kopia lustrzana https://github.com/ctjacobs/pyqso
133 wiersze
5.3 KiB
Python
133 wiersze
5.3 KiB
Python
#!/usr/bin/env python3
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# Copyright (C) 2017 Christian Thomas Jacobs.
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# This file is part of PyQSO.
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# PyQSO is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# PyQSO is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with PyQSO. If not, see <http://www.gnu.org/licenses/>.
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from gi.repository import Gtk, Pango, PangoCairo
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import logging
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from pyqso.auxiliary_dialogs import error
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class Printer(object):
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""" Handles the printing of one or more records to file or paper. """
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def __init__(self, application):
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""" Initialise the record printer.
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:arg application: The PyQSO application containing the main Gtk window, etc.
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"""
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self.application = application
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self.action = Gtk.PrintOperationAction.PRINT_DIALOG
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self.operation = Gtk.PrintOperation()
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ps = Gtk.PageSetup()
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ps.set_orientation(Gtk.PageOrientation.LANDSCAPE)
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self.operation.set_default_page_setup(ps)
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self.operation.set_unit(Gtk.Unit.MM)
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self.operation.connect("begin_print", self.begin_print)
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self.operation.connect("draw_page", self.draw_page)
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return
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def print_records(self, records, title=None):
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""" Perform the print operation.
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:arg dict records: The records to be printed.
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:arg str title: Optional title for the document. Default is None.
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:returns: The result of the print operation.
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:rtype: Gtk.PrintOperationResult
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"""
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# Add the title, if given.
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if(title):
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self.text_to_print = title + "\n\n"
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else:
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self.text_to_print = ""
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# Assemble the header and records into one string.
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line_format = "%-5s\t%-15s\t%-8s\t%-6s\t%-15s\t%-12s\t%-8s\t%-8s\n"
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self.text_to_print += line_format % ("Index", "Callsign", "Date", "Time", "Frequency", "Mode", "RST Sent", "RST Rcvd")
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self.text_to_print += line_format % ("-----", "--------", "----", "----", "---------", "----", "--------", "--------")
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for r in records:
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self.text_to_print += line_format % (str(r["id"]), str(r["CALL"]), str(r["QSO_DATE"]), str(r["TIME_ON"]), str(r["FREQ"]), str(r["MODE"]), str(r["RST_SENT"]), str(r["RST_RCVD"]))
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result = self.operation.run(self.action, parent=self.application.window)
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if(result == Gtk.PrintOperationResult.ERROR):
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error(parent=self.application.window, message="Unable to print the log.")
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return result
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def begin_print(self, operation, context):
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""" Specify the layout/position/font of the text on the pages to be printed.
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:arg Gtk.PrintOperation operation: The printing API.
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:arg Gtk.PrintContext context: Used to draw/render the pages to print.
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"""
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width = context.get_width() # Measured in pixels.
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height = context.get_height() # Measured in pixels.
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layout = context.create_pango_layout()
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layout.set_font_description(Pango.FontDescription("monospace expanded 10"))
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layout.set_width(int(width*Pango.SCALE))
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layout.set_text(self.text_to_print, -1)
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number_of_pages = 1
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page_height = 0
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for line in range(0, layout.get_line_count()):
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layout_line = layout.get_line(line)
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ink_rectangle, logical_rectangle = layout_line.get_pixel_extents()
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self.line_height = logical_rectangle.height + 3.0
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page_height += self.line_height
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if((page_height + 2*self.line_height) >= height):
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# Go on to the next page.
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number_of_pages += 1
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page_height = 0.0
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operation.set_n_pages(number_of_pages)
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logging.debug("Printing %d pages..." % number_of_pages)
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self.text_to_print = self.text_to_print.split("\n")
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return
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def draw_page(self, operation, context, page_number):
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""" Render the QSO details on the page.
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:arg Gtk.PrintOperation operation: The printing API.
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:arg Gtk.PrintContext context: Used to draw/render the pages to print.
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:arg int page_number: The current page number.
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"""
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cr = context.get_cairo_context()
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cr.set_source_rgb(0, 0, 0)
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layout = context.create_pango_layout()
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layout.set_font_description(Pango.FontDescription("monospace expanded 10"))
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layout.set_width(int(context.get_width()*Pango.SCALE))
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current_line_number = 1
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for line in self.text_to_print:
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layout.set_text(line, -1)
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cr.move_to(5, current_line_number*self.line_height)
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PangoCairo.update_layout(cr, layout)
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PangoCairo.show_layout(cr, layout)
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current_line_number += 1
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if((current_line_number+1)*self.line_height >= context.get_height()):
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for j in range(0, current_line_number-1):
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self.text_to_print.pop(0) # Remove what has been printed already before draw_page is called again.
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break
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return
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