protected override void OnPaint(PaintEventArgs e)
{
using (_renderer.LockGraphics(e.Graphics))
{
// White Background
_renderer.SetBrush(Color.White);
_renderer.SetSolidPen(Color.White);
_renderer.FillRectangle(e.ClipRectangle);
// Lag frame calculations
SetLagFramesArray();
List <RollColumn> visibleColumns;
if (HorizontalOrientation)
{
CalculateHorizontalColumnPositions(VisibleColumns.ToList());
visibleColumns = VisibleColumns
.Take(_horizontalColumnTops.Count(c => c < e.ClipRectangle.Height))
.ToList();
}
else
{
visibleColumns = _columns.VisibleColumns
.Where(c => c.Right > _hBar.Value)
.Where(c => c.Left - _hBar.Value < e.ClipRectangle.Width)
.ToList();
}
var firstVisibleRow = Math.Max(FirstVisibleRow, 0);
var visibleRows = HorizontalOrientation
? e.ClipRectangle.Width / CellWidth
: e.ClipRectangle.Height / CellHeight;
var lastVisibleRow = firstVisibleRow + visibleRows;
var needsColumnRedraw = HorizontalOrientation || e.ClipRectangle.Y < ColumnHeight;
if (visibleColumns.Any() && needsColumnRedraw)
{
DrawColumnBg(visibleColumns, e.ClipRectangle);
DrawColumnText(visibleColumns);
}
// Background
DrawBg(visibleColumns, e.ClipRectangle, firstVisibleRow, lastVisibleRow);
// Foreground
DrawData(visibleColumns, firstVisibleRow, lastVisibleRow);
DrawColumnDrag(visibleColumns);
DrawCellDrag(visibleColumns);
}
}
// TODO: this shouldn't be exposed. But in order to not expose it, each RollColumn must have a change callback, and all property changes must call it, it is quicker and easier to just call this when needed
public void ColumnsChanged()
{
int pos = 0;
var columns = VisibleColumns.ToList();
for (int i = 0; i < columns.Count; i++)
{
columns[i].Left = pos;
pos += columns[i].Width.Value;
columns[i].Right = pos;
}
DoChangeCallback();
}
protected internal IList <DataColumnBase> GetVisibleColumns()
{
return(VisibleColumns.ToList <DataColumnBase>());
}
protected internal IList <ITreeDataColumnElement> GetVisibleColumns()
{
return(VisibleColumns.ToList <ITreeDataColumnElement>());
}