protected override void OnRender(DrawingContext drawingContext)
{
base.OnRender(drawingContext);
if (isVisible)
{
Brush caretBrush = this.CaretBrush;
if (caretBrush == null)
{
caretBrush = (Brush)textView.GetValue(TextBlock.ForegroundProperty);
}
Rect r = new Rect(caretRectangle.X - textView.HorizontalOffset,
caretRectangle.Y - textView.VerticalOffset,
caretRectangle.Width,
caretRectangle.Height);
drawingContext.DrawRectangle(caretBrush, null, PixelSnapHelpers.ToPixels(r));
}
}