Como: Sobrescrever o Método OnRender do Painel
This example shows how to override the OnRender method of Panel in order to add custom graphical effects to a layout element.
Exemplo
Use the OnRender method in order to add graphical effects to a rendered panel element. For example, you can use this method to add custom border or background effects. A DrawingContext object is passed as an argument, which provides methods for drawing shapes, text, images, or videos. As a result, this method is useful for customization of a panel object.
' Override the OnRender call to add a Background and Border to the OffSetPanel
Protected Overrides Sub OnRender(ByVal dc As DrawingContext)
Dim mySolidColorBrush As New SolidColorBrush()
mySolidColorBrush.Color = Colors.LimeGreen
Dim myPen As New Pen(Brushes.Blue, 10)
Dim myRect As New Rect(0, 0, 500, 500)
dc.DrawRectangle(mySolidColorBrush, myPen, myRect)
End Sub
// Override the OnRender call to add a Background and Border to the OffSetPanel
protected override void OnRender(DrawingContext dc)
{
SolidColorBrush mySolidColorBrush = new SolidColorBrush();
mySolidColorBrush.Color = Colors.LimeGreen;
Pen myPen = new Pen(Brushes.Blue, 10);
Rect myRect = new Rect(0, 0, 500, 500);
dc.DrawRectangle(mySolidColorBrush, myPen, myRect);
}