//
// This code is part of Document Solutions for PDF demos.
// Copyright (c) MESCIUS inc. All rights reserved.
//
using System;
using System.IO;
using System.Linq;
using System.Drawing;
using System.Collections.Generic;
using GrapeCity.Documents.Pdf;
using GrapeCity.Documents.Pdf.AcroForms;
using GrapeCity.Documents.Text;
using GrapeCity.Documents.Common;
using GrapeCity.Documents.Drawing;
using GrapeCity.Documents.Pdf.Security;
using System.Security.Cryptography.X509Certificates;
using GCTEXT = GrapeCity.Documents.Text;
using GCDRAW = GrapeCity.Documents.Drawing;
namespace DsPdfWeb.Demos
{
// This sample is almost the same as TimeSheet, with one significant difference:
// unlike the other sample, in this one the filled form is digitally signed by
// the employee, and the signed PDF is signed again by the supervisor using
// incremental update (the only way to sign an already signed PDF while
// preserving the validity of the first signature).
//
// NOTE: if you download this sample and run it locally on your own system,
// you will need to have a valid license for it to work as expected, because
// in an unlicensed version the automatically added nag page caption will
// invalidate the employee's signature.
public class TimeSheetIncremental
{
// Font collection to hold the fonts we need:
private FontCollection _fc = new FontCollection();
// The text layout used to render input fields when flattening the document:
private TextLayout _inputTl = new TextLayout(72);
// The text format used for input fields:
private TextFormat _inputTf = new TextFormat();
private GCTEXT.Font _inputFont = FontCollection.SystemFonts.FindFamilyName("Segoe UI", true);
private float _inputFontSize = 12;
// Input fields margin:
private float _inputMargin = 5;
// Space for employee's signature:
private RectangleF _empSignRect;
//
private GCDRAW.Image _logo;
// Main entry point of this sample:
public int CreatePDF(Stream stream)
{
// Set up a font collection with the fonts we need:
_fc.RegisterDirectory(Path.Combine("Resources", "Fonts"));
// Set that font collection on input fields' text layout
// (we will also set it on all text layouts that we'll use):
_inputTl.FontCollection = _fc;
// Set up layout and formatting for input fields:
_inputTl.ParagraphAlignment = ParagraphAlignment.Center;
_inputTf.Font = _inputFont;
_inputTf.FontSize = _inputFontSize;
// Create the time sheet input form
// (in a real-life scenario, we probably would only create it once,
// and then re-use the form PDF):
var doc = MakeTimeSheetForm();
// At this point, 'doc' is an empty AcroForm.
// In a real-life app it would be distributed to employees
// for them to fill and send back.
using (var empSignedStream = FillEmployeeData(doc))
{
//
// At this point 'empSignedStream' contains the form filled with employee's data and signed by them.
//
// Load the employee-signed document:
doc.Load(empSignedStream);
// Fill in supervisor data:
var supName = "Jane Donahue";
var supSignDate = Common.Util.TimeNow().ToShortDateString();
SetFieldValue(doc, _Names.EmpSuper, supName);
SetFieldValue(doc, _Names.SupSignDate, supSignDate);
// Digitally sign the document on behalf of the supervisor:
var pfxPath = Path.Combine("Resources", "Misc", "DsPdfTest.pfx");
var cert = new X509Certificate2(File.ReadAllBytes(pfxPath), "qq",
X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.Exportable);
var sp = new SignatureProperties()
{
SignatureBuilder = new Pkcs7SignatureBuilder()
{
CertificateChain = new X509Certificate2[] { cert },
HashAlgorithm = OID.HashAlgorithms.SHA512
},
Location = "DsPdfWeb - TimeSheet Incremental",
SignerName = supName,
SigningDateTime = Common.Util.TimeNow(),
// Connect the signature field and signature props:
SignatureField = doc.AcroForm.Fields.First(f_ => f_.Name == _Names.SupSign) as SignatureField,
};
// Any changes to the document would invalidate the employee's signature, so we cannot do this:
// supSign.Widget.ButtonAppearance.Caption = supName;
//
// Done, now save the document with supervisor signature:
// NOTE: in order to not invalidate the employee's signature,
// we MUST use incremental update here (which is true by default in Sign() method):
doc.Sign(sp, stream);
_logo.Dispose();
return doc.Pages.Count;
}
}
// Replaces any text fields in the document with regular text,
// except the fields listed in 'excludeFields':
private void FlattenDoc(GcPdfDocument doc, params string[] excludeFields)
{
foreach (var f in doc.AcroForm.Fields)
{
if (f is TextField fld && !excludeFields.Contains(fld.Name))
{
var w = fld.Widget;
var g = w.Page.Graphics;
_inputTl.Clear();
_inputTl.Append(fld.Value, _inputTf);
_inputTl.MaxHeight = w.Rect.Height;
_inputTl.PerformLayout(true);
g.DrawTextLayout(_inputTl, w.Rect.Location);
}
}
for (int i = doc.AcroForm.Fields.Count - 1; i >= 0; --i)
if (doc.AcroForm.Fields[i] is TextField fld && !excludeFields.Contains(fld.Name))
doc.AcroForm.Fields.RemoveAt(i);
}
// Data field names:
static class _Names
{
public static readonly string[] Dows = new string[]
{
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
};
public const string EmpName = "empName";
public const string EmpTitle = "empTitle";
public const string EmpNum = "empNum";
public const string EmpStatus = "empStatus";
public const string EmpDep = "empDep";
public const string EmpSuper = "empSuper";
public static Dictionary<string, string[]> DtNames = new Dictionary<string, string[]>()
{
{"Sun", new string[] { "dtSun", "tSunStart", "tSunEnd", "tSunReg", "tSunOvr", "tSunTotal" } },
{"Mon", new string[] { "dtMon", "tMonStart", "tMonEnd", "tMonReg", "tMonOvr", "tMonTotal" } },
{"Tue", new string[] { "dtTue", "tTueStart", "tTueEnd", "tTueReg", "tTueOvr", "tTueTotal" } },
{"Wed", new string[] { "dtWed", "tWedStart", "tWedEnd", "tWedReg", "tWedOvr", "tWedTotal" } },
{"Thu", new string[] { "dtThu", "tThuStart", "tThuEnd", "tThuReg", "tThuOvr", "tThuTotal" } },
{"Fri", new string[] { "dtFri", "tFriStart", "tFriEnd", "tFriReg", "tFriOvr", "tFriTotal" } },
{"Sat", new string[] { "dtSat", "tSatStart", "tSatEnd", "tSatReg", "tSatOvr", "tSatTotal" } },
};
public const string TotalReg = "totReg";
public const string TotalOvr = "totOvr";
public const string TotalHours = "totHours";
public const string EmpSign = "empSign";
public const string EmpSignDate = "empSignDate";
public const string SupSign = "supSign";
public const string SupSignDate = "supSignDate";
}
// Creates the Time Sheet form:
private GcPdfDocument MakeTimeSheetForm()
{
const float marginH = 72, marginV = 48;
var doc = new GcPdfDocument();
var page = doc.NewPage();
var g = page.Graphics;
var ip = new PointF(marginH, marginV);
var tl = new TextLayout(g.Resolution) { FontCollection = _fc };
tl.Append("TIME SHEET", new TextFormat() { FontName = "Segoe UI", FontSize = 18 });
tl.PerformLayout(true);
g.DrawTextLayout(tl, ip);
ip.Y += tl.ContentHeight + 15;
_logo = GCDRAW.Image.FromFile(Path.Combine("Resources", "ImagesBis", "AcmeLogo-vertical-250px.png"));
var s = new SizeF(250f * 0.75f, 64f * 0.75f);
g.DrawImage(_logo, new RectangleF(ip, s), null, ImageAlign.Default);
ip.Y += s.Height + 5;
tl.Clear();
tl.Append("Where Business meets Technology",
new TextFormat() { FontName = "Segoe UI", FontItalic = true, FontSize = 10 });
tl.PerformLayout(true);
g.DrawTextLayout(tl, ip);
ip.Y += tl.ContentHeight + 15;
tl.Clear();
tl.Append("1901, Halford Avenue,\r\nSanta Clara, California – 95051-2553,\r\nUnited States",
new TextFormat() { FontName = "Segoe UI", FontSize = 9 });
tl.MaxWidth = page.Size.Width - marginH * 2;
tl.TextAlignment = TextAlignment.Trailing;
tl.PerformLayout(true);
g.DrawTextLayout(tl, ip);
ip.Y += tl.ContentHeight + 25;
var pen = new GCDRAW.Pen(Color.Gray, 0.5f);
var colw = (page.Size.Width - marginH * 2) / 2;
var fields1 = DrawTable(ip,
new float[] { colw, colw },
new float[] { 30, 30, 30 },
g, pen);
var tf = new TextFormat() { FontName = "Segoe UI", FontSize = 9 };
tl.ParagraphAlignment = ParagraphAlignment.Center;
tl.TextAlignment = TextAlignment.Leading;
tl.MarginLeft = tl.MarginRight = tl.MarginTop = tl.MarginBottom = 4;
// t_ - caption
// b_ - bounds
// f_ - field name, null means no field
Action<string, RectangleF, string> drawField = (t_, b_, f_) =>
{
float tWidth;
if (!string.IsNullOrEmpty(t_))
{
tl.Clear();
tl.MaxHeight = b_.Height;
tl.MaxWidth = b_.Width;
tl.Append(t_, tf);
tl.PerformLayout(true);
g.DrawTextLayout(tl, b_.Location);
tWidth = tl.ContentRectangle.Right;
}
else
tWidth = 0;
if (!string.IsNullOrEmpty(f_))
{
var fld = new TextField() { Name = f_ };
fld.Widget.Page = page;
fld.Widget.Rect = new RectangleF(
b_.X + tWidth + _inputMargin, b_.Y + _inputMargin,
b_.Width - tWidth - _inputMargin * 2, b_.Height - _inputMargin * 2);
fld.Widget.DefaultAppearance.Font = _inputFont;
fld.Widget.DefaultAppearance.FontSize = _inputFontSize;
fld.Widget.Border.Color = Color.LightSlateGray;
fld.Widget.Border.Width = 0.5f;
doc.AcroForm.Fields.Add(fld);
}
};
drawField("EMPLOYEE NAME: ", fields1[0, 0], _Names.EmpName);
drawField("TITLE: ", fields1[1, 0], _Names.EmpTitle);
drawField("EMPLOYEE NUMBER: ", fields1[0, 1], _Names.EmpNum);
drawField("STATUS: ", fields1[1, 1], _Names.EmpStatus);
drawField("DEPARTMENT: ", fields1[0, 2], _Names.EmpDep);
drawField("SUPERVISOR: ", fields1[1, 2], _Names.EmpSuper);
ip.Y = fields1[0, 2].Bottom;
float col0 = 100;
colw = (page.Size.Width - marginH * 2 - col0) / 5;
float rowh = 25;
var fields2 = DrawTable(ip,
new float[] { col0, colw, colw, colw, colw, colw },
new float[] { 50, rowh, rowh, rowh, rowh, rowh, rowh, rowh, rowh },
g, pen);
tl.ParagraphAlignment = ParagraphAlignment.Far;
drawField("DATE", fields2[0, 0], null);
drawField("START TIME", fields2[1, 0], null);
drawField("END TIME", fields2[2, 0], null);
drawField("REGULAR HOURS", fields2[3, 0], null);
drawField("OVERTIME HOURS", fields2[4, 0], null);
tf.FontBold = true;
drawField("TOTAL HOURS", fields2[5, 0], null);
tf.FontBold = false;
tl.ParagraphAlignment = ParagraphAlignment.Center;
tf.ForeColor = Color.Gray;
for (int i = 0; i < 7; ++i)
drawField(_Names.Dows[i], fields2[0, i + 1], _Names.DtNames[_Names.Dows[i]][0]);
// Vertically align date fields (compensate for different DOW widths):
var dowFields = doc.AcroForm.Fields.TakeLast(7);
var minW = dowFields.Min(f_ => ((TextField)f_).Widget.Rect.Width);
dowFields.ToList().ForEach(f_ =>
{
var r_ = ((TextField)f_).Widget.Rect;
r_.Offset(r_.Width - minW, 0);
r_.Width = minW;
((TextField)f_).Widget.Rect = r_;
});
tf.ForeColor = Color.Black;
for (int row = 1; row <= 7; ++row)
for (int col = 1; col <= 5; ++col)
drawField(null, fields2[col, row], _Names.DtNames[_Names.Dows[row - 1]][col]);
tf.FontBold = true;
drawField("WEEKLY TOTALS", fields2[0, 8], null);
tf.FontBold = false;
drawField(null, fields2[3, 8], _Names.TotalReg);
drawField(null, fields2[4, 8], _Names.TotalOvr);
drawField(null, fields2[5, 8], _Names.TotalHours);
ip.Y = fields2[0, 8].Bottom;
col0 = 72 * 4;
colw = page.Size.Width - marginH * 2 - col0;
var fields3 = DrawTable(ip,
new float[] { col0, colw },
new float[] { rowh + 10, rowh, rowh },
g, pen);
drawField("EMPLOYEE SIGNATURE: ", fields3[0, 1], null);
// Employee signature:
var r = fields3[0, 1];
_empSignRect = new RectangleF(r.X + r.Width / 2, r.Y, r.Width / 2 - _inputMargin * 2, r.Height);
var sf = new SignatureField() { Name = _Names.EmpSign };
sf.Widget.Rect = new RectangleF(r.X + r.Width / 2, r.Y + _inputMargin, r.Width / 2 - _inputMargin * 2, r.Height - _inputMargin * 2);
sf.Widget.Page = page;
sf.Widget.BackColor = Color.LightSeaGreen;
doc.AcroForm.Fields.Add(sf);
drawField("DATE: ", fields3[1, 1], _Names.EmpSignDate);
drawField("SUPERVISOR SIGNATURE: ", fields3[0, 2], null);
// Supervisor signature:
r = fields3[0, 2];
sf = new SignatureField() { Name = _Names.SupSign };
sf.Widget.Rect = new RectangleF(r.X + r.Width / 2, r.Y + _inputMargin, r.Width / 2 - _inputMargin * 2, r.Height - _inputMargin * 2);
sf.Widget.Page = page;
sf.Widget.BackColor = Color.LightYellow;
doc.AcroForm.Fields.Add(sf);
drawField("DATE: ", fields3[1, 2], _Names.SupSignDate);
// Done:
return doc;
}
// Simple table drawing method. Returns the array of table cell rectangles.
private RectangleF[,] DrawTable(PointF loc, float[] widths, float[] heights, GcGraphics g, GCDRAW.Pen p)
{
if (widths.Length == 0 || heights.Length == 0)
throw new Exception("Table must have some columns and rows.");
RectangleF[,] cells = new RectangleF[widths.Length, heights.Length];
var r = new RectangleF(loc, new SizeF(widths.Sum(), heights.Sum()));
// Draw left borders (except for 1st one):
float x = loc.X;
for (int i = 0; i < widths.Length; ++i)
{
for (int j = 0; j < heights.Length; ++j)
{
cells[i, j].X = x;
cells[i, j].Width = widths[i];
}
if (i > 0)
g.DrawLine(x, r.Top, x, r.Bottom, p);
x += widths[i];
}
// Draw top borders (except for 1st one):
float y = loc.Y;
for (int j = 0; j < heights.Length; ++j)
{
for (int i = 0; i < widths.Length; ++i)
{
cells[i, j].Y = y;
cells[i, j].Height = heights[j];
}
if (j > 0)
g.DrawLine(r.Left, y, r.Right, y, p);
y += heights[j];
}
// Draw outer border:
g.DrawRectangle(r, p);
// Done:
return cells;
}
// Fill in employee info and working hours with sample data:
private Stream FillEmployeeData(GcPdfDocument doc)
{
// For the purposes of this sample, we fill the form with random data:
var empName = "Jaime Smith";
SetFieldValue(doc, _Names.EmpName, empName);
SetFieldValue(doc, _Names.EmpNum, "12345");
SetFieldValue(doc, _Names.EmpDep, "Research & Development");
SetFieldValue(doc, _Names.EmpTitle, "Senior Developer");
SetFieldValue(doc, _Names.EmpStatus, "Full Time");
var rand = new Random((int)Common.Util.TimeNow().Ticks);
DateTime workday = Common.Util.TimeNow().AddDays(-15);
while (workday.DayOfWeek != DayOfWeek.Sunday)
workday = workday.AddDays(1);
TimeSpan wkTot = TimeSpan.Zero, wkReg = TimeSpan.Zero, wkOvr = TimeSpan.Zero;
for (int i = 0; i < 7; ++i)
{
// Start time:
var start = new DateTime(workday.Year, workday.Month, workday.Day, rand.Next(6, 12), rand.Next(0, 59), 0);
SetFieldValue(doc, _Names.DtNames[_Names.Dows[i]][0], start.ToShortDateString());
SetFieldValue(doc, _Names.DtNames[_Names.Dows[i]][1], start.ToShortTimeString());
// End time:
var end = start.AddHours(rand.Next(8, 14)).AddMinutes(rand.Next(0, 59));
SetFieldValue(doc, _Names.DtNames[_Names.Dows[i]][2], end.ToShortTimeString());
var tot = end - start;
var reg = TimeSpan.FromHours((start.DayOfWeek != DayOfWeek.Saturday && start.DayOfWeek != DayOfWeek.Sunday) ? 8 : 0);
var ovr = tot.Subtract(reg);
SetFieldValue(doc, _Names.DtNames[_Names.Dows[i]][3], reg.ToString(@"hh\:mm"));
SetFieldValue(doc, _Names.DtNames[_Names.Dows[i]][4], ovr.ToString(@"hh\:mm"));
SetFieldValue(doc, _Names.DtNames[_Names.Dows[i]][5], tot.ToString(@"hh\:mm"));
wkTot += tot;
wkOvr += ovr;
wkReg += reg;
//
workday = workday.AddDays(1);
}
SetFieldValue(doc, _Names.TotalReg, wkReg.TotalHours.ToString("F"));
SetFieldValue(doc, _Names.TotalOvr, wkOvr.TotalHours.ToString("F"));
SetFieldValue(doc, _Names.TotalHours, wkTot.TotalHours.ToString("F"));
SetFieldValue(doc, _Names.EmpSignDate, workday.ToShortDateString());
// Digitally sign the document on behalf of the 'employee':
var pfxPath = Path.Combine("Resources", "Misc", "JohnDoe.pfx");
var cert = new X509Certificate2(File.ReadAllBytes(pfxPath), "secret",
X509KeyStorageFlags.MachineKeySet | X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.Exportable);
var sp = new SignatureProperties()
{
SignatureBuilder = new Pkcs7SignatureBuilder()
{
CertificateChain = new X509Certificate2[] { cert }
},
DocumentAccessPermissions = AccessPermissions.FormFillingAndAnnotations,
Reason = "I confirm time sheet is correct.",
Location = "TimeSheetIncremental sample",
SignerName = empName,
SigningDateTime = Common.Util.TimeNow(),
};
// Connect the signature field and signature props:
SignatureField empSign = doc.AcroForm.Fields.First(f_ => f_.Name == _Names.EmpSign) as SignatureField;
sp.SignatureField = empSign;
empSign.Widget.ButtonAppearance.Caption = empName;
// Some browser PDF viewers do not show form fields, so we render a placeholder:
empSign.Widget.Page.Graphics.DrawString("digitally signed", new TextFormat() { FontName = "Segoe UI", FontSize = 9 }, empSign.Widget.Rect);
// We now 'flatten' the form: loop over document AcroForm's fields,
// drawing their current values in place, and then remove the fields.
// This produces a PDF with text fields' values as part of the regular
// (non-editable) content (we leave fields filled by the supervisor):
FlattenDoc(doc, _Names.EmpSuper, _Names.SupSignDate);
// Done, now save the document with employee's signature:
var ms = new MemoryStream();
// Note that we do NOT use incremental update here (3rd parameter is false)
// as this is not needed yet (but will be needed/used when signing by supervisor later):
doc.Sign(sp, ms, false);
return ms;
}
// Sets the value of a field with the specified name:
private void SetFieldValue(GcPdfDocument doc, string name, string value)
{
var fld = doc.AcroForm.Fields.First(f_ => f_.Name == name);
if (fld != null)
fld.Value = value;
}
}
}