gtkprintoperation-unix.c 25.5 KB
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/* GTK - The GIMP Toolkit
 * gtkprintoperation-unix.c: Print Operation Details for Unix and Unix like platforms
 * Copyright (C) 2006, Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "config.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
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#include <errno.h>
#include <stdlib.h>       
#include <fcntl.h>
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#include "gtkprintoperation-private.h"
#include "gtkmarshal.h"
#include "gtkmessagedialog.h"

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#include <cairo-pdf.h>
#include <cairo-ps.h>
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#include "gtkprintunixdialog.h"
#include "gtkpagesetupunixdialog.h"
#include "gtkprintbackend.h"
#include "gtkprinter.h"
#include "gtkprintjob.h"
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#include "gtklabel.h"
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#include "gtkalias.h"
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#include "gtkintl.h"
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typedef struct 
{
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  GtkWindow *parent;        /* just in case we need to throw error dialogs */
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  GMainLoop *loop;
  gboolean data_sent;
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  /* Real printing (not preview: */
  GtkPrintJob *job;         /* the job we are sending to the printer */
  cairo_surface_t *surface;
  gulong job_status_changed_tag;

  
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} GtkPrintOperationUnix;

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typedef struct _PrinterFinder PrinterFinder;

static void printer_finder_free (PrinterFinder *finder);
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static void find_printer        (const gchar   *printer,
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				 GFunc          func,
				 gpointer       data);

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static void
unix_start_page (GtkPrintOperation *op,
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		 GtkPrintContext   *print_context,
		 GtkPageSetup      *page_setup)
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{
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  GtkPrintOperationUnix *op_unix;  
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  GtkPaperSize *paper_size;
  cairo_surface_type_t type;
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  gdouble w, h;
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  op_unix = op->priv->platform_data;
  
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  paper_size = gtk_page_setup_get_paper_size (page_setup);

  w = gtk_paper_size_get_width (paper_size, GTK_UNIT_POINTS);
  h = gtk_paper_size_get_height (paper_size, GTK_UNIT_POINTS);
  
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  type = cairo_surface_get_type (op_unix->surface);
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  if (type == CAIRO_SURFACE_TYPE_PS)
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    cairo_ps_surface_set_size (op_unix->surface, w, h);
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  else if (type == CAIRO_SURFACE_TYPE_PDF)
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    cairo_pdf_surface_set_size (op_unix->surface, w, h);
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}

static void
unix_end_page (GtkPrintOperation *op,
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	       GtkPrintContext   *print_context)
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{
  cairo_t *cr;

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  cr = gtk_print_context_get_cairo_context (print_context);
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  cairo_show_page (cr);
}

static void
op_unix_free (GtkPrintOperationUnix *op_unix)
{
  if (op_unix->job)
    {
      g_signal_handler_disconnect (op_unix->job,
				   op_unix->job_status_changed_tag);
      g_object_unref (op_unix->job);
    }

  g_free (op_unix);
}

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static gchar *
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shell_command_substitute_file (const gchar *cmd,
			       const gchar *filename)
{
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  const gchar *inptr, *start;
  gchar *result;
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  GString *final;

  g_return_val_if_fail (cmd != NULL, NULL);
  g_return_val_if_fail (filename != NULL, NULL);

  result = NULL;
  final = g_string_new (NULL);

  start = inptr = cmd;

  while ((inptr = strchr (inptr, '%')) != NULL) 
    {
      g_string_append_len (final, start, inptr - start);
      inptr++;
      switch (*inptr) 
        {
          case 'f':
            g_string_append (final, filename ? filename : "");
            break;

          case '%':
            g_string_append_c (final, '%');
            break;

          default:
            g_string_append_c (final, '%');
            if (*inptr)
              g_string_append_c (final, *inptr);
            break;
        }
      if (*inptr)
        inptr++;
      start = inptr;
    }
  g_string_append (final, start);

  result = final->str;

  g_string_free (final, FALSE);

  return result;
}

void
_gtk_print_operation_platform_backend_launch_preview (GtkPrintOperation *op,
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						      GtkWindow         *parent,
						      const gchar       *filename)
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{
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  gint argc;
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  gchar **argv;
  gchar *cmd;
  gchar *preview_cmd;
  GtkSettings *settings;
  gchar *quoted_filename;
  GdkScreen *screen;
  GError *error = NULL;
 
  settings = gtk_settings_get_default ();
  g_object_get (settings, "gtk-print-preview-command", &preview_cmd, NULL);

  quoted_filename = g_shell_quote (filename);
  cmd = shell_command_substitute_file (preview_cmd, quoted_filename);
  g_shell_parse_argv (cmd, &argc, &argv, &error);

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  if (error != NULL)
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    goto out;

  if (parent)
    screen = gtk_window_get_screen (parent);
  else
    screen = gdk_screen_get_default ();
  
  gdk_spawn_on_screen (screen, NULL, argv, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL, NULL, &error);

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  if (error != NULL)
    {
      GtkWidget *edialog;
      edialog = gtk_message_dialog_new (parent, 
                                        GTK_DIALOG_DESTROY_WITH_PARENT,
                                        GTK_MESSAGE_ERROR,
                                        GTK_BUTTONS_CLOSE,
                                        _("Error launching preview") /* FIXME better text */);
      gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (edialog),
                                                "%s", error->message);
      gtk_window_set_modal (GTK_WINDOW (edialog), TRUE);
      g_signal_connect (edialog, "response",
                        G_CALLBACK (gtk_widget_destroy), NULL);

      gtk_window_present (GTK_WINDOW (edialog));

      g_error_free (error); 
   } 

  g_free (cmd);
  g_free (quoted_filename);
  g_free (preview_cmd);
  g_strfreev (argv);
}

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static void
unix_finish_send  (GtkPrintJob *job,
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                   gpointer     user_data, 
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                   GError      *error)
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{
  GtkPrintOperationUnix *op_unix;

  op_unix = (GtkPrintOperationUnix *) user_data;

  if (error != NULL)
    {
      GtkWidget *edialog;
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      edialog = gtk_message_dialog_new (op_unix->parent, 
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                                        GTK_DIALOG_DESTROY_WITH_PARENT,
                                        GTK_MESSAGE_ERROR,
                                        GTK_BUTTONS_CLOSE,
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                                        _("Error printing") /* FIXME better text */);
      gtk_message_dialog_format_secondary_text (GTK_MESSAGE_DIALOG (edialog),
                                                "%s", error->message);
      gtk_window_set_modal (GTK_WINDOW (edialog), TRUE);
      g_signal_connect (edialog, "response",
                        G_CALLBACK (gtk_widget_destroy), NULL);

      gtk_window_present (GTK_WINDOW (edialog));
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    }
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  op_unix->data_sent = TRUE;
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  if (op_unix->loop)
    g_main_loop_quit (op_unix->loop);
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}

static void
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unix_end_run (GtkPrintOperation *op,
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	      gboolean           wait,
	      gboolean           cancelled)
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{
  GtkPrintOperationUnix *op_unix = op->priv->platform_data;
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  cairo_surface_finish (op_unix->surface);
  
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  if (cancelled)
    return;

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  if (wait)
    op_unix->loop = g_main_loop_new (NULL, FALSE);
  
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  /* TODO: Check for error */
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  if (op_unix->job != NULL)
    gtk_print_job_send (op_unix->job,
                        unix_finish_send, 
                        op_unix, NULL,
		        NULL);
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  if (wait)
    {
      if (!op_unix->data_sent)
	{
	  GDK_THREADS_LEAVE ();  
	  g_main_loop_run (op_unix->loop);
	  GDK_THREADS_ENTER ();  
	}
      g_main_loop_unref (op_unix->loop);
    }
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}

static void
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job_status_changed_cb (GtkPrintJob       *job, 
		       GtkPrintOperation *op)
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{
  _gtk_print_operation_set_status (op, gtk_print_job_get_status (job), NULL);
}

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static GtkWidget *
get_print_dialog (GtkPrintOperation *op,
                  GtkWindow         *parent)
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{
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  GtkPrintOperationPrivate *priv = op->priv;
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  GtkWidget *pd, *label;
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  GtkPageSetup *page_setup;
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  const gchar *custom_tab_label;
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  pd = gtk_print_unix_dialog_new (NULL, parent);

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  gtk_print_unix_dialog_set_manual_capabilities (GTK_PRINT_UNIX_DIALOG (pd),
						 GTK_PRINT_CAPABILITY_PAGE_SET |
						 GTK_PRINT_CAPABILITY_COPIES |
						 GTK_PRINT_CAPABILITY_COLLATE |
						 GTK_PRINT_CAPABILITY_REVERSE |
						 GTK_PRINT_CAPABILITY_SCALE);

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  if (priv->print_settings)
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    gtk_print_unix_dialog_set_settings (GTK_PRINT_UNIX_DIALOG (pd),
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					priv->print_settings);
  if (priv->default_page_setup)
    page_setup = gtk_page_setup_copy (priv->default_page_setup);
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  else
    page_setup = gtk_page_setup_new ();

  gtk_print_unix_dialog_set_page_setup (GTK_PRINT_UNIX_DIALOG (pd), 
                                        page_setup);
  g_object_unref (page_setup);
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  g_signal_emit_by_name (op, "create-custom-widget",
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			 &priv->custom_widget);

  if (priv->custom_widget) 
    {
      custom_tab_label = priv->custom_tab_label;
      
      if (custom_tab_label == NULL)
	{
	  custom_tab_label = g_get_application_name ();
	  if (custom_tab_label == NULL)
	    custom_tab_label = _("Application");
	}

      label = gtk_label_new (custom_tab_label);
      
      gtk_print_unix_dialog_add_custom_tab (GTK_PRINT_UNIX_DIALOG (pd),
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					    priv->custom_widget, label);
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    }
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  return pd;
}
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typedef struct 
{
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  GtkPrintOperation           *op;
  gboolean                     do_print;
  GError                     **error;
  GtkPrintOperationResult      result;
  GtkPrintOperationPrintFunc   print_cb;
  GDestroyNotify               destroy;
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  GtkWindow                   *parent;
  GMainLoop                   *loop;
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} PrintResponseData;

static void
print_response_data_free (gpointer data)
{
  PrintResponseData *rdata = data;

  g_object_unref (rdata->op);
  g_free (rdata);
}

static void
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finish_print (PrintResponseData *rdata,
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	      GtkPrinter        *printer,
	      GtkPageSetup      *page_setup,
	      GtkPrintSettings  *settings)
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{
  GtkPrintOperation *op = rdata->op;
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  GtkPrintOperationPrivate *priv = op->priv;
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  GtkPrintJob *job;
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  gboolean is_preview;
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  is_preview = rdata->result == GTK_PRINT_OPERATION_RESULT_PREVIEW;
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  if (rdata->do_print)
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    {
      gtk_print_operation_set_print_settings (op, settings);
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      priv->print_context = _gtk_print_context_new (op);
      _gtk_print_context_set_page_setup (priv->print_context, page_setup);
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      if (!is_preview)
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        {
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	  GtkPrintOperationUnix *op_unix;
	  cairo_t *cr;
	  
	  op_unix = g_new0 (GtkPrintOperationUnix, 1);     
	  priv->platform_data = op_unix;
	  priv->free_platform_data = (GDestroyNotify) op_unix_free;
	  op_unix->parent = rdata->parent;
	  
	  priv->start_page = unix_start_page;
	  priv->end_page = unix_end_page;
	  priv->end_run = unix_end_run;
	  
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	  job = gtk_print_job_new (priv->job_name, printer, settings, page_setup);
          op_unix->job = job;
          gtk_print_job_set_track_print_status (job, priv->track_print_status);
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	  op_unix->surface = gtk_print_job_get_surface (job, rdata->error);
	  if (op_unix->surface == NULL) 
            {
	      rdata->do_print = FALSE;
	      goto out;
            }
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	  cr = cairo_create (op_unix->surface);
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	  gtk_print_context_set_cairo_context (priv->print_context, cr, 72, 72);
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	  cairo_destroy (cr);

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          _gtk_print_operation_set_status (op, gtk_print_job_get_status (job), NULL);
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          op_unix->job_status_changed_tag =
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	    g_signal_connect (job, "status-changed",
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			      G_CALLBACK (job_status_changed_cb), op);
	  
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          priv->print_pages = job->print_pages;
          priv->page_ranges = job->page_ranges;
          priv->num_page_ranges = job->num_page_ranges;
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          priv->manual_num_copies = job->num_copies;
          priv->manual_collation = job->collate;
          priv->manual_reverse = job->reverse;
          priv->manual_page_set = job->page_set;
          priv->manual_scale = job->scale;
          priv->manual_orientation = job->rotate_to_orientation;
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        }
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    } 
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  if (rdata->print_cb)
    {
      if (rdata->do_print)
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        rdata->print_cb (op, rdata->parent, is_preview); 
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      else
       _gtk_print_operation_set_status (op, GTK_PRINT_STATUS_FINISHED_ABORTED, NULL); 
    }

  if (rdata->destroy)
    rdata->destroy (rdata);
}

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static void 
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handle_print_response (GtkWidget *dialog,
		       gint       response,
		       gpointer   data)
{
  GtkPrintUnixDialog *pd = GTK_PRINT_UNIX_DIALOG (dialog);
  PrintResponseData *rdata = data;
  GtkPrintSettings *settings = NULL;
  GtkPageSetup *page_setup = NULL;
  GtkPrinter *printer = NULL;

  if (response == GTK_RESPONSE_OK)
    {
      rdata->result = GTK_PRINT_OPERATION_RESULT_APPLY;

      printer = gtk_print_unix_dialog_get_selected_printer (GTK_PRINT_UNIX_DIALOG (pd));
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      if (printer != NULL)
	rdata->do_print = TRUE;
    } 
  else if (response == GTK_RESPONSE_APPLY)
    {
      /* print preview */
      rdata->result = GTK_PRINT_OPERATION_RESULT_PREVIEW;
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      rdata->do_print = TRUE;
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    }
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  if (rdata->do_print)
    {
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      settings = gtk_print_unix_dialog_get_settings (GTK_PRINT_UNIX_DIALOG (pd));
      page_setup = gtk_print_unix_dialog_get_page_setup (GTK_PRINT_UNIX_DIALOG (pd));
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      g_signal_emit_by_name (rdata->op, "custom-widget-apply", rdata->op->priv->custom_widget);
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    }
  
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  finish_print (rdata, printer, page_setup, settings);

  if (settings)
    g_object_unref (settings);
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  gtk_widget_destroy (GTK_WIDGET (pd));
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}


static void
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found_printer (GtkPrinter        *printer,
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	       PrintResponseData *rdata)
{
  GtkPrintOperation *op = rdata->op;
  GtkPrintOperationPrivate *priv = op->priv;
  GtkPrintSettings *settings = NULL;
  GtkPageSetup *page_setup = NULL;
  
  if (rdata->loop)
    g_main_loop_quit (rdata->loop);

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  if (printer != NULL) 
    {
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      rdata->result = GTK_PRINT_OPERATION_RESULT_APPLY;

      rdata->do_print = TRUE;

      if (priv->print_settings)
	settings = gtk_print_settings_copy (priv->print_settings);
      else
	settings = gtk_print_settings_new ();

      gtk_print_settings_set_printer (settings,
				      gtk_printer_get_name (printer));
      
      if (priv->default_page_setup)
	page_setup = gtk_page_setup_copy (priv->default_page_setup);
      else
	page_setup = gtk_page_setup_new ();
  }
  
  finish_print (rdata, printer, page_setup, settings);

  if (settings)
    g_object_unref (settings);
  
  if (page_setup)
    g_object_unref (page_setup);
}

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void
_gtk_print_operation_platform_backend_run_dialog_async (GtkPrintOperation          *op,
                                                        GtkWindow                  *parent,
							GtkPrintOperationPrintFunc  print_cb)
{
  GtkWidget *pd;
  PrintResponseData *rdata;
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  const gchar *printer_name;
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  rdata = g_new (PrintResponseData, 1);
  rdata->op = g_object_ref (op);
  rdata->do_print = FALSE;
  rdata->result = GTK_PRINT_OPERATION_RESULT_CANCEL;
  rdata->error = NULL;
  rdata->print_cb = print_cb;
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  rdata->parent = parent;
  rdata->loop = NULL;
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  rdata->destroy = print_response_data_free;
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  if (op->priv->show_dialog)
    {
      pd = get_print_dialog (op, parent);
      gtk_window_set_modal (GTK_WINDOW (pd), TRUE);
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      g_signal_connect (pd, "response", 
			G_CALLBACK (handle_print_response), rdata);
      
      gtk_window_present (GTK_WINDOW (pd));
    }
  else
    {
      printer_name = NULL;
      if (op->priv->print_settings)
	printer_name = gtk_print_settings_get_printer (op->priv->print_settings);
      
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      find_printer (printer_name, (GFunc) found_printer, rdata);
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    }
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}

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cairo_surface_t *
_gtk_print_operation_platform_backend_create_preview_surface (GtkPrintOperation *op,
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							      GtkPageSetup      *page_setup,
							      gdouble           *dpi_x,
							      gdouble           *dpi_y,
							      const gchar       *target)
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{
  GtkPaperSize *paper_size;
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  gdouble w, h;
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  paper_size = gtk_page_setup_get_paper_size (page_setup);
  w = gtk_paper_size_get_width (paper_size, GTK_UNIT_POINTS);
  h = gtk_paper_size_get_height (paper_size, GTK_UNIT_POINTS);
    
  *dpi_x = *dpi_y = 72;
  return cairo_pdf_surface_create (target, w, h);
}

void
_gtk_print_operation_platform_backend_resize_preview_surface (GtkPrintOperation *op,
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							      GtkPageSetup      *page_setup,
							      cairo_surface_t   *surface)
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{
  GtkPaperSize *paper_size;
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  gdouble w, h;
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  paper_size = gtk_page_setup_get_paper_size (page_setup);
  w = gtk_paper_size_get_width (paper_size, GTK_UNIT_POINTS);
  h = gtk_paper_size_get_height (paper_size, GTK_UNIT_POINTS);
  cairo_pdf_surface_set_size (surface, w, h);
}


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GtkPrintOperationResult
_gtk_print_operation_platform_backend_run_dialog (GtkPrintOperation *op,
						  GtkWindow         *parent,
						  gboolean          *do_print,
						  GError           **error)
 {
  GtkWidget *pd;
  PrintResponseData rdata;
  gint response;  
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  const gchar *printer_name;
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  rdata.op = op;
  rdata.do_print = FALSE;
  rdata.result = GTK_PRINT_OPERATION_RESULT_CANCEL;
  rdata.error = error;
  rdata.print_cb = NULL;
  rdata.destroy = NULL;
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  rdata.parent = parent;
  rdata.loop = NULL;
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  if (op->priv->show_dialog)
    {
      pd = get_print_dialog (op, parent);
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      response = gtk_dialog_run (GTK_DIALOG (pd));
      handle_print_response (pd, response, &rdata);
    }
  else
    {
      printer_name = NULL;
      if (op->priv->print_settings)
	printer_name = gtk_print_settings_get_printer (op->priv->print_settings);
      
      rdata.loop = g_main_loop_new (NULL, FALSE);
      find_printer (printer_name,
		    (GFunc) found_printer, &rdata);
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      GDK_THREADS_LEAVE ();  
      g_main_loop_run (rdata.loop);
      GDK_THREADS_ENTER ();  
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      g_main_loop_unref (rdata.loop);
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      rdata.loop = NULL;
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    }
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  *do_print = rdata.do_print;
  
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  return rdata.result;
}


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typedef struct 
{
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  GtkPageSetup         *page_setup;
  GtkPageSetupDoneFunc  done_cb;
  gpointer              data;
  GDestroyNotify        destroy;
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} PageSetupResponseData;

static void
page_setup_data_free (gpointer data)
{
  PageSetupResponseData *rdata = data;

  g_object_unref (rdata->page_setup);
  g_free (rdata);
}

static void
handle_page_setup_response (GtkWidget *dialog,
			    gint       response,
			    gpointer   data)
{
  GtkPageSetupUnixDialog *psd;
  PageSetupResponseData *rdata = data;
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  psd = GTK_PAGE_SETUP_UNIX_DIALOG (dialog);
  if (response == GTK_RESPONSE_OK)
    rdata->page_setup = gtk_page_setup_unix_dialog_get_page_setup (psd);

  gtk_widget_destroy (dialog);

  if (rdata->done_cb)
    rdata->done_cb (rdata->page_setup, rdata->data);

  if (rdata->destroy)
    rdata->destroy (rdata);
}

static GtkWidget *
get_page_setup_dialog (GtkWindow        *parent,
		       GtkPageSetup     *page_setup,
		       GtkPrintSettings *settings)
{
  GtkWidget *dialog;

  dialog = gtk_page_setup_unix_dialog_new (NULL, parent);
  if (page_setup)
    gtk_page_setup_unix_dialog_set_page_setup (GTK_PAGE_SETUP_UNIX_DIALOG (dialog),
					       page_setup);
  gtk_page_setup_unix_dialog_set_print_settings (GTK_PAGE_SETUP_UNIX_DIALOG (dialog),
						 settings);

  return dialog;
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}

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/**
 * gtk_print_run_page_setup_dialog:
 * @parent: transient parent, or %NULL
 * @page_setup: an existing #GtkPageSetup, or %NULL
 * @settings: a #GtkPrintSettings
 * 
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 * Runs a page setup dialog, letting the user modify the values from 
 * @page_setup. If the user cancels the dialog, the returned #GtkPageSetup 
 * is identical to the passed in @page_setup, otherwise it contains the 
 * modifications done in the dialog.
 *
 * Note that this function may use a recursive mainloop to show the page
 * setup dialog. See gtk_print_run_page_setup_dialog_async() if this is 
 * a problem.
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 * 
 * Return value: a new #GtkPageSetup
 *
 * Since: 2.10
 */
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GtkPageSetup *
gtk_print_run_page_setup_dialog (GtkWindow        *parent,
				 GtkPageSetup     *page_setup,
				 GtkPrintSettings *settings)
{
  GtkWidget *dialog;
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  gint response;
  PageSetupResponseData rdata;  
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  rdata.page_setup = NULL;
  rdata.done_cb = NULL;
  rdata.data = NULL;
  rdata.destroy = NULL;

  dialog = get_page_setup_dialog (parent, page_setup, settings);
  response = gtk_dialog_run (GTK_DIALOG (dialog));
  handle_page_setup_response (dialog, response, &rdata);
 
  if (rdata.page_setup)
    return rdata.page_setup;
  else if (page_setup)
    return gtk_page_setup_copy (page_setup);
  else
    return gtk_page_setup_new ();
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}

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/**
 * gtk_print_run_page_setup_dialog_async:
 * @parent: transient parent, or %NULL
 * @page_setup: an existing #GtkPageSetup, or %NULL
 * @settings: a #GtkPrintSettings
 * @done_cb: a function to call when the user saves the modified page setup
 * @data: user data to pass to @done_cb
 * 
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 * Runs a page setup dialog, letting the user modify the values from @page_setup. 
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 *
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 * In contrast to gtk_print_run_page_setup_dialog(), this function  returns after 
 * showing the page setup dialog on platforms that support this, and calls @done_cb 
 * from a signal handler for the ::response signal of the dialog.
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 *
 * Since: 2.10
 */
void
gtk_print_run_page_setup_dialog_async (GtkWindow            *parent,
				       GtkPageSetup         *page_setup,
				       GtkPrintSettings     *settings,
				       GtkPageSetupDoneFunc  done_cb,
				       gpointer              data)
{
  GtkWidget *dialog;
  PageSetupResponseData *rdata;
  
  dialog = get_page_setup_dialog (parent, page_setup, settings);
  gtk_window_set_modal (GTK_WINDOW (dialog), TRUE);
  
  rdata = g_new (PageSetupResponseData, 1);
  rdata->page_setup = NULL;
  rdata->done_cb = done_cb;
  rdata->data = data;
  rdata->destroy = page_setup_data_free;

  g_signal_connect (dialog, "response",
		    G_CALLBACK (handle_page_setup_response), rdata);
 
  gtk_window_present (GTK_WINDOW (dialog));
 }

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struct _PrinterFinder 
{
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  gboolean found_printer;
  GFunc func;
  gpointer data;
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  gchar *printer_name;
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  GList *backends;
  guint timeout_tag;
  GtkPrinter *printer;
  GtkPrinter *default_printer;
  GtkPrinter *first_printer;
};

static gboolean
find_printer_idle (gpointer data)
{
  PrinterFinder *finder = data;
  GtkPrinter *printer;

  if (finder->printer != NULL)
    printer = finder->printer;
  else if (finder->default_printer != NULL)
    printer = finder->default_printer;
  else if (finder->first_printer != NULL)
    printer = finder->first_printer;
  else
    printer = NULL;

  finder->func (printer, finder->data);
  
  printer_finder_free (finder);

  return FALSE;
}

static void
printer_added_cb (GtkPrintBackend *backend, 
                  GtkPrinter      *printer, 
		  PrinterFinder   *finder)
{
  if (gtk_printer_is_virtual (printer) ||
      finder->found_printer)
    return;

  if (finder->printer_name != NULL &&
      strcmp (gtk_printer_get_name (printer), finder->printer_name) == 0)
    {
      finder->printer = g_object_ref (printer);
      finder->found_printer = TRUE;
    }
  else if (finder->default_printer == NULL &&
	   gtk_printer_is_default (printer))
    {
      finder->default_printer = g_object_ref (printer);
      if (finder->printer_name == NULL)
	finder->found_printer = TRUE;
    }
  else
    if (finder->first_printer == NULL)
      finder->first_printer = g_object_ref (printer);
  
  if (finder->found_printer)
    g_idle_add (find_printer_idle, finder);
}

static void
printer_list_done_cb (GtkPrintBackend *backend, 
		      PrinterFinder   *finder)
{
  finder->backends = g_list_remove (finder->backends, backend);
  
  g_signal_handlers_disconnect_by_func (backend, printer_added_cb, finder);
  g_signal_handlers_disconnect_by_func (backend, printer_list_done_cb, finder);
  
  gtk_print_backend_destroy (backend);
  g_object_unref (backend);

  if (finder->backends == NULL && !finder->found_printer)
    g_idle_add (find_printer_idle, finder);
}

static void
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find_printer_init (PrinterFinder   *finder,
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		   GtkPrintBackend *backend)
{
  GList *list;
  GList *node;

  list = gtk_print_backend_get_printer_list (backend);

  node = list;
  while (node != NULL)
    {
      printer_added_cb (backend, node->data, finder);
      node = node->next;

      if (finder->found_printer)
	break;
    }

  g_list_free (list);

  if (gtk_print_backend_printer_list_is_done (backend))
    {
      finder->backends = g_list_remove (finder->backends, backend);
      gtk_print_backend_destroy (backend);
      g_object_unref (backend);
    }
  else
    {
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      g_signal_connect (backend, "printer-added", 
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			(GCallback) printer_added_cb, 
			finder);
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      g_signal_connect (backend, "printer-list-done", 
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			(GCallback) printer_list_done_cb, 
			finder);
    }

}

static void
printer_finder_free (PrinterFinder *finder)
{
  GList *l;
  
  g_free (finder->printer_name);
  
  if (finder->printer)
    g_object_unref (finder->printer);
  
  if (finder->default_printer)
    g_object_unref (finder->default_printer);
  
  if (finder->first_printer)
    g_object_unref (finder->first_printer);

  for (l = finder->backends; l != NULL; l = l->next)
    {
      GtkPrintBackend *backend = l->data;
      g_signal_handlers_disconnect_by_func (backend, printer_added_cb, finder);
      g_signal_handlers_disconnect_by_func (backend, printer_list_done_cb, finder);
      gtk_print_backend_destroy (backend);
      g_object_unref (backend);
    }
  
  g_list_free (finder->backends);
  
  g_free (finder);
}

static void 
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find_printer (const gchar *printer,
	      GFunc        func,
	      gpointer     data)
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{
  GList *node, *next;
  PrinterFinder *finder;

  finder = g_new0 (PrinterFinder, 1);

  finder->printer_name = g_strdup (printer);
  finder->func = func;
  finder->data = data;
  
  finder->backends = NULL;
  if (g_module_supported ())
    finder->backends = gtk_print_backend_load_modules ();

  for (node = finder->backends; !finder->found_printer && node != NULL; node = next)
    {
      next = node->next;
      find_printer_init (finder, GTK_PRINT_BACKEND (node->data));
    }

  if (finder->backends == NULL && !finder->found_printer)
    g_idle_add (find_printer_idle, finder);
}
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#define __GTK_PRINT_OPERATION_UNIX_C__
#include "gtkaliasdef.c"