public static void SetTextDecorationOnSelection(TextRange range, TextDecorationLocation decorationLocation, TextDecorationCollection newTextDecorations, bool value)
{
TextDecorationCollection decorations = new TextDecorationCollection();
if (range.GetPropertyValue(TextBlock.TextDecorationsProperty) != DependencyProperty.UnsetValue)
{
TextDecorationCollection oldDecorations = (TextDecorationCollection)range.GetPropertyValue(TextBlock.TextDecorationsProperty);
if (oldDecorations != null)
{
decorations.Add(oldDecorations);
}
}
if (value == true)
{
bool underlineAlreadyFound = false;
foreach (TextDecoration decoration in decorations)
{
if (decoration.Location == decorationLocation)
{
underlineAlreadyFound = true;
break;
}
}
if (!underlineAlreadyFound)
{
decorations.Add(newTextDecorations);
range.ApplyPropertyValue(TextBlock.TextDecorationsProperty, decorations);
}
}
else
{
for (int i = 0; i < decorations.Count; i++)
{
if (decorations[i].Location == decorationLocation)
{
decorations.RemoveAt(i);
break;
}
}
range.ApplyPropertyValue(TextBlock.TextDecorationsProperty, decorations);
}
}