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Jason Plank
185
Group By Question
posted

All,

Is there a way in the 9.1 UltraWinGrid to automatically expand all rows when the user groups by a new column.  My users want the grid to automatically expand all rows whenever they drag/drop a column header to the "Group By" box.  Is there a property or an event I can trap that allows me to know when this happens?  I thought that the "AfterSortChange" event might work, but it tells me the band that changed and not necessarily the column...

Thanks,
Jason

  • 469350
    Verified Answer
    Offline posted

    Hi Jason,

    You can keep track of the number of grouped columns in the BeforeSortChange, then see if it increased in the AfterSortChanged. 

    


            int groupedColumnsCount = 0;
            private void ultraGrid1_BeforeSortChange(object sender, BeforeSortChangeEventArgs e)
            {            
                this.groupedColumnsCount = 0;
                foreach (UltraGridColumn column in e.Band.SortedColumns)
                {
                    if (column.IsGroupByColumn)
                        groupedColumnsCount++;
                }
            }

            private void ultraGrid1_AfterSortChange(object sender, BandEventArgs e)
            {
                int newGroupedColumnsCount = 0;
                foreach (UltraGridColumn column in e.Band.SortedColumns)
                {
                    if (column.IsGroupByColumn)
                        newGroupedColumnsCount++;
                }

                if (newGroupedColumnsCount > this.groupedColumnsCount)
                {
                    UltraGrid grid = (UltraGrid)sender;
                    grid.Rows.ExpandAll(true);
                }
            }

     

    Actually, since BeforeSortChanged gives you both the band and the new SortedColumns, you could potentially count both in BeforeSortChanged and then just set a flag to expand everything in AfterSortChanged. But it doesn't really make much difference.