned collection's properties or methods, as well as the properties or methods of the objects within the collection. However, all properties of the affected columns are read-only in this event procedure.

The cancel argument enables you to programmatically prevent the column or columns from being moved, swapped, or sized. This argument can be used to prevent the user from moving, swapping, or sizing columns unless a certain condition is met. To prevent the user from attempting to move, swap, or size a column, set the AllowColMoving, AllowColSwapping, AllowColSizing properties, respectively.

This event is generated before one or more columns are moved, swapped, or sized, either programmatically, or by user interaction. Use UltraGridColumn's UltraGridColumn.Width property to resize it, ColumnHeader's ColumnHeader.SetVisiblePosition method to move it and UltraGridColumn.Swap method to swap the column. Using these properties and methods will cause this event to be raised.

The VisiblePosition property can be used to determine both the current and new positions of the column or columns that will be moved or swapped. New positions can be determined by reading the property off of the header of the column or columns in columns, while current positions can be determined by reading the property off of the header of the column or columns in the appropriate band.

The BeforeGroupPosChanged event is generated before one or more groups are moved, swapped, or sized.

The AfterColPosChanged event, which occurs after one or more columns are moved, swapped, or sized, is generated after this event, provided cancel is not set to True.

Example
Following code shows some of the information available in BeforeColPosChanged event.

For an overview of how to handle events in Visual Basic or Visual C#, see Event Handlers in Visual Basic and Visual C#. For specific information and code examples illustrating how to consume events in your application, see Consuming Events in the .NET Framework Developer's Guide.

Imports Infragistics.Shared
Imports Infragistics.Win
Imports Infragistics.Win.UltraWinGrid
Imports System.Diagnostics

   Private Sub UltraGrid1_BeforeColPosChanged(ByVal sender As Object, ByVal e As Infragistics.Win.UltraWinGrid.BeforeColPosChangedEventArgs) Handles ultraGrid1.BeforeColPosChanged

       ' BeforeColPosChanged gets fired when the user moves, swaps or resizes a column
       ' or columns. This event gives a chance to cancel the user action.

       If PosChanged.Moved = e.PosChanged Then

           ' One or more columns are being moved

           Dim columnList As String = ""

           Dim i As Integer
           For i = 0 To e.ColumnHeaders.Length - 1
               If i > 0 Then columnList = columnList & ", "

               columnList = columnList + e.ColumnHeaders(i).Column.Key
           Next

           Dim result As DialogResult = MessageBox.Show( _
               "You are about to move " & columnList & " columns. Do you want to continue ?", _
               "Confirm", MessageBoxButtons.YesNo, MessageBoxIcon.Question)

           If DialogResult.No = result Then
               ' Cancel the move by setting Cancel off the event args.
               e.Cancel = True
           End If

       ElseIf PosChanged.Swapped = e.PosChanged Then

           ' Two columns are being swapped.

           Dim result As DialogResult = MessageBox.Show( _
               "You are about to swap " & e.ColumnHeaders(0).Column.Key & " with " _
               + e.ColumnHeaders(1).Column.Key & " Do you want to continue ?", _
               "Confirm", MessageBoxButtons.YesNo, MessageBoxIcon.Question)

           If DialogResult.No = result Then
               ' Cancel the move by setting Cancel off the event args.
               e.Cancel = True
           End If

       ElseIf PosChanged.Sized = e.PosChanged Then

           ' A column is bieng resized.

           ' When a column is being resized, e.ColumnHeaders contains the column header that's
           ' being resized.
           Debug.WriteLine("User is about to resize " & e.ColumnHeaders(0).Column.Key & " colun.")

       End If

   End Sub
using Infragistics.Shared;
using Infragistics.Win;
using Infragistics.Win.UltraWinGrid;
using System.Diagnostics;

private void ultraGrid1_BeforeColPosChanged(object sender, Infragistics.Win.UltraWinGrid.BeforeColPosChangedEventArgs e)
{

	// BeforeColPosChanged gets fired when the user moves, swaps or resizes a column
	// or columns. This event gives a chance to cancel the user action.

	if ( PosChanged.Moved == e.PosChanged )
	{
		// One or more columns are being moved

		string columnList = "";
		
		for ( int i = 0; i < e.ColumnHeaders.Length; i++ )
		{
			if ( i > 0 )
				columnList = columnList + ", ";

			columnList = columnList + e.ColumnHeaders[i].Column.Key;
		}

		DialogResult result = MessageBox.Show( 
			"You are about to move " + columnList + " columns. Do you want to continue ?",
			"Confirm", MessageBoxButtons.YesNo, MessageBoxIcon.Question );

		if ( DialogResult.No == result )
		{
			// Cancel the move by setting Cancel off the event args.
			e.Cancel = true;
		}
	}
	else if ( PosChanged.Swapped == e.PosChanged )
	{
		// Two columns are being swapped.

		DialogResult result = MessageBox.Show( 
			"You are about to swap " + e.ColumnHeaders[0].Column.Key + " with " 
					+ e.ColumnHeaders[1].Column.Key + " Do you want to continue ?", 
			"Confirm", MessageBoxButtons.YesNo, MessageBoxIcon.Question );

		if ( DialogResult.No == result )
		{
			// Cancel the move by setting Cancel off the event args.
			e.Cancel = true;
		}
	}
	else if ( PosChanged.Sized == e.PosChanged )
	{
		// A column is bieng resized.

		// When a column is being resized, e.ColumnHeaders contains the column header that's
		// being resized.
		Debug.WriteLine( "User is about to resize " + e.ColumnHeaders[0].Column.Key + " colun." );
	}

}
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also