// Token: 0x06002EE3 RID: 12003 RVA: 0x000D3B5C File Offset: 0x000D1D5C
internal override ITextPointer GetNextCaretUnitPosition(ITextPointer position, LogicalDirection direction)
{
FixedTextPointer ftp = this.Container.VerifyPosition(position);
FixedPosition fixedPosition;
if (this._GetFixedPosition(ftp, out fixedPosition))
{
DependencyObject element = this.FixedPage.GetElement(fixedPosition.Node);
if (element is Glyphs)
{
Glyphs glyphs = (Glyphs)element;
GlyphRun glyphRun = glyphs.ToGlyphRun();
int num = (glyphRun.Characters == null) ? 0 : glyphRun.Characters.Count;
CharacterHit characterHit = (fixedPosition.Offset == num) ? new CharacterHit(fixedPosition.Offset - 1, 1) : new CharacterHit(fixedPosition.Offset, 0);
CharacterHit obj = (direction == LogicalDirection.Forward) ? glyphRun.GetNextCaretCharacterHit(characterHit) : glyphRun.GetPreviousCaretCharacterHit(characterHit);
if (!characterHit.Equals(obj))
{
LogicalDirection edge = LogicalDirection.Forward;
if (obj.TrailingLength > 0)
{
edge = LogicalDirection.Backward;
}
int offset = obj.FirstCharacterIndex + obj.TrailingLength;
return(this._CreateTextPointer(new FixedPosition(fixedPosition.Node, offset), edge));
}
}
}
ITextPointer textPointer = position.CreatePointer();
textPointer.MoveToNextInsertionPosition(direction);
return(textPointer);
}
// Candidate for replacing MoveToNextInsertionPosition for immutable TextPointer model
ITextPointer ITextPointer.GetNextInsertionPosition(LogicalDirection direction)
{
ITextPointer pointer = ((ITextPointer)this).CreatePointer();
if (pointer.MoveToNextInsertionPosition(direction))
{
pointer.Freeze();
}
else
{
pointer = null;
}
return(pointer);
}
/// <summary>
/// Finds the next position at the edge of a caret unit in
/// specified direction.
/// </summary>
/// <param name="position">
/// Initial text position of an object/character.
/// </param>
/// <param name="direction">
/// If Forward, this method returns the "caret unit" position following
/// the initial position.
/// If Backward, this method returns the caret unit" position preceding
/// the initial position.
/// </param>
/// <returns>
/// The next caret unit break position in specified direction.
/// </returns>
/// <exception cref="System.InvalidOperationException">
/// Throws InvalidOperationException if IsValid is false.
/// If IsValid returns false, Validate method must be called before
/// calling this method.
/// </exception>
/// <remarks>
/// In the context of this method, "caret unit" refers to a group of one
/// or more Unicode code points that map to a single rendered glyph.
///
/// If position is located between two caret units, this method returns
/// a new position located at the opposite edge of the caret unit in
/// the indicated direction.
/// If position is located within a group of Unicode code points that map
/// to a single caret unit, this method returns a new position at
/// the indicated edge of the containing caret unit.
/// If position is located at the beginning of end of content -- there is
/// no content in the indicated direction -- then this method returns
/// a position located at the same location as initial position.
/// </remarks>
internal override ITextPointer GetNextCaretUnitPosition(ITextPointer position, LogicalDirection direction)
{
FixedTextPointer ftp = Container.VerifyPosition(position);
FixedPosition fixedp;
if (_GetFixedPosition(ftp, out fixedp))
{
DependencyObject element = this.FixedPage.GetElement(fixedp.Node);
if (element is Glyphs)
{
Glyphs g = (Glyphs)element;
GlyphRun run = g.ToGlyphRun();
int characterCount = (run.Characters == null) ? 0 : run.Characters.Count;
CharacterHit start = (fixedp.Offset == characterCount) ?
new CharacterHit(fixedp.Offset - 1, 1) :
new CharacterHit(fixedp.Offset, 0);
CharacterHit next = (direction == LogicalDirection.Forward) ?
run.GetNextCaretCharacterHit(start) :
run.GetPreviousCaretCharacterHit(start);
if (!start.Equals(next))
{
LogicalDirection edge = LogicalDirection.Forward;
if (next.TrailingLength > 0)
{
edge = LogicalDirection.Backward;
}
int index = next.FirstCharacterIndex + next.TrailingLength;
return(_CreateTextPointer(new FixedPosition(fixedp.Node, index), edge));
}
}
}
//default behavior is to simply move textpointer
ITextPointer pointer = position.CreatePointer();
pointer.MoveToNextInsertionPosition(direction);
return(pointer);
}
// Token: 0x0600535A RID: 21338 RVA: 0x00172AC8 File Offset: 0x00170CC8
private void Select(int start, int length)
{
if (start < 0)
{
throw new ArgumentOutOfRangeException("start", SR.Get("ParameterCannotBeNegative"));
}
if (length < 0)
{
throw new ArgumentOutOfRangeException("length", SR.Get("ParameterCannotBeNegative"));
}
ITextPointer textPointer = this.TextContainer.Start.CreatePointer();
while (start-- > 0 && textPointer.MoveToNextInsertionPosition(LogicalDirection.Forward))
{
}
ITextPointer textPointer2 = textPointer.CreatePointer();
while (length-- > 0 && textPointer2.MoveToNextInsertionPosition(LogicalDirection.Forward))
{
}
this.Selection.Select(textPointer, textPointer2);
}
// Token: 0x060062D3 RID: 25299 RVA: 0x001BB8C4 File Offset: 0x001B9AC4
private static IList <IAttachedAnnotation> GetSpannedAnnotationsForFlow(AnnotationService service, ITextSelection selection)
{
Invariant.Assert(service != null);
ITextPointer textPointer = selection.Start.CreatePointer();
ITextPointer textPointer2 = selection.End.CreatePointer();
textPointer.MoveToNextInsertionPosition(LogicalDirection.Backward);
textPointer2.MoveToNextInsertionPosition(LogicalDirection.Forward);
ITextRange selection2 = new TextRange(textPointer, textPointer2);
IList <ContentLocatorBase> list = service.LocatorManager.GenerateLocators(selection2);
Invariant.Assert(list != null && list.Count > 0);
TextSelectionProcessor textSelectionProcessor = service.LocatorManager.GetSelectionProcessor(typeof(TextRange)) as TextSelectionProcessor;
TextSelectionProcessor textSelectionProcessor2 = service.LocatorManager.GetSelectionProcessor(typeof(TextAnchor)) as TextSelectionProcessor;
Invariant.Assert(textSelectionProcessor != null, "TextSelectionProcessor should be available for TextRange if we are processing flow content.");
Invariant.Assert(textSelectionProcessor2 != null, "TextSelectionProcessor should be available for TextAnchor if we are processing flow content.");
IList <IAttachedAnnotation> result = null;
try
{
textSelectionProcessor.Clamping = false;
textSelectionProcessor2.Clamping = false;
ContentLocator contentLocator = list[0] as ContentLocator;
Invariant.Assert(contentLocator != null, "Locators for selection in Flow should always be ContentLocators. ContentLocatorSets not supported.");
contentLocator.Parts[contentLocator.Parts.Count - 1].NameValuePairs.Add("IncludeOverlaps", bool.TrueString);
IList <Annotation> annotations = service.Store.GetAnnotations(contentLocator);
result = AnnotationHelper.ResolveAnnotations(service, annotations);
}
finally
{
textSelectionProcessor.Clamping = true;
textSelectionProcessor2.Clamping = true;
}
return(result);
}
/// <summary>
/// Moves the navigator in the given direction to a position of the next
/// word boundary.
/// </summary>
/// <param name="thisNavigator">ITextPointer to advance.</param>
/// <param name="movingDirection">
/// Direction to move.
/// </param>
/// <returns></returns>
//
internal static bool MoveToNextWordBoundary(ITextPointer thisNavigator, LogicalDirection movingDirection)
{
int moveCounter = 0;
Invariant.Assert(!thisNavigator.IsFrozen, "Can't reposition a frozen pointer!");
ITextPointer startPosition = thisNavigator.CreatePointer();
while (thisNavigator.MoveToNextInsertionPosition(movingDirection))
{
moveCounter++;
// Need to break the loop for weird case when there is no word break in text content.
// When the word looks too long, consider end of textRun as a word break.
//
if (moveCounter > 64) // 64 was taken as a random number. Probably not big enough though...
{
thisNavigator.MoveToPosition(startPosition);
thisNavigator.MoveToNextContextPosition(movingDirection);
break;
}
if (IsAtWordBoundary(thisNavigator, /*insideWordDirection:*/LogicalDirection.Forward))
{
// Note that we always use Forward direction for word orientation.
break;
}
}
return moveCounter > 0;
}
/// <summary>
/// Re-positions the given position by an integral number of text units, but it does
/// not guarantee that position is snapped to TextUnit boundary.
/// This method assumes that input position is already snapped to appropriate TextUnit boundary.
/// </summary>
/// <param name="position">The position to move</param>
/// <param name="unit">Text units to step by</param>
/// <param name="count">Number of units to step over. Also specifies the direction of moving:
/// forward if positive, backward otherwise</param>
/// <returns>The actual number of units the position was moved over</returns>
private int MovePositionByUnits(ITextPointer position, TextUnit unit, int count)
{
ITextView textView;
int moved = 0;
int absCount = (count == int.MinValue) ? int.MaxValue : Math.Abs(count);
LogicalDirection direction = (count > 0) ? LogicalDirection.Forward : LogicalDirection.Backward;
// This method assumes that position is already snapped to appropriate TextUnit.
switch (unit)
{
case TextUnit.Character:
while (moved < absCount)
{
if (!TextPointerBase.MoveToNextInsertionPosition(position, direction))
{
break;
}
moved++;
}
break;
case TextUnit.Word:
while (moved < absCount)
{
if (!MoveToNextWordBoundary(position, direction))
{
break;
}
moved++;
}
break;
case TextUnit.Format:
// Formatting changes can be introduced by elements. Hence it is fair to
// assume that formatting boundaries are defined by non-text context.
while (moved < absCount)
{
ITextPointer positionOrig = position.CreatePointer();
// First skip all text in given direction.
while (position.GetPointerContext(direction) == TextPointerContext.Text)
{
if (!position.MoveToNextContextPosition(direction))
{
break;
}
}
// Move to next context
if (!position.MoveToNextContextPosition(direction))
{
break;
}
// Skip all formatting elements and position the pointer next to text.
while (position.GetPointerContext(direction) != TextPointerContext.Text)
{
if (!position.MoveToNextContextPosition(direction))
{
break;
}
}
// If moving backwards, position the pointer at the beginning of formatting range.
if (direction == LogicalDirection.Backward)
{
while (position.GetPointerContext(LogicalDirection.Backward) == TextPointerContext.Text)
{
if (!position.MoveToNextContextPosition(LogicalDirection.Backward))
{
break;
}
}
}
if (position.GetPointerContext(direction) != TextPointerContext.None)
{
moved++;
}
else
{
position.MoveToPosition(positionOrig);
break;
}
}
// Adjust logical direction to point to the following text (forward or backward movement).
// If we don't do this, we'll normalize in the wrong direction and get stuck in a loop
// if caller tries to advance again.
position.SetLogicalDirection(LogicalDirection.Forward);
break;
case TextUnit.Line:
// Position is snapped to nearest line boundary. But since line information
// is based on the layout, position is not changed, if:
// a) it is not currently in the view, or
// b) containing line cannot be found.
textView = _textAdaptor.GetUpdatedTextView();
if (textView != null && textView.IsValid && textView.Contains(position))
{
// ITextPointer.MoveToLineBoundary can't handle Table row end positions.
// Mimic TextEditor's caret navigation code and move into the preceding
// TableCell.
if (TextPointerBase.IsAtRowEnd(position))
{
position.MoveToNextInsertionPosition(LogicalDirection.Backward);
}
moved = position.MoveToLineBoundary(count);
MoveToInsertionPosition(position, LogicalDirection.Forward);
if (moved < 0)
{
moved = -moved; // Will be reversed below.
}
}
break;
case TextUnit.Paragraph:
// Utilize TextRange logic to determine paragraph boundaries.
ITextRange paragraphRange = new TextRange(position, position);
paragraphRange.SelectParagraph(position);
while (moved < absCount)
{
position.MoveToPosition(direction == LogicalDirection.Forward ? paragraphRange.End : paragraphRange.Start);
if (!position.MoveToNextInsertionPosition(direction))
{
break;
}
moved++;
paragraphRange.SelectParagraph(position);
position.MoveToPosition(paragraphRange.Start); // Position it always at the beginning of the paragraph.
}
break;
case TextUnit.Page:
// But since page information is based on the layout, position is not changed, if:
// a) it is not currently in the view, or
// b) containing page cannot be found.
// Page movement is possible only in multi-page scenario.
textView = _textAdaptor.GetUpdatedTextView();
if (textView != null && textView.IsValid && textView.Contains(position))
{
if (textView is MultiPageTextView)
{
// Get embedded page ITextView for given position.
ITextView pageTextView = ((MultiPageTextView)textView).GetPageTextViewFromPosition(position);
ReadOnlyCollection<TextSegment> textSegments = pageTextView.TextSegments;
while (moved < absCount)
{
if (textSegments == null || textSegments.Count == 0)
{
break;
}
// Move the position to appropriate edge.
if (direction == LogicalDirection.Backward)
{
position.MoveToPosition(textSegments[0].Start);
MoveToInsertionPosition(position, LogicalDirection.Backward);
}
else
{
position.MoveToPosition(textSegments[textSegments.Count - 1].End);
MoveToInsertionPosition(position, LogicalDirection.Forward);
}
// Try to move the position to the next page.
ITextPointer positionTemp = position.CreatePointer();
if (!positionTemp.MoveToNextInsertionPosition(direction))
{
break;
}
else
{
// MoveToNextInsertionPosition may return 'true' and move the position
// in oposite direction.
if (direction == LogicalDirection.Forward)
{
if (positionTemp.CompareTo(position) <= 0)
{
break;
}
}
else
{
if (positionTemp.CompareTo(position) >= 0)
{
break;
}
}
}
// Get embedded page ITextView for given position.
if (!textView.Contains(positionTemp))
{
break;
}
pageTextView = ((MultiPageTextView)textView).GetPageTextViewFromPosition(positionTemp);
textSegments = pageTextView.TextSegments;
moved++;
}
}
}
break;
case TextUnit.Document:
// This method assumes that position is already snapped to appropriate TextUnit.
break;
}
return (direction == LogicalDirection.Forward) ? moved : -moved;
}
/// <summary>
/// Moves the range the specified number of units in the text. Note that the text is not altered. Instead the
/// range spans a different part of the text.
/// If the range is degenerate, this method tries to move the insertion point count units. If the range is nondegenerate
/// and count is greater than zero, this method collapses the range at its end point, moves the resulting range forward
/// to a unit boundary (if it is not already at one), and then tries to move count - 1 units forward. If the range is
/// nondegenerate and count is less than zero, this method collapses the range at the starting point, moves the resulting
/// range backward to a unit boundary (if it isn't already at one), and then tries to move |count| - 1 units backward.
/// Thus, in both cases, collapsing a nondegenerate range, whether or not moving to the start or end of the unit following
/// the collapse, counts as a unit.
/// </summary>
/// <param name="unit">The textual unit for moving.</param>
/// <param name="count">The number of units to move. A positive count moves the range forward.
/// A negative count moves backward. A count of 0 has no effect.</param>
/// <returns>The number of units actually moved, which can be less than the number requested if
/// moving the range runs into the beginning or end of the document.</returns>
int ITextRangeProvider.Move(TextUnit unit, int count)
{
Normalize();
int movedCount = 0;
// Do not expand range for Paragraphs, because TextRange.SelectParagraph will take care of it.
if (unit != TextUnit.Paragraph)
{
ExpandToEnclosingUnit(unit, true, true);
}
if (count != 0)
{
// Move start position by number of units.
ITextPointer position = _start.CreatePointer();
movedCount = MovePositionByUnits(position, unit, count);
// If endpoint has been moved at least by one unit or its direction has changed, snap it to TextUnit boundary,
// because movement done by MovePositionByUnits does not guarantee position snapping.
if ((position.CompareTo(_start)==0 && position.LogicalDirection != _start.LogicalDirection) ||
(count > 0 && position.CompareTo(_start) > 0) ||
(count < 0 && position.CompareTo(_start) < 0))
{
_start = position;
// Move end position by 1 offset forward, so it does not point to _start.
// Later ExpandToEnclosingUnit will position it at appropriate unit boundary.
_end = position.CreatePointer();
if (unit != TextUnit.Page)
{
_end.MoveToNextInsertionPosition(LogicalDirection.Forward);
}
ExpandToEnclosingUnit(unit, true, true);
// If endpoint has been moved, but 'movedCount' is 0, it means that we snapped to neariest
// unit boundary. Treat this situation as actual move.
if (movedCount == 0)
{
movedCount = (count > 0) ? 1 : -1;
}
}
}
return movedCount;
}
/// <summary>
/// Helper function to move given position to word boundary. TextPointerBase.MoveToNextWordBoundary
/// cannot be used directly, because it does not modify LogicalDirection. Because of that, IsAtWordBoundary
/// for just moved positions may return FALSE.
/// </summary>
private static bool MoveToNextWordBoundary(ITextPointer position, LogicalDirection direction)
{
int moveCounter = 0;
ITextPointer startPosition = position.CreatePointer();
// Move the position in the given direction until word boundary is reached.
while (position.MoveToNextInsertionPosition(direction))
{
moveCounter++;
if (IsAtWordBoundary(position))
{
break;
}
// Need to break the loop for weird case when there is no word break in text content.
// When the word looks too long, consider end of textRun as a word break.
if (moveCounter > 128) // 128 was taken as a random number. Probably not big enough though...
{
position.MoveToPosition(startPosition);
position.MoveToNextContextPosition(direction);
break;
}
}
// Note that we always use Forward direction for word orientation.
if (moveCounter > 0)
{
position.SetLogicalDirection(LogicalDirection.Forward);
}
return moveCounter > 0;
}
