printing/print_settings_initializer_gtk.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "printing/print_settings_initializer_gtk.h"
   6
   7 #include <gtk/gtk.h>
   8 #include <gtk/gtkunixprint.h>
   9
  10 #include "base/strings/string16.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "printing/print_settings.h"
  13 #include "printing/units.h"
  14
  15 namespace printing {
  16
  17 // static
  18 void PrintSettingsInitializerGtk::InitPrintSettings(
  19     GtkPrintSettings* settings,
  20     GtkPageSetup* page_setup,
  21     PrintSettings* print_settings) {
  22   DCHECK(settings);
  23   DCHECK(page_setup);
  24   DCHECK(print_settings);
  25
  26   base::string16 name(base::UTF8ToUTF16(static_cast<const char*>(
  27       gtk_print_settings_get_printer(settings))));
  28   print_settings->set_device_name(name);
  29
  30   gfx::Size physical_size_device_units;
  31   gfx::Rect printable_area_device_units;
  32   int dpi = gtk_print_settings_get_resolution(settings);
  33   if (dpi) {
  34     // Initialize page_setup_device_units_.
  35     physical_size_device_units.SetSize(
  36         gtk_page_setup_get_paper_width(page_setup, GTK_UNIT_INCH) * dpi,
  37         gtk_page_setup_get_paper_height(page_setup, GTK_UNIT_INCH) * dpi);
  38     printable_area_device_units.SetRect(
  39         gtk_page_setup_get_left_margin(page_setup, GTK_UNIT_INCH) * dpi,
  40         gtk_page_setup_get_top_margin(page_setup, GTK_UNIT_INCH) * dpi,
  41         gtk_page_setup_get_page_width(page_setup, GTK_UNIT_INCH) * dpi,
  42         gtk_page_setup_get_page_height(page_setup, GTK_UNIT_INCH) * dpi);
  43   } else {
  44     // Use default values if we cannot get valid values from the print dialog.
  45     dpi = kPixelsPerInch;
  46     double page_width_in_pixel = kLetterWidthInch * dpi;
  47     double page_height_in_pixel = kLetterHeightInch * dpi;
  48     physical_size_device_units.SetSize(
  49         static_cast<int>(page_width_in_pixel),
  50         static_cast<int>(page_height_in_pixel));
  51     printable_area_device_units.SetRect(
  52         static_cast<int>(kLeftMarginInInch * dpi),
  53         static_cast<int>(kTopMarginInInch * dpi),
  54         page_width_in_pixel - (kLeftMarginInInch + kRightMarginInInch) * dpi,
  55         page_height_in_pixel - (kTopMarginInInch + kBottomMarginInInch) * dpi);
  56   }
  57
  58   print_settings->set_dpi(dpi);
  59
  60   // Note: With the normal GTK print dialog, when the user selects the landscape
  61   // orientation, all that does is change the paper size. Which seems to be
  62   // enough to render the right output and send it to the printer.
  63   // The orientation value stays as portrait and does not actually affect
  64   // printing.
  65   // Thus this is only useful in print preview mode, where we manually set the
  66   // orientation and change the paper size ourselves.
  67   GtkPageOrientation orientation = gtk_print_settings_get_orientation(settings);
  68   // Set before SetPrinterPrintableArea to make it flip area if necessary.
  69   print_settings->SetOrientation(orientation == GTK_PAGE_ORIENTATION_LANDSCAPE);
  70   DCHECK_EQ(print_settings->device_units_per_inch(), dpi);
  71   print_settings->SetPrinterPrintableArea(physical_size_device_units,
  72                                           printable_area_device_units,
  73                                           true);
  74 }
  75
  76 const double PrintSettingsInitializerGtk::kTopMarginInInch = 0.25;
  77 const double PrintSettingsInitializerGtk::kBottomMarginInInch = 0.56;
  78 const double PrintSettingsInitializerGtk::kLeftMarginInInch = 0.25;
  79 const double PrintSettingsInitializerGtk::kRightMarginInInch = 0.25;
  80
  81 }  // namespace printing