MonoGameUi.Textbox.OnDrawContent C# (CSharp) Method

        protected override void OnDrawContent(SpriteBatch batch, Rectangle area, GameTime gameTime, float alpha)
        {
            if (CursorPosition > Text.Length)
                CursorPosition = Text.Length;
            if (SelectionStart > Text.Length)
                SelectionStart = CursorPosition;
            // Selektion
            if (SelectionStart != CursorPosition)
            {
                int from = Math.Min(SelectionStart, CursorPosition);
                int to = Math.Max(SelectionStart, CursorPosition);
                var selectFrom = Font.MeasureString(Text.Substring(0, from));
                var selectTo = Font.MeasureString(Text.Substring(from, to - from));
                batch.Draw(Skin.Pix, new Rectangle(area.X + (int)selectFrom.X, area.Y, (int)selectTo.X, (int)selectTo.Y), Color.LightBlue);
            }

            base.OnDrawContent(batch, area, gameTime, alpha);

            // Cursor (wenn Fokus)
            if (Focused == TreeState.Active)
            {
                if ((int)gameTime.TotalGameTime.TotalSeconds % 2 == 0)
                {
                    var selectionSize = Font.MeasureString(Text.Substring(0, CursorPosition));
                    batch.Draw(Skin.Pix, new Rectangle(area.X + (int)selectionSize.X, area.Y, 1, Font.LineSpacing), TextColor);
                }
            }
        }