private void DrawPlusMinusButtons()
{
using (Graphics graphics = base.CreateGraphics())
{
foreach (object obj in base.Items)
{
DataTreeListViewItem dataTreeListViewItem = (DataTreeListViewItem)obj;
Rectangle bounds = dataTreeListViewItem.Bounds;
if (bounds.Bottom >= base.ClientRectangle.Top)
{
bounds.Width = base.Columns[0].Width;
bounds.Intersect(base.ClientRectangle);
if (!dataTreeListViewItem.IsLeaf && !bounds.IsEmpty && dataTreeListViewItem.ChildrenItems.Count > 0)
{
Region clip = graphics.Clip;
graphics.SetClip(LayoutHelper.MirrorRectangle(bounds, this));
DataTreeListView.DrawPlusMinusButton(graphics, LayoutHelper.MirrorRectangle(dataTreeListViewItem.GetPlusMinusButtonBound(), this), !dataTreeListViewItem.IsExpanded);
graphics.Clip = clip;
}
else if (bounds.Top > base.ClientRectangle.Bottom)
{
break;
}
}
}
}
}
