private static void RemoveHyperlink(AutoCompleteRichTextBox myRichTextBox, TextPointer caretPosition)
{
var backspacePosition = caretPosition.GetNextInsertionPosition(LogicalDirection.Backward);
Hyperlink hyperlink;
if (backspacePosition == null || !DocumentUtils.IsHyperlinkBoundaryCrossed(caretPosition, backspacePosition, out hyperlink))
{
return;
}
// Remember caretPosition with forward gravity. This is necessary since we are going to delete
// the hyperlink element preceeding caretPosition and after deletion current caretPosition
// (with backward gravity) will follow content preceeding the hyperlink.
// We want to remember content following the hyperlink to set new caret position at.
var newCaretPosition = caretPosition.GetPositionAtOffset(0, LogicalDirection.Forward);
// Deleting the hyperlink is done using logic below.
// 1. Copy its children Inline to a temporary array.
var hyperlinkChildren = hyperlink.Inlines;
var inlines = new Inline[hyperlinkChildren.Count];
hyperlinkChildren.CopyTo(inlines, 0);
// 2. Remove each child from parent hyperlink element and insert it after the hyperlink.
for (int i = inlines.Length - 1; i >= 0; i--)
{
hyperlinkChildren.Remove(inlines[i]);
hyperlink.SiblingInlines.InsertAfter(hyperlink, inlines[i]);
}
// 3. Apply hyperlink's local formatting properties to inlines (which are now outside hyperlink scope).
var localProperties = hyperlink.GetLocalValueEnumerator();
var inlineRange = new TextRange(inlines[0].ContentStart, inlines[inlines.Length - 1].ContentEnd);
while (localProperties.MoveNext())
{
var property = localProperties.Current;
var dp = property.Property;
object value = property.Value;
if (!dp.ReadOnly &&
dp != Inline.TextDecorationsProperty && // Ignore hyperlink defaults.
dp != TextElement.ForegroundProperty &&
dp != BaseUriHelper.BaseUriProperty &&
!DocumentUtils.IsHyperlinkProperty(dp))
{
inlineRange.ApplyPropertyValue(dp, value);
}
}
// 4. Delete the (empty) hyperlink element.
hyperlink.SiblingInlines.Remove(hyperlink);
// 5. Update selection, since we deleted Hyperlink element and caretPosition was at that Hyperlink's end boundary.
myRichTextBox.Selection.Select(newCaretPosition, newCaretPosition);
}
private void OnTextChanged(object sender, TextChangedEventArgs e)
{
if (!myWordsAddedFlag || Document == null)
{
return;
}
// Temporarily disable TextChanged event handler, since following code might insert Hyperlinks,
// which will raise another TextChanged event.
TextChanged -= OnTextChanged;
var navigator = mySelectionStartPosition;
while (navigator != null && navigator.CompareTo(mySelectionEndPosition) <= 0)
{
var wordRange = DocumentUtils.GetWordRange(navigator);
if (wordRange == null || wordRange.IsEmpty)
{
// No more words in the document.
break;
}
string wordText = wordRange.Text;
if (IsHyperlink(wordText) &&
!DocumentUtils.IsInHyperlinkScope(wordRange.Start) &&
!DocumentUtils.IsInHyperlinkScope(wordRange.End))
{
var hyperlink = new Hyperlink(wordRange.Start, wordRange.End);
hyperlink.NavigateUri = new Uri(wordText.StartsWith("http", StringComparison.OrdinalIgnoreCase) ? wordText : "http://" + wordText);
WeakEventManager <Hyperlink, RequestNavigateEventArgs> .AddHandler(hyperlink, "RequestNavigate", OnHyperlinkRequestNavigate);
navigator = hyperlink.ElementEnd.GetNextInsertionPosition(LogicalDirection.Forward);
}
else
{
navigator = wordRange.End.GetNextInsertionPosition(LogicalDirection.Forward);
}
}
TextChanged += OnTextChanged;
myWordsAddedFlag = false;
mySelectionStartPosition = null;
mySelectionEndPosition = null;
}