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/* Printing
*
* GtkPrintOperation offers a simple API to support printing in a cross-platform way.
*/
using System;
using System.IO;
using System.Reflection;
using Gtk;
using Cairo;
namespace GtkDemo
{
[Demo ("Printing", "DemoPrinting.cs")]
public class DemoPrinting
{
private static double headerHeight = (10*72/25.4);
private static double headerGap = (3*72/25.4);
private static int pangoScale = 1024;
private PrintOperation print;
private string fileName = "DemoPrinting.cs";
private double fontSize = 12.0;
private int linesPerPage;
private string[] lines;
private int numLines;
private int numPages;
public DemoPrinting ()
{
print = new PrintOperation ();
print.BeginPrint += new BeginPrintHandler (OnBeginPrint);
print.DrawPage += new DrawPageHandler (OnDrawPage);
print.EndPrint += new EndPrintHandler (OnEndPrint);
print.Run (PrintOperationAction.PrintDialog, null);
}
private void OnBeginPrint (object obj, Gtk.BeginPrintArgs args)
{
string contents;
double height;
PrintContext context = args.Context;
height = context.Height;
linesPerPage = (int)Math.Floor(height / fontSize);
contents = LoadFile("DemoPrinting.cs");
lines = contents.Split('\n');
numLines = lines.Length;
numPages = (numLines - 1) / linesPerPage + 1;
print.NPages = numPages;
}
private string LoadFile (string filename)
{
Stream file = Assembly.GetExecutingAssembly ().GetManifestResourceStream
(filename);
if (file == null && File.Exists (filename)) {
file = File.OpenRead (filename);
}
if (file == null) {
return "File not found";
}
StreamReader sr = new StreamReader (file);
return sr.ReadToEnd ();
}
private void OnDrawPage (object obj, Gtk.DrawPageArgs args)
{
PrintContext context = args.Context;
Cairo.Context cr = context.CairoContext;
double width = context.Width;
cr.Rectangle (0, 0, width, headerHeight);
cr.SetSourceRGB (0.8, 0.8, 0.8);
cr.FillPreserve ();
cr.SetSourceRGB (0, 0, 0);
cr.LineWidth = 1;
cr.Stroke();
Pango.Layout layout = context.CreatePangoLayout ();
Pango.FontDescription desc = Pango.FontDescription.FromString ("sans 14");
layout.FontDescription = desc;
layout.SetText (fileName);
layout.Width = (int)width;
layout.Alignment = Pango.Alignment.Center;
int layoutWidth, layoutHeight;
layout.GetSize (out layoutWidth, out layoutHeight);
double textHeight = (double)layoutHeight / (double)pangoScale;
cr.MoveTo (width/2, (headerHeight - textHeight) / 2);
Pango.CairoHelper.ShowLayout (cr, layout);
string pageStr = String.Format ("{0}/{1}", args.PageNr + 1, numPages);
layout.SetText (pageStr);
layout.Alignment = Pango.Alignment.Right;
cr.MoveTo (width - 2, (headerHeight - textHeight) / 2);
Pango.CairoHelper.ShowLayout (cr, layout);
layout = null;
layout = context.CreatePangoLayout ();
desc = Pango.FontDescription.FromString ("mono");
desc.Size = (int)(fontSize * pangoScale);
layout.FontDescription = desc;
cr.MoveTo (0, headerHeight + headerGap);
int line = args.PageNr * linesPerPage;
for (int i=0; i < linesPerPage && line < numLines; i++)
{
layout.SetText (lines[line]);
Pango.CairoHelper.ShowLayout (cr, layout);
cr.RelMoveTo (0, fontSize);
line++;
}
(cr as IDisposable).Dispose ();
layout = null;
}
private void OnEndPrint (object obj, Gtk.EndPrintArgs args)
{
}
}
}
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