protected List <ExpandedRowList> expandedRowList; //keeps track of all nodes shown in table
#region Overridden events
protected override void OnCellValueNeeded(DataGridViewCellValueEventArgs e)
{
if (CellValueNeeded == null)
{
throw new InvalidOperationException("TreeDataGridView requires at least one handler for CellValueNeeded");
}
// DataGridView may ask for cells after RowCount is set to 0 in order to commit changes
if (expandedRowList == null || e.RowIndex >= expandedRowList.Count)
{
return;
}
//converts row number into hierarchy list, understandable by user-specified value-retrieval function
var rowInfo = expandedRowList[e.RowIndex];
var cellValueEventArgs = new TreeDataGridViewCellValueEventArgs(e.ColumnIndex, rowInfo.RowIndexHierarchy);
CellValueNeeded(this, cellValueEventArgs);
e.Value = cellValueEventArgs.Value;
if (e.ColumnIndex == 0)
{
rowInfo.ChildRowCount = cellValueEventArgs.ChildRowCount;
rowInfo.HasChildRows = cellValueEventArgs.HasChildRows;
}
}
/// <summary>
/// Show child rows
/// </summary>
/// <param name="index">Which row to expand</param>
/// <param name="maxDepth">How far down to expand</param>
/// <returns></returns>
protected int expand(int index, int maxDepth)
{
var rowInfo = expandedRowList[index];
if (!rowInfo.HasChildRows || rowInfo.ExpandedChildRows.Count > 0 && maxDepth == 0)
{
return(0); // row already expanded, nothing to do
}
int rowsAdded = 0;
if (rowInfo.ExpandedChildRows.Count == 0)
{
if (!rowInfo.ChildRowCount.HasValue)
{
var e = new TreeDataGridViewChildRowCountNeededEventArgs(rowInfo.RowIndexHierarchy);
OnChildRowCountNeeded(e);
rowInfo.ChildRowCount = e.ChildRowCount;
}
var childRowList = new List <ExpandedRowList>(rowInfo.ChildRowCount.Value);
for (int j = 0; j < rowInfo.ChildRowCount; ++j)
{
//get the content of the child row and add it to list to be inserted
var childRowInfo = new ExpandedRowList(rowInfo.RowIndexHierarchy, j);
var cellValueEventArgs = new TreeDataGridViewCellValueEventArgs(0, childRowInfo.RowIndexHierarchy);
CellValueNeeded(this, cellValueEventArgs);
childRowInfo.ChildRowCount = cellValueEventArgs.ChildRowCount;
childRowInfo.HasChildRows = cellValueEventArgs.HasChildRows;
childRowList.Add(childRowInfo);
}
//insert new rows into table
rowInfo.ExpandedChildRows = childRowList;
expandedRowList.InsertRange(index + 1, childRowList);
rowsAdded = childRowList.Count;
}
//If more expansion is needed recurse back to the begining
if (maxDepth > rowInfo.RowIndexHierarchy.Count)
{
for (int j = 0; j < rowInfo.ChildRowCount; ++j)
{
rowsAdded += expand(index + rowsAdded + 1 - rowInfo.ChildRowCount.Value + j, maxDepth);
}
}
return(rowsAdded);
}
void dataGridView_CellValueNeeded(object sender, TreeDataGridViewCellValueEventArgs e)
{
var importSettingsRow = rows[e.RowIndexHierarchy[0]];
if (e.RowIndexHierarchy.Count == 1)
{
e.ChildRowCount = importSettingsRow.Analysis.parameters.Count;
if (e.ColumnIndex == analysisNameColumn.Index)
{
e.Value = importSettingsRow.Analysis.name;
}
else if (e.ColumnIndex == databaseColumn.Index)
{
e.Value = importSettingsRow.ImportSettings.proteinDatabaseFilepath;
}
else if (e.ColumnIndex == decoyPrefixColumn.Index)
{
e.Value = importSettingsRow.DecoyPrefix;
}
else if (e.ColumnIndex == maxFDRColumn.Index)
{
e.Value = importSettingsRow.ImportSettings.maxQValue;
}
else if (e.ColumnIndex == maxRankColumn.Index)
{
e.Value = importSettingsRow.ImportSettings.maxResultRank;
}
else if (e.ColumnIndex == ignoreUnmappedPeptidesColumn.Index)
{
e.Value = importSettingsRow.ImportSettings.ignoreUnmappedPeptides;
}
else if (e.ColumnIndex == qonverterSettingsColumn.Index)
{
e.Value = importSettingsRow.QonverterSettingsPreset;
}
}
else if (e.ColumnIndex == 0)
{
e.Value = importSettingsRow.Analysis.parameters.ElementAt(e.RowIndexHierarchy[1]).Key.Replace("Config: ", "");
}
else if (e.ColumnIndex == 1)
{
e.Value = importSettingsRow.Analysis.parameters.ElementAt(e.RowIndexHierarchy[1]).Value;
}
}
protected override void OnCellValuePushed(DataGridViewCellValueEventArgs e)
{
if (CellValuePushed == null)
{
return;
}
// DataGridView may ask for cells after RowCount is set to 0 in order to commit changes
if (expandedRowList == null || e.RowIndex >= expandedRowList.Count)
{
return;
}
//converts row number into hierarchy list, understandable by user-specified value-retrieval function
var rowInfo = expandedRowList[e.RowIndex];
var cellValueEventArgs = new TreeDataGridViewCellValueEventArgs(e.ColumnIndex, rowInfo.RowIndexHierarchy);
cellValueEventArgs.Value = e.Value;
CellValuePushed(this, cellValueEventArgs);
}
void dataGridView_CellValuePushed(object sender, TreeDataGridViewCellValueEventArgs e)
{
double temp;
var importSettingsRow = rows[e.RowIndexHierarchy[0]];
if (e.RowIndexHierarchy.Count == 1)
{
if (e.ColumnIndex == analysisNameColumn.Index)
{
importSettingsRow.Analysis.name = (string)e.Value;
}
else if (e.ColumnIndex == databaseColumn.Index)
{
importSettingsRow.ImportSettings.proteinDatabaseFilepath = (string)e.Value;
}
else if (e.ColumnIndex == decoyPrefixColumn.Index)
{
importSettingsRow.DecoyPrefix = (string)e.Value;
}
else if (e.ColumnIndex == maxFDRColumn.Index && double.TryParse(e.Value.ToString(), out temp))
{
importSettingsRow.ImportSettings.maxQValue = Convert.ToDouble(e.Value);
}
else if (e.ColumnIndex == maxRankColumn.Index)
{
importSettingsRow.ImportSettings.maxResultRank = Convert.ToInt32(e.Value);
}
else if (e.ColumnIndex == ignoreUnmappedPeptidesColumn.Index)
{
importSettingsRow.ImportSettings.ignoreUnmappedPeptides = (bool)e.Value;
}
else if (e.ColumnIndex == qonverterSettingsColumn.Index)
{
importSettingsRow.QonverterSettingsPreset = (string)e.Value;
}
}
}
private void treeDataGridView_CellValueNeeded (object sender, TreeDataGridViewCellValueEventArgs e)
{
if (e.RowIndexHierarchy.First() >= rows.Count)
{
e.Value = null;
return;
}
Row baseRow = rows[e.RowIndexHierarchy.First()];
for (int i = 1; i < e.RowIndexHierarchy.Count; ++i)
{
getChildren(baseRow); // populate ChildRows if necessary
baseRow = baseRow.ChildRows[e.RowIndexHierarchy[i]];
}
if (baseRow is AnalysisRow)
{
var row = baseRow as AnalysisRow;
e.ChildRowCount = row.Analysis.Parameters.Count;
}
e.Value = getCellValue(e.ColumnIndex, baseRow);
}
void dataGridView_CellValueNeeded(object sender, TreeDataGridViewCellValueEventArgs e)
{
var importSettingsRow = rows[e.RowIndexHierarchy[0]];
if (e.RowIndexHierarchy.Count == 1)
{
e.ChildRowCount = importSettingsRow.Analysis.parameters.Count;
if (e.ColumnIndex == analysisNameColumn.Index) e.Value = importSettingsRow.Analysis.name;
else if (e.ColumnIndex == databaseColumn.Index) e.Value = importSettingsRow.ImportSettings.proteinDatabaseFilepath;
else if (e.ColumnIndex == decoyPrefixColumn.Index) e.Value = importSettingsRow.DecoyPrefix;
else if (e.ColumnIndex == maxFDRColumn.Index) e.Value = importSettingsRow.ImportSettings.maxQValue;
else if (e.ColumnIndex == maxRankColumn.Index) e.Value = importSettingsRow.ImportSettings.maxResultRank;
else if (e.ColumnIndex == ignoreUnmappedPeptidesColumn.Index) e.Value = importSettingsRow.ImportSettings.ignoreUnmappedPeptides;
else if (e.ColumnIndex == qonverterSettingsColumn.Index) e.Value = importSettingsRow.QonverterSettingsPreset;
}
else if (e.ColumnIndex == 0) e.Value = importSettingsRow.Analysis.parameters.ElementAt(e.RowIndexHierarchy[1]).Key.Replace("Config: ", "");
else if (e.ColumnIndex == 1) e.Value = importSettingsRow.Analysis.parameters.ElementAt(e.RowIndexHierarchy[1]).Value;
}
void dataGridView_CellValuePushed(object sender, TreeDataGridViewCellValueEventArgs e)
{
double temp;
var importSettingsRow = rows[e.RowIndexHierarchy[0]];
if (e.RowIndexHierarchy.Count == 1)
{
if (e.ColumnIndex == analysisNameColumn.Index) importSettingsRow.Analysis.name = (string) e.Value;
else if (e.ColumnIndex == databaseColumn.Index) importSettingsRow.ImportSettings.proteinDatabaseFilepath = (string) e.Value;
else if (e.ColumnIndex == decoyPrefixColumn.Index) importSettingsRow.DecoyPrefix = (string) e.Value;
else if (e.ColumnIndex == maxFDRColumn.Index && double.TryParse(e.Value.ToString(), out temp)) importSettingsRow.ImportSettings.maxQValue = Convert.ToDouble(e.Value);
else if (e.ColumnIndex == maxRankColumn.Index) importSettingsRow.ImportSettings.maxResultRank = Convert.ToInt32(e.Value);
else if (e.ColumnIndex == ignoreUnmappedPeptidesColumn.Index) importSettingsRow.ImportSettings.ignoreUnmappedPeptides = (bool) e.Value;
else if (e.ColumnIndex == qonverterSettingsColumn.Index) importSettingsRow.QonverterSettingsPreset = (string) e.Value;
}
}
/// <summary>
/// Create symbols and/or images
/// </summary>
/// <param name="e"></param>
protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e)
{
if (expandedRowList == null)
{
base.OnCellPainting(e);
return;
}
//Only paint in the first column of each info-containing row
if (e.RowIndex < 0 || e.ColumnIndex != 0)
{
if (CellPainting != null)
{
var rowIndexHierarchy = e.RowIndex < 0 ? HeaderRowIndexHierarchy : expandedRowList[e.RowIndex].RowIndexHierarchy;
var e2 = new TreeDataGridViewCellPaintingEventArgs(this, e, rowIndexHierarchy);
CellPainting(this, e2);
if (e2.Handled)
{
e.Handled = true;
return;
}
}
base.OnCellPainting(e);
return;
}
var rowInfo = expandedRowList[e.RowIndex];
int nodeDepth = rowInfo.RowIndexHierarchy.Count - 1;
int iconWidth = 0;
if (CellPainting != null)
{
var e2 = new TreeDataGridViewCellPaintingEventArgs(this, e, rowInfo.RowIndexHierarchy);
CellPainting(this, e2);
if (e2.Handled)
{
e.Handled = true;
return;
}
}
e.Handled = true;
//Still show selection if row is selected
bool isSelected = (e.State & DataGridViewElementStates.Selected) == DataGridViewElementStates.Selected;
e.PaintBackground(e.CellBounds, isSelected);
Point symbolPoint = GetSymbolPoint(e.CellBounds, nodeDepth);
//Draw symbol if row is not in bottom node
if (rowInfo.HasChildRows)
{
var symbol = rowInfo.ExpandedChildRows.Count > 0 ? ExpandedSymbol : CollapsedSymbol;
var smoothingMode = e.Graphics.SmoothingMode;
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
//Go through and actually draw the stored symbol
var brush = new SolidBrush(isSelected ? e.CellStyle.SelectionForeColor : e.CellStyle.ForeColor);
var pen = new Pen(brush);
foreach (Symbol.Line line in symbol.Lines)
{
Point lineStart = line.Start, lineEnd = line.End;
lineStart.Offset(symbolPoint.X, symbolPoint.Y);
lineEnd.Offset(symbolPoint.X, symbolPoint.Y);
e.Graphics.DrawLine(pen, lineStart, lineEnd);
}
e.Graphics.SmoothingMode = smoothingMode;
}
//Draw icon if one is selected
if (CellIconNeeded != null)
{
var cellValueEventArgs = new TreeDataGridViewCellValueEventArgs(0, rowInfo.RowIndexHierarchy);
CellIconNeeded(this, cellValueEventArgs);
if (cellValueEventArgs.Value != null)
{
var icon = (Image)cellValueEventArgs.Value;
e.Graphics.DrawImage(icon, symbolPoint.X + SymbolWidth + 5, symbolPoint.Y - 3, 15, 15);
iconWidth = 20; //Indicates icon was drawn
}
}
//Paint cell info, taking previous images into account
var indentPadding = new Padding(symbolPoint.X - e.CellBounds.X + SymbolWidth + iconWidth + 2, 0, 0, 0);
e.CellStyle.Padding = indentPadding;
e.Paint(e.CellBounds, DataGridViewPaintParts.ContentForeground);
}
private void getChildRowCount (AggregateRow row, Grouping<GroupBy> childGrouping, TreeDataGridViewCellValueEventArgs e)
{
if (childGrouping == null)
{
if (checkedGroupings.Any(o => o.Mode == GroupBy.Spectrum || o.Mode == GroupBy.Peptide))
e.HasChildRows = true;
else
e.ChildRowCount = row.PeptideSpectrumMatches;
}
else if (childGrouping.Mode == GroupBy.Source)
{
var dataFilter = row.DataFilter;
if (dataFilter.SpectrumSourceGroup == null)
{
// create a filter from the cached root group for this data filter
var nonGroupParentFilterKey = new DataFilterKey(dataFilter);
var rootGroup = (getSpectrumSourceRows(dataFilter)[0] as SpectrumSourceGroupRow).SpectrumSourceGroup;
dataFilter = new DataFilter(row.DataFilter) { SpectrumSourceGroup = new List<SpectrumSourceGroup>() { rootGroup } };
}
e.ChildRowCount = getSpectrumSourceRows(dataFilter).Count;
}
else if (childGrouping.Mode == GroupBy.Spectrum)
e.ChildRowCount = row.Spectra;
else if (childGrouping.Mode == GroupBy.Analysis)
e.ChildRowCount = row.DistinctAnalyses;
else if (childGrouping.Mode == GroupBy.Peptide)
e.ChildRowCount = row.DistinctPeptides;
else if (childGrouping.Mode == GroupBy.Charge)
e.ChildRowCount = row.DistinctCharges;
else
throw new NotImplementedException();
}
private void treeDataGridView_CellValueNeeded (object sender, TreeDataGridViewCellValueEventArgs e)
{
if (e.RowIndexHierarchy.First() >= rows.Count)
{
e.Value = null;
return;
}
Row baseRow = GetRowFromRowHierarchy(e.RowIndexHierarchy);
Grouping<GroupBy> childGrouping = null;
if (baseRow is SpectrumSourceGroupRow)
{
var row = baseRow as SpectrumSourceGroupRow;
var nonGroupParentFilterKey = new DataFilterKey(new DataFilter(row.DataFilter) { SpectrumSourceGroup = null });
var cachedRowsBySource = rowsBySource[nonGroupParentFilterKey];
e.ChildRowCount = cachedRowsBySource.OfType<SpectrumSourceGroupRow>()
.Count(o => o.SpectrumSourceGroup.IsImmediateChildOf(row.SpectrumSourceGroup) /*&&
(findTextBox.Text == "Find..." || o.SpectrumSourceGroup.Name.Contains(findTextBox.Text))*/);
e.ChildRowCount += cachedRowsBySource.OfType<SpectrumSourceRow>()
.Count(o => o.SpectrumSource.Group != null &&
o.SpectrumSource.Group.Id == row.SpectrumSourceGroup.Id /*&&
(findTextBox.Text == "Find..." || o.SpectrumSource.Name.Contains(findTextBox.Text))*/);
if (e.ChildRowCount == 0 && findTextBox.Text == "Find...")
throw new InvalidDataException("no child rows for source group");
}
else if (baseRow is SpectrumSourceRow)
childGrouping = GroupingSetupControl<GroupBy>.GetChildGrouping(checkedGroupings, GroupBy.Source);
else if (baseRow is SpectrumRow)
childGrouping = GroupingSetupControl<GroupBy>.GetChildGrouping(checkedGroupings, GroupBy.Spectrum);
else if (baseRow is AnalysisRow)
childGrouping = GroupingSetupControl<GroupBy>.GetChildGrouping(checkedGroupings, GroupBy.Analysis);
else if (baseRow is PeptideRow)
childGrouping = GroupingSetupControl<GroupBy>.GetChildGrouping(checkedGroupings, GroupBy.Peptide);
else if (baseRow is ChargeRow)
childGrouping = GroupingSetupControl<GroupBy>.GetChildGrouping(checkedGroupings, GroupBy.Charge);
else if (baseRow is PeptideSpectrumMatchRow)
e.HasChildRows = true;
if (!e.ChildRowCount.HasValue && baseRow is AggregateRow)
getChildRowCount(baseRow as AggregateRow, childGrouping, e);
e.Value = getCellValue(e.ColumnIndex, baseRow);
}
private void treeDataGridView_CellIconNeeded (object sender, TreeDataGridViewCellValueEventArgs e)
{
if (e.RowIndexHierarchy.First() >= rows.Count)
{
e.Value = null;
return;
}
Row baseRow = GetRowFromRowHierarchy(e.RowIndexHierarchy);
if (baseRow is SpectrumSourceGroupRow) e.Value = Properties.Resources.XPfolder_closed;
else if (baseRow is SpectrumSourceRow) e.Value = Properties.Resources.file;
else if (baseRow is SpectrumRow) e.Value = Properties.Resources.SpectrumIcon;
else if (baseRow is PeptideSpectrumMatchRow) e.Value = Properties.Resources.PSMIcon;
else if (baseRow is PeptideRow) e.Value = Properties.Resources.Peptide;
}
/// <summary>
/// Show child rows
/// </summary>
/// <param name="index">Which row to expand</param>
/// <param name="maxDepth">How far down to expand</param>
/// <returns></returns>
protected int expand (int index, int maxDepth)
{
var rowInfo = expandedRowList[index];
if (!rowInfo.HasChildRows || rowInfo.ExpandedChildRows.Count > 0 && maxDepth == 0)
return 0; // row already expanded, nothing to do
int rowsAdded = 0;
if (rowInfo.ExpandedChildRows.Count == 0)
{
if (!rowInfo.ChildRowCount.HasValue)
{
var e = new TreeDataGridViewChildRowCountNeededEventArgs(rowInfo.RowIndexHierarchy);
OnChildRowCountNeeded(e);
rowInfo.ChildRowCount = e.ChildRowCount;
}
var childRowList = new List<ExpandedRowList>(rowInfo.ChildRowCount.Value);
for (int j = 0; j < rowInfo.ChildRowCount; ++j)
{
//get the content of the child row and add it to list to be inserted
var childRowInfo = new ExpandedRowList(rowInfo.RowIndexHierarchy, j);
var cellValueEventArgs = new TreeDataGridViewCellValueEventArgs(0, childRowInfo.RowIndexHierarchy);
CellValueNeeded(this, cellValueEventArgs);
childRowInfo.ChildRowCount = cellValueEventArgs.ChildRowCount;
childRowInfo.HasChildRows = cellValueEventArgs.HasChildRows;
childRowList.Add(childRowInfo);
}
//insert new rows into table
rowInfo.ExpandedChildRows = childRowList;
expandedRowList.InsertRange(index + 1, childRowList);
rowsAdded = childRowList.Count;
}
//If more expansion is needed recurse back to the begining
if (maxDepth > rowInfo.RowIndexHierarchy.Count)
for (int j = 0; j < rowInfo.ChildRowCount; ++j)
rowsAdded += expand(index + rowsAdded + 1 - rowInfo.ChildRowCount.Value + j, maxDepth);
return rowsAdded;
}
/// <summary>
/// Create symbols and/or images
/// </summary>
/// <param name="e"></param>
protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e)
{
if (expandedRowList == null)
{
base.OnCellPainting(e);
return;
}
//Only paint in the first column of each info-containing row
if (e.RowIndex < 0 || e.ColumnIndex != 0)
{
if (CellPainting != null)
{
var rowIndexHierarchy = e.RowIndex < 0 ? HeaderRowIndexHierarchy : expandedRowList[e.RowIndex].RowIndexHierarchy;
var e2 = new TreeDataGridViewCellPaintingEventArgs(this, e, rowIndexHierarchy);
CellPainting(this, e2);
if (e2.Handled)
{
e.Handled = true;
return;
}
}
base.OnCellPainting(e);
return;
}
var rowInfo = expandedRowList[e.RowIndex];
int nodeDepth = rowInfo.RowIndexHierarchy.Count - 1;
int iconWidth = 0;
if (CellPainting != null)
{
var e2 = new TreeDataGridViewCellPaintingEventArgs(this, e, rowInfo.RowIndexHierarchy);
CellPainting(this, e2);
if (e2.Handled)
{
e.Handled = true;
return;
}
}
e.Handled = true;
//Still show selection if row is selected
bool isSelected = (e.State & DataGridViewElementStates.Selected) == DataGridViewElementStates.Selected;
e.PaintBackground(e.CellBounds, isSelected);
Point symbolPoint = GetSymbolPoint(e.CellBounds, nodeDepth);
//Draw symbol if row is not in bottom node
if (rowInfo.HasChildRows)
{
var symbol = rowInfo.ExpandedChildRows.Count > 0 ? ExpandedSymbol : CollapsedSymbol;
var smoothingMode = e.Graphics.SmoothingMode;
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
//Go through and actually draw the stored symbol
var brush = new SolidBrush(isSelected ? e.CellStyle.SelectionForeColor : e.CellStyle.ForeColor);
var pen = new Pen(brush);
foreach (Symbol.Line line in symbol.Lines)
{
Point lineStart = line.Start, lineEnd = line.End;
lineStart.Offset(symbolPoint.X, symbolPoint.Y);
lineEnd.Offset(symbolPoint.X, symbolPoint.Y);
e.Graphics.DrawLine(pen, lineStart, lineEnd);
}
e.Graphics.SmoothingMode = smoothingMode;
}
//Draw icon if one is selected
if (CellIconNeeded != null)
{
var cellValueEventArgs = new TreeDataGridViewCellValueEventArgs(0, rowInfo.RowIndexHierarchy);
CellIconNeeded(this, cellValueEventArgs);
if (cellValueEventArgs.Value != null)
{
var icon = (Image)cellValueEventArgs.Value;
e.Graphics.DrawImage(icon, symbolPoint.X + SymbolWidth + 5, symbolPoint.Y - 3, 15, 15);
iconWidth = 20; //Indicates icon was drawn
}
}
//Paint cell info, taking previous images into account
var indentPadding = new Padding(symbolPoint.X - e.CellBounds.X + SymbolWidth + iconWidth + 2, 0, 0, 0);
e.CellStyle.Padding = indentPadding;
e.Paint(e.CellBounds, DataGridViewPaintParts.ContentForeground);
}
protected override void OnCellValuePushed(DataGridViewCellValueEventArgs e)
{
if (CellValuePushed == null)
return;
// DataGridView may ask for cells after RowCount is set to 0 in order to commit changes
if (expandedRowList == null || e.RowIndex >= expandedRowList.Count)
return;
//converts row number into hierarchy list, understandable by user-specified value-retrieval function
var rowInfo = expandedRowList[e.RowIndex];
var cellValueEventArgs = new TreeDataGridViewCellValueEventArgs(e.ColumnIndex, rowInfo.RowIndexHierarchy);
cellValueEventArgs.Value = e.Value;
CellValuePushed(this, cellValueEventArgs);
}
protected List<ExpandedRowList> expandedRowList; //keeps track of all nodes shown in table
#region Overridden events
protected override void OnCellValueNeeded (DataGridViewCellValueEventArgs e)
{
if (CellValueNeeded == null)
throw new InvalidOperationException("TreeDataGridView requires at least one handler for CellValueNeeded");
// DataGridView may ask for cells after RowCount is set to 0 in order to commit changes
if (expandedRowList == null || e.RowIndex >= expandedRowList.Count)
return;
//converts row number into hierarchy list, understandable by user-specified value-retrieval function
var rowInfo = expandedRowList[e.RowIndex];
var cellValueEventArgs = new TreeDataGridViewCellValueEventArgs(e.ColumnIndex, rowInfo.RowIndexHierarchy);
CellValueNeeded(this, cellValueEventArgs);
e.Value = cellValueEventArgs.Value;
if (e.ColumnIndex == 0)
{
rowInfo.ChildRowCount = cellValueEventArgs.ChildRowCount;
rowInfo.HasChildRows = cellValueEventArgs.HasChildRows;
}
}
