protected override void LoadViewState(object savedState)
{
object[] values = savedState as object[];
if (values == null)
{
_rowInfo = (RowInfo)savedState;
}
else
{
_rowInfo = (RowInfo)values[0];
_subtotalInfo = (SubtotalInfo)values[1];
}
//base.LoadViewState(savedState);
}
/// <summary>
/// Make ourselves a master row. This event is only expected to be received by the last master row.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void gv_DataBound(object sender, EventArgs e)
{
GridViewEx gv = this.Grid;
_lastDetailRow._subtotalInfo = _subtotalInfo;
_subtotalInfo = null;
if (_markupComparer != null)
{
_markupComparer.Dispose();
_markupComparer = null;
}
// Tell sequence fields to not use page index while computing row sequence
gv.Columns.Cast <DataControlField>()
.OfType <SequenceField>().ToList().ForEach(p => p.UsePageIndex = false);
}
/// <summary>
/// Initializes the value for each column whose sum is to be displayed in the footer,
/// is called during the first row of grid encountered and for then each time master row changes.
/// </summary>
/// <remarks>
/// The function evaluates value for each detail column and places these with in a variable of
/// type <see cref="SubtotalInfo"/>. However for any column to participate within the variable
/// they must be of type <see cref="INeedsSummaries" />. By this column defines that it agress
/// to the contract of being participating in the summing operation.
/// </remarks>
/// <param name="dataItem"></param>
/// <param name="rowIndex"></param>
private void InitializeSubTotals(object dataItem, int rowIndex)
{
_subtotalInfo = new SubtotalInfo(rowIndex); // { RowCounts = new int[col.DataFooterFields.Length] };
// First row of the master. Simply Initialize totals
var query = this.Grid.Columns.Cast <DataControlField>()
.Select((p, i) => new { Column = p as INeedsSummaries, Index = i })
.Where(p => p.Column != null);
foreach (var colInfo in query)
{
switch (colInfo.Column.DataSummaryCalculation)
{
case SummaryCalculationType.None:
case SummaryCalculationType.DataSource:
break;
case SummaryCalculationType.ValueSummation:
case SummaryCalculationType.ValueWeightedAverage:
if (colInfo.Column.DataFooterFields == null || colInfo.Column.DataFooterFields.Length == 0)
{
throw new InvalidOperationException("To compute totals, DataFooterFields must be specified");
}
SummaryData data = new SummaryData();
data.Values = new decimal?[colInfo.Column.DataFooterFields.Length];
for (int i = 0; i < data.Values.Length; ++i)
{
object obj = DataBinder.Eval(dataItem, colInfo.Column.DataFooterFields[i]);
if (obj != DBNull.Value)
{
data.Values[i] = Convert.ToDecimal(obj);
data.RowCount = 1;
}
}
_subtotalInfo.Subtotals.Add(colInfo.Index, data);
break;
default:
throw new NotImplementedException();
}
}
}
/// <summary>
/// If a detail row belonging to the next master is encountered, finalize our master status by
/// creating _dictMasterCells. Unhook all grid events and hook them to the new master.
/// </summary>
/// <remarks>
/// The function checks mark up of rows, if markup is not same this states that master is not same for both hence renders
/// master row. Since this is a special row so we have to explicitly unhook to <see cref="GridViewEx" /> <c>RowDataBound</c>
/// and <c>DataBound</c> events, then calling <c>InitializeSubTotals</c> for initializing master columns and after this the
/// class again hooks to <c>GridViewEx</c> <c>RowDataBound</c> and <c>DataBound</c> events. If markups are same then the
/// function perfoms row counts and summasion for all the child columns.
/// </remarks>
/// <param name="sender"></param>
/// <param name="e"></param>
private void gv_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (!e.Row.Visible)
{
// Ignore
return;
}
GridViewEx gv = this.Grid;
GridViewExMasterRow row = e.Row as GridViewExMasterRow;
if (row == null)
{
// Do nothing. This must be a normal row
return;
}
// Sharad 26 Feb 2010: Checking this.RowIndex instead of this.DataItemIndex to avoid special situation bug of
// subtotal and total
// GL 11 June, 2010: Now checking row.DataItemIndex instead of row.RowIndex as this was resulting into
// erronous sequencing in master-details reports when it was required to have new sequence for every master.
if (row.DataItemIndex == this.RowIndex)
{
// First row of the master. Simply Initialize totals. We get here only for the very first master row.
InitializeSubTotals(e.Row.DataItem, e.Row.RowIndex);
return;
}
// e.Row is one of the detail rows or a new master row
switch (e.Row.RowType)
{
case DataControlRowType.DataRow:
if (_markupComparer == null)
{
_markupComparer = new ControlMarkupComparer();
}
if (gv.MasterColumnIndexes.Any(p => !_markupComparer.MarkupSame(
this.Cells[p], e.Row.Cells[p])))
{
// First row of this master
gv.RowDataBound -= gv_RowDataBound;
gv.DataBound -= gv_DataBound;
row._rowInfo._masterRowIndex = _rowInfo._masterRowIndex + 1;
row._markupComparer = _markupComparer;
row._lastDetailRow = row;
row._rowInfo._indexWithinMaster = 0;
row.InitializeSubTotals(row.DataItem, row.DataItemIndex);
// first row of master is handing over the subtotals to the last row.
// The last row will be responsible for displaying them.
_lastDetailRow._subtotalInfo = _subtotalInfo;
_subtotalInfo = null;
gv.RowDataBound += row.gv_RowDataBound;
gv.DataBound += row.gv_DataBound;
}
else
{
// Subsequent row of this master
_lastDetailRow = row;
row._rowInfo._indexWithinMaster = this._rowInfo._countRowsInMaster;
++_rowInfo._countRowsInMaster;
_subtotalInfo.LastRowIndex = row.DataItemIndex;
var query = gv.Columns.Cast <DataControlField>()
.Select((p, i) => new { Column = p as INeedsSummaries, Index = i })
.Where(p => p.Column != null);
foreach (var colInfo in query)
{
switch (colInfo.Column.DataSummaryCalculation)
{
case SummaryCalculationType.None:
case SummaryCalculationType.DataSource:
// No subtotals
break;
case SummaryCalculationType.ValueSummation:
case SummaryCalculationType.ValueWeightedAverage:
SummaryData data = _subtotalInfo.Subtotals[colInfo.Index];
for (int i = 0; i < colInfo.Column.DataFooterFields.Length; ++i)
{
object obj = DataBinder.Eval(e.Row.DataItem, colInfo.Column.DataFooterFields[i]);
if (obj != DBNull.Value)
{
if (data.Values[i] == null)
{
data.Values[i] = Convert.ToDecimal(obj);
}
else
{
data.Values[i] += Convert.ToDecimal(obj);
}
++data.RowCount;
}
}
break;
default:
throw new NotImplementedException();
}
}
}
break;
}
}
