gramps/src/plugins/docgen/GtkPrint.py

#
# Gramps - a GTK+/GNOME based genealogy program
#
# Copyright (C) 2007       Zsolt Foldvari
# Copyright (C) 2008-2009  Brian G. Matherly
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

# $Id$

"""Printing interface based on gtk.Print* classes.
"""

#------------------------------------------------------------------------
#
# Python modules
#
#------------------------------------------------------------------------
from gettext import gettext as _
from math import radians

##try:
    ##from cStringIO import StringIO
##except:
    ##from StringIO import StringIO

#------------------------------------------------------------------------
#
# Gramps modules
#
#------------------------------------------------------------------------
from gen.plug.docgen.basedoc import PAPER_PORTRAIT
import libcairodoc
from gen.plug import PluginManager, DocGenPlugin
import Errors
from glade import Glade

#------------------------------------------------------------------------
#
# Set up logging
#
#------------------------------------------------------------------------
import logging
log = logging.getLogger(".GtkPrint")

#-------------------------------------------------------------------------
#
# GTK modules
#
#-------------------------------------------------------------------------
import gtk
import cairo

if gtk.pygtk_version < (2, 10, 0):
    raise Errors.UnavailableError(_("PyGtk 2.10 or later is required"))

#------------------------------------------------------------------------
#
# Constants
#
#------------------------------------------------------------------------

# printer settings (might be needed to align for different platforms)
PRINTER_DPI = 72.0
PRINTER_SCALE = 1.0

# the print settings to remember between print sessions
PRINT_SETTINGS = None

# minimum spacing around a page in print preview
MARGIN = 6

# zoom modes in print preview
(ZOOM_BEST_FIT,
 ZOOM_FIT_WIDTH,
 ZOOM_FREE,) = range(3)
 
#------------------------------------------------------------------------
#
# Converter functions
#
#------------------------------------------------------------------------

def paperstyle_to_pagesetup(paper_style):
    """Convert a PaperStyle instance into a gtk.PageSetup instance.
    
    @param paper_style: Gramps paper style object to convert
    @param type: PaperStyle
    @return: page_setup
    @rtype: gtk.PageSetup
    """
    # paper size names according to 'PWG Candidate Standard 5101.1-2002'
    # ftp://ftp.pwg.org/pub/pwg/candidates/cs-pwgmsn10-20020226-5101.1.pdf
    gramps_to_gtk = {
        "Letter": "na_letter",
        "Legal": "na_legal",
        "A0": "iso_a0",
        "A1": "iso_a1",
        "A2": "iso_a2",
        "A3": "iso_a3",
        "A4": "iso_a4",
        "A5": "iso_a5",
        "B0": "iso_b0",
        "B1": "iso_b1",
        "B2": "iso_b2",
        "B3": "iso_b3",
        "B4": "iso_b4",
        "B5": "iso_b5",
        "B6": "iso_b6",
        "B": "na_ledger",
        "C": "na_c",
        "D": "na_d",
        "E": "na_e",
    }

    # First set the paper size
    gramps_paper_size = paper_style.get_size()
    gramps_paper_name = gramps_paper_size.get_name()
    
    # All sizes not included in the translation table (even if a standard size)
    # are handled as custom format, because we are not intelligent enough.
    if gramps_paper_name in gramps_to_gtk:
        paper_size = gtk.PaperSize(gramps_to_gtk[gramps_paper_name])
        log.debug("Selected paper size: %s" % gramps_to_gtk[gramps_paper_name])
    else:
        paper_width = gramps_paper_size.get_width() * 10
        paper_height = gramps_paper_size.get_height() * 10
        paper_size = gtk.paper_size_new_custom("custom",
                                               "Custom Size",
                                               paper_width,
                                               paper_height,
                                               gtk.UNIT_MM)
        log.debug("Selected paper size: (%f,%f)" % (paper_width, paper_height))
        
    page_setup = gtk.PageSetup()
    page_setup.set_paper_size(paper_size)
    
    # Set paper orientation
    if paper_style.get_orientation() == PAPER_PORTRAIT:
        page_setup.set_orientation(gtk.PAGE_ORIENTATION_PORTRAIT)
    else:
        page_setup.set_orientation(gtk.PAGE_ORIENTATION_LANDSCAPE)

    # Set paper margins
    page_setup.set_top_margin(paper_style.get_top_margin() * 10,
                              gtk.UNIT_MM)
    page_setup.set_bottom_margin(paper_style.get_bottom_margin() * 10,
                                 gtk.UNIT_MM)
    page_setup.set_left_margin(paper_style.get_left_margin() * 10,
                               gtk.UNIT_MM)
    page_setup.set_right_margin(paper_style.get_right_margin() * 10,
                                gtk.UNIT_MM)
    
    return page_setup

#------------------------------------------------------------------------
#
# PrintPreview class
#
#------------------------------------------------------------------------
class PrintPreview(object):
    """Implement a dialog to show print preview.
    """
    zoom_factors = {
        0.50: '50%',
        0.75: '75%',
        1.00: '100%',
        1.25: '125%',
        1.50: '150%',
        1.75: '175%',
        2.00: '200%',
        3.00: '300%',
        4.00: '400%',
    }
    
    def __init__(self, operation, preview, context, parent):
        self._operation = operation
        self._preview = preview
        self._context = context
        
        self.__build_window()
        self._current_page = None

    # Private
    
    def __build_window(self):
        """Build the window from Glade.
        """

        glade_xml = Glade()
        self._window = glade_xml.toplevel
        #self._window.set_transient_for(parent)
 
        # remember active widgets for future use
        self._swin = glade_xml.get_object('swin')
        self._drawing_area = glade_xml.get_object('drawingarea')
        self._first_button = glade_xml.get_object('first')
        self._prev_button = glade_xml.get_object('prev')
        self._next_button = glade_xml.get_object('next')
        self._last_button = glade_xml.get_object('last')
        self._pages_entry = glade_xml.get_object('entry')
        self._pages_label = glade_xml.get_object('label')
        self._zoom_fit_width_button = glade_xml.get_object('zoom_fit_width')
        self._zoom_fit_width_button.set_stock_id('gramps-zoom-fit-width')
        self._zoom_best_fit_button = glade_xml.get_object('zoom_best_fit')
        self._zoom_best_fit_button.set_stock_id('gramps-zoom-best-fit')
        self._zoom_in_button = glade_xml.get_object('zoom_in')
        self._zoom_in_button.set_stock_id('gramps-zoom-in')
        self._zoom_out_button = glade_xml.get_object('zoom_out')
        self._zoom_out_button.set_stock_id('gramps-zoom-out')

        # connect the signals
        glade_xml.connect_signals(self)

    ##def create_surface(self):
        ##return cairo.PDFSurface(StringIO(),
                                ##self._context.get_width(),
                                ##self._context.get_height())
    
    ##def get_page(self, page_no):
        ##"""Get the cairo surface of the given page.
        
        ##Surfaces are also cached for instant access.
        
        ##"""
        ##if page_no >= len(self._page_numbers):
            ##log.debug("Page number %d doesn't exist." % page_no)
            ##page_no = 0
        
        ##if page_no not in self._page_surfaces:
            ##surface = self.create_surface()
            ##cr = cairo.Context(surface)
            
            ##if PRINTER_SCALE != 1.0:
                ##cr.scale(PRINTER_SCALE, PRINTER_SCALE)
                
            ##self._context.set_cairo_context(cr, PRINTER_DPI, PRINTER_DPI)
            ##self._preview.render_page(self._page_numbers[page_no])
            
            ##self._page_surfaces[page_no] = surface
            
        ##return self._page_surfaces[page_no]
    
    def __set_page(self, page_no):
        if page_no < 0 or page_no >= self._page_no:
            return
        
        if self._current_page != page_no:
            self._drawing_area.queue_draw()
        
        self._current_page = page_no

        self._first_button.set_sensitive(self._current_page)
        self._prev_button.set_sensitive(self._current_page)
        self._next_button.set_sensitive(self._current_page < self._page_no - 1)
        self._last_button.set_sensitive(self._current_page < self._page_no - 1)
        
        self._pages_entry.set_text('%d' % (self._current_page + 1))
        
    def __set_zoom(self, zoom):
        self._zoom = zoom

        screen_width = int(self._paper_width * self._zoom + 2 * MARGIN)
        screen_height = int(self._paper_height * self._zoom + 2 * MARGIN)
        self._drawing_area.set_size_request(screen_width, screen_height)
        self._drawing_area.queue_draw()
        
        self._zoom_in_button.set_sensitive(self._zoom !=
                                           max(self.zoom_factors))
        self._zoom_out_button.set_sensitive(self._zoom !=
                                            min(self.zoom_factors))
        
    def __zoom_in(self):
        zoom = [z for z in self.zoom_factors if z > self._zoom]

        if zoom:
            return min(zoom)
        else:
            return self._zoom
            
    def __zoom_out(self):
        zoom = [z for z in self.zoom_factors if z < self._zoom]
        
        if zoom:
            return max(zoom)
        else:
            return self._zoom

    def __zoom_fit_width(self):
        width, height, vsb_w, hsb_h = self.__get_view_size()

        zoom = width / self._paper_width
        if self._paper_height * zoom > height:
            zoom = (width - vsb_w) / self._paper_width

        return zoom

    def __zoom_best_fit(self):
        width, height, vsb_w, hsb_h = self.__get_view_size()

        zoom = min(width / self._paper_width, height / self._paper_height)

        return zoom
        
    def __get_view_size(self):
        """Get the dimensions of the scrolled window.
        """
        width = self._swin.allocation.width - 2 * MARGIN
        height = self._swin.allocation.height - 2 * MARGIN

        if self._swin.get_shadow_type() != gtk.SHADOW_NONE:
            width -= 2 * self._swin.style.xthickness
            height -= 2 * self._swin.style.ythickness

        spacing = self._swin.style_get_property('scrollbar-spacing')
        
        vsb_w, vsb_h = self._swin.get_vscrollbar().size_request()
        vsb_w += spacing
        
        hsb_w, hsb_h = self._swin.get_hscrollbar().size_request()
        hsb_h += spacing
        
        return width, height, vsb_w, hsb_h
        
    def __end_preview(self):
        self._operation.end_preview()
        
    # Signal handlers
    
    def on_drawingarea_expose_event(self, drawing_area, event):
        cr = drawing_area.window.cairo_create()
        cr.rectangle(event.area)
        cr.clip()
        
        # get the extents of the page and the screen
        paper_w = int(self._paper_width * self._zoom)
        paper_h = int(self._paper_height * self._zoom)

        width, height, vsb_w, hsb_h = self.__get_view_size()
        if paper_h > height:
            width -= vsb_w
        if paper_w > width:
            height -= hsb_h
        
        # put the paper on the middle of the window
        xtranslate = MARGIN
        if  paper_w < width:
            xtranslate += (width - paper_w) / 2
            
        ytranslate = MARGIN
        if  paper_h < height:
            ytranslate += (height - paper_h) / 2
            
        cr.translate(xtranslate, ytranslate)
        
        # draw an empty white page
        cr.set_source_rgb(1.0, 1.0, 1.0)
        cr.rectangle(0, 0, paper_w, paper_h)
        cr.fill_preserve()
        cr.set_source_rgb(0, 0, 0)
        cr.set_line_width(1)
        cr.stroke()
        
        if self._orientation == gtk.PAGE_ORIENTATION_LANDSCAPE:
            cr.rotate(radians(-90))
            cr.translate(-paper_h, 0)
            
        ##page_setup = self._context.get_page_setup()
        ##cr.translate(page_setup.get_left_margin(gtk.UNIT_POINTS),
                     ##page_setup.get_top_margin(gtk.UNIT_POINTS))
        
        ##cr.set_source_surface(self.get_page(0))
        ##cr.paint()
        
        # draw the content of the currently selected page
        #     Here we use dpi scaling instead of scaling the cairo context,
        #     because it gives better result. In the latter case the distance
        #     of glyphs was changing.
        dpi = PRINTER_DPI * self._zoom
        self._context.set_cairo_context(cr, dpi, dpi)
        self._preview.render_page(self._current_page)
    
    def on_swin_size_allocate(self, scrolledwindow, allocation):
        if self._zoom_mode == ZOOM_FIT_WIDTH:
            self.__set_zoom(self.__zoom_fit_width())
        
        if self._zoom_mode == ZOOM_BEST_FIT:
            self.__set_zoom(self.__zoom_best_fit())

    def on_print_clicked(self, toolbutton):
        pass
    
    def on_first_clicked(self, toolbutton):
        self.__set_page(0)
    
    def on_prev_clicked(self, toolbutton):
        self.__set_page(self._current_page - 1)
    
    def on_next_clicked(self, toolbutton):
        self.__set_page(self._current_page + 1)
    
    def on_last_clicked(self, toolbutton):
        self.__set_page(self._page_no - 1)
    
    def on_entry_activate(self, entry):
        try:
            new_page = int(entry.get_text()) - 1
        except ValueError:
            new_page = self._current_page
        
        if new_page < 0 or new_page >= self._page_no:
            new_page = self._current_page
            
        self.__set_page(new_page)
        
    def on_zoom_fit_width_toggled(self, toggletoolbutton):
        if toggletoolbutton.get_active():
            self._zoom_best_fit_button.set_active(False)
            self._zoom_mode = ZOOM_FIT_WIDTH
            self.__set_zoom(self.__zoom_fit_width())
        else:
            self._zoom_mode = ZOOM_FREE
        
    def on_zoom_best_fit_toggled(self, toggletoolbutton):
        if toggletoolbutton.get_active():
            self._zoom_fit_width_button.set_active(False)
            self._zoom_mode = ZOOM_BEST_FIT
            self.__set_zoom(self.__zoom_best_fit())
        else:
            self._zoom_mode = ZOOM_FREE

    def on_zoom_in_clicked(self, toolbutton):
        self._zoom_fit_width_button.set_active(False)
        self._zoom_best_fit_button.set_active(False)
        self._zoom_mode = ZOOM_FREE
        self.__set_zoom(self.__zoom_in())
    
    def on_zoom_out_clicked(self, toolbutton):
        self._zoom_fit_width_button.set_active(False)
        self._zoom_best_fit_button.set_active(False)
        self._zoom_mode = ZOOM_FREE
        self.__set_zoom(self.__zoom_out())
        
    def on_window_delete_event(self, widget, event):
        self.__end_preview()
        return False

    def on_quit_clicked(self, toolbutton):
        self.__end_preview()
        self._window.destroy()

    # Public

    def start(self):
        # get paper/page dimensions
        page_setup = self._context.get_page_setup()
        self._paper_width = page_setup.get_paper_width(gtk.UNIT_POINTS)
        self._paper_height = page_setup.get_paper_height(gtk.UNIT_POINTS)
        self._page_width = page_setup.get_page_width(gtk.UNIT_POINTS)
        self._page_height = page_setup.get_page_height(gtk.UNIT_POINTS)
        self._orientation = page_setup.get_orientation()

        # get the total number of pages
        ##self._page_numbers = [0,]
        ##self._page_surfaces = {}
        self._page_no = self._operation.get_property('n_pages')
        self._pages_label.set_text(_('of %d') % self._page_no)

        # set zoom level and initial page number
        self._zoom_mode = ZOOM_FREE
        self.__set_zoom(1.0)
        self.__set_page(0)
        
        # let's the show begin...
        self._window.show()
    
#------------------------------------------------------------------------
#
# GtkPrint class
#
#------------------------------------------------------------------------
class GtkPrint(libcairodoc.CairoDoc):
    """Print document via GtkPrint* interface.
    
    Requires Gtk+ 2.10.
    
    """
    def run(self):
        """Run the Gtk Print operation.
        """
        global PRINT_SETTINGS

        # get a page setup from the paper style we have
        page_setup = paperstyle_to_pagesetup(self.paper)
        
        # set up a print operation
        operation = gtk.PrintOperation()
        operation.set_default_page_setup(page_setup)
        operation.connect("begin_print", self.on_begin_print)
        operation.connect("draw_page", self.on_draw_page)
        operation.connect("paginate", self.on_paginate)
        operation.connect("preview", self.on_preview)

        # set print settings if it was stored previously
        if PRINT_SETTINGS is not None:
            operation.set_print_settings(PRINT_SETTINGS)

        # run print dialog
        while True:
            self.preview = None
            res = operation.run(gtk.PRINT_OPERATION_ACTION_PRINT_DIALOG)
            if self.preview is None: # cancel or print
                break
            # set up printing again; can't reuse PrintOperation?
            operation = gtk.PrintOperation()
            operation.set_default_page_setup(page_setup)
            operation.connect("begin_print", self.on_begin_print)
            operation.connect("draw_page", self.on_draw_page)
            operation.connect("paginate", self.on_paginate)
            operation.connect("preview", self.on_preview)
            # set print settings if it was stored previously
            if PRINT_SETTINGS is not None:
                operation.set_print_settings(PRINT_SETTINGS)
        
        # store print settings if printing was successful
        if res == gtk.PRINT_OPERATION_RESULT_APPLY:
            PRINT_SETTINGS = operation.get_print_settings()

    def on_begin_print(self, operation, context):
        """Setup environment for printing.
        """
        # get data from context here only once to save time on pagination
        self.page_width = round(context.get_width())
        self.page_height = round(context.get_height())
        self.dpi_x = context.get_dpi_x()
        self.dpi_y = context.get_dpi_y()
        
    def on_paginate(self, operation, context):
        """Paginate the whole document in chunks.
        """
        layout = context.create_pango_layout()

        finished = self.paginate(layout,
                                 self.page_width,
                                 self.page_height,
                                 self.dpi_x,
                                 self.dpi_y)
        # update page number
        operation.set_n_pages(len(self._pages))
        
        # start preview if needed
        if finished and self.preview:
            self.preview.start()
            
        return finished

    def on_draw_page(self, operation, context, page_nr):
        """Draw the requested page.
        """
        cr = context.get_cairo_context()
        layout = context.create_pango_layout()
        width = round(context.get_width())
        height = round(context.get_height())
        dpi_x = context.get_dpi_x()
        dpi_y = context.get_dpi_y()

        self.draw_page(page_nr, cr, layout, width, height, dpi_x, dpi_y)
        
    def on_preview(self, operation, preview, context, parent):
        """Implement custom print preview functionality.
        """
        ##if os.sys.platform == 'win32':
            ##return False
            
        self.preview = PrintPreview(operation, preview, context, parent)
        
        # give a dummy cairo context to gtk.PrintContext,
        # PrintPreview will update it with the real one
        try:
            width = int(round(context.get_width()))
        except ValueError:
            width = 0
        try:
            height = int(round(context.get_height()))
        except ValueError:
            height = 0
        surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
        cr = cairo.Context(surface)
        context.set_cairo_context(cr, PRINTER_DPI, PRINTER_DPI)
        
        return True

#------------------------------------------------------------------------
#
# register_plugin
#
#------------------------------------------------------------------------
def register_plugin():
    """
    Register the document generator with the GRAMPS plugin system
    """
    pmgr = PluginManager.get_instance()
    plugin = DocGenPlugin(name        = _('Print...'), 
                          description = _("Generates documents and prints them "
                                          "directly."),
                          basedoc     = GtkPrint,
                          paper       = True,
                          style       = True, 
                          extension   = "" )
    pmgr.register_plugin(plugin)
    
register_plugin()