Aspose.Words.Examples.CSharp.Loading_Saving.SectionSplitter.VisitParagraphStart C# (CSharp) Method

        public override VisitorAction VisitParagraphStart(Paragraph paragraph)
        {
            if (paragraph.IsListItem)
            {
                List paraList = paragraph.ListFormat.List;
                ListLevel currentLevel = paragraph.ListFormat.ListLevel;

                // Since we have encountered a list item we need to check if this will reset
                // Any subsequent list levels and if so then update the numbering of the level.
                int currentListLevelNumber = paragraph.ListFormat.ListLevelNumber;
                for (int i = currentListLevelNumber + 1; i < paraList.ListLevels.Count; i++)
                {
                    ListLevel paraLevel = paraList.ListLevels[i];

                    if (paraLevel.RestartAfterLevel >= currentListLevelNumber)
                    {
                        // This list level needs to be reset after the current list number.
                        mListLevelToListNumberLookup[paraLevel] = paraLevel.StartAt;
                    }
                }

                // A list which was used on a previous page is present on a different page, the list
                // Needs to be copied so list numbering is retained when extracting individual pages.
                if (ContainsListLevelAndPageChanged(paragraph))
                {
                    List copyList = paragraph.Document.Lists.AddCopy(paraList);
                    mListLevelToListNumberLookup[currentLevel] = paragraph.ListLabel.LabelValue;

                    // Set the numbering of each list level to start at the numbering of the level on the previous page.
                    for (int i = 0; i < paraList.ListLevels.Count; i++)
                    {
                        ListLevel paraLevel = paraList.ListLevels[i];

                        if (mListLevelToListNumberLookup.ContainsKey(paraLevel))
                            copyList.ListLevels[i].StartAt = (int)mListLevelToListNumberLookup[paraLevel];
                    }

                    mListToReplacementListLookup[paraList] = copyList;
                }

                if (mListToReplacementListLookup.ContainsKey(paraList))
                {
                    // This paragraph belongs to a list from a previous page. Apply the replacement list.
                    paragraph.ListFormat.List = (List)mListToReplacementListLookup[paraList];
                    // This is a trick to get the spacing of the list level to set correctly.
                    paragraph.ListFormat.ListLevelNumber += 0;
                }

                mListLevelToPageLookup[currentLevel] = mPageNumberFinder.GetPage(paragraph);
                mListLevelToListNumberLookup[currentLevel] = paragraph.ListLabel.LabelValue;
            }

            Section prevSection = (Section)paragraph.ParentSection.PreviousSibling;
            Paragraph prevBodyPara = paragraph.PreviousSibling as Paragraph;

            Paragraph prevSectionPara = prevSection != null && paragraph == paragraph.ParentSection.Body.FirstChild ? prevSection.Body.LastParagraph : null;
            Paragraph prevParagraph = prevBodyPara != null ? prevBodyPara : prevSectionPara;

            if (paragraph.IsEndOfSection && !paragraph.HasChildNodes)
                paragraph.Remove();

            // Paragraphs across pages can merge or remove spacing depending upon the previous paragraph.
            if (prevParagraph != null)
            {
                if (mPageNumberFinder.GetPage(paragraph) != mPageNumberFinder.GetPageEnd(prevParagraph))
                {
                    if (paragraph.IsListItem && prevParagraph.IsListItem && !prevParagraph.IsEndOfSection)
                        prevParagraph.ParagraphFormat.SpaceAfter = 0;
                    else if (prevParagraph.ParagraphFormat.StyleName == paragraph.ParagraphFormat.StyleName && paragraph.ParagraphFormat.NoSpaceBetweenParagraphsOfSameStyle)
                        paragraph.ParagraphFormat.SpaceBefore = 0;
                    else if (paragraph.ParagraphFormat.PageBreakBefore || (prevParagraph.IsEndOfSection && prevSection.PageSetup.SectionStart != SectionStart.NewColumn))
                        paragraph.ParagraphFormat.SpaceBefore = System.Math.Max(paragraph.ParagraphFormat.SpaceBefore - prevParagraph.ParagraphFormat.SpaceAfter, 0);
                    else
                        paragraph.ParagraphFormat.SpaceBefore = 0;
                }
            }

            return VisitorAction.Continue;
        }