protected override void OnPaint(PaintEventArgs e)
{
e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
e.Graphics.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
bool rtl = RightToLeft == RightToLeft.Yes;
AdjustScroll();
int startI = VerticalScroll.Value / ItemHeight - 1;
int finishI = (VerticalScroll.Value + ClientSize.Height) / ItemHeight + 1;
startI = Math.Max(startI, 0);
finishI = Math.Min(finishI, VisibleItems.Count);
int y = 0;
for (int i = startI; i < finishI; i++)
{
y = i * ItemHeight - VerticalScroll.Value;
if (ImageList != null && VisibleItems[i].ImageIndex >= 0)
{
if (rtl)
{
e.Graphics.DrawImage(ImageList.Images[VisibleItems[i].ImageIndex], Width - 1 - LeftPadding, y);
}
else
{
e.Graphics.DrawImage(ImageList.Images[VisibleItems[i].ImageIndex], 1, y);
}
}
var textRect = new Rectangle(LeftPadding, y, ClientSize.Width - 1 - LeftPadding, ItemHeight - 1);
if (rtl)
{
textRect = new Rectangle(1, y, ClientSize.Width - 1 - LeftPadding, ItemHeight - 1);
}
if (i == SelectedItemIndex)
{
Brush selectedBrush = new LinearGradientBrush(new Point(0, y - 3), new Point(0, y + ItemHeight),
Colors.SelectedBackColor2, Colors.SelectedBackColor);
e.Graphics.FillRectangle(selectedBrush, textRect);
using (var pen = new Pen(Colors.SelectedBackColor2))
e.Graphics.DrawRectangle(pen, textRect);
}
if (i == HighlightedItemIndex)
{
using (var pen = new Pen(Colors.HighlightingColor))
e.Graphics.DrawRectangle(pen, textRect);
}
var sf = new StringFormat();
if (rtl)
{
sf.FormatFlags = StringFormatFlags.DirectionRightToLeft;
}
var args = new PaintItemEventArgs(e.Graphics, e.ClipRectangle)
{
Font = Font,
TextRect = new RectangleF(textRect.Location, textRect.Size),
StringFormat = sf,
IsSelected = i == SelectedItemIndex,
IsHovered = i == HighlightedItemIndex,
Colors = Colors
};
//call drawing
VisibleItems[i].OnPaint(args);
args.Dispose();
}
}
public virtual void OnPaint(PaintItemEventArgs e)
{
using (var brush = new SolidBrush(e.IsSelected ? e.Colors.SelectedForeColor : e.Colors.ForeColor))
e.Graphics.DrawString(ToString(), e.Font, brush, e.TextRect, e.StringFormat);
}
