//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using System.Drawing;using System.Text;using GrapeCity.Documents.Pdf;using GrapeCity.Documents.Text;using GrapeCity.Documents.Pdf.AcroForms;
namespace DsPdfWeb.Demos{    // This sample loads the form created by the FormFields sample,    // loops through all form fields found in that file,    // and modifies the values of input fields.    // The log of what was done (showing old and new values) is added to the form page.    public class FillForm    {        public int CreatePDF(Stream stream)        {            // The original file stream must be kept open while working with the loaded PDF, see LoadPDF for details:            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "FormFields.pdf"));            var doc = new GcPdfDocument();            doc.Load(fs);            var page = doc.Pages.Last;            var sb = new StringBuilder();            sb.AppendLine("Log of updates made by the FillForm sample:\r\n");
            foreach (Field fld in doc.AcroForm.Fields)            {                if (fld is CombTextField ctfld)                {                    sb.Append($"CombTextField.Value was '{ctfld.Value}', ");                    ctfld.Value = "Comb text";                    sb.AppendLine($"now '{ctfld.Value}'.");                }                else if (fld is TextField tfld)                {                    sb.Append($"TextField.Value was '{tfld.Value}', ");                    tfld.Value = $"Text updated on {Common.Util.TimeNow():u}";                    sb.AppendLine($"now '{tfld.Value}'.");                }                else if (fld is CheckBoxField cfld)                {                    sb.Append($"CheckBoxField.Value was '{cfld.Checked}', ");                    cfld.Checked = !cfld.Checked;                    sb.AppendLine($"now '{cfld.Checked}'.");                }                else if (fld is RadioButtonField rbfld)                {                    sb.Append($"RadioButtonField.Value was '{rbfld.Value}', ");                    rbfld.Value = rbfld.Widgets.Count - 1;                    sb.AppendLine($"now '{rbfld.Value}'.");                }                else if (fld is ComboBoxField cmbfld)                {                    sb.Append($"ComboBoxField selection was '{cmbfld.Items[cmbfld.SelectedIndex].Text}', ");                    cmbfld.SelectedIndex = cmbfld.Items.Count - 1;                    sb.AppendLine($"now '{cmbfld.Items[cmbfld.SelectedIndex].Text}'.");                }                else if (fld is ListBoxField lbfld)                {                    sb.Append($"ListBoxField selection was '{lbfld.Items[lbfld.SelectedIndex].Text}', ");                    lbfld.SelectedIndex = lbfld.Items.Count - 1;                    sb.AppendLine($"now '{lbfld.Items[lbfld.SelectedIndex].Text}'.");                }                else if (fld is SignatureField sfld)                {                    sb.AppendLine("SignatureField found.");                }                else if (fld is PushButtonField btnfld)                {                    sb.AppendLine($"PushButtonField '{btnfld.Widget.ButtonAppearance.Caption}' found.");                }                else                {                    sb.AppendLine($"Field '{fld}' found/");                }            }            // Add a log of what we did at the bottom of the page:            var tl = new TextLayout(72)            {                MaxWidth = page.Size.Width,                MaxHeight = page.Size.Height,                MarginLeft = 80,                MarginRight = 80,                MarginBottom = 80,                ParagraphAlignment = ParagraphAlignment.Far            };            tl.Append(sb.ToString(), new TextFormat() { Font = StandardFonts.Times, FontSize = 12 });            tl.PerformLayout(true);            var rc = tl.ContentRectangle;            rc.Inflate(8, 8);            page.Graphics.FillRectangle(rc, Color.LightYellow);            page.Graphics.DrawRectangle(rc, Color.Orange);            page.Graphics.DrawTextLayout(tl, PointF.Empty);
            // Done:            doc.Save(stream);            return doc.Pages.Count;        }    }}