''' <summary>
''' Stores current action description of level 1.
''' </summary>
Shared _currentActionDescriptionLevel1 As String = Nothing

''' <summary>
''' Stores current action description of level 2.
''' </summary>
Shared _currentActionDescriptionLevel2 As String = Nothing

''' <summary>
''' Stores current action description of level 3.
''' </summary>
Shared _currentActionDescriptionLevel3 As String = Nothing

''' <summary>
''' Obfuscates encoding of all fonts of PDF document.
''' </summary>
''' <param name="pdfFilename">The filename of PDF document.</param>
''' <param name="resultFilename">The filename of resulting PDF document.</param>
Public Shared Sub ObfuscateEncodingOfAllFontsWithDetailedInfo(pdfFilename As String, resultFilename As String)
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename)
        ' create obfuscator
        Dim textEncodingObfuscator As New Vintasoft.Imaging.Pdf.PdfTextEncodingObfuscator()
        Try
            ' create progress handler which handles 3 levels of progress
            Dim actionProgressHandler As Vintasoft.Imaging.Utils.IActionProgressHandler = Vintasoft.Imaging.Utils.ActionProgressHandlers.CreateActionProgressHandler(AddressOf OnObfuscateProgressLevel1, AddressOf OnObfuscateProgressLevel2, AddressOf OnObfuscateProgressLevel3)
            ' create progress controller
            Dim progressController As New Vintasoft.Imaging.Utils.ActionProgressController(actionProgressHandler)
            ' obfuscate all fonts
            textEncodingObfuscator.Obfuscate(document, progressController)
            ' pack and save document to new location
            document.Pack(resultFilename)
        Catch ex As System.Exception
            System.Console.WriteLine(ex.Message)
        End Try
    End Using
End Sub

''' <summary>
''' Outputs description of level 1 actions of font obfuscation.
''' </summary>
Private Shared Sub OnObfuscateProgressLevel1(sender As Object, e As Vintasoft.Imaging.ProgressEventArgs)
    Dim actionDescription As String = e.Description
    ' if action is finished
    If e.Progress = 100 Then
        ' output action description with small indent
        System.Console.WriteLine("  Finished ({0}).", actionDescription)
    ' if action is started
    ElseIf actionDescription <> _currentActionDescriptionLevel1 Then
        ' remember action description
        _currentActionDescriptionLevel1 = actionDescription
        ' output action description with small indent
        System.Console.WriteLine("{0}...", actionDescription)
    End If
End Sub

''' <summary>
''' Outputs description of level 2 actions of font obfuscation.
''' </summary>
Private Shared Sub OnObfuscateProgressLevel2(sender As Object, e As Vintasoft.Imaging.ProgressEventArgs)
    Dim actionDescription As String = e.Description
    ' if action is finished
    If e.Progress = 100 Then
        ' output action description with medium indent
        System.Console.WriteLine("    Finished ({0}).", actionDescription)
    ' if action is started
    ElseIf actionDescription <> _currentActionDescriptionLevel2 Then
        ' remember action description
        _currentActionDescriptionLevel2 = actionDescription
        ' output action description with medium indent
        System.Console.WriteLine("  {0}...", actionDescription)
    End If
End Sub

''' <summary>
''' Outputs description of level 3 actions of font obfuscation.
''' </summary>
Private Shared Sub OnObfuscateProgressLevel3(sender As Object, e As Vintasoft.Imaging.ProgressEventArgs)
    Dim actionDescription As String = e.Description
    ' if action is finished
    If e.Progress = 100 Then
        ' output action description with large indent
        System.Console.WriteLine("        Finished ({0}).", actionDescription)
    ' if action is started
    ElseIf actionDescription <> _currentActionDescriptionLevel3 Then
        ' remember action description
        _currentActionDescriptionLevel3 = actionDescription
        ' output action description with large indent
        System.Console.WriteLine("      {0}...", actionDescription)
    End If
End Sub

/// <summary>
/// Stores current action description of level 1.
/// </summary>
static string _currentActionDescriptionLevel1 = null;

/// <summary>
/// Stores current action description of level 2.
/// </summary>
static string _currentActionDescriptionLevel2 = null;

/// <summary>
/// Stores current action description of level 3.
/// </summary>
static string _currentActionDescriptionLevel3 = null;

/// <summary>
/// Obfuscates encoding of all fonts of PDF document.
/// </summary>
/// <param name="pdfFilename">The filename of PDF document.</param>
/// <param name="resultFilename">The filename of resulting PDF document.</param>
public static void ObfuscateEncodingOfAllFontsWithDetailedInfo(
    string pdfFilename,
    string resultFilename)
{
    using (Vintasoft.Imaging.Pdf.PdfDocument document = new Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename))
    {
        // create obfuscator
        Vintasoft.Imaging.Pdf.PdfTextEncodingObfuscator textEncodingObfuscator = 
            new Vintasoft.Imaging.Pdf.PdfTextEncodingObfuscator();
        try
        {
            // create progress handler which handles 3 levels of progress
            Vintasoft.Imaging.Utils.IActionProgressHandler actionProgressHandler = 
                Vintasoft.Imaging.Utils.ActionProgressHandlers.CreateActionProgressHandler(
                    OnObfuscateProgressLevel1, OnObfuscateProgressLevel2, OnObfuscateProgressLevel3);
            // create progress controller
            Vintasoft.Imaging.Utils.ActionProgressController progressController = 
                new Vintasoft.Imaging.Utils.ActionProgressController(actionProgressHandler);
            // obfuscate all fonts
            textEncodingObfuscator.Obfuscate(document, progressController);
            // pack and save document to new location
            document.Pack(resultFilename);
        }
        catch (System.Exception ex)
        {
            System.Console.WriteLine(ex.Message);
        }
    }
}

/// <summary>
/// Outputs description of level 1 actions of font obfuscation.
/// </summary>
private static void OnObfuscateProgressLevel1(object sender, Vintasoft.Imaging.ProgressEventArgs e)
{
    string actionDescription = e.Description;
    // if action is finished
    if (e.Progress == 100)
    {
        // output action description with small indent
        System.Console.WriteLine("  Finished ({0}).", actionDescription);
    }
    // if action is started
    else if (actionDescription != _currentActionDescriptionLevel1)
    {
        // remember action description
        _currentActionDescriptionLevel1 = actionDescription;
        // output action description with small indent
        System.Console.WriteLine("{0}...", actionDescription);
    }
}

/// <summary>
/// Outputs description of level 2 actions of font obfuscation.
/// </summary>
private static void OnObfuscateProgressLevel2(object sender, Vintasoft.Imaging.ProgressEventArgs e)
{
    string actionDescription = e.Description;
    // if action is finished
    if (e.Progress == 100)
    {
        // output action description with medium indent
        System.Console.WriteLine("    Finished ({0}).", actionDescription);
    }
    // if action is started
    else if (actionDescription != _currentActionDescriptionLevel2)
    {
        // remember action description
        _currentActionDescriptionLevel2 = actionDescription;
        // output action description with medium indent
        System.Console.WriteLine("  {0}...", actionDescription);
    }
}

/// <summary>
/// Outputs description of level 3 actions of font obfuscation.
/// </summary>
private static void OnObfuscateProgressLevel3(object sender, Vintasoft.Imaging.ProgressEventArgs e)
{
    string actionDescription = e.Description;
    // if action is finished
    if (e.Progress == 100)
    {
        // output action description with large indent
        System.Console.WriteLine("        Finished ({0}).", actionDescription);
    }
    // if action is started
    else if (actionDescription != _currentActionDescriptionLevel3)
    {
        // remember action description
        _currentActionDescriptionLevel3 = actionDescription;
        // output action description with large indent
        System.Console.WriteLine("      {0}...", actionDescription);
    }
}