public virtual void Invalidate(
TextPosition selectionStart,
TextPosition selectionEnd,
bool repaint)
{
this.selectionPolygons = (RectangleF[])null;
TextBoxViewElement viewElement = this.textBoxElement.ViewElement;
if (object.Equals((object)selectionStart, (object)selectionEnd) || selectionEnd == (TextPosition)null)
{
viewElement.Invalidate();
}
else
{
TextPosition.Swap(ref selectionStart, ref selectionEnd);
LineInfo line1 = selectionStart.Line;
LineInfo line2 = selectionEnd.Line;
ReadOnlyCollection <LineInfo> lines = (ReadOnlyCollection <LineInfo>)viewElement.Lines;
int index = lines.IndexOf(line1);
int lineSpacing = viewElement.LineSpacing;
List <RectangleF> rectangleFList = new List <RectangleF>();
for (; index < lines.Count; ++index)
{
LineInfo currentLine = lines[index];
RectangleF rectangle = this.GetRectangle(currentLine);
if (currentLine == line1)
{
PointF location = viewElement.GetLocation(selectionStart);
rectangle.Width += rectangle.X - location.X;
rectangle.X = location.X;
}
if (currentLine == line2)
{
PointF location = viewElement.GetLocation(selectionEnd);
rectangle.Width = location.X - rectangle.X;
}
if (currentLine != line1)
{
rectangle.Y -= (float)lineSpacing;
rectangle.Height += (float)lineSpacing;
}
rectangleFList.Add(rectangle);
if (currentLine == line2)
{
break;
}
}
this.selectionPolygons = rectangleFList.ToArray();
if (!repaint)
{
return;
}
viewElement.Invalidate();
}
}
protected virtual TextPosition NavigateToLine(
KeyEventArgs keys,
TextPosition position)
{
Keys keyCode = keys.KeyCode;
TextBoxViewElement viewElement = this.textBoxElement.ViewElement;
ReadOnlyCollection <LineInfo> lines = (ReadOnlyCollection <LineInfo>)viewElement.Lines;
LineInfo line = position.Line;
int num = lines.IndexOf(line);
if (keyCode == Keys.Up && num > 0)
{
line = lines[num - 1];
}
else if (keyCode == Keys.Down && num < lines.Count - 1)
{
line = lines[num + 1];
}
if (position.Line == line)
{
return(position);
}
float x = viewElement.GetLocation(position).X + viewElement.ScrollOffset.Width;
return(this.GetTextPositionFromLine(line, x));
}
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;
}