//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.Drawing;using System.IO;using System.Xml;using System.Text;using System.Collections.Generic;using GrapeCity.Documents.Pdf;using GrapeCity.Documents.Pdf.AcroForms;using GrapeCity.Documents.Pdf.Actions;using GrapeCity.Documents.Pdf.Annotations;using GrapeCity.Documents.Text;
namespace DsPdfWeb.Demos{    // Note that the FormDataSubmit sample shows a better and easier solution for submitting form data.    //    // This sample creates an AcroForm PDF that can be submitted to the server.    // It relies on the server to put the submitted data into an XML,    // import that XML into a PDF containing a similar form,    // and send the form with loaded data back to the client.    // Note that the produced PDF with filled form fields    // is shown in the client browser's default PDF viewer.    // The code is similar to FormSubmit.    public class FormSubmitXml    {        public int CreatePDF(Stream stream)        {            var doc = new GcPdfDocument();            var page = doc.NewPage();
            var rc = Common.Util.AddNote("Fill the fields in the form and click 'Submit' to send it back to the server. " +                "The sample server will put the submitted data into an XML, feed that XML" +                "to a PDF with a different but compatible form, and send the resulting form" +                "filled with the submitted data back to your browser." +                "Note that the form with the submitted data is opened in the browser's default PDF viewer," +                "and does not have the 'Submit' and 'Reset' buttons.", page);
            var g = page.Graphics;            var tf = new TextFormat() { Font = StandardFonts.Times, FontSize = 14 };            var ip = new PointF(72, rc.Bottom + 36);            float fldOffset = 72 * 2 + 46;            float fldHeight = tf.FontSize * 1.2f;            float dY = 32;
            // Text field:            g.DrawString("First name:", tf, ip);            var fldFirstName = new TextField() { Name = "FirstName", Value = "John" };            fldFirstName.Widget.Page = page;            fldFirstName.Widget.Rect = new RectangleF(ip.X + fldOffset, ip.Y, 72 * 3, fldHeight);            fldFirstName.Widget.DefaultAppearance.Font = tf.Font;            fldFirstName.Widget.DefaultAppearance.FontSize = tf.FontSize;            doc.AcroForm.Fields.Add(fldFirstName);            ip.Y += dY;
            // Text field:            g.DrawString("Last name:", tf, ip);            var fldLastName = new TextField() { Name = "LastName", Value = "Smith" };            fldLastName.Widget.Page = page;            fldLastName.Widget.Rect = new RectangleF(ip.X + fldOffset, ip.Y, 72 * 3, fldHeight);            fldLastName.Widget.DefaultAppearance.Font = tf.Font;            fldLastName.Widget.DefaultAppearance.FontSize = tf.FontSize;            doc.AcroForm.Fields.Add(fldLastName);            ip.Y += dY;
            // Checkbox:            g.DrawString("Subscribe to Mailing List:", tf, ip);            var fldCheckbox = new CheckBoxField() { Name = "Subscribe", Checked = true };            fldCheckbox.Widget.Page = page;            fldCheckbox.Widget.Rect = new RectangleF(ip.X + fldOffset, ip.Y, fldHeight, fldHeight);            doc.AcroForm.Fields.Add(fldCheckbox);            ip.Y += dY;
            // Multiline TextBox:            g.DrawString("Additional information:", tf, ip);            var fldAdditionalInfo = new TextField() { Name = "AdditionalInfo", Multiline = true };            fldAdditionalInfo.Widget.Page = page;            fldAdditionalInfo.Widget.Rect = new RectangleF(ip.X + fldOffset, ip.Y, 72 * 3, fldHeight * 2);            fldAdditionalInfo.Widget.DefaultAppearance.Font = tf.Font;            fldAdditionalInfo.Widget.DefaultAppearance.FontSize = tf.FontSize;            doc.AcroForm.Fields.Add(fldAdditionalInfo);            ip.Y += dY * 2;
            // Submit form button:            var btnSubmit = new PushButtonField();            btnSubmit.Widget.Rect = new RectangleF(ip.X + fldOffset, ip.Y, 72, fldHeight);            btnSubmit.Widget.ButtonAppearance.Caption = "Submit";            btnSubmit.Widget.Highlighting = HighlightingMode.Invert;            btnSubmit.Widget.Page = page;
            // The URL for the submission:            btnSubmit.Widget.Activate = new ActionSubmitForm("/Samples/HandleFormSubmitXml");            doc.AcroForm.Fields.Add(btnSubmit);
            // Reset form button:            var btnReset = new PushButtonField();            btnReset.Widget.Rect = new RectangleF(ip.X + fldOffset + 72 * 1.5f, ip.Y, 72, fldHeight);            btnReset.Widget.ButtonAppearance.Caption = "Reset";            btnReset.Widget.Highlighting = HighlightingMode.Invert;            btnReset.Widget.Page = page;            btnReset.Widget.Activate = new ActionResetForm();            doc.AcroForm.Fields.Add(btnReset);            ip.Y += dY;
            // Done:            doc.Save(stream);            return doc.Pages.Count;        }
        //        // NOTE: the code below is used by the web sample browser controller when the form        // prepared by this sample is submitted, it is not directly called by the CreatePDF() method.        //
        // Creates a GcPdfDocument, loads an AcroForm PDF into it, and fills it with data        // using the GcPdfDocument.ImportFormDataFromXML() method.        //        // This method is called by the samples controller when the form prepared by this sample        // is submitted by the user. The samples controller parses the client response and builds        // the 'values' collection filling it with the submitted field values, then calls        // this method to prepare the XML, imports it into a newly created PDF, and returns        // the resulting PDF to the controller, which sends it back to the client.        public static Stream ImportFormData(List<FieldExportEntry> values)        {            var pdf = new GcPdfDocument();            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "ImportFormXML.pdf"));            pdf.Load(fs);            using (var ms = new MemoryStream())            {                SaveFieldsToXML(values, ms);                ms.Seek(0, SeekOrigin.Begin);                pdf.ImportFormDataFromXML(ms);            }            var outMs = new MemoryStream();            pdf.Save(outMs);            outMs.Seek(0, SeekOrigin.Begin);            return outMs;        }
        // Represents a form field and its value(s) for export to XML.        public class FieldExportEntry        {            public string Name { get; set; }            public List<string> Values { get; set; }            // Note: this sample does not support child fields:            // public List<FieldTreeNode> Children { get; set; }        }
        // Saves the fields and their values to a stream.        //        // This method is similar to GcPdfDocument.ExportFormDataToXML(), with the following        // important limitations:        // - it does not support child fields (field.Children collection);        // - it does not handle fields with names that are not valid XML names (xfdf:original).        public static void SaveFieldsToXML(List<FieldExportEntry> values, Stream stream)        {            var xws = new XmlWriterSettings()            {                Indent = true,                CloseOutput = false,                Encoding = Encoding.UTF8,            };            using XmlWriter xw = XmlWriter.Create(stream, xws);            xw.WriteStartElement("fields");            xw.WriteAttributeString("xmlns", "xfdf", null, "http://ns.adobe.com/xfdf-transition/");            foreach (var ftn in values)            {                xw.WriteStartElement(ftn.Name);                foreach (var v in ftn.Values)                {                    xw.WriteStartElement("value");                    // NOTE: the values in the array are formed by the client PDF viewer,                    // and it represents 'on' checkbox values as 'true', while ImportFormDataFromXML                    // expects 'on' values to be represented as "Yes" (that's how ExportFormDataToXML                    // works, similar to Acrobat). This here is a quick and dirty hack just for the                    // sake of this sample:                    xw.WriteString(v == "true" ? "Yes" : v);                    xw.WriteEndElement();                }                xw.WriteEndElement();            }            xw.WriteEndElement();        }    }}