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# -*- 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
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
def paintEvent(self, ev):
if self.dropShadowEnabled:
width = round(self._pageLayout.spacing / 2.0)
# 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
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(int(200**f + 55*f))
pen.setColor(color)
painter.setPen(pen)
painter.drawRect(rect.adjusted(-i, -i, i, i))
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