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