VisitCellEnd

DocumentVisitor.VisitCellEnd method

Called when enumeration of a table cell has ended.

public virtual VisitorAction VisitCellEnd(Cell cell)
ParameterTypeDescription
cellCellThe object that is being visited.

Return Value

A VisitorAction value that specifies how to continue the enumeration.

Examples

Shows how to print the node structure of every table in a document.

public void TableToText()
{
    Document doc = new Document(MyDir + "DocumentVisitor-compatible features.docx");
    TableStructurePrinter visitor = new TableStructurePrinter();

    // When we get a composite node to accept a document visitor, the visitor visits the accepting node,
    // and then traverses all the node's children in a depth-first manner.
    // The visitor can read and modify each visited node.
    doc.Accept(visitor);

    Console.WriteLine(visitor.GetText());
}

/// <summary>
/// Traverses a node's non-binary tree of child nodes.
/// Creates a map in the form of a string of all encountered Table nodes and their children.
/// </summary>
public class TableStructurePrinter : DocumentVisitor
{
    public TableStructurePrinter()
    {
        mVisitedTables = new StringBuilder();
        mVisitorIsInsideTable = false;
    }

    public string GetText()
    {
        return mVisitedTables.ToString();
    }

    /// <summary>
    /// Called when a Run node is encountered in the document.
    /// Runs that are not within tables are not recorded.
    /// </summary>
    public override VisitorAction VisitRun(Run run)
    {
        if (mVisitorIsInsideTable) IndentAndAppendLine("[Run] \"" + run.GetText() + "\"");

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a Table is encountered in the document.
    /// </summary>
    public override VisitorAction VisitTableStart(Table table)
    {
        int rows = 0;
        int columns = 0;

        if (table.Rows.Count > 0)
        {
            rows = table.Rows.Count;
            columns = table.FirstRow.Count;
        }

        IndentAndAppendLine("[Table start] Size: " + rows + "x" + columns);
        mDocTraversalDepth++;
        mVisitorIsInsideTable = true;

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called after all the child nodes of a Table node have been visited.
    /// </summary>
    public override VisitorAction VisitTableEnd(Table table)
    {
        mDocTraversalDepth--;
        IndentAndAppendLine("[Table end]");
        mVisitorIsInsideTable = false;

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a Row node is encountered in the document.
    /// </summary>
    public override VisitorAction VisitRowStart(Row row)
    {
        string rowContents = row.GetText().TrimEnd(new []{ '\u0007', ' ' }).Replace("\u0007", ", ");
        int rowWidth = row.IndexOf(row.LastCell) + 1;
        int rowIndex = row.ParentTable.IndexOf(row);
        string rowStatusInTable = row.IsFirstRow && row.IsLastRow ? "only" : row.IsFirstRow ? "first" : row.IsLastRow ? "last" : "";
        if (rowStatusInTable != "")
        {
            rowStatusInTable = $", the {rowStatusInTable} row in this table,";
        }

        IndentAndAppendLine($"[Row start] Row #{++rowIndex}{rowStatusInTable} width {rowWidth}, \"{rowContents}\"");
        mDocTraversalDepth++;

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called after all the child nodes of a Row node have been visited.
    /// </summary>
    public override VisitorAction VisitRowEnd(Row row)
    {
        mDocTraversalDepth--;
        IndentAndAppendLine("[Row end]");

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a Cell node is encountered in the document.
    /// </summary>
    public override VisitorAction VisitCellStart(Cell cell)
    {
        Row row = cell.ParentRow;
        Table table = row.ParentTable;
        string cellStatusInRow = cell.IsFirstCell && cell.IsLastCell ? "only" : cell.IsFirstCell ? "first" : cell.IsLastCell ? "last" : "";
        if (cellStatusInRow != "")
        {
            cellStatusInRow = $", the {cellStatusInRow} cell in this row";
        }

        IndentAndAppendLine($"[Cell start] Row {table.IndexOf(row) + 1}, Col {row.IndexOf(cell) + 1}{cellStatusInRow}");
        mDocTraversalDepth++;

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called after all the child nodes of a Cell node have been visited.
    /// </summary>
    public override VisitorAction VisitCellEnd(Cell cell)
    {
        mDocTraversalDepth--;
        IndentAndAppendLine("[Cell end]");
        return VisitorAction.Continue;
    }

    /// <summary>
    /// Append a line to the StringBuilder, and indent it depending on how deep the visitor is
    /// into the current table's tree of child nodes.
    /// </summary>
    /// <param name="text"></param>
    private void IndentAndAppendLine(string text)
    {
        for (int i = 0; i < mDocTraversalDepth; i++)
        {
            mVisitedTables.Append("|  ");
        }

        mVisitedTables.AppendLine(text);
    }

    private bool mVisitorIsInsideTable;
    private int mDocTraversalDepth;
    private readonly StringBuilder mVisitedTables;
}

Shows how to use a DocumentVisitor implementation to remove all hidden content from a document.

public void RemoveHiddenContentFromDocument()
{
    Document doc = new Document(MyDir + "Hidden content.docx");
    RemoveHiddenContentVisitor hiddenContentRemover = new RemoveHiddenContentVisitor();

    // Below are three types of fields which can accept a document visitor,
    // which will allow it to visit the accepting node, and then traverse its child nodes in a depth-first manner.
    // 1 -  Paragraph node:
    Paragraph para = (Paragraph)doc.GetChild(NodeType.Paragraph, 4, true);
    para.Accept(hiddenContentRemover);

    // 2 -  Table node:
    Table table = doc.FirstSection.Body.Tables[0];
    table.Accept(hiddenContentRemover);

    // 3 -  Document node:
    doc.Accept(hiddenContentRemover);

    doc.Save(ArtifactsDir + "Font.RemoveHiddenContentFromDocument.docx");
}

/// <summary>
/// Removes all visited nodes marked as "hidden content".
/// </summary>
public class RemoveHiddenContentVisitor : DocumentVisitor
{
    /// <summary>
    /// Called when a FieldStart node is encountered in the document.
    /// </summary>
    public override VisitorAction VisitFieldStart(FieldStart fieldStart)
    {
        if (fieldStart.Font.Hidden)
            fieldStart.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a FieldEnd node is encountered in the document.
    /// </summary>
    public override VisitorAction VisitFieldEnd(FieldEnd fieldEnd)
    {
        if (fieldEnd.Font.Hidden)
            fieldEnd.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a FieldSeparator node is encountered in the document.
    /// </summary>
    public override VisitorAction VisitFieldSeparator(FieldSeparator fieldSeparator)
    {
        if (fieldSeparator.Font.Hidden)
            fieldSeparator.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a Run node is encountered in the document.
    /// </summary>
    public override VisitorAction VisitRun(Run run)
    {
        if (run.Font.Hidden)
            run.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a Paragraph node is encountered in the document.
    /// </summary>
    public override VisitorAction VisitParagraphStart(Paragraph paragraph)
    {
        if (paragraph.ParagraphBreakFont.Hidden)
            paragraph.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a FormField is encountered in the document.
    /// </summary>
    public override VisitorAction VisitFormField(FormField formField)
    {
        if (formField.Font.Hidden)
            formField.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a GroupShape is encountered in the document.
    /// </summary>
    public override VisitorAction VisitGroupShapeStart(GroupShape groupShape)
    {
        if (groupShape.Font.Hidden)
            groupShape.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a Shape is encountered in the document.
    /// </summary>
    public override VisitorAction VisitShapeStart(Shape shape)
    {
        if (shape.Font.Hidden)
            shape.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a Comment is encountered in the document.
    /// </summary>
    public override VisitorAction VisitCommentStart(Comment comment)
    {
        if (comment.Font.Hidden)
            comment.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a Footnote is encountered in the document.
    /// </summary>
    public override VisitorAction VisitFootnoteStart(Footnote footnote)
    {
        if (footnote.Font.Hidden)
            footnote.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when a SpecialCharacter is encountered in the document.
    /// </summary>
    public override VisitorAction VisitSpecialChar(SpecialChar specialChar)
    {
        Console.WriteLine(specialChar.GetText());

        if (specialChar.Font.Hidden)
            specialChar.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when visiting of a Table node is ended in the document.
    /// </summary>
    public override VisitorAction VisitTableEnd(Table table)
    {
        // The content inside table cells may have the hidden content flag, but the tables themselves cannot.
        // If this table had nothing but hidden content, this visitor would have removed all of it,
        // and there would be no child nodes left.
        // Thus, we can also treat the table itself as hidden content and remove it.
        // Tables which are empty but do not have hidden content will have cells with empty paragraphs inside,
        // which this visitor will not remove.
        if (!table.HasChildNodes)
            table.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when visiting of a Cell node is ended in the document.
    /// </summary>
    public override VisitorAction VisitCellEnd(Cell cell)
    {
        if (!cell.HasChildNodes && cell.ParentNode != null)
            cell.Remove();

        return VisitorAction.Continue;
    }

    /// <summary>
    /// Called when visiting of a Row node is ended in the document.
    /// </summary>
    public override VisitorAction VisitRowEnd(Row row)
    {
        if (!row.HasChildNodes && row.ParentNode != null)
            row.Remove();

        return VisitorAction.Continue;
    }
}

See Also

DocumentVisitor.VisitBuildingBlockStart DocumentVisitor.VisitCellStart