private static TextPointer GetPoint(FlowDocument document, int x)
{
TextPointer ret = document.ContentStart;
int i = 0;
while (ret != null && i < x)
{
if (ret.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
String textRun = ret.GetTextInRun(LogicalDirection.Forward);
i += textRun.Length;
ret = ret.GetPositionAtOffset(textRun.Length);
}
else
{
ret = ret.GetNextInsertionPosition(LogicalDirection.Forward);
i++;
}
}
return ret == null ? document.ContentEnd : ret;
}
/// <summary>
/// Searches for all chidren comboboxes and deattaches event handlers from them.
/// </summary>
private void DettachEventHandlersFromAllComboBoxes(FlowDocument document)
{
System.Diagnostics.Debug.WriteLine("Detaching eventhandlers from combobox statements");
for (TextPointer position = document.ContentStart;
position != null && position.CompareTo(document.ContentEnd) <= 0;
position = position.GetNextContextPosition(LogicalDirection.Forward))
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementEnd)
{
// process only UiElements. all other elements are ignored
InlineUIContainer uiContainer;
if ((uiContainer = position.Parent as InlineUIContainer) != null)
{
ComboBoxStatement statementBox = uiContainer.Child as ComboBoxStatement;
statementBox.ComboBoxDropDownOpened -= OnComboBoxStatementDropDownOpened;
statementBox.ComboBoxDropDownClosed -= OnComboBoxStatementDropDownClosed;
}
}
}
}
public TextRange FindWordFromPosition(TextPointer position, string word)
{
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Forward);
// Find the starting index of any substring that matches "word".
int indexInRun = textRun.IndexOf(word);
if (indexInRun >= 0)
{
TextPointer start = position.GetPositionAtOffset(indexInRun);
TextPointer end = start.GetPositionAtOffset(word.Length);
return(new TextRange(start, end));
}
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
// position will be null if "word" is not found.
return(null);
}
//A method i got from the internet to make my pointer work
private static TextPointer GetTextPointAt(TextPointer from, int pos)
{
TextPointer ret = from;
int i = 0;
while ((i < pos) && (ret != null))
{
if ((ret.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.Text) || (ret.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.None))
{
i++;
}
if (ret.GetPositionAtOffset(1, LogicalDirection.Forward) == null)
{
return(ret);
}
ret = ret.GetPositionAtOffset(1, LogicalDirection.Forward);
}
return(ret);
}
private void HighlightText(TextPointer position, string word)
{
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Forward);
// Find the starting index of any substring that matches "word".
int indexInRun = textRun.IndexOf(word);
if (indexInRun >= 0)
{
TextPointer start = position.GetPositionAtOffset(indexInRun);
TextPointer end = start.GetPositionAtOffset(word.Length);
new TextRange(start, end).ApplyPropertyValue(TextElement.FontWeightProperty, FontWeights.Bold);
}
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
}
private TextRange FindMatch(TextPointer position, string text)
{
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Forward);
int index = textRun.IndexOf(text);
if (index >= 0)
{
TextPointer start = position.GetPositionAtOffset(index);
TextPointer end = start.GetPositionAtOffset(text.Length);
return(new TextRange(start, end));
}
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
return(null);
}
static TextRange FindWordFromPosition(TextPointer position, string word)
{
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Forward);
int indexInRun = textRun.IndexOf(word, StringComparison.OrdinalIgnoreCase);
if (indexInRun >= 0)
{
TextPointer start = position.GetPositionAtOffset(indexInRun);
TextPointer end = start.GetPositionAtOffset(word.Length);
return(new TextRange(start, end));
}
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
return(null);
}
private static IEnumerable <TextElement> GetRunsAndParagraphs(FlowDocument doc)
{
for (TextPointer position = doc.ContentStart;
position != null && position.CompareTo(doc.ContentEnd) <= 0;
position = position.GetNextContextPosition(LogicalDirection.Forward))
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementEnd)
{
if (position.Parent is Run run)
{
yield return(run);
}
else
{
if (position.Parent is Paragraph para)
{
yield return(para);
}
}
}
}
}
/// <summary>
/// Converts flowDocument data to string between start and end textpointer
/// </summary>
/// <param name="start">start textpointer</param>
/// <param name="end">end textpointer</param>
/// <returns></returns>
public string ConvertFlowDocumentDataToStringWithinSelection(TextPointer start, TextPointer end)
{
// NOT WORKING - it should check if the start and end document are within the same document...
//if (start.IsInSameDocument(end))
//{
// throw new ArgumentException("Start and end pointers has to be within the same document.");
//}
StringBuilder codeBuilder = new StringBuilder();
for (TextPointer position = start;
position != null && position.CompareTo(end) <= 0;
position = position.GetNextContextPosition(LogicalDirection.Forward))
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementEnd)
{
// process only runs, paragraphs, and UiElements. all other elements are ignored
Paragraph paragraph;
Run run;
InlineUIContainer uiContainer;
if ((paragraph = position.Parent as Paragraph) != null)
{
codeBuilder.AppendLine();
}
else if ((run = position.Parent as Run) != null)
{
codeBuilder.Append(run.Text);
}
else if ((uiContainer = position.Parent as InlineUIContainer) != null)
{
ComboBoxStatement statementBox = uiContainer.Child as ComboBoxStatement;
codeBuilder.Append(statementBox.FormattedVisualStatement);
}
}
}
return(codeBuilder.ToString());
}
//TODO: see how we can reuse with AvalonEdit
// function to return all words in doc which match the regex pattern, then we send it to the formater
public static IEnumerable <TextRange> GetAllWordRanges(FlowDocument document, string pattern)
{
TextPointer pointer = document.ContentStart;
while (pointer != null)
{
if (pointer.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = pointer.GetTextInRun(LogicalDirection.Forward);
MatchCollection matches = Regex.Matches(textRun, pattern);
foreach (Match match in matches)
{
int startIndex = match.Index;
int length = match.Length;
TextPointer start = pointer.GetPositionAtOffset(startIndex);
TextPointer end = start.GetPositionAtOffset(length);
yield return(new TextRange(start, end));
}
}
pointer = pointer.GetNextContextPosition(LogicalDirection.Forward);
}
}
private void textChanged(object sender, TextChangedEventArgs e)
{
if (Document == null)
{
return;
}
TextRange documentRange = new TextRange(Document.ContentStart, Document.ContentEnd);
documentRange.ClearAllProperties();
TextPointer navigator = Document.ContentStart;
while (navigator.CompareTo(Document.ContentEnd) < 0)
{
TextPointerContext context = navigator.GetPointerContext(LogicalDirection.Backward);
if (context == TextPointerContext.ElementStart && navigator.Parent is Run)
{
CheckWordsInRun((Run)navigator.Parent);
}
navigator = navigator.GetNextContextPosition(LogicalDirection.Forward);
}
}
public TextRange FindWordFromPosition(TextPointer position, string word)
{
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Forward);
// Find the starting index of any substring that matches "word".
int indexInRun = textRun.IndexOf(word, StringComparison.InvariantCultureIgnoreCase);
if (indexInRun >= 0)
{
TextPointer start = position.GetPositionAtOffset(indexInRun);
TextPointer end = start.GetPositionAtOffset(word.Length);
return(new TextRange(start, end));
}
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
return(null);
}
private IEnumerable <TextElement> GetAnimatedBitmaps(TextRange range)
{
List <TextElement> list = new List <TextElement>();
for (TextPointer position = range.Start;
position != null && position.CompareTo(range.End) <= 0;
position = position.GetNextContextPosition(LogicalDirection.Forward))
{
if (position.GetPointerContext(LogicalDirection.Forward) ==
TextPointerContext.ElementEnd)
{
if (position.Parent is InlineUIContainer)
{
if ((position.Parent as InlineUIContainer).Child is AnimatedImage)
{
list.Add(position.Parent as TextElement);
}
}
}
}
return(list);
}
List <TextRange> FindWordFromPosition(TextPointer position, string word)
{
List <TextRange> ranges = new List <TextRange>();
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Forward);
// Find the starting index of any substring that matches "word".
int indexInRun = textRun.IndexOf(word);
if (indexInRun >= 0)
{
TextPointer start = position.GetPositionAtOffset(indexInRun);
TextPointer end = start.GetPositionAtOffset(word.Length);
ranges.Add(new TextRange(start, end));
}
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
return(ranges);
}
// </Snippet_TextPointer_TextPointer1>
// <Snippet_TextPointer_TextPointer2>
// This method will search for a specified word (string) starting at a specified position.
TextPointer FindWordFromPosition(TextPointer position, string word)
{
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Forward);
// Find the starting index of any substring that matches "word".
int indexInRun = textRun.IndexOf(word);
if (indexInRun >= 0)
{
position = position.GetPositionAtOffset(indexInRun);
break;
}
}
else
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
// position will be null if "word" is not found.
return position;
}
// Token: 0x0600686D RID: 26733 RVA: 0x001D7434 File Offset: 0x001D5634
internal IInputElement InputHitTest(int urOffset)
{
DependencyObject dependencyObject = null;
int num = this.CalculateUOffsetShift();
CharacterHit characterHitFromDistance;
if (this._line.HasOverflowed && this.TextParagraph.Properties.TextTrimming != TextTrimming.None)
{
Invariant.Assert(num == 0);
TextLine textLine = this._line.Collapse(new TextCollapsingProperties[]
{
this.GetCollapsingProps(this._wrappingWidth, this.TextParagraph.Properties)
});
Invariant.Assert(textLine.HasCollapsed, "Line has not been collapsed");
characterHitFromDistance = textLine.GetCharacterHitFromDistance(TextDpi.FromTextDpi(urOffset));
}
else
{
characterHitFromDistance = this._line.GetCharacterHitFromDistance(TextDpi.FromTextDpi(urOffset - num));
}
int cp = this._paraClient.Paragraph.ParagraphStartCharacterPosition + characterHitFromDistance.FirstCharacterIndex + characterHitFromDistance.TrailingLength;
TextPointer textPointer = TextContainerHelper.GetTextPointerFromCP(this._paraClient.Paragraph.StructuralCache.TextContainer, cp, LogicalDirection.Forward) as TextPointer;
if (textPointer != null)
{
TextPointerContext pointerContext = textPointer.GetPointerContext((characterHitFromDistance.TrailingLength == 0) ? LogicalDirection.Forward : LogicalDirection.Backward);
if (pointerContext == TextPointerContext.Text || pointerContext == TextPointerContext.ElementEnd)
{
dependencyObject = textPointer.Parent;
}
else if (pointerContext == TextPointerContext.ElementStart)
{
dependencyObject = textPointer.GetAdjacentElementFromOuterPosition(LogicalDirection.Forward);
}
}
return(dependencyObject as IInputElement);
}
TextPointer FindPointerAtTextOffset(TextPointer from, int offset, bool seekStart)
{
if (from == null)
{
return(null);
}
TextPointer current = from;
TextPointer end = from.DocumentEnd;
int charsToGo = offset;
while (current.CompareTo(end) != 0)
{
Run currentRun;
if (current.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text &&
(currentRun = current.Parent as Run) != null)
{
var remainingLengthInRun = current.GetOffsetToPosition(currentRun.ContentEnd);
if (charsToGo < remainingLengthInRun ||
(charsToGo == remainingLengthInRun && !seekStart))
{
return(current.GetPositionAtOffset(charsToGo));
}
charsToGo -= remainingLengthInRun;
current = currentRun.ElementEnd;
}
else
{
current = current.GetNextContextPosition(LogicalDirection.Forward);
}
}
if (charsToGo == 0 && !seekStart)
{
return(end);
}
return(null);
}
public void PaintSingleLineComments()
{
TextPointer position = editor.Document.ContentStart;
TextPointer endPosition;
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Forward);
// Find the starting index of any substring that matches "word".
int indexInRun = textRun.IndexOf("//");
if (indexInRun >= 0)
{
position = position.GetPositionAtOffset(indexInRun);
endPosition = position.GetLineStartPosition(1);
if (endPosition == null)
{
endPosition = position.GetPositionAtOffset(textRun.Length - 1);
}
TextRange tr = new TextRange(position, endPosition);
tr.ApplyPropertyValue(TextElement.ForegroundProperty,
(SolidColorBrush)(br.ConvertFrom("#C0C0C0")));
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
else
{
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
}
else
{
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
}
}
// <Snippet_TextPointer_GetNextContextPosition>
// This method will extract and return a string that contains a representation of
// the XAML structure of content elements in a given TextElement.
string GetXaml(TextElement element)
{
StringBuilder buffer = new StringBuilder();
// Position a "navigator" pointer before the opening tag of the element.
TextPointer navigator = element.ElementStart;
while (navigator.CompareTo(element.ElementEnd) < 0)
{
switch (navigator.GetPointerContext(LogicalDirection.Forward))
{
case TextPointerContext.ElementStart :
// Output opening tag of a TextElement
buffer.AppendFormat("<{0}>", navigator.GetAdjacentElement(LogicalDirection.Forward).GetType().Name);
break;
case TextPointerContext.ElementEnd :
// Output closing tag of a TextElement
buffer.AppendFormat("</{0}>", navigator.GetAdjacentElement(LogicalDirection.Forward).GetType().Name);
break;
case TextPointerContext.EmbeddedElement :
// Output simple tag for embedded element
buffer.AppendFormat("<{0}/>", navigator.GetAdjacentElement(LogicalDirection.Forward).GetType().Name);
break;
case TextPointerContext.Text :
// Output the text content of this text run
buffer.Append(navigator.GetTextInRun(LogicalDirection.Forward));
break;
}
// Advance the naviagtor to the next context position.
navigator = navigator.GetNextContextPosition(LogicalDirection.Forward);
} // End while.
return buffer.ToString();
} // End GetXaml method.
private void _CollectRangeProperties(TextRange TargetRange)
{
if (TargetRange != null)
{
_rangeProperty.Clear();
var start = TargetRange.Start;
var end = TargetRange.End;
int targetlength = TargetRange.Text.Length;
int totallength = 0;
TextPointer current = start;
int length = 0;
while (current.CompareTo(end) < 0)
{
if (current.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
length = current.GetTextRunLength(LogicalDirection.Forward);
totallength += length;
if (totallength > targetlength)
{
length = targetlength - totallength + length;
}
var ad = current.GetAdjacentElement(LogicalDirection.Forward);
var tempRange = new TextRange(current, current.GetPositionAtOffset(length, LogicalDirection.Forward));
var backgroundProperty = tempRange.GetPropertyValue(Run.BackgroundProperty);
_rangeProperty.Add(tempRange, backgroundProperty);
}
var nextPos = current.GetNextContextPosition(LogicalDirection.Forward);
if (nextPos.CompareTo(end) > 0)
{
break;
}
current = nextPos;
}
}
}
/// <summary>
/// Test if the text pointer is in a hyperlink
/// </summary>
/// <param name="pos"></param>
/// <returns></returns>
private bool searchHyperlink(TextPointer pos)
{
if (null == pos)
{
return(false);
}
TextPointerContext context = pos.GetPointerContext(LogicalDirection.Backward);
if (null == context)
{
return(false);
}
if (TextPointerContext.ElementStart == context)
{
object elem = pos.GetAdjacentElement(LogicalDirection.Backward);
if (elem is Hyperlink)
{
return(true);
}
}
else if (TextPointerContext.ElementEnd == context)
{
object elem = pos.GetAdjacentElement(LogicalDirection.Backward);
if (elem is Hyperlink)
{
return(false);
}
}
// go backwards...
TextPointer back = pos.GetNextContextPosition(LogicalDirection.Backward);
return(searchHyperlink(back));
}
// yield return returs object of IEnumerable type, each element one at a time
// *yield break: stops
private static IEnumerable <TextRange> ConvertWordsToTextRanges(FlowDocument doc)
{
TextPointer pointer = doc.ContentStart;
while (pointer != null) // While there is some more text
{
if (pointer.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = pointer.GetTextInRun(LogicalDirection.Forward);
MatchCollection matches = Regex.Matches(textRun, @"\w+");
foreach (Match match in matches)
{
int startIndex = match.Index; // First char
int length = match.Length; // The lenght
TextPointer start = pointer.GetPositionAtOffset(startIndex); // Gets to the first char
TextPointer end = start.GetPositionAtOffset(length); // Gets to the last char
yield return(new TextRange(start, end)); // Selects the match
}
}
pointer = pointer.GetNextContextPosition(LogicalDirection.Forward); // Checks if there is more text
}
}
private void OnTextChangedPrivate(object sender, TextChangedEventArgs e)
{
if (this.Document == null)
{
return;
}
TextRange docRange = new TextRange(this.Document.ContentStart, this.Document.ContentEnd);
docRange.ClearAllProperties();
TextPointer navigator = this.Document.ContentStart;
while ((navigator.CompareTo(this.Document.ContentEnd) < 0))
{
TextPointerContext context = navigator.GetPointerContext(LogicalDirection.Backward);
if ((context == TextPointerContext.ElementStart) && (navigator.Parent is System.Windows.Documents.Run))
{
CheckWordsInRun(navigator.Parent);
}
navigator = navigator.GetNextContextPosition(LogicalDirection.Forward);
}
FormatText();
}
TextRange FindWordFromPosition(TextPointer position, string word)
{
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
//带有内容的文本
string textRun = position.GetTextInRun(LogicalDirection.Forward);
//查找关键字在这文本中的位置
int indexInRun = textRun.IndexOf(word);
int indexHistory = 0;
while (indexInRun >= 0)
{
TextPointer start = position.GetPositionAtOffset(indexInRun + indexHistory);
TextPointer end = start.GetPositionAtOffset(word.Length);
return(new TextRange(start, end));
}
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
return(null);
}
void FindWordFromPosition(TextPointer position, string pattern)
{
while (position != null)
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
string textRun = position.GetTextInRun(LogicalDirection.Forward);
// Find the starting index of any substring that matches "word".
var r = new System.Text.RegularExpressions.Regex(pattern);
System.Text.RegularExpressions.Match m = r.Match(textRun);
TextPointer textPointerEnd = position;
{
var position_start = position.GetPositionAtOffset(m.Index);
textPointerEnd = position.GetPositionAtOffset(m.Index + m.Length);
TextRange tr = new TextRange(position_start, textPointerEnd);
tr.ApplyPropertyValue(TextElement.ForegroundProperty, Brushes.Blue);
}
}
position = position.GetNextContextPosition(LogicalDirection.Forward);
}
}
public ReadingWIndow(int fontSize, string path, int _TraversalSpeed, System.Windows.Media.Color color1)
{
try
{
this.path = path;
this.brush1 = new SolidColorBrush(color1);
this.textSize = fontSize;
InitializeComponent();
traversallTimer.Elapsed += new ElapsedEventHandler(TraversalEvent);
traversallTimer.Interval = 1000 / _TraversalSpeed;
StreamReader reader = new StreamReader(@path, Encoding.Default, true);
prompterText.AppendText(reader.ReadToEnd());
prompterText.FontSize = textSize;
prompterText.HorizontalAlignment = HorizontalAlignment.Center;
TextPointer text = prompterText.Document.ContentStart;
while (text.GetPointerContext(LogicalDirection.Forward) != TextPointerContext.Text)
{
text = text.GetNextContextPosition(LogicalDirection.Forward);
}
TextPointer startPos = text.GetPositionAtOffset(index);
TextPointer endPos = text.GetPositionAtOffset(index + 30);
prompterText.Selection.Select(startPos, endPos);
prompterText.SelectionBrush = brush1;
this.KeyDown += new KeyEventHandler(PrompterWindow_KeyDown_AsyncAndSync);
}
catch (Exception Ex)
{
MessageBox.Show(Ex.Message);
}
}
public static int ConvertTextPosition(this FlowDocument doc, TextPointer p)
{
int pos = 0;
for (TextPointer position = doc.ContentStart;
position != null && position.CompareTo(p) <= 0;
position = position.GetNextContextPosition(LogicalDirection.Forward))
{
if (position.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.ElementEnd)
{
//
}
else
{
TextPointer nextPosition = position.GetNextContextPosition(LogicalDirection.Forward);
if (position.Parent is Run)
{
Run run = position.Parent as Run;
TextPointer p1 = run.ContentStart;
TextPointer p2 = (nextPosition.CompareTo(p) <= 0) ? nextPosition : p;
int x2 = -p2.GetOffsetToPosition(p1);
pos += x2;
}
else if (position.Parent is InlineUIContainer)
{
InlineUIContainer inline = position.Parent as InlineUIContainer;
if (inline.Child is TextBox)
{
string variable = (inline.Child as TextBox).Tag as String;
pos += variable.Length + 2; // +2 for brackets
}
}
}
}
return(pos);
}
/// <summary>
/// Event handler for RichTextBox.TextChanged event.
/// </summary>
private void TextChangedEventHandler(object sender, TextChangedEventArgs e)
{
// Clear all formatting properties in the document.
// This is necessary since a paste command could have inserted text inside or at boundaries of a keyword from dictionary.
TextRange documentRange = new TextRange(this.Document.ContentStart, this.Document.ContentEnd);
documentRange.ClearAllProperties();
// Reparse the document to scan for matching words.
TextPointer navigator = this.Document.ContentStart;
while (navigator.CompareTo(this.Document.ContentEnd) < 0)
{
TextPointerContext context = navigator.GetPointerContext(LogicalDirection.Backward);
if (context == TextPointerContext.ElementStart && navigator.Parent is Run)
{
this.AddMatchingWordsInRun((Run)navigator.Parent);
}
navigator = navigator.GetNextContextPosition(LogicalDirection.Forward);
}
// Format words found.
this.FormatWords();
}
public static string GetTextBeforePointer(this RichTextBox rtb, TextPointer p, int length = 0)
{
StringBuilder stringBuilder = new StringBuilder();
while (p.CompareTo(rtb.Document.ContentStart) > 0)
{
if (p.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.Text)
{
stringBuilder.Insert(0, p.GetTextInRun(LogicalDirection.Backward));
if (length > 0 && stringBuilder.Length > length)
{
break;
}
}
p = p.GetNextContextPosition(LogicalDirection.Backward);
}
string text = stringBuilder.ToString();
if (length > 0 && text.Length > length)
{
text = text.Substring(text.Length - length);
}
return(text);
}
public static string GetTextAfterPointer(this RichTextBox rtb, TextPointer p, int length = 0)
{
var sb = new StringBuilder();
while (p.CompareTo(rtb.Document.ContentEnd) < 0)
{
if (p.GetPointerContext(LogicalDirection.Forward) == TextPointerContext.Text)
{
sb.Append(p.GetTextInRun(LogicalDirection.Forward));
if (length > 0 && sb.Length > length)
{
break;
}
}
p = p.GetNextContextPosition(LogicalDirection.Forward);
}
string text = sb.ToString();
if (length > 0 && text.Length > length)
{
text = text.Substring(0, length);
}
return(text);
}