void richEditControl1_CustomMarkDraw(object sender, RichEditCustomMarkDrawEventArgs e)
{
if (e.VisualInfoCollection != null)
{
Dictionary <DocumentRange, Rectangle> table = new Dictionary <DocumentRange, Rectangle>();
foreach (CustomMarkVisualInfo viewInfo in e.VisualInfoCollection)
{
DocumentRange range = viewInfo.UserData as DocumentRange;
if (!table.ContainsKey(range))
{
table.Add(range, Rectangle.Empty);
}
DevExpress.XtraRichEdit.API.Native.CustomMark mark = this.richEditControl1.Document.CustomMarks.GetByVisualInfo(viewInfo);
Rectangle bounds = table[range];
Rectangle newBounds;
if (mark.Position == range.Start)
{
newBounds = Rectangle.FromLTRB(viewInfo.Bounds.Left, viewInfo.Bounds.Top, bounds.Right, bounds.Bottom);
}
else
{
newBounds = Rectangle.FromLTRB(bounds.Left, bounds.Top, viewInfo.Bounds.Right, viewInfo.Bounds.Bottom);
}
table[range] = newBounds;
}
using (Brush brush = new SolidBrush(Color.FromArgb(100, Color.Yellow))) {
foreach (Rectangle rect in table.Values)
{
e.Graphics.FillRectangle(brush, rect);
}
}
}
}
void ClearCustomMarks()
{
for (int i = Control.Document.CustomMarks.Count - 1; i >= 0; i--)
{
DevExpress.XtraRichEdit.API.Native.CustomMark mark = Control.Document.CustomMarks[i];
Control.Document.CustomMarks.Remove(mark);
}
}