Source code for qpageview.shadow

# -*- 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
# 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
# See http://www.gnu.org/licenses/ for more information.

"""
A View mixin class that draws a nice drop shadow around all pages.
"""

from PyQt5.QtCore import QPoint, Qt
from PyQt5.QtGui import QColor, QPainter, QPen


[docs]class ShadowViewMixin: """Mixin class that draws a drop shadow around every Page. Drawing the drop shadow can be turned off by setting dropShadowEnabled to False. """ dropShadowEnabled = True
[docs] def paintEvent(self, ev): if self.dropShadowEnabled: width = self._pageLayout.spacing / 2 # make the rect slightly larger, so we "see" shadow of pages that # would be outside view normally. rect = ev.rect().adjusted(-width, -width, width / 2, width / 2) painter = QPainter(self.viewport()) for page, rect in self.pagesToPaint(rect, painter): self.drawDropShadow(page, painter, width) super().paintEvent(ev) # then draw the contents
[docs] def drawDropShadow(self, page, painter, width): """Draw a drop shadow of width pixels around the Page. The painter is already translated to the topleft corner of the Page. """ width = round(width) rect = page.rect().adjusted(width / 2, width / 2, 0, 0) color = QColor(Qt.black) pen = QPen() pen.setWidth(1) pen.setJoinStyle(Qt.MiterJoin) for i in range(width): f = (width-i)/width color.setAlpha(200**f + 55*f) pen.setColor(color) painter.setPen(pen) painter.drawRect(rect.adjusted(-i, -i, i, i))