public static IText GetTextAtLocation(this ISegment segment, int startIndex)
{
var counter = segment.GetCharacterCountingIterator(startIndex);
if (counter.CharacterCount < startIndex)
{
// the actual count is between this location and the next
// - if this is a text node we can point to the exact location inside the text
IText text = counter.CurrentLocation.ItemAtLocation as IText;
return(text);
}
return(null);
}
public static void Replace(this ISegment segment, int startIndex, int endPosition, string replacementText)
{
var counter = segment.GetCharacterCountingIterator(startIndex);
if (counter.CharacterCount < startIndex)
{
// the actual count is between this location and the next
// - if this is a text node we can point to the exact location inside the text
IText text = counter.CurrentLocation.ItemAtLocation as IText;
if (text != null)
{
var startLocationInsideTextItem = new TextLocation(counter.CurrentLocation, startIndex - counter.CharacterCount);
var sb = new StringBuilder(text.Properties.Text);
sb.Remove(startIndex, endPosition - startIndex);
sb.Insert(startIndex, replacementText);
text.Properties.Text = sb.ToString();
}
}
}
public static string Substring(this ISegment segment, int startIndex, int endPosition)
{
var counter = segment.GetCharacterCountingIterator(startIndex);
if (counter.CharacterCount < startIndex)
{
// the actual count is between this location and the next
// - if this is a text node we can point to the exact location inside the text
IText text = counter.CurrentLocation.ItemAtLocation as IText;
if (text != null)
{
var startLocationInsideTextItem = new TextLocation(counter.CurrentLocation, startIndex - counter.CharacterCount);
var segmentText = text.Properties.Text;
return(segmentText.Substring(startLocationInsideTextItem.TextOffset,
endPosition - startLocationInsideTextItem.TextOffset));
}
}
return(string.Empty);
}
