Exemple #1
0
        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);
        }