public TextPointer Replace(TextRange range, EmojiElement emoji)
{
var run = range.Start.Parent as Run;
if (run == null)
{
return(range.End);
}
var before = new TextRange(run.ContentStart, range.Start).Text;
var after = new TextRange(range.End, run.ContentEnd).Text;
var inlines = run.SiblingInlines;
/* Insert new inlines in reverse order after the run */
if (!string.IsNullOrEmpty(after))
{
inlines.InsertAfter(run, new Run(after));
}
inlines.InsertAfter(run, emoji);
if (!string.IsNullOrEmpty(before))
{
inlines.InsertAfter(run, new Run(before));
}
TextPointer ret = emoji.ContentEnd; // FIXME
inlines.Remove(run);
return(ret);
}
private void FixEmojis()
{
if (m_pending_change)
{
return;
}
/* This will prevent our operation from polluting the undo buffer, but it
* will create an infinite undo stack... need to fix this. */
BeginChange();
m_pending_change = true;
TextPointer cur = Document.ContentStart;
while (cur.CompareTo(Document.ContentEnd) < 0)
{
TextPointer next = cur.GetNextInsertionPosition(LogicalDirection.Forward);
if (next == null)
{
break;
}
TextRange word = new TextRange(cur, next);
var emoji = EmojiElement.MakeFromString(word.Text);
if (emoji != null)
{
// Test this so as to preserve caret position
bool caret_was_next = (0 == next.CompareTo(CaretPosition));
next = Replace(word, emoji);
if (caret_was_next)
{
CaretPosition = next;
}
}
cur = next;
}
EndChange();
m_pending_change = false;
}