private void MultiSelectAdd(TreeListNode clickedNode, Keys modifierKeys)
{
if (Control.ModifierKeys == Keys.None)
{
foreach (TreeListNode node in NodesSelection)
{
int newrow = NodeCollection.GetVisibleNodeIndex(node);
InvalidateRow(newrow);
}
NodesSelection.Clear();
NodesSelection.Add(clickedNode);
}
if (Control.ModifierKeys == Keys.Shift)
{
if (NodesSelection.Count == 0)
{
NodesSelection.Add(clickedNode);
}
else
{
int startrow = NodeCollection.GetVisibleNodeIndex(NodesSelection[0]);
int currow = NodeCollection.GetVisibleNodeIndex(clickedNode);
if (currow > startrow)
{
TreeListNode startingNode = NodesSelection[0];
NodesSelection.Clear();
foreach (TreeListNode node in NodeCollection.ForwardNodeIterator(startingNode, clickedNode, true))
{
NodesSelection.Add(node);
}
Invalidate();
}
if (currow < startrow)
{
TreeListNode startingNode = NodesSelection[0];
NodesSelection.Clear();
foreach (TreeListNode node in NodeCollection.ReverseNodeIterator(startingNode, clickedNode, true))
{
NodesSelection.Add(node);
}
Invalidate();
}
}
}
if (Control.ModifierKeys == Keys.Control)
{
if (NodesSelection.Contains(clickedNode))
{
NodesSelection.Remove(clickedNode);
}
else
{
NodesSelection.Add(clickedNode);
}
}
InvalidateRow(NodeCollection.GetVisibleNodeIndex(clickedNode));
FocusedNode = clickedNode;
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
int hScrollOffset = HScrollValue();
int remainder = 0;
int visiblerows = MaxVisibleRows(out remainder);
if (remainder > 0)
{
visiblerows++;
}
bool drawColumnHeaders = true;
// draw columns
if (drawColumnHeaders)
{
Rectangle headerRect = e.ClipRectangle;
Columns.Draw(e.Graphics, headerRect, hScrollOffset);
}
// draw vertical grid lines
if (ViewOptions.ShowGridLines)
{
// visible row count
int remainRows = Nodes.VisibleNodeCount - m_vScroll.Value;
if (visiblerows > remainRows)
{
visiblerows = remainRows;
}
Rectangle fullRect = ClientRectangle;
if (drawColumnHeaders)
{
fullRect.Y += Columns.Options.HeaderHeight;
}
fullRect.Height = visiblerows * RowOptions.ItemHeight;
Columns.Painter.DrawVerticalGridLines(Columns, e.Graphics, fullRect, hScrollOffset);
}
int visibleRowIndex = 0;
TreeListColumn[] visibleColumns = this.Columns.VisibleColumns;
int columnsWidth = Columns.ColumnsWidth;
foreach (TreeListNode node in NodeCollection.ForwardNodeIterator(m_firstVisibleNode, true))
{
Rectangle rowRect = CalcRowRecangle(visibleRowIndex);
if (rowRect == Rectangle.Empty || rowRect.Bottom <= e.ClipRectangle.Top || rowRect.Top >= e.ClipRectangle.Bottom)
{
if (visibleRowIndex > visiblerows)
{
break;
}
visibleRowIndex++;
continue;
}
rowRect.X = RowHeaderWidth() - hScrollOffset;
rowRect.Width = columnsWidth;
// draw horizontal grid line for current node
if (ViewOptions.ShowGridLines)
{
Rectangle r = rowRect;
r.X = RowHeaderWidth();
r.Width = columnsWidth - hScrollOffset;
m_rowPainter.DrawHorizontalGridLine(e.Graphics, r);
}
// draw the current node
PaintNode(e.Graphics, rowRect, node, visibleColumns, visibleRowIndex);
// drow row header for current node
Rectangle headerRect = rowRect;
headerRect.X = 0;
headerRect.Width = RowHeaderWidth();
int absoluteRowIndex = visibleRowIndex + VScrollValue();
headerRect.Width = RowHeaderWidth();
m_rowPainter.DrawHeader(e.Graphics, headerRect, absoluteRowIndex == m_hotrow);
visibleRowIndex++;
}
}
