// The project, which uses this code, must have references to the following assemblies:
// - Vintasoft.Imaging
// - Vintasoft.Imaging.Pdf
// - Vintasoft.Imaging.Pdf.JavaScript
// - Vintasoft.Imaging.Pdf.Wpf.UI
// - Vintasoft.Imaging.Wpf.UI

/// <summary>
/// Creates the PDF annotation tool with JavaScript support.
/// </summary>
/// <param name="viewer">The image viewer.</param>
public static Vintasoft.Imaging.Pdf.Wpf.UI.Annotations.WpfPdfAnnotationTool CreatePdfAnnotationToolWithJavaScriptSupport(
    Vintasoft.Imaging.Wpf.UI.WpfImageViewer viewer)
{
    // create PDF JavaScript application
    Vintasoft.Imaging.Pdf.Wpf.UI.JavaScript.WpfPdfJsApp jsApp = 
        new Vintasoft.Imaging.Pdf.Wpf.UI.JavaScript.WpfPdfJsApp();
    // add PDF documents, which are associated with images in viewer,
    // to the document set of PDF JavaScript application
    jsApp.RegisterImageViewer(viewer);
    // create PdfJavaScriptActionExecutor for PDF JavaScript application
    jsApp.ActionExecutor = new Vintasoft.Imaging.Pdf.JavaScript.PdfJavaScriptActionExecutor(
        jsApp, new Vintasoft.Imaging.Pdf.JavaScriptApi.PdfJsConsole());

    // create PdfAnnotationTool
    Vintasoft.Imaging.Pdf.Wpf.UI.Annotations.WpfPdfAnnotationTool annotationTool = 
        new Vintasoft.Imaging.Pdf.Wpf.UI.Annotations.WpfPdfAnnotationTool(jsApp, true);
    annotationTool.InteractionMode = Vintasoft.Imaging.Pdf.Wpf.UI.Annotations.WpfPdfAnnotationInteractionMode.Markup;

    // create an application action executor
    Vintasoft.Imaging.Pdf.PdfActionCompositeExecutor applicationActionExecutor = 
        new Vintasoft.Imaging.Pdf.PdfActionCompositeExecutor();
    // add executor for PdfJavaScriptAction to the application action executor
    applicationActionExecutor.Items.Add(jsApp.ActionExecutor);
    // add executor for PdfGotoAction to the application action executor
    applicationActionExecutor.Items.Add(new Vintasoft.Imaging.Pdf.Wpf.UI.WpfPdfGotoActionExecutor(viewer));
    // add executor for PdfNamedAction to the application action executor
    applicationActionExecutor.Items.Add(new Vintasoft.Imaging.Pdf.Wpf.UI.WpfPdfNamedActionExecutor(viewer));
    // add executor for PdfResetFormAction to the application action executor
    applicationActionExecutor.Items.Add(
        new Vintasoft.Imaging.Pdf.Wpf.UI.Annotations.WpfPdfAnnotationToolResetFormActionExecutor(annotationTool));
    // add executor for PdfAnnotationHideAction to the application action executor
    applicationActionExecutor.Items.Add(
        new Vintasoft.Imaging.Pdf.Wpf.UI.Annotations.WpfPdfAnnotationToolAnnotationHideActionExecutor(annotationTool));
    // add executor for PdfUriAction to the application action executor,
    // executor is located in WpfPdfDemosCommonCode
    //applicationActionExecutor.Items.Add(new PdfUriActionExecutor());
    // add executor for PdfLaunchAction to the application action executor,
    // executor is located in WpfPdfDemosCommonCode
    //applicationActionExecutor.Items.Add(new PdfLaunchActionExecutor());
    // add executor for PdfSubmitFormAction to the application action executor,
    // executor is located in WpfPdfDemosCommonCode
    //applicationActionExecutor.Items.Add(new PdfSubmitActionExecutor(viewer));
    // add the default executor (for PdfResetFormAction and PdfAnnotationHideAction)
    // to the application action executor
    applicationActionExecutor.Items.Add(new Vintasoft.Imaging.Pdf.PdfActionExecutor());

    // set the application action executor as action executor of PDF annotation tool
    annotationTool.ActionExecutor = applicationActionExecutor;

    // create a document-level actions executor
    Vintasoft.Imaging.Pdf.PdfDocumentLevelActionsExecutor documentLevelActionsExecutor =
       new Vintasoft.Imaging.Pdf.PdfDocumentLevelActionsExecutor(jsApp);
    // set the application action executor as action executor of the document-level actions executor
    documentLevelActionsExecutor.ActionExecutor = applicationActionExecutor;

    return annotationTool;
}

// The project, which uses this code, must have references to the following assemblies:
// - Vintasoft.Imaging
// - Vintasoft.Imaging.Pdf
// - Vintasoft.Imaging.Pdf.Wpf.UI

/// <summary>
/// Adds and builds a button form field.
/// </summary>
/// <param name="annotationTool">The PDF annotation tool, which will build a field.</param>
public static void AddAndBuildButtonField(
    Vintasoft.Imaging.Pdf.Wpf.UI.Annotations.WpfPdfAnnotationTool annotationTool)
{
    Vintasoft.Imaging.Pdf.Tree.PdfPage focusedPage = annotationTool.FocusedPage;
    if (focusedPage == null)
        throw new System.InvalidOperationException();

    // create a Button form field
    Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormPushButtonField field = 
        new Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormPushButtonField(
            focusedPage.Document,
            GetFieldName(focusedPage.Document, null, "Button{0}"),
            new System.Drawing.RectangleF(0, 0, 150, 22));

    // set the field appearance generator
    Vintasoft.Imaging.Pdf.Tree.InteractiveForms.AppearanceGenerators.PdfButton3DBorderFieldAppearanceGenerator appearanceGenerator =
        new Vintasoft.Imaging.Pdf.Tree.InteractiveForms.AppearanceGenerators.PdfButton3DBorderFieldAppearanceGenerator();
    field.Annotation.AppearanceGenerator = appearanceGenerator;
    appearanceGenerator.NormalCaption = "JavaScript 'Hello!'";
    appearanceGenerator.FontSize = 14;

    // if tool mode does not allow to build annotation
    if (annotationTool.InteractionMode != Vintasoft.Imaging.Pdf.Wpf.UI.Annotations.WpfPdfAnnotationInteractionMode.Edit)
        // change the tool mode
        annotationTool.InteractionMode = Vintasoft.Imaging.Pdf.Wpf.UI.Annotations.WpfPdfAnnotationInteractionMode.Edit;

    // set JavaScript action to Activate trigger event
    field.Annotation.ActivateAction =
        new Vintasoft.Imaging.Pdf.Tree.PdfJavaScriptAction(focusedPage.Document, "app.alert('Hello!', 3);");

    // add and build annotation
    annotationTool.AddAndBuildFormField(field);
}

/// <summary>
/// Returns the name of new field.
/// </summary>
/// <param name="document">PDF document.</param>
/// <param name="parentField">The parent interactive form field.</param>
/// <param name="fieldNameFormat">The format of field name.</param>
/// <returns>The name of new field.</returns>
private static string GetFieldName(
    Vintasoft.Imaging.Pdf.PdfDocument document,
    Vintasoft.Imaging.Pdf.Tree.InteractiveForms.PdfInteractiveFormField parentField,
    string fieldNameFormat)
{
    string format = fieldNameFormat;
    if (parentField != null)
        format = string.Format("{0}.{1}", parentField.FullyQualifiedName, fieldNameFormat);
    if (document.InteractiveForm == null)
        return string.Format(fieldNameFormat, 1);
    int i = 1;
    while (document.InteractiveForm.FindField(string.Format(format, i)) != null)
        i++;
    return string.Format(fieldNameFormat, i);
}