Can we Drag and Drop rows from one Groupby Band to Another

Drag and Drop Functionality works fine when no grouping is done. But once I did the group by, when I try to drag and drop within the same band, it is not happening.

What could be the problem

I think as GroupBy is done based on a column that sorts, it is not allowing drag and drop operation as it alters the sorting order. Because of this,probably it is not doing drag and drop, but if I remove the sortedcolumn entry before the drag starts, it is going against to my goal.

 LineItemsGrid.DisplayLayout.Bands(0).SortedColumns.RemoveAt(0)

The grid doesn't have any built-in ability to drag and drop rows. So if your drag/drop works okay when the grid is not grouped and doesn't work when it is grouped, then something is wrong with the code you are using to perform the drag/drop.

nag4054 said:

Where could be the problem?

Well, for one thing, every line of code you posted here is commented out. :)

But seriously... The problem is probably that the sample code doesn't account for grouping. It's always using the Move method on the grid's root-level rows collection. But the root-level rows collection will contain GroupByRows in your case. So this code is essentially trying to move a row from a child rows collection under a GroupByRow into the root-level collection.

You can't use the Move method in your case, anyway, because Move only works to move a row to a new position within the same Rows collection to which it already belongs. Moving a row from one group to another would require you to change the data in the row so that the row belongs to the new group.

nag4054 said:

Also Is there any way to cut and paste a complete row within a grid?

See the AllowMultiCellOperation property.

The Drag and Drop Code which I am using is the one which I got from one of the samples of infragistics.

Here it is:

 'Private Sub LineItemsGrid_DragDrop(ByVal sender As Object, ByVal e As System.Windows.Forms.DragEventArgs) Handles LineItemsGrid.DragDrop
    '    Dim dropIndex As Integer

    '    'Get the position on the grid where the dragged row(s) are to be dropped.
    '    'get the grid coordinates of the row (the drop zone)
    '    Dim uieOver As UIElement = LineItemsGrid.DisplayLayout.UIElement.ElementFromPoint(LineItemsGrid.PointToClient(New Point(e.X, e.Y)))

    '    'get the row that is the drop zone/or where the dragged row is to be dropped
    '    Dim ugrOver As UltraGridRow = TryCast(uieOver.GetContext(GetType(UltraGridRow), True), UltraGridRow)

    '    If ugrOver IsNot Nothing Then
    '        'index/position of drop zone in grid
    '        'band of the drop zone
    '        dstBand = ugrOver.Band
    '        dropIndex = ugrOver.Index
    '        'get the dragged row(s)which are to be dragged to another position in the grid
    '        Dim SelRows As SelectedRowsCollection = TryCast(DirectCast(e.Data.GetData(GetType(SelectedRowsCollection)), SelectedRowsCollection), SelectedRowsCollection)
    '        'get the count of selected rows and drop each starting at the dropIndex
    '        For Each aRow As UltraGridRow In SelRows
    '            'move the selected row(s) to the drop zone
    '            LineItemsGrid.Rows.Move(aRow, dropIndex)
    '             Next
    '    End If
    'End Sub

This code works fine when no grouping is done but when I groupby a particular column, it is not working.

Where could be the problem?

Also Is there any way to cut and paste a complete row within a grid?