Glyph Class

Glyph Class

Represents a single user interface (UI) entity managed by an Adorner.

Namespace: System.Windows.Forms.Design.Behavior
Assembly: System.Design (in

public abstract class Glyph
public abstract class Glyph
public abstract class Glyph
Not applicable.

The sole purpose of a Glyph is to paint and hit test. A Glyph does not have a window handle (HWND), as it is rendered on the adorner window control of the BehaviorService. Each Glyph can have a Behavior associated with it. A successfully hit-tested Glyph has the opportunity to push a new or different Behavior onto the behavior stack of the BehaviorService.

For more information, see Behavior Service Overview.

The following example demonstrates how to create your own Glyph based class with Behavior associated with it. This code example is part of a larger example provided for the BehaviorService class.

class MyGlyph : Glyph
    Control control;
    BehaviorService behaviorSvc;

    public MyGlyph(BehaviorService behaviorSvc, Control control) : 
        base(new MyBehavior())
        this.behaviorSvc = behaviorSvc;
        this.control = control;

    public override Rectangle Bounds
            // Create a glyph that is 10x10 and sitting
            // in the middle of the control.  Glyph coordinates
            // are in adorner window coordinates, so we must map
            // using the behavior service.
            Point edge = behaviorSvc.ControlToAdornerWindow(control);
            Size size = control.Size;
            Point center = new Point(edge.X + (size.Width / 2), 
                edge.Y + (size.Height / 2));

            Rectangle bounds = new Rectangle(
                center.X - 5,
                center.Y - 5,

            return bounds;

    public override Cursor GetHitTest(Point p)
        // GetHitTest is called to see if the point is
        // within this glyph.  This gives us a chance to decide
        // what cursor to show.  Returning null from here means
        // the mouse pointer is not currently inside of the glyph.
        // Returning a valid cursor here indicates the pointer is
        // inside the glyph, and also enables our Behavior property
        // as the active behavior.
        if (Bounds.Contains(p))
            return Cursors.Hand;

        return null;

    public override void Paint(PaintEventArgs pe)
        // Draw our glyph. It is simply a blue ellipse.
        pe.Graphics.FillEllipse(Brushes.Blue, Bounds);

    // By providing our own behavior we can do something interesting
    // when the user clicks or manipulates our glyph.
    class MyBehavior : Behavior
        public override bool OnMouseUp(Glyph g, MouseButtons button)
            MessageBox.Show("Hey, you clicked the mouse here");
            return true; // indicating we processed this event.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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