GtkPrintOperation

GtkPrintOperation — High-level Printing API

Synopsis


#include <gtk/gtk.h>


                    GtkPrintOperation;
enum                GtkPrintStatus;
enum                GtkPrintOperationAction;
enum                GtkPrintOperationResult;
enum                GtkPrintError;
#define             GTK_PRINT_ERROR
GtkPrintOperation*  gtk_print_operation_new             (void);
void                gtk_print_operation_set_allow_async (GtkPrintOperation *op,
                                                         gboolean allow_async);
void                gtk_print_operation_get_error       (GtkPrintOperation *op,
                                                         GError **error);
void                gtk_print_operation_set_default_page_setup
                                                        (GtkPrintOperation *op,
                                                         GtkPageSetup *default_page_setup);
GtkPageSetup*       gtk_print_operation_get_default_page_setup
                                                        (GtkPrintOperation *op);
void                gtk_print_operation_set_print_settings
                                                        (GtkPrintOperation *op,
                                                         GtkPrintSettings *print_settings);
GtkPrintSettings*   gtk_print_operation_get_print_settings
                                                        (GtkPrintOperation *op);
void                gtk_print_operation_set_job_name    (GtkPrintOperation *op,
                                                         const gchar *job_name);
void                gtk_print_operation_set_n_pages     (GtkPrintOperation *op,
                                                         gint n_pages);
void                gtk_print_operation_set_current_page
                                                        (GtkPrintOperation *op,
                                                         gint current_page);
void                gtk_print_operation_set_use_full_page
                                                        (GtkPrintOperation *op,
                                                         gboolean full_page);
void                gtk_print_operation_set_unit        (GtkPrintOperation *op,
                                                         GtkUnit unit);
void                gtk_print_operation_set_export_filename
                                                        (GtkPrintOperation *op,
                                                         const gchar *filename);
void                gtk_print_operation_set_show_progress
                                                        (GtkPrintOperation *op,
                                                         gboolean show_progress);
void                gtk_print_operation_set_track_print_status
                                                        (GtkPrintOperation *op,
                                                         gboolean track_status);
void                gtk_print_operation_set_custom_tab_label
                                                        (GtkPrintOperation *op,
                                                         const gchar *label);
GtkPrintOperationResult gtk_print_operation_run         (GtkPrintOperation *op,
                                                         GtkPrintOperationAction action,
                                                         GtkWindow *parent,
                                                         GError **error);
void                gtk_print_operation_cancel          (GtkPrintOperation *op);
GtkPrintStatus      gtk_print_operation_get_status      (GtkPrintOperation *op);
const gchar*        gtk_print_operation_get_status_string
                                                        (GtkPrintOperation *op);
gboolean            gtk_print_operation_is_finished     (GtkPrintOperation *op);
GtkPageSetup*       gtk_print_run_page_setup_dialog     (GtkWindow *parent,
                                                         GtkPageSetup *page_setup,
                                                         GtkPrintSettings *settings);
void                (*GtkPageSetupDoneFunc)             (GtkPageSetup *page_setup,
                                                         gpointer data);
void                gtk_print_run_page_setup_dialog_async
                                                        (GtkWindow *parent,
                                                         GtkPageSetup *page_setup,
                                                         GtkPrintSettings *settings,
                                                         GtkPageSetupDoneFunc done_cb,
                                                         gpointer data);

                    GtkPrintOperationPreview;
void                gtk_print_operation_preview_end_preview
                                                        (GtkPrintOperationPreview *preview);
gboolean            gtk_print_operation_preview_is_selected
                                                        (GtkPrintOperationPreview *preview,
                                                         gint page_nr);
void                gtk_print_operation_preview_render_page
                                                        (GtkPrintOperationPreview *preview,
                                                         gint page_nr);


Object Hierarchy


  GObject
   +----GtkPrintOperation

  GInterface
   +----GtkPrintOperationPreview

Prerequisites

GtkPrintOperationPreview requires GObject.

Implemented Interfaces

GtkPrintOperation implements GtkPrintOperationPreview.

Known Implementations

GtkPrintOperationPreview is implemented by GtkPrintOperation.

Properties


  "allow-async"              gboolean              : Read / Write
  "current-page"             gint                  : Read / Write
  "custom-tab-label"         gchararray            : Read / Write
  "default-page-setup"       GtkPageSetup          : Read / Write
  "export-filename"          gchararray            : Read / Write
  "job-name"                 gchararray            : Read / Write
  "n-pages"                  gint                  : Read / Write
  "print-settings"           GtkPrintSettings      : Read / Write
  "show-progress"            gboolean              : Read / Write
  "status"                   GtkPrintStatus        : Read
  "status-string"            gchararray            : Read
  "track-print-status"       gboolean              : Read / Write
  "unit"                     GtkUnit               : Read / Write
  "use-full-page"            gboolean              : Read / Write

Signals


  "begin-print"                                    : Run Last
  "create-custom-widget"                           : Run Last
  "custom-widget-apply"                            : Run Last
  "done"                                           : Run Last
  "draw-page"                                      : Run Last
  "end-print"                                      : Run Last
  "paginate"                                       : Run Last
  "preview"                                        : Run Last
  "request-page-setup"                             : Run Last
  "status-changed"                                 : Run Last

Description

GtkPrintOperation is the high-level, portable printing API. It looks a bit different than other GTK+ dialogs such as the GtkFileChooser, since some platforms don't expose enough infrastructure to implement a good print dialog. On such platforms, GtkPrintOperation uses the native print dialog. On platforms which do not provide a native print dialog, GTK+ uses its own, see GtkPrintUnixDialog.

The typical way to use the high-level printing API is to create a GtkPrintOperation object with gtk_print_operation_new() when the user selects to print. Then you set some properties on it, e.g. the page size, any GtkPrintSettings from previous print operations, the number of pages, the current page, etc.

Then you start the print operation by calling gtk_print_operation_run(). It will then show a dialog, let the user select a printer and options. When the user finished the dialog various signals will be emitted on the GtkPrintOperation, the main one being ::draw-page, which you are supposed to catch and render the page on the provided GtkPrintContext using Cairo.

Example 39. The high-level printing API

static GtkPrintSettings *settings = NULL;

static void
do_print (void)
{
  GtkPrintOperation *print;
  GtkPrintOperationResult res;

  print = gtk_print_operation_new ();

  if (settings != NULL) 
    gtk_print_operation_set_print_settings (print, settings);

  g_signal_connect (print, "begin_print", G_CALLBACK (begin_print), NULL);
  g_signal_connect (print, "draw_page", G_CALLBACK (draw_page), NULL);

  res = gtk_print_operation_run (print, GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG,
                                 GTK_WINDOW (main_window), NULL);

  if (res == GTK_PRINT_OPERATION_RESULT_APPLY)
    {
      if (settings != NULL)
        g_object_unref (settings);
      settings = g_object_ref (gtk_print_operation_get_print_settings (print));
    }

  g_object_unref (print);
}


By default GtkPrintOperation uses an external application to do print preview. To implement a custom print preview, an application must connect to the preview signal. The functions gtk_print_operation_print_preview_render_page(), gtk_print_operation_preview_end_preview() and gtk_print_operation_preview_is_selected() are useful when implementing a print preview.

Printing support was added in GTK+ 2.10.

Details

GtkPrintOperation

typedef struct _GtkPrintOperation GtkPrintOperation;


enum GtkPrintStatus

typedef enum {
  GTK_PRINT_STATUS_INITIAL,
  GTK_PRINT_STATUS_PREPARING,
  GTK_PRINT_STATUS_GENERATING_DATA,
  GTK_PRINT_STATUS_SENDING_DATA,
  GTK_PRINT_STATUS_PENDING,
  GTK_PRINT_STATUS_PENDING_ISSUE,
  GTK_PRINT_STATUS_PRINTING,
  GTK_PRINT_STATUS_FINISHED,
  GTK_PRINT_STATUS_FINISHED_ABORTED
} GtkPrintStatus;

The status gives a rough indication of the completion of a running print operation.

GTK_PRINT_STATUS_INITIAL

The printing has not started yet; this status is set initially, and while the print dialog is shown.

GTK_PRINT_STATUS_PREPARING

This status is set while the begin-print signal is emitted and during pagination.

GTK_PRINT_STATUS_GENERATING_DATA

This status is set while the pages are being rendered.

GTK_PRINT_STATUS_SENDING_DATA

The print job is being sent off to the printer.

GTK_PRINT_STATUS_PENDING

The print job has been sent to the printer, but is not printed for some reason, e.g. the printer may be stopped.

GTK_PRINT_STATUS_PENDING_ISSUE

Some problem has occurred during printing, e.g. a paper jam.

GTK_PRINT_STATUS_PRINTING

The printer is processing the print job.

GTK_PRINT_STATUS_FINISHED

The printing has been completed successfully.

GTK_PRINT_STATUS_FINISHED_ABORTED

The printing has been aborted.

enum GtkPrintOperationAction

typedef enum {
  GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG,
  GTK_PRINT_OPERATION_ACTION_PRINT,
  GTK_PRINT_OPERATION_ACTION_PREVIEW,
  GTK_PRINT_OPERATION_ACTION_EXPORT
} GtkPrintOperationAction;

The action parameter to gtk_print_operation_run() determines what action the print operation should perform.

GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG

Show the print dialog.

GTK_PRINT_OPERATION_ACTION_PRINT

Start to print without showing the print dialog, based on the current print settings.

GTK_PRINT_OPERATION_ACTION_PREVIEW

Show the print preview.

GTK_PRINT_OPERATION_ACTION_EXPORT

Export to a file. This requires the export-filename property to be set.

enum GtkPrintOperationResult

typedef enum {
  GTK_PRINT_OPERATION_RESULT_ERROR,
  GTK_PRINT_OPERATION_RESULT_APPLY,
  GTK_PRINT_OPERATION_RESULT_CANCEL,
  GTK_PRINT_OPERATION_RESULT_IN_PROGRESS
} GtkPrintOperationResult;

A value of this type is returned by gtk_print_operation_run().

GTK_PRINT_OPERATION_RESULT_ERROR

An error has occured.

GTK_PRINT_OPERATION_RESULT_APPLY

The print settings should be stored.

GTK_PRINT_OPERATION_RESULT_CANCEL

The print operation has been canceled, the print settings should not be stored.

GTK_PRINT_OPERATION_RESULT_IN_PROGRESS

The print operation is complete yet. This value will only be returned when running asynchronously.

enum GtkPrintError

typedef enum
{
  GTK_PRINT_ERROR_GENERAL,
  GTK_PRINT_ERROR_INTERNAL_ERROR,
  GTK_PRINT_ERROR_NOMEM,
  GTK_PRINT_ERROR_INVALID_FILE
} GtkPrintError;


GTK_PRINT_ERROR

#define GTK_PRINT_ERROR gtk_print_error_quark ()

The GQuark used for GtkPrintError errors.


gtk_print_operation_new ()

GtkPrintOperation*  gtk_print_operation_new             (void);

Creates a new GtkPrintOperation.

Returns :

a new GtkPrintOperation

Since 2.10


gtk_print_operation_set_allow_async ()

void                gtk_print_operation_set_allow_async (GtkPrintOperation *op,
                                                         gboolean allow_async);

Sets whether the gtk_print_operation_run() may return before the print operation is completed. Note that some platforms may not allow asynchronous operation.

op :

a GtkPrintOperation

allow_async :

TRUE to allow asynchronous operation

Since 2.10


gtk_print_operation_get_error ()

void                gtk_print_operation_get_error       (GtkPrintOperation *op,
                                                         GError **error);

Call this when the result of a print operation is GTK_PRINT_OPERATION_RESULT_ERROR, either as returned by gtk_print_operation_run(), or in the "done" signal handler. The returned GError will contain more details on what went wrong.

op :

a GtkPrintOperation

error :

return location for the error

Since 2.10


gtk_print_operation_set_default_page_setup ()

void                gtk_print_operation_set_default_page_setup
                                                        (GtkPrintOperation *op,
                                                         GtkPageSetup *default_page_setup);

Makes default_page_setup the default page setup for op.

This page setup will be used by gtk_print_operation_run(), but it can be overridden on a per-page basis by connecting to the "request-page-setup" signal.

op :

a GtkPrintOperation

default_page_setup :

a GtkPageSetup, or NULL

Since 2.10


gtk_print_operation_get_default_page_setup ()

GtkPageSetup*       gtk_print_operation_get_default_page_setup
                                                        (GtkPrintOperation *op);

Returns the default page setup, see gtk_print_operation_set_default_page_setup().

op :

a GtkPrintOperation

Returns :

the default page setup

Since 2.10


gtk_print_operation_set_print_settings ()

void                gtk_print_operation_set_print_settings
                                                        (GtkPrintOperation *op,
                                                         GtkPrintSettings *print_settings);

Sets the print settings for op. This is typically used to re-establish print settings from a previous print operation, see gtk_print_operation_run().

op :

a GtkPrintOperation

print_settings :

GtkPrintSettings, or NULL

Since 2.10


gtk_print_operation_get_print_settings ()

GtkPrintSettings*   gtk_print_operation_get_print_settings
                                                        (GtkPrintOperation *op);

Returns the current print settings.

Note that the return value is NULL until either gtk_print_operation_set_print_settings() or gtk_print_operation_run() have been called.

op :

a GtkPrintOperation

Returns :

the current print settings of op.

Since 2.10


gtk_print_operation_set_job_name ()

void                gtk_print_operation_set_job_name    (GtkPrintOperation *op,
                                                         const gchar *job_name);

Sets the name of the print job. The name is used to identify the job (e.g. in monitoring applications like eggcups).

If you don't set a job name, GTK+ picks a default one by numbering successive print jobs.

op :

a GtkPrintOperation

job_name :

a string that identifies the print job

Since 2.10


gtk_print_operation_set_n_pages ()

void                gtk_print_operation_set_n_pages     (GtkPrintOperation *op,
                                                         gint n_pages);

Sets the number of pages in the document.

This must be set to a positive number before the rendering starts. It may be set in a "begin-print" signal hander.

Note that the page numbers passed to the "request-page-setup" and "draw-page" signals are 0-based, i.e. if the user chooses to print all pages, the last ::draw-page signal will be for page n_pages - 1.

op :

a GtkPrintOperation

n_pages :

the number of pages

Since 2.10


gtk_print_operation_set_current_page ()

void                gtk_print_operation_set_current_page
                                                        (GtkPrintOperation *op,
                                                         gint current_page);

Sets the current page.

If this is called before gtk_print_operation_run(), the user will be able to select to print only the current page.

Note that this only makes sense for pre-paginated documents.

op :

a GtkPrintOperation

current_page :

the current page, 0-based

Since 2.10


gtk_print_operation_set_use_full_page ()

void                gtk_print_operation_set_use_full_page
                                                        (GtkPrintOperation *op,
                                                         gboolean full_page);

If full_page is TRUE, the transformation for the cairo context obtained from GtkPrintContext puts the origin at the top left corner of the page (which may not be the top left corner of the sheet, depending on page orientation and the number of pages per sheet). Otherwise, the origin is at the top left corner of the imageable area (i.e. inside the margins).

op :

a GtkPrintOperation

full_page :

TRUE to set up the GtkPrintContext for the full page

Since 2.10


gtk_print_operation_set_unit ()

void                gtk_print_operation_set_unit        (GtkPrintOperation *op,
                                                         GtkUnit unit);

Sets up the transformation for the cairo context obtained from GtkPrintContext in such a way that distances are measured in units of unit.

op :

a GtkPrintOperation

unit :

the unit to use

Since 2.10


gtk_print_operation_set_export_filename ()

void                gtk_print_operation_set_export_filename
                                                        (GtkPrintOperation *op,
                                                         const gchar *filename);

Sets up the GtkPrintOperation to generate a file instead of showing the print dialog. The indended use of this function is for implementing "Export to PDF" actions. Currently, PDF is the only supported format.

"Print to PDF" support is independent of this and is done by letting the user pick the "Print to PDF" item from the list of printers in the print dialog.

op :

a GtkPrintOperation

filename :

the filename for the exported file

Since 2.10


gtk_print_operation_set_show_progress ()

void                gtk_print_operation_set_show_progress
                                                        (GtkPrintOperation *op,
                                                         gboolean show_progress);

If show_progress is TRUE, the print operation will show a progress dialog during the print operation.

op :

a GtkPrintOperation

show_progress :

TRUE to show a progress dialog

Since 2.10


gtk_print_operation_set_track_print_status ()

void                gtk_print_operation_set_track_print_status
                                                        (GtkPrintOperation *op,
                                                         gboolean track_status);

If track_status is TRUE, the print operation will try to continue report on the status of the print job in the printer queues and printer. This can allow your application to show things like "out of paper" issues, and when the print job actually reaches the printer.

This function is often implemented using some form of polling, so it should not be enabled unless needed.

op :

a GtkPrintOperation

track_status :

TRUE to track status after printing

Since 2.10


gtk_print_operation_set_custom_tab_label ()

void                gtk_print_operation_set_custom_tab_label
                                                        (GtkPrintOperation *op,
                                                         const gchar *label);

Sets the label for the tab holding custom widgets.

op :

a GtkPrintOperation

label :

the label to use, or NULL to use the default label

Since 2.10


gtk_print_operation_run ()

GtkPrintOperationResult gtk_print_operation_run         (GtkPrintOperation *op,
                                                         GtkPrintOperationAction action,
                                                         GtkWindow *parent,
                                                         GError **error);

Runs the print operation, by first letting the user modify print settings in the print dialog, and then print the document.

Normally that this function does not return until the rendering of all pages is complete. You can connect to the "status-changed" signal on op to obtain some information about the progress of the print operation. Furthermore, it may use a recursive mainloop to show the print dialog.

If you call gtk_print_operation_set_allow_async() or set the allow-async property the operation will run asyncronously if this is supported on the platform. The "done" signal will be emitted with the operation results when the operation is done (i.e. when the dialog is canceled, or when the print succeeds or fails).

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), &data);
g_signal_connect (print, "draw-page", 
                  G_CALLBACK (draw_page), &data);
 
res = gtk_print_operation_run (print, GTK_PRINT_OPERATION_ACTION_PRINT_DIALOG, parent, &error);
 
if (res == GTK_PRINT_OPERATION_RESULT_ERROR)
 {
   error_dialog = gtk_message_dialog_new (GTK_WINDOW (parent),
  			                     GTK_DIALOG_DESTROY_WITH_PARENT,
					     GTK_MESSAGE_ERROR,
					     GTK_BUTTONS_CLOSE,
					     "Error printing file:\n%s",
					     error->message);
   g_signal_connect (error_dialog, "response", 
                     G_CALLBACK (gtk_widget_destroy), NULL);
   gtk_widget_show (error_dialog);
   g_error_free (error);
 }
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 (print));
 }

Note that gtk_print_operation_run() can only be called once on a given GtkPrintOperation.

op :

a GtkPrintOperation

action :

the action to start

parent :

Transient parent of the dialog, or NULL

error :

Return location for errors, or NULL

Returns :

the result of the print operation. A return value of GTK_PRINT_OPERATION_RESULT_APPLY indicates that the printing was completed successfully. In this case, it is a good idea to obtain the used print settings with gtk_print_operation_get_print_settings() and store them for reuse with the next print operation. A value of GTK_PRINT_OPERATION_RESULT_IN_PROGRESS means the operation is running asynchronously, and will emit the ::done signal when done.

Since 2.10


gtk_print_operation_cancel ()

void                gtk_print_operation_cancel          (GtkPrintOperation *op);

Cancels a running print operation. This function may be called from a "begin-print", "paginate" or "draw-page" signal handler to stop the currently running print operation.

Since 2.10


gtk_print_operation_get_status ()

GtkPrintStatus      gtk_print_operation_get_status      (GtkPrintOperation *op);

Returns the status of the print operation. Also see gtk_print_operation_get_status_string().

op :

a GtkPrintOperation

Returns :

the status of the print operation

Since 2.10


gtk_print_operation_get_status_string ()

const gchar*        gtk_print_operation_get_status_string
                                                        (GtkPrintOperation *op);

Returns a string representation of the status of the print operation. The string is translated and suitable for displaying the print status e.g. in a GtkStatusbar.

Use gtk_print_operation_get_status() to obtain a status value that is suitable for programmatic use.

op :

a GtkPrintOperation

Returns :

a string representation of the status of the print operation

Since 2.10


gtk_print_operation_is_finished ()

gboolean            gtk_print_operation_is_finished     (GtkPrintOperation *op);

A convenience function to find out if the print operation is finished, either successfully (GTK_PRINT_STATUS_FINISHED) or unsuccessfully (GTK_PRINT_STATUS_FINISHED_ABORTED).

Note: when you enable print status tracking the print operation can be in a non-finished state even after done has been called, as the operation status then tracks the print job status on the printer.

op :

a GtkPrintOperation

Returns :

TRUE, if the print operation is finished.

Since 2.10


gtk_print_run_page_setup_dialog ()

GtkPageSetup*       gtk_print_run_page_setup_dialog     (GtkWindow *parent,
                                                         GtkPageSetup *page_setup,
                                                         GtkPrintSettings *settings);

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.

parent :

transient parent, or NULL

page_setup :

an existing GtkPageSetup, or NULL

settings :

a GtkPrintSettings

Returns :

a new GtkPageSetup

Since 2.10


GtkPageSetupDoneFunc ()

void                (*GtkPageSetupDoneFunc)             (GtkPageSetup *page_setup,
                                                         gpointer data);

The type of function that is passed to gtk_print_run_page_setup_dialog_async(). This function will be called when the page setup dialog is dismissed, and also serves as destroy notify for data.

page_setup :

the GtkPageSetup that has been

data :

user data that has been passed to gtk_print_run_page_setup_dialog_async().

gtk_print_run_page_setup_dialog_async ()

void                gtk_print_run_page_setup_dialog_async
                                                        (GtkWindow *parent,
                                                         GtkPageSetup *page_setup,
                                                         GtkPrintSettings *settings,
                                                         GtkPageSetupDoneFunc done_cb,
                                                         gpointer data);

Runs a page setup dialog, letting the user modify the values from page_setup.

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.

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

Since 2.10


GtkPrintOperationPreview

typedef struct _GtkPrintOperationPreview GtkPrintOperationPreview;


gtk_print_operation_preview_end_preview ()

void                gtk_print_operation_preview_end_preview
                                                        (GtkPrintOperationPreview *preview);

Ends a preview.

This function must be called to finish a custom print preview.

Since 2.10


gtk_print_operation_preview_is_selected ()

gboolean            gtk_print_operation_preview_is_selected
                                                        (GtkPrintOperationPreview *preview,
                                                         gint page_nr);

Returns whether the given page is included in the set of pages that have been selected for printing.

preview :

a GtkPrintOperationPreview

page_nr :

a page number

Returns :

TRUE if the page has been selected for printing

Since 2.10


gtk_print_operation_preview_render_page ()

void                gtk_print_operation_preview_render_page
                                                        (GtkPrintOperationPreview *preview,
                                                         gint page_nr);

Renders a page to the preview, using the print context that was passed to the "preview" handler together with preview.

Note that this function requires a suitable cairo context to be associated with the print context.

preview :

a GtkPrintOperationPreview

page_nr :

the page to render

Since 2.10

Property Details

The "allow-async" property

  "allow-async"              gboolean              : Read / Write

Determines whether the print operation may run asynchronously or not.

Some systems don't support asynchronous printing, but those that do will return GTK_PRINT_OPERATION_RESULT_IN_PROGRESS as the status, and emit the done signal when the operation is actually done.

The Windows port does not support asynchronous operation at all (this is unlikely to change). On other platforms, all actions except for GTK_PRINT_OPERATION_ACTION_EXPORT support asynchronous operation.

Default value: FALSE

Since 2.10


The "current-page" property

  "current-page"             gint                  : Read / Write

The current page in the document.

If this is set before gtk_print_operation_run(), the user will be able to select to print only the current page.

Note that this only makes sense for pre-paginated documents.

Allowed values: >= -1

Default value: -1

Since 2.10


The "custom-tab-label" property

  "custom-tab-label"         gchararray            : Read / Write

Used as the label of the tab containing custom widgets. Note that this property may be ignored on some platforms.

If this is NULL, GTK+ uses a default label.

Default value: NULL

Since 2.10


The "default-page-setup" property

  "default-page-setup"       GtkPageSetup          : Read / Write

The GtkPageSetup used by default.

This page setup will be used by gtk_print_operation_run(), but it can be overridden on a per-page basis by connecting to the "request-page-setup" signal.

Since 2.10


The "export-filename" property

  "export-filename"          gchararray            : Read / Write

The name of a file file to generate instead of showing the print dialog. Currently, PDF is the only supported format.

The intended use of this property is for implementing "Export to PDF" actions.

"Print to PDF" support is independent of this and is done by letting the user pick the "Print to PDF" item from the list of printers in the print dialog.

Default value: NULL

Since 2.10


The "job-name" property

  "job-name"                 gchararray            : Read / Write

A string used to identify the job (e.g. in monitoring applications like eggcups).

If you don't set a job name, GTK+ picks a default one by numbering successive print jobs.

Default value: ""

Since 2.10


The "n-pages" property

  "n-pages"                  gint                  : Read / Write

The number of pages in the document.

This must be set to a positive number before the rendering starts. It may be set in a "begin-print" signal hander.

Note that the page numbers passed to the "request-page-setup" and "draw-page" signals are 0-based, i.e. if the user chooses to print all pages, the last ::draw-page signal will be for page n_pages - 1.

Allowed values: >= -1

Default value: -1

Since 2.10


The "print-settings" property

  "print-settings"           GtkPrintSettings      : Read / Write

The GtkPrintSettings used for initializing the dialog.

Setting this property is typically used to re-establish print settings from a previous print operation, see gtk_print_operation_run().

Since 2.10


The "show-progress" property

  "show-progress"            gboolean              : Read / Write

Determines whether to show a progress dialog during the print operation.

Default value: FALSE

Since 2.10


The "status" property

  "status"                   GtkPrintStatus        : Read

The status of the print operation.

Default value: GTK_PRINT_STATUS_INITIAL

Since 2.10


The "status-string" property

  "status-string"            gchararray            : Read

A string representation of the status of the print operation. The string is translated and suitable for displaying the print status e.g. in a GtkStatusbar.

See the ::status property for a status value that is suitable for programmatic use.

Default value: ""

Since 2.10


The "track-print-status" property

  "track-print-status"       gboolean              : Read / Write

If TRUE, the print operation will try to continue report on the status of the print job in the printer queues and printer. This can allow your application to show things like "out of paper" issues, and when the print job actually reaches the printer. However, this is often implemented using polling, and should not be enabled unless needed.

Default value: FALSE

Since 2.10


The "unit" property

  "unit"                     GtkUnit               : Read / Write

The transformation for the cairo context obtained from GtkPrintContext is set up in such a way that distances are measured in units of unit.

Default value: GTK_UNIT_PIXEL

Since 2.10


The "use-full-page" property

  "use-full-page"            gboolean              : Read / Write

If TRUE, the transformation for the cairo context obtained from GtkPrintContext puts the origin at the top left corner of the page (which may not be the top left corner of the sheet, depending on page orientation and the number of pages per sheet). Otherwise, the origin is at the top left corner of the imageable area (i.e. inside the margins).

Default value: FALSE

Since 2.10

Signal Details

The "begin-print" signal

void                user_function                      (GtkPrintOperation *operation,
                                                        GtkPrintContext   *context,
                                                        gpointer           user_data)      : Run Last

Emitted after the user has finished changing print settings in the dialog, before the actual rendering starts.

A typical use for ::begin-print is to use the parameters from the GtkPrintContext and paginate the document accordingly, and then set the number of pages with gtk_print_operation_set_n_pages().

operation :

the GtkPrintOperation on which the signal was emitted

context :

the GtkPrintContext for the current operation

user_data :

user data set when the signal handler was connected.

Since 2.10


The "create-custom-widget" signal

GObject*            user_function                      (GtkPrintOperation *operation,
                                                        gpointer           user_data)      : Run Last

Emitted when displaying the print dialog. If you return a widget in a handler for this signal it will be added to a custom tab in the print dialog. You typically return a container widget with multiple widgets in it.

The print dialog owns the returned widget, and its lifetime isn't controlled by the app. However, the widget is guaranteed to stay around until the "custom-widget-apply" signal is emitted on the operation. Then you can read out any information you need from the widgets.

operation :

the GtkPrintOperation on which the signal was emitted

user_data :

user data set when the signal handler was connected.

Returns :

A custom widget that gets embedded in the print dialog, or NULL

Since 2.10


The "custom-widget-apply" signal

void                user_function                      (GtkPrintOperation *operation,
                                                        GtkWidget         *widget,
                                                        gpointer           user_data)      : Run Last

Emitted right before "begin-print" if you added a custom widget in the "";create-custom-widget handler. When you get this signal you should read the information from the custom widgets, as the widgets are not guaraneed to be around at a later time.

operation :

the GtkPrintOperation on which the signal was emitted

widget :

the custom widget added in create-custom-widget

user_data :

user data set when the signal handler was connected.

Since 2.10


The "done" signal

void                user_function                      (GtkPrintOperation      *operation,
                                                        GtkPrintOperationResult result,
                                                        gpointer                user_data)      : Run Last

Emitted when the print operation run has finished doing everything required for printing. result gives you information about what happened during the run. If result is GTK_PRINT_OPERATION_RESULT_ERROR then you can call gtk_print_operation_get_error() for more information.

If you enabled print status tracking then gtk_print_operation_is_finished() may still return FALSE after "done" was emitted.

operation :

the GtkPrintOperation on which the signal was emitted

result :

the result of the print operation

user_data :

user data set when the signal handler was connected.

Since 2.10


The "draw-page" signal

void                user_function                      (GtkPrintOperation *operation,
                                                        GtkPrintContext   *context,
                                                        gint               page_nr,
                                                        gpointer           user_data)      : Run Last

Emitted for every page that is printed. The signal handler must render the page_nr's page onto the cairo context obtained from context using gtk_print_context_get_cairo_context().

static void
draw_page (GtkPrintOperation *operation,
           GtkPrintContext   *context,
           gint               page_nr,
           gpointer           user_data)
{
  cairo_t *cr;
  PangoLayout *layout;
  gdouble width, text_height;
  gint layout_height;
  PangoFontDescription *desc;
  
  cr = gtk_print_context_get_cairo_context (context);
  width = gtk_print_context_get_width (context);
  
  cairo_rectangle (cr, 0, 0, width, HEADER_HEIGHT);
  
  cairo_set_source_rgb (cr, 0.8, 0.8, 0.8);
  cairo_fill (cr);
  
  layout = gtk_print_context_create_pango_layout (context);
  
  desc = pango_font_description_from_string ("sans 14");
  pango_layout_set_font_description (layout, desc);
  pango_font_description_free (desc);
  
  pango_layout_set_text (layout, "some text", -1);
  pango_layout_set_width (layout, width * PANGO_SCALE);
  pango_layout_set_alignment (layout, PANGO_ALIGN_CENTER);
     		      
  pango_layout_get_size (layout, NULL, &layout_height);
  text_height = (gdouble)layout_height / PANGO_SCALE;
  
  cairo_move_to (cr, width / 2,  (HEADER_HEIGHT - text_height) / 2);
  pango_cairo_show_layout (cr, layout);
  
  g_object_unref (layout);
}

Use gtk_print_operation_set_use_full_page() and gtk_print_operation_set_unit() before starting the print operation to set up the transformation of the cairo context according to your needs.

operation :

the GtkPrintOperation on which the signal was emitted

context :

the GtkPrintContext for the current operation

page_nr :

the number of the currently printed page

user_data :

user data set when the signal handler was connected.

Since 2.10


The "end-print" signal

void                user_function                      (GtkPrintOperation *operation,
                                                        GtkPrintContext   *context,
                                                        gpointer           user_data)      : Run Last

Emitted after all pages have been rendered. A handler for this signal can clean up any resources that have been allocated in the "begin-print" handler.

operation :

the GtkPrintOperation on which the signal was emitted

context :

the GtkPrintContext for the current operation

user_data :

user data set when the signal handler was connected.

Since 2.10


The "paginate" signal

gboolean            user_function                      (GtkPrintOperation *operation,
                                                        GtkPrintContext   *context,
                                                        gpointer           user_data)      : Run Last

Emitted after the "begin-print" signal, but before the actual rendering starts. It keeps getting emitted until it returns FALSE.

The ::paginate signal is intended to be used for paginating the document in small chunks, to avoid blocking the user interface for a long time. The signal handler should update the number of pages using gtk_print_operation_set_n_pages(), and return TRUE if the document has been completely paginated.

If you don't need to do pagination in chunks, you can simply do it all in the ::begin-print handler, and set the number of pages from there.

operation :

the GtkPrintOperation on which the signal was emitted

context :

the GtkPrintContext for the current operation

user_data :

user data set when the signal handler was connected.

Returns :

TRUE if pagination is complete

Since 2.10


The "preview" signal

gboolean            user_function                      (GtkPrintOperation        *operation,
                                                        GtkPrintOperationPreview *preview,
                                                        GtkPrintContext          *context,
                                                        GtkWindow                *parent,
                                                        gpointer                  user_data)      : Run Last

Gets emitted when a preview is requested from the native dialog.

The default handler for this signal uses an external viewer application to preview.

To implement a custom print preview, an application must return TRUE from its handler for this signal. In order to use the provided context for the preview implementation, it must be given a suitable cairo context with gtk_print_context_set_cairo_context().

The custom preview implementation can use gtk_print_operation_preview_is_selected() and gtk_print_operation_preview_render_page() to find pages which are selected for print and render them. The preview must be finished by calling gtk_print_operation_preview_end_preview() (typically in response to the user clicking a close button).

operation :

the GtkPrintOperation on which the signal was emitted

preview :

the GtkPrintPreviewOperation for the current operation

context :

the GtkPrintContext that will be used

parent :

the GtkWindow to use as window parent, or NULL

user_data :

user data set when the signal handler was connected.

Returns :

TRUE if the listener wants to take over control of the preview

Since 2.10


The "request-page-setup" signal

void                user_function                      (GtkPrintOperation *operation,
                                                        GtkPrintContext   *context,
                                                        gint               page_nr,
                                                        GtkPageSetup      *setup,
                                                        gpointer           user_data)      : Run Last

Emitted once for every page that is printed, to give the application a chance to modify the page setup. Any changes done to setup will be in force only for printing this page.

operation :

the GtkPrintOperation on which the signal was emitted

context :

the GtkPrintContext for the current operation

page_nr :

the number of the currently printed page

setup :

the GtkPageSetup

user_data :

user data set when the signal handler was connected.

Since 2.10


The "status-changed" signal

void                user_function                      (GtkPrintOperation *operation,
                                                        gpointer           user_data)      : Run Last

Emitted at between the various phases of the print operation. See GtkPrintStatus for the phases that are being discriminated. Use gtk_print_operation_get_status() to find out the current status.

operation :

the GtkPrintOperation on which the signal was emitted

user_data :

user data set when the signal handler was connected.

Since 2.10

See Also

GtkPrintContext, GtkPrintUnixDialog