public string GetTextRange(TextPosition startPosition, TextPosition endPosition)
{
if (startPosition == (TextPosition)null)
{
throw new ArgumentNullException(nameof(startPosition));
}
if (endPosition == (TextPosition)null)
{
throw new ArgumentNullException(nameof(endPosition));
}
TextPosition.Swap(ref startPosition, ref endPosition);
StringBuilder stringBuilder = new StringBuilder();
ITextBlock textBlock1 = startPosition.TextBlock;
ITextBlock textBlock2 = endPosition.TextBlock;
if (object.Equals((object)textBlock1, (object)textBlock2))
{
return(this.GetBlockText(textBlock1, startPosition.CharPosition, endPosition.CharPosition - startPosition.CharPosition));
}
stringBuilder.Append(this.GetBlockText(textBlock1, startPosition.CharPosition, textBlock1.Length - startPosition.CharPosition));
for (int index = textBlock1.Index + 1; index < textBlock2.Index && index < this.Children.Count; ++index)
{
ITextBlock child = this.Children[index] as ITextBlock;
if (child != null)
{
stringBuilder.Append(this.GetBlockText(child, 0, child.Length));
}
}
stringBuilder.Append(this.GetBlockText(textBlock2, 0, endPosition.CharPosition));
return(stringBuilder.ToString());
}
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();
}
}
private void ClampSelection()
{
ITextBoxNavigator navigator = this.textBoxElement.Navigator;
TextPosition startPosition = navigator.SelectionStart;
TextPosition endPosition = navigator.SelectionEnd;
if (startPosition == (TextPosition)null || endPosition == (TextPosition)null)
{
return;
}
bool flag = false;
TextPosition.Swap(ref startPosition, ref endPosition);
if (TextBoxWrapPanel.IsLineFeed(startPosition.TextBlock.Text))
{
startPosition = navigator.GetNextPosition(startPosition);
startPosition.CharPosition = 0;
flag = true;
}
if (TextBoxWrapPanel.IsCarriageReturn(endPosition.TextBlock.Text))
{
endPosition = navigator.GetPreviousPosition(endPosition);
endPosition.CharPosition = endPosition.TextBlock.Length;
flag = true;
}
if (!flag)
{
return;
}
if (navigator.SelectionStart > navigator.SelectionEnd)
{
TextPosition textPosition = startPosition;
startPosition = endPosition;
endPosition = textPosition;
}
navigator.SuspendNotifications();
navigator.Select(startPosition, endPosition);
navigator.ResumeNotifications();
}
public bool Replace(TextPosition startPosition, TextPosition endPosition, string text)
{
TextPosition.Swap(ref startPosition, ref endPosition);
if (endPosition == (TextPosition)null && string.IsNullOrEmpty(text))
{
return(false);
}
TextBoxChangeAction action = TextBoxChangeAction.TextEdit;
int length = TextPosition.GetLength(startPosition, endPosition);
string textRange = this.GetTextRange(startPosition, endPosition);
if (textRange == text || !this.NotifyTextChanging((int)startPosition, length, textRange, text, action))
{
return(false);
}
int caretPosition = (int)startPosition + (string.IsNullOrEmpty(text) ? 0 : text.Length);
this.BeginEditUpdate();
this.ReplaceOverride(startPosition, endPosition, text);
this.InvalidateLayout();
this.Invalidate();
this.EndEditUpdate(true, text, caretPosition, action);
return(true);
}