private bool _penalizedAsJustified; // flag indicating whether the paragraph should be penalized as fully-justified one
/// <summary>
/// Construct a paragraph cache to be used during optimal paragraph formatting
/// </summary>
internal TextParagraphCache(
FormatSettings settings,
int firstCharIndex,
int paragraphWidth
)
{
Invariant.Assert(settings != null);
// create full text
_finiteFormatWidth = settings.GetFiniteFormatWidth(paragraphWidth);
_fullText = FullTextState.Create(settings, firstCharIndex, _finiteFormatWidth);
// acquiring LS context
TextFormatterContext context = settings.Formatter.AcquireContext(_fullText, IntPtr.Zero);
_fullText.SetTabs(context);
IntPtr ploparabreakValue = IntPtr.Zero;
LsErr lserr = context.CreateParaBreakingSession(
firstCharIndex,
_finiteFormatWidth,
// breakrec is not needed before the first cp of para cache
// since we handle Bidi break ourselves.
IntPtr.Zero,
ref ploparabreakValue,
ref _penalizedAsJustified
);
// get the exception in context before it is released
Exception callbackException = context.CallbackException;
// release the context
context.Release();
if (lserr != LsErr.None)
{
GC.SuppressFinalize(this);
if (callbackException != null)
{
// rethrow exception thrown in callbacks
throw new InvalidOperationException(SR.Get(SRID.CreateParaBreakingSessionFailure, lserr), callbackException);
}
else
{
// throw with LS error codes
TextFormatterContext.ThrowExceptionFromLsError(SR.Get(SRID.CreateParaBreakingSessionFailure, lserr), lserr);
}
}
_ploparabreak.Value = ploparabreakValue;
// keep context alive till here
GC.KeepAlive(context);
}