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c++-gtk-utils
file_print_manager.h
Go to the documentation of this file.
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/* Copyright (C) 2006 to 2011 Chris Vine
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The library comprised in this file or of which this file is part is
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distributed by Chris Vine under the GNU Lesser General Public
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License as follows:
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License
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as published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License, version 2.1, for more details.
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You should have received a copy of the GNU Lesser General Public
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License, version 2.1, along with this library (see the file LGPL.TXT
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which came with this source code package in the c++-gtk-utils
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sub-directory); if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef CGU_FILE_PRINTMANAGER_H
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#define CGU_FILE_PRINTMANAGER_H
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#include <string>
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#include <gtk/gtk.h>
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#include <gdk/gdk.h>
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#if GTK_CHECK_VERSION(2,14,0)
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#include <gtk/gtkunixprint.h>
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#else
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#include <gtk/gtkprintunixdialog.h>
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#include <gtk/gtkprintjob.h>
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#include <gtk/gtkprinter.h>
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#endif
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#include <
c++-gtk-utils/window.h
>
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#include <
c++-gtk-utils/notifier.h
>
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#include <
c++-gtk-utils/mutex.h
>
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#include <
c++-gtk-utils/gobj_handle.h
>
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#include <
c++-gtk-utils/intrusive_ptr.h
>
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#include <
c++-gtk-utils/emitter.h
>
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#include <
c++-gtk-utils/cgu_config.h
>
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namespace
Cgu {
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/**
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* @class FilePrintDialog file_print_manager.h c++-gtk-utils/file_print_manager.h
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* @brief A print dialog class for FilePrintManager.
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* @sa FilePrintManager
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*/
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class
FilePrintDialog
:
public
WinBase
{
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protected
:
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/**
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* Closes the dialog, cleans up and emits the rejected Emitter object.
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* It will not throw, even if a method connected to the rejected
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* Emitter object throws (the exception is caught and reported in
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* order to prevent it trying to propagate through the GTK+ event
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* system).
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*/
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virtual
void
on_delete_event
();
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public
:
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#ifndef DOXYGEN_PARSING
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// this helper class avoids exposing GObject callbacks with C
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// linkage to the global namespace
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class
CB;
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friend
class
CB;
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#endif
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/**
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* The accepted Emitter object emits if the user choses OK in the
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* print dialog. Emission of accepted by this class will not throw,
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* even if a method connected to the accepted Emitter object throws
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* (the exception is caught and reported in order to prevent it trying
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* to propagate through the GTK+ event system).
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*/
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Emitter
accepted
;
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/**
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* The rejected Emitter object emits if the user choses Cancel in the
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* print dialog. Emission of rejected by this class will not throw,
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* even if a method connected to the rejected Emitter object throws
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* (the exception is caught and reported in order to prevent it trying
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* to propagate through the GTK+ event system).
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*/
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Emitter
rejected
;
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/**
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* Gets the currently selected printer from the print dialog. It will
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* not throw. It must be called in the thread in which the main GTK+
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* event loop runs.
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* @return The currently selected printer in the print dialog. The
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* return value is owned by GTK+ - do not unreference it.
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*/
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GtkPrinter*
get_printer
()
const
;
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/**
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* Gets the print settings from the print dialog. It will not throw.
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* It must be called in the thread in which the main GTK+ event loop
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* runs.
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* @return The currently selected printer in the print dialog.
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* Ownership is taken of the return value, by GobjHandle.
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*/
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GobjHandle<GtkPrintSettings>
get_settings
()
const
;
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/**
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* Gets the printer page set-up from the print dialog. It will not
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* throw. It must be called in the thread in which the main GTK+
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* event loop runs.
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* @return The printer page set-up in the print dialog. The return
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* value is owned by GTK+ - do not unreference it.
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*/
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GtkPageSetup*
get_page_setup
()
const
;
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/**
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* The constructor will not throw. A FIlePrintDialog object must be
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* created in the thread in which the main GTK+ event loop runs.
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* @param parent The parent of the print dialog (NULL may be passed).
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* @param print_settings The print settings from a previous print job
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* (if any, NULL may be passed if none).
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* @param caption Window caption (optional, NULL may be passed).
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* @param window_icon A pixbuf which will comprise the window icon
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* (optional, NULL may be passed).
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*/
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FilePrintDialog
(GtkWindow* parent, GtkPrintSettings* print_settings = 0,
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const
char
* caption = 0, GdkPixbuf* window_icon = 0);
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/* we inherit glib memory slice functions from WinBase */
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};
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/**
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* @class FilePrintManager file_print_manager.h c++-gtk-utils/file_print_manager.h
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* @brief A class to print a file using the GTK+ print system.
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*
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* The FilePrintManager class prints a file printable by the print
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* system (eg lpr or CUPS) using the GTK+ printer interface. All
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* print systems on Unix-like systems will print Postscript (PS)
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* files. Some may also print PDF files. To obtain a
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* FilePrintManager object, call FilePrintManager::create_manager().
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* FilePrintManager::set_filename() passes the name of the file to be
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* printed. To print the file, call FilePrintManager::print(). If
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* FilePrintManager::print() returns true, the FilePrintManager class
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* will unlink() (ie delete) the file to be printed when it has been
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* finished with if true is passed as the second argument of
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* FilePrintManager::set_filename(), even if printing failed.
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*
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* Once FilePrintManager::print() has been called, the
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* FilePrintManager class owns a reference to itself and so manages
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* its own lifetime - so once that method has been called it doesn't
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* matter if the IntrusivePtr object returned by
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* FilePrintManager::create_manager() goes out of scope (however, once
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* FilePrintManager::print() has been called, the FilePrintManager
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* object will not be deleted until both printing has completed or
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* failed AND the IntrusivePtr object returned by
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* FilePrintManager::create_manager() has gone out of scope or has
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* been reset()).
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*
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* If the print dialog which is displayed on calling
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* FilePrintManager::print() is to display a window icon, then pass
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* FilePrintManager::create_manager() a GobjHandle<GdkPixbuf> icon as
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* the second argument.
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*
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* Normally, a user would probably only want to use any one
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* FilePrintManager object to print a single print job (it has been
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* designed with that in mind). Nevertheless, if a reference to the
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* object is kept alive via an active IntrusivePtr object, it can be
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* used to print more than one print job. However, if that is done it
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* is not possible to call FilePrintManager::print() or
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* FilePrintManager::set_filename() until the previous print job (if
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* any) has been dispatched to the GTK+ print system (or cancelled).
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* If the FilePrintManager object is not ready because it is in the
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* middle of handling an earlier print job, then the call to
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* FilePrintManager::print() or FilePrintManager::set_filename() will
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* return false; if however the new print job was successfully started
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* or file name successfully set, they will return true. It is not
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* necessary to check the return value of these methods for the first
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* print job despatched by any one FilePrintManager object.
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*
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* For printing plain text (say, from a GtkTextBuffer class, or from a
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* plain text file), see the TextPrintManager class.
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*/
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class
FilePrintManager
:
public
IntrusiveLockCounter
{
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Thread::Mutex
mutex;
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GtkWindow* parent_p;
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std::string caption;
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GobjHandle<GdkPixbuf>
window_icon_h;
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bool
manage;
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std::string filename;
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FilePrintDialog
* dialog_p;
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Notifier
print_notifier;
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bool
ready;
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static
GobjHandle<GtkPrintSettings>
print_settings_h;
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void
show_dialog();
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void
print_file();
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void
print_cancel();
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void
clean_up();
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// private constructor
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FilePrintManager
() {}
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public
:
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#ifndef DOXYGEN_PARSING
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// this helper class avoids exposing GObject callbacks with C
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// linkage to the global namespace
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class
CB;
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friend
class
CB;
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#endif
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/**
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* This class cannot be copied: it is intended to be held by
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* IntrusivePtr. The copy constructor is deleted.
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*/
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FilePrintManager
(
const
FilePrintManager
&) =
delete
;
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/**
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* This class cannot be copied: it is intended to be held by
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* IntrusivePtr. The assignment operator is deleted.
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*/
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FilePrintManager
&
operator=
(
const
FilePrintManager
&) =
delete
;
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/**
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* Creates a new FilePrintManager object. No GTK+/GDK functions are
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* called by this method, and it is thread safe provided that, if it
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* is called in a thread other than the one in which the GTK+ event
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* loop runs, Cgu::Notifier::init() has previously been called in the
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* GTK+ event loop thread.
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* @param parent The parent of the print dialog which will be created
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* by the FilePrintManager object (optional, NULL may be passed).
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* @param caption Window caption of the print dialog which will be
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* created by the FilePrintManager object (optional, an empty string
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* may be passed).
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* @param window_icon A pixbuf which will comprise the window icon of
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* the print dialog which will be created by the FilePrintManager
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* object (optional, an empty GobjHandle object may be passed).
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* @exception std::bad_alloc This method might throw std::bad_alloc if
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* memory is exhausted and the system throws in that case.
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* @exception Cgu::Thread::MutexError This method might throw
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* Cgu::Thread::MutexError if initialisation of the contained mutex
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* fails. (It is often not worth checking for this, as it means
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* either memory is exhausted or pthread has run out of other
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* resources to create new mutexes.)
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* @exception Cgu::PipeError This method might throw Cgu::PipeError if
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* the contained Notifier object is the first Notifier object in the
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* program to be constructed and Cgu::Notifier::init() has not
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* previously been called.
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*/
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static
Cgu::IntrusivePtr<Cgu::FilePrintManager>
create_manager
(GtkWindow* parent = 0,
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const
std::string& caption =
""
,
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const
GobjHandle<GdkPixbuf>
& window_icon =
GobjHandle<GdkPixbuf>
(0));
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/**
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* Sets the filename of the file to be printed. This method is
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* thread-safe and may be called in any thread. No GTK+/GDK functions
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* are called.
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* @param filename The filename of the file to be printed.
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* @param manage_file If this argument is set to true, then if print()
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* returns true, after printing succeeds or fails the file being
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* printed will be deleted.
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* @return Returns true, unless the same FilePrintManager object is
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* being used to print more than one print job and when this method is
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* called it is already printing another print job (in which case it
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* returns false).
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* @exception std::bad_alloc This method might throw std::bad_alloc if
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* memory is exhausted and the system throws in that case.
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*/
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bool
set_filename
(
const
char
* filename,
bool
manage_file =
false
);
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/**
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* Prints the file set with set_filename(). This method is
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* thread-safe and may be called in any thread (it hands off its work
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* to the main program thread via a Cgu::Notifier object), unless the
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* program by which it is called calls GTK+ directly in more than one
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* thread and thus employs gdk_threads_enter()/gdk_threads_leave()
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* (rather than, say, Cgu::Notifier or Cgu::Callback::post()), in
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* which case it must be called in the main GUI thread only and
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* surrounded by gdk_threads_enter()/gdk_threads_leave() if called
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* otherwise than in a GTK+ signal handler. (The best approach
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* however is for a program only to address GTK+/GDK in the main
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* program thread, for which purpose this library provides various
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* functions and classes for inter-thread communication, such as
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* Cgu::Notifier and Cgu::Callback::post().)
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* @return Returns true, unless the same FilePrintManager object is
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* being used to print more than one print job and when this method is
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* called it is already printing another print job (in which case it
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* returns false).
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* @exception std::bad_alloc This method might throw std::bad_alloc if
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* memory is exhausted and the system throws in that case, but only if
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* it is called in the main program thread. Otherwise it will not
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* throw.
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*/
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bool
print
();
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/**
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* The destructor will not throw. It is thread safe (the
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* FilePrintManager object may be destroyed in any thread), and does
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* not call any GTK+/GDK functions.
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*/
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~FilePrintManager
();
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#ifdef CGU_USE_GLIB_MEMORY_SLICES_NO_COMPAT
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CGU_GLIB_MEMORY_SLICES_FUNCS
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#endif
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};
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}
// namespace Cgu
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#endif // CGU_FILE_PRINTMANAGER_H
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