pdfPageTree.cs :  » PDF » SharpPDF » sharpPDF » C# / CSharp Open Source

using System;
using System.Text;
using System.Collections;

using sharpPDF.Exceptions;
using sharpPDF.Enumerators;

namespace sharpPDF{
  /// <summary>
  /// A Class that implements a PDF pageTree.
  /// </summary>
  internal class pdfPageTree : IWritable
  {
  
    private ArrayList _pages;
    private int _pageCount;
    private int _objectID;

    /// <summary>
    /// Pagetree's ID
    /// </summary>
    public int objectID
    {
    
      get
      {
        return _objectID;
      }

      set
      {
        _objectID = value;
      }

    }

    /// <summary>
    /// Class's constructor
    /// </summary>
    public pdfPageTree()
    {
      _pageCount = 0;
      _pages = new ArrayList();
    }

    /// <summary>
    /// Method that adds a page to the pageTree object
    /// </summary>
    /// <param name="pageID"></param>
    public void addPage(int pageID)
    {
      _pages.Add(pageID);
      _pageCount++;
    }

    /// <summary>
    /// Method that returns the PDF codes to write the pageTree in the document
    /// </summary>
    /// <returns>String that contains PDF codes</returns>
    public string getText()
    {
      if (_pages.Count > 0)
      {
        StringBuilder content = new StringBuilder();        
        content.Append(_objectID.ToString() + " 0 obj" + Convert.ToChar(13) + Convert.ToChar(10));
                content.Append("<<" + Convert.ToChar(13) + Convert.ToChar(10));
                content.Append("/Type /Pages" + Convert.ToChar(13) + Convert.ToChar(10));
                content.Append("/Count " + _pages.Count.ToString() + Convert.ToChar(13) + Convert.ToChar(10));
        content.Append("/Kids [");
        foreach( int item in _pages)
        {
          content.Append(item.ToString() + " 0 R ");
        }
        content.Append("]" + Convert.ToChar(13) + Convert.ToChar(10));
                content.Append(">>"  + Convert.ToChar(13) + Convert.ToChar(10));                
                content.Append("endobj" + Convert.ToChar(13) + Convert.ToChar(10));
                return content.ToString();                
      } else {
        return null;
      }  
  }

  }
}