/// <summary>
/// Gets the index of the first column corresponding to the specified flow direction.
/// </summary>
/// <param name="treeGrid">
/// The corresponding treeGrid to get the index of first column.
/// </param>
/// <param name="flowdirection">
/// Corresponding direction to get the index of first column.
/// </param>
/// <returns>
/// Returns the index of first column.
/// </returns>
public static int GetFirstColumnIndex(this SfTreeGrid treeGrid, FlowDirection flowdirection = FlowDirection.LeftToRight)
{
if (flowdirection == FlowDirection.RightToLeft)
{
return(treeGrid.GetLastColumnIndex());
}
int firstColumnIndex = treeGrid.Columns.IndexOf(treeGrid.Columns.FirstOrDefault(col => col.ActualWidth != 0d && !double.IsNaN(col.ActualWidth)));
//CurrentCell is updated when clicking on RowHeader when there is no columns in view, hence the below condition is added.
if (firstColumnIndex < 0)
{
return(firstColumnIndex);
}
firstColumnIndex = treeGrid.ResolveToScrollColumnIndex(firstColumnIndex);
return(firstColumnIndex);
}
/// <summary>
/// Get the index value for the next focused TreeGridColumn.
/// </summary>
/// <param name="TreeGrid"></param>
/// <param name="columnIndex"></param>
/// <returns></returns>
internal static int GetNextFocusTreeGridColumnIndex(this SfTreeGrid TreeGrid, int columnIndex, FlowDirection flowdirection = FlowDirection.LeftToRight)
{
if (flowdirection == FlowDirection.RightToLeft)
{
return(GetPreviousFocusTreeGridColumnIndex(TreeGrid, columnIndex));
}
var index = columnIndex;
if (index < 0 || index >= TreeGrid.Columns.Count)
{
return(-1);
}
var gridColumn = TreeGrid.Columns[index];
if (gridColumn == null || !gridColumn.AllowFocus || gridColumn.ActualWidth == 0.0 || double.IsNaN(gridColumn.ActualWidth))
{
if (columnIndex < TreeGrid.GetLastColumnIndex())
{
index = GetNextFocusTreeGridColumnIndex(TreeGrid, columnIndex + 1);
}
}
return(index);
}