public virtual bool ScrollToCaret()
{
TextBoxControlCaret caret = this.TextBoxElement.Caret;
RadScrollBarElement hscrollBar = this.textBoxElement.HScrollBar;
RadScrollBarElement vscrollBar = this.textBoxElement.VScrollBar;
if (caret == null || this.CaretPosition == (TextPosition)null)
{
vscrollBar.Value = vscrollBar.Minimum;
hscrollBar.Value = hscrollBar.Minimum;
return(false);
}
RectangleF boundingRectangle = (RectangleF)caret.ControlBoundingRectangle;
RectangleF viewportBounds = (RectangleF)this.TextBoxElement.ViewElement.ViewportBounds;
float num1 = 0.0f;
float num2 = 0.0f;
LineInfo line = this.CaretPosition.Line;
ITextBlock textBlock = this.CaretPosition.TextBlock;
int charPosition = this.CaretPosition.CharPosition;
if (textBlock == line.StartBlock && charPosition == 0)
{
num1 = (float)(hscrollBar.Minimum - hscrollBar.Value);
}
else if ((double)boundingRectangle.X > (double)viewportBounds.Right || (double)boundingRectangle.X < (double)viewportBounds.Left)
{
num1 = boundingRectangle.X - viewportBounds.X - viewportBounds.Width / 2f;
}
this.SetScrollBarValue(hscrollBar, hscrollBar.Value + (int)num1);
if (this.textBoxElement.Multiline)
{
if (line == this.textBoxElement.ViewElement.Lines.FirstLine)
{
num2 = (float)(vscrollBar.Minimum - vscrollBar.Value);
}
else if (line == this.textBoxElement.ViewElement.Lines.LastLine)
{
int num3 = this.textBoxElement.ViewElement.VScroller.MaxValue - 1;
if (num3 != 0)
{
num2 = (float)(num3 - vscrollBar.Value + 1);
}
}
else if ((double)boundingRectangle.Top < (double)viewportBounds.Top)
{
num2 = boundingRectangle.Top - viewportBounds.Top;
}
else if ((double)boundingRectangle.Bottom > (double)viewportBounds.Bottom)
{
num2 = boundingRectangle.Bottom - viewportBounds.Bottom;
}
this.SetScrollBarValue(vscrollBar, vscrollBar.Value + (int)num2);
}
return(true);
}
public virtual void SetCaretPosition()
{
if (this.selectionStart == (TextPosition)null)
{
return;
}
TextBoxControlCaret caret = this.textBoxElement.Caret;
TextPosition caretPosition = this.CaretPosition;
TextBoxViewElement viewElement = this.textBoxElement.ViewElement;
PointF location = viewElement.GetLocation(caretPosition);
SizeF scrollOffset = viewElement.ScrollOffset;
location.X += scrollOffset.Width;
location.Y += scrollOffset.Height;
caret.Height = (int)caretPosition.Line.Size.Height;
Point point = this.textBoxElement.PointFromControl(Point.Truncate(location));
caret.Position = point;
}