/// <summary>
/// Sets or changes the number substitution behavior for a range of text.
/// </summary>
/// <param name="numberSubstitution">Number substitution behavior to apply to the text; can be null,
/// in which case the default number substitution method for the text culture is used.</param>
/// <param name="startIndex">The start index of initial character to apply the change to.</param>
/// <param name="count">The number of characters the change should be applied to.</param>
public void SetNumberSubstitution(
NumberSubstitution numberSubstitution,
int startIndex,
int count
)
{
int limit = ValidateRange(startIndex, count);
for (int i = startIndex; i < limit; )
{
SpanRider formatRider = new SpanRider(_formatRuns, _latestPosition, i);
i = Math.Min(limit, i + formatRider.Length);
#pragma warning disable 6506
// Presharp warns that runProps is not validated, but it can never be null
// because the rider is already checked to be in range
GenericTextRunProperties runProps = formatRider.CurrentElement as GenericTextRunProperties;
Invariant.Assert(runProps != null);
if (numberSubstitution != null)
{
if (numberSubstitution.Equals(runProps.NumberSubstitution))
continue;
}
else
{
if (runProps.NumberSubstitution == null)
continue;
}
GenericTextRunProperties newProps = new GenericTextRunProperties(
runProps.Typeface,
runProps.FontRenderingEmSize,
runProps.FontHintingEmSize,
runProps.TextDecorations,
runProps.ForegroundBrush,
runProps.BackgroundBrush,
runProps.BaselineAlignment,
runProps.CultureInfo,
numberSubstitution
);
#pragma warning restore 6506
_latestPosition = _formatRuns.SetValue(formatRider.CurrentPosition, i - formatRider.CurrentPosition, newProps, formatRider.SpanPosition);
InvalidateMetrics();
}
}
static bool Equals(NumberSubstitution a, NumberSubstitution b) {
if (a == b)
return true;
if (a == null || b == null)
return false;
return a.Equals(b);
}
