ActivityDesignerPaint Class
Provides static methods used to draw user interface elements on activity designer surfaces. This class cannot be inherited.
Assembly: System.Workflow.ComponentModel (in System.Workflow.ComponentModel.dll)
The following example demonstrates a way to use the ActivityDesignerPaint class to draw a custom activity on the workflow design surface. A rounded rectangle is first drawn using the DrawRoundedRectangle method. Text is then drawn using DrawText and is placed at the location of the TextRectangle of the ActivityDesigner. Additionally, the Image associated with the ActivityDesigner is drawn using the DrawImage method of the ActivityDesignerPaint class. Finally, an expand button used by a CompositeActivity is drawn using the DrawExpandButton.
Private expandedValue As Boolean = True Private useBasePaintValue As Boolean = False Public Property UseBasePaint() As Boolean Get Return Me.useBasePaintValue End Get Set(ByVal value As Boolean) Me.useBasePaintValue = value End Set End Property Public Property Expanded() As Boolean Get Return Me.expandedValue End Get Set(ByVal value As Boolean) Me.expandedValue = value End Set End Property Protected Overrides Sub OnPaint(ByVal e As ActivityDesignerPaintEventArgs) If Me.UseBasePaint = True Then MyBase.OnPaint(e) Return End If DrawCustomActivity(e) End Sub Private Sub DrawCustomActivity(ByVal e As ActivityDesignerPaintEventArgs) Dim graphics As Graphics = e.Graphics Dim compositeDesignerTheme As CompositeDesignerTheme = CType(e.DesignerTheme, CompositeDesignerTheme) ActivityDesignerPaint.DrawRoundedRectangle(graphics, compositeDesignerTheme.BorderPen, Me.Bounds, compositeDesignerTheme.BorderWidth) Dim text As String = Me.Text Dim TextRectangle As Rectangle = Me.TextRectangle If Not String.IsNullOrEmpty(text) And Not TextRectangle.IsEmpty Then ActivityDesignerPaint.DrawText(graphics, compositeDesignerTheme.Font, text, TextRectangle, StringAlignment.Center, e.AmbientTheme.TextQuality, compositeDesignerTheme.ForegroundBrush) End If Dim Image As System.Drawing.Image = Me.Image Dim ImageRectangle As Rectangle = Me.ImageRectangle If Image IsNot Nothing And Not ImageRectangle.IsEmpty Then ActivityDesignerPaint.DrawImage(graphics, Image, ImageRectangle, DesignerContentAlignment.Fill) End If ActivityDesignerPaint.DrawExpandButton(graphics, _ New Rectangle(Me.Location.X, Me.Location.Y, 10, 10), _ Me.Expanded, _ compositeDesignerTheme) End Sub
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.