Source code for qpageview.printing

# -*- coding: utf-8 -*-
# This file is part of the qpageview package.
# Copyright (c) 2019 - 2019 by Wilbert Berendsen
# 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
# 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
# See for more information.

Printing facilities for qpageview.

from PyQt5.QtCore import pyqtSignal
from PyQt5.QtGui import QPainter, QTransform
from PyQt5.QtWidgets import QMessageBox, QProgressDialog

from . import backgroundjob

[docs]class PrintJob(backgroundjob.Job): """Performs a print job in the background. Emits the following signals: ``progress(pageNumber, num, total)`` before each Page ``finished()`` when done """ progress = pyqtSignal(int, int, int) aborted = False def __init__(self, printer, pageList, parent=None): """Initialize with a QPrinter object and a list of pages. pageList may be a list of two-tuples (num, page). Otherwise, the pages are numbered from 1 in the progress message. The pages are copied. """ super().__init__(parent) self.printer = printer self.setPageList(pageList)
[docs] def setPageList(self, pageList): """Set the pagelist to print. pageList may be a list of two-tuples (num, page). Otherwise, the pages are numbered from 1 in the progress message. The pages are copied. """ self.pageList = [] for n, page in enumerate(pageList, 1): if isinstance(page, tuple): pageNum, page = page else: pageNum = n page = page.copy() # set zoom to 1.0 so computations based on geometry() are # accurate enough page.updateSize(page.dpi, page.dpi, 1.0) self.pageList.append((pageNum, page))
[docs] def work(self): """Paint the pages to the printer in the background.""" p = self.printer p.setFullPage(True) painter = QPainter(p) for n, (num, page) in enumerate(self.pageList): if self.isInterruptionRequested(): self.aborted = True return p.abort() self.progress.emit(num, n+1, len(self.pageList)) if n: p.newPage() # center on the page and use scale 100% (TEMP) r = p.pageRect() m = QTransform() m.translate(, m.scale(p.logicalDpiX() / page.dpi, p.logicalDpiY() / page.dpi) m.rotate(page.rotation * 90) m.scale(page.scaleX, page.scaleY) m.translate(page.pageWidth / -2, page.pageHeight / -2) painter.setTransform(m, True) page.print(painter) painter.restore() return painter.end()
[docs]class PrintProgressDialog(QProgressDialog): """A simple progress dialog displaying the printing progress.""" def __init__(self, job, parent=None): """Initializes ourselves with the print job and optional parent widget.""" super().__init__(parent) self._job = job job.progress.connect(self.showProgress) job.finished.connect(self.jobFinished) self.canceled.connect(job.requestInterruption) self.setMinimumDuration(0) self.setRange(0, len(job.pageList)) self.setLabelText("Preparing to print...")
[docs] def showProgress(self, page, num, total): """Called by the job when printing a page.""" self.setValue(num) self.setLabelText("Printing page {page} ({num} of {total})...".format( page=page, num=num, total=total))
[docs] def jobFinished(self): """Called when the print job has finished.""" if not self._job.result and not self._job.aborted: self.showErrorMessage() del self._job self.deleteLater()
[docs] def showErrorMessage(self): """Reimplement to show a different or translated error message.""" QMessageBox.warning(self.parent(), "Printing Error", "Could not send the document to the printer.")