private void RemoveHyperlinkFormat()
{
TextPointer caretPosition = Selection.Start;
TextPointer backspacePosition = caretPosition.GetNextInsertionPosition(LogicalDirection.Backward);
Hyperlink hyperlink = default(Hyperlink);
try
{
if (backspacePosition != null && IsHyperlinkBoundaryCrossed(caretPosition, backspacePosition, ref hyperlink))
{
// Remember caretPosition with forward gravity. This is necessary since we are going to delete
// the hyperlink element preceding caretPosition and after deletion current caretPosition
// (with backward gravity) will follow content preceding the hyperlink.
// We want to remember content following the hyperlink to set new caret position at.
TextPointer newCaretPosition = caretPosition.GetPositionAtOffset(0, LogicalDirection.Forward);
// 1. Copy its children Inline to a temporary array
InlineCollection hyperlinkChildren = hyperlink.Inlines;
Inline[] 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]);
if (hyperlink.SiblingInlines != null)
{
hyperlink.SiblingInlines.InsertAfter(hyperlink, inlines[i]);
}
}
// 3. Apply hyperlink local formatting properties to inlines (which are now outside hyperlink scope)
LocalValueEnumerator localProperties = hyperlink.GetLocalValueEnumerator();
TextRange inlineRange = new TextRange(inlines[0].ContentStart, inlines[inlines.Length - 1].ContentEnd);
while (localProperties.MoveNext())
{
LocalValueEntry property = localProperties.Current;
DependencyProperty dependencyProperty = property.Property;
object value = property.Value;
// Ignore hyperlink defaults
if (dependencyProperty.ReadOnly == false &&
dependencyProperty.Equals(Inline.TextDecorationsProperty) == false &&
dependencyProperty.Equals(TextElement.ForegroundProperty) == false &&
dependencyProperty.Equals(BaseUriHelper.BaseUriProperty) == false &&
IsHyperlinkProperty(dependencyProperty) == false &&
dependencyProperty.Name.Equals("IsEnabled") == false)
{
inlineRange.ApplyPropertyValue(dependencyProperty, value);
}
}
// 4. Delete the (empty) hyperlink element
if (hyperlink.SiblingInlines != null)
{
hyperlink.RequestNavigate -= OnRequestNavigate;
hyperlink.SiblingInlines.Remove(hyperlink);
}
// 5. Update selection, since we deleted Hyperlink element and caretPosition was at that hyperlink's end boundary
Selection.Select(newCaretPosition, newCaretPosition);
}
}
catch (Exception ex)
{
Log.Error("Error while removing hyperlink format: {EX}", ex);
}
}