RichEditControl.CustomMarkDraw Event

Fires before a custom mark is painted, and enables you to visualize the custom mark as required.

Namespace: DevExpress.XtraRichEdit

Assembly: DevExpress.XtraRichEdit.v20.1.dll

Declaration

public event RichEditCustomMarkDrawEventHandler CustomMarkDraw
Public Event CustomMarkDraw As RichEditCustomMarkDrawEventHandler

Event Data

The CustomMarkDraw event's data class is RichEditCustomMarkDrawEventArgs. The following properties provide information specific to this event:

Property Description
Graphics Gets an object used for painting.
VisualInfoCollection Provides access to information required to visualize custom marks.

Remarks

Use the CustomMarkCollection.Create method to create a mark, add it to the SubDocument.CustomMarks collection and visualize it by handling the CustomMarkDraw event.

Custommark

This code snippet illustrates the use of the CustomMarkCollection.Create method and the RichEditControl.CustomMarkDraw event, to add a mark to the selection and draw its visual representation.

using DevExpress.XtraRichEdit.API.Native;
using DevExpress.XtraRichEdit.Layout.Export;
using System.Drawing.Drawing2D;
        private void btn_Mark_Click(object sender, EventArgs e)
        {
            Document doc = richEditControl1.Document;
            CustomMark m = doc.CustomMarks.Create(doc.Selection.Start, Color.DarkOrange);   
        }

        private void richEditControl1_CustomMarkDraw(object sender, DevExpress.XtraRichEdit.RichEditCustomMarkDrawEventArgs e)
        {        
            foreach (CustomMarkVisualInfo info in e.VisualInfoCollection)
            {
                Document doc = richEditControl1.Document;
                CustomMark mark = doc.CustomMarks.GetByVisualInfo(info);
                e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;

                Color curColor = (Color)info.UserData;
                if (mark.Position < doc.Selection.Start) curColor = Color.Green;
                    Pen p = new Pen(curColor, 3);
                    p.StartCap = LineCap.Flat;
                    p.EndCap = LineCap.ArrowAnchor;
                    e.Graphics.DrawLine(p, new Point(0 , info.Bounds.Y), info.Bounds.Location);
            }
        }
See Also