private void UpdateCaretPosition()
{
var rectangle = MainTextBox.GetRectFromCharacterIndex(MainTextBox.CaretIndex);
Caret.Height = rectangle.Bottom - rectangle.Top;
Canvas.SetTop(Caret, rectangle.Top);
Canvas.SetBottom(Caret, rectangle.Bottom);
var left = Canvas.GetLeft(Caret);
if (!double.IsNaN(left))
{
cursorAnimation.From = left;
cursorAnimation.To = rectangle.Right;
cursorAnimation.Duration = new Duration(TimeSpan.FromSeconds(.05));
Caret.BeginAnimation(Canvas.LeftProperty, cursorAnimation);
}
else
{
Canvas.SetLeft(Caret, rectangle.Right);
}
}