ActivityDesigner.OnPaint Method
Draws the visual representation of the activity at design time.
Assembly: System.Workflow.ComponentModel (in System.Workflow.ComponentModel.dll)
'Declaration Protected Overridable Sub OnPaint ( _ e As ActivityDesignerPaintEventArgs _ ) 'Usage Dim e As ActivityDesignerPaintEventArgs Me.OnPaint(e)
Parameters
- e
- Type: System.Workflow.ComponentModel.Design.ActivityDesignerPaintEventArgs
An ActivityDesignerPaintEventArgs that contains the event data.
| Exception | Condition |
|---|---|
| ArgumentNullException | e contains a null reference (Nothing in Visual Basic). |
The following example shows a custom ActivityDesigner that delegates the painting responsibility to the base class or draws itself based on a Boolean value. If useBasePaint is false, the custom activity will draw itself using the various methods of the ActivityDesignerPaint class.
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
- Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.
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.