/// <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: 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);
}
