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DesignerGlyph Class

Draws a glyph at the top-most Z order position on an activity designer.

Namespace:  System.Workflow.ComponentModel.Design
Assembly:  System.Workflow.ComponentModel (in System.Workflow.ComponentModel.dll)

'Declaration
Public MustInherit Class DesignerGlyph
'Usage
Dim instance As DesignerGlyph

The DesignerGlyph class is the base class for all designer glyphs used on a workflow design surface.

Activity designer developers can use classes that inherit from DesignerGlyph to draw custom glyphs onto the surface of an ActivityDesigner. DesignerGlyph classes draw such glyphs at the top-level Z order, which places the custom glyph visually on top of all other glyphs on the designer based on the Priority value of the custom glyph. A lower value for the Priority property indicates a higher priority and therefore draws the glyph at the top-most Z order position on an activity designer.

Notes to Inheritors:

When you inherit from DesignerGlyph, you must override the following members: OnPaint.

The following code example demonstrates a glyph class that derives from the DesignerGlyph class. The code overrides the GetBounds and OnPaint methods.

This code example is part of the Workflow Monitor SDK Sample from the DesignerGlyphProvider.cs file. For more information, see Workflow Monitor.

'Define a glyph to show an activity is executing, i.e. not 'closed' 
Friend Class ExecutingGlyph
    Inherits DesignerGlyph
    Public Overrides Function GetBounds(ByVal designer As System.Workflow.ComponentModel.Design.ActivityDesigner, ByVal activated As Boolean) As System.Drawing.Rectangle
        Dim imageBounds As Rectangle = Rectangle.Empty
        Dim image As Image = AppResources.Executing
        If Not image Is Nothing Then 
            Dim glyphSize As Size = WorkflowTheme.CurrentTheme.AmbientTheme.GlyphSize
            imageBounds.Location = New Point(designer.Bounds.Right - glyphSize.Width / 2, designer.Bounds.Top - glyphSize.Height / 2)
            imageBounds.Size = glyphSize
        End If 
        Return imageBounds
    End Function 

    Protected Overrides Sub OnPaint(ByVal graphics As System.Drawing.Graphics, ByVal activated As Boolean, ByVal ambientTheme As System.Workflow.ComponentModel.Design.AmbientTheme, ByVal designer As System.Workflow.ComponentModel.Design.ActivityDesigner)
        Dim bitmap As Bitmap = AppResources.Executing
        bitmap.MakeTransparent(Color.FromArgb(0, 255, 255))

        If Not bitmap Is Nothing Then
            graphics.DrawImage(bitmap, GetBounds(designer, activated), New Rectangle(Point.Empty, bitmap.Size), GraphicsUnit.Pixel)
        End If 
    End Sub 
End Class

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 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0
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