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gtk/demos/print-editor/print-editor.c
Matthias Clasen 4248380538 print-editor: Port to async dialog API
2022-10-29 13:31:41 -04:00

915 lines
25 KiB
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#include <config.h>
#include <math.h>
#include <pango/pangocairo.h>
#include <glib/gi18n.h>
#include <gtk/gtk.h>
#include "demo_conf.h"
static GtkWidget *main_window;
static GFile *filename = NULL;
static GtkPageSetup *page_setup = NULL;
static GtkPrintSettings *settings = NULL;
static gboolean file_changed = FALSE;
static GtkTextBuffer *buffer;
static GtkWidget *statusbar;
static GList *active_prints = NULL;
static void
update_title (GtkWindow *window)
{
char *basename;
char *title;
if (filename == NULL)
basename = g_strdup ("Untitled");
else
basename = g_file_get_basename (filename);
title = g_strdup_printf ("GTK Print Editor — %s", basename);
g_free (basename);
gtk_window_set_title (window, title);
g_free (title);
}
static void
update_statusbar (void)
{
char *msg;
int row, col;
GtkTextIter iter;
const char *print_str;
gtk_statusbar_pop (GTK_STATUSBAR (statusbar), 0);
gtk_text_buffer_get_iter_at_mark (buffer,
&iter,
gtk_text_buffer_get_insert (buffer));
row = gtk_text_iter_get_line (&iter);
col = gtk_text_iter_get_line_offset (&iter);
print_str = "";
if (active_prints)
{
GtkPrintOperation *op = active_prints->data;
print_str = gtk_print_operation_get_status_string (op);
}
msg = g_strdup_printf ("%d, %d%s %s",
row, col,
file_changed?" - Modified":"",
print_str);
gtk_statusbar_push (GTK_STATUSBAR (statusbar), 0, msg);
g_free (msg);
}
static void
update_ui (void)
{
update_title (GTK_WINDOW (main_window));
update_statusbar ();
}
static char *
get_text (void)
{
GtkTextIter start, end;
gtk_text_buffer_get_start_iter (buffer, &start);
gtk_text_buffer_get_end_iter (buffer, &end);
return gtk_text_buffer_get_text (buffer, &start, &end, FALSE);
}
static void
set_text (const char *text,
gsize len)
{
gtk_text_buffer_set_text (buffer, text, len);
file_changed = FALSE;
update_ui ();
}
static void
load_file (GFile *open_filename)
{
char *contents;
GError *error;
gsize len;
error = NULL;
g_file_load_contents (open_filename, NULL, &contents, &len, NULL, &error);
if (error == NULL)
{
if (g_utf8_validate (contents, len, NULL))
{
g_clear_object (&filename);
filename = g_object_ref (open_filename);
set_text (contents, len);
g_free (contents);
}
else
{
GFileInfo *info = g_file_query_info (open_filename, "standard::display-name", 0, NULL, &error);
const char *display_name = g_file_info_get_display_name (info);
GtkAlertDialog *alert;
alert = gtk_alert_dialog_new ("Error loading file %s", display_name);
gtk_alert_dialog_set_detail (alert, "Not valid utf8");
gtk_alert_dialog_show (alert, GTK_WINDOW (main_window));
g_object_unref (alert);
g_object_unref (info);
}
}
else
{
GFileInfo *info = g_file_query_info (open_filename, "standard::display-name", 0, NULL, &error);
const char *display_name = g_file_info_get_display_name (info);
GtkAlertDialog *alert;
alert = gtk_alert_dialog_new ("Error loading file %s", display_name);
gtk_alert_dialog_set_detail (alert, error->message);
gtk_alert_dialog_show (alert, GTK_WINDOW (main_window));
g_object_unref (alert);
g_object_unref (info);
g_error_free (error);
}
}
static void
save_file (GFile *save_filename)
{
char *text = get_text ();
GError *error;
error = NULL;
g_file_replace_contents (save_filename,
text, strlen (text),
NULL, FALSE,
G_FILE_CREATE_NONE,
NULL,
NULL,
&error);
if (error == NULL)
{
if (save_filename != filename)
{
g_clear_object (&filename);
filename = g_object_ref (save_filename);
}
file_changed = FALSE;
update_ui ();
}
else
{
GFileInfo *info = g_file_query_info (save_filename, "standard::display-name", 0, NULL, NULL);
const char *display_name = g_file_info_get_display_name (info);
GtkAlertDialog *alert;
alert = gtk_alert_dialog_new ("Error saving to file %s", display_name);
gtk_alert_dialog_set_detail (alert, error->message);
gtk_alert_dialog_show (alert, GTK_WINDOW (main_window));
g_object_unref (alert);
g_error_free (error);
g_object_unref (info);
}
}
typedef struct {
char *text;
PangoLayout *layout;
GList *page_breaks;
GtkWidget *font_button;
char *font;
} PrintData;
static void
begin_print (GtkPrintOperation *operation,
GtkPrintContext *context,
PrintData *print_data)
{
PangoFontDescription *desc;
PangoLayoutLine *layout_line;
double width, height;
double page_height;
GList *page_breaks;
int num_lines;
int line;
width = gtk_print_context_get_width (context);
height = gtk_print_context_get_height (context);
print_data->layout = gtk_print_context_create_pango_layout (context);
desc = pango_font_description_from_string (print_data->font);
pango_layout_set_font_description (print_data->layout, desc);
pango_font_description_free (desc);
pango_layout_set_width (print_data->layout, width * PANGO_SCALE);
pango_layout_set_text (print_data->layout, print_data->text, -1);
num_lines = pango_layout_get_line_count (print_data->layout);
page_breaks = NULL;
page_height = 0;
for (line = 0; line < num_lines; line++)
{
PangoRectangle ink_rect, logical_rect;
double line_height;
layout_line = pango_layout_get_line (print_data->layout, line);
pango_layout_line_get_extents (layout_line, &ink_rect, &logical_rect);
line_height = logical_rect.height / 1024.0;
if (page_height + line_height > height)
{
page_breaks = g_list_prepend (page_breaks, GINT_TO_POINTER (line));
page_height = 0;
}
page_height += line_height;
}
page_breaks = g_list_reverse (page_breaks);
gtk_print_operation_set_n_pages (operation, g_list_length (page_breaks) + 1);
print_data->page_breaks = page_breaks;
}
static void
draw_page (GtkPrintOperation *operation,
GtkPrintContext *context,
int page_nr,
PrintData *print_data)
{
cairo_t *cr;
GList *pagebreak;
int start, end, i;
PangoLayoutIter *iter;
double start_pos;
if (page_nr == 0)
start = 0;
else
{
pagebreak = g_list_nth (print_data->page_breaks, page_nr - 1);
start = GPOINTER_TO_INT (pagebreak->data);
}
pagebreak = g_list_nth (print_data->page_breaks, page_nr);
if (pagebreak == NULL)
end = pango_layout_get_line_count (print_data->layout);
else
end = GPOINTER_TO_INT (pagebreak->data);
cr = gtk_print_context_get_cairo_context (context);
cairo_set_source_rgb (cr, 0, 0, 0);
i = 0;
start_pos = 0;
iter = pango_layout_get_iter (print_data->layout);
do
{
PangoRectangle logical_rect;
PangoLayoutLine *line;
int baseline;
if (i >= start)
{
line = pango_layout_iter_get_line (iter);
pango_layout_iter_get_line_extents (iter, NULL, &logical_rect);
baseline = pango_layout_iter_get_baseline (iter);
if (i == start)
start_pos = logical_rect.y / 1024.0;
cairo_move_to (cr, logical_rect.x / 1024.0, baseline / 1024.0 - start_pos);
pango_cairo_show_layout_line (cr, line);
}
i++;
}
while (i < end &&
pango_layout_iter_next_line (iter));
pango_layout_iter_free (iter);
}
static void
status_changed_cb (GtkPrintOperation *op,
gpointer user_data)
{
if (gtk_print_operation_is_finished (op))
{
active_prints = g_list_remove (active_prints, op);
g_object_unref (op);
}
update_statusbar ();
}
static GtkWidget *
create_custom_widget (GtkPrintOperation *operation,
PrintData *data)
{
GtkWidget *vbox, *hbox, *font, *label;
GtkFontDialog *dialog;
PangoFontDescription *desc;
gtk_print_operation_set_custom_tab_label (operation, "Other");
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 8);
gtk_box_append (GTK_BOX (vbox), hbox);
label = gtk_label_new ("Font:");
gtk_box_append (GTK_BOX (hbox), label);
dialog = gtk_font_dialog_new ();
font = gtk_font_dialog_button_new (dialog);
desc = pango_font_description_from_string (data->font);
gtk_font_dialog_button_set_font_desc (GTK_FONT_DIALOG_BUTTON (font), desc);
pango_font_description_free (desc);
gtk_box_append (GTK_BOX (hbox), font);
data->font_button = font;
return vbox;
}
static void
custom_widget_apply (GtkPrintOperation *operation,
GtkWidget *widget,
PrintData *data)
{
PangoFontDescription *desc;
desc = gtk_font_dialog_button_get_font_desc (GTK_FONT_DIALOG_BUTTON (data->font_button));
g_free (data->font);
data->font = pango_font_description_to_string (desc);
}
static void
print_done (GtkPrintOperation *op,
GtkPrintOperationResult res,
PrintData *print_data)
{
if (res == GTK_PRINT_OPERATION_RESULT_ERROR)
{
GtkAlertDialog *alert;
GError *error = NULL;
gtk_print_operation_get_error (op, &error);
alert = gtk_alert_dialog_new ("Error printing file");
if (error)
gtk_alert_dialog_set_detail (alert, error->message);
gtk_alert_dialog_show (alert, GTK_WINDOW (main_window));
g_object_unref (alert);
}
else if (res == GTK_PRINT_OPERATION_RESULT_APPLY)
{
if (settings != NULL)
g_object_unref (settings);
settings = g_object_ref (gtk_print_operation_get_print_settings (op));
}
g_free (print_data->text);
g_free (print_data->font);
g_free (print_data);
if (!gtk_print_operation_is_finished (op))
{
g_object_ref (op);
active_prints = g_list_append (active_prints, op);
update_statusbar ();
/* This ref is unref:ed when we get the final state change */
g_signal_connect (op, "status_changed",
G_CALLBACK (status_changed_cb), NULL);
}
}
static void
end_print (GtkPrintOperation *op, GtkPrintContext *context, PrintData *print_data)
{
g_list_free (print_data->page_breaks);
print_data->page_breaks = NULL;
g_object_unref (print_data->layout);
print_data->layout = NULL;
}
static void
print_or_preview (GSimpleAction *action, GtkPrintOperationAction print_action)
{
GtkPrintOperation *print;
PrintData *print_data;
print_data = g_new0 (PrintData, 1);
print_data->text = get_text ();
print_data->font = g_strdup ("Sans 12");
print = gtk_print_operation_new ();
gtk_print_operation_set_track_print_status (print, TRUE);
if (settings != NULL)
gtk_print_operation_set_print_settings (print, settings);
if (page_setup != NULL)
gtk_print_operation_set_default_page_setup (print, page_setup);
g_signal_connect (print, "begin_print", G_CALLBACK (begin_print), print_data);
g_signal_connect (print, "end-print", G_CALLBACK (end_print), print_data);
g_signal_connect (print, "draw_page", G_CALLBACK (draw_page), print_data);
g_signal_connect (print, "create_custom_widget", G_CALLBACK (create_custom_widget), print_data);
g_signal_connect (print, "custom_widget_apply", G_CALLBACK (custom_widget_apply), print_data);
g_signal_connect (print, "done", G_CALLBACK (print_done), print_data);
gtk_print_operation_set_export_filename (print, "test.pdf");
#if 0
gtk_print_operation_set_allow_async (print, TRUE);
#endif
gtk_print_operation_run (print, print_action, GTK_WINDOW (main_window), NULL);
g_object_unref (print);
}
static void
activate_page_setup (GSimpleAction *action,
GVariant *parameter,
gpointer user_data)
{
GtkPageSetup *new_page_setup;
new_page_setup = gtk_print_run_page_setup_dialog (GTK_WINDOW (main_window),
page_setup, settings);
if (page_setup)
g_object_unref (page_setup);
page_setup = new_page_setup;
}
static void
activate_print (GSimpleAction *action,
GVariant *parameter,
gpointer user_data)
{
print_or_preview (action, GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG);
}
static void
activate_preview (GSimpleAction *action,
GVariant *parameter,
gpointer user_data)
{
print_or_preview (action, GTK_PRINT_OPERATION_ACTION_PREVIEW);
}
static void
on_save_response (GObject *source,
GAsyncResult *result,
void *user_data)
{
GtkFileDialog *dialog = GTK_FILE_DIALOG (source);
GFile *file;
file = gtk_file_dialog_save_finish (dialog, result, NULL);
if (file)
{
save_file (file);
g_object_unref (file);
}
}
static void
activate_save_as (GSimpleAction *action,
GVariant *parameter,
gpointer user_data)
{
GtkFileDialog *dialog;
dialog = gtk_file_dialog_new ();
gtk_file_dialog_set_title (dialog, "Select file");
gtk_file_dialog_save (dialog,
GTK_WINDOW (main_window),
NULL,
NULL,
NULL,
on_save_response, NULL);
g_object_unref (dialog);
}
static void
activate_save (GSimpleAction *action,
GVariant *parameter,
gpointer user_data)
{
if (filename == NULL)
activate_save_as (action, NULL, NULL);
else
save_file (filename);
}
static void
on_open_response (GObject *source,
GAsyncResult *result,
void *user_data)
{
GtkFileDialog *dialog = GTK_FILE_DIALOG (source);
GFile *file;
file = gtk_file_dialog_open_finish (dialog, result, NULL);
if (file)
{
load_file (file);
g_object_unref (file);
}
}
static void
activate_open (GSimpleAction *action,
GVariant *parameter,
gpointer user_data)
{
GtkFileDialog *dialog;
dialog = gtk_file_dialog_new ();
gtk_file_dialog_set_title (dialog, "Select file");
gtk_file_dialog_open (dialog,
GTK_WINDOW (main_window),
NULL,
NULL,
on_open_response, NULL);
g_object_unref (dialog);
}
static void
activate_new (GSimpleAction *action,
GVariant *parameter,
gpointer user_data)
{
g_clear_object (&filename);
set_text ("", 0);
}
static void
activate_about (GSimpleAction *action,
GVariant *parameter,
gpointer user_data)
{
char *version;
GString *sysinfo;
char *setting;
char **backends;
int i;
char *os_name;
char *os_version;
const char *authors[] = {
"Alexander Larsson",
NULL
};
const char *artists[] = {
"Jakub Steiner",
NULL
};
const char *maintainers[] = {
"The GTK Team",
NULL
};
GtkWidget *dialog;
os_name = g_get_os_info (G_OS_INFO_KEY_NAME);
os_version = g_get_os_info (G_OS_INFO_KEY_VERSION_ID);
sysinfo = g_string_new ("");
if (os_name && os_version)
g_string_append_printf (sysinfo, "OS\t%s %s\n\n", os_name, os_version);
g_string_append (sysinfo, "System libraries\n");
g_string_append_printf (sysinfo, "\tGLib\t%d.%d.%d\n",
glib_major_version,
glib_minor_version,
glib_micro_version);
g_string_append_printf (sysinfo, "\tPango\t%s\n",
pango_version_string ());
g_string_append_printf (sysinfo, "\tGTK \t%d.%d.%d\n",
gtk_get_major_version (),
gtk_get_minor_version (),
gtk_get_micro_version ());
g_string_append (sysinfo, "\nPrint backends\n");
g_object_get (gtk_settings_get_default (), "gtk-print-backends", &setting, NULL);
backends = g_strsplit (setting, ",", -1);
g_string_append (sysinfo, "\t");
for (i = 0; backends[i]; i++)
g_string_append_printf (sysinfo, "%s ", backends[i]);
g_strfreev (backends);
g_free (setting);
version = g_strdup_printf ("%s%s%s\nRunning against GTK %d.%d.%d",
PACKAGE_VERSION,
g_strcmp0 (PROFILE, "devel") == 0 ? "-" : "",
g_strcmp0 (PROFILE, "devel") == 0 ? VCS_TAG : "",
gtk_get_major_version (),
gtk_get_minor_version (),
gtk_get_micro_version ());
dialog = g_object_new (GTK_TYPE_ABOUT_DIALOG,
"transient-for", main_window,
"program-name", g_strcmp0 (PROFILE, "devel") == 0
? "GTK Print Editor (Development)"
: "GTK Print Editor",
"version", version,
"copyright", "© 2006-2021 Red Hat, Inc",
"license-type", GTK_LICENSE_LGPL_2_1,
"website", "http://www.gtk.org",
"comments", "Program to demonstrate GTK printing",
"authors", authors,
"logo-icon-name", "org.gtk.PrintEditor4",
"title", "About GTK Print Editor",
"system-information", sysinfo->str,
NULL);
gtk_about_dialog_add_credit_section (GTK_ABOUT_DIALOG (dialog),
_("Artwork by"), artists);
gtk_about_dialog_add_credit_section (GTK_ABOUT_DIALOG (dialog),
_("Maintained by"), maintainers);
gtk_window_present (GTK_WINDOW (dialog));
g_string_free (sysinfo, TRUE);
g_free (version);
g_free (os_name);
g_free (os_version);
}
static void
activate_quit (GSimpleAction *action,
GVariant *parameter,
gpointer user_data)
{
GtkApplication *app = user_data;
GtkWidget *win;
GList *list, *next;
list = gtk_application_get_windows (app);
while (list)
{
win = list->data;
next = list->next;
gtk_window_destroy (GTK_WINDOW (win));
list = next;
}
}
static GActionEntry app_entries[] = {
{ "new", activate_new, NULL, NULL, NULL },
{ "open", activate_open, NULL, NULL, NULL },
{ "save", activate_save, NULL, NULL, NULL },
{ "save-as", activate_save_as, NULL, NULL, NULL },
{ "quit", activate_quit, NULL, NULL, NULL },
{ "about", activate_about, NULL, NULL, NULL },
{ "page-setup", activate_page_setup, NULL, NULL, NULL },
{ "preview", activate_preview, NULL, NULL, NULL },
{ "print", activate_print, NULL, NULL, NULL }
};
static const char ui_info[] =
"<interface>"
" <menu id='menubar'>"
" <submenu>"
" <attribute name='label'>_File</attribute>"
" <section>"
" <item>"
" <attribute name='label'>_New</attribute>"
" <attribute name='action'>app.new</attribute>"
" </item>"
" <item>"
" <attribute name='label'>_Open</attribute>"
" <attribute name='action'>app.open</attribute>"
" </item>"
" <item>"
" <attribute name='label'>_Save</attribute>"
" <attribute name='action'>app.save</attribute>"
" </item>"
" <item>"
" <attribute name='label'>Save _As...</attribute>"
" <attribute name='action'>app.save-as</attribute>"
" </item>"
" </section>"
" <section>"
" <item>"
" <attribute name='label'>Page Setup</attribute>"
" <attribute name='action'>app.page-setup</attribute>"
" </item>"
" <item>"
" <attribute name='label'>Preview</attribute>"
" <attribute name='action'>app.preview</attribute>"
" </item>"
" <item>"
" <attribute name='label'>Print</attribute>"
" <attribute name='action'>app.print</attribute>"
" </item>"
" </section>"
" <section>"
" <item>"
" <attribute name='label'>_Quit</attribute>"
" <attribute name='action'>app.quit</attribute>"
" </item>"
" </section>"
" </submenu>"
" <submenu>"
" <attribute name='label'>_Help</attribute>"
" <section>"
" <item>"
" <attribute name='label'>_About Print Editor</attribute>"
" <attribute name='action'>app.about</attribute>"
" </item>"
" </section>"
" </submenu>"
" </menu>"
"</interface>";
static void
buffer_changed_callback (GtkTextBuffer *text_buffer)
{
file_changed = TRUE;
update_statusbar ();
}
static void
mark_set_callback (GtkTextBuffer *text_buffer,
const GtkTextIter *new_location,
GtkTextMark *mark,
gpointer data)
{
update_statusbar ();
}
static void
startup (GApplication *app)
{
GtkBuilder *builder;
GMenuModel *menubar;
struct {
const char *action_and_target;
const char *accelerators[2];
} accels[] = {
{ "app.new", { "<Control>n", NULL } },
{ "app.quit", { "<Control>q", NULL } },
{ "app.save", { "<Control>s", NULL } },
{ "app.about", { "<Control>a", NULL } },
};
builder = gtk_builder_new ();
gtk_builder_add_from_string (builder, ui_info, -1, NULL);
menubar = (GMenuModel *)gtk_builder_get_object (builder, "menubar");
gtk_application_set_menubar (GTK_APPLICATION (app), menubar);
for (int i = 0; i < G_N_ELEMENTS (accels); i++)
gtk_application_set_accels_for_action (GTK_APPLICATION (app), accels[i].action_and_target, accels[i].accelerators);
g_object_unref (builder);
}
static void
activate (GApplication *app)
{
GtkWidget *box;
GtkWidget *sw;
GtkWidget *contents;
main_window = gtk_application_window_new (GTK_APPLICATION (app));
if (g_strcmp0 (PROFILE, "devel") == 0)
gtk_widget_add_css_class (GTK_WIDGET (main_window), "devel");
gtk_window_set_icon_name (GTK_WINDOW (main_window), "text-editor");
gtk_window_set_default_size (GTK_WINDOW (main_window), 400, 600);
gtk_application_window_set_show_menubar (GTK_APPLICATION_WINDOW (main_window), TRUE);
update_title (GTK_WINDOW (main_window));
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_window_set_child (GTK_WINDOW (main_window), box);
/* Create document */
sw = gtk_scrolled_window_new ();
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
GTK_POLICY_AUTOMATIC,
GTK_POLICY_AUTOMATIC);
gtk_scrolled_window_set_has_frame (GTK_SCROLLED_WINDOW (sw), TRUE);
gtk_widget_set_vexpand (sw, TRUE);
gtk_box_append (GTK_BOX (box), sw);
contents = gtk_text_view_new ();
gtk_widget_grab_focus (contents);
gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw),
contents);
/* Create statusbar */
statusbar = gtk_statusbar_new ();
gtk_box_append (GTK_BOX (box), statusbar);
/* Show text widget info in the statusbar */
buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (contents));
g_signal_connect_object (buffer,
"changed",
G_CALLBACK (buffer_changed_callback),
NULL,
0);
g_signal_connect_object (buffer,
"mark_set", /* cursor moved */
G_CALLBACK (mark_set_callback),
NULL,
0);
update_ui ();
gtk_window_present (GTK_WINDOW (main_window));
}
static void
open (GApplication *application,
GFile **files,
int n_files,
const char *hint)
{
if (n_files > 1)
g_warning ("Can only open a single file");
activate (application);
load_file (files[0]);
}
int
main (int argc, char **argv)
{
GtkApplication *app;
GError *error = NULL;
gtk_init ();
settings = gtk_print_settings_new_from_file ("print-settings.ini", &error);
if (error) {
g_print ("Failed to load print settings: %s\n", error->message);
g_clear_error (&error);
settings = gtk_print_settings_new ();
}
g_assert (settings != NULL);
page_setup = gtk_page_setup_new_from_file ("page-setup.ini", &error);
if (error) {
g_print ("Failed to load page setup: %s\n", error->message);
g_clear_error (&error);
}
app = gtk_application_new ("org.gtk.PrintEditor4", G_APPLICATION_HANDLES_OPEN);
g_action_map_add_action_entries (G_ACTION_MAP (app),
app_entries, G_N_ELEMENTS (app_entries),
app);
g_signal_connect (app, "startup", G_CALLBACK (startup), NULL);
g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
g_signal_connect (app, "open", G_CALLBACK (open), NULL);
g_application_run (G_APPLICATION (app), argc, argv);
if (!gtk_print_settings_to_file (settings, "print-settings.ini", &error)) {
g_print ("Failed to save print settings: %s\n", error->message);
g_clear_error (&error);
}
if (page_setup &&
!gtk_page_setup_to_file (page_setup, "page-setup.ini", &error)) {
g_print ("Failed to save page setup: %s\n", error->message);
g_clear_error (&error);
}
return 0;
}
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